[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini less implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2005 by Rob Sullivan <cogito.ergo.cogito@gmail.com>
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| 6 | *
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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 8 | */
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| 9 |
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| 10 | /*
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[1765] | 11 | * TODO:
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| 12 | * - Add more regular expression support - search modifiers, certain matches, etc.
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| 13 | * - Add more complex bracket searching - currently, nested brackets are
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| 14 | * not considered.
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| 15 | * - Add support for "F" as an input. This causes less to act in
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| 16 | * a similar way to tail -f.
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| 17 | * - Allow horizontal scrolling.
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[821] | 18 | *
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[1765] | 19 | * Notes:
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| 20 | * - the inp file pointer is used so that keyboard input works after
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| 21 | * redirected input has been read from stdin
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| 22 | */
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[821] | 23 |
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[3232] | 24 | //config:config LESS
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| 25 | //config: bool "less"
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| 26 | //config: default y
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| 27 | //config: help
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| 28 | //config: 'less' is a pager, meaning that it displays text files. It possesses
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| 29 | //config: a wide array of features, and is an improvement over 'more'.
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| 30 | //config:
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| 31 | //config:config FEATURE_LESS_MAXLINES
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| 32 | //config: int "Max number of input lines less will try to eat"
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| 33 | //config: default 9999999
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| 34 | //config: depends on LESS
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| 35 | //config:
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| 36 | //config:config FEATURE_LESS_BRACKETS
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| 37 | //config: bool "Enable bracket searching"
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| 38 | //config: default y
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| 39 | //config: depends on LESS
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| 40 | //config: help
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| 41 | //config: This option adds the capability to search for matching left and right
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| 42 | //config: brackets, facilitating programming.
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| 43 | //config:
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| 44 | //config:config FEATURE_LESS_FLAGS
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| 45 | //config: bool "Enable -m/-M"
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| 46 | //config: default y
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| 47 | //config: depends on LESS
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| 48 | //config: help
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| 49 | //config: The -M/-m flag enables a more sophisticated status line.
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| 50 | //config:
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[3621] | 51 | //config:config FEATURE_LESS_TRUNCATE
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| 52 | //config: bool "Enable -S"
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| 53 | //config: default y
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| 54 | //config: depends on LESS
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| 55 | //config: help
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| 56 | //config: The -S flag causes long lines to be truncated rather than
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| 57 | //config: wrapped.
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| 58 | //config:
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[3232] | 59 | //config:config FEATURE_LESS_MARKS
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| 60 | //config: bool "Enable marks"
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| 61 | //config: default y
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| 62 | //config: depends on LESS
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| 63 | //config: help
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| 64 | //config: Marks enable positions in a file to be stored for easy reference.
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| 65 | //config:
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| 66 | //config:config FEATURE_LESS_REGEXP
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| 67 | //config: bool "Enable regular expressions"
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| 68 | //config: default y
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| 69 | //config: depends on LESS
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| 70 | //config: help
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| 71 | //config: Enable regular expressions, allowing complex file searches.
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| 72 | //config:
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| 73 | //config:config FEATURE_LESS_WINCH
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| 74 | //config: bool "Enable automatic resizing on window size changes"
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| 75 | //config: default y
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| 76 | //config: depends on LESS
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| 77 | //config: help
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| 78 | //config: Makes less track window size changes.
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| 79 | //config:
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| 80 | //config:config FEATURE_LESS_ASK_TERMINAL
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| 81 | //config: bool "Use 'tell me cursor position' ESC sequence to measure window"
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| 82 | //config: default y
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| 83 | //config: depends on FEATURE_LESS_WINCH
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| 84 | //config: help
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| 85 | //config: Makes less track window size changes.
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| 86 | //config: If terminal size can't be retrieved and $LINES/$COLUMNS are not set,
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| 87 | //config: this option makes less perform a last-ditch effort to find it:
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| 88 | //config: position cursor to 999,999 and ask terminal to report real
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| 89 | //config: cursor position using "ESC [ 6 n" escape sequence, then read stdin.
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| 90 | //config:
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| 91 | //config: This is not clean but helps a lot on serial lines and such.
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| 92 | //config:
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| 93 | //config:config FEATURE_LESS_DASHCMD
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| 94 | //config: bool "Enable flag changes ('-' command)"
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| 95 | //config: default y
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| 96 | //config: depends on LESS
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| 97 | //config: help
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| 98 | //config: This enables the ability to change command-line flags within
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| 99 | //config: less itself ('-' keyboard command).
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| 100 | //config:
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| 101 | //config:config FEATURE_LESS_LINENUMS
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| 102 | //config: bool "Enable dynamic switching of line numbers"
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| 103 | //config: default y
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| 104 | //config: depends on FEATURE_LESS_DASHCMD
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| 105 | //config: help
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| 106 | //config: Enables "-N" command.
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| 107 |
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| 108 | //usage:#define less_trivial_usage
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[3621] | 109 | //usage: "[-E" IF_FEATURE_LESS_REGEXP("I")IF_FEATURE_LESS_FLAGS("Mm")
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| 110 | //usage: "N" IF_FEATURE_LESS_TRUNCATE("S") "h~] [FILE]..."
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[3232] | 111 | //usage:#define less_full_usage "\n\n"
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| 112 | //usage: "View FILE (or stdin) one screenful at a time\n"
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| 113 | //usage: "\n -E Quit once the end of a file is reached"
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[3621] | 114 | //usage: IF_FEATURE_LESS_REGEXP(
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| 115 | //usage: "\n -I Ignore case in all searches"
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| 116 | //usage: )
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[3232] | 117 | //usage: IF_FEATURE_LESS_FLAGS(
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| 118 | //usage: "\n -M,-m Display status line with line numbers"
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| 119 | //usage: "\n and percentage through the file"
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| 120 | //usage: )
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| 121 | //usage: "\n -N Prefix line number to each line"
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[3621] | 122 | //usage: IF_FEATURE_LESS_TRUNCATE(
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| 123 | //usage: "\n -S Truncate long lines"
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| 124 | //usage: )
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[3232] | 125 | //usage: "\n -~ Suppress ~s displayed past EOF"
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| 126 |
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[2725] | 127 | #include <sched.h> /* sched_yield() */
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[821] | 128 |
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[1765] | 129 | #include "libbb.h"
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[3621] | 130 | #include "common_bufsiz.h"
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[1765] | 131 | #if ENABLE_FEATURE_LESS_REGEXP
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[821] | 132 | #include "xregex.h"
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| 133 | #endif
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| 134 |
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| 135 |
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[2725] | 136 | #define ESC "\033"
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[821] | 137 | /* The escape codes for highlighted and normal text */
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[2725] | 138 | #define HIGHLIGHT ESC"[7m"
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| 139 | #define NORMAL ESC"[0m"
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| 140 | /* The escape code to home and clear to the end of screen */
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| 141 | #define CLEAR ESC"[H\033[J"
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| 142 | /* The escape code to clear to the end of line */
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| 143 | #define CLEAR_2_EOL ESC"[K"
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[821] | 144 |
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[1765] | 145 | enum {
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| 146 | /* Absolute max of lines eaten */
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| 147 | MAXLINES = CONFIG_FEATURE_LESS_MAXLINES,
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| 148 | /* This many "after the end" lines we will show (at max) */
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| 149 | TILDES = 1,
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| 150 | };
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| 151 |
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[821] | 152 | /* Command line options */
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[1765] | 153 | enum {
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[2725] | 154 | FLAG_E = 1 << 0,
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[1765] | 155 | FLAG_M = 1 << 1,
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| 156 | FLAG_m = 1 << 2,
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| 157 | FLAG_N = 1 << 3,
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| 158 | FLAG_TILDE = 1 << 4,
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[2725] | 159 | FLAG_I = 1 << 5,
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[3621] | 160 | FLAG_S = (1 << 6) * ENABLE_FEATURE_LESS_TRUNCATE,
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[1765] | 161 | /* hijack command line options variable for internal state vars */
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| 162 | LESS_STATE_MATCH_BACKWARDS = 1 << 15,
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| 163 | };
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[821] | 164 |
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[1765] | 165 | #if !ENABLE_FEATURE_LESS_REGEXP
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| 166 | enum { pattern_valid = 0 };
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[821] | 167 | #endif
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| 168 |
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[1765] | 169 | struct globals {
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| 170 | int cur_fline; /* signed */
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| 171 | int kbd_fd; /* fd to get input from */
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[2725] | 172 | int less_gets_pos;
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[1765] | 173 | /* last position in last line, taking into account tabs */
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[2725] | 174 | size_t last_line_pos;
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[1765] | 175 | unsigned max_fline;
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| 176 | unsigned max_lineno; /* this one tracks linewrap */
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[2725] | 177 | unsigned max_displayed_line;
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[1765] | 178 | unsigned width;
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[2725] | 179 | #if ENABLE_FEATURE_LESS_WINCH
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| 180 | unsigned winch_counter;
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| 181 | #endif
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[1765] | 182 | ssize_t eof_error; /* eof if 0, error if < 0 */
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[2725] | 183 | ssize_t readpos;
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| 184 | ssize_t readeof; /* must be signed */
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[1765] | 185 | const char **buffer;
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| 186 | const char **flines;
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| 187 | const char *empty_line_marker;
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| 188 | unsigned num_files;
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| 189 | unsigned current_file;
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| 190 | char *filename;
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| 191 | char **files;
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[3621] | 192 | #if ENABLE_FEATURE_LESS_FLAGS
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| 193 | int num_lines; /* a flag if < 0, line count if >= 0 */
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| 194 | # define REOPEN_AND_COUNT (-1)
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| 195 | # define REOPEN_STDIN (-2)
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| 196 | # define NOT_REGULAR_FILE (-3)
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| 197 | #endif
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[1765] | 198 | #if ENABLE_FEATURE_LESS_MARKS
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| 199 | unsigned num_marks;
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| 200 | unsigned mark_lines[15][2];
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[821] | 201 | #endif
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[1765] | 202 | #if ENABLE_FEATURE_LESS_REGEXP
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| 203 | unsigned *match_lines;
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| 204 | int match_pos; /* signed! */
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[2725] | 205 | int wanted_match; /* signed! */
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| 206 | int num_matches;
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[1765] | 207 | regex_t pattern;
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| 208 | smallint pattern_valid;
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| 209 | #endif
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[3232] | 210 | #if ENABLE_FEATURE_LESS_ASK_TERMINAL
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| 211 | smallint winsize_err;
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| 212 | #endif
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[1765] | 213 | smallint terminated;
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| 214 | struct termios term_orig, term_less;
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[2725] | 215 | char kbd_input[KEYCODE_BUFFER_SIZE];
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[1765] | 216 | };
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| 217 | #define G (*ptr_to_globals)
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| 218 | #define cur_fline (G.cur_fline )
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| 219 | #define kbd_fd (G.kbd_fd )
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[2725] | 220 | #define less_gets_pos (G.less_gets_pos )
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| 221 | #define last_line_pos (G.last_line_pos )
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[1765] | 222 | #define max_fline (G.max_fline )
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| 223 | #define max_lineno (G.max_lineno )
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[2725] | 224 | #define max_displayed_line (G.max_displayed_line)
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[1765] | 225 | #define width (G.width )
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[2725] | 226 | #define winch_counter (G.winch_counter )
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| 227 | /* This one is 100% not cached by compiler on read access */
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| 228 | #define WINCH_COUNTER (*(volatile unsigned *)&winch_counter)
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[1765] | 229 | #define eof_error (G.eof_error )
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| 230 | #define readpos (G.readpos )
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| 231 | #define readeof (G.readeof )
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| 232 | #define buffer (G.buffer )
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| 233 | #define flines (G.flines )
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| 234 | #define empty_line_marker (G.empty_line_marker )
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| 235 | #define num_files (G.num_files )
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| 236 | #define current_file (G.current_file )
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| 237 | #define filename (G.filename )
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| 238 | #define files (G.files )
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[3621] | 239 | #define num_lines (G.num_lines )
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[1765] | 240 | #define num_marks (G.num_marks )
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| 241 | #define mark_lines (G.mark_lines )
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| 242 | #if ENABLE_FEATURE_LESS_REGEXP
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| 243 | #define match_lines (G.match_lines )
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| 244 | #define match_pos (G.match_pos )
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| 245 | #define num_matches (G.num_matches )
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[2725] | 246 | #define wanted_match (G.wanted_match )
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[1765] | 247 | #define pattern (G.pattern )
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| 248 | #define pattern_valid (G.pattern_valid )
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| 249 | #endif
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| 250 | #define terminated (G.terminated )
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| 251 | #define term_orig (G.term_orig )
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| 252 | #define term_less (G.term_less )
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[2725] | 253 | #define kbd_input (G.kbd_input )
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[1765] | 254 | #define INIT_G() do { \
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[2725] | 255 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 256 | less_gets_pos = -1; \
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| 257 | empty_line_marker = "~"; \
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| 258 | num_files = 1; \
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| 259 | current_file = 1; \
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| 260 | eof_error = 1; \
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| 261 | terminated = 1; \
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| 262 | IF_FEATURE_LESS_REGEXP(wanted_match = -1;) \
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| 263 | } while (0)
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[821] | 264 |
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[2725] | 265 | /* flines[] are lines read from stdin, each in malloc'ed buffer.
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| 266 | * Line numbers are stored as uint32_t prepended to each line.
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| 267 | * Pointer is adjusted so that flines[i] points directly past
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| 268 | * line number. Accesor: */
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| 269 | #define MEMPTR(p) ((char*)(p) - 4)
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| 270 | #define LINENO(p) (*(uint32_t*)((p) - 4))
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| 271 |
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| 272 |
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[821] | 273 | /* Reset terminal input to normal */
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| 274 | static void set_tty_cooked(void)
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| 275 | {
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[2725] | 276 | fflush_all();
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[1765] | 277 | tcsetattr(kbd_fd, TCSANOW, &term_orig);
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[821] | 278 | }
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| 279 |
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| 280 | /* Move the cursor to a position (x,y), where (0,0) is the
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| 281 | top-left corner of the console */
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[1765] | 282 | static void move_cursor(int line, int row)
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[821] | 283 | {
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[2725] | 284 | printf(ESC"[%u;%uH", line, row);
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[821] | 285 | }
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| 286 |
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| 287 | static void clear_line(void)
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| 288 | {
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[2725] | 289 | printf(ESC"[%u;0H" CLEAR_2_EOL, max_displayed_line + 2);
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[821] | 290 | }
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| 291 |
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[1765] | 292 | static void print_hilite(const char *str)
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[821] | 293 | {
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[1765] | 294 | printf(HIGHLIGHT"%s"NORMAL, str);
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| 295 | }
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[821] | 296 |
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[1765] | 297 | static void print_statusline(const char *str)
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| 298 | {
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| 299 | clear_line();
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| 300 | printf(HIGHLIGHT"%.*s"NORMAL, width - 1, str);
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[821] | 301 | }
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| 302 |
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[2725] | 303 | /* Exit the program gracefully */
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| 304 | static void less_exit(int code)
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| 305 | {
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| 306 | set_tty_cooked();
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| 307 | clear_line();
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| 308 | if (code < 0)
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| 309 | kill_myself_with_sig(- code); /* does not return */
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| 310 | exit(code);
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| 311 | }
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| 312 |
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| 313 | #if (ENABLE_FEATURE_LESS_DASHCMD && ENABLE_FEATURE_LESS_LINENUMS) \
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| 314 | || ENABLE_FEATURE_LESS_WINCH
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| 315 | static void re_wrap(void)
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| 316 | {
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| 317 | int w = width;
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| 318 | int new_line_pos;
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| 319 | int src_idx;
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| 320 | int dst_idx;
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| 321 | int new_cur_fline = 0;
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| 322 | uint32_t lineno;
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| 323 | char linebuf[w + 1];
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| 324 | const char **old_flines = flines;
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| 325 | const char *s;
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| 326 | char **new_flines = NULL;
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| 327 | char *d;
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| 328 |
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| 329 | if (option_mask32 & FLAG_N)
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| 330 | w -= 8;
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| 331 |
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| 332 | src_idx = 0;
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| 333 | dst_idx = 0;
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| 334 | s = old_flines[0];
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| 335 | lineno = LINENO(s);
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| 336 | d = linebuf;
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| 337 | new_line_pos = 0;
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| 338 | while (1) {
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| 339 | *d = *s;
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| 340 | if (*d != '\0') {
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| 341 | new_line_pos++;
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[3621] | 342 | if (*d == '\t') { /* tab */
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[2725] | 343 | new_line_pos += 7;
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[3621] | 344 | new_line_pos &= (~7);
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| 345 | }
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[2725] | 346 | s++;
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| 347 | d++;
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| 348 | if (new_line_pos >= w) {
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| 349 | int sz;
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| 350 | /* new line is full, create next one */
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| 351 | *d = '\0';
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| 352 | next_new:
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| 353 | sz = (d - linebuf) + 1; /* + 1: NUL */
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| 354 | d = ((char*)xmalloc(sz + 4)) + 4;
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| 355 | LINENO(d) = lineno;
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| 356 | memcpy(d, linebuf, sz);
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| 357 | new_flines = xrealloc_vector(new_flines, 8, dst_idx);
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| 358 | new_flines[dst_idx] = d;
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| 359 | dst_idx++;
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| 360 | if (new_line_pos < w) {
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| 361 | /* if we came here thru "goto next_new" */
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| 362 | if (src_idx > max_fline)
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| 363 | break;
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| 364 | lineno = LINENO(s);
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| 365 | }
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| 366 | d = linebuf;
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| 367 | new_line_pos = 0;
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| 368 | }
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| 369 | continue;
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| 370 | }
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| 371 | /* *d == NUL: old line ended, go to next old one */
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| 372 | free(MEMPTR(old_flines[src_idx]));
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| 373 | /* btw, convert cur_fline... */
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| 374 | if (cur_fline == src_idx)
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| 375 | new_cur_fline = dst_idx;
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| 376 | src_idx++;
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| 377 | /* no more lines? finish last new line (and exit the loop) */
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| 378 | if (src_idx > max_fline)
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| 379 | goto next_new;
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| 380 | s = old_flines[src_idx];
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| 381 | if (lineno != LINENO(s)) {
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| 382 | /* this is not a continuation line!
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| 383 | * create next _new_ line too */
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| 384 | goto next_new;
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| 385 | }
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| 386 | }
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| 387 |
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| 388 | free(old_flines);
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| 389 | flines = (const char **)new_flines;
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| 390 |
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| 391 | max_fline = dst_idx - 1;
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| 392 | last_line_pos = new_line_pos;
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| 393 | cur_fline = new_cur_fline;
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| 394 | /* max_lineno is screen-size independent */
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[1765] | 395 | #if ENABLE_FEATURE_LESS_REGEXP
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[2725] | 396 | pattern_valid = 0;
|
---|
| 397 | #endif
|
---|
| 398 | }
|
---|
| 399 | #endif
|
---|
| 400 |
|
---|
| 401 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
[1765] | 402 | static void fill_match_lines(unsigned pos);
|
---|
| 403 | #else
|
---|
| 404 | #define fill_match_lines(pos) ((void)0)
|
---|
| 405 | #endif
|
---|
| 406 |
|
---|
[3621] | 407 | static int at_end(void)
|
---|
| 408 | {
|
---|
| 409 | return (option_mask32 & FLAG_S)
|
---|
| 410 | ? !(cur_fline <= max_fline &&
|
---|
| 411 | max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
|
---|
| 412 | : !(max_fline > cur_fline + max_displayed_line);
|
---|
| 413 | }
|
---|
| 414 |
|
---|
[1765] | 415 | /* Devilishly complex routine.
|
---|
| 416 | *
|
---|
| 417 | * Has to deal with EOF and EPIPE on input,
|
---|
| 418 | * with line wrapping, with last line not ending in '\n'
|
---|
| 419 | * (possibly not ending YET!), with backspace and tabs.
|
---|
| 420 | * It reads input again if last time we got an EOF (thus supporting
|
---|
| 421 | * growing files) or EPIPE (watching output of slow process like make).
|
---|
| 422 | *
|
---|
| 423 | * Variables used:
|
---|
| 424 | * flines[] - array of lines already read. Linewrap may cause
|
---|
| 425 | * one source file line to occupy several flines[n].
|
---|
| 426 | * flines[max_fline] - last line, possibly incomplete.
|
---|
| 427 | * terminated - 1 if flines[max_fline] is 'terminated'
|
---|
| 428 | * (if there was '\n' [which isn't stored itself, we just remember
|
---|
| 429 | * that it was seen])
|
---|
| 430 | * max_lineno - last line's number, this one doesn't increment
|
---|
| 431 | * on line wrap, only on "real" new lines.
|
---|
| 432 | * readbuf[0..readeof-1] - small preliminary buffer.
|
---|
| 433 | * readbuf[readpos] - next character to add to current line.
|
---|
[2725] | 434 | * last_line_pos - screen line position of next char to be read
|
---|
[1765] | 435 | * (takes into account tabs and backspaces)
|
---|
| 436 | * eof_error - < 0 error, == 0 EOF, > 0 not EOF/error
|
---|
[3621] | 437 | *
|
---|
| 438 | * "git log -p | less -m" on the kernel git tree is a good test for EAGAINs,
|
---|
| 439 | * "/search on very long input" and "reaching max line count" corner cases.
|
---|
[1765] | 440 | */
|
---|
| 441 | static void read_lines(void)
|
---|
[821] | 442 | {
|
---|
[1765] | 443 | char *current_line, *p;
|
---|
| 444 | int w = width;
|
---|
| 445 | char last_terminated = terminated;
|
---|
[3621] | 446 | time_t last_time = 0;
|
---|
| 447 | int retry_EAGAIN = 2;
|
---|
[2725] | 448 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 449 | unsigned old_max_fline = max_fline;
|
---|
| 450 | #endif
|
---|
[821] | 451 |
|
---|
[3621] | 452 | #define readbuf bb_common_bufsiz1
|
---|
| 453 | setup_common_bufsiz();
|
---|
| 454 |
|
---|
| 455 | /* (careful: max_fline can be -1) */
|
---|
| 456 | if (max_fline + 1 > MAXLINES)
|
---|
| 457 | return;
|
---|
| 458 |
|
---|
[1765] | 459 | if (option_mask32 & FLAG_N)
|
---|
| 460 | w -= 8;
|
---|
| 461 |
|
---|
[3621] | 462 | p = current_line = ((char*)xmalloc(w + 5)) + 4;
|
---|
[1765] | 463 | if (!last_terminated) {
|
---|
| 464 | const char *cp = flines[max_fline];
|
---|
[3621] | 465 | p = stpcpy(p, cp);
|
---|
| 466 | free(MEMPTR(cp));
|
---|
[2725] | 467 | /* last_line_pos is still valid from previous read_lines() */
|
---|
[1765] | 468 | } else {
|
---|
[3621] | 469 | max_fline++;
|
---|
[2725] | 470 | last_line_pos = 0;
|
---|
[821] | 471 | }
|
---|
| 472 |
|
---|
[2725] | 473 | while (1) { /* read lines until we reach cur_fline or wanted_match */
|
---|
[1765] | 474 | *p = '\0';
|
---|
| 475 | terminated = 0;
|
---|
[2725] | 476 | while (1) { /* read chars until we have a line */
|
---|
[1765] | 477 | char c;
|
---|
| 478 | /* if no unprocessed chars left, eat more */
|
---|
| 479 | if (readpos >= readeof) {
|
---|
[3621] | 480 | int flags = ndelay_on(0);
|
---|
| 481 |
|
---|
| 482 | while (1) {
|
---|
| 483 | time_t t;
|
---|
| 484 |
|
---|
| 485 | errno = 0;
|
---|
| 486 | eof_error = safe_read(STDIN_FILENO, readbuf, COMMON_BUFSIZE);
|
---|
| 487 | if (errno != EAGAIN)
|
---|
| 488 | break;
|
---|
| 489 | t = time(NULL);
|
---|
| 490 | if (t != last_time) {
|
---|
| 491 | last_time = t;
|
---|
| 492 | if (--retry_EAGAIN < 0)
|
---|
| 493 | break;
|
---|
| 494 | }
|
---|
| 495 | sched_yield();
|
---|
| 496 | }
|
---|
| 497 | fcntl(0, F_SETFL, flags); /* ndelay_off(0) */
|
---|
[1765] | 498 | readpos = 0;
|
---|
| 499 | readeof = eof_error;
|
---|
[2725] | 500 | if (eof_error <= 0)
|
---|
[1765] | 501 | goto reached_eof;
|
---|
[3621] | 502 | retry_EAGAIN = 1;
|
---|
[1765] | 503 | }
|
---|
| 504 | c = readbuf[readpos];
|
---|
| 505 | /* backspace? [needed for manpages] */
|
---|
| 506 | /* <tab><bs> is (a) insane and */
|
---|
| 507 | /* (b) harder to do correctly, so we refuse to do it */
|
---|
[2725] | 508 | if (c == '\x8' && last_line_pos && p[-1] != '\t') {
|
---|
[1765] | 509 | readpos++; /* eat it */
|
---|
[2725] | 510 | last_line_pos--;
|
---|
[1765] | 511 | /* was buggy (p could end up <= current_line)... */
|
---|
| 512 | *--p = '\0';
|
---|
| 513 | continue;
|
---|
| 514 | }
|
---|
| 515 | {
|
---|
[2725] | 516 | size_t new_last_line_pos = last_line_pos + 1;
|
---|
[1765] | 517 | if (c == '\t') {
|
---|
[2725] | 518 | new_last_line_pos += 7;
|
---|
| 519 | new_last_line_pos &= (~7);
|
---|
[1765] | 520 | }
|
---|
[3621] | 521 | if ((int)new_last_line_pos > w)
|
---|
[1765] | 522 | break;
|
---|
[2725] | 523 | last_line_pos = new_last_line_pos;
|
---|
[1765] | 524 | }
|
---|
| 525 | /* ok, we will eat this char */
|
---|
| 526 | readpos++;
|
---|
| 527 | if (c == '\n') {
|
---|
| 528 | terminated = 1;
|
---|
[2725] | 529 | last_line_pos = 0;
|
---|
[1765] | 530 | break;
|
---|
| 531 | }
|
---|
| 532 | /* NUL is substituted by '\n'! */
|
---|
| 533 | if (c == '\0') c = '\n';
|
---|
| 534 | *p++ = c;
|
---|
| 535 | *p = '\0';
|
---|
[2725] | 536 | } /* end of "read chars until we have a line" loop */
|
---|
[3621] | 537 | #if 0
|
---|
| 538 | //BUG: also triggers on this:
|
---|
| 539 | // { printf "\nfoo\n"; sleep 1; printf "\nbar\n"; } | less
|
---|
| 540 | // (resulting in lost empty line between "foo" and "bar" lines)
|
---|
| 541 | // the "terminated" logic needs fixing (or explaining)
|
---|
[1765] | 542 | /* Corner case: linewrap with only "" wrapping to next line */
|
---|
| 543 | /* Looks ugly on screen, so we do not store this empty line */
|
---|
| 544 | if (!last_terminated && !current_line[0]) {
|
---|
| 545 | last_terminated = 1;
|
---|
| 546 | max_lineno++;
|
---|
[2725] | 547 | continue;
|
---|
[1765] | 548 | }
|
---|
[3621] | 549 | #endif
|
---|
[1765] | 550 | reached_eof:
|
---|
| 551 | last_terminated = terminated;
|
---|
[2725] | 552 | flines = xrealloc_vector(flines, 8, max_fline);
|
---|
| 553 |
|
---|
| 554 | flines[max_fline] = (char*)xrealloc(MEMPTR(current_line), strlen(current_line) + 1 + 4) + 4;
|
---|
| 555 | LINENO(flines[max_fline]) = max_lineno;
|
---|
| 556 | if (terminated)
|
---|
| 557 | max_lineno++;
|
---|
| 558 |
|
---|
[1765] | 559 | if (max_fline >= MAXLINES) {
|
---|
| 560 | eof_error = 0; /* Pretend we saw EOF */
|
---|
| 561 | break;
|
---|
| 562 | }
|
---|
[3621] | 563 | if (!at_end()) {
|
---|
[2725] | 564 | #if !ENABLE_FEATURE_LESS_REGEXP
|
---|
[1765] | 565 | break;
|
---|
[2725] | 566 | #else
|
---|
| 567 | if (wanted_match >= num_matches) { /* goto_match called us */
|
---|
| 568 | fill_match_lines(old_max_fline);
|
---|
| 569 | old_max_fline = max_fline;
|
---|
| 570 | }
|
---|
| 571 | if (wanted_match < num_matches)
|
---|
| 572 | break;
|
---|
| 573 | #endif
|
---|
| 574 | }
|
---|
[1765] | 575 | if (eof_error <= 0) {
|
---|
| 576 | break;
|
---|
| 577 | }
|
---|
| 578 | max_fline++;
|
---|
[3621] | 579 | current_line = ((char*)xmalloc(w + 5)) + 4;
|
---|
[1765] | 580 | p = current_line;
|
---|
[2725] | 581 | last_line_pos = 0;
|
---|
| 582 | } /* end of "read lines until we reach cur_fline" loop */
|
---|
[3621] | 583 |
|
---|
| 584 | if (eof_error < 0) {
|
---|
| 585 | if (errno == EAGAIN) {
|
---|
| 586 | eof_error = 1;
|
---|
| 587 | } else {
|
---|
| 588 | print_statusline(bb_msg_read_error);
|
---|
| 589 | }
|
---|
| 590 | }
|
---|
| 591 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 592 | else if (eof_error == 0)
|
---|
| 593 | num_lines = max_lineno;
|
---|
| 594 | #endif
|
---|
| 595 |
|
---|
[1765] | 596 | fill_match_lines(old_max_fline);
|
---|
[2725] | 597 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 598 | /* prevent us from being stuck in search for a match */
|
---|
| 599 | wanted_match = -1;
|
---|
| 600 | #endif
|
---|
[1765] | 601 | #undef readbuf
|
---|
[821] | 602 | }
|
---|
| 603 |
|
---|
[1765] | 604 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
[3621] | 605 | static int safe_lineno(int fline)
|
---|
[821] | 606 | {
|
---|
[3621] | 607 | if (fline >= max_fline)
|
---|
| 608 | fline = max_fline - 1;
|
---|
| 609 |
|
---|
| 610 | /* also catches empty file (max_fline == 0) */
|
---|
| 611 | if (fline < 0)
|
---|
| 612 | return 0;
|
---|
| 613 |
|
---|
| 614 | return LINENO(flines[fline]) + 1;
|
---|
[821] | 615 | }
|
---|
| 616 |
|
---|
[3621] | 617 | /* count number of lines in file */
|
---|
| 618 | static void update_num_lines(void)
|
---|
| 619 | {
|
---|
| 620 | int count, fd;
|
---|
| 621 | struct stat stbuf;
|
---|
| 622 | ssize_t len, i;
|
---|
| 623 | char buf[4096];
|
---|
| 624 |
|
---|
| 625 | /* only do this for regular files */
|
---|
| 626 | if (num_lines == REOPEN_AND_COUNT || num_lines == REOPEN_STDIN) {
|
---|
| 627 | count = 0;
|
---|
| 628 | fd = open("/proc/self/fd/0", O_RDONLY);
|
---|
| 629 | if (fd < 0 && num_lines == REOPEN_AND_COUNT) {
|
---|
| 630 | /* "filename" is valid only if REOPEN_AND_COUNT */
|
---|
| 631 | fd = open(filename, O_RDONLY);
|
---|
| 632 | }
|
---|
| 633 | if (fd < 0) {
|
---|
| 634 | /* somebody stole my file! */
|
---|
| 635 | num_lines = NOT_REGULAR_FILE;
|
---|
| 636 | return;
|
---|
| 637 | }
|
---|
| 638 | if (fstat(fd, &stbuf) != 0 || !S_ISREG(stbuf.st_mode)) {
|
---|
| 639 | num_lines = NOT_REGULAR_FILE;
|
---|
| 640 | goto do_close;
|
---|
| 641 | }
|
---|
| 642 | while ((len = safe_read(fd, buf, sizeof(buf))) > 0) {
|
---|
| 643 | for (i = 0; i < len; ++i) {
|
---|
| 644 | if (buf[i] == '\n' && ++count == MAXLINES)
|
---|
| 645 | goto done;
|
---|
| 646 | }
|
---|
| 647 | }
|
---|
| 648 | done:
|
---|
| 649 | num_lines = count;
|
---|
| 650 | do_close:
|
---|
| 651 | close(fd);
|
---|
| 652 | }
|
---|
| 653 | }
|
---|
| 654 |
|
---|
[821] | 655 | /* Print a status line if -M was specified */
|
---|
| 656 | static void m_status_print(void)
|
---|
| 657 | {
|
---|
[3621] | 658 | int first, last;
|
---|
| 659 | unsigned percent;
|
---|
[821] | 660 |
|
---|
[2725] | 661 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
| 662 | return;
|
---|
| 663 |
|
---|
[1765] | 664 | clear_line();
|
---|
| 665 | printf(HIGHLIGHT"%s", filename);
|
---|
| 666 | if (num_files > 1)
|
---|
| 667 | printf(" (file %i of %i)", current_file, num_files);
|
---|
[3621] | 668 |
|
---|
| 669 | first = safe_lineno(cur_fline);
|
---|
| 670 | last = (option_mask32 & FLAG_S)
|
---|
| 671 | ? MIN(first + max_displayed_line, max_lineno)
|
---|
| 672 | : safe_lineno(cur_fline + max_displayed_line);
|
---|
| 673 | printf(" lines %i-%i", first, last);
|
---|
| 674 |
|
---|
| 675 | update_num_lines();
|
---|
| 676 | if (num_lines >= 0)
|
---|
| 677 | printf("/%i", num_lines);
|
---|
| 678 |
|
---|
| 679 | if (at_end()) {
|
---|
| 680 | printf(" (END)");
|
---|
[1765] | 681 | if (num_files > 1 && current_file != num_files)
|
---|
[3621] | 682 | printf(" - next: %s", files[current_file]);
|
---|
| 683 | } else if (num_lines > 0) {
|
---|
| 684 | percent = (100 * last + num_lines/2) / num_lines;
|
---|
| 685 | printf(" %i%%", percent <= 100 ? percent : 100);
|
---|
[821] | 686 | }
|
---|
[3621] | 687 | printf(NORMAL);
|
---|
[821] | 688 | }
|
---|
| 689 | #endif
|
---|
| 690 |
|
---|
| 691 | /* Print the status line */
|
---|
| 692 | static void status_print(void)
|
---|
| 693 | {
|
---|
[1765] | 694 | const char *p;
|
---|
| 695 |
|
---|
[2725] | 696 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
| 697 | return;
|
---|
| 698 |
|
---|
[821] | 699 | /* Change the status if flags have been set */
|
---|
[1765] | 700 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 701 | if (option_mask32 & (FLAG_M|FLAG_m)) {
|
---|
[821] | 702 | m_status_print();
|
---|
[1765] | 703 | return;
|
---|
| 704 | }
|
---|
[821] | 705 | /* No flags set */
|
---|
| 706 | #endif
|
---|
[1765] | 707 |
|
---|
| 708 | clear_line();
|
---|
[3621] | 709 | if (cur_fline && !at_end()) {
|
---|
[2725] | 710 | bb_putchar(':');
|
---|
[1765] | 711 | return;
|
---|
| 712 | }
|
---|
| 713 | p = "(END)";
|
---|
| 714 | if (!cur_fline)
|
---|
| 715 | p = filename;
|
---|
| 716 | if (num_files > 1) {
|
---|
| 717 | printf(HIGHLIGHT"%s (file %i of %i)"NORMAL,
|
---|
| 718 | p, current_file, num_files);
|
---|
| 719 | return;
|
---|
| 720 | }
|
---|
| 721 | print_hilite(p);
|
---|
| 722 | }
|
---|
| 723 |
|
---|
| 724 | static const char controls[] ALIGN1 =
|
---|
| 725 | /* NUL: never encountered; TAB: not converted */
|
---|
| 726 | /**/"\x01\x02\x03\x04\x05\x06\x07\x08" "\x0a\x0b\x0c\x0d\x0e\x0f"
|
---|
| 727 | "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
|
---|
| 728 | "\x7f\x9b"; /* DEL and infamous Meta-ESC :( */
|
---|
| 729 | static const char ctrlconv[] ALIGN1 =
|
---|
[2725] | 730 | /* why 40 instead of 4a below? - it is a replacement for '\n'.
|
---|
| 731 | * '\n' is a former NUL - we subst it with @, not J */
|
---|
[1765] | 732 | "\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x40\x4b\x4c\x4d\x4e\x4f"
|
---|
| 733 | "\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f";
|
---|
| 734 |
|
---|
[3621] | 735 | static void print_lineno(const char *line)
|
---|
[2725] | 736 | {
|
---|
[3621] | 737 | const char *fmt = " ";
|
---|
| 738 | unsigned n = n; /* for compiler */
|
---|
[2725] | 739 |
|
---|
[3621] | 740 | if (line != empty_line_marker) {
|
---|
[2725] | 741 | /* Width of 7 preserves tab spacing in the text */
|
---|
| 742 | fmt = "%7u ";
|
---|
| 743 | n = LINENO(line) + 1;
|
---|
[3621] | 744 | if (n > 9999999 && MAXLINES > 9999999) {
|
---|
[2725] | 745 | n %= 10000000;
|
---|
| 746 | fmt = "%07u ";
|
---|
| 747 | }
|
---|
| 748 | }
|
---|
[3621] | 749 | printf(fmt, n);
|
---|
[2725] | 750 | }
|
---|
| 751 |
|
---|
| 752 |
|
---|
[1765] | 753 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 754 | static void print_found(const char *line)
|
---|
| 755 | {
|
---|
| 756 | int match_status;
|
---|
| 757 | int eflags;
|
---|
| 758 | char *growline;
|
---|
| 759 | regmatch_t match_structs;
|
---|
| 760 |
|
---|
[3621] | 761 | char buf[width+1];
|
---|
[1765] | 762 | const char *str = line;
|
---|
| 763 | char *p = buf;
|
---|
| 764 | size_t n;
|
---|
| 765 |
|
---|
| 766 | while (*str) {
|
---|
| 767 | n = strcspn(str, controls);
|
---|
| 768 | if (n) {
|
---|
| 769 | if (!str[n]) break;
|
---|
| 770 | memcpy(p, str, n);
|
---|
| 771 | p += n;
|
---|
| 772 | str += n;
|
---|
[821] | 773 | }
|
---|
[1765] | 774 | n = strspn(str, controls);
|
---|
| 775 | memset(p, '.', n);
|
---|
| 776 | p += n;
|
---|
| 777 | str += n;
|
---|
| 778 | }
|
---|
| 779 | strcpy(p, str);
|
---|
| 780 |
|
---|
| 781 | /* buf[] holds quarantined version of str */
|
---|
| 782 |
|
---|
| 783 | /* Each part of the line that matches has the HIGHLIGHT
|
---|
[3232] | 784 | * and NORMAL escape sequences placed around it.
|
---|
| 785 | * NB: we regex against line, but insert text
|
---|
| 786 | * from quarantined copy (buf[]) */
|
---|
[1765] | 787 | str = buf;
|
---|
| 788 | growline = NULL;
|
---|
| 789 | eflags = 0;
|
---|
| 790 | goto start;
|
---|
| 791 |
|
---|
| 792 | while (match_status == 0) {
|
---|
| 793 | char *new = xasprintf("%s%.*s"HIGHLIGHT"%.*s"NORMAL,
|
---|
[2725] | 794 | growline ? growline : "",
|
---|
[3232] | 795 | (int)match_structs.rm_so, str,
|
---|
| 796 | (int)(match_structs.rm_eo - match_structs.rm_so),
|
---|
[1765] | 797 | str + match_structs.rm_so);
|
---|
[2725] | 798 | free(growline);
|
---|
| 799 | growline = new;
|
---|
[1765] | 800 | str += match_structs.rm_eo;
|
---|
| 801 | line += match_structs.rm_eo;
|
---|
| 802 | eflags = REG_NOTBOL;
|
---|
| 803 | start:
|
---|
| 804 | /* Most of the time doesn't find the regex, optimize for that */
|
---|
| 805 | match_status = regexec(&pattern, line, 1, &match_structs, eflags);
|
---|
[2725] | 806 | /* if even "" matches, treat it as "not a match" */
|
---|
| 807 | if (match_structs.rm_so >= match_structs.rm_eo)
|
---|
| 808 | match_status = 1;
|
---|
[1765] | 809 | }
|
---|
| 810 |
|
---|
[3621] | 811 | printf("%s%s\n", growline ? growline : "", str);
|
---|
[1765] | 812 | free(growline);
|
---|
| 813 | }
|
---|
| 814 | #else
|
---|
| 815 | void print_found(const char *line);
|
---|
| 816 | #endif
|
---|
| 817 |
|
---|
| 818 | static void print_ascii(const char *str)
|
---|
| 819 | {
|
---|
[3621] | 820 | char buf[width+1];
|
---|
[1765] | 821 | char *p;
|
---|
| 822 | size_t n;
|
---|
| 823 |
|
---|
| 824 | while (*str) {
|
---|
| 825 | n = strcspn(str, controls);
|
---|
| 826 | if (n) {
|
---|
| 827 | if (!str[n]) break;
|
---|
| 828 | printf("%.*s", (int) n, str);
|
---|
| 829 | str += n;
|
---|
[821] | 830 | }
|
---|
[1765] | 831 | n = strspn(str, controls);
|
---|
| 832 | p = buf;
|
---|
| 833 | do {
|
---|
| 834 | if (*str == 0x7f)
|
---|
| 835 | *p++ = '?';
|
---|
| 836 | else if (*str == (char)0x9b)
|
---|
| 837 | /* VT100's CSI, aka Meta-ESC. Who's inventor? */
|
---|
| 838 | /* I want to know who committed this sin */
|
---|
| 839 | *p++ = '{';
|
---|
| 840 | else
|
---|
| 841 | *p++ = ctrlconv[(unsigned char)*str];
|
---|
| 842 | str++;
|
---|
| 843 | } while (--n);
|
---|
| 844 | *p = '\0';
|
---|
| 845 | print_hilite(buf);
|
---|
[821] | 846 | }
|
---|
[1765] | 847 | puts(str);
|
---|
[821] | 848 | }
|
---|
| 849 |
|
---|
| 850 | /* Print the buffer */
|
---|
| 851 | static void buffer_print(void)
|
---|
| 852 | {
|
---|
[2725] | 853 | unsigned i;
|
---|
[821] | 854 |
|
---|
[1765] | 855 | move_cursor(0, 0);
|
---|
[3621] | 856 | for (i = 0; i <= max_displayed_line; i++) {
|
---|
| 857 | printf(CLEAR_2_EOL);
|
---|
| 858 | if (option_mask32 & FLAG_N)
|
---|
| 859 | print_lineno(buffer[i]);
|
---|
[1765] | 860 | if (pattern_valid)
|
---|
| 861 | print_found(buffer[i]);
|
---|
| 862 | else
|
---|
| 863 | print_ascii(buffer[i]);
|
---|
[3621] | 864 | }
|
---|
| 865 | if ((option_mask32 & FLAG_E)
|
---|
| 866 | && eof_error <= 0
|
---|
| 867 | && (max_fline - cur_fline) <= max_displayed_line
|
---|
| 868 | ) {
|
---|
| 869 | less_exit(EXIT_SUCCESS);
|
---|
| 870 | }
|
---|
[821] | 871 | status_print();
|
---|
| 872 | }
|
---|
| 873 |
|
---|
[1765] | 874 | static void buffer_fill_and_print(void)
|
---|
[821] | 875 | {
|
---|
[2725] | 876 | unsigned i;
|
---|
[3621] | 877 | #if ENABLE_FEATURE_LESS_TRUNCATE
|
---|
[2725] | 878 | int fpos = cur_fline;
|
---|
| 879 |
|
---|
| 880 | if (option_mask32 & FLAG_S) {
|
---|
| 881 | /* Go back to the beginning of this line */
|
---|
| 882 | while (fpos && LINENO(flines[fpos]) == LINENO(flines[fpos-1]))
|
---|
| 883 | fpos--;
|
---|
| 884 | }
|
---|
| 885 |
|
---|
| 886 | i = 0;
|
---|
| 887 | while (i <= max_displayed_line && fpos <= max_fline) {
|
---|
| 888 | int lineno = LINENO(flines[fpos]);
|
---|
| 889 | buffer[i] = flines[fpos];
|
---|
| 890 | i++;
|
---|
| 891 | do {
|
---|
| 892 | fpos++;
|
---|
| 893 | } while ((fpos <= max_fline)
|
---|
| 894 | && (option_mask32 & FLAG_S)
|
---|
| 895 | && lineno == LINENO(flines[fpos])
|
---|
| 896 | );
|
---|
| 897 | }
|
---|
| 898 | #else
|
---|
[1765] | 899 | for (i = 0; i <= max_displayed_line && cur_fline + i <= max_fline; i++) {
|
---|
| 900 | buffer[i] = flines[cur_fline + i];
|
---|
[821] | 901 | }
|
---|
[2725] | 902 | #endif
|
---|
[1765] | 903 | for (; i <= max_displayed_line; i++) {
|
---|
| 904 | buffer[i] = empty_line_marker;
|
---|
[821] | 905 | }
|
---|
[1765] | 906 | buffer_print();
|
---|
[821] | 907 | }
|
---|
| 908 |
|
---|
[3621] | 909 | /* move cur_fline to a given line number, reading lines if necessary */
|
---|
| 910 | static void goto_lineno(int target)
|
---|
| 911 | {
|
---|
| 912 | if (target <= 0 ) {
|
---|
| 913 | cur_fline = 0;
|
---|
| 914 | }
|
---|
| 915 | else if (target > LINENO(flines[cur_fline])) {
|
---|
| 916 | retry:
|
---|
| 917 | while (LINENO(flines[cur_fline]) != target && cur_fline < max_fline)
|
---|
| 918 | ++cur_fline;
|
---|
| 919 | /* target not reached but more input is available */
|
---|
| 920 | if (LINENO(flines[cur_fline]) != target && eof_error > 0) {
|
---|
| 921 | read_lines();
|
---|
| 922 | goto retry;
|
---|
| 923 | }
|
---|
| 924 | }
|
---|
| 925 | else {
|
---|
| 926 | /* search backwards through already-read lines */
|
---|
| 927 | while (LINENO(flines[cur_fline]) != target && cur_fline > 0)
|
---|
| 928 | --cur_fline;
|
---|
| 929 | }
|
---|
| 930 | }
|
---|
| 931 |
|
---|
| 932 | static void cap_cur_fline(void)
|
---|
| 933 | {
|
---|
| 934 | if ((option_mask32 & FLAG_S)) {
|
---|
| 935 | if (cur_fline > max_fline)
|
---|
| 936 | cur_fline = max_fline;
|
---|
| 937 | if (LINENO(flines[cur_fline]) + max_displayed_line > max_lineno + TILDES) {
|
---|
| 938 | goto_lineno(max_lineno - max_displayed_line + TILDES);
|
---|
| 939 | read_lines();
|
---|
| 940 | }
|
---|
| 941 | }
|
---|
| 942 | else {
|
---|
| 943 | if (cur_fline + max_displayed_line > max_fline + TILDES)
|
---|
| 944 | cur_fline = max_fline - max_displayed_line + TILDES;
|
---|
| 945 | if (cur_fline < 0)
|
---|
| 946 | cur_fline = 0;
|
---|
| 947 | }
|
---|
| 948 | }
|
---|
| 949 |
|
---|
[821] | 950 | /* Move the buffer up and down in the file in order to scroll */
|
---|
| 951 | static void buffer_down(int nlines)
|
---|
| 952 | {
|
---|
[3621] | 953 | if ((option_mask32 & FLAG_S))
|
---|
| 954 | goto_lineno(LINENO(flines[cur_fline]) + nlines);
|
---|
| 955 | else
|
---|
| 956 | cur_fline += nlines;
|
---|
[1765] | 957 | read_lines();
|
---|
[3621] | 958 | cap_cur_fline();
|
---|
[1765] | 959 | buffer_fill_and_print();
|
---|
| 960 | }
|
---|
[821] | 961 |
|
---|
[1765] | 962 | static void buffer_up(int nlines)
|
---|
| 963 | {
|
---|
[3621] | 964 | if ((option_mask32 & FLAG_S)) {
|
---|
| 965 | goto_lineno(LINENO(flines[cur_fline]) - nlines);
|
---|
| 966 | }
|
---|
| 967 | else {
|
---|
| 968 | cur_fline -= nlines;
|
---|
| 969 | if (cur_fline < 0)
|
---|
| 970 | cur_fline = 0;
|
---|
| 971 | }
|
---|
[1765] | 972 | read_lines();
|
---|
| 973 | buffer_fill_and_print();
|
---|
| 974 | }
|
---|
[821] | 975 |
|
---|
[3621] | 976 | /* display a given line where the argument can be either an index into
|
---|
| 977 | * the flines array or a line number */
|
---|
| 978 | static void buffer_to_line(int linenum, int is_lineno)
|
---|
[1765] | 979 | {
|
---|
[3621] | 980 | if (linenum <= 0)
|
---|
| 981 | cur_fline = 0;
|
---|
| 982 | else if (is_lineno)
|
---|
| 983 | goto_lineno(linenum);
|
---|
| 984 | else
|
---|
| 985 | cur_fline = linenum;
|
---|
[1765] | 986 | read_lines();
|
---|
[3621] | 987 | cap_cur_fline();
|
---|
[1765] | 988 | buffer_fill_and_print();
|
---|
| 989 | }
|
---|
| 990 |
|
---|
[3621] | 991 | static void buffer_line(int linenum)
|
---|
| 992 | {
|
---|
| 993 | buffer_to_line(linenum, FALSE);
|
---|
| 994 | }
|
---|
| 995 |
|
---|
| 996 | static void buffer_lineno(int lineno)
|
---|
| 997 | {
|
---|
| 998 | buffer_to_line(lineno, TRUE);
|
---|
| 999 | }
|
---|
| 1000 |
|
---|
[1765] | 1001 | static void open_file_and_read_lines(void)
|
---|
| 1002 | {
|
---|
| 1003 | if (filename) {
|
---|
[2725] | 1004 | xmove_fd(xopen(filename, O_RDONLY), STDIN_FILENO);
|
---|
[3621] | 1005 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1006 | num_lines = REOPEN_AND_COUNT;
|
---|
| 1007 | #endif
|
---|
[1765] | 1008 | } else {
|
---|
| 1009 | /* "less" with no arguments in argv[] */
|
---|
| 1010 | /* For status line only */
|
---|
| 1011 | filename = xstrdup(bb_msg_standard_input);
|
---|
[3621] | 1012 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1013 | num_lines = REOPEN_STDIN;
|
---|
| 1014 | #endif
|
---|
[821] | 1015 | }
|
---|
[1765] | 1016 | readpos = 0;
|
---|
| 1017 | readeof = 0;
|
---|
[2725] | 1018 | last_line_pos = 0;
|
---|
[1765] | 1019 | terminated = 1;
|
---|
| 1020 | read_lines();
|
---|
[821] | 1021 | }
|
---|
| 1022 |
|
---|
[1765] | 1023 | /* Reinitialize everything for a new file - free the memory and start over */
|
---|
| 1024 | static void reinitialize(void)
|
---|
[821] | 1025 | {
|
---|
[2725] | 1026 | unsigned i;
|
---|
[821] | 1027 |
|
---|
[1765] | 1028 | if (flines) {
|
---|
| 1029 | for (i = 0; i <= max_fline; i++)
|
---|
[2725] | 1030 | free(MEMPTR(flines[i]));
|
---|
[1765] | 1031 | free(flines);
|
---|
| 1032 | flines = NULL;
|
---|
[821] | 1033 | }
|
---|
| 1034 |
|
---|
[1765] | 1035 | max_fline = -1;
|
---|
| 1036 | cur_fline = 0;
|
---|
| 1037 | max_lineno = 0;
|
---|
| 1038 | open_file_and_read_lines();
|
---|
[3232] | 1039 | #if ENABLE_FEATURE_LESS_ASK_TERMINAL
|
---|
| 1040 | if (G.winsize_err)
|
---|
| 1041 | printf("\033[999;999H" "\033[6n");
|
---|
| 1042 | #endif
|
---|
[1765] | 1043 | buffer_fill_and_print();
|
---|
[821] | 1044 | }
|
---|
| 1045 |
|
---|
[3232] | 1046 | static int64_t getch_nowait(void)
|
---|
[821] | 1047 | {
|
---|
[2725] | 1048 | int rd;
|
---|
[3232] | 1049 | int64_t key64;
|
---|
[2725] | 1050 | struct pollfd pfd[2];
|
---|
| 1051 |
|
---|
| 1052 | pfd[0].fd = STDIN_FILENO;
|
---|
| 1053 | pfd[0].events = POLLIN;
|
---|
| 1054 | pfd[1].fd = kbd_fd;
|
---|
| 1055 | pfd[1].events = POLLIN;
|
---|
[1765] | 1056 | again:
|
---|
[2725] | 1057 | tcsetattr(kbd_fd, TCSANOW, &term_less);
|
---|
| 1058 | /* NB: select/poll returns whenever read will not block. Therefore:
|
---|
| 1059 | * if eof is reached, select/poll will return immediately
|
---|
| 1060 | * because read will immediately return 0 bytes.
|
---|
| 1061 | * Even if select/poll says that input is available, read CAN block
|
---|
[1765] | 1062 | * (switch fd into O_NONBLOCK'ed mode to avoid it)
|
---|
| 1063 | */
|
---|
[2725] | 1064 | rd = 1;
|
---|
| 1065 | /* Are we interested in stdin? */
|
---|
[3621] | 1066 | if (at_end()) {
|
---|
[2725] | 1067 | if (eof_error > 0) /* did NOT reach eof yet */
|
---|
| 1068 | rd = 0; /* yes, we are interested in stdin */
|
---|
[821] | 1069 | }
|
---|
[2725] | 1070 | /* Position cursor if line input is done */
|
---|
| 1071 | if (less_gets_pos >= 0)
|
---|
| 1072 | move_cursor(max_displayed_line + 2, less_gets_pos + 1);
|
---|
| 1073 | fflush_all();
|
---|
[1765] | 1074 |
|
---|
[2725] | 1075 | if (kbd_input[0] == 0) { /* if nothing is buffered */
|
---|
| 1076 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1077 | while (1) {
|
---|
| 1078 | int r;
|
---|
| 1079 | /* NB: SIGWINCH interrupts poll() */
|
---|
| 1080 | r = poll(pfd + rd, 2 - rd, -1);
|
---|
| 1081 | if (/*r < 0 && errno == EINTR &&*/ winch_counter)
|
---|
| 1082 | return '\\'; /* anything which has no defined function */
|
---|
| 1083 | if (r) break;
|
---|
| 1084 | }
|
---|
| 1085 | #else
|
---|
| 1086 | safe_poll(pfd + rd, 2 - rd, -1);
|
---|
| 1087 | #endif
|
---|
[821] | 1088 | }
|
---|
[2725] | 1089 |
|
---|
| 1090 | /* We have kbd_fd in O_NONBLOCK mode, read inside read_key()
|
---|
| 1091 | * would not block even if there is no input available */
|
---|
[3232] | 1092 | key64 = read_key(kbd_fd, kbd_input, /*timeout off:*/ -2);
|
---|
| 1093 | if ((int)key64 == -1) {
|
---|
[2725] | 1094 | if (errno == EAGAIN) {
|
---|
| 1095 | /* No keyboard input available. Since poll() did return,
|
---|
| 1096 | * we should have input on stdin */
|
---|
| 1097 | read_lines();
|
---|
| 1098 | buffer_fill_and_print();
|
---|
| 1099 | goto again;
|
---|
| 1100 | }
|
---|
| 1101 | /* EOF/error (ssh session got killed etc) */
|
---|
| 1102 | less_exit(0);
|
---|
| 1103 | }
|
---|
| 1104 | set_tty_cooked();
|
---|
[3232] | 1105 | return key64;
|
---|
[1765] | 1106 | }
|
---|
| 1107 |
|
---|
[2725] | 1108 | /* Grab a character from input without requiring the return key.
|
---|
| 1109 | * May return KEYCODE_xxx values.
|
---|
| 1110 | * Note that this function works best with raw input. */
|
---|
[3232] | 1111 | static int64_t less_getch(int pos)
|
---|
[1765] | 1112 | {
|
---|
[3232] | 1113 | int64_t key64;
|
---|
| 1114 | int key;
|
---|
[2725] | 1115 |
|
---|
[1765] | 1116 | again:
|
---|
[2725] | 1117 | less_gets_pos = pos;
|
---|
[3232] | 1118 | key = key64 = getch_nowait();
|
---|
[2725] | 1119 | less_gets_pos = -1;
|
---|
[1765] | 1120 |
|
---|
[3232] | 1121 | /* Discard Ctrl-something chars.
|
---|
| 1122 | * (checking only lower 32 bits is a size optimization:
|
---|
| 1123 | * upper 32 bits are used only by KEYCODE_CURSOR_POS)
|
---|
| 1124 | */
|
---|
| 1125 | if (key >= 0 && key < ' ' && key != 0x0d && key != 8)
|
---|
[2725] | 1126 | goto again;
|
---|
[3232] | 1127 |
|
---|
| 1128 | return key64;
|
---|
[821] | 1129 | }
|
---|
| 1130 |
|
---|
[1765] | 1131 | static char* less_gets(int sz)
|
---|
[821] | 1132 | {
|
---|
[2725] | 1133 | int c;
|
---|
| 1134 | unsigned i = 0;
|
---|
[1765] | 1135 | char *result = xzalloc(1);
|
---|
[2725] | 1136 |
|
---|
[1765] | 1137 | while (1) {
|
---|
| 1138 | c = '\0';
|
---|
[2725] | 1139 | less_gets_pos = sz + i;
|
---|
| 1140 | c = getch_nowait();
|
---|
| 1141 | if (c == 0x0d) {
|
---|
| 1142 | result[i] = '\0';
|
---|
| 1143 | less_gets_pos = -1;
|
---|
[1765] | 1144 | return result;
|
---|
[2725] | 1145 | }
|
---|
[1765] | 1146 | if (c == 0x7f)
|
---|
| 1147 | c = 8;
|
---|
| 1148 | if (c == 8 && i) {
|
---|
| 1149 | printf("\x8 \x8");
|
---|
| 1150 | i--;
|
---|
| 1151 | }
|
---|
[2725] | 1152 | if (c < ' ') /* filters out KEYCODE_xxx too (<0) */
|
---|
[1765] | 1153 | continue;
|
---|
| 1154 | if (i >= width - sz - 1)
|
---|
| 1155 | continue; /* len limit */
|
---|
[2725] | 1156 | bb_putchar(c);
|
---|
[1765] | 1157 | result[i++] = c;
|
---|
| 1158 | result = xrealloc(result, i+1);
|
---|
| 1159 | }
|
---|
[821] | 1160 | }
|
---|
| 1161 |
|
---|
| 1162 | static void examine_file(void)
|
---|
| 1163 | {
|
---|
[2725] | 1164 | char *new_fname;
|
---|
| 1165 |
|
---|
[1765] | 1166 | print_statusline("Examine: ");
|
---|
[2725] | 1167 | new_fname = less_gets(sizeof("Examine: ") - 1);
|
---|
| 1168 | if (!new_fname[0]) {
|
---|
| 1169 | status_print();
|
---|
| 1170 | err:
|
---|
| 1171 | free(new_fname);
|
---|
| 1172 | return;
|
---|
| 1173 | }
|
---|
| 1174 | if (access(new_fname, R_OK) != 0) {
|
---|
| 1175 | print_statusline("Cannot read this file");
|
---|
| 1176 | goto err;
|
---|
| 1177 | }
|
---|
[1765] | 1178 | free(filename);
|
---|
[2725] | 1179 | filename = new_fname;
|
---|
[1765] | 1180 | /* files start by = argv. why we assume that argv is infinitely long??
|
---|
| 1181 | files[num_files] = filename;
|
---|
[821] | 1182 | current_file = num_files + 1;
|
---|
[1765] | 1183 | num_files++; */
|
---|
| 1184 | files[0] = filename;
|
---|
| 1185 | num_files = current_file = 1;
|
---|
| 1186 | reinitialize();
|
---|
[821] | 1187 | }
|
---|
| 1188 |
|
---|
| 1189 | /* This function changes the file currently being paged. direction can be one of the following:
|
---|
| 1190 | * -1: go back one file
|
---|
| 1191 | * 0: go to the first file
|
---|
[1765] | 1192 | * 1: go forward one file */
|
---|
[821] | 1193 | static void change_file(int direction)
|
---|
| 1194 | {
|
---|
| 1195 | if (current_file != ((direction > 0) ? num_files : 1)) {
|
---|
| 1196 | current_file = direction ? current_file + direction : 1;
|
---|
[1765] | 1197 | free(filename);
|
---|
| 1198 | filename = xstrdup(files[current_file - 1]);
|
---|
| 1199 | reinitialize();
|
---|
| 1200 | } else {
|
---|
| 1201 | print_statusline(direction > 0 ? "No next file" : "No previous file");
|
---|
[821] | 1202 | }
|
---|
| 1203 | }
|
---|
| 1204 |
|
---|
| 1205 | static void remove_current_file(void)
|
---|
| 1206 | {
|
---|
[2725] | 1207 | unsigned i;
|
---|
[821] | 1208 |
|
---|
[1765] | 1209 | if (num_files < 2)
|
---|
| 1210 | return;
|
---|
| 1211 |
|
---|
[821] | 1212 | if (current_file != 1) {
|
---|
| 1213 | change_file(-1);
|
---|
| 1214 | for (i = 3; i <= num_files; i++)
|
---|
| 1215 | files[i - 2] = files[i - 1];
|
---|
| 1216 | num_files--;
|
---|
[1765] | 1217 | } else {
|
---|
[821] | 1218 | change_file(1);
|
---|
| 1219 | for (i = 2; i <= num_files; i++)
|
---|
| 1220 | files[i - 2] = files[i - 1];
|
---|
| 1221 | num_files--;
|
---|
| 1222 | current_file--;
|
---|
| 1223 | }
|
---|
| 1224 | }
|
---|
| 1225 |
|
---|
| 1226 | static void colon_process(void)
|
---|
| 1227 | {
|
---|
| 1228 | int keypress;
|
---|
| 1229 |
|
---|
| 1230 | /* Clear the current line and print a prompt */
|
---|
[1765] | 1231 | print_statusline(" :");
|
---|
[821] | 1232 |
|
---|
[2725] | 1233 | keypress = less_getch(2);
|
---|
[821] | 1234 | switch (keypress) {
|
---|
[1765] | 1235 | case 'd':
|
---|
| 1236 | remove_current_file();
|
---|
| 1237 | break;
|
---|
| 1238 | case 'e':
|
---|
| 1239 | examine_file();
|
---|
| 1240 | break;
|
---|
| 1241 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1242 | case 'f':
|
---|
| 1243 | m_status_print();
|
---|
| 1244 | break;
|
---|
[821] | 1245 | #endif
|
---|
[1765] | 1246 | case 'n':
|
---|
| 1247 | change_file(1);
|
---|
| 1248 | break;
|
---|
| 1249 | case 'p':
|
---|
| 1250 | change_file(-1);
|
---|
| 1251 | break;
|
---|
| 1252 | case 'q':
|
---|
[2725] | 1253 | less_exit(EXIT_SUCCESS);
|
---|
[1765] | 1254 | break;
|
---|
| 1255 | case 'x':
|
---|
| 1256 | change_file(0);
|
---|
| 1257 | break;
|
---|
[821] | 1258 | }
|
---|
| 1259 | }
|
---|
| 1260 |
|
---|
[1765] | 1261 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1262 | static void normalize_match_pos(int match)
|
---|
| 1263 | {
|
---|
| 1264 | if (match >= num_matches)
|
---|
| 1265 | match = num_matches - 1;
|
---|
| 1266 | if (match < 0)
|
---|
| 1267 | match = 0;
|
---|
| 1268 | match_pos = match;
|
---|
| 1269 | }
|
---|
[821] | 1270 |
|
---|
[1765] | 1271 | static void goto_match(int match)
|
---|
[821] | 1272 | {
|
---|
[1765] | 1273 | if (!pattern_valid)
|
---|
| 1274 | return;
|
---|
| 1275 | if (match < 0)
|
---|
| 1276 | match = 0;
|
---|
| 1277 | /* Try to find next match if eof isn't reached yet */
|
---|
| 1278 | if (match >= num_matches && eof_error > 0) {
|
---|
[2725] | 1279 | wanted_match = match; /* "I want to read until I see N'th match" */
|
---|
[1765] | 1280 | read_lines();
|
---|
[821] | 1281 | }
|
---|
[1765] | 1282 | if (num_matches) {
|
---|
| 1283 | normalize_match_pos(match);
|
---|
| 1284 | buffer_line(match_lines[match_pos]);
|
---|
| 1285 | } else {
|
---|
| 1286 | print_statusline("No matches found");
|
---|
| 1287 | }
|
---|
[821] | 1288 | }
|
---|
| 1289 |
|
---|
[1765] | 1290 | static void fill_match_lines(unsigned pos)
|
---|
[821] | 1291 | {
|
---|
[1765] | 1292 | if (!pattern_valid)
|
---|
| 1293 | return;
|
---|
| 1294 | /* Run the regex on each line of the current file */
|
---|
| 1295 | while (pos <= max_fline) {
|
---|
| 1296 | /* If this line matches */
|
---|
| 1297 | if (regexec(&pattern, flines[pos], 0, NULL, 0) == 0
|
---|
| 1298 | /* and we didn't match it last time */
|
---|
| 1299 | && !(num_matches && match_lines[num_matches-1] == pos)
|
---|
| 1300 | ) {
|
---|
[2725] | 1301 | match_lines = xrealloc_vector(match_lines, 4, num_matches);
|
---|
[1765] | 1302 | match_lines[num_matches++] = pos;
|
---|
| 1303 | }
|
---|
| 1304 | pos++;
|
---|
[821] | 1305 | }
|
---|
| 1306 | }
|
---|
| 1307 |
|
---|
| 1308 | static void regex_process(void)
|
---|
| 1309 | {
|
---|
[1765] | 1310 | char *uncomp_regex, *err;
|
---|
| 1311 |
|
---|
| 1312 | /* Reset variables */
|
---|
| 1313 | free(match_lines);
|
---|
| 1314 | match_lines = NULL;
|
---|
| 1315 | match_pos = 0;
|
---|
| 1316 | num_matches = 0;
|
---|
| 1317 | if (pattern_valid) {
|
---|
| 1318 | regfree(&pattern);
|
---|
| 1319 | pattern_valid = 0;
|
---|
| 1320 | }
|
---|
| 1321 |
|
---|
[821] | 1322 | /* Get the uncompiled regular expression from the user */
|
---|
| 1323 | clear_line();
|
---|
[2725] | 1324 | bb_putchar((option_mask32 & LESS_STATE_MATCH_BACKWARDS) ? '?' : '/');
|
---|
[1765] | 1325 | uncomp_regex = less_gets(1);
|
---|
| 1326 | if (!uncomp_regex[0]) {
|
---|
| 1327 | free(uncomp_regex);
|
---|
| 1328 | buffer_print();
|
---|
[821] | 1329 | return;
|
---|
| 1330 | }
|
---|
[1765] | 1331 |
|
---|
[821] | 1332 | /* Compile the regex and check for errors */
|
---|
[2725] | 1333 | err = regcomp_or_errmsg(&pattern, uncomp_regex,
|
---|
| 1334 | (option_mask32 & FLAG_I) ? REG_ICASE : 0);
|
---|
[1765] | 1335 | free(uncomp_regex);
|
---|
| 1336 | if (err) {
|
---|
| 1337 | print_statusline(err);
|
---|
| 1338 | free(err);
|
---|
| 1339 | return;
|
---|
| 1340 | }
|
---|
[821] | 1341 |
|
---|
[1765] | 1342 | pattern_valid = 1;
|
---|
[821] | 1343 | match_pos = 0;
|
---|
[1765] | 1344 | fill_match_lines(0);
|
---|
| 1345 | while (match_pos < num_matches) {
|
---|
[2725] | 1346 | if ((int)match_lines[match_pos] > cur_fline)
|
---|
[1765] | 1347 | break;
|
---|
| 1348 | match_pos++;
|
---|
[821] | 1349 | }
|
---|
[1765] | 1350 | if (option_mask32 & LESS_STATE_MATCH_BACKWARDS)
|
---|
| 1351 | match_pos--;
|
---|
| 1352 |
|
---|
| 1353 | /* It's possible that no matches are found yet.
|
---|
| 1354 | * goto_match() will read input looking for match,
|
---|
| 1355 | * if needed */
|
---|
| 1356 | goto_match(match_pos);
|
---|
[821] | 1357 | }
|
---|
| 1358 | #endif
|
---|
| 1359 |
|
---|
| 1360 | static void number_process(int first_digit)
|
---|
| 1361 | {
|
---|
[2725] | 1362 | unsigned i;
|
---|
[821] | 1363 | int num;
|
---|
[2725] | 1364 | int keypress;
|
---|
[1765] | 1365 | char num_input[sizeof(int)*4]; /* more than enough */
|
---|
[821] | 1366 |
|
---|
| 1367 | num_input[0] = first_digit;
|
---|
| 1368 |
|
---|
| 1369 | /* Clear the current line, print a prompt, and then print the digit */
|
---|
| 1370 | clear_line();
|
---|
| 1371 | printf(":%c", first_digit);
|
---|
| 1372 |
|
---|
[1765] | 1373 | /* Receive input until a letter is given */
|
---|
[2725] | 1374 | i = 1;
|
---|
[1765] | 1375 | while (i < sizeof(num_input)-1) {
|
---|
[2725] | 1376 | keypress = less_getch(i + 1);
|
---|
[3621] | 1377 | if ((unsigned)keypress > 255 || !isdigit(keypress))
|
---|
[1765] | 1378 | break;
|
---|
[2725] | 1379 | num_input[i] = keypress;
|
---|
| 1380 | bb_putchar(keypress);
|
---|
[821] | 1381 | i++;
|
---|
| 1382 | }
|
---|
| 1383 |
|
---|
| 1384 | num_input[i] = '\0';
|
---|
[1765] | 1385 | num = bb_strtou(num_input, NULL, 10);
|
---|
| 1386 | /* on format error, num == -1 */
|
---|
| 1387 | if (num < 1 || num > MAXLINES) {
|
---|
[821] | 1388 | buffer_print();
|
---|
| 1389 | return;
|
---|
| 1390 | }
|
---|
| 1391 |
|
---|
| 1392 | /* We now know the number and the letter entered, so we process them */
|
---|
| 1393 | switch (keypress) {
|
---|
[2725] | 1394 | case KEYCODE_DOWN: case 'z': case 'd': case 'e': case ' ': case '\015':
|
---|
[1765] | 1395 | buffer_down(num);
|
---|
| 1396 | break;
|
---|
[2725] | 1397 | case KEYCODE_UP: case 'b': case 'w': case 'y': case 'u':
|
---|
[1765] | 1398 | buffer_up(num);
|
---|
| 1399 | break;
|
---|
| 1400 | case 'g': case '<': case 'G': case '>':
|
---|
[3621] | 1401 | buffer_lineno(num - 1);
|
---|
[1765] | 1402 | break;
|
---|
| 1403 | case 'p': case '%':
|
---|
[3621] | 1404 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1405 | update_num_lines();
|
---|
| 1406 | num = num * (num_lines > 0 ? num_lines : max_lineno) / 100;
|
---|
| 1407 | #else
|
---|
| 1408 | num = num * max_lineno / 100;
|
---|
| 1409 | #endif
|
---|
| 1410 | buffer_lineno(num);
|
---|
[1765] | 1411 | break;
|
---|
| 1412 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1413 | case 'n':
|
---|
| 1414 | goto_match(match_pos + num);
|
---|
| 1415 | break;
|
---|
| 1416 | case '/':
|
---|
| 1417 | option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1418 | regex_process();
|
---|
| 1419 | break;
|
---|
| 1420 | case '?':
|
---|
| 1421 | option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1422 | regex_process();
|
---|
| 1423 | break;
|
---|
[821] | 1424 | #endif
|
---|
| 1425 | }
|
---|
| 1426 | }
|
---|
| 1427 |
|
---|
[2725] | 1428 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
[821] | 1429 | static void flag_change(void)
|
---|
| 1430 | {
|
---|
| 1431 | int keypress;
|
---|
| 1432 |
|
---|
| 1433 | clear_line();
|
---|
[2725] | 1434 | bb_putchar('-');
|
---|
| 1435 | keypress = less_getch(1);
|
---|
[821] | 1436 |
|
---|
| 1437 | switch (keypress) {
|
---|
[1765] | 1438 | case 'M':
|
---|
| 1439 | option_mask32 ^= FLAG_M;
|
---|
| 1440 | break;
|
---|
| 1441 | case 'm':
|
---|
| 1442 | option_mask32 ^= FLAG_m;
|
---|
| 1443 | break;
|
---|
| 1444 | case 'E':
|
---|
| 1445 | option_mask32 ^= FLAG_E;
|
---|
| 1446 | break;
|
---|
| 1447 | case '~':
|
---|
| 1448 | option_mask32 ^= FLAG_TILDE;
|
---|
| 1449 | break;
|
---|
[3621] | 1450 | #if ENABLE_FEATURE_LESS_TRUNCATE
|
---|
[2725] | 1451 | case 'S':
|
---|
| 1452 | option_mask32 ^= FLAG_S;
|
---|
| 1453 | buffer_fill_and_print();
|
---|
| 1454 | break;
|
---|
[3621] | 1455 | #endif
|
---|
[2725] | 1456 | #if ENABLE_FEATURE_LESS_LINENUMS
|
---|
| 1457 | case 'N':
|
---|
| 1458 | option_mask32 ^= FLAG_N;
|
---|
| 1459 | re_wrap();
|
---|
| 1460 | buffer_fill_and_print();
|
---|
| 1461 | break;
|
---|
| 1462 | #endif
|
---|
[821] | 1463 | }
|
---|
| 1464 | }
|
---|
| 1465 |
|
---|
[2725] | 1466 | #ifdef BLOAT
|
---|
[821] | 1467 | static void show_flag_status(void)
|
---|
| 1468 | {
|
---|
| 1469 | int keypress;
|
---|
| 1470 | int flag_val;
|
---|
| 1471 |
|
---|
| 1472 | clear_line();
|
---|
[2725] | 1473 | bb_putchar('_');
|
---|
| 1474 | keypress = less_getch(1);
|
---|
[821] | 1475 |
|
---|
| 1476 | switch (keypress) {
|
---|
[1765] | 1477 | case 'M':
|
---|
| 1478 | flag_val = option_mask32 & FLAG_M;
|
---|
| 1479 | break;
|
---|
| 1480 | case 'm':
|
---|
| 1481 | flag_val = option_mask32 & FLAG_m;
|
---|
| 1482 | break;
|
---|
| 1483 | case '~':
|
---|
| 1484 | flag_val = option_mask32 & FLAG_TILDE;
|
---|
| 1485 | break;
|
---|
| 1486 | case 'N':
|
---|
| 1487 | flag_val = option_mask32 & FLAG_N;
|
---|
| 1488 | break;
|
---|
| 1489 | case 'E':
|
---|
| 1490 | flag_val = option_mask32 & FLAG_E;
|
---|
| 1491 | break;
|
---|
| 1492 | default:
|
---|
| 1493 | flag_val = 0;
|
---|
| 1494 | break;
|
---|
[821] | 1495 | }
|
---|
| 1496 |
|
---|
| 1497 | clear_line();
|
---|
[1765] | 1498 | printf(HIGHLIGHT"The status of the flag is: %u"NORMAL, flag_val != 0);
|
---|
[821] | 1499 | }
|
---|
| 1500 | #endif
|
---|
| 1501 |
|
---|
[2725] | 1502 | #endif /* ENABLE_FEATURE_LESS_DASHCMD */
|
---|
| 1503 |
|
---|
[821] | 1504 | static void save_input_to_file(void)
|
---|
| 1505 | {
|
---|
[1765] | 1506 | const char *msg = "";
|
---|
| 1507 | char *current_line;
|
---|
[2725] | 1508 | unsigned i;
|
---|
[821] | 1509 | FILE *fp;
|
---|
| 1510 |
|
---|
[1765] | 1511 | print_statusline("Log file: ");
|
---|
| 1512 | current_line = less_gets(sizeof("Log file: ")-1);
|
---|
[2725] | 1513 | if (current_line[0]) {
|
---|
| 1514 | fp = fopen_for_write(current_line);
|
---|
[1765] | 1515 | if (!fp) {
|
---|
| 1516 | msg = "Error opening log file";
|
---|
| 1517 | goto ret;
|
---|
| 1518 | }
|
---|
| 1519 | for (i = 0; i <= max_fline; i++)
|
---|
| 1520 | fprintf(fp, "%s\n", flines[i]);
|
---|
[821] | 1521 | fclose(fp);
|
---|
[1765] | 1522 | msg = "Done";
|
---|
[821] | 1523 | }
|
---|
[1765] | 1524 | ret:
|
---|
| 1525 | print_statusline(msg);
|
---|
| 1526 | free(current_line);
|
---|
[821] | 1527 | }
|
---|
| 1528 |
|
---|
[1765] | 1529 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
[821] | 1530 | static void add_mark(void)
|
---|
| 1531 | {
|
---|
| 1532 | int letter;
|
---|
| 1533 |
|
---|
[1765] | 1534 | print_statusline("Mark: ");
|
---|
[2725] | 1535 | letter = less_getch(sizeof("Mark: ") - 1);
|
---|
[821] | 1536 |
|
---|
| 1537 | if (isalpha(letter)) {
|
---|
| 1538 | /* If we exceed 15 marks, start overwriting previous ones */
|
---|
| 1539 | if (num_marks == 14)
|
---|
| 1540 | num_marks = 0;
|
---|
| 1541 |
|
---|
| 1542 | mark_lines[num_marks][0] = letter;
|
---|
[1765] | 1543 | mark_lines[num_marks][1] = cur_fline;
|
---|
[821] | 1544 | num_marks++;
|
---|
[1765] | 1545 | } else {
|
---|
| 1546 | print_statusline("Invalid mark letter");
|
---|
[821] | 1547 | }
|
---|
| 1548 | }
|
---|
| 1549 |
|
---|
| 1550 | static void goto_mark(void)
|
---|
| 1551 | {
|
---|
| 1552 | int letter;
|
---|
| 1553 | int i;
|
---|
| 1554 |
|
---|
[1765] | 1555 | print_statusline("Go to mark: ");
|
---|
[2725] | 1556 | letter = less_getch(sizeof("Go to mark: ") - 1);
|
---|
[821] | 1557 | clear_line();
|
---|
| 1558 |
|
---|
| 1559 | if (isalpha(letter)) {
|
---|
| 1560 | for (i = 0; i <= num_marks; i++)
|
---|
| 1561 | if (letter == mark_lines[i][0]) {
|
---|
| 1562 | buffer_line(mark_lines[i][1]);
|
---|
| 1563 | break;
|
---|
| 1564 | }
|
---|
[1765] | 1565 | if (num_marks == 14 && letter != mark_lines[14][0])
|
---|
| 1566 | print_statusline("Mark not set");
|
---|
| 1567 | } else
|
---|
| 1568 | print_statusline("Invalid mark letter");
|
---|
[821] | 1569 | }
|
---|
| 1570 | #endif
|
---|
| 1571 |
|
---|
[1765] | 1572 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
[821] | 1573 | static char opp_bracket(char bracket)
|
---|
| 1574 | {
|
---|
| 1575 | switch (bracket) {
|
---|
[2725] | 1576 | case '{': case '[': /* '}' == '{' + 2. Same for '[' */
|
---|
| 1577 | bracket++;
|
---|
| 1578 | case '(': /* ')' == '(' + 1 */
|
---|
| 1579 | bracket++;
|
---|
| 1580 | break;
|
---|
| 1581 | case '}': case ']':
|
---|
| 1582 | bracket--;
|
---|
| 1583 | case ')':
|
---|
| 1584 | bracket--;
|
---|
| 1585 | break;
|
---|
| 1586 | };
|
---|
| 1587 | return bracket;
|
---|
[821] | 1588 | }
|
---|
| 1589 |
|
---|
| 1590 | static void match_right_bracket(char bracket)
|
---|
| 1591 | {
|
---|
[2725] | 1592 | unsigned i;
|
---|
[821] | 1593 |
|
---|
[1765] | 1594 | if (strchr(flines[cur_fline], bracket) == NULL) {
|
---|
| 1595 | print_statusline("No bracket in top line");
|
---|
| 1596 | return;
|
---|
| 1597 | }
|
---|
[2725] | 1598 | bracket = opp_bracket(bracket);
|
---|
[1765] | 1599 | for (i = cur_fline + 1; i < max_fline; i++) {
|
---|
[2725] | 1600 | if (strchr(flines[i], bracket) != NULL) {
|
---|
| 1601 | buffer_line(i);
|
---|
| 1602 | return;
|
---|
[821] | 1603 | }
|
---|
| 1604 | }
|
---|
[2725] | 1605 | print_statusline("No matching bracket found");
|
---|
[821] | 1606 | }
|
---|
| 1607 |
|
---|
| 1608 | static void match_left_bracket(char bracket)
|
---|
| 1609 | {
|
---|
| 1610 | int i;
|
---|
| 1611 |
|
---|
[1765] | 1612 | if (strchr(flines[cur_fline + max_displayed_line], bracket) == NULL) {
|
---|
| 1613 | print_statusline("No bracket in bottom line");
|
---|
| 1614 | return;
|
---|
| 1615 | }
|
---|
[821] | 1616 |
|
---|
[2725] | 1617 | bracket = opp_bracket(bracket);
|
---|
[1765] | 1618 | for (i = cur_fline + max_displayed_line; i >= 0; i--) {
|
---|
[2725] | 1619 | if (strchr(flines[i], bracket) != NULL) {
|
---|
| 1620 | buffer_line(i);
|
---|
| 1621 | return;
|
---|
[821] | 1622 | }
|
---|
| 1623 | }
|
---|
[2725] | 1624 | print_statusline("No matching bracket found");
|
---|
[821] | 1625 | }
|
---|
[1765] | 1626 | #endif /* FEATURE_LESS_BRACKETS */
|
---|
[821] | 1627 |
|
---|
| 1628 | static void keypress_process(int keypress)
|
---|
| 1629 | {
|
---|
| 1630 | switch (keypress) {
|
---|
[2725] | 1631 | case KEYCODE_DOWN: case 'e': case 'j': case 0x0d:
|
---|
[1765] | 1632 | buffer_down(1);
|
---|
| 1633 | break;
|
---|
[2725] | 1634 | case KEYCODE_UP: case 'y': case 'k':
|
---|
[1765] | 1635 | buffer_up(1);
|
---|
| 1636 | break;
|
---|
[2725] | 1637 | case KEYCODE_PAGEDOWN: case ' ': case 'z': case 'f':
|
---|
[1765] | 1638 | buffer_down(max_displayed_line + 1);
|
---|
| 1639 | break;
|
---|
[2725] | 1640 | case KEYCODE_PAGEUP: case 'w': case 'b':
|
---|
[1765] | 1641 | buffer_up(max_displayed_line + 1);
|
---|
| 1642 | break;
|
---|
| 1643 | case 'd':
|
---|
| 1644 | buffer_down((max_displayed_line + 1) / 2);
|
---|
| 1645 | break;
|
---|
| 1646 | case 'u':
|
---|
| 1647 | buffer_up((max_displayed_line + 1) / 2);
|
---|
| 1648 | break;
|
---|
[2725] | 1649 | case KEYCODE_HOME: case 'g': case 'p': case '<': case '%':
|
---|
[1765] | 1650 | buffer_line(0);
|
---|
| 1651 | break;
|
---|
[2725] | 1652 | case KEYCODE_END: case 'G': case '>':
|
---|
[1765] | 1653 | cur_fline = MAXLINES;
|
---|
| 1654 | read_lines();
|
---|
| 1655 | buffer_line(cur_fline);
|
---|
| 1656 | break;
|
---|
| 1657 | case 'q': case 'Q':
|
---|
[2725] | 1658 | less_exit(EXIT_SUCCESS);
|
---|
[1765] | 1659 | break;
|
---|
| 1660 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
| 1661 | case 'm':
|
---|
| 1662 | add_mark();
|
---|
| 1663 | buffer_print();
|
---|
| 1664 | break;
|
---|
| 1665 | case '\'':
|
---|
| 1666 | goto_mark();
|
---|
| 1667 | buffer_print();
|
---|
| 1668 | break;
|
---|
[821] | 1669 | #endif
|
---|
[1765] | 1670 | case 'r': case 'R':
|
---|
[3232] | 1671 | /* TODO: (1) also bind ^R, ^L to this?
|
---|
| 1672 | * (2) re-measure window size?
|
---|
| 1673 | */
|
---|
[1765] | 1674 | buffer_print();
|
---|
| 1675 | break;
|
---|
| 1676 | /*case 'R':
|
---|
| 1677 | full_repaint();
|
---|
| 1678 | break;*/
|
---|
| 1679 | case 's':
|
---|
| 1680 | save_input_to_file();
|
---|
| 1681 | break;
|
---|
| 1682 | case 'E':
|
---|
| 1683 | examine_file();
|
---|
| 1684 | break;
|
---|
| 1685 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1686 | case '=':
|
---|
| 1687 | m_status_print();
|
---|
| 1688 | break;
|
---|
[821] | 1689 | #endif
|
---|
[1765] | 1690 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1691 | case '/':
|
---|
| 1692 | option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1693 | regex_process();
|
---|
| 1694 | break;
|
---|
| 1695 | case 'n':
|
---|
| 1696 | goto_match(match_pos + 1);
|
---|
| 1697 | break;
|
---|
| 1698 | case 'N':
|
---|
| 1699 | goto_match(match_pos - 1);
|
---|
| 1700 | break;
|
---|
| 1701 | case '?':
|
---|
| 1702 | option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1703 | regex_process();
|
---|
| 1704 | break;
|
---|
[821] | 1705 | #endif
|
---|
[2725] | 1706 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
[1765] | 1707 | case '-':
|
---|
| 1708 | flag_change();
|
---|
| 1709 | buffer_print();
|
---|
| 1710 | break;
|
---|
[2725] | 1711 | #ifdef BLOAT
|
---|
[1765] | 1712 | case '_':
|
---|
| 1713 | show_flag_status();
|
---|
| 1714 | break;
|
---|
[821] | 1715 | #endif
|
---|
[2725] | 1716 | #endif
|
---|
[1765] | 1717 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
| 1718 | case '{': case '(': case '[':
|
---|
| 1719 | match_right_bracket(keypress);
|
---|
| 1720 | break;
|
---|
| 1721 | case '}': case ')': case ']':
|
---|
| 1722 | match_left_bracket(keypress);
|
---|
| 1723 | break;
|
---|
[821] | 1724 | #endif
|
---|
[1765] | 1725 | case ':':
|
---|
| 1726 | colon_process();
|
---|
| 1727 | break;
|
---|
[821] | 1728 | }
|
---|
| 1729 |
|
---|
| 1730 | if (isdigit(keypress))
|
---|
| 1731 | number_process(keypress);
|
---|
| 1732 | }
|
---|
| 1733 |
|
---|
[2725] | 1734 | static void sig_catcher(int sig)
|
---|
[1765] | 1735 | {
|
---|
[2725] | 1736 | less_exit(- sig);
|
---|
[1765] | 1737 | }
|
---|
[821] | 1738 |
|
---|
[2725] | 1739 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1740 | static void sigwinch_handler(int sig UNUSED_PARAM)
|
---|
| 1741 | {
|
---|
| 1742 | winch_counter++;
|
---|
| 1743 | }
|
---|
| 1744 | #endif
|
---|
| 1745 |
|
---|
| 1746 | int less_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
[1765] | 1747 | int less_main(int argc, char **argv)
|
---|
| 1748 | {
|
---|
[3621] | 1749 | char *tty_name;
|
---|
| 1750 | int tty_fd;
|
---|
| 1751 |
|
---|
[1765] | 1752 | INIT_G();
|
---|
[821] | 1753 |
|
---|
[3621] | 1754 | /* TODO: -x: do not interpret backspace, -xx: tab also
|
---|
| 1755 | * -xxx: newline also
|
---|
| 1756 | * -w N: assume width N (-xxx -w 32: hex viewer of sorts)
|
---|
| 1757 | * -s: condense many empty lines to one
|
---|
| 1758 | * (used by some setups for manpage display)
|
---|
| 1759 | */
|
---|
| 1760 | getopt32(argv, "EMmN~I" IF_FEATURE_LESS_TRUNCATE("S") /*ignored:*/"s");
|
---|
[821] | 1761 | argc -= optind;
|
---|
| 1762 | argv += optind;
|
---|
[1765] | 1763 | num_files = argc;
|
---|
[821] | 1764 | files = argv;
|
---|
| 1765 |
|
---|
[1765] | 1766 | /* Another popular pager, most, detects when stdout
|
---|
| 1767 | * is not a tty and turns into cat. This makes sense. */
|
---|
| 1768 | if (!isatty(STDOUT_FILENO))
|
---|
| 1769 | return bb_cat(argv);
|
---|
| 1770 |
|
---|
[821] | 1771 | if (!num_files) {
|
---|
[1765] | 1772 | if (isatty(STDIN_FILENO)) {
|
---|
| 1773 | /* Just "less"? No args and no redirection? */
|
---|
| 1774 | bb_error_msg("missing filename");
|
---|
[821] | 1775 | bb_show_usage();
|
---|
| 1776 | }
|
---|
[2725] | 1777 | } else {
|
---|
[1765] | 1778 | filename = xstrdup(files[0]);
|
---|
[2725] | 1779 | }
|
---|
[821] | 1780 |
|
---|
[1765] | 1781 | if (option_mask32 & FLAG_TILDE)
|
---|
| 1782 | empty_line_marker = "";
|
---|
| 1783 |
|
---|
[3621] | 1784 | /* Some versions of less can survive w/o controlling tty,
|
---|
| 1785 | * try to do the same. This also allows to specify an alternative
|
---|
| 1786 | * tty via "less 1<>TTY".
|
---|
| 1787 | * We don't try to use STDOUT_FILENO directly,
|
---|
| 1788 | * since we want to set this fd to non-blocking mode,
|
---|
| 1789 | * and not bother with restoring it on exit.
|
---|
| 1790 | */
|
---|
| 1791 | tty_name = xmalloc_ttyname(STDOUT_FILENO);
|
---|
| 1792 | if (tty_name) {
|
---|
| 1793 | tty_fd = open(tty_name, O_RDONLY);
|
---|
| 1794 | free(tty_name);
|
---|
| 1795 | if (tty_fd < 0)
|
---|
| 1796 | goto try_ctty;
|
---|
| 1797 | } else {
|
---|
| 1798 | /* Try controlling tty */
|
---|
| 1799 | try_ctty:
|
---|
| 1800 | tty_fd = open(CURRENT_TTY, O_RDONLY);
|
---|
| 1801 | if (tty_fd < 0)
|
---|
| 1802 | return bb_cat(argv);
|
---|
| 1803 | }
|
---|
| 1804 | ndelay_on(tty_fd);
|
---|
| 1805 | kbd_fd = tty_fd; /* save in a global */
|
---|
[2725] | 1806 |
|
---|
[1765] | 1807 | tcgetattr(kbd_fd, &term_orig);
|
---|
| 1808 | term_less = term_orig;
|
---|
| 1809 | term_less.c_lflag &= ~(ICANON | ECHO);
|
---|
| 1810 | term_less.c_iflag &= ~(IXON | ICRNL);
|
---|
| 1811 | /*term_less.c_oflag &= ~ONLCR;*/
|
---|
| 1812 | term_less.c_cc[VMIN] = 1;
|
---|
| 1813 | term_less.c_cc[VTIME] = 0;
|
---|
| 1814 |
|
---|
[3232] | 1815 | IF_FEATURE_LESS_ASK_TERMINAL(G.winsize_err =) get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
[2725] | 1816 | /* 20: two tabstops + 4 */
|
---|
| 1817 | if (width < 20 || max_displayed_line < 3)
|
---|
| 1818 | return bb_cat(argv);
|
---|
| 1819 | max_displayed_line -= 2;
|
---|
[1765] | 1820 |
|
---|
[2725] | 1821 | /* We want to restore term_orig on exit */
|
---|
| 1822 | bb_signals(BB_FATAL_SIGS, sig_catcher);
|
---|
| 1823 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1824 | signal(SIGWINCH, sigwinch_handler);
|
---|
| 1825 | #endif
|
---|
| 1826 |
|
---|
| 1827 | buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
---|
[1765] | 1828 | reinitialize();
|
---|
[821] | 1829 | while (1) {
|
---|
[3232] | 1830 | int64_t keypress;
|
---|
| 1831 |
|
---|
[2725] | 1832 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1833 | while (WINCH_COUNTER) {
|
---|
| 1834 | again:
|
---|
| 1835 | winch_counter--;
|
---|
[3232] | 1836 | IF_FEATURE_LESS_ASK_TERMINAL(G.winsize_err =) get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
| 1837 | IF_FEATURE_LESS_ASK_TERMINAL(got_size:)
|
---|
[2725] | 1838 | /* 20: two tabstops + 4 */
|
---|
| 1839 | if (width < 20)
|
---|
| 1840 | width = 20;
|
---|
| 1841 | if (max_displayed_line < 3)
|
---|
| 1842 | max_displayed_line = 3;
|
---|
| 1843 | max_displayed_line -= 2;
|
---|
| 1844 | free(buffer);
|
---|
| 1845 | buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
---|
| 1846 | /* Avoid re-wrap and/or redraw if we already know
|
---|
| 1847 | * we need to do it again. These ops are expensive */
|
---|
| 1848 | if (WINCH_COUNTER)
|
---|
| 1849 | goto again;
|
---|
| 1850 | re_wrap();
|
---|
| 1851 | if (WINCH_COUNTER)
|
---|
| 1852 | goto again;
|
---|
| 1853 | buffer_fill_and_print();
|
---|
| 1854 | /* This took some time. Loop back and check,
|
---|
| 1855 | * were there another SIGWINCH? */
|
---|
| 1856 | }
|
---|
[3232] | 1857 | keypress = less_getch(-1); /* -1: do not position cursor */
|
---|
| 1858 | # if ENABLE_FEATURE_LESS_ASK_TERMINAL
|
---|
| 1859 | if ((int32_t)keypress == KEYCODE_CURSOR_POS) {
|
---|
| 1860 | uint32_t rc = (keypress >> 32);
|
---|
| 1861 | width = (rc & 0x7fff);
|
---|
| 1862 | max_displayed_line = ((rc >> 16) & 0x7fff);
|
---|
| 1863 | goto got_size;
|
---|
| 1864 | }
|
---|
| 1865 | # endif
|
---|
| 1866 | #else
|
---|
| 1867 | keypress = less_getch(-1); /* -1: do not position cursor */
|
---|
[2725] | 1868 | #endif
|
---|
[821] | 1869 | keypress_process(keypress);
|
---|
| 1870 | }
|
---|
| 1871 | }
|
---|
[2725] | 1872 |
|
---|
| 1873 | /*
|
---|
| 1874 | Help text of less version 418 is below.
|
---|
| 1875 | If you are implementing something, keeping
|
---|
| 1876 | key and/or command line switch compatibility is a good idea:
|
---|
| 1877 |
|
---|
| 1878 |
|
---|
| 1879 | SUMMARY OF LESS COMMANDS
|
---|
| 1880 |
|
---|
| 1881 | Commands marked with * may be preceded by a number, N.
|
---|
| 1882 | Notes in parentheses indicate the behavior if N is given.
|
---|
| 1883 | h H Display this help.
|
---|
| 1884 | q :q Q :Q ZZ Exit.
|
---|
| 1885 | ---------------------------------------------------------------------------
|
---|
| 1886 | MOVING
|
---|
| 1887 | e ^E j ^N CR * Forward one line (or N lines).
|
---|
| 1888 | y ^Y k ^K ^P * Backward one line (or N lines).
|
---|
| 1889 | f ^F ^V SPACE * Forward one window (or N lines).
|
---|
| 1890 | b ^B ESC-v * Backward one window (or N lines).
|
---|
| 1891 | z * Forward one window (and set window to N).
|
---|
| 1892 | w * Backward one window (and set window to N).
|
---|
| 1893 | ESC-SPACE * Forward one window, but don't stop at end-of-file.
|
---|
| 1894 | d ^D * Forward one half-window (and set half-window to N).
|
---|
| 1895 | u ^U * Backward one half-window (and set half-window to N).
|
---|
| 1896 | ESC-) RightArrow * Left one half screen width (or N positions).
|
---|
| 1897 | ESC-( LeftArrow * Right one half screen width (or N positions).
|
---|
| 1898 | F Forward forever; like "tail -f".
|
---|
| 1899 | r ^R ^L Repaint screen.
|
---|
| 1900 | R Repaint screen, discarding buffered input.
|
---|
| 1901 | ---------------------------------------------------
|
---|
| 1902 | Default "window" is the screen height.
|
---|
| 1903 | Default "half-window" is half of the screen height.
|
---|
| 1904 | ---------------------------------------------------------------------------
|
---|
| 1905 | SEARCHING
|
---|
| 1906 | /pattern * Search forward for (N-th) matching line.
|
---|
| 1907 | ?pattern * Search backward for (N-th) matching line.
|
---|
| 1908 | n * Repeat previous search (for N-th occurrence).
|
---|
| 1909 | N * Repeat previous search in reverse direction.
|
---|
| 1910 | ESC-n * Repeat previous search, spanning files.
|
---|
| 1911 | ESC-N * Repeat previous search, reverse dir. & spanning files.
|
---|
| 1912 | ESC-u Undo (toggle) search highlighting.
|
---|
| 1913 | ---------------------------------------------------
|
---|
| 1914 | Search patterns may be modified by one or more of:
|
---|
| 1915 | ^N or ! Search for NON-matching lines.
|
---|
| 1916 | ^E or * Search multiple files (pass thru END OF FILE).
|
---|
| 1917 | ^F or @ Start search at FIRST file (for /) or last file (for ?).
|
---|
| 1918 | ^K Highlight matches, but don't move (KEEP position).
|
---|
| 1919 | ^R Don't use REGULAR EXPRESSIONS.
|
---|
| 1920 | ---------------------------------------------------------------------------
|
---|
| 1921 | JUMPING
|
---|
| 1922 | g < ESC-< * Go to first line in file (or line N).
|
---|
| 1923 | G > ESC-> * Go to last line in file (or line N).
|
---|
| 1924 | p % * Go to beginning of file (or N percent into file).
|
---|
| 1925 | t * Go to the (N-th) next tag.
|
---|
| 1926 | T * Go to the (N-th) previous tag.
|
---|
| 1927 | { ( [ * Find close bracket } ) ].
|
---|
| 1928 | } ) ] * Find open bracket { ( [.
|
---|
| 1929 | ESC-^F <c1> <c2> * Find close bracket <c2>.
|
---|
| 1930 | ESC-^B <c1> <c2> * Find open bracket <c1>
|
---|
| 1931 | ---------------------------------------------------
|
---|
| 1932 | Each "find close bracket" command goes forward to the close bracket
|
---|
| 1933 | matching the (N-th) open bracket in the top line.
|
---|
| 1934 | Each "find open bracket" command goes backward to the open bracket
|
---|
| 1935 | matching the (N-th) close bracket in the bottom line.
|
---|
| 1936 | m<letter> Mark the current position with <letter>.
|
---|
| 1937 | '<letter> Go to a previously marked position.
|
---|
| 1938 | '' Go to the previous position.
|
---|
| 1939 | ^X^X Same as '.
|
---|
| 1940 | ---------------------------------------------------
|
---|
| 1941 | A mark is any upper-case or lower-case letter.
|
---|
| 1942 | Certain marks are predefined:
|
---|
| 1943 | ^ means beginning of the file
|
---|
| 1944 | $ means end of the file
|
---|
| 1945 | ---------------------------------------------------------------------------
|
---|
| 1946 | CHANGING FILES
|
---|
| 1947 | :e [file] Examine a new file.
|
---|
| 1948 | ^X^V Same as :e.
|
---|
| 1949 | :n * Examine the (N-th) next file from the command line.
|
---|
| 1950 | :p * Examine the (N-th) previous file from the command line.
|
---|
| 1951 | :x * Examine the first (or N-th) file from the command line.
|
---|
| 1952 | :d Delete the current file from the command line list.
|
---|
| 1953 | = ^G :f Print current file name.
|
---|
| 1954 | ---------------------------------------------------------------------------
|
---|
| 1955 | MISCELLANEOUS COMMANDS
|
---|
| 1956 | -<flag> Toggle a command line option [see OPTIONS below].
|
---|
| 1957 | --<name> Toggle a command line option, by name.
|
---|
| 1958 | _<flag> Display the setting of a command line option.
|
---|
| 1959 | __<name> Display the setting of an option, by name.
|
---|
| 1960 | +cmd Execute the less cmd each time a new file is examined.
|
---|
| 1961 | !command Execute the shell command with $SHELL.
|
---|
| 1962 | |Xcommand Pipe file between current pos & mark X to shell command.
|
---|
| 1963 | v Edit the current file with $VISUAL or $EDITOR.
|
---|
| 1964 | V Print version number of "less".
|
---|
| 1965 | ---------------------------------------------------------------------------
|
---|
| 1966 | OPTIONS
|
---|
| 1967 | Most options may be changed either on the command line,
|
---|
| 1968 | or from within less by using the - or -- command.
|
---|
| 1969 | Options may be given in one of two forms: either a single
|
---|
[3621] | 1970 | character preceded by a -, or a name preceded by --.
|
---|
[2725] | 1971 | -? ........ --help
|
---|
| 1972 | Display help (from command line).
|
---|
| 1973 | -a ........ --search-skip-screen
|
---|
| 1974 | Forward search skips current screen.
|
---|
| 1975 | -b [N] .... --buffers=[N]
|
---|
| 1976 | Number of buffers.
|
---|
| 1977 | -B ........ --auto-buffers
|
---|
| 1978 | Don't automatically allocate buffers for pipes.
|
---|
| 1979 | -c ........ --clear-screen
|
---|
| 1980 | Repaint by clearing rather than scrolling.
|
---|
| 1981 | -d ........ --dumb
|
---|
| 1982 | Dumb terminal.
|
---|
| 1983 | -D [xn.n] . --color=xn.n
|
---|
| 1984 | Set screen colors. (MS-DOS only)
|
---|
| 1985 | -e -E .... --quit-at-eof --QUIT-AT-EOF
|
---|
| 1986 | Quit at end of file.
|
---|
| 1987 | -f ........ --force
|
---|
| 1988 | Force open non-regular files.
|
---|
| 1989 | -F ........ --quit-if-one-screen
|
---|
| 1990 | Quit if entire file fits on first screen.
|
---|
| 1991 | -g ........ --hilite-search
|
---|
| 1992 | Highlight only last match for searches.
|
---|
| 1993 | -G ........ --HILITE-SEARCH
|
---|
| 1994 | Don't highlight any matches for searches.
|
---|
| 1995 | -h [N] .... --max-back-scroll=[N]
|
---|
| 1996 | Backward scroll limit.
|
---|
| 1997 | -i ........ --ignore-case
|
---|
| 1998 | Ignore case in searches that do not contain uppercase.
|
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| 1999 | -I ........ --IGNORE-CASE
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| 2000 | Ignore case in all searches.
|
---|
| 2001 | -j [N] .... --jump-target=[N]
|
---|
| 2002 | Screen position of target lines.
|
---|
| 2003 | -J ........ --status-column
|
---|
| 2004 | Display a status column at left edge of screen.
|
---|
| 2005 | -k [file] . --lesskey-file=[file]
|
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| 2006 | Use a lesskey file.
|
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| 2007 | -L ........ --no-lessopen
|
---|
| 2008 | Ignore the LESSOPEN environment variable.
|
---|
| 2009 | -m -M .... --long-prompt --LONG-PROMPT
|
---|
| 2010 | Set prompt style.
|
---|
| 2011 | -n -N .... --line-numbers --LINE-NUMBERS
|
---|
| 2012 | Don't use line numbers.
|
---|
| 2013 | -o [file] . --log-file=[file]
|
---|
| 2014 | Copy to log file (standard input only).
|
---|
| 2015 | -O [file] . --LOG-FILE=[file]
|
---|
| 2016 | Copy to log file (unconditionally overwrite).
|
---|
| 2017 | -p [pattern] --pattern=[pattern]
|
---|
| 2018 | Start at pattern (from command line).
|
---|
| 2019 | -P [prompt] --prompt=[prompt]
|
---|
| 2020 | Define new prompt.
|
---|
| 2021 | -q -Q .... --quiet --QUIET --silent --SILENT
|
---|
| 2022 | Quiet the terminal bell.
|
---|
| 2023 | -r -R .... --raw-control-chars --RAW-CONTROL-CHARS
|
---|
| 2024 | Output "raw" control characters.
|
---|
| 2025 | -s ........ --squeeze-blank-lines
|
---|
| 2026 | Squeeze multiple blank lines.
|
---|
| 2027 | -S ........ --chop-long-lines
|
---|
| 2028 | Chop long lines.
|
---|
| 2029 | -t [tag] .. --tag=[tag]
|
---|
| 2030 | Find a tag.
|
---|
| 2031 | -T [tagsfile] --tag-file=[tagsfile]
|
---|
| 2032 | Use an alternate tags file.
|
---|
| 2033 | -u -U .... --underline-special --UNDERLINE-SPECIAL
|
---|
| 2034 | Change handling of backspaces.
|
---|
| 2035 | -V ........ --version
|
---|
| 2036 | Display the version number of "less".
|
---|
| 2037 | -w ........ --hilite-unread
|
---|
| 2038 | Highlight first new line after forward-screen.
|
---|
| 2039 | -W ........ --HILITE-UNREAD
|
---|
| 2040 | Highlight first new line after any forward movement.
|
---|
| 2041 | -x [N[,...]] --tabs=[N[,...]]
|
---|
| 2042 | Set tab stops.
|
---|
| 2043 | -X ........ --no-init
|
---|
| 2044 | Don't use termcap init/deinit strings.
|
---|
| 2045 | --no-keypad
|
---|
| 2046 | Don't use termcap keypad init/deinit strings.
|
---|
| 2047 | -y [N] .... --max-forw-scroll=[N]
|
---|
| 2048 | Forward scroll limit.
|
---|
| 2049 | -z [N] .... --window=[N]
|
---|
| 2050 | Set size of window.
|
---|
| 2051 | -" [c[c]] . --quotes=[c[c]]
|
---|
| 2052 | Set shell quote characters.
|
---|
| 2053 | -~ ........ --tilde
|
---|
| 2054 | Don't display tildes after end of file.
|
---|
| 2055 | -# [N] .... --shift=[N]
|
---|
| 2056 | Horizontal scroll amount (0 = one half screen width)
|
---|
| 2057 |
|
---|
| 2058 | ---------------------------------------------------------------------------
|
---|
| 2059 | LINE EDITING
|
---|
| 2060 | These keys can be used to edit text being entered
|
---|
| 2061 | on the "command line" at the bottom of the screen.
|
---|
| 2062 | RightArrow ESC-l Move cursor right one character.
|
---|
| 2063 | LeftArrow ESC-h Move cursor left one character.
|
---|
| 2064 | CNTL-RightArrow ESC-RightArrow ESC-w Move cursor right one word.
|
---|
| 2065 | CNTL-LeftArrow ESC-LeftArrow ESC-b Move cursor left one word.
|
---|
| 2066 | HOME ESC-0 Move cursor to start of line.
|
---|
| 2067 | END ESC-$ Move cursor to end of line.
|
---|
| 2068 | BACKSPACE Delete char to left of cursor.
|
---|
| 2069 | DELETE ESC-x Delete char under cursor.
|
---|
| 2070 | CNTL-BACKSPACE ESC-BACKSPACE Delete word to left of cursor.
|
---|
| 2071 | CNTL-DELETE ESC-DELETE ESC-X Delete word under cursor.
|
---|
| 2072 | CNTL-U ESC (MS-DOS only) Delete entire line.
|
---|
| 2073 | UpArrow ESC-k Retrieve previous command line.
|
---|
| 2074 | DownArrow ESC-j Retrieve next command line.
|
---|
| 2075 | TAB Complete filename & cycle.
|
---|
| 2076 | SHIFT-TAB ESC-TAB Complete filename & reverse cycle.
|
---|
| 2077 | CNTL-L Complete filename, list all.
|
---|
| 2078 | */
|
---|