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 | //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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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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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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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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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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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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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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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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125 | //usage: "\n -~ Suppress ~s displayed past EOF"
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126 |
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127 | #include <sched.h> /* sched_yield() */
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128 |
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129 | #include "libbb.h"
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130 | #include "common_bufsiz.h"
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131 | #if ENABLE_FEATURE_LESS_REGEXP
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132 | #include "xregex.h"
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133 | #endif
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134 |
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135 |
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136 | #define ESC "\033"
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137 | /* The escape codes for highlighted and normal text */
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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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144 |
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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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152 | /* Command line options */
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153 | enum {
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154 | FLAG_E = 1 << 0,
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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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159 | FLAG_I = 1 << 5,
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160 | FLAG_S = (1 << 6) * ENABLE_FEATURE_LESS_TRUNCATE,
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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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164 |
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165 | #if !ENABLE_FEATURE_LESS_REGEXP
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166 | enum { pattern_valid = 0 };
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167 | #endif
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168 |
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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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172 | int less_gets_pos;
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173 | /* last position in last line, taking into account tabs */
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174 | size_t last_line_pos;
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175 | unsigned max_fline;
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176 | unsigned max_lineno; /* this one tracks linewrap */
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177 | unsigned max_displayed_line;
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178 | unsigned width;
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179 | #if ENABLE_FEATURE_LESS_WINCH
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180 | unsigned winch_counter;
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181 | #endif
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182 | ssize_t eof_error; /* eof if 0, error if < 0 */
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183 | ssize_t readpos;
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184 | ssize_t readeof; /* must be signed */
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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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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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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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201 | #endif
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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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205 | int wanted_match; /* signed! */
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206 | int num_matches;
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207 | regex_t pattern;
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208 | smallint pattern_valid;
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209 | #endif
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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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213 | smallint terminated;
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214 | struct termios term_orig, term_less;
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215 | char kbd_input[KEYCODE_BUFFER_SIZE];
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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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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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222 | #define max_fline (G.max_fline )
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223 | #define max_lineno (G.max_lineno )
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224 | #define max_displayed_line (G.max_displayed_line)
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225 | #define width (G.width )
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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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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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239 | #define num_lines (G.num_lines )
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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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246 | #define wanted_match (G.wanted_match )
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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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253 | #define kbd_input (G.kbd_input )
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254 | #define INIT_G() do { \
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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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264 |
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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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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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276 | fflush_all();
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277 | tcsetattr(kbd_fd, TCSANOW, &term_orig);
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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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282 | static void move_cursor(int line, int row)
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283 | {
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284 | printf(ESC"[%u;%uH", line, row);
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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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289 | printf(ESC"[%u;0H" CLEAR_2_EOL, max_displayed_line + 2);
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290 | }
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291 |
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292 | static void print_hilite(const char *str)
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293 | {
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294 | printf(HIGHLIGHT"%s"NORMAL, str);
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295 | }
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296 |
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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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301 | }
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302 |
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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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342 | if (*d == '\t') { /* tab */
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343 | new_line_pos += 7;
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344 | new_line_pos &= (~7);
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345 | }
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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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395 | #if ENABLE_FEATURE_LESS_REGEXP
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396 | pattern_valid = 0;
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397 | #endif
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398 | }
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399 | #endif
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400 |
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401 | #if ENABLE_FEATURE_LESS_REGEXP
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402 | static void fill_match_lines(unsigned pos);
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403 | #else
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404 | #define fill_match_lines(pos) ((void)0)
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405 | #endif
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406 |
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407 | static int at_end(void)
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408 | {
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409 | return (option_mask32 & FLAG_S)
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410 | ? !(cur_fline <= max_fline &&
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411 | max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
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412 | : !(max_fline > cur_fline + max_displayed_line);
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413 | }
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414 |
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415 | /* Devilishly complex routine.
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416 | *
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417 | * Has to deal with EOF and EPIPE on input,
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418 | * with line wrapping, with last line not ending in '\n'
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419 | * (possibly not ending YET!), with backspace and tabs.
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420 | * It reads input again if last time we got an EOF (thus supporting
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421 | * growing files) or EPIPE (watching output of slow process like make).
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422 | *
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423 | * Variables used:
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424 | * flines[] - array of lines already read. Linewrap may cause
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425 | * one source file line to occupy several flines[n].
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426 | * flines[max_fline] - last line, possibly incomplete.
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427 | * terminated - 1 if flines[max_fline] is 'terminated'
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428 | * (if there was '\n' [which isn't stored itself, we just remember
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429 | * that it was seen])
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430 | * max_lineno - last line's number, this one doesn't increment
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431 | * on line wrap, only on "real" new lines.
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432 | * readbuf[0..readeof-1] - small preliminary buffer.
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433 | * readbuf[readpos] - next character to add to current line.
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434 | * last_line_pos - screen line position of next char to be read
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435 | * (takes into account tabs and backspaces)
|
---|
436 | * eof_error - < 0 error, == 0 EOF, > 0 not EOF/error
|
---|
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.
|
---|
440 | */
|
---|
441 | static void read_lines(void)
|
---|
442 | {
|
---|
443 | char *current_line, *p;
|
---|
444 | int w = width;
|
---|
445 | char last_terminated = terminated;
|
---|
446 | time_t last_time = 0;
|
---|
447 | int retry_EAGAIN = 2;
|
---|
448 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
449 | unsigned old_max_fline = max_fline;
|
---|
450 | #endif
|
---|
451 |
|
---|
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 |
|
---|
459 | if (option_mask32 & FLAG_N)
|
---|
460 | w -= 8;
|
---|
461 |
|
---|
462 | p = current_line = ((char*)xmalloc(w + 5)) + 4;
|
---|
463 | if (!last_terminated) {
|
---|
464 | const char *cp = flines[max_fline];
|
---|
465 | p = stpcpy(p, cp);
|
---|
466 | free(MEMPTR(cp));
|
---|
467 | /* last_line_pos is still valid from previous read_lines() */
|
---|
468 | } else {
|
---|
469 | max_fline++;
|
---|
470 | last_line_pos = 0;
|
---|
471 | }
|
---|
472 |
|
---|
473 | while (1) { /* read lines until we reach cur_fline or wanted_match */
|
---|
474 | *p = '\0';
|
---|
475 | terminated = 0;
|
---|
476 | while (1) { /* read chars until we have a line */
|
---|
477 | char c;
|
---|
478 | /* if no unprocessed chars left, eat more */
|
---|
479 | if (readpos >= readeof) {
|
---|
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) */
|
---|
498 | readpos = 0;
|
---|
499 | readeof = eof_error;
|
---|
500 | if (eof_error <= 0)
|
---|
501 | goto reached_eof;
|
---|
502 | retry_EAGAIN = 1;
|
---|
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 */
|
---|
508 | if (c == '\x8' && last_line_pos && p[-1] != '\t') {
|
---|
509 | readpos++; /* eat it */
|
---|
510 | last_line_pos--;
|
---|
511 | /* was buggy (p could end up <= current_line)... */
|
---|
512 | *--p = '\0';
|
---|
513 | continue;
|
---|
514 | }
|
---|
515 | {
|
---|
516 | size_t new_last_line_pos = last_line_pos + 1;
|
---|
517 | if (c == '\t') {
|
---|
518 | new_last_line_pos += 7;
|
---|
519 | new_last_line_pos &= (~7);
|
---|
520 | }
|
---|
521 | if ((int)new_last_line_pos > w)
|
---|
522 | break;
|
---|
523 | last_line_pos = new_last_line_pos;
|
---|
524 | }
|
---|
525 | /* ok, we will eat this char */
|
---|
526 | readpos++;
|
---|
527 | if (c == '\n') {
|
---|
528 | terminated = 1;
|
---|
529 | last_line_pos = 0;
|
---|
530 | break;
|
---|
531 | }
|
---|
532 | /* NUL is substituted by '\n'! */
|
---|
533 | if (c == '\0') c = '\n';
|
---|
534 | *p++ = c;
|
---|
535 | *p = '\0';
|
---|
536 | } /* end of "read chars until we have a line" loop */
|
---|
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)
|
---|
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++;
|
---|
547 | continue;
|
---|
548 | }
|
---|
549 | #endif
|
---|
550 | reached_eof:
|
---|
551 | last_terminated = terminated;
|
---|
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 |
|
---|
559 | if (max_fline >= MAXLINES) {
|
---|
560 | eof_error = 0; /* Pretend we saw EOF */
|
---|
561 | break;
|
---|
562 | }
|
---|
563 | if (!at_end()) {
|
---|
564 | #if !ENABLE_FEATURE_LESS_REGEXP
|
---|
565 | break;
|
---|
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 | }
|
---|
575 | if (eof_error <= 0) {
|
---|
576 | break;
|
---|
577 | }
|
---|
578 | max_fline++;
|
---|
579 | current_line = ((char*)xmalloc(w + 5)) + 4;
|
---|
580 | p = current_line;
|
---|
581 | last_line_pos = 0;
|
---|
582 | } /* end of "read lines until we reach cur_fline" loop */
|
---|
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 |
|
---|
596 | fill_match_lines(old_max_fline);
|
---|
597 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
598 | /* prevent us from being stuck in search for a match */
|
---|
599 | wanted_match = -1;
|
---|
600 | #endif
|
---|
601 | #undef readbuf
|
---|
602 | }
|
---|
603 |
|
---|
604 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
605 | static int safe_lineno(int fline)
|
---|
606 | {
|
---|
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;
|
---|
615 | }
|
---|
616 |
|
---|
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 |
|
---|
655 | /* Print a status line if -M was specified */
|
---|
656 | static void m_status_print(void)
|
---|
657 | {
|
---|
658 | int first, last;
|
---|
659 | unsigned percent;
|
---|
660 |
|
---|
661 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
662 | return;
|
---|
663 |
|
---|
664 | clear_line();
|
---|
665 | printf(HIGHLIGHT"%s", filename);
|
---|
666 | if (num_files > 1)
|
---|
667 | printf(" (file %i of %i)", current_file, num_files);
|
---|
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)");
|
---|
681 | if (num_files > 1 && current_file != num_files)
|
---|
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);
|
---|
686 | }
|
---|
687 | printf(NORMAL);
|
---|
688 | }
|
---|
689 | #endif
|
---|
690 |
|
---|
691 | /* Print the status line */
|
---|
692 | static void status_print(void)
|
---|
693 | {
|
---|
694 | const char *p;
|
---|
695 |
|
---|
696 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
697 | return;
|
---|
698 |
|
---|
699 | /* Change the status if flags have been set */
|
---|
700 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
701 | if (option_mask32 & (FLAG_M|FLAG_m)) {
|
---|
702 | m_status_print();
|
---|
703 | return;
|
---|
704 | }
|
---|
705 | /* No flags set */
|
---|
706 | #endif
|
---|
707 |
|
---|
708 | clear_line();
|
---|
709 | if (cur_fline && !at_end()) {
|
---|
710 | bb_putchar(':');
|
---|
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 =
|
---|
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 */
|
---|
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 |
|
---|
735 | static void print_lineno(const char *line)
|
---|
736 | {
|
---|
737 | const char *fmt = " ";
|
---|
738 | unsigned n = n; /* for compiler */
|
---|
739 |
|
---|
740 | if (line != empty_line_marker) {
|
---|
741 | /* Width of 7 preserves tab spacing in the text */
|
---|
742 | fmt = "%7u ";
|
---|
743 | n = LINENO(line) + 1;
|
---|
744 | if (n > 9999999 && MAXLINES > 9999999) {
|
---|
745 | n %= 10000000;
|
---|
746 | fmt = "%07u ";
|
---|
747 | }
|
---|
748 | }
|
---|
749 | printf(fmt, n);
|
---|
750 | }
|
---|
751 |
|
---|
752 |
|
---|
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 |
|
---|
761 | char buf[width+1];
|
---|
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;
|
---|
773 | }
|
---|
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
|
---|
784 | * and NORMAL escape sequences placed around it.
|
---|
785 | * NB: we regex against line, but insert text
|
---|
786 | * from quarantined copy (buf[]) */
|
---|
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,
|
---|
794 | growline ? growline : "",
|
---|
795 | (int)match_structs.rm_so, str,
|
---|
796 | (int)(match_structs.rm_eo - match_structs.rm_so),
|
---|
797 | str + match_structs.rm_so);
|
---|
798 | free(growline);
|
---|
799 | growline = new;
|
---|
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);
|
---|
806 | /* if even "" matches, treat it as "not a match" */
|
---|
807 | if (match_structs.rm_so >= match_structs.rm_eo)
|
---|
808 | match_status = 1;
|
---|
809 | }
|
---|
810 |
|
---|
811 | printf("%s%s\n", growline ? growline : "", str);
|
---|
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 | {
|
---|
820 | char buf[width+1];
|
---|
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;
|
---|
830 | }
|
---|
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);
|
---|
846 | }
|
---|
847 | puts(str);
|
---|
848 | }
|
---|
849 |
|
---|
850 | /* Print the buffer */
|
---|
851 | static void buffer_print(void)
|
---|
852 | {
|
---|
853 | unsigned i;
|
---|
854 |
|
---|
855 | move_cursor(0, 0);
|
---|
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]);
|
---|
860 | if (pattern_valid)
|
---|
861 | print_found(buffer[i]);
|
---|
862 | else
|
---|
863 | print_ascii(buffer[i]);
|
---|
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 | }
|
---|
871 | status_print();
|
---|
872 | }
|
---|
873 |
|
---|
874 | static void buffer_fill_and_print(void)
|
---|
875 | {
|
---|
876 | unsigned i;
|
---|
877 | #if ENABLE_FEATURE_LESS_TRUNCATE
|
---|
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
|
---|
899 | for (i = 0; i <= max_displayed_line && cur_fline + i <= max_fline; i++) {
|
---|
900 | buffer[i] = flines[cur_fline + i];
|
---|
901 | }
|
---|
902 | #endif
|
---|
903 | for (; i <= max_displayed_line; i++) {
|
---|
904 | buffer[i] = empty_line_marker;
|
---|
905 | }
|
---|
906 | buffer_print();
|
---|
907 | }
|
---|
908 |
|
---|
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 |
|
---|
950 | /* Move the buffer up and down in the file in order to scroll */
|
---|
951 | static void buffer_down(int nlines)
|
---|
952 | {
|
---|
953 | if ((option_mask32 & FLAG_S))
|
---|
954 | goto_lineno(LINENO(flines[cur_fline]) + nlines);
|
---|
955 | else
|
---|
956 | cur_fline += nlines;
|
---|
957 | read_lines();
|
---|
958 | cap_cur_fline();
|
---|
959 | buffer_fill_and_print();
|
---|
960 | }
|
---|
961 |
|
---|
962 | static void buffer_up(int nlines)
|
---|
963 | {
|
---|
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 | }
|
---|
972 | read_lines();
|
---|
973 | buffer_fill_and_print();
|
---|
974 | }
|
---|
975 |
|
---|
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)
|
---|
979 | {
|
---|
980 | if (linenum <= 0)
|
---|
981 | cur_fline = 0;
|
---|
982 | else if (is_lineno)
|
---|
983 | goto_lineno(linenum);
|
---|
984 | else
|
---|
985 | cur_fline = linenum;
|
---|
986 | read_lines();
|
---|
987 | cap_cur_fline();
|
---|
988 | buffer_fill_and_print();
|
---|
989 | }
|
---|
990 |
|
---|
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 |
|
---|
1001 | static void open_file_and_read_lines(void)
|
---|
1002 | {
|
---|
1003 | if (filename) {
|
---|
1004 | xmove_fd(xopen(filename, O_RDONLY), STDIN_FILENO);
|
---|
1005 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
1006 | num_lines = REOPEN_AND_COUNT;
|
---|
1007 | #endif
|
---|
1008 | } else {
|
---|
1009 | /* "less" with no arguments in argv[] */
|
---|
1010 | /* For status line only */
|
---|
1011 | filename = xstrdup(bb_msg_standard_input);
|
---|
1012 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
1013 | num_lines = REOPEN_STDIN;
|
---|
1014 | #endif
|
---|
1015 | }
|
---|
1016 | readpos = 0;
|
---|
1017 | readeof = 0;
|
---|
1018 | last_line_pos = 0;
|
---|
1019 | terminated = 1;
|
---|
1020 | read_lines();
|
---|
1021 | }
|
---|
1022 |
|
---|
1023 | /* Reinitialize everything for a new file - free the memory and start over */
|
---|
1024 | static void reinitialize(void)
|
---|
1025 | {
|
---|
1026 | unsigned i;
|
---|
1027 |
|
---|
1028 | if (flines) {
|
---|
1029 | for (i = 0; i <= max_fline; i++)
|
---|
1030 | free(MEMPTR(flines[i]));
|
---|
1031 | free(flines);
|
---|
1032 | flines = NULL;
|
---|
1033 | }
|
---|
1034 |
|
---|
1035 | max_fline = -1;
|
---|
1036 | cur_fline = 0;
|
---|
1037 | max_lineno = 0;
|
---|
1038 | open_file_and_read_lines();
|
---|
1039 | #if ENABLE_FEATURE_LESS_ASK_TERMINAL
|
---|
1040 | if (G.winsize_err)
|
---|
1041 | printf("\033[999;999H" "\033[6n");
|
---|
1042 | #endif
|
---|
1043 | buffer_fill_and_print();
|
---|
1044 | }
|
---|
1045 |
|
---|
1046 | static int64_t getch_nowait(void)
|
---|
1047 | {
|
---|
1048 | int rd;
|
---|
1049 | int64_t key64;
|
---|
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;
|
---|
1056 | again:
|
---|
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
|
---|
1062 | * (switch fd into O_NONBLOCK'ed mode to avoid it)
|
---|
1063 | */
|
---|
1064 | rd = 1;
|
---|
1065 | /* Are we interested in stdin? */
|
---|
1066 | if (at_end()) {
|
---|
1067 | if (eof_error > 0) /* did NOT reach eof yet */
|
---|
1068 | rd = 0; /* yes, we are interested in stdin */
|
---|
1069 | }
|
---|
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();
|
---|
1074 |
|
---|
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
|
---|
1088 | }
|
---|
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 */
|
---|
1092 | key64 = read_key(kbd_fd, kbd_input, /*timeout off:*/ -2);
|
---|
1093 | if ((int)key64 == -1) {
|
---|
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();
|
---|
1105 | return key64;
|
---|
1106 | }
|
---|
1107 |
|
---|
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. */
|
---|
1111 | static int64_t less_getch(int pos)
|
---|
1112 | {
|
---|
1113 | int64_t key64;
|
---|
1114 | int key;
|
---|
1115 |
|
---|
1116 | again:
|
---|
1117 | less_gets_pos = pos;
|
---|
1118 | key = key64 = getch_nowait();
|
---|
1119 | less_gets_pos = -1;
|
---|
1120 |
|
---|
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)
|
---|
1126 | goto again;
|
---|
1127 |
|
---|
1128 | return key64;
|
---|
1129 | }
|
---|
1130 |
|
---|
1131 | static char* less_gets(int sz)
|
---|
1132 | {
|
---|
1133 | int c;
|
---|
1134 | unsigned i = 0;
|
---|
1135 | char *result = xzalloc(1);
|
---|
1136 |
|
---|
1137 | while (1) {
|
---|
1138 | c = '\0';
|
---|
1139 | less_gets_pos = sz + i;
|
---|
1140 | c = getch_nowait();
|
---|
1141 | if (c == 0x0d) {
|
---|
1142 | result[i] = '\0';
|
---|
1143 | less_gets_pos = -1;
|
---|
1144 | return result;
|
---|
1145 | }
|
---|
1146 | if (c == 0x7f)
|
---|
1147 | c = 8;
|
---|
1148 | if (c == 8 && i) {
|
---|
1149 | printf("\x8 \x8");
|
---|
1150 | i--;
|
---|
1151 | }
|
---|
1152 | if (c < ' ') /* filters out KEYCODE_xxx too (<0) */
|
---|
1153 | continue;
|
---|
1154 | if (i >= width - sz - 1)
|
---|
1155 | continue; /* len limit */
|
---|
1156 | bb_putchar(c);
|
---|
1157 | result[i++] = c;
|
---|
1158 | result = xrealloc(result, i+1);
|
---|
1159 | }
|
---|
1160 | }
|
---|
1161 |
|
---|
1162 | static void examine_file(void)
|
---|
1163 | {
|
---|
1164 | char *new_fname;
|
---|
1165 |
|
---|
1166 | print_statusline("Examine: ");
|
---|
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 | }
|
---|
1178 | free(filename);
|
---|
1179 | filename = new_fname;
|
---|
1180 | /* files start by = argv. why we assume that argv is infinitely long??
|
---|
1181 | files[num_files] = filename;
|
---|
1182 | current_file = num_files + 1;
|
---|
1183 | num_files++; */
|
---|
1184 | files[0] = filename;
|
---|
1185 | num_files = current_file = 1;
|
---|
1186 | reinitialize();
|
---|
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
|
---|
1192 | * 1: go forward one file */
|
---|
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;
|
---|
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");
|
---|
1202 | }
|
---|
1203 | }
|
---|
1204 |
|
---|
1205 | static void remove_current_file(void)
|
---|
1206 | {
|
---|
1207 | unsigned i;
|
---|
1208 |
|
---|
1209 | if (num_files < 2)
|
---|
1210 | return;
|
---|
1211 |
|
---|
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--;
|
---|
1217 | } else {
|
---|
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 */
|
---|
1231 | print_statusline(" :");
|
---|
1232 |
|
---|
1233 | keypress = less_getch(2);
|
---|
1234 | switch (keypress) {
|
---|
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;
|
---|
1245 | #endif
|
---|
1246 | case 'n':
|
---|
1247 | change_file(1);
|
---|
1248 | break;
|
---|
1249 | case 'p':
|
---|
1250 | change_file(-1);
|
---|
1251 | break;
|
---|
1252 | case 'q':
|
---|
1253 | less_exit(EXIT_SUCCESS);
|
---|
1254 | break;
|
---|
1255 | case 'x':
|
---|
1256 | change_file(0);
|
---|
1257 | break;
|
---|
1258 | }
|
---|
1259 | }
|
---|
1260 |
|
---|
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 | }
|
---|
1270 |
|
---|
1271 | static void goto_match(int match)
|
---|
1272 | {
|
---|
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) {
|
---|
1279 | wanted_match = match; /* "I want to read until I see N'th match" */
|
---|
1280 | read_lines();
|
---|
1281 | }
|
---|
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 | }
|
---|
1288 | }
|
---|
1289 |
|
---|
1290 | static void fill_match_lines(unsigned pos)
|
---|
1291 | {
|
---|
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 | ) {
|
---|
1301 | match_lines = xrealloc_vector(match_lines, 4, num_matches);
|
---|
1302 | match_lines[num_matches++] = pos;
|
---|
1303 | }
|
---|
1304 | pos++;
|
---|
1305 | }
|
---|
1306 | }
|
---|
1307 |
|
---|
1308 | static void regex_process(void)
|
---|
1309 | {
|
---|
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 |
|
---|
1322 | /* Get the uncompiled regular expression from the user */
|
---|
1323 | clear_line();
|
---|
1324 | bb_putchar((option_mask32 & LESS_STATE_MATCH_BACKWARDS) ? '?' : '/');
|
---|
1325 | uncomp_regex = less_gets(1);
|
---|
1326 | if (!uncomp_regex[0]) {
|
---|
1327 | free(uncomp_regex);
|
---|
1328 | buffer_print();
|
---|
1329 | return;
|
---|
1330 | }
|
---|
1331 |
|
---|
1332 | /* Compile the regex and check for errors */
|
---|
1333 | err = regcomp_or_errmsg(&pattern, uncomp_regex,
|
---|
1334 | (option_mask32 & FLAG_I) ? REG_ICASE : 0);
|
---|
1335 | free(uncomp_regex);
|
---|
1336 | if (err) {
|
---|
1337 | print_statusline(err);
|
---|
1338 | free(err);
|
---|
1339 | return;
|
---|
1340 | }
|
---|
1341 |
|
---|
1342 | pattern_valid = 1;
|
---|
1343 | match_pos = 0;
|
---|
1344 | fill_match_lines(0);
|
---|
1345 | while (match_pos < num_matches) {
|
---|
1346 | if ((int)match_lines[match_pos] > cur_fline)
|
---|
1347 | break;
|
---|
1348 | match_pos++;
|
---|
1349 | }
|
---|
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);
|
---|
1357 | }
|
---|
1358 | #endif
|
---|
1359 |
|
---|
1360 | static void number_process(int first_digit)
|
---|
1361 | {
|
---|
1362 | unsigned i;
|
---|
1363 | int num;
|
---|
1364 | int keypress;
|
---|
1365 | char num_input[sizeof(int)*4]; /* more than enough */
|
---|
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 |
|
---|
1373 | /* Receive input until a letter is given */
|
---|
1374 | i = 1;
|
---|
1375 | while (i < sizeof(num_input)-1) {
|
---|
1376 | keypress = less_getch(i + 1);
|
---|
1377 | if ((unsigned)keypress > 255 || !isdigit(keypress))
|
---|
1378 | break;
|
---|
1379 | num_input[i] = keypress;
|
---|
1380 | bb_putchar(keypress);
|
---|
1381 | i++;
|
---|
1382 | }
|
---|
1383 |
|
---|
1384 | num_input[i] = '\0';
|
---|
1385 | num = bb_strtou(num_input, NULL, 10);
|
---|
1386 | /* on format error, num == -1 */
|
---|
1387 | if (num < 1 || num > MAXLINES) {
|
---|
1388 | buffer_print();
|
---|
1389 | return;
|
---|
1390 | }
|
---|
1391 |
|
---|
1392 | /* We now know the number and the letter entered, so we process them */
|
---|
1393 | switch (keypress) {
|
---|
1394 | case KEYCODE_DOWN: case 'z': case 'd': case 'e': case ' ': case '\015':
|
---|
1395 | buffer_down(num);
|
---|
1396 | break;
|
---|
1397 | case KEYCODE_UP: case 'b': case 'w': case 'y': case 'u':
|
---|
1398 | buffer_up(num);
|
---|
1399 | break;
|
---|
1400 | case 'g': case '<': case 'G': case '>':
|
---|
1401 | buffer_lineno(num - 1);
|
---|
1402 | break;
|
---|
1403 | case 'p': case '%':
|
---|
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);
|
---|
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;
|
---|
1424 | #endif
|
---|
1425 | }
|
---|
1426 | }
|
---|
1427 |
|
---|
1428 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
1429 | static void flag_change(void)
|
---|
1430 | {
|
---|
1431 | int keypress;
|
---|
1432 |
|
---|
1433 | clear_line();
|
---|
1434 | bb_putchar('-');
|
---|
1435 | keypress = less_getch(1);
|
---|
1436 |
|
---|
1437 | switch (keypress) {
|
---|
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;
|
---|
1450 | #if ENABLE_FEATURE_LESS_TRUNCATE
|
---|
1451 | case 'S':
|
---|
1452 | option_mask32 ^= FLAG_S;
|
---|
1453 | buffer_fill_and_print();
|
---|
1454 | break;
|
---|
1455 | #endif
|
---|
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
|
---|
1463 | }
|
---|
1464 | }
|
---|
1465 |
|
---|
1466 | #ifdef BLOAT
|
---|
1467 | static void show_flag_status(void)
|
---|
1468 | {
|
---|
1469 | int keypress;
|
---|
1470 | int flag_val;
|
---|
1471 |
|
---|
1472 | clear_line();
|
---|
1473 | bb_putchar('_');
|
---|
1474 | keypress = less_getch(1);
|
---|
1475 |
|
---|
1476 | switch (keypress) {
|
---|
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;
|
---|
1495 | }
|
---|
1496 |
|
---|
1497 | clear_line();
|
---|
1498 | printf(HIGHLIGHT"The status of the flag is: %u"NORMAL, flag_val != 0);
|
---|
1499 | }
|
---|
1500 | #endif
|
---|
1501 |
|
---|
1502 | #endif /* ENABLE_FEATURE_LESS_DASHCMD */
|
---|
1503 |
|
---|
1504 | static void save_input_to_file(void)
|
---|
1505 | {
|
---|
1506 | const char *msg = "";
|
---|
1507 | char *current_line;
|
---|
1508 | unsigned i;
|
---|
1509 | FILE *fp;
|
---|
1510 |
|
---|
1511 | print_statusline("Log file: ");
|
---|
1512 | current_line = less_gets(sizeof("Log file: ")-1);
|
---|
1513 | if (current_line[0]) {
|
---|
1514 | fp = fopen_for_write(current_line);
|
---|
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]);
|
---|
1521 | fclose(fp);
|
---|
1522 | msg = "Done";
|
---|
1523 | }
|
---|
1524 | ret:
|
---|
1525 | print_statusline(msg);
|
---|
1526 | free(current_line);
|
---|
1527 | }
|
---|
1528 |
|
---|
1529 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
1530 | static void add_mark(void)
|
---|
1531 | {
|
---|
1532 | int letter;
|
---|
1533 |
|
---|
1534 | print_statusline("Mark: ");
|
---|
1535 | letter = less_getch(sizeof("Mark: ") - 1);
|
---|
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;
|
---|
1543 | mark_lines[num_marks][1] = cur_fline;
|
---|
1544 | num_marks++;
|
---|
1545 | } else {
|
---|
1546 | print_statusline("Invalid mark letter");
|
---|
1547 | }
|
---|
1548 | }
|
---|
1549 |
|
---|
1550 | static void goto_mark(void)
|
---|
1551 | {
|
---|
1552 | int letter;
|
---|
1553 | int i;
|
---|
1554 |
|
---|
1555 | print_statusline("Go to mark: ");
|
---|
1556 | letter = less_getch(sizeof("Go to mark: ") - 1);
|
---|
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 | }
|
---|
1565 | if (num_marks == 14 && letter != mark_lines[14][0])
|
---|
1566 | print_statusline("Mark not set");
|
---|
1567 | } else
|
---|
1568 | print_statusline("Invalid mark letter");
|
---|
1569 | }
|
---|
1570 | #endif
|
---|
1571 |
|
---|
1572 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
1573 | static char opp_bracket(char bracket)
|
---|
1574 | {
|
---|
1575 | switch (bracket) {
|
---|
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;
|
---|
1588 | }
|
---|
1589 |
|
---|
1590 | static void match_right_bracket(char bracket)
|
---|
1591 | {
|
---|
1592 | unsigned i;
|
---|
1593 |
|
---|
1594 | if (strchr(flines[cur_fline], bracket) == NULL) {
|
---|
1595 | print_statusline("No bracket in top line");
|
---|
1596 | return;
|
---|
1597 | }
|
---|
1598 | bracket = opp_bracket(bracket);
|
---|
1599 | for (i = cur_fline + 1; i < max_fline; i++) {
|
---|
1600 | if (strchr(flines[i], bracket) != NULL) {
|
---|
1601 | buffer_line(i);
|
---|
1602 | return;
|
---|
1603 | }
|
---|
1604 | }
|
---|
1605 | print_statusline("No matching bracket found");
|
---|
1606 | }
|
---|
1607 |
|
---|
1608 | static void match_left_bracket(char bracket)
|
---|
1609 | {
|
---|
1610 | int i;
|
---|
1611 |
|
---|
1612 | if (strchr(flines[cur_fline + max_displayed_line], bracket) == NULL) {
|
---|
1613 | print_statusline("No bracket in bottom line");
|
---|
1614 | return;
|
---|
1615 | }
|
---|
1616 |
|
---|
1617 | bracket = opp_bracket(bracket);
|
---|
1618 | for (i = cur_fline + max_displayed_line; i >= 0; i--) {
|
---|
1619 | if (strchr(flines[i], bracket) != NULL) {
|
---|
1620 | buffer_line(i);
|
---|
1621 | return;
|
---|
1622 | }
|
---|
1623 | }
|
---|
1624 | print_statusline("No matching bracket found");
|
---|
1625 | }
|
---|
1626 | #endif /* FEATURE_LESS_BRACKETS */
|
---|
1627 |
|
---|
1628 | static void keypress_process(int keypress)
|
---|
1629 | {
|
---|
1630 | switch (keypress) {
|
---|
1631 | case KEYCODE_DOWN: case 'e': case 'j': case 0x0d:
|
---|
1632 | buffer_down(1);
|
---|
1633 | break;
|
---|
1634 | case KEYCODE_UP: case 'y': case 'k':
|
---|
1635 | buffer_up(1);
|
---|
1636 | break;
|
---|
1637 | case KEYCODE_PAGEDOWN: case ' ': case 'z': case 'f':
|
---|
1638 | buffer_down(max_displayed_line + 1);
|
---|
1639 | break;
|
---|
1640 | case KEYCODE_PAGEUP: case 'w': case 'b':
|
---|
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;
|
---|
1649 | case KEYCODE_HOME: case 'g': case 'p': case '<': case '%':
|
---|
1650 | buffer_line(0);
|
---|
1651 | break;
|
---|
1652 | case KEYCODE_END: case 'G': case '>':
|
---|
1653 | cur_fline = MAXLINES;
|
---|
1654 | read_lines();
|
---|
1655 | buffer_line(cur_fline);
|
---|
1656 | break;
|
---|
1657 | case 'q': case 'Q':
|
---|
1658 | less_exit(EXIT_SUCCESS);
|
---|
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;
|
---|
1669 | #endif
|
---|
1670 | case 'r': case 'R':
|
---|
1671 | /* TODO: (1) also bind ^R, ^L to this?
|
---|
1672 | * (2) re-measure window size?
|
---|
1673 | */
|
---|
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;
|
---|
1689 | #endif
|
---|
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;
|
---|
1705 | #endif
|
---|
1706 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
1707 | case '-':
|
---|
1708 | flag_change();
|
---|
1709 | buffer_print();
|
---|
1710 | break;
|
---|
1711 | #ifdef BLOAT
|
---|
1712 | case '_':
|
---|
1713 | show_flag_status();
|
---|
1714 | break;
|
---|
1715 | #endif
|
---|
1716 | #endif
|
---|
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;
|
---|
1724 | #endif
|
---|
1725 | case ':':
|
---|
1726 | colon_process();
|
---|
1727 | break;
|
---|
1728 | }
|
---|
1729 |
|
---|
1730 | if (isdigit(keypress))
|
---|
1731 | number_process(keypress);
|
---|
1732 | }
|
---|
1733 |
|
---|
1734 | static void sig_catcher(int sig)
|
---|
1735 | {
|
---|
1736 | less_exit(- sig);
|
---|
1737 | }
|
---|
1738 |
|
---|
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;
|
---|
1747 | int less_main(int argc, char **argv)
|
---|
1748 | {
|
---|
1749 | char *tty_name;
|
---|
1750 | int tty_fd;
|
---|
1751 |
|
---|
1752 | INIT_G();
|
---|
1753 |
|
---|
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");
|
---|
1761 | argc -= optind;
|
---|
1762 | argv += optind;
|
---|
1763 | num_files = argc;
|
---|
1764 | files = argv;
|
---|
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 |
|
---|
1771 | if (!num_files) {
|
---|
1772 | if (isatty(STDIN_FILENO)) {
|
---|
1773 | /* Just "less"? No args and no redirection? */
|
---|
1774 | bb_error_msg("missing filename");
|
---|
1775 | bb_show_usage();
|
---|
1776 | }
|
---|
1777 | } else {
|
---|
1778 | filename = xstrdup(files[0]);
|
---|
1779 | }
|
---|
1780 |
|
---|
1781 | if (option_mask32 & FLAG_TILDE)
|
---|
1782 | empty_line_marker = "";
|
---|
1783 |
|
---|
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 */
|
---|
1806 |
|
---|
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 |
|
---|
1815 | IF_FEATURE_LESS_ASK_TERMINAL(G.winsize_err =) get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
1816 | /* 20: two tabstops + 4 */
|
---|
1817 | if (width < 20 || max_displayed_line < 3)
|
---|
1818 | return bb_cat(argv);
|
---|
1819 | max_displayed_line -= 2;
|
---|
1820 |
|
---|
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 *));
|
---|
1828 | reinitialize();
|
---|
1829 | while (1) {
|
---|
1830 | int64_t keypress;
|
---|
1831 |
|
---|
1832 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
1833 | while (WINCH_COUNTER) {
|
---|
1834 | again:
|
---|
1835 | winch_counter--;
|
---|
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:)
|
---|
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 | }
|
---|
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 */
|
---|
1868 | #endif
|
---|
1869 | keypress_process(keypress);
|
---|
1870 | }
|
---|
1871 | }
|
---|
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
|
---|
1970 | character preceded by a -, or a name preceded by --.
|
---|
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.
|
---|
1999 | -I ........ --IGNORE-CASE
|
---|
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]
|
---|
2006 | Use a lesskey file.
|
---|
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 | */
|
---|