[3320] | 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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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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| 10 | /*
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| 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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| 18 | *
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| 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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| 23 |
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| 24 | #include <sched.h> /* sched_yield() */
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| 25 |
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| 26 | #include "libbb.h"
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| 27 | #if ENABLE_FEATURE_LESS_REGEXP
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| 28 | #include "xregex.h"
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| 29 | #endif
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| 30 |
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| 31 |
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| 32 | #define ESC "\033"
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| 33 | /* The escape codes for highlighted and normal text */
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| 34 | #define HIGHLIGHT ESC"[7m"
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| 35 | #define NORMAL ESC"[0m"
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| 36 | /* The escape code to home and clear to the end of screen */
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| 37 | #define CLEAR ESC"[H\033[J"
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| 38 | /* The escape code to clear to the end of line */
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| 39 | #define CLEAR_2_EOL ESC"[K"
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| 40 |
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| 41 | enum {
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| 42 | /* Absolute max of lines eaten */
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| 43 | MAXLINES = CONFIG_FEATURE_LESS_MAXLINES,
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| 44 | /* This many "after the end" lines we will show (at max) */
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| 45 | TILDES = 1,
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| 46 | };
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| 47 |
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| 48 | /* Command line options */
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| 49 | enum {
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| 50 | FLAG_E = 1 << 0,
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| 51 | FLAG_M = 1 << 1,
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| 52 | FLAG_m = 1 << 2,
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| 53 | FLAG_N = 1 << 3,
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| 54 | FLAG_TILDE = 1 << 4,
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| 55 | FLAG_I = 1 << 5,
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| 56 | FLAG_S = (1 << 6) * ENABLE_FEATURE_LESS_DASHCMD,
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| 57 | /* hijack command line options variable for internal state vars */
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| 58 | LESS_STATE_MATCH_BACKWARDS = 1 << 15,
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| 59 | };
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| 60 |
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| 61 | #if !ENABLE_FEATURE_LESS_REGEXP
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| 62 | enum { pattern_valid = 0 };
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| 63 | #endif
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| 64 |
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| 65 | struct globals {
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| 66 | int cur_fline; /* signed */
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| 67 | int kbd_fd; /* fd to get input from */
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| 68 | int less_gets_pos;
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| 69 | /* last position in last line, taking into account tabs */
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| 70 | size_t last_line_pos;
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| 71 | unsigned max_fline;
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| 72 | unsigned max_lineno; /* this one tracks linewrap */
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| 73 | unsigned max_displayed_line;
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| 74 | unsigned width;
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| 75 | #if ENABLE_FEATURE_LESS_WINCH
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| 76 | unsigned winch_counter;
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| 77 | #endif
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| 78 | ssize_t eof_error; /* eof if 0, error if < 0 */
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| 79 | ssize_t readpos;
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| 80 | ssize_t readeof; /* must be signed */
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| 81 | const char **buffer;
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| 82 | const char **flines;
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| 83 | const char *empty_line_marker;
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| 84 | unsigned num_files;
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| 85 | unsigned current_file;
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| 86 | char *filename;
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| 87 | char **files;
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| 88 | #if ENABLE_FEATURE_LESS_MARKS
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| 89 | unsigned num_marks;
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| 90 | unsigned mark_lines[15][2];
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| 91 | #endif
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| 92 | #if ENABLE_FEATURE_LESS_REGEXP
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| 93 | unsigned *match_lines;
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| 94 | int match_pos; /* signed! */
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| 95 | int wanted_match; /* signed! */
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| 96 | int num_matches;
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| 97 | regex_t pattern;
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| 98 | smallint pattern_valid;
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| 99 | #endif
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| 100 | smallint terminated;
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| 101 | struct termios term_orig, term_less;
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| 102 | char kbd_input[KEYCODE_BUFFER_SIZE];
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| 103 | };
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| 104 | #define G (*ptr_to_globals)
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| 105 | #define cur_fline (G.cur_fline )
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| 106 | #define kbd_fd (G.kbd_fd )
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| 107 | #define less_gets_pos (G.less_gets_pos )
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| 108 | #define last_line_pos (G.last_line_pos )
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| 109 | #define max_fline (G.max_fline )
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| 110 | #define max_lineno (G.max_lineno )
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| 111 | #define max_displayed_line (G.max_displayed_line)
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| 112 | #define width (G.width )
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| 113 | #define winch_counter (G.winch_counter )
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| 114 | /* This one is 100% not cached by compiler on read access */
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| 115 | #define WINCH_COUNTER (*(volatile unsigned *)&winch_counter)
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| 116 | #define eof_error (G.eof_error )
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| 117 | #define readpos (G.readpos )
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| 118 | #define readeof (G.readeof )
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| 119 | #define buffer (G.buffer )
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| 120 | #define flines (G.flines )
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| 121 | #define empty_line_marker (G.empty_line_marker )
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| 122 | #define num_files (G.num_files )
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| 123 | #define current_file (G.current_file )
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| 124 | #define filename (G.filename )
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| 125 | #define files (G.files )
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| 126 | #define num_marks (G.num_marks )
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| 127 | #define mark_lines (G.mark_lines )
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| 128 | #if ENABLE_FEATURE_LESS_REGEXP
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| 129 | #define match_lines (G.match_lines )
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| 130 | #define match_pos (G.match_pos )
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| 131 | #define num_matches (G.num_matches )
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| 132 | #define wanted_match (G.wanted_match )
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| 133 | #define pattern (G.pattern )
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| 134 | #define pattern_valid (G.pattern_valid )
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| 135 | #endif
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| 136 | #define terminated (G.terminated )
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| 137 | #define term_orig (G.term_orig )
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| 138 | #define term_less (G.term_less )
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| 139 | #define kbd_input (G.kbd_input )
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| 140 | #define INIT_G() do { \
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| 141 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 142 | less_gets_pos = -1; \
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| 143 | empty_line_marker = "~"; \
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| 144 | num_files = 1; \
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| 145 | current_file = 1; \
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| 146 | eof_error = 1; \
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| 147 | terminated = 1; \
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| 148 | IF_FEATURE_LESS_REGEXP(wanted_match = -1;) \
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| 149 | } while (0)
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| 150 |
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| 151 | /* flines[] are lines read from stdin, each in malloc'ed buffer.
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| 152 | * Line numbers are stored as uint32_t prepended to each line.
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| 153 | * Pointer is adjusted so that flines[i] points directly past
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| 154 | * line number. Accesor: */
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| 155 | #define MEMPTR(p) ((char*)(p) - 4)
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| 156 | #define LINENO(p) (*(uint32_t*)((p) - 4))
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| 157 |
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| 158 |
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| 159 | /* Reset terminal input to normal */
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| 160 | static void set_tty_cooked(void)
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| 161 | {
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| 162 | fflush_all();
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| 163 | tcsetattr(kbd_fd, TCSANOW, &term_orig);
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| 164 | }
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| 165 |
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| 166 | /* Move the cursor to a position (x,y), where (0,0) is the
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| 167 | top-left corner of the console */
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| 168 | static void move_cursor(int line, int row)
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| 169 | {
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| 170 | printf(ESC"[%u;%uH", line, row);
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| 171 | }
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| 172 |
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| 173 | static void clear_line(void)
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| 174 | {
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| 175 | printf(ESC"[%u;0H" CLEAR_2_EOL, max_displayed_line + 2);
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| 176 | }
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| 177 |
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| 178 | static void print_hilite(const char *str)
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| 179 | {
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| 180 | printf(HIGHLIGHT"%s"NORMAL, str);
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| 181 | }
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| 182 |
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| 183 | static void print_statusline(const char *str)
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| 184 | {
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| 185 | clear_line();
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| 186 | printf(HIGHLIGHT"%.*s"NORMAL, width - 1, str);
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| 187 | }
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| 188 |
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| 189 | /* Exit the program gracefully */
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| 190 | static void less_exit(int code)
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| 191 | {
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| 192 | set_tty_cooked();
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| 193 | clear_line();
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| 194 | if (code < 0)
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| 195 | kill_myself_with_sig(- code); /* does not return */
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| 196 | exit(code);
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| 197 | }
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| 198 |
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| 199 | #if (ENABLE_FEATURE_LESS_DASHCMD && ENABLE_FEATURE_LESS_LINENUMS) \
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| 200 | || ENABLE_FEATURE_LESS_WINCH
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| 201 | static void re_wrap(void)
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| 202 | {
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| 203 | int w = width;
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| 204 | int new_line_pos;
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| 205 | int src_idx;
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| 206 | int dst_idx;
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| 207 | int new_cur_fline = 0;
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| 208 | uint32_t lineno;
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| 209 | char linebuf[w + 1];
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| 210 | const char **old_flines = flines;
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| 211 | const char *s;
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| 212 | char **new_flines = NULL;
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| 213 | char *d;
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| 214 |
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| 215 | if (option_mask32 & FLAG_N)
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| 216 | w -= 8;
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| 217 |
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| 218 | src_idx = 0;
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| 219 | dst_idx = 0;
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| 220 | s = old_flines[0];
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| 221 | lineno = LINENO(s);
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| 222 | d = linebuf;
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| 223 | new_line_pos = 0;
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| 224 | while (1) {
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| 225 | *d = *s;
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| 226 | if (*d != '\0') {
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| 227 | new_line_pos++;
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| 228 | if (*d == '\t') /* tab */
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| 229 | new_line_pos += 7;
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| 230 | s++;
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| 231 | d++;
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| 232 | if (new_line_pos >= w) {
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| 233 | int sz;
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| 234 | /* new line is full, create next one */
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| 235 | *d = '\0';
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| 236 | next_new:
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| 237 | sz = (d - linebuf) + 1; /* + 1: NUL */
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| 238 | d = ((char*)xmalloc(sz + 4)) + 4;
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| 239 | LINENO(d) = lineno;
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| 240 | memcpy(d, linebuf, sz);
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| 241 | new_flines = xrealloc_vector(new_flines, 8, dst_idx);
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| 242 | new_flines[dst_idx] = d;
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| 243 | dst_idx++;
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| 244 | if (new_line_pos < w) {
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| 245 | /* if we came here thru "goto next_new" */
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| 246 | if (src_idx > max_fline)
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| 247 | break;
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| 248 | lineno = LINENO(s);
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| 249 | }
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| 250 | d = linebuf;
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| 251 | new_line_pos = 0;
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| 252 | }
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| 253 | continue;
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| 254 | }
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| 255 | /* *d == NUL: old line ended, go to next old one */
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| 256 | free(MEMPTR(old_flines[src_idx]));
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| 257 | /* btw, convert cur_fline... */
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| 258 | if (cur_fline == src_idx)
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| 259 | new_cur_fline = dst_idx;
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| 260 | src_idx++;
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| 261 | /* no more lines? finish last new line (and exit the loop) */
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| 262 | if (src_idx > max_fline)
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| 263 | goto next_new;
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| 264 | s = old_flines[src_idx];
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| 265 | if (lineno != LINENO(s)) {
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| 266 | /* this is not a continuation line!
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| 267 | * create next _new_ line too */
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| 268 | goto next_new;
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| 269 | }
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| 270 | }
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| 271 |
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| 272 | free(old_flines);
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| 273 | flines = (const char **)new_flines;
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| 274 |
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| 275 | max_fline = dst_idx - 1;
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| 276 | last_line_pos = new_line_pos;
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| 277 | cur_fline = new_cur_fline;
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| 278 | /* max_lineno is screen-size independent */
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| 279 | #if ENABLE_FEATURE_LESS_REGEXP
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| 280 | pattern_valid = 0;
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| 281 | #endif
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| 282 | }
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| 283 | #endif
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| 284 |
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| 285 | #if ENABLE_FEATURE_LESS_REGEXP
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| 286 | static void fill_match_lines(unsigned pos);
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| 287 | #else
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| 288 | #define fill_match_lines(pos) ((void)0)
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| 289 | #endif
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| 290 |
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| 291 | /* Devilishly complex routine.
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| 292 | *
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| 293 | * Has to deal with EOF and EPIPE on input,
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| 294 | * with line wrapping, with last line not ending in '\n'
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| 295 | * (possibly not ending YET!), with backspace and tabs.
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| 296 | * It reads input again if last time we got an EOF (thus supporting
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| 297 | * growing files) or EPIPE (watching output of slow process like make).
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| 298 | *
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| 299 | * Variables used:
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| 300 | * flines[] - array of lines already read. Linewrap may cause
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| 301 | * one source file line to occupy several flines[n].
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| 302 | * flines[max_fline] - last line, possibly incomplete.
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| 303 | * terminated - 1 if flines[max_fline] is 'terminated'
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| 304 | * (if there was '\n' [which isn't stored itself, we just remember
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| 305 | * that it was seen])
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| 306 | * max_lineno - last line's number, this one doesn't increment
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| 307 | * on line wrap, only on "real" new lines.
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| 308 | * readbuf[0..readeof-1] - small preliminary buffer.
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| 309 | * readbuf[readpos] - next character to add to current line.
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| 310 | * last_line_pos - screen line position of next char to be read
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| 311 | * (takes into account tabs and backspaces)
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| 312 | * eof_error - < 0 error, == 0 EOF, > 0 not EOF/error
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| 313 | */
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| 314 | static void read_lines(void)
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| 315 | {
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| 316 | #define readbuf bb_common_bufsiz1
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| 317 | char *current_line, *p;
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| 318 | int w = width;
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| 319 | char last_terminated = terminated;
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| 320 | #if ENABLE_FEATURE_LESS_REGEXP
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| 321 | unsigned old_max_fline = max_fline;
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| 322 | time_t last_time = 0;
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| 323 | unsigned seconds_p1 = 3; /* seconds_to_loop + 1 */
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| 324 | #endif
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| 325 |
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| 326 | if (option_mask32 & FLAG_N)
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| 327 | w -= 8;
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| 328 |
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| 329 | IF_FEATURE_LESS_REGEXP(again0:)
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| 330 |
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| 331 | p = current_line = ((char*)xmalloc(w + 4)) + 4;
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| 332 | max_fline += last_terminated;
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| 333 | if (!last_terminated) {
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| 334 | const char *cp = flines[max_fline];
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| 335 | strcpy(p, cp);
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| 336 | p += strlen(current_line);
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| 337 | free(MEMPTR(flines[max_fline]));
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| 338 | /* last_line_pos is still valid from previous read_lines() */
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| 339 | } else {
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| 340 | last_line_pos = 0;
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| 341 | }
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| 342 |
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| 343 | while (1) { /* read lines until we reach cur_fline or wanted_match */
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| 344 | *p = '\0';
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| 345 | terminated = 0;
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| 346 | while (1) { /* read chars until we have a line */
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| 347 | char c;
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| 348 | /* if no unprocessed chars left, eat more */
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| 349 | if (readpos >= readeof) {
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| 350 | ndelay_on(0);
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| 351 | eof_error = safe_read(STDIN_FILENO, readbuf, sizeof(readbuf));
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| 352 | ndelay_off(0);
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| 353 | readpos = 0;
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| 354 | readeof = eof_error;
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| 355 | if (eof_error <= 0)
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| 356 | goto reached_eof;
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| 357 | }
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| 358 | c = readbuf[readpos];
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| 359 | /* backspace? [needed for manpages] */
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| 360 | /* <tab><bs> is (a) insane and */
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| 361 | /* (b) harder to do correctly, so we refuse to do it */
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| 362 | if (c == '\x8' && last_line_pos && p[-1] != '\t') {
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| 363 | readpos++; /* eat it */
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| 364 | last_line_pos--;
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| 365 | /* was buggy (p could end up <= current_line)... */
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| 366 | *--p = '\0';
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| 367 | continue;
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| 368 | }
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| 369 | {
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| 370 | size_t new_last_line_pos = last_line_pos + 1;
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| 371 | if (c == '\t') {
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| 372 | new_last_line_pos += 7;
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| 373 | new_last_line_pos &= (~7);
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| 374 | }
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| 375 | if ((int)new_last_line_pos >= w)
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| 376 | break;
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| 377 | last_line_pos = new_last_line_pos;
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| 378 | }
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| 379 | /* ok, we will eat this char */
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| 380 | readpos++;
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| 381 | if (c == '\n') {
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| 382 | terminated = 1;
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| 383 | last_line_pos = 0;
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| 384 | break;
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| 385 | }
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| 386 | /* NUL is substituted by '\n'! */
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| 387 | if (c == '\0') c = '\n';
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| 388 | *p++ = c;
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| 389 | *p = '\0';
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| 390 | } /* end of "read chars until we have a line" loop */
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| 391 | /* Corner case: linewrap with only "" wrapping to next line */
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| 392 | /* Looks ugly on screen, so we do not store this empty line */
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| 393 | if (!last_terminated && !current_line[0]) {
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| 394 | last_terminated = 1;
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| 395 | max_lineno++;
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| 396 | continue;
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| 397 | }
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| 398 | reached_eof:
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| 399 | last_terminated = terminated;
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| 400 | flines = xrealloc_vector(flines, 8, max_fline);
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| 401 |
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| 402 | flines[max_fline] = (char*)xrealloc(MEMPTR(current_line), strlen(current_line) + 1 + 4) + 4;
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| 403 | LINENO(flines[max_fline]) = max_lineno;
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| 404 | if (terminated)
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| 405 | max_lineno++;
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| 406 |
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| 407 | if (max_fline >= MAXLINES) {
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| 408 | eof_error = 0; /* Pretend we saw EOF */
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| 409 | break;
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| 410 | }
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| 411 | if (!(option_mask32 & FLAG_S)
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| 412 | ? (max_fline > cur_fline + max_displayed_line)
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| 413 | : (max_fline >= cur_fline
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| 414 | && max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
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| 415 | ) {
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| 416 | #if !ENABLE_FEATURE_LESS_REGEXP
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| 417 | break;
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| 418 | #else
|
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| 419 | if (wanted_match >= num_matches) { /* goto_match called us */
|
---|
| 420 | fill_match_lines(old_max_fline);
|
---|
| 421 | old_max_fline = max_fline;
|
---|
| 422 | }
|
---|
| 423 | if (wanted_match < num_matches)
|
---|
| 424 | break;
|
---|
| 425 | #endif
|
---|
| 426 | }
|
---|
| 427 | if (eof_error <= 0) {
|
---|
| 428 | if (eof_error < 0) {
|
---|
| 429 | if (errno == EAGAIN) {
|
---|
| 430 | /* not yet eof or error, reset flag (or else
|
---|
| 431 | * we will hog CPU - select() will return
|
---|
| 432 | * immediately */
|
---|
| 433 | eof_error = 1;
|
---|
| 434 | } else {
|
---|
| 435 | print_statusline(bb_msg_read_error);
|
---|
| 436 | }
|
---|
| 437 | }
|
---|
| 438 | #if !ENABLE_FEATURE_LESS_REGEXP
|
---|
| 439 | break;
|
---|
| 440 | #else
|
---|
| 441 | if (wanted_match < num_matches) {
|
---|
| 442 | break;
|
---|
| 443 | } else { /* goto_match called us */
|
---|
| 444 | time_t t = time(NULL);
|
---|
| 445 | if (t != last_time) {
|
---|
| 446 | last_time = t;
|
---|
| 447 | if (--seconds_p1 == 0)
|
---|
| 448 | break;
|
---|
| 449 | }
|
---|
| 450 | sched_yield();
|
---|
| 451 | goto again0; /* go loop again (max 2 seconds) */
|
---|
| 452 | }
|
---|
| 453 | #endif
|
---|
| 454 | }
|
---|
| 455 | max_fline++;
|
---|
| 456 | current_line = ((char*)xmalloc(w + 4)) + 4;
|
---|
| 457 | p = current_line;
|
---|
| 458 | last_line_pos = 0;
|
---|
| 459 | } /* end of "read lines until we reach cur_fline" loop */
|
---|
| 460 | fill_match_lines(old_max_fline);
|
---|
| 461 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 462 | /* prevent us from being stuck in search for a match */
|
---|
| 463 | wanted_match = -1;
|
---|
| 464 | #endif
|
---|
| 465 | #undef readbuf
|
---|
| 466 | }
|
---|
| 467 |
|
---|
| 468 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 469 | /* Interestingly, writing calc_percent as a function saves around 32 bytes
|
---|
| 470 | * on my build. */
|
---|
| 471 | static int calc_percent(void)
|
---|
| 472 | {
|
---|
| 473 | unsigned p = (100 * (cur_fline+max_displayed_line+1) + max_fline/2) / (max_fline+1);
|
---|
| 474 | return p <= 100 ? p : 100;
|
---|
| 475 | }
|
---|
| 476 |
|
---|
| 477 | /* Print a status line if -M was specified */
|
---|
| 478 | static void m_status_print(void)
|
---|
| 479 | {
|
---|
| 480 | int percentage;
|
---|
| 481 |
|
---|
| 482 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
| 483 | return;
|
---|
| 484 |
|
---|
| 485 | clear_line();
|
---|
| 486 | printf(HIGHLIGHT"%s", filename);
|
---|
| 487 | if (num_files > 1)
|
---|
| 488 | printf(" (file %i of %i)", current_file, num_files);
|
---|
| 489 | printf(" lines %i-%i/%i ",
|
---|
| 490 | cur_fline + 1, cur_fline + max_displayed_line + 1,
|
---|
| 491 | max_fline + 1);
|
---|
| 492 | if (cur_fline >= (int)(max_fline - max_displayed_line)) {
|
---|
| 493 | printf("(END)"NORMAL);
|
---|
| 494 | if (num_files > 1 && current_file != num_files)
|
---|
| 495 | printf(HIGHLIGHT" - next: %s"NORMAL, files[current_file]);
|
---|
| 496 | return;
|
---|
| 497 | }
|
---|
| 498 | percentage = calc_percent();
|
---|
| 499 | printf("%i%%"NORMAL, percentage);
|
---|
| 500 | }
|
---|
| 501 | #endif
|
---|
| 502 |
|
---|
| 503 | /* Print the status line */
|
---|
| 504 | static void status_print(void)
|
---|
| 505 | {
|
---|
| 506 | const char *p;
|
---|
| 507 |
|
---|
| 508 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
| 509 | return;
|
---|
| 510 |
|
---|
| 511 | /* Change the status if flags have been set */
|
---|
| 512 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 513 | if (option_mask32 & (FLAG_M|FLAG_m)) {
|
---|
| 514 | m_status_print();
|
---|
| 515 | return;
|
---|
| 516 | }
|
---|
| 517 | /* No flags set */
|
---|
| 518 | #endif
|
---|
| 519 |
|
---|
| 520 | clear_line();
|
---|
| 521 | if (cur_fline && cur_fline < (int)(max_fline - max_displayed_line)) {
|
---|
| 522 | bb_putchar(':');
|
---|
| 523 | return;
|
---|
| 524 | }
|
---|
| 525 | p = "(END)";
|
---|
| 526 | if (!cur_fline)
|
---|
| 527 | p = filename;
|
---|
| 528 | if (num_files > 1) {
|
---|
| 529 | printf(HIGHLIGHT"%s (file %i of %i)"NORMAL,
|
---|
| 530 | p, current_file, num_files);
|
---|
| 531 | return;
|
---|
| 532 | }
|
---|
| 533 | print_hilite(p);
|
---|
| 534 | }
|
---|
| 535 |
|
---|
| 536 | static void cap_cur_fline(int nlines)
|
---|
| 537 | {
|
---|
| 538 | int diff;
|
---|
| 539 | if (cur_fline < 0)
|
---|
| 540 | cur_fline = 0;
|
---|
| 541 | if (cur_fline + max_displayed_line > max_fline + TILDES) {
|
---|
| 542 | cur_fline -= nlines;
|
---|
| 543 | if (cur_fline < 0)
|
---|
| 544 | cur_fline = 0;
|
---|
| 545 | diff = max_fline - (cur_fline + max_displayed_line) + TILDES;
|
---|
| 546 | /* As the number of lines requested was too large, we just move
|
---|
| 547 | * to the end of the file */
|
---|
| 548 | if (diff > 0)
|
---|
| 549 | cur_fline += diff;
|
---|
| 550 | }
|
---|
| 551 | }
|
---|
| 552 |
|
---|
| 553 | static const char controls[] ALIGN1 =
|
---|
| 554 | /* NUL: never encountered; TAB: not converted */
|
---|
| 555 | /**/"\x01\x02\x03\x04\x05\x06\x07\x08" "\x0a\x0b\x0c\x0d\x0e\x0f"
|
---|
| 556 | "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
|
---|
| 557 | "\x7f\x9b"; /* DEL and infamous Meta-ESC :( */
|
---|
| 558 | static const char ctrlconv[] ALIGN1 =
|
---|
| 559 | /* why 40 instead of 4a below? - it is a replacement for '\n'.
|
---|
| 560 | * '\n' is a former NUL - we subst it with @, not J */
|
---|
| 561 | "\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x40\x4b\x4c\x4d\x4e\x4f"
|
---|
| 562 | "\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f";
|
---|
| 563 |
|
---|
| 564 | static void lineno_str(char *nbuf9, const char *line)
|
---|
| 565 | {
|
---|
| 566 | nbuf9[0] = '\0';
|
---|
| 567 | if (option_mask32 & FLAG_N) {
|
---|
| 568 | const char *fmt;
|
---|
| 569 | unsigned n;
|
---|
| 570 |
|
---|
| 571 | if (line == empty_line_marker) {
|
---|
| 572 | memset(nbuf9, ' ', 8);
|
---|
| 573 | nbuf9[8] = '\0';
|
---|
| 574 | return;
|
---|
| 575 | }
|
---|
| 576 | /* Width of 7 preserves tab spacing in the text */
|
---|
| 577 | fmt = "%7u ";
|
---|
| 578 | n = LINENO(line) + 1;
|
---|
| 579 | if (n > 9999999) {
|
---|
| 580 | n %= 10000000;
|
---|
| 581 | fmt = "%07u ";
|
---|
| 582 | }
|
---|
| 583 | sprintf(nbuf9, fmt, n);
|
---|
| 584 | }
|
---|
| 585 | }
|
---|
| 586 |
|
---|
| 587 |
|
---|
| 588 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 589 | static void print_found(const char *line)
|
---|
| 590 | {
|
---|
| 591 | int match_status;
|
---|
| 592 | int eflags;
|
---|
| 593 | char *growline;
|
---|
| 594 | regmatch_t match_structs;
|
---|
| 595 |
|
---|
| 596 | char buf[width];
|
---|
| 597 | char nbuf9[9];
|
---|
| 598 | const char *str = line;
|
---|
| 599 | char *p = buf;
|
---|
| 600 | size_t n;
|
---|
| 601 |
|
---|
| 602 | while (*str) {
|
---|
| 603 | n = strcspn(str, controls);
|
---|
| 604 | if (n) {
|
---|
| 605 | if (!str[n]) break;
|
---|
| 606 | memcpy(p, str, n);
|
---|
| 607 | p += n;
|
---|
| 608 | str += n;
|
---|
| 609 | }
|
---|
| 610 | n = strspn(str, controls);
|
---|
| 611 | memset(p, '.', n);
|
---|
| 612 | p += n;
|
---|
| 613 | str += n;
|
---|
| 614 | }
|
---|
| 615 | strcpy(p, str);
|
---|
| 616 |
|
---|
| 617 | /* buf[] holds quarantined version of str */
|
---|
| 618 |
|
---|
| 619 | /* Each part of the line that matches has the HIGHLIGHT
|
---|
| 620 | and NORMAL escape sequences placed around it.
|
---|
| 621 | NB: we regex against line, but insert text
|
---|
| 622 | from quarantined copy (buf[]) */
|
---|
| 623 | str = buf;
|
---|
| 624 | growline = NULL;
|
---|
| 625 | eflags = 0;
|
---|
| 626 | goto start;
|
---|
| 627 |
|
---|
| 628 | while (match_status == 0) {
|
---|
| 629 | char *new = xasprintf("%s%.*s"HIGHLIGHT"%.*s"NORMAL,
|
---|
| 630 | growline ? growline : "",
|
---|
| 631 | match_structs.rm_so, str,
|
---|
| 632 | match_structs.rm_eo - match_structs.rm_so,
|
---|
| 633 | str + match_structs.rm_so);
|
---|
| 634 | free(growline);
|
---|
| 635 | growline = new;
|
---|
| 636 | str += match_structs.rm_eo;
|
---|
| 637 | line += match_structs.rm_eo;
|
---|
| 638 | eflags = REG_NOTBOL;
|
---|
| 639 | start:
|
---|
| 640 | /* Most of the time doesn't find the regex, optimize for that */
|
---|
| 641 | match_status = regexec(&pattern, line, 1, &match_structs, eflags);
|
---|
| 642 | /* if even "" matches, treat it as "not a match" */
|
---|
| 643 | if (match_structs.rm_so >= match_structs.rm_eo)
|
---|
| 644 | match_status = 1;
|
---|
| 645 | }
|
---|
| 646 |
|
---|
| 647 | lineno_str(nbuf9, line);
|
---|
| 648 | if (!growline) {
|
---|
| 649 | printf(CLEAR_2_EOL"%s%s\n", nbuf9, str);
|
---|
| 650 | return;
|
---|
| 651 | }
|
---|
| 652 | printf(CLEAR_2_EOL"%s%s%s\n", nbuf9, growline, str);
|
---|
| 653 | free(growline);
|
---|
| 654 | }
|
---|
| 655 | #else
|
---|
| 656 | void print_found(const char *line);
|
---|
| 657 | #endif
|
---|
| 658 |
|
---|
| 659 | static void print_ascii(const char *str)
|
---|
| 660 | {
|
---|
| 661 | char buf[width];
|
---|
| 662 | char nbuf9[9];
|
---|
| 663 | char *p;
|
---|
| 664 | size_t n;
|
---|
| 665 |
|
---|
| 666 | lineno_str(nbuf9, str);
|
---|
| 667 | printf(CLEAR_2_EOL"%s", nbuf9);
|
---|
| 668 |
|
---|
| 669 | while (*str) {
|
---|
| 670 | n = strcspn(str, controls);
|
---|
| 671 | if (n) {
|
---|
| 672 | if (!str[n]) break;
|
---|
| 673 | printf("%.*s", (int) n, str);
|
---|
| 674 | str += n;
|
---|
| 675 | }
|
---|
| 676 | n = strspn(str, controls);
|
---|
| 677 | p = buf;
|
---|
| 678 | do {
|
---|
| 679 | if (*str == 0x7f)
|
---|
| 680 | *p++ = '?';
|
---|
| 681 | else if (*str == (char)0x9b)
|
---|
| 682 | /* VT100's CSI, aka Meta-ESC. Who's inventor? */
|
---|
| 683 | /* I want to know who committed this sin */
|
---|
| 684 | *p++ = '{';
|
---|
| 685 | else
|
---|
| 686 | *p++ = ctrlconv[(unsigned char)*str];
|
---|
| 687 | str++;
|
---|
| 688 | } while (--n);
|
---|
| 689 | *p = '\0';
|
---|
| 690 | print_hilite(buf);
|
---|
| 691 | }
|
---|
| 692 | puts(str);
|
---|
| 693 | }
|
---|
| 694 |
|
---|
| 695 | /* Print the buffer */
|
---|
| 696 | static void buffer_print(void)
|
---|
| 697 | {
|
---|
| 698 | unsigned i;
|
---|
| 699 |
|
---|
| 700 | move_cursor(0, 0);
|
---|
| 701 | for (i = 0; i <= max_displayed_line; i++)
|
---|
| 702 | if (pattern_valid)
|
---|
| 703 | print_found(buffer[i]);
|
---|
| 704 | else
|
---|
| 705 | print_ascii(buffer[i]);
|
---|
| 706 | status_print();
|
---|
| 707 | }
|
---|
| 708 |
|
---|
| 709 | static void buffer_fill_and_print(void)
|
---|
| 710 | {
|
---|
| 711 | unsigned i;
|
---|
| 712 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
| 713 | int fpos = cur_fline;
|
---|
| 714 |
|
---|
| 715 | if (option_mask32 & FLAG_S) {
|
---|
| 716 | /* Go back to the beginning of this line */
|
---|
| 717 | while (fpos && LINENO(flines[fpos]) == LINENO(flines[fpos-1]))
|
---|
| 718 | fpos--;
|
---|
| 719 | }
|
---|
| 720 |
|
---|
| 721 | i = 0;
|
---|
| 722 | while (i <= max_displayed_line && fpos <= max_fline) {
|
---|
| 723 | int lineno = LINENO(flines[fpos]);
|
---|
| 724 | buffer[i] = flines[fpos];
|
---|
| 725 | i++;
|
---|
| 726 | do {
|
---|
| 727 | fpos++;
|
---|
| 728 | } while ((fpos <= max_fline)
|
---|
| 729 | && (option_mask32 & FLAG_S)
|
---|
| 730 | && lineno == LINENO(flines[fpos])
|
---|
| 731 | );
|
---|
| 732 | }
|
---|
| 733 | #else
|
---|
| 734 | for (i = 0; i <= max_displayed_line && cur_fline + i <= max_fline; i++) {
|
---|
| 735 | buffer[i] = flines[cur_fline + i];
|
---|
| 736 | }
|
---|
| 737 | #endif
|
---|
| 738 | for (; i <= max_displayed_line; i++) {
|
---|
| 739 | buffer[i] = empty_line_marker;
|
---|
| 740 | }
|
---|
| 741 | buffer_print();
|
---|
| 742 | }
|
---|
| 743 |
|
---|
| 744 | /* Move the buffer up and down in the file in order to scroll */
|
---|
| 745 | static void buffer_down(int nlines)
|
---|
| 746 | {
|
---|
| 747 | cur_fline += nlines;
|
---|
| 748 | read_lines();
|
---|
| 749 | cap_cur_fline(nlines);
|
---|
| 750 | buffer_fill_and_print();
|
---|
| 751 | }
|
---|
| 752 |
|
---|
| 753 | static void buffer_up(int nlines)
|
---|
| 754 | {
|
---|
| 755 | cur_fline -= nlines;
|
---|
| 756 | if (cur_fline < 0) cur_fline = 0;
|
---|
| 757 | read_lines();
|
---|
| 758 | buffer_fill_and_print();
|
---|
| 759 | }
|
---|
| 760 |
|
---|
| 761 | static void buffer_line(int linenum)
|
---|
| 762 | {
|
---|
| 763 | if (linenum < 0)
|
---|
| 764 | linenum = 0;
|
---|
| 765 | cur_fline = linenum;
|
---|
| 766 | read_lines();
|
---|
| 767 | if (linenum + max_displayed_line > max_fline)
|
---|
| 768 | linenum = max_fline - max_displayed_line + TILDES;
|
---|
| 769 | if (linenum < 0)
|
---|
| 770 | linenum = 0;
|
---|
| 771 | cur_fline = linenum;
|
---|
| 772 | buffer_fill_and_print();
|
---|
| 773 | }
|
---|
| 774 |
|
---|
| 775 | static void open_file_and_read_lines(void)
|
---|
| 776 | {
|
---|
| 777 | if (filename) {
|
---|
| 778 | xmove_fd(xopen(filename, O_RDONLY), STDIN_FILENO);
|
---|
| 779 | } else {
|
---|
| 780 | /* "less" with no arguments in argv[] */
|
---|
| 781 | /* For status line only */
|
---|
| 782 | filename = xstrdup(bb_msg_standard_input);
|
---|
| 783 | }
|
---|
| 784 | readpos = 0;
|
---|
| 785 | readeof = 0;
|
---|
| 786 | last_line_pos = 0;
|
---|
| 787 | terminated = 1;
|
---|
| 788 | read_lines();
|
---|
| 789 | }
|
---|
| 790 |
|
---|
| 791 | /* Reinitialize everything for a new file - free the memory and start over */
|
---|
| 792 | static void reinitialize(void)
|
---|
| 793 | {
|
---|
| 794 | unsigned i;
|
---|
| 795 |
|
---|
| 796 | if (flines) {
|
---|
| 797 | for (i = 0; i <= max_fline; i++)
|
---|
| 798 | free(MEMPTR(flines[i]));
|
---|
| 799 | free(flines);
|
---|
| 800 | flines = NULL;
|
---|
| 801 | }
|
---|
| 802 |
|
---|
| 803 | max_fline = -1;
|
---|
| 804 | cur_fline = 0;
|
---|
| 805 | max_lineno = 0;
|
---|
| 806 | open_file_and_read_lines();
|
---|
| 807 | buffer_fill_and_print();
|
---|
| 808 | }
|
---|
| 809 |
|
---|
| 810 | static int getch_nowait(void)
|
---|
| 811 | {
|
---|
| 812 | int rd;
|
---|
| 813 | struct pollfd pfd[2];
|
---|
| 814 |
|
---|
| 815 | pfd[0].fd = STDIN_FILENO;
|
---|
| 816 | pfd[0].events = POLLIN;
|
---|
| 817 | pfd[1].fd = kbd_fd;
|
---|
| 818 | pfd[1].events = POLLIN;
|
---|
| 819 | again:
|
---|
| 820 | tcsetattr(kbd_fd, TCSANOW, &term_less);
|
---|
| 821 | /* NB: select/poll returns whenever read will not block. Therefore:
|
---|
| 822 | * if eof is reached, select/poll will return immediately
|
---|
| 823 | * because read will immediately return 0 bytes.
|
---|
| 824 | * Even if select/poll says that input is available, read CAN block
|
---|
| 825 | * (switch fd into O_NONBLOCK'ed mode to avoid it)
|
---|
| 826 | */
|
---|
| 827 | rd = 1;
|
---|
| 828 | /* Are we interested in stdin? */
|
---|
| 829 | //TODO: reuse code for determining this
|
---|
| 830 | if (!(option_mask32 & FLAG_S)
|
---|
| 831 | ? !(max_fline > cur_fline + max_displayed_line)
|
---|
| 832 | : !(max_fline >= cur_fline
|
---|
| 833 | && max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
|
---|
| 834 | ) {
|
---|
| 835 | if (eof_error > 0) /* did NOT reach eof yet */
|
---|
| 836 | rd = 0; /* yes, we are interested in stdin */
|
---|
| 837 | }
|
---|
| 838 | /* Position cursor if line input is done */
|
---|
| 839 | if (less_gets_pos >= 0)
|
---|
| 840 | move_cursor(max_displayed_line + 2, less_gets_pos + 1);
|
---|
| 841 | fflush_all();
|
---|
| 842 |
|
---|
| 843 | if (kbd_input[0] == 0) { /* if nothing is buffered */
|
---|
| 844 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 845 | while (1) {
|
---|
| 846 | int r;
|
---|
| 847 | /* NB: SIGWINCH interrupts poll() */
|
---|
| 848 | r = poll(pfd + rd, 2 - rd, -1);
|
---|
| 849 | if (/*r < 0 && errno == EINTR &&*/ winch_counter)
|
---|
| 850 | return '\\'; /* anything which has no defined function */
|
---|
| 851 | if (r) break;
|
---|
| 852 | }
|
---|
| 853 | #else
|
---|
| 854 | safe_poll(pfd + rd, 2 - rd, -1);
|
---|
| 855 | #endif
|
---|
| 856 | }
|
---|
| 857 |
|
---|
| 858 | /* We have kbd_fd in O_NONBLOCK mode, read inside read_key()
|
---|
| 859 | * would not block even if there is no input available */
|
---|
| 860 | rd = read_key(kbd_fd, kbd_input, /*timeout off:*/ -2);
|
---|
| 861 | if (rd == -1) {
|
---|
| 862 | if (errno == EAGAIN) {
|
---|
| 863 | /* No keyboard input available. Since poll() did return,
|
---|
| 864 | * we should have input on stdin */
|
---|
| 865 | read_lines();
|
---|
| 866 | buffer_fill_and_print();
|
---|
| 867 | goto again;
|
---|
| 868 | }
|
---|
| 869 | /* EOF/error (ssh session got killed etc) */
|
---|
| 870 | less_exit(0);
|
---|
| 871 | }
|
---|
| 872 | set_tty_cooked();
|
---|
| 873 | return rd;
|
---|
| 874 | }
|
---|
| 875 |
|
---|
| 876 | /* Grab a character from input without requiring the return key.
|
---|
| 877 | * May return KEYCODE_xxx values.
|
---|
| 878 | * Note that this function works best with raw input. */
|
---|
| 879 | static int less_getch(int pos)
|
---|
| 880 | {
|
---|
| 881 | int i;
|
---|
| 882 |
|
---|
| 883 | again:
|
---|
| 884 | less_gets_pos = pos;
|
---|
| 885 | i = getch_nowait();
|
---|
| 886 | less_gets_pos = -1;
|
---|
| 887 |
|
---|
| 888 | /* Discard Ctrl-something chars */
|
---|
| 889 | if (i >= 0 && i < ' ' && i != 0x0d && i != 8)
|
---|
| 890 | goto again;
|
---|
| 891 | return i;
|
---|
| 892 | }
|
---|
| 893 |
|
---|
| 894 | static char* less_gets(int sz)
|
---|
| 895 | {
|
---|
| 896 | int c;
|
---|
| 897 | unsigned i = 0;
|
---|
| 898 | char *result = xzalloc(1);
|
---|
| 899 |
|
---|
| 900 | while (1) {
|
---|
| 901 | c = '\0';
|
---|
| 902 | less_gets_pos = sz + i;
|
---|
| 903 | c = getch_nowait();
|
---|
| 904 | if (c == 0x0d) {
|
---|
| 905 | result[i] = '\0';
|
---|
| 906 | less_gets_pos = -1;
|
---|
| 907 | return result;
|
---|
| 908 | }
|
---|
| 909 | if (c == 0x7f)
|
---|
| 910 | c = 8;
|
---|
| 911 | if (c == 8 && i) {
|
---|
| 912 | printf("\x8 \x8");
|
---|
| 913 | i--;
|
---|
| 914 | }
|
---|
| 915 | if (c < ' ') /* filters out KEYCODE_xxx too (<0) */
|
---|
| 916 | continue;
|
---|
| 917 | if (i >= width - sz - 1)
|
---|
| 918 | continue; /* len limit */
|
---|
| 919 | bb_putchar(c);
|
---|
| 920 | result[i++] = c;
|
---|
| 921 | result = xrealloc(result, i+1);
|
---|
| 922 | }
|
---|
| 923 | }
|
---|
| 924 |
|
---|
| 925 | static void examine_file(void)
|
---|
| 926 | {
|
---|
| 927 | char *new_fname;
|
---|
| 928 |
|
---|
| 929 | print_statusline("Examine: ");
|
---|
| 930 | new_fname = less_gets(sizeof("Examine: ") - 1);
|
---|
| 931 | if (!new_fname[0]) {
|
---|
| 932 | status_print();
|
---|
| 933 | err:
|
---|
| 934 | free(new_fname);
|
---|
| 935 | return;
|
---|
| 936 | }
|
---|
| 937 | if (access(new_fname, R_OK) != 0) {
|
---|
| 938 | print_statusline("Cannot read this file");
|
---|
| 939 | goto err;
|
---|
| 940 | }
|
---|
| 941 | free(filename);
|
---|
| 942 | filename = new_fname;
|
---|
| 943 | /* files start by = argv. why we assume that argv is infinitely long??
|
---|
| 944 | files[num_files] = filename;
|
---|
| 945 | current_file = num_files + 1;
|
---|
| 946 | num_files++; */
|
---|
| 947 | files[0] = filename;
|
---|
| 948 | num_files = current_file = 1;
|
---|
| 949 | reinitialize();
|
---|
| 950 | }
|
---|
| 951 |
|
---|
| 952 | /* This function changes the file currently being paged. direction can be one of the following:
|
---|
| 953 | * -1: go back one file
|
---|
| 954 | * 0: go to the first file
|
---|
| 955 | * 1: go forward one file */
|
---|
| 956 | static void change_file(int direction)
|
---|
| 957 | {
|
---|
| 958 | if (current_file != ((direction > 0) ? num_files : 1)) {
|
---|
| 959 | current_file = direction ? current_file + direction : 1;
|
---|
| 960 | free(filename);
|
---|
| 961 | filename = xstrdup(files[current_file - 1]);
|
---|
| 962 | reinitialize();
|
---|
| 963 | } else {
|
---|
| 964 | print_statusline(direction > 0 ? "No next file" : "No previous file");
|
---|
| 965 | }
|
---|
| 966 | }
|
---|
| 967 |
|
---|
| 968 | static void remove_current_file(void)
|
---|
| 969 | {
|
---|
| 970 | unsigned i;
|
---|
| 971 |
|
---|
| 972 | if (num_files < 2)
|
---|
| 973 | return;
|
---|
| 974 |
|
---|
| 975 | if (current_file != 1) {
|
---|
| 976 | change_file(-1);
|
---|
| 977 | for (i = 3; i <= num_files; i++)
|
---|
| 978 | files[i - 2] = files[i - 1];
|
---|
| 979 | num_files--;
|
---|
| 980 | } else {
|
---|
| 981 | change_file(1);
|
---|
| 982 | for (i = 2; i <= num_files; i++)
|
---|
| 983 | files[i - 2] = files[i - 1];
|
---|
| 984 | num_files--;
|
---|
| 985 | current_file--;
|
---|
| 986 | }
|
---|
| 987 | }
|
---|
| 988 |
|
---|
| 989 | static void colon_process(void)
|
---|
| 990 | {
|
---|
| 991 | int keypress;
|
---|
| 992 |
|
---|
| 993 | /* Clear the current line and print a prompt */
|
---|
| 994 | print_statusline(" :");
|
---|
| 995 |
|
---|
| 996 | keypress = less_getch(2);
|
---|
| 997 | switch (keypress) {
|
---|
| 998 | case 'd':
|
---|
| 999 | remove_current_file();
|
---|
| 1000 | break;
|
---|
| 1001 | case 'e':
|
---|
| 1002 | examine_file();
|
---|
| 1003 | break;
|
---|
| 1004 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1005 | case 'f':
|
---|
| 1006 | m_status_print();
|
---|
| 1007 | break;
|
---|
| 1008 | #endif
|
---|
| 1009 | case 'n':
|
---|
| 1010 | change_file(1);
|
---|
| 1011 | break;
|
---|
| 1012 | case 'p':
|
---|
| 1013 | change_file(-1);
|
---|
| 1014 | break;
|
---|
| 1015 | case 'q':
|
---|
| 1016 | less_exit(EXIT_SUCCESS);
|
---|
| 1017 | break;
|
---|
| 1018 | case 'x':
|
---|
| 1019 | change_file(0);
|
---|
| 1020 | break;
|
---|
| 1021 | }
|
---|
| 1022 | }
|
---|
| 1023 |
|
---|
| 1024 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1025 | static void normalize_match_pos(int match)
|
---|
| 1026 | {
|
---|
| 1027 | if (match >= num_matches)
|
---|
| 1028 | match = num_matches - 1;
|
---|
| 1029 | if (match < 0)
|
---|
| 1030 | match = 0;
|
---|
| 1031 | match_pos = match;
|
---|
| 1032 | }
|
---|
| 1033 |
|
---|
| 1034 | static void goto_match(int match)
|
---|
| 1035 | {
|
---|
| 1036 | if (!pattern_valid)
|
---|
| 1037 | return;
|
---|
| 1038 | if (match < 0)
|
---|
| 1039 | match = 0;
|
---|
| 1040 | /* Try to find next match if eof isn't reached yet */
|
---|
| 1041 | if (match >= num_matches && eof_error > 0) {
|
---|
| 1042 | wanted_match = match; /* "I want to read until I see N'th match" */
|
---|
| 1043 | read_lines();
|
---|
| 1044 | }
|
---|
| 1045 | if (num_matches) {
|
---|
| 1046 | normalize_match_pos(match);
|
---|
| 1047 | buffer_line(match_lines[match_pos]);
|
---|
| 1048 | } else {
|
---|
| 1049 | print_statusline("No matches found");
|
---|
| 1050 | }
|
---|
| 1051 | }
|
---|
| 1052 |
|
---|
| 1053 | static void fill_match_lines(unsigned pos)
|
---|
| 1054 | {
|
---|
| 1055 | if (!pattern_valid)
|
---|
| 1056 | return;
|
---|
| 1057 | /* Run the regex on each line of the current file */
|
---|
| 1058 | while (pos <= max_fline) {
|
---|
| 1059 | /* If this line matches */
|
---|
| 1060 | if (regexec(&pattern, flines[pos], 0, NULL, 0) == 0
|
---|
| 1061 | /* and we didn't match it last time */
|
---|
| 1062 | && !(num_matches && match_lines[num_matches-1] == pos)
|
---|
| 1063 | ) {
|
---|
| 1064 | match_lines = xrealloc_vector(match_lines, 4, num_matches);
|
---|
| 1065 | match_lines[num_matches++] = pos;
|
---|
| 1066 | }
|
---|
| 1067 | pos++;
|
---|
| 1068 | }
|
---|
| 1069 | }
|
---|
| 1070 |
|
---|
| 1071 | static void regex_process(void)
|
---|
| 1072 | {
|
---|
| 1073 | char *uncomp_regex, *err;
|
---|
| 1074 |
|
---|
| 1075 | /* Reset variables */
|
---|
| 1076 | free(match_lines);
|
---|
| 1077 | match_lines = NULL;
|
---|
| 1078 | match_pos = 0;
|
---|
| 1079 | num_matches = 0;
|
---|
| 1080 | if (pattern_valid) {
|
---|
| 1081 | regfree(&pattern);
|
---|
| 1082 | pattern_valid = 0;
|
---|
| 1083 | }
|
---|
| 1084 |
|
---|
| 1085 | /* Get the uncompiled regular expression from the user */
|
---|
| 1086 | clear_line();
|
---|
| 1087 | bb_putchar((option_mask32 & LESS_STATE_MATCH_BACKWARDS) ? '?' : '/');
|
---|
| 1088 | uncomp_regex = less_gets(1);
|
---|
| 1089 | if (!uncomp_regex[0]) {
|
---|
| 1090 | free(uncomp_regex);
|
---|
| 1091 | buffer_print();
|
---|
| 1092 | return;
|
---|
| 1093 | }
|
---|
| 1094 |
|
---|
| 1095 | /* Compile the regex and check for errors */
|
---|
| 1096 | err = regcomp_or_errmsg(&pattern, uncomp_regex,
|
---|
| 1097 | (option_mask32 & FLAG_I) ? REG_ICASE : 0);
|
---|
| 1098 | free(uncomp_regex);
|
---|
| 1099 | if (err) {
|
---|
| 1100 | print_statusline(err);
|
---|
| 1101 | free(err);
|
---|
| 1102 | return;
|
---|
| 1103 | }
|
---|
| 1104 |
|
---|
| 1105 | pattern_valid = 1;
|
---|
| 1106 | match_pos = 0;
|
---|
| 1107 | fill_match_lines(0);
|
---|
| 1108 | while (match_pos < num_matches) {
|
---|
| 1109 | if ((int)match_lines[match_pos] > cur_fline)
|
---|
| 1110 | break;
|
---|
| 1111 | match_pos++;
|
---|
| 1112 | }
|
---|
| 1113 | if (option_mask32 & LESS_STATE_MATCH_BACKWARDS)
|
---|
| 1114 | match_pos--;
|
---|
| 1115 |
|
---|
| 1116 | /* It's possible that no matches are found yet.
|
---|
| 1117 | * goto_match() will read input looking for match,
|
---|
| 1118 | * if needed */
|
---|
| 1119 | goto_match(match_pos);
|
---|
| 1120 | }
|
---|
| 1121 | #endif
|
---|
| 1122 |
|
---|
| 1123 | static void number_process(int first_digit)
|
---|
| 1124 | {
|
---|
| 1125 | unsigned i;
|
---|
| 1126 | int num;
|
---|
| 1127 | int keypress;
|
---|
| 1128 | char num_input[sizeof(int)*4]; /* more than enough */
|
---|
| 1129 |
|
---|
| 1130 | num_input[0] = first_digit;
|
---|
| 1131 |
|
---|
| 1132 | /* Clear the current line, print a prompt, and then print the digit */
|
---|
| 1133 | clear_line();
|
---|
| 1134 | printf(":%c", first_digit);
|
---|
| 1135 |
|
---|
| 1136 | /* Receive input until a letter is given */
|
---|
| 1137 | i = 1;
|
---|
| 1138 | while (i < sizeof(num_input)-1) {
|
---|
| 1139 | keypress = less_getch(i + 1);
|
---|
| 1140 | if ((unsigned)keypress > 255 || !isdigit(num_input[i]))
|
---|
| 1141 | break;
|
---|
| 1142 | num_input[i] = keypress;
|
---|
| 1143 | bb_putchar(keypress);
|
---|
| 1144 | i++;
|
---|
| 1145 | }
|
---|
| 1146 |
|
---|
| 1147 | num_input[i] = '\0';
|
---|
| 1148 | num = bb_strtou(num_input, NULL, 10);
|
---|
| 1149 | /* on format error, num == -1 */
|
---|
| 1150 | if (num < 1 || num > MAXLINES) {
|
---|
| 1151 | buffer_print();
|
---|
| 1152 | return;
|
---|
| 1153 | }
|
---|
| 1154 |
|
---|
| 1155 | /* We now know the number and the letter entered, so we process them */
|
---|
| 1156 | switch (keypress) {
|
---|
| 1157 | case KEYCODE_DOWN: case 'z': case 'd': case 'e': case ' ': case '\015':
|
---|
| 1158 | buffer_down(num);
|
---|
| 1159 | break;
|
---|
| 1160 | case KEYCODE_UP: case 'b': case 'w': case 'y': case 'u':
|
---|
| 1161 | buffer_up(num);
|
---|
| 1162 | break;
|
---|
| 1163 | case 'g': case '<': case 'G': case '>':
|
---|
| 1164 | cur_fline = num + max_displayed_line;
|
---|
| 1165 | read_lines();
|
---|
| 1166 | buffer_line(num - 1);
|
---|
| 1167 | break;
|
---|
| 1168 | case 'p': case '%':
|
---|
| 1169 | num = num * (max_fline / 100); /* + max_fline / 2; */
|
---|
| 1170 | cur_fline = num + max_displayed_line;
|
---|
| 1171 | read_lines();
|
---|
| 1172 | buffer_line(num);
|
---|
| 1173 | break;
|
---|
| 1174 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1175 | case 'n':
|
---|
| 1176 | goto_match(match_pos + num);
|
---|
| 1177 | break;
|
---|
| 1178 | case '/':
|
---|
| 1179 | option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1180 | regex_process();
|
---|
| 1181 | break;
|
---|
| 1182 | case '?':
|
---|
| 1183 | option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1184 | regex_process();
|
---|
| 1185 | break;
|
---|
| 1186 | #endif
|
---|
| 1187 | }
|
---|
| 1188 | }
|
---|
| 1189 |
|
---|
| 1190 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
| 1191 | static void flag_change(void)
|
---|
| 1192 | {
|
---|
| 1193 | int keypress;
|
---|
| 1194 |
|
---|
| 1195 | clear_line();
|
---|
| 1196 | bb_putchar('-');
|
---|
| 1197 | keypress = less_getch(1);
|
---|
| 1198 |
|
---|
| 1199 | switch (keypress) {
|
---|
| 1200 | case 'M':
|
---|
| 1201 | option_mask32 ^= FLAG_M;
|
---|
| 1202 | break;
|
---|
| 1203 | case 'm':
|
---|
| 1204 | option_mask32 ^= FLAG_m;
|
---|
| 1205 | break;
|
---|
| 1206 | case 'E':
|
---|
| 1207 | option_mask32 ^= FLAG_E;
|
---|
| 1208 | break;
|
---|
| 1209 | case '~':
|
---|
| 1210 | option_mask32 ^= FLAG_TILDE;
|
---|
| 1211 | break;
|
---|
| 1212 | case 'S':
|
---|
| 1213 | option_mask32 ^= FLAG_S;
|
---|
| 1214 | buffer_fill_and_print();
|
---|
| 1215 | break;
|
---|
| 1216 | #if ENABLE_FEATURE_LESS_LINENUMS
|
---|
| 1217 | case 'N':
|
---|
| 1218 | option_mask32 ^= FLAG_N;
|
---|
| 1219 | re_wrap();
|
---|
| 1220 | buffer_fill_and_print();
|
---|
| 1221 | break;
|
---|
| 1222 | #endif
|
---|
| 1223 | }
|
---|
| 1224 | }
|
---|
| 1225 |
|
---|
| 1226 | #ifdef BLOAT
|
---|
| 1227 | static void show_flag_status(void)
|
---|
| 1228 | {
|
---|
| 1229 | int keypress;
|
---|
| 1230 | int flag_val;
|
---|
| 1231 |
|
---|
| 1232 | clear_line();
|
---|
| 1233 | bb_putchar('_');
|
---|
| 1234 | keypress = less_getch(1);
|
---|
| 1235 |
|
---|
| 1236 | switch (keypress) {
|
---|
| 1237 | case 'M':
|
---|
| 1238 | flag_val = option_mask32 & FLAG_M;
|
---|
| 1239 | break;
|
---|
| 1240 | case 'm':
|
---|
| 1241 | flag_val = option_mask32 & FLAG_m;
|
---|
| 1242 | break;
|
---|
| 1243 | case '~':
|
---|
| 1244 | flag_val = option_mask32 & FLAG_TILDE;
|
---|
| 1245 | break;
|
---|
| 1246 | case 'N':
|
---|
| 1247 | flag_val = option_mask32 & FLAG_N;
|
---|
| 1248 | break;
|
---|
| 1249 | case 'E':
|
---|
| 1250 | flag_val = option_mask32 & FLAG_E;
|
---|
| 1251 | break;
|
---|
| 1252 | default:
|
---|
| 1253 | flag_val = 0;
|
---|
| 1254 | break;
|
---|
| 1255 | }
|
---|
| 1256 |
|
---|
| 1257 | clear_line();
|
---|
| 1258 | printf(HIGHLIGHT"The status of the flag is: %u"NORMAL, flag_val != 0);
|
---|
| 1259 | }
|
---|
| 1260 | #endif
|
---|
| 1261 |
|
---|
| 1262 | #endif /* ENABLE_FEATURE_LESS_DASHCMD */
|
---|
| 1263 |
|
---|
| 1264 | static void save_input_to_file(void)
|
---|
| 1265 | {
|
---|
| 1266 | const char *msg = "";
|
---|
| 1267 | char *current_line;
|
---|
| 1268 | unsigned i;
|
---|
| 1269 | FILE *fp;
|
---|
| 1270 |
|
---|
| 1271 | print_statusline("Log file: ");
|
---|
| 1272 | current_line = less_gets(sizeof("Log file: ")-1);
|
---|
| 1273 | if (current_line[0]) {
|
---|
| 1274 | fp = fopen_for_write(current_line);
|
---|
| 1275 | if (!fp) {
|
---|
| 1276 | msg = "Error opening log file";
|
---|
| 1277 | goto ret;
|
---|
| 1278 | }
|
---|
| 1279 | for (i = 0; i <= max_fline; i++)
|
---|
| 1280 | fprintf(fp, "%s\n", flines[i]);
|
---|
| 1281 | fclose(fp);
|
---|
| 1282 | msg = "Done";
|
---|
| 1283 | }
|
---|
| 1284 | ret:
|
---|
| 1285 | print_statusline(msg);
|
---|
| 1286 | free(current_line);
|
---|
| 1287 | }
|
---|
| 1288 |
|
---|
| 1289 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
| 1290 | static void add_mark(void)
|
---|
| 1291 | {
|
---|
| 1292 | int letter;
|
---|
| 1293 |
|
---|
| 1294 | print_statusline("Mark: ");
|
---|
| 1295 | letter = less_getch(sizeof("Mark: ") - 1);
|
---|
| 1296 |
|
---|
| 1297 | if (isalpha(letter)) {
|
---|
| 1298 | /* If we exceed 15 marks, start overwriting previous ones */
|
---|
| 1299 | if (num_marks == 14)
|
---|
| 1300 | num_marks = 0;
|
---|
| 1301 |
|
---|
| 1302 | mark_lines[num_marks][0] = letter;
|
---|
| 1303 | mark_lines[num_marks][1] = cur_fline;
|
---|
| 1304 | num_marks++;
|
---|
| 1305 | } else {
|
---|
| 1306 | print_statusline("Invalid mark letter");
|
---|
| 1307 | }
|
---|
| 1308 | }
|
---|
| 1309 |
|
---|
| 1310 | static void goto_mark(void)
|
---|
| 1311 | {
|
---|
| 1312 | int letter;
|
---|
| 1313 | int i;
|
---|
| 1314 |
|
---|
| 1315 | print_statusline("Go to mark: ");
|
---|
| 1316 | letter = less_getch(sizeof("Go to mark: ") - 1);
|
---|
| 1317 | clear_line();
|
---|
| 1318 |
|
---|
| 1319 | if (isalpha(letter)) {
|
---|
| 1320 | for (i = 0; i <= num_marks; i++)
|
---|
| 1321 | if (letter == mark_lines[i][0]) {
|
---|
| 1322 | buffer_line(mark_lines[i][1]);
|
---|
| 1323 | break;
|
---|
| 1324 | }
|
---|
| 1325 | if (num_marks == 14 && letter != mark_lines[14][0])
|
---|
| 1326 | print_statusline("Mark not set");
|
---|
| 1327 | } else
|
---|
| 1328 | print_statusline("Invalid mark letter");
|
---|
| 1329 | }
|
---|
| 1330 | #endif
|
---|
| 1331 |
|
---|
| 1332 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
| 1333 | static char opp_bracket(char bracket)
|
---|
| 1334 | {
|
---|
| 1335 | switch (bracket) {
|
---|
| 1336 | case '{': case '[': /* '}' == '{' + 2. Same for '[' */
|
---|
| 1337 | bracket++;
|
---|
| 1338 | case '(': /* ')' == '(' + 1 */
|
---|
| 1339 | bracket++;
|
---|
| 1340 | break;
|
---|
| 1341 | case '}': case ']':
|
---|
| 1342 | bracket--;
|
---|
| 1343 | case ')':
|
---|
| 1344 | bracket--;
|
---|
| 1345 | break;
|
---|
| 1346 | };
|
---|
| 1347 | return bracket;
|
---|
| 1348 | }
|
---|
| 1349 |
|
---|
| 1350 | static void match_right_bracket(char bracket)
|
---|
| 1351 | {
|
---|
| 1352 | unsigned i;
|
---|
| 1353 |
|
---|
| 1354 | if (strchr(flines[cur_fline], bracket) == NULL) {
|
---|
| 1355 | print_statusline("No bracket in top line");
|
---|
| 1356 | return;
|
---|
| 1357 | }
|
---|
| 1358 | bracket = opp_bracket(bracket);
|
---|
| 1359 | for (i = cur_fline + 1; i < max_fline; i++) {
|
---|
| 1360 | if (strchr(flines[i], bracket) != NULL) {
|
---|
| 1361 | buffer_line(i);
|
---|
| 1362 | return;
|
---|
| 1363 | }
|
---|
| 1364 | }
|
---|
| 1365 | print_statusline("No matching bracket found");
|
---|
| 1366 | }
|
---|
| 1367 |
|
---|
| 1368 | static void match_left_bracket(char bracket)
|
---|
| 1369 | {
|
---|
| 1370 | int i;
|
---|
| 1371 |
|
---|
| 1372 | if (strchr(flines[cur_fline + max_displayed_line], bracket) == NULL) {
|
---|
| 1373 | print_statusline("No bracket in bottom line");
|
---|
| 1374 | return;
|
---|
| 1375 | }
|
---|
| 1376 |
|
---|
| 1377 | bracket = opp_bracket(bracket);
|
---|
| 1378 | for (i = cur_fline + max_displayed_line; i >= 0; i--) {
|
---|
| 1379 | if (strchr(flines[i], bracket) != NULL) {
|
---|
| 1380 | buffer_line(i);
|
---|
| 1381 | return;
|
---|
| 1382 | }
|
---|
| 1383 | }
|
---|
| 1384 | print_statusline("No matching bracket found");
|
---|
| 1385 | }
|
---|
| 1386 | #endif /* FEATURE_LESS_BRACKETS */
|
---|
| 1387 |
|
---|
| 1388 | static void keypress_process(int keypress)
|
---|
| 1389 | {
|
---|
| 1390 | switch (keypress) {
|
---|
| 1391 | case KEYCODE_DOWN: case 'e': case 'j': case 0x0d:
|
---|
| 1392 | buffer_down(1);
|
---|
| 1393 | break;
|
---|
| 1394 | case KEYCODE_UP: case 'y': case 'k':
|
---|
| 1395 | buffer_up(1);
|
---|
| 1396 | break;
|
---|
| 1397 | case KEYCODE_PAGEDOWN: case ' ': case 'z': case 'f':
|
---|
| 1398 | buffer_down(max_displayed_line + 1);
|
---|
| 1399 | break;
|
---|
| 1400 | case KEYCODE_PAGEUP: case 'w': case 'b':
|
---|
| 1401 | buffer_up(max_displayed_line + 1);
|
---|
| 1402 | break;
|
---|
| 1403 | case 'd':
|
---|
| 1404 | buffer_down((max_displayed_line + 1) / 2);
|
---|
| 1405 | break;
|
---|
| 1406 | case 'u':
|
---|
| 1407 | buffer_up((max_displayed_line + 1) / 2);
|
---|
| 1408 | break;
|
---|
| 1409 | case KEYCODE_HOME: case 'g': case 'p': case '<': case '%':
|
---|
| 1410 | buffer_line(0);
|
---|
| 1411 | break;
|
---|
| 1412 | case KEYCODE_END: case 'G': case '>':
|
---|
| 1413 | cur_fline = MAXLINES;
|
---|
| 1414 | read_lines();
|
---|
| 1415 | buffer_line(cur_fline);
|
---|
| 1416 | break;
|
---|
| 1417 | case 'q': case 'Q':
|
---|
| 1418 | less_exit(EXIT_SUCCESS);
|
---|
| 1419 | break;
|
---|
| 1420 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
| 1421 | case 'm':
|
---|
| 1422 | add_mark();
|
---|
| 1423 | buffer_print();
|
---|
| 1424 | break;
|
---|
| 1425 | case '\'':
|
---|
| 1426 | goto_mark();
|
---|
| 1427 | buffer_print();
|
---|
| 1428 | break;
|
---|
| 1429 | #endif
|
---|
| 1430 | case 'r': case 'R':
|
---|
| 1431 | buffer_print();
|
---|
| 1432 | break;
|
---|
| 1433 | /*case 'R':
|
---|
| 1434 | full_repaint();
|
---|
| 1435 | break;*/
|
---|
| 1436 | case 's':
|
---|
| 1437 | save_input_to_file();
|
---|
| 1438 | break;
|
---|
| 1439 | case 'E':
|
---|
| 1440 | examine_file();
|
---|
| 1441 | break;
|
---|
| 1442 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1443 | case '=':
|
---|
| 1444 | m_status_print();
|
---|
| 1445 | break;
|
---|
| 1446 | #endif
|
---|
| 1447 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1448 | case '/':
|
---|
| 1449 | option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1450 | regex_process();
|
---|
| 1451 | break;
|
---|
| 1452 | case 'n':
|
---|
| 1453 | goto_match(match_pos + 1);
|
---|
| 1454 | break;
|
---|
| 1455 | case 'N':
|
---|
| 1456 | goto_match(match_pos - 1);
|
---|
| 1457 | break;
|
---|
| 1458 | case '?':
|
---|
| 1459 | option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1460 | regex_process();
|
---|
| 1461 | break;
|
---|
| 1462 | #endif
|
---|
| 1463 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
| 1464 | case '-':
|
---|
| 1465 | flag_change();
|
---|
| 1466 | buffer_print();
|
---|
| 1467 | break;
|
---|
| 1468 | #ifdef BLOAT
|
---|
| 1469 | case '_':
|
---|
| 1470 | show_flag_status();
|
---|
| 1471 | break;
|
---|
| 1472 | #endif
|
---|
| 1473 | #endif
|
---|
| 1474 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
| 1475 | case '{': case '(': case '[':
|
---|
| 1476 | match_right_bracket(keypress);
|
---|
| 1477 | break;
|
---|
| 1478 | case '}': case ')': case ']':
|
---|
| 1479 | match_left_bracket(keypress);
|
---|
| 1480 | break;
|
---|
| 1481 | #endif
|
---|
| 1482 | case ':':
|
---|
| 1483 | colon_process();
|
---|
| 1484 | break;
|
---|
| 1485 | }
|
---|
| 1486 |
|
---|
| 1487 | if (isdigit(keypress))
|
---|
| 1488 | number_process(keypress);
|
---|
| 1489 | }
|
---|
| 1490 |
|
---|
| 1491 | static void sig_catcher(int sig)
|
---|
| 1492 | {
|
---|
| 1493 | less_exit(- sig);
|
---|
| 1494 | }
|
---|
| 1495 |
|
---|
| 1496 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1497 | static void sigwinch_handler(int sig UNUSED_PARAM)
|
---|
| 1498 | {
|
---|
| 1499 | winch_counter++;
|
---|
| 1500 | }
|
---|
| 1501 | #endif
|
---|
| 1502 |
|
---|
| 1503 | int less_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1504 | int less_main(int argc, char **argv)
|
---|
| 1505 | {
|
---|
| 1506 | int keypress;
|
---|
| 1507 |
|
---|
| 1508 | INIT_G();
|
---|
| 1509 |
|
---|
| 1510 | /* TODO: -x: do not interpret backspace, -xx: tab also */
|
---|
| 1511 | /* -xxx: newline also */
|
---|
| 1512 | /* -w N: assume width N (-xxx -w 32: hex viewer of sorts) */
|
---|
| 1513 | getopt32(argv, "EMmN~I" IF_FEATURE_LESS_DASHCMD("S"));
|
---|
| 1514 | argc -= optind;
|
---|
| 1515 | argv += optind;
|
---|
| 1516 | num_files = argc;
|
---|
| 1517 | files = argv;
|
---|
| 1518 |
|
---|
| 1519 | /* Another popular pager, most, detects when stdout
|
---|
| 1520 | * is not a tty and turns into cat. This makes sense. */
|
---|
| 1521 | if (!isatty(STDOUT_FILENO))
|
---|
| 1522 | return bb_cat(argv);
|
---|
| 1523 |
|
---|
| 1524 | if (!num_files) {
|
---|
| 1525 | if (isatty(STDIN_FILENO)) {
|
---|
| 1526 | /* Just "less"? No args and no redirection? */
|
---|
| 1527 | bb_error_msg("missing filename");
|
---|
| 1528 | bb_show_usage();
|
---|
| 1529 | }
|
---|
| 1530 | } else {
|
---|
| 1531 | filename = xstrdup(files[0]);
|
---|
| 1532 | }
|
---|
| 1533 |
|
---|
| 1534 | if (option_mask32 & FLAG_TILDE)
|
---|
| 1535 | empty_line_marker = "";
|
---|
| 1536 |
|
---|
| 1537 | kbd_fd = open(CURRENT_TTY, O_RDONLY);
|
---|
| 1538 | if (kbd_fd < 0)
|
---|
| 1539 | return bb_cat(argv);
|
---|
| 1540 | ndelay_on(kbd_fd);
|
---|
| 1541 |
|
---|
| 1542 | tcgetattr(kbd_fd, &term_orig);
|
---|
| 1543 | term_less = term_orig;
|
---|
| 1544 | term_less.c_lflag &= ~(ICANON | ECHO);
|
---|
| 1545 | term_less.c_iflag &= ~(IXON | ICRNL);
|
---|
| 1546 | /*term_less.c_oflag &= ~ONLCR;*/
|
---|
| 1547 | term_less.c_cc[VMIN] = 1;
|
---|
| 1548 | term_less.c_cc[VTIME] = 0;
|
---|
| 1549 |
|
---|
| 1550 | get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
| 1551 | /* 20: two tabstops + 4 */
|
---|
| 1552 | if (width < 20 || max_displayed_line < 3)
|
---|
| 1553 | return bb_cat(argv);
|
---|
| 1554 | max_displayed_line -= 2;
|
---|
| 1555 |
|
---|
| 1556 | /* We want to restore term_orig on exit */
|
---|
| 1557 | bb_signals(BB_FATAL_SIGS, sig_catcher);
|
---|
| 1558 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1559 | signal(SIGWINCH, sigwinch_handler);
|
---|
| 1560 | #endif
|
---|
| 1561 |
|
---|
| 1562 | buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
---|
| 1563 | reinitialize();
|
---|
| 1564 | while (1) {
|
---|
| 1565 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1566 | while (WINCH_COUNTER) {
|
---|
| 1567 | again:
|
---|
| 1568 | winch_counter--;
|
---|
| 1569 | get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
| 1570 | /* 20: two tabstops + 4 */
|
---|
| 1571 | if (width < 20)
|
---|
| 1572 | width = 20;
|
---|
| 1573 | if (max_displayed_line < 3)
|
---|
| 1574 | max_displayed_line = 3;
|
---|
| 1575 | max_displayed_line -= 2;
|
---|
| 1576 | free(buffer);
|
---|
| 1577 | buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
---|
| 1578 | /* Avoid re-wrap and/or redraw if we already know
|
---|
| 1579 | * we need to do it again. These ops are expensive */
|
---|
| 1580 | if (WINCH_COUNTER)
|
---|
| 1581 | goto again;
|
---|
| 1582 | re_wrap();
|
---|
| 1583 | if (WINCH_COUNTER)
|
---|
| 1584 | goto again;
|
---|
| 1585 | buffer_fill_and_print();
|
---|
| 1586 | /* This took some time. Loop back and check,
|
---|
| 1587 | * were there another SIGWINCH? */
|
---|
| 1588 | }
|
---|
| 1589 | #endif
|
---|
| 1590 | keypress = less_getch(-1); /* -1: do not position cursor */
|
---|
| 1591 | keypress_process(keypress);
|
---|
| 1592 | }
|
---|
| 1593 | }
|
---|
| 1594 |
|
---|
| 1595 | /*
|
---|
| 1596 | Help text of less version 418 is below.
|
---|
| 1597 | If you are implementing something, keeping
|
---|
| 1598 | key and/or command line switch compatibility is a good idea:
|
---|
| 1599 |
|
---|
| 1600 |
|
---|
| 1601 | SUMMARY OF LESS COMMANDS
|
---|
| 1602 |
|
---|
| 1603 | Commands marked with * may be preceded by a number, N.
|
---|
| 1604 | Notes in parentheses indicate the behavior if N is given.
|
---|
| 1605 | h H Display this help.
|
---|
| 1606 | q :q Q :Q ZZ Exit.
|
---|
| 1607 | ---------------------------------------------------------------------------
|
---|
| 1608 | MOVING
|
---|
| 1609 | e ^E j ^N CR * Forward one line (or N lines).
|
---|
| 1610 | y ^Y k ^K ^P * Backward one line (or N lines).
|
---|
| 1611 | f ^F ^V SPACE * Forward one window (or N lines).
|
---|
| 1612 | b ^B ESC-v * Backward one window (or N lines).
|
---|
| 1613 | z * Forward one window (and set window to N).
|
---|
| 1614 | w * Backward one window (and set window to N).
|
---|
| 1615 | ESC-SPACE * Forward one window, but don't stop at end-of-file.
|
---|
| 1616 | d ^D * Forward one half-window (and set half-window to N).
|
---|
| 1617 | u ^U * Backward one half-window (and set half-window to N).
|
---|
| 1618 | ESC-) RightArrow * Left one half screen width (or N positions).
|
---|
| 1619 | ESC-( LeftArrow * Right one half screen width (or N positions).
|
---|
| 1620 | F Forward forever; like "tail -f".
|
---|
| 1621 | r ^R ^L Repaint screen.
|
---|
| 1622 | R Repaint screen, discarding buffered input.
|
---|
| 1623 | ---------------------------------------------------
|
---|
| 1624 | Default "window" is the screen height.
|
---|
| 1625 | Default "half-window" is half of the screen height.
|
---|
| 1626 | ---------------------------------------------------------------------------
|
---|
| 1627 | SEARCHING
|
---|
| 1628 | /pattern * Search forward for (N-th) matching line.
|
---|
| 1629 | ?pattern * Search backward for (N-th) matching line.
|
---|
| 1630 | n * Repeat previous search (for N-th occurrence).
|
---|
| 1631 | N * Repeat previous search in reverse direction.
|
---|
| 1632 | ESC-n * Repeat previous search, spanning files.
|
---|
| 1633 | ESC-N * Repeat previous search, reverse dir. & spanning files.
|
---|
| 1634 | ESC-u Undo (toggle) search highlighting.
|
---|
| 1635 | ---------------------------------------------------
|
---|
| 1636 | Search patterns may be modified by one or more of:
|
---|
| 1637 | ^N or ! Search for NON-matching lines.
|
---|
| 1638 | ^E or * Search multiple files (pass thru END OF FILE).
|
---|
| 1639 | ^F or @ Start search at FIRST file (for /) or last file (for ?).
|
---|
| 1640 | ^K Highlight matches, but don't move (KEEP position).
|
---|
| 1641 | ^R Don't use REGULAR EXPRESSIONS.
|
---|
| 1642 | ---------------------------------------------------------------------------
|
---|
| 1643 | JUMPING
|
---|
| 1644 | g < ESC-< * Go to first line in file (or line N).
|
---|
| 1645 | G > ESC-> * Go to last line in file (or line N).
|
---|
| 1646 | p % * Go to beginning of file (or N percent into file).
|
---|
| 1647 | t * Go to the (N-th) next tag.
|
---|
| 1648 | T * Go to the (N-th) previous tag.
|
---|
| 1649 | { ( [ * Find close bracket } ) ].
|
---|
| 1650 | } ) ] * Find open bracket { ( [.
|
---|
| 1651 | ESC-^F <c1> <c2> * Find close bracket <c2>.
|
---|
| 1652 | ESC-^B <c1> <c2> * Find open bracket <c1>
|
---|
| 1653 | ---------------------------------------------------
|
---|
| 1654 | Each "find close bracket" command goes forward to the close bracket
|
---|
| 1655 | matching the (N-th) open bracket in the top line.
|
---|
| 1656 | Each "find open bracket" command goes backward to the open bracket
|
---|
| 1657 | matching the (N-th) close bracket in the bottom line.
|
---|
| 1658 | m<letter> Mark the current position with <letter>.
|
---|
| 1659 | '<letter> Go to a previously marked position.
|
---|
| 1660 | '' Go to the previous position.
|
---|
| 1661 | ^X^X Same as '.
|
---|
| 1662 | ---------------------------------------------------
|
---|
| 1663 | A mark is any upper-case or lower-case letter.
|
---|
| 1664 | Certain marks are predefined:
|
---|
| 1665 | ^ means beginning of the file
|
---|
| 1666 | $ means end of the file
|
---|
| 1667 | ---------------------------------------------------------------------------
|
---|
| 1668 | CHANGING FILES
|
---|
| 1669 | :e [file] Examine a new file.
|
---|
| 1670 | ^X^V Same as :e.
|
---|
| 1671 | :n * Examine the (N-th) next file from the command line.
|
---|
| 1672 | :p * Examine the (N-th) previous file from the command line.
|
---|
| 1673 | :x * Examine the first (or N-th) file from the command line.
|
---|
| 1674 | :d Delete the current file from the command line list.
|
---|
| 1675 | = ^G :f Print current file name.
|
---|
| 1676 | ---------------------------------------------------------------------------
|
---|
| 1677 | MISCELLANEOUS COMMANDS
|
---|
| 1678 | -<flag> Toggle a command line option [see OPTIONS below].
|
---|
| 1679 | --<name> Toggle a command line option, by name.
|
---|
| 1680 | _<flag> Display the setting of a command line option.
|
---|
| 1681 | __<name> Display the setting of an option, by name.
|
---|
| 1682 | +cmd Execute the less cmd each time a new file is examined.
|
---|
| 1683 | !command Execute the shell command with $SHELL.
|
---|
| 1684 | |Xcommand Pipe file between current pos & mark X to shell command.
|
---|
| 1685 | v Edit the current file with $VISUAL or $EDITOR.
|
---|
| 1686 | V Print version number of "less".
|
---|
| 1687 | ---------------------------------------------------------------------------
|
---|
| 1688 | OPTIONS
|
---|
| 1689 | Most options may be changed either on the command line,
|
---|
| 1690 | or from within less by using the - or -- command.
|
---|
| 1691 | Options may be given in one of two forms: either a single
|
---|
| 1692 | character preceded by a -, or a name preceeded by --.
|
---|
| 1693 | -? ........ --help
|
---|
| 1694 | Display help (from command line).
|
---|
| 1695 | -a ........ --search-skip-screen
|
---|
| 1696 | Forward search skips current screen.
|
---|
| 1697 | -b [N] .... --buffers=[N]
|
---|
| 1698 | Number of buffers.
|
---|
| 1699 | -B ........ --auto-buffers
|
---|
| 1700 | Don't automatically allocate buffers for pipes.
|
---|
| 1701 | -c ........ --clear-screen
|
---|
| 1702 | Repaint by clearing rather than scrolling.
|
---|
| 1703 | -d ........ --dumb
|
---|
| 1704 | Dumb terminal.
|
---|
| 1705 | -D [xn.n] . --color=xn.n
|
---|
| 1706 | Set screen colors. (MS-DOS only)
|
---|
| 1707 | -e -E .... --quit-at-eof --QUIT-AT-EOF
|
---|
| 1708 | Quit at end of file.
|
---|
| 1709 | -f ........ --force
|
---|
| 1710 | Force open non-regular files.
|
---|
| 1711 | -F ........ --quit-if-one-screen
|
---|
| 1712 | Quit if entire file fits on first screen.
|
---|
| 1713 | -g ........ --hilite-search
|
---|
| 1714 | Highlight only last match for searches.
|
---|
| 1715 | -G ........ --HILITE-SEARCH
|
---|
| 1716 | Don't highlight any matches for searches.
|
---|
| 1717 | -h [N] .... --max-back-scroll=[N]
|
---|
| 1718 | Backward scroll limit.
|
---|
| 1719 | -i ........ --ignore-case
|
---|
| 1720 | Ignore case in searches that do not contain uppercase.
|
---|
| 1721 | -I ........ --IGNORE-CASE
|
---|
| 1722 | Ignore case in all searches.
|
---|
| 1723 | -j [N] .... --jump-target=[N]
|
---|
| 1724 | Screen position of target lines.
|
---|
| 1725 | -J ........ --status-column
|
---|
| 1726 | Display a status column at left edge of screen.
|
---|
| 1727 | -k [file] . --lesskey-file=[file]
|
---|
| 1728 | Use a lesskey file.
|
---|
| 1729 | -L ........ --no-lessopen
|
---|
| 1730 | Ignore the LESSOPEN environment variable.
|
---|
| 1731 | -m -M .... --long-prompt --LONG-PROMPT
|
---|
| 1732 | Set prompt style.
|
---|
| 1733 | -n -N .... --line-numbers --LINE-NUMBERS
|
---|
| 1734 | Don't use line numbers.
|
---|
| 1735 | -o [file] . --log-file=[file]
|
---|
| 1736 | Copy to log file (standard input only).
|
---|
| 1737 | -O [file] . --LOG-FILE=[file]
|
---|
| 1738 | Copy to log file (unconditionally overwrite).
|
---|
| 1739 | -p [pattern] --pattern=[pattern]
|
---|
| 1740 | Start at pattern (from command line).
|
---|
| 1741 | -P [prompt] --prompt=[prompt]
|
---|
| 1742 | Define new prompt.
|
---|
| 1743 | -q -Q .... --quiet --QUIET --silent --SILENT
|
---|
| 1744 | Quiet the terminal bell.
|
---|
| 1745 | -r -R .... --raw-control-chars --RAW-CONTROL-CHARS
|
---|
| 1746 | Output "raw" control characters.
|
---|
| 1747 | -s ........ --squeeze-blank-lines
|
---|
| 1748 | Squeeze multiple blank lines.
|
---|
| 1749 | -S ........ --chop-long-lines
|
---|
| 1750 | Chop long lines.
|
---|
| 1751 | -t [tag] .. --tag=[tag]
|
---|
| 1752 | Find a tag.
|
---|
| 1753 | -T [tagsfile] --tag-file=[tagsfile]
|
---|
| 1754 | Use an alternate tags file.
|
---|
| 1755 | -u -U .... --underline-special --UNDERLINE-SPECIAL
|
---|
| 1756 | Change handling of backspaces.
|
---|
| 1757 | -V ........ --version
|
---|
| 1758 | Display the version number of "less".
|
---|
| 1759 | -w ........ --hilite-unread
|
---|
| 1760 | Highlight first new line after forward-screen.
|
---|
| 1761 | -W ........ --HILITE-UNREAD
|
---|
| 1762 | Highlight first new line after any forward movement.
|
---|
| 1763 | -x [N[,...]] --tabs=[N[,...]]
|
---|
| 1764 | Set tab stops.
|
---|
| 1765 | -X ........ --no-init
|
---|
| 1766 | Don't use termcap init/deinit strings.
|
---|
| 1767 | --no-keypad
|
---|
| 1768 | Don't use termcap keypad init/deinit strings.
|
---|
| 1769 | -y [N] .... --max-forw-scroll=[N]
|
---|
| 1770 | Forward scroll limit.
|
---|
| 1771 | -z [N] .... --window=[N]
|
---|
| 1772 | Set size of window.
|
---|
| 1773 | -" [c[c]] . --quotes=[c[c]]
|
---|
| 1774 | Set shell quote characters.
|
---|
| 1775 | -~ ........ --tilde
|
---|
| 1776 | Don't display tildes after end of file.
|
---|
| 1777 | -# [N] .... --shift=[N]
|
---|
| 1778 | Horizontal scroll amount (0 = one half screen width)
|
---|
| 1779 |
|
---|
| 1780 | ---------------------------------------------------------------------------
|
---|
| 1781 | LINE EDITING
|
---|
| 1782 | These keys can be used to edit text being entered
|
---|
| 1783 | on the "command line" at the bottom of the screen.
|
---|
| 1784 | RightArrow ESC-l Move cursor right one character.
|
---|
| 1785 | LeftArrow ESC-h Move cursor left one character.
|
---|
| 1786 | CNTL-RightArrow ESC-RightArrow ESC-w Move cursor right one word.
|
---|
| 1787 | CNTL-LeftArrow ESC-LeftArrow ESC-b Move cursor left one word.
|
---|
| 1788 | HOME ESC-0 Move cursor to start of line.
|
---|
| 1789 | END ESC-$ Move cursor to end of line.
|
---|
| 1790 | BACKSPACE Delete char to left of cursor.
|
---|
| 1791 | DELETE ESC-x Delete char under cursor.
|
---|
| 1792 | CNTL-BACKSPACE ESC-BACKSPACE Delete word to left of cursor.
|
---|
| 1793 | CNTL-DELETE ESC-DELETE ESC-X Delete word under cursor.
|
---|
| 1794 | CNTL-U ESC (MS-DOS only) Delete entire line.
|
---|
| 1795 | UpArrow ESC-k Retrieve previous command line.
|
---|
| 1796 | DownArrow ESC-j Retrieve next command line.
|
---|
| 1797 | TAB Complete filename & cycle.
|
---|
| 1798 | SHIFT-TAB ESC-TAB Complete filename & reverse cycle.
|
---|
| 1799 | CNTL-L Complete filename, list all.
|
---|
| 1800 | */
|
---|