1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini less implementation for busybox
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4 | *
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5 | * Copyright (C) 2005 by Rob Sullivan <cogito.ergo.cogito@gmail.com>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | /*
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11 | * TODO:
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12 | * - Add more regular expression support - search modifiers, certain matches, etc.
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13 | * - Add more complex bracket searching - currently, nested brackets are
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14 | * not considered.
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15 | * - Add support for "F" as an input. This causes less to act in
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16 | * a similar way to tail -f.
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17 | * - Allow horizontal scrolling.
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18 | *
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19 | * Notes:
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20 | * - the inp file pointer is used so that keyboard input works after
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21 | * redirected input has been read from stdin
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22 | */
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23 |
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24 | #include <sched.h> /* sched_yield() */
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25 |
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26 | #include "libbb.h"
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27 | #if ENABLE_FEATURE_LESS_REGEXP
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28 | #include "xregex.h"
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29 | #endif
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30 |
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31 |
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32 | #define ESC "\033"
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33 | /* The escape codes for highlighted and normal text */
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34 | #define HIGHLIGHT ESC"[7m"
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35 | #define NORMAL ESC"[0m"
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36 | /* The escape code to home and clear to the end of screen */
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37 | #define CLEAR ESC"[H\033[J"
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38 | /* The escape code to clear to the end of line */
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39 | #define CLEAR_2_EOL ESC"[K"
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40 |
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41 | enum {
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42 | /* Absolute max of lines eaten */
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43 | MAXLINES = CONFIG_FEATURE_LESS_MAXLINES,
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44 | /* This many "after the end" lines we will show (at max) */
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45 | TILDES = 1,
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46 | };
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47 |
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48 | /* Command line options */
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49 | enum {
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50 | FLAG_E = 1 << 0,
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51 | FLAG_M = 1 << 1,
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52 | FLAG_m = 1 << 2,
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53 | FLAG_N = 1 << 3,
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54 | FLAG_TILDE = 1 << 4,
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55 | FLAG_I = 1 << 5,
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56 | FLAG_S = (1 << 6) * ENABLE_FEATURE_LESS_DASHCMD,
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57 | /* hijack command line options variable for internal state vars */
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58 | LESS_STATE_MATCH_BACKWARDS = 1 << 15,
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59 | };
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60 |
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61 | #if !ENABLE_FEATURE_LESS_REGEXP
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62 | enum { pattern_valid = 0 };
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63 | #endif
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64 |
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65 | struct globals {
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66 | int cur_fline; /* signed */
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67 | int kbd_fd; /* fd to get input from */
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68 | int less_gets_pos;
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69 | /* last position in last line, taking into account tabs */
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70 | size_t last_line_pos;
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71 | unsigned max_fline;
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72 | unsigned max_lineno; /* this one tracks linewrap */
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73 | unsigned max_displayed_line;
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74 | unsigned width;
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75 | #if ENABLE_FEATURE_LESS_WINCH
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76 | unsigned winch_counter;
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77 | #endif
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78 | ssize_t eof_error; /* eof if 0, error if < 0 */
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79 | ssize_t readpos;
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80 | ssize_t readeof; /* must be signed */
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81 | const char **buffer;
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82 | const char **flines;
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83 | const char *empty_line_marker;
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84 | unsigned num_files;
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85 | unsigned current_file;
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86 | char *filename;
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87 | char **files;
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88 | #if ENABLE_FEATURE_LESS_MARKS
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89 | unsigned num_marks;
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90 | unsigned mark_lines[15][2];
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91 | #endif
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92 | #if ENABLE_FEATURE_LESS_REGEXP
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93 | unsigned *match_lines;
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94 | int match_pos; /* signed! */
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95 | int wanted_match; /* signed! */
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96 | int num_matches;
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97 | regex_t pattern;
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98 | smallint pattern_valid;
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99 | #endif
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100 | smallint terminated;
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101 | struct termios term_orig, term_less;
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102 | char kbd_input[KEYCODE_BUFFER_SIZE];
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103 | };
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104 | #define G (*ptr_to_globals)
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105 | #define cur_fline (G.cur_fline )
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106 | #define kbd_fd (G.kbd_fd )
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107 | #define less_gets_pos (G.less_gets_pos )
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108 | #define last_line_pos (G.last_line_pos )
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109 | #define max_fline (G.max_fline )
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110 | #define max_lineno (G.max_lineno )
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111 | #define max_displayed_line (G.max_displayed_line)
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112 | #define width (G.width )
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113 | #define winch_counter (G.winch_counter )
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114 | /* This one is 100% not cached by compiler on read access */
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115 | #define WINCH_COUNTER (*(volatile unsigned *)&winch_counter)
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116 | #define eof_error (G.eof_error )
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117 | #define readpos (G.readpos )
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118 | #define readeof (G.readeof )
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119 | #define buffer (G.buffer )
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120 | #define flines (G.flines )
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121 | #define empty_line_marker (G.empty_line_marker )
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122 | #define num_files (G.num_files )
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123 | #define current_file (G.current_file )
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124 | #define filename (G.filename )
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125 | #define files (G.files )
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126 | #define num_marks (G.num_marks )
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127 | #define mark_lines (G.mark_lines )
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128 | #if ENABLE_FEATURE_LESS_REGEXP
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129 | #define match_lines (G.match_lines )
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130 | #define match_pos (G.match_pos )
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131 | #define num_matches (G.num_matches )
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132 | #define wanted_match (G.wanted_match )
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133 | #define pattern (G.pattern )
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134 | #define pattern_valid (G.pattern_valid )
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135 | #endif
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136 | #define terminated (G.terminated )
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137 | #define term_orig (G.term_orig )
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138 | #define term_less (G.term_less )
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139 | #define kbd_input (G.kbd_input )
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140 | #define INIT_G() do { \
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141 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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142 | less_gets_pos = -1; \
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143 | empty_line_marker = "~"; \
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144 | num_files = 1; \
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145 | current_file = 1; \
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146 | eof_error = 1; \
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147 | terminated = 1; \
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148 | IF_FEATURE_LESS_REGEXP(wanted_match = -1;) \
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149 | } while (0)
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150 |
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151 | /* flines[] are lines read from stdin, each in malloc'ed buffer.
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152 | * Line numbers are stored as uint32_t prepended to each line.
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153 | * Pointer is adjusted so that flines[i] points directly past
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154 | * line number. Accesor: */
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155 | #define MEMPTR(p) ((char*)(p) - 4)
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156 | #define LINENO(p) (*(uint32_t*)((p) - 4))
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157 |
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158 |
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159 | /* Reset terminal input to normal */
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160 | static void set_tty_cooked(void)
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161 | {
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162 | fflush_all();
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163 | tcsetattr(kbd_fd, TCSANOW, &term_orig);
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164 | }
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165 |
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166 | /* Move the cursor to a position (x,y), where (0,0) is the
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167 | top-left corner of the console */
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168 | static void move_cursor(int line, int row)
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169 | {
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170 | printf(ESC"[%u;%uH", line, row);
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171 | }
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172 |
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173 | static void clear_line(void)
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174 | {
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175 | printf(ESC"[%u;0H" CLEAR_2_EOL, max_displayed_line + 2);
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176 | }
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177 |
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178 | static void print_hilite(const char *str)
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179 | {
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180 | printf(HIGHLIGHT"%s"NORMAL, str);
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181 | }
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182 |
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183 | static void print_statusline(const char *str)
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184 | {
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185 | clear_line();
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186 | printf(HIGHLIGHT"%.*s"NORMAL, width - 1, str);
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187 | }
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188 |
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189 | /* Exit the program gracefully */
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190 | static void less_exit(int code)
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191 | {
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192 | set_tty_cooked();
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193 | clear_line();
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194 | if (code < 0)
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195 | kill_myself_with_sig(- code); /* does not return */
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196 | exit(code);
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197 | }
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198 |
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199 | #if (ENABLE_FEATURE_LESS_DASHCMD && ENABLE_FEATURE_LESS_LINENUMS) \
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200 | || ENABLE_FEATURE_LESS_WINCH
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201 | static void re_wrap(void)
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202 | {
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203 | int w = width;
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204 | int new_line_pos;
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205 | int src_idx;
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206 | int dst_idx;
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207 | int new_cur_fline = 0;
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208 | uint32_t lineno;
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209 | char linebuf[w + 1];
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210 | const char **old_flines = flines;
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211 | const char *s;
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212 | char **new_flines = NULL;
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213 | char *d;
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214 |
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215 | if (option_mask32 & FLAG_N)
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216 | w -= 8;
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217 |
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218 | src_idx = 0;
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219 | dst_idx = 0;
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220 | s = old_flines[0];
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221 | lineno = LINENO(s);
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222 | d = linebuf;
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223 | new_line_pos = 0;
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224 | while (1) {
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225 | *d = *s;
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226 | if (*d != '\0') {
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227 | new_line_pos++;
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228 | if (*d == '\t') /* tab */
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229 | new_line_pos += 7;
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230 | s++;
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231 | d++;
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232 | if (new_line_pos >= w) {
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233 | int sz;
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234 | /* new line is full, create next one */
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235 | *d = '\0';
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236 | next_new:
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237 | sz = (d - linebuf) + 1; /* + 1: NUL */
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238 | d = ((char*)xmalloc(sz + 4)) + 4;
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239 | LINENO(d) = lineno;
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240 | memcpy(d, linebuf, sz);
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241 | new_flines = xrealloc_vector(new_flines, 8, dst_idx);
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242 | new_flines[dst_idx] = d;
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243 | dst_idx++;
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244 | if (new_line_pos < w) {
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245 | /* if we came here thru "goto next_new" */
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246 | if (src_idx > max_fline)
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247 | break;
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248 | lineno = LINENO(s);
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249 | }
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250 | d = linebuf;
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251 | new_line_pos = 0;
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252 | }
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253 | continue;
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254 | }
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255 | /* *d == NUL: old line ended, go to next old one */
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256 | free(MEMPTR(old_flines[src_idx]));
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257 | /* btw, convert cur_fline... */
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258 | if (cur_fline == src_idx)
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259 | new_cur_fline = dst_idx;
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260 | src_idx++;
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261 | /* no more lines? finish last new line (and exit the loop) */
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262 | if (src_idx > max_fline)
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263 | goto next_new;
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264 | s = old_flines[src_idx];
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265 | if (lineno != LINENO(s)) {
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266 | /* this is not a continuation line!
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267 | * create next _new_ line too */
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268 | goto next_new;
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269 | }
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270 | }
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271 |
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272 | free(old_flines);
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273 | flines = (const char **)new_flines;
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274 |
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275 | max_fline = dst_idx - 1;
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276 | last_line_pos = new_line_pos;
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277 | cur_fline = new_cur_fline;
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278 | /* max_lineno is screen-size independent */
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279 | #if ENABLE_FEATURE_LESS_REGEXP
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280 | pattern_valid = 0;
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281 | #endif
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282 | }
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283 | #endif
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284 |
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285 | #if ENABLE_FEATURE_LESS_REGEXP
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286 | static void fill_match_lines(unsigned pos);
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287 | #else
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288 | #define fill_match_lines(pos) ((void)0)
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289 | #endif
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290 |
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291 | /* Devilishly complex routine.
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292 | *
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293 | * Has to deal with EOF and EPIPE on input,
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294 | * with line wrapping, with last line not ending in '\n'
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295 | * (possibly not ending YET!), with backspace and tabs.
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296 | * It reads input again if last time we got an EOF (thus supporting
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297 | * growing files) or EPIPE (watching output of slow process like make).
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298 | *
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299 | * Variables used:
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300 | * flines[] - array of lines already read. Linewrap may cause
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301 | * one source file line to occupy several flines[n].
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302 | * flines[max_fline] - last line, possibly incomplete.
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303 | * terminated - 1 if flines[max_fline] is 'terminated'
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304 | * (if there was '\n' [which isn't stored itself, we just remember
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305 | * that it was seen])
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306 | * max_lineno - last line's number, this one doesn't increment
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307 | * on line wrap, only on "real" new lines.
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308 | * readbuf[0..readeof-1] - small preliminary buffer.
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309 | * readbuf[readpos] - next character to add to current line.
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310 | * last_line_pos - screen line position of next char to be read
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311 | * (takes into account tabs and backspaces)
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312 | * eof_error - < 0 error, == 0 EOF, > 0 not EOF/error
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313 | */
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314 | static void read_lines(void)
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315 | {
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316 | #define readbuf bb_common_bufsiz1
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317 | char *current_line, *p;
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318 | int w = width;
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319 | char last_terminated = terminated;
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320 | #if ENABLE_FEATURE_LESS_REGEXP
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321 | unsigned old_max_fline = max_fline;
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322 | time_t last_time = 0;
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323 | unsigned seconds_p1 = 3; /* seconds_to_loop + 1 */
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324 | #endif
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325 |
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326 | if (option_mask32 & FLAG_N)
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327 | w -= 8;
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328 |
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329 | IF_FEATURE_LESS_REGEXP(again0:)
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330 |
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331 | p = current_line = ((char*)xmalloc(w + 4)) + 4;
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332 | max_fline += last_terminated;
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333 | if (!last_terminated) {
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334 | const char *cp = flines[max_fline];
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335 | strcpy(p, cp);
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336 | p += strlen(current_line);
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337 | free(MEMPTR(flines[max_fline]));
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338 | /* last_line_pos is still valid from previous read_lines() */
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339 | } else {
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340 | last_line_pos = 0;
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341 | }
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342 |
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343 | while (1) { /* read lines until we reach cur_fline or wanted_match */
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344 | *p = '\0';
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345 | terminated = 0;
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346 | while (1) { /* read chars until we have a line */
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347 | char c;
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348 | /* if no unprocessed chars left, eat more */
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349 | if (readpos >= readeof) {
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350 | ndelay_on(0);
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351 | eof_error = safe_read(STDIN_FILENO, readbuf, sizeof(readbuf));
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352 | ndelay_off(0);
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353 | readpos = 0;
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354 | readeof = eof_error;
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355 | if (eof_error <= 0)
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356 | goto reached_eof;
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357 | }
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358 | c = readbuf[readpos];
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359 | /* backspace? [needed for manpages] */
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360 | /* <tab><bs> is (a) insane and */
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361 | /* (b) harder to do correctly, so we refuse to do it */
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362 | if (c == '\x8' && last_line_pos && p[-1] != '\t') {
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363 | readpos++; /* eat it */
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364 | last_line_pos--;
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365 | /* was buggy (p could end up <= current_line)... */
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366 | *--p = '\0';
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367 | continue;
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368 | }
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369 | {
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370 | size_t new_last_line_pos = last_line_pos + 1;
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371 | if (c == '\t') {
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372 | new_last_line_pos += 7;
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373 | new_last_line_pos &= (~7);
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374 | }
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375 | if ((int)new_last_line_pos >= w)
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376 | break;
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377 | last_line_pos = new_last_line_pos;
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378 | }
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379 | /* ok, we will eat this char */
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380 | readpos++;
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381 | if (c == '\n') {
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382 | terminated = 1;
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383 | last_line_pos = 0;
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384 | break;
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385 | }
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386 | /* NUL is substituted by '\n'! */
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387 | if (c == '\0') c = '\n';
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388 | *p++ = c;
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389 | *p = '\0';
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390 | } /* end of "read chars until we have a line" loop */
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391 | /* Corner case: linewrap with only "" wrapping to next line */
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392 | /* Looks ugly on screen, so we do not store this empty line */
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393 | if (!last_terminated && !current_line[0]) {
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394 | last_terminated = 1;
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395 | max_lineno++;
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396 | continue;
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397 | }
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398 | reached_eof:
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399 | last_terminated = terminated;
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400 | flines = xrealloc_vector(flines, 8, max_fline);
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401 |
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402 | flines[max_fline] = (char*)xrealloc(MEMPTR(current_line), strlen(current_line) + 1 + 4) + 4;
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403 | LINENO(flines[max_fline]) = max_lineno;
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404 | if (terminated)
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405 | max_lineno++;
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406 |
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407 | if (max_fline >= MAXLINES) {
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408 | eof_error = 0; /* Pretend we saw EOF */
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409 | break;
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410 | }
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411 | if (!(option_mask32 & FLAG_S)
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412 | ? (max_fline > cur_fline + max_displayed_line)
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413 | : (max_fline >= cur_fline
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414 | && max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
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415 | ) {
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416 | #if !ENABLE_FEATURE_LESS_REGEXP
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417 | break;
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418 | #else
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419 | if (wanted_match >= num_matches) { /* goto_match called us */
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420 | fill_match_lines(old_max_fline);
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421 | old_max_fline = max_fline;
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422 | }
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423 | if (wanted_match < num_matches)
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424 | break;
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425 | #endif
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426 | }
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427 | if (eof_error <= 0) {
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428 | if (eof_error < 0) {
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429 | if (errno == EAGAIN) {
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430 | /* not yet eof or error, reset flag (or else
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431 | * we will hog CPU - select() will return
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432 | * immediately */
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433 | eof_error = 1;
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434 | } else {
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435 | print_statusline(bb_msg_read_error);
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436 | }
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437 | }
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438 | #if !ENABLE_FEATURE_LESS_REGEXP
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439 | break;
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440 | #else
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441 | if (wanted_match < num_matches) {
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442 | break;
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443 | } else { /* goto_match called us */
|
---|
444 | time_t t = time(NULL);
|
---|
445 | if (t != last_time) {
|
---|
446 | last_time = t;
|
---|
447 | if (--seconds_p1 == 0)
|
---|
448 | break;
|
---|
449 | }
|
---|
450 | sched_yield();
|
---|
451 | goto again0; /* go loop again (max 2 seconds) */
|
---|
452 | }
|
---|
453 | #endif
|
---|
454 | }
|
---|
455 | max_fline++;
|
---|
456 | current_line = ((char*)xmalloc(w + 4)) + 4;
|
---|
457 | p = current_line;
|
---|
458 | last_line_pos = 0;
|
---|
459 | } /* end of "read lines until we reach cur_fline" loop */
|
---|
460 | fill_match_lines(old_max_fline);
|
---|
461 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
462 | /* prevent us from being stuck in search for a match */
|
---|
463 | wanted_match = -1;
|
---|
464 | #endif
|
---|
465 | #undef readbuf
|
---|
466 | }
|
---|
467 |
|
---|
468 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
469 | /* Interestingly, writing calc_percent as a function saves around 32 bytes
|
---|
470 | * on my build. */
|
---|
471 | static int calc_percent(void)
|
---|
472 | {
|
---|
473 | unsigned p = (100 * (cur_fline+max_displayed_line+1) + max_fline/2) / (max_fline+1);
|
---|
474 | return p <= 100 ? p : 100;
|
---|
475 | }
|
---|
476 |
|
---|
477 | /* Print a status line if -M was specified */
|
---|
478 | static void m_status_print(void)
|
---|
479 | {
|
---|
480 | int percentage;
|
---|
481 |
|
---|
482 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
483 | return;
|
---|
484 |
|
---|
485 | clear_line();
|
---|
486 | printf(HIGHLIGHT"%s", filename);
|
---|
487 | if (num_files > 1)
|
---|
488 | printf(" (file %i of %i)", current_file, num_files);
|
---|
489 | printf(" lines %i-%i/%i ",
|
---|
490 | cur_fline + 1, cur_fline + max_displayed_line + 1,
|
---|
491 | max_fline + 1);
|
---|
492 | if (cur_fline >= (int)(max_fline - max_displayed_line)) {
|
---|
493 | printf("(END)"NORMAL);
|
---|
494 | if (num_files > 1 && current_file != num_files)
|
---|
495 | printf(HIGHLIGHT" - next: %s"NORMAL, files[current_file]);
|
---|
496 | return;
|
---|
497 | }
|
---|
498 | percentage = calc_percent();
|
---|
499 | printf("%i%%"NORMAL, percentage);
|
---|
500 | }
|
---|
501 | #endif
|
---|
502 |
|
---|
503 | /* Print the status line */
|
---|
504 | static void status_print(void)
|
---|
505 | {
|
---|
506 | const char *p;
|
---|
507 |
|
---|
508 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
509 | return;
|
---|
510 |
|
---|
511 | /* Change the status if flags have been set */
|
---|
512 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
513 | if (option_mask32 & (FLAG_M|FLAG_m)) {
|
---|
514 | m_status_print();
|
---|
515 | return;
|
---|
516 | }
|
---|
517 | /* No flags set */
|
---|
518 | #endif
|
---|
519 |
|
---|
520 | clear_line();
|
---|
521 | if (cur_fline && cur_fline < (int)(max_fline - max_displayed_line)) {
|
---|
522 | bb_putchar(':');
|
---|
523 | return;
|
---|
524 | }
|
---|
525 | p = "(END)";
|
---|
526 | if (!cur_fline)
|
---|
527 | p = filename;
|
---|
528 | if (num_files > 1) {
|
---|
529 | printf(HIGHLIGHT"%s (file %i of %i)"NORMAL,
|
---|
530 | p, current_file, num_files);
|
---|
531 | return;
|
---|
532 | }
|
---|
533 | print_hilite(p);
|
---|
534 | }
|
---|
535 |
|
---|
536 | static void cap_cur_fline(int nlines)
|
---|
537 | {
|
---|
538 | int diff;
|
---|
539 | if (cur_fline < 0)
|
---|
540 | cur_fline = 0;
|
---|
541 | if (cur_fline + max_displayed_line > max_fline + TILDES) {
|
---|
542 | cur_fline -= nlines;
|
---|
543 | if (cur_fline < 0)
|
---|
544 | cur_fline = 0;
|
---|
545 | diff = max_fline - (cur_fline + max_displayed_line) + TILDES;
|
---|
546 | /* As the number of lines requested was too large, we just move
|
---|
547 | * to the end of the file */
|
---|
548 | if (diff > 0)
|
---|
549 | cur_fline += diff;
|
---|
550 | }
|
---|
551 | }
|
---|
552 |
|
---|
553 | static const char controls[] ALIGN1 =
|
---|
554 | /* NUL: never encountered; TAB: not converted */
|
---|
555 | /**/"\x01\x02\x03\x04\x05\x06\x07\x08" "\x0a\x0b\x0c\x0d\x0e\x0f"
|
---|
556 | "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
|
---|
557 | "\x7f\x9b"; /* DEL and infamous Meta-ESC :( */
|
---|
558 | static const char ctrlconv[] ALIGN1 =
|
---|
559 | /* why 40 instead of 4a below? - it is a replacement for '\n'.
|
---|
560 | * '\n' is a former NUL - we subst it with @, not J */
|
---|
561 | "\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x40\x4b\x4c\x4d\x4e\x4f"
|
---|
562 | "\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f";
|
---|
563 |
|
---|
564 | static void lineno_str(char *nbuf9, const char *line)
|
---|
565 | {
|
---|
566 | nbuf9[0] = '\0';
|
---|
567 | if (option_mask32 & FLAG_N) {
|
---|
568 | const char *fmt;
|
---|
569 | unsigned n;
|
---|
570 |
|
---|
571 | if (line == empty_line_marker) {
|
---|
572 | memset(nbuf9, ' ', 8);
|
---|
573 | nbuf9[8] = '\0';
|
---|
574 | return;
|
---|
575 | }
|
---|
576 | /* Width of 7 preserves tab spacing in the text */
|
---|
577 | fmt = "%7u ";
|
---|
578 | n = LINENO(line) + 1;
|
---|
579 | if (n > 9999999) {
|
---|
580 | n %= 10000000;
|
---|
581 | fmt = "%07u ";
|
---|
582 | }
|
---|
583 | sprintf(nbuf9, fmt, n);
|
---|
584 | }
|
---|
585 | }
|
---|
586 |
|
---|
587 |
|
---|
588 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
589 | static void print_found(const char *line)
|
---|
590 | {
|
---|
591 | int match_status;
|
---|
592 | int eflags;
|
---|
593 | char *growline;
|
---|
594 | regmatch_t match_structs;
|
---|
595 |
|
---|
596 | char buf[width];
|
---|
597 | char nbuf9[9];
|
---|
598 | const char *str = line;
|
---|
599 | char *p = buf;
|
---|
600 | size_t n;
|
---|
601 |
|
---|
602 | while (*str) {
|
---|
603 | n = strcspn(str, controls);
|
---|
604 | if (n) {
|
---|
605 | if (!str[n]) break;
|
---|
606 | memcpy(p, str, n);
|
---|
607 | p += n;
|
---|
608 | str += n;
|
---|
609 | }
|
---|
610 | n = strspn(str, controls);
|
---|
611 | memset(p, '.', n);
|
---|
612 | p += n;
|
---|
613 | str += n;
|
---|
614 | }
|
---|
615 | strcpy(p, str);
|
---|
616 |
|
---|
617 | /* buf[] holds quarantined version of str */
|
---|
618 |
|
---|
619 | /* Each part of the line that matches has the HIGHLIGHT
|
---|
620 | and NORMAL escape sequences placed around it.
|
---|
621 | NB: we regex against line, but insert text
|
---|
622 | from quarantined copy (buf[]) */
|
---|
623 | str = buf;
|
---|
624 | growline = NULL;
|
---|
625 | eflags = 0;
|
---|
626 | goto start;
|
---|
627 |
|
---|
628 | while (match_status == 0) {
|
---|
629 | char *new = xasprintf("%s%.*s"HIGHLIGHT"%.*s"NORMAL,
|
---|
630 | growline ? growline : "",
|
---|
631 | match_structs.rm_so, str,
|
---|
632 | match_structs.rm_eo - match_structs.rm_so,
|
---|
633 | str + match_structs.rm_so);
|
---|
634 | free(growline);
|
---|
635 | growline = new;
|
---|
636 | str += match_structs.rm_eo;
|
---|
637 | line += match_structs.rm_eo;
|
---|
638 | eflags = REG_NOTBOL;
|
---|
639 | start:
|
---|
640 | /* Most of the time doesn't find the regex, optimize for that */
|
---|
641 | match_status = regexec(&pattern, line, 1, &match_structs, eflags);
|
---|
642 | /* if even "" matches, treat it as "not a match" */
|
---|
643 | if (match_structs.rm_so >= match_structs.rm_eo)
|
---|
644 | match_status = 1;
|
---|
645 | }
|
---|
646 |
|
---|
647 | lineno_str(nbuf9, line);
|
---|
648 | if (!growline) {
|
---|
649 | printf(CLEAR_2_EOL"%s%s\n", nbuf9, str);
|
---|
650 | return;
|
---|
651 | }
|
---|
652 | printf(CLEAR_2_EOL"%s%s%s\n", nbuf9, growline, str);
|
---|
653 | free(growline);
|
---|
654 | }
|
---|
655 | #else
|
---|
656 | void print_found(const char *line);
|
---|
657 | #endif
|
---|
658 |
|
---|
659 | static void print_ascii(const char *str)
|
---|
660 | {
|
---|
661 | char buf[width];
|
---|
662 | char nbuf9[9];
|
---|
663 | char *p;
|
---|
664 | size_t n;
|
---|
665 |
|
---|
666 | lineno_str(nbuf9, str);
|
---|
667 | printf(CLEAR_2_EOL"%s", nbuf9);
|
---|
668 |
|
---|
669 | while (*str) {
|
---|
670 | n = strcspn(str, controls);
|
---|
671 | if (n) {
|
---|
672 | if (!str[n]) break;
|
---|
673 | printf("%.*s", (int) n, str);
|
---|
674 | str += n;
|
---|
675 | }
|
---|
676 | n = strspn(str, controls);
|
---|
677 | p = buf;
|
---|
678 | do {
|
---|
679 | if (*str == 0x7f)
|
---|
680 | *p++ = '?';
|
---|
681 | else if (*str == (char)0x9b)
|
---|
682 | /* VT100's CSI, aka Meta-ESC. Who's inventor? */
|
---|
683 | /* I want to know who committed this sin */
|
---|
684 | *p++ = '{';
|
---|
685 | else
|
---|
686 | *p++ = ctrlconv[(unsigned char)*str];
|
---|
687 | str++;
|
---|
688 | } while (--n);
|
---|
689 | *p = '\0';
|
---|
690 | print_hilite(buf);
|
---|
691 | }
|
---|
692 | puts(str);
|
---|
693 | }
|
---|
694 |
|
---|
695 | /* Print the buffer */
|
---|
696 | static void buffer_print(void)
|
---|
697 | {
|
---|
698 | unsigned i;
|
---|
699 |
|
---|
700 | move_cursor(0, 0);
|
---|
701 | for (i = 0; i <= max_displayed_line; i++)
|
---|
702 | if (pattern_valid)
|
---|
703 | print_found(buffer[i]);
|
---|
704 | else
|
---|
705 | print_ascii(buffer[i]);
|
---|
706 | status_print();
|
---|
707 | }
|
---|
708 |
|
---|
709 | static void buffer_fill_and_print(void)
|
---|
710 | {
|
---|
711 | unsigned i;
|
---|
712 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
713 | int fpos = cur_fline;
|
---|
714 |
|
---|
715 | if (option_mask32 & FLAG_S) {
|
---|
716 | /* Go back to the beginning of this line */
|
---|
717 | while (fpos && LINENO(flines[fpos]) == LINENO(flines[fpos-1]))
|
---|
718 | fpos--;
|
---|
719 | }
|
---|
720 |
|
---|
721 | i = 0;
|
---|
722 | while (i <= max_displayed_line && fpos <= max_fline) {
|
---|
723 | int lineno = LINENO(flines[fpos]);
|
---|
724 | buffer[i] = flines[fpos];
|
---|
725 | i++;
|
---|
726 | do {
|
---|
727 | fpos++;
|
---|
728 | } while ((fpos <= max_fline)
|
---|
729 | && (option_mask32 & FLAG_S)
|
---|
730 | && lineno == LINENO(flines[fpos])
|
---|
731 | );
|
---|
732 | }
|
---|
733 | #else
|
---|
734 | for (i = 0; i <= max_displayed_line && cur_fline + i <= max_fline; i++) {
|
---|
735 | buffer[i] = flines[cur_fline + i];
|
---|
736 | }
|
---|
737 | #endif
|
---|
738 | for (; i <= max_displayed_line; i++) {
|
---|
739 | buffer[i] = empty_line_marker;
|
---|
740 | }
|
---|
741 | buffer_print();
|
---|
742 | }
|
---|
743 |
|
---|
744 | /* Move the buffer up and down in the file in order to scroll */
|
---|
745 | static void buffer_down(int nlines)
|
---|
746 | {
|
---|
747 | cur_fline += nlines;
|
---|
748 | read_lines();
|
---|
749 | cap_cur_fline(nlines);
|
---|
750 | buffer_fill_and_print();
|
---|
751 | }
|
---|
752 |
|
---|
753 | static void buffer_up(int nlines)
|
---|
754 | {
|
---|
755 | cur_fline -= nlines;
|
---|
756 | if (cur_fline < 0) cur_fline = 0;
|
---|
757 | read_lines();
|
---|
758 | buffer_fill_and_print();
|
---|
759 | }
|
---|
760 |
|
---|
761 | static void buffer_line(int linenum)
|
---|
762 | {
|
---|
763 | if (linenum < 0)
|
---|
764 | linenum = 0;
|
---|
765 | cur_fline = linenum;
|
---|
766 | read_lines();
|
---|
767 | if (linenum + max_displayed_line > max_fline)
|
---|
768 | linenum = max_fline - max_displayed_line + TILDES;
|
---|
769 | if (linenum < 0)
|
---|
770 | linenum = 0;
|
---|
771 | cur_fline = linenum;
|
---|
772 | buffer_fill_and_print();
|
---|
773 | }
|
---|
774 |
|
---|
775 | static void open_file_and_read_lines(void)
|
---|
776 | {
|
---|
777 | if (filename) {
|
---|
778 | xmove_fd(xopen(filename, O_RDONLY), STDIN_FILENO);
|
---|
779 | } else {
|
---|
780 | /* "less" with no arguments in argv[] */
|
---|
781 | /* For status line only */
|
---|
782 | filename = xstrdup(bb_msg_standard_input);
|
---|
783 | }
|
---|
784 | readpos = 0;
|
---|
785 | readeof = 0;
|
---|
786 | last_line_pos = 0;
|
---|
787 | terminated = 1;
|
---|
788 | read_lines();
|
---|
789 | }
|
---|
790 |
|
---|
791 | /* Reinitialize everything for a new file - free the memory and start over */
|
---|
792 | static void reinitialize(void)
|
---|
793 | {
|
---|
794 | unsigned i;
|
---|
795 |
|
---|
796 | if (flines) {
|
---|
797 | for (i = 0; i <= max_fline; i++)
|
---|
798 | free(MEMPTR(flines[i]));
|
---|
799 | free(flines);
|
---|
800 | flines = NULL;
|
---|
801 | }
|
---|
802 |
|
---|
803 | max_fline = -1;
|
---|
804 | cur_fline = 0;
|
---|
805 | max_lineno = 0;
|
---|
806 | open_file_and_read_lines();
|
---|
807 | buffer_fill_and_print();
|
---|
808 | }
|
---|
809 |
|
---|
810 | static int getch_nowait(void)
|
---|
811 | {
|
---|
812 | int rd;
|
---|
813 | struct pollfd pfd[2];
|
---|
814 |
|
---|
815 | pfd[0].fd = STDIN_FILENO;
|
---|
816 | pfd[0].events = POLLIN;
|
---|
817 | pfd[1].fd = kbd_fd;
|
---|
818 | pfd[1].events = POLLIN;
|
---|
819 | again:
|
---|
820 | tcsetattr(kbd_fd, TCSANOW, &term_less);
|
---|
821 | /* NB: select/poll returns whenever read will not block. Therefore:
|
---|
822 | * if eof is reached, select/poll will return immediately
|
---|
823 | * because read will immediately return 0 bytes.
|
---|
824 | * Even if select/poll says that input is available, read CAN block
|
---|
825 | * (switch fd into O_NONBLOCK'ed mode to avoid it)
|
---|
826 | */
|
---|
827 | rd = 1;
|
---|
828 | /* Are we interested in stdin? */
|
---|
829 | //TODO: reuse code for determining this
|
---|
830 | if (!(option_mask32 & FLAG_S)
|
---|
831 | ? !(max_fline > cur_fline + max_displayed_line)
|
---|
832 | : !(max_fline >= cur_fline
|
---|
833 | && max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
|
---|
834 | ) {
|
---|
835 | if (eof_error > 0) /* did NOT reach eof yet */
|
---|
836 | rd = 0; /* yes, we are interested in stdin */
|
---|
837 | }
|
---|
838 | /* Position cursor if line input is done */
|
---|
839 | if (less_gets_pos >= 0)
|
---|
840 | move_cursor(max_displayed_line + 2, less_gets_pos + 1);
|
---|
841 | fflush_all();
|
---|
842 |
|
---|
843 | if (kbd_input[0] == 0) { /* if nothing is buffered */
|
---|
844 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
845 | while (1) {
|
---|
846 | int r;
|
---|
847 | /* NB: SIGWINCH interrupts poll() */
|
---|
848 | r = poll(pfd + rd, 2 - rd, -1);
|
---|
849 | if (/*r < 0 && errno == EINTR &&*/ winch_counter)
|
---|
850 | return '\\'; /* anything which has no defined function */
|
---|
851 | if (r) break;
|
---|
852 | }
|
---|
853 | #else
|
---|
854 | safe_poll(pfd + rd, 2 - rd, -1);
|
---|
855 | #endif
|
---|
856 | }
|
---|
857 |
|
---|
858 | /* We have kbd_fd in O_NONBLOCK mode, read inside read_key()
|
---|
859 | * would not block even if there is no input available */
|
---|
860 | rd = read_key(kbd_fd, kbd_input, /*timeout off:*/ -2);
|
---|
861 | if (rd == -1) {
|
---|
862 | if (errno == EAGAIN) {
|
---|
863 | /* No keyboard input available. Since poll() did return,
|
---|
864 | * we should have input on stdin */
|
---|
865 | read_lines();
|
---|
866 | buffer_fill_and_print();
|
---|
867 | goto again;
|
---|
868 | }
|
---|
869 | /* EOF/error (ssh session got killed etc) */
|
---|
870 | less_exit(0);
|
---|
871 | }
|
---|
872 | set_tty_cooked();
|
---|
873 | return rd;
|
---|
874 | }
|
---|
875 |
|
---|
876 | /* Grab a character from input without requiring the return key.
|
---|
877 | * May return KEYCODE_xxx values.
|
---|
878 | * Note that this function works best with raw input. */
|
---|
879 | static int less_getch(int pos)
|
---|
880 | {
|
---|
881 | int i;
|
---|
882 |
|
---|
883 | again:
|
---|
884 | less_gets_pos = pos;
|
---|
885 | i = getch_nowait();
|
---|
886 | less_gets_pos = -1;
|
---|
887 |
|
---|
888 | /* Discard Ctrl-something chars */
|
---|
889 | if (i >= 0 && i < ' ' && i != 0x0d && i != 8)
|
---|
890 | goto again;
|
---|
891 | return i;
|
---|
892 | }
|
---|
893 |
|
---|
894 | static char* less_gets(int sz)
|
---|
895 | {
|
---|
896 | int c;
|
---|
897 | unsigned i = 0;
|
---|
898 | char *result = xzalloc(1);
|
---|
899 |
|
---|
900 | while (1) {
|
---|
901 | c = '\0';
|
---|
902 | less_gets_pos = sz + i;
|
---|
903 | c = getch_nowait();
|
---|
904 | if (c == 0x0d) {
|
---|
905 | result[i] = '\0';
|
---|
906 | less_gets_pos = -1;
|
---|
907 | return result;
|
---|
908 | }
|
---|
909 | if (c == 0x7f)
|
---|
910 | c = 8;
|
---|
911 | if (c == 8 && i) {
|
---|
912 | printf("\x8 \x8");
|
---|
913 | i--;
|
---|
914 | }
|
---|
915 | if (c < ' ') /* filters out KEYCODE_xxx too (<0) */
|
---|
916 | continue;
|
---|
917 | if (i >= width - sz - 1)
|
---|
918 | continue; /* len limit */
|
---|
919 | bb_putchar(c);
|
---|
920 | result[i++] = c;
|
---|
921 | result = xrealloc(result, i+1);
|
---|
922 | }
|
---|
923 | }
|
---|
924 |
|
---|
925 | static void examine_file(void)
|
---|
926 | {
|
---|
927 | char *new_fname;
|
---|
928 |
|
---|
929 | print_statusline("Examine: ");
|
---|
930 | new_fname = less_gets(sizeof("Examine: ") - 1);
|
---|
931 | if (!new_fname[0]) {
|
---|
932 | status_print();
|
---|
933 | err:
|
---|
934 | free(new_fname);
|
---|
935 | return;
|
---|
936 | }
|
---|
937 | if (access(new_fname, R_OK) != 0) {
|
---|
938 | print_statusline("Cannot read this file");
|
---|
939 | goto err;
|
---|
940 | }
|
---|
941 | free(filename);
|
---|
942 | filename = new_fname;
|
---|
943 | /* files start by = argv. why we assume that argv is infinitely long??
|
---|
944 | files[num_files] = filename;
|
---|
945 | current_file = num_files + 1;
|
---|
946 | num_files++; */
|
---|
947 | files[0] = filename;
|
---|
948 | num_files = current_file = 1;
|
---|
949 | reinitialize();
|
---|
950 | }
|
---|
951 |
|
---|
952 | /* This function changes the file currently being paged. direction can be one of the following:
|
---|
953 | * -1: go back one file
|
---|
954 | * 0: go to the first file
|
---|
955 | * 1: go forward one file */
|
---|
956 | static void change_file(int direction)
|
---|
957 | {
|
---|
958 | if (current_file != ((direction > 0) ? num_files : 1)) {
|
---|
959 | current_file = direction ? current_file + direction : 1;
|
---|
960 | free(filename);
|
---|
961 | filename = xstrdup(files[current_file - 1]);
|
---|
962 | reinitialize();
|
---|
963 | } else {
|
---|
964 | print_statusline(direction > 0 ? "No next file" : "No previous file");
|
---|
965 | }
|
---|
966 | }
|
---|
967 |
|
---|
968 | static void remove_current_file(void)
|
---|
969 | {
|
---|
970 | unsigned i;
|
---|
971 |
|
---|
972 | if (num_files < 2)
|
---|
973 | return;
|
---|
974 |
|
---|
975 | if (current_file != 1) {
|
---|
976 | change_file(-1);
|
---|
977 | for (i = 3; i <= num_files; i++)
|
---|
978 | files[i - 2] = files[i - 1];
|
---|
979 | num_files--;
|
---|
980 | } else {
|
---|
981 | change_file(1);
|
---|
982 | for (i = 2; i <= num_files; i++)
|
---|
983 | files[i - 2] = files[i - 1];
|
---|
984 | num_files--;
|
---|
985 | current_file--;
|
---|
986 | }
|
---|
987 | }
|
---|
988 |
|
---|
989 | static void colon_process(void)
|
---|
990 | {
|
---|
991 | int keypress;
|
---|
992 |
|
---|
993 | /* Clear the current line and print a prompt */
|
---|
994 | print_statusline(" :");
|
---|
995 |
|
---|
996 | keypress = less_getch(2);
|
---|
997 | switch (keypress) {
|
---|
998 | case 'd':
|
---|
999 | remove_current_file();
|
---|
1000 | break;
|
---|
1001 | case 'e':
|
---|
1002 | examine_file();
|
---|
1003 | break;
|
---|
1004 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
1005 | case 'f':
|
---|
1006 | m_status_print();
|
---|
1007 | break;
|
---|
1008 | #endif
|
---|
1009 | case 'n':
|
---|
1010 | change_file(1);
|
---|
1011 | break;
|
---|
1012 | case 'p':
|
---|
1013 | change_file(-1);
|
---|
1014 | break;
|
---|
1015 | case 'q':
|
---|
1016 | less_exit(EXIT_SUCCESS);
|
---|
1017 | break;
|
---|
1018 | case 'x':
|
---|
1019 | change_file(0);
|
---|
1020 | break;
|
---|
1021 | }
|
---|
1022 | }
|
---|
1023 |
|
---|
1024 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
1025 | static void normalize_match_pos(int match)
|
---|
1026 | {
|
---|
1027 | if (match >= num_matches)
|
---|
1028 | match = num_matches - 1;
|
---|
1029 | if (match < 0)
|
---|
1030 | match = 0;
|
---|
1031 | match_pos = match;
|
---|
1032 | }
|
---|
1033 |
|
---|
1034 | static void goto_match(int match)
|
---|
1035 | {
|
---|
1036 | if (!pattern_valid)
|
---|
1037 | return;
|
---|
1038 | if (match < 0)
|
---|
1039 | match = 0;
|
---|
1040 | /* Try to find next match if eof isn't reached yet */
|
---|
1041 | if (match >= num_matches && eof_error > 0) {
|
---|
1042 | wanted_match = match; /* "I want to read until I see N'th match" */
|
---|
1043 | read_lines();
|
---|
1044 | }
|
---|
1045 | if (num_matches) {
|
---|
1046 | normalize_match_pos(match);
|
---|
1047 | buffer_line(match_lines[match_pos]);
|
---|
1048 | } else {
|
---|
1049 | print_statusline("No matches found");
|
---|
1050 | }
|
---|
1051 | }
|
---|
1052 |
|
---|
1053 | static void fill_match_lines(unsigned pos)
|
---|
1054 | {
|
---|
1055 | if (!pattern_valid)
|
---|
1056 | return;
|
---|
1057 | /* Run the regex on each line of the current file */
|
---|
1058 | while (pos <= max_fline) {
|
---|
1059 | /* If this line matches */
|
---|
1060 | if (regexec(&pattern, flines[pos], 0, NULL, 0) == 0
|
---|
1061 | /* and we didn't match it last time */
|
---|
1062 | && !(num_matches && match_lines[num_matches-1] == pos)
|
---|
1063 | ) {
|
---|
1064 | match_lines = xrealloc_vector(match_lines, 4, num_matches);
|
---|
1065 | match_lines[num_matches++] = pos;
|
---|
1066 | }
|
---|
1067 | pos++;
|
---|
1068 | }
|
---|
1069 | }
|
---|
1070 |
|
---|
1071 | static void regex_process(void)
|
---|
1072 | {
|
---|
1073 | char *uncomp_regex, *err;
|
---|
1074 |
|
---|
1075 | /* Reset variables */
|
---|
1076 | free(match_lines);
|
---|
1077 | match_lines = NULL;
|
---|
1078 | match_pos = 0;
|
---|
1079 | num_matches = 0;
|
---|
1080 | if (pattern_valid) {
|
---|
1081 | regfree(&pattern);
|
---|
1082 | pattern_valid = 0;
|
---|
1083 | }
|
---|
1084 |
|
---|
1085 | /* Get the uncompiled regular expression from the user */
|
---|
1086 | clear_line();
|
---|
1087 | bb_putchar((option_mask32 & LESS_STATE_MATCH_BACKWARDS) ? '?' : '/');
|
---|
1088 | uncomp_regex = less_gets(1);
|
---|
1089 | if (!uncomp_regex[0]) {
|
---|
1090 | free(uncomp_regex);
|
---|
1091 | buffer_print();
|
---|
1092 | return;
|
---|
1093 | }
|
---|
1094 |
|
---|
1095 | /* Compile the regex and check for errors */
|
---|
1096 | err = regcomp_or_errmsg(&pattern, uncomp_regex,
|
---|
1097 | (option_mask32 & FLAG_I) ? REG_ICASE : 0);
|
---|
1098 | free(uncomp_regex);
|
---|
1099 | if (err) {
|
---|
1100 | print_statusline(err);
|
---|
1101 | free(err);
|
---|
1102 | return;
|
---|
1103 | }
|
---|
1104 |
|
---|
1105 | pattern_valid = 1;
|
---|
1106 | match_pos = 0;
|
---|
1107 | fill_match_lines(0);
|
---|
1108 | while (match_pos < num_matches) {
|
---|
1109 | if ((int)match_lines[match_pos] > cur_fline)
|
---|
1110 | break;
|
---|
1111 | match_pos++;
|
---|
1112 | }
|
---|
1113 | if (option_mask32 & LESS_STATE_MATCH_BACKWARDS)
|
---|
1114 | match_pos--;
|
---|
1115 |
|
---|
1116 | /* It's possible that no matches are found yet.
|
---|
1117 | * goto_match() will read input looking for match,
|
---|
1118 | * if needed */
|
---|
1119 | goto_match(match_pos);
|
---|
1120 | }
|
---|
1121 | #endif
|
---|
1122 |
|
---|
1123 | static void number_process(int first_digit)
|
---|
1124 | {
|
---|
1125 | unsigned i;
|
---|
1126 | int num;
|
---|
1127 | int keypress;
|
---|
1128 | char num_input[sizeof(int)*4]; /* more than enough */
|
---|
1129 |
|
---|
1130 | num_input[0] = first_digit;
|
---|
1131 |
|
---|
1132 | /* Clear the current line, print a prompt, and then print the digit */
|
---|
1133 | clear_line();
|
---|
1134 | printf(":%c", first_digit);
|
---|
1135 |
|
---|
1136 | /* Receive input until a letter is given */
|
---|
1137 | i = 1;
|
---|
1138 | while (i < sizeof(num_input)-1) {
|
---|
1139 | keypress = less_getch(i + 1);
|
---|
1140 | if ((unsigned)keypress > 255 || !isdigit(num_input[i]))
|
---|
1141 | break;
|
---|
1142 | num_input[i] = keypress;
|
---|
1143 | bb_putchar(keypress);
|
---|
1144 | i++;
|
---|
1145 | }
|
---|
1146 |
|
---|
1147 | num_input[i] = '\0';
|
---|
1148 | num = bb_strtou(num_input, NULL, 10);
|
---|
1149 | /* on format error, num == -1 */
|
---|
1150 | if (num < 1 || num > MAXLINES) {
|
---|
1151 | buffer_print();
|
---|
1152 | return;
|
---|
1153 | }
|
---|
1154 |
|
---|
1155 | /* We now know the number and the letter entered, so we process them */
|
---|
1156 | switch (keypress) {
|
---|
1157 | case KEYCODE_DOWN: case 'z': case 'd': case 'e': case ' ': case '\015':
|
---|
1158 | buffer_down(num);
|
---|
1159 | break;
|
---|
1160 | case KEYCODE_UP: case 'b': case 'w': case 'y': case 'u':
|
---|
1161 | buffer_up(num);
|
---|
1162 | break;
|
---|
1163 | case 'g': case '<': case 'G': case '>':
|
---|
1164 | cur_fline = num + max_displayed_line;
|
---|
1165 | read_lines();
|
---|
1166 | buffer_line(num - 1);
|
---|
1167 | break;
|
---|
1168 | case 'p': case '%':
|
---|
1169 | num = num * (max_fline / 100); /* + max_fline / 2; */
|
---|
1170 | cur_fline = num + max_displayed_line;
|
---|
1171 | read_lines();
|
---|
1172 | buffer_line(num);
|
---|
1173 | break;
|
---|
1174 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
1175 | case 'n':
|
---|
1176 | goto_match(match_pos + num);
|
---|
1177 | break;
|
---|
1178 | case '/':
|
---|
1179 | option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
---|
1180 | regex_process();
|
---|
1181 | break;
|
---|
1182 | case '?':
|
---|
1183 | option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
---|
1184 | regex_process();
|
---|
1185 | break;
|
---|
1186 | #endif
|
---|
1187 | }
|
---|
1188 | }
|
---|
1189 |
|
---|
1190 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
1191 | static void flag_change(void)
|
---|
1192 | {
|
---|
1193 | int keypress;
|
---|
1194 |
|
---|
1195 | clear_line();
|
---|
1196 | bb_putchar('-');
|
---|
1197 | keypress = less_getch(1);
|
---|
1198 |
|
---|
1199 | switch (keypress) {
|
---|
1200 | case 'M':
|
---|
1201 | option_mask32 ^= FLAG_M;
|
---|
1202 | break;
|
---|
1203 | case 'm':
|
---|
1204 | option_mask32 ^= FLAG_m;
|
---|
1205 | break;
|
---|
1206 | case 'E':
|
---|
1207 | option_mask32 ^= FLAG_E;
|
---|
1208 | break;
|
---|
1209 | case '~':
|
---|
1210 | option_mask32 ^= FLAG_TILDE;
|
---|
1211 | break;
|
---|
1212 | case 'S':
|
---|
1213 | option_mask32 ^= FLAG_S;
|
---|
1214 | buffer_fill_and_print();
|
---|
1215 | break;
|
---|
1216 | #if ENABLE_FEATURE_LESS_LINENUMS
|
---|
1217 | case 'N':
|
---|
1218 | option_mask32 ^= FLAG_N;
|
---|
1219 | re_wrap();
|
---|
1220 | buffer_fill_and_print();
|
---|
1221 | break;
|
---|
1222 | #endif
|
---|
1223 | }
|
---|
1224 | }
|
---|
1225 |
|
---|
1226 | #ifdef BLOAT
|
---|
1227 | static void show_flag_status(void)
|
---|
1228 | {
|
---|
1229 | int keypress;
|
---|
1230 | int flag_val;
|
---|
1231 |
|
---|
1232 | clear_line();
|
---|
1233 | bb_putchar('_');
|
---|
1234 | keypress = less_getch(1);
|
---|
1235 |
|
---|
1236 | switch (keypress) {
|
---|
1237 | case 'M':
|
---|
1238 | flag_val = option_mask32 & FLAG_M;
|
---|
1239 | break;
|
---|
1240 | case 'm':
|
---|
1241 | flag_val = option_mask32 & FLAG_m;
|
---|
1242 | break;
|
---|
1243 | case '~':
|
---|
1244 | flag_val = option_mask32 & FLAG_TILDE;
|
---|
1245 | break;
|
---|
1246 | case 'N':
|
---|
1247 | flag_val = option_mask32 & FLAG_N;
|
---|
1248 | break;
|
---|
1249 | case 'E':
|
---|
1250 | flag_val = option_mask32 & FLAG_E;
|
---|
1251 | break;
|
---|
1252 | default:
|
---|
1253 | flag_val = 0;
|
---|
1254 | break;
|
---|
1255 | }
|
---|
1256 |
|
---|
1257 | clear_line();
|
---|
1258 | printf(HIGHLIGHT"The status of the flag is: %u"NORMAL, flag_val != 0);
|
---|
1259 | }
|
---|
1260 | #endif
|
---|
1261 |
|
---|
1262 | #endif /* ENABLE_FEATURE_LESS_DASHCMD */
|
---|
1263 |
|
---|
1264 | static void save_input_to_file(void)
|
---|
1265 | {
|
---|
1266 | const char *msg = "";
|
---|
1267 | char *current_line;
|
---|
1268 | unsigned i;
|
---|
1269 | FILE *fp;
|
---|
1270 |
|
---|
1271 | print_statusline("Log file: ");
|
---|
1272 | current_line = less_gets(sizeof("Log file: ")-1);
|
---|
1273 | if (current_line[0]) {
|
---|
1274 | fp = fopen_for_write(current_line);
|
---|
1275 | if (!fp) {
|
---|
1276 | msg = "Error opening log file";
|
---|
1277 | goto ret;
|
---|
1278 | }
|
---|
1279 | for (i = 0; i <= max_fline; i++)
|
---|
1280 | fprintf(fp, "%s\n", flines[i]);
|
---|
1281 | fclose(fp);
|
---|
1282 | msg = "Done";
|
---|
1283 | }
|
---|
1284 | ret:
|
---|
1285 | print_statusline(msg);
|
---|
1286 | free(current_line);
|
---|
1287 | }
|
---|
1288 |
|
---|
1289 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
1290 | static void add_mark(void)
|
---|
1291 | {
|
---|
1292 | int letter;
|
---|
1293 |
|
---|
1294 | print_statusline("Mark: ");
|
---|
1295 | letter = less_getch(sizeof("Mark: ") - 1);
|
---|
1296 |
|
---|
1297 | if (isalpha(letter)) {
|
---|
1298 | /* If we exceed 15 marks, start overwriting previous ones */
|
---|
1299 | if (num_marks == 14)
|
---|
1300 | num_marks = 0;
|
---|
1301 |
|
---|
1302 | mark_lines[num_marks][0] = letter;
|
---|
1303 | mark_lines[num_marks][1] = cur_fline;
|
---|
1304 | num_marks++;
|
---|
1305 | } else {
|
---|
1306 | print_statusline("Invalid mark letter");
|
---|
1307 | }
|
---|
1308 | }
|
---|
1309 |
|
---|
1310 | static void goto_mark(void)
|
---|
1311 | {
|
---|
1312 | int letter;
|
---|
1313 | int i;
|
---|
1314 |
|
---|
1315 | print_statusline("Go to mark: ");
|
---|
1316 | letter = less_getch(sizeof("Go to mark: ") - 1);
|
---|
1317 | clear_line();
|
---|
1318 |
|
---|
1319 | if (isalpha(letter)) {
|
---|
1320 | for (i = 0; i <= num_marks; i++)
|
---|
1321 | if (letter == mark_lines[i][0]) {
|
---|
1322 | buffer_line(mark_lines[i][1]);
|
---|
1323 | break;
|
---|
1324 | }
|
---|
1325 | if (num_marks == 14 && letter != mark_lines[14][0])
|
---|
1326 | print_statusline("Mark not set");
|
---|
1327 | } else
|
---|
1328 | print_statusline("Invalid mark letter");
|
---|
1329 | }
|
---|
1330 | #endif
|
---|
1331 |
|
---|
1332 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
1333 | static char opp_bracket(char bracket)
|
---|
1334 | {
|
---|
1335 | switch (bracket) {
|
---|
1336 | case '{': case '[': /* '}' == '{' + 2. Same for '[' */
|
---|
1337 | bracket++;
|
---|
1338 | case '(': /* ')' == '(' + 1 */
|
---|
1339 | bracket++;
|
---|
1340 | break;
|
---|
1341 | case '}': case ']':
|
---|
1342 | bracket--;
|
---|
1343 | case ')':
|
---|
1344 | bracket--;
|
---|
1345 | break;
|
---|
1346 | };
|
---|
1347 | return bracket;
|
---|
1348 | }
|
---|
1349 |
|
---|
1350 | static void match_right_bracket(char bracket)
|
---|
1351 | {
|
---|
1352 | unsigned i;
|
---|
1353 |
|
---|
1354 | if (strchr(flines[cur_fline], bracket) == NULL) {
|
---|
1355 | print_statusline("No bracket in top line");
|
---|
1356 | return;
|
---|
1357 | }
|
---|
1358 | bracket = opp_bracket(bracket);
|
---|
1359 | for (i = cur_fline + 1; i < max_fline; i++) {
|
---|
1360 | if (strchr(flines[i], bracket) != NULL) {
|
---|
1361 | buffer_line(i);
|
---|
1362 | return;
|
---|
1363 | }
|
---|
1364 | }
|
---|
1365 | print_statusline("No matching bracket found");
|
---|
1366 | }
|
---|
1367 |
|
---|
1368 | static void match_left_bracket(char bracket)
|
---|
1369 | {
|
---|
1370 | int i;
|
---|
1371 |
|
---|
1372 | if (strchr(flines[cur_fline + max_displayed_line], bracket) == NULL) {
|
---|
1373 | print_statusline("No bracket in bottom line");
|
---|
1374 | return;
|
---|
1375 | }
|
---|
1376 |
|
---|
1377 | bracket = opp_bracket(bracket);
|
---|
1378 | for (i = cur_fline + max_displayed_line; i >= 0; i--) {
|
---|
1379 | if (strchr(flines[i], bracket) != NULL) {
|
---|
1380 | buffer_line(i);
|
---|
1381 | return;
|
---|
1382 | }
|
---|
1383 | }
|
---|
1384 | print_statusline("No matching bracket found");
|
---|
1385 | }
|
---|
1386 | #endif /* FEATURE_LESS_BRACKETS */
|
---|
1387 |
|
---|
1388 | static void keypress_process(int keypress)
|
---|
1389 | {
|
---|
1390 | switch (keypress) {
|
---|
1391 | case KEYCODE_DOWN: case 'e': case 'j': case 0x0d:
|
---|
1392 | buffer_down(1);
|
---|
1393 | break;
|
---|
1394 | case KEYCODE_UP: case 'y': case 'k':
|
---|
1395 | buffer_up(1);
|
---|
1396 | break;
|
---|
1397 | case KEYCODE_PAGEDOWN: case ' ': case 'z': case 'f':
|
---|
1398 | buffer_down(max_displayed_line + 1);
|
---|
1399 | break;
|
---|
1400 | case KEYCODE_PAGEUP: case 'w': case 'b':
|
---|
1401 | buffer_up(max_displayed_line + 1);
|
---|
1402 | break;
|
---|
1403 | case 'd':
|
---|
1404 | buffer_down((max_displayed_line + 1) / 2);
|
---|
1405 | break;
|
---|
1406 | case 'u':
|
---|
1407 | buffer_up((max_displayed_line + 1) / 2);
|
---|
1408 | break;
|
---|
1409 | case KEYCODE_HOME: case 'g': case 'p': case '<': case '%':
|
---|
1410 | buffer_line(0);
|
---|
1411 | break;
|
---|
1412 | case KEYCODE_END: case 'G': case '>':
|
---|
1413 | cur_fline = MAXLINES;
|
---|
1414 | read_lines();
|
---|
1415 | buffer_line(cur_fline);
|
---|
1416 | break;
|
---|
1417 | case 'q': case 'Q':
|
---|
1418 | less_exit(EXIT_SUCCESS);
|
---|
1419 | break;
|
---|
1420 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
1421 | case 'm':
|
---|
1422 | add_mark();
|
---|
1423 | buffer_print();
|
---|
1424 | break;
|
---|
1425 | case '\'':
|
---|
1426 | goto_mark();
|
---|
1427 | buffer_print();
|
---|
1428 | break;
|
---|
1429 | #endif
|
---|
1430 | case 'r': case 'R':
|
---|
1431 | buffer_print();
|
---|
1432 | break;
|
---|
1433 | /*case 'R':
|
---|
1434 | full_repaint();
|
---|
1435 | break;*/
|
---|
1436 | case 's':
|
---|
1437 | save_input_to_file();
|
---|
1438 | break;
|
---|
1439 | case 'E':
|
---|
1440 | examine_file();
|
---|
1441 | break;
|
---|
1442 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
1443 | case '=':
|
---|
1444 | m_status_print();
|
---|
1445 | break;
|
---|
1446 | #endif
|
---|
1447 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
1448 | case '/':
|
---|
1449 | option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
---|
1450 | regex_process();
|
---|
1451 | break;
|
---|
1452 | case 'n':
|
---|
1453 | goto_match(match_pos + 1);
|
---|
1454 | break;
|
---|
1455 | case 'N':
|
---|
1456 | goto_match(match_pos - 1);
|
---|
1457 | break;
|
---|
1458 | case '?':
|
---|
1459 | option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
---|
1460 | regex_process();
|
---|
1461 | break;
|
---|
1462 | #endif
|
---|
1463 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
1464 | case '-':
|
---|
1465 | flag_change();
|
---|
1466 | buffer_print();
|
---|
1467 | break;
|
---|
1468 | #ifdef BLOAT
|
---|
1469 | case '_':
|
---|
1470 | show_flag_status();
|
---|
1471 | break;
|
---|
1472 | #endif
|
---|
1473 | #endif
|
---|
1474 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
1475 | case '{': case '(': case '[':
|
---|
1476 | match_right_bracket(keypress);
|
---|
1477 | break;
|
---|
1478 | case '}': case ')': case ']':
|
---|
1479 | match_left_bracket(keypress);
|
---|
1480 | break;
|
---|
1481 | #endif
|
---|
1482 | case ':':
|
---|
1483 | colon_process();
|
---|
1484 | break;
|
---|
1485 | }
|
---|
1486 |
|
---|
1487 | if (isdigit(keypress))
|
---|
1488 | number_process(keypress);
|
---|
1489 | }
|
---|
1490 |
|
---|
1491 | static void sig_catcher(int sig)
|
---|
1492 | {
|
---|
1493 | less_exit(- sig);
|
---|
1494 | }
|
---|
1495 |
|
---|
1496 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
1497 | static void sigwinch_handler(int sig UNUSED_PARAM)
|
---|
1498 | {
|
---|
1499 | winch_counter++;
|
---|
1500 | }
|
---|
1501 | #endif
|
---|
1502 |
|
---|
1503 | int less_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
1504 | int less_main(int argc, char **argv)
|
---|
1505 | {
|
---|
1506 | int keypress;
|
---|
1507 |
|
---|
1508 | INIT_G();
|
---|
1509 |
|
---|
1510 | /* TODO: -x: do not interpret backspace, -xx: tab also */
|
---|
1511 | /* -xxx: newline also */
|
---|
1512 | /* -w N: assume width N (-xxx -w 32: hex viewer of sorts) */
|
---|
1513 | getopt32(argv, "EMmN~I" IF_FEATURE_LESS_DASHCMD("S"));
|
---|
1514 | argc -= optind;
|
---|
1515 | argv += optind;
|
---|
1516 | num_files = argc;
|
---|
1517 | files = argv;
|
---|
1518 |
|
---|
1519 | /* Another popular pager, most, detects when stdout
|
---|
1520 | * is not a tty and turns into cat. This makes sense. */
|
---|
1521 | if (!isatty(STDOUT_FILENO))
|
---|
1522 | return bb_cat(argv);
|
---|
1523 |
|
---|
1524 | if (!num_files) {
|
---|
1525 | if (isatty(STDIN_FILENO)) {
|
---|
1526 | /* Just "less"? No args and no redirection? */
|
---|
1527 | bb_error_msg("missing filename");
|
---|
1528 | bb_show_usage();
|
---|
1529 | }
|
---|
1530 | } else {
|
---|
1531 | filename = xstrdup(files[0]);
|
---|
1532 | }
|
---|
1533 |
|
---|
1534 | if (option_mask32 & FLAG_TILDE)
|
---|
1535 | empty_line_marker = "";
|
---|
1536 |
|
---|
1537 | kbd_fd = open(CURRENT_TTY, O_RDONLY);
|
---|
1538 | if (kbd_fd < 0)
|
---|
1539 | return bb_cat(argv);
|
---|
1540 | ndelay_on(kbd_fd);
|
---|
1541 |
|
---|
1542 | tcgetattr(kbd_fd, &term_orig);
|
---|
1543 | term_less = term_orig;
|
---|
1544 | term_less.c_lflag &= ~(ICANON | ECHO);
|
---|
1545 | term_less.c_iflag &= ~(IXON | ICRNL);
|
---|
1546 | /*term_less.c_oflag &= ~ONLCR;*/
|
---|
1547 | term_less.c_cc[VMIN] = 1;
|
---|
1548 | term_less.c_cc[VTIME] = 0;
|
---|
1549 |
|
---|
1550 | get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
1551 | /* 20: two tabstops + 4 */
|
---|
1552 | if (width < 20 || max_displayed_line < 3)
|
---|
1553 | return bb_cat(argv);
|
---|
1554 | max_displayed_line -= 2;
|
---|
1555 |
|
---|
1556 | /* We want to restore term_orig on exit */
|
---|
1557 | bb_signals(BB_FATAL_SIGS, sig_catcher);
|
---|
1558 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
1559 | signal(SIGWINCH, sigwinch_handler);
|
---|
1560 | #endif
|
---|
1561 |
|
---|
1562 | buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
---|
1563 | reinitialize();
|
---|
1564 | while (1) {
|
---|
1565 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
1566 | while (WINCH_COUNTER) {
|
---|
1567 | again:
|
---|
1568 | winch_counter--;
|
---|
1569 | get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
1570 | /* 20: two tabstops + 4 */
|
---|
1571 | if (width < 20)
|
---|
1572 | width = 20;
|
---|
1573 | if (max_displayed_line < 3)
|
---|
1574 | max_displayed_line = 3;
|
---|
1575 | max_displayed_line -= 2;
|
---|
1576 | free(buffer);
|
---|
1577 | buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
---|
1578 | /* Avoid re-wrap and/or redraw if we already know
|
---|
1579 | * we need to do it again. These ops are expensive */
|
---|
1580 | if (WINCH_COUNTER)
|
---|
1581 | goto again;
|
---|
1582 | re_wrap();
|
---|
1583 | if (WINCH_COUNTER)
|
---|
1584 | goto again;
|
---|
1585 | buffer_fill_and_print();
|
---|
1586 | /* This took some time. Loop back and check,
|
---|
1587 | * were there another SIGWINCH? */
|
---|
1588 | }
|
---|
1589 | #endif
|
---|
1590 | keypress = less_getch(-1); /* -1: do not position cursor */
|
---|
1591 | keypress_process(keypress);
|
---|
1592 | }
|
---|
1593 | }
|
---|
1594 |
|
---|
1595 | /*
|
---|
1596 | Help text of less version 418 is below.
|
---|
1597 | If you are implementing something, keeping
|
---|
1598 | key and/or command line switch compatibility is a good idea:
|
---|
1599 |
|
---|
1600 |
|
---|
1601 | SUMMARY OF LESS COMMANDS
|
---|
1602 |
|
---|
1603 | Commands marked with * may be preceded by a number, N.
|
---|
1604 | Notes in parentheses indicate the behavior if N is given.
|
---|
1605 | h H Display this help.
|
---|
1606 | q :q Q :Q ZZ Exit.
|
---|
1607 | ---------------------------------------------------------------------------
|
---|
1608 | MOVING
|
---|
1609 | e ^E j ^N CR * Forward one line (or N lines).
|
---|
1610 | y ^Y k ^K ^P * Backward one line (or N lines).
|
---|
1611 | f ^F ^V SPACE * Forward one window (or N lines).
|
---|
1612 | b ^B ESC-v * Backward one window (or N lines).
|
---|
1613 | z * Forward one window (and set window to N).
|
---|
1614 | w * Backward one window (and set window to N).
|
---|
1615 | ESC-SPACE * Forward one window, but don't stop at end-of-file.
|
---|
1616 | d ^D * Forward one half-window (and set half-window to N).
|
---|
1617 | u ^U * Backward one half-window (and set half-window to N).
|
---|
1618 | ESC-) RightArrow * Left one half screen width (or N positions).
|
---|
1619 | ESC-( LeftArrow * Right one half screen width (or N positions).
|
---|
1620 | F Forward forever; like "tail -f".
|
---|
1621 | r ^R ^L Repaint screen.
|
---|
1622 | R Repaint screen, discarding buffered input.
|
---|
1623 | ---------------------------------------------------
|
---|
1624 | Default "window" is the screen height.
|
---|
1625 | Default "half-window" is half of the screen height.
|
---|
1626 | ---------------------------------------------------------------------------
|
---|
1627 | SEARCHING
|
---|
1628 | /pattern * Search forward for (N-th) matching line.
|
---|
1629 | ?pattern * Search backward for (N-th) matching line.
|
---|
1630 | n * Repeat previous search (for N-th occurrence).
|
---|
1631 | N * Repeat previous search in reverse direction.
|
---|
1632 | ESC-n * Repeat previous search, spanning files.
|
---|
1633 | ESC-N * Repeat previous search, reverse dir. & spanning files.
|
---|
1634 | ESC-u Undo (toggle) search highlighting.
|
---|
1635 | ---------------------------------------------------
|
---|
1636 | Search patterns may be modified by one or more of:
|
---|
1637 | ^N or ! Search for NON-matching lines.
|
---|
1638 | ^E or * Search multiple files (pass thru END OF FILE).
|
---|
1639 | ^F or @ Start search at FIRST file (for /) or last file (for ?).
|
---|
1640 | ^K Highlight matches, but don't move (KEEP position).
|
---|
1641 | ^R Don't use REGULAR EXPRESSIONS.
|
---|
1642 | ---------------------------------------------------------------------------
|
---|
1643 | JUMPING
|
---|
1644 | g < ESC-< * Go to first line in file (or line N).
|
---|
1645 | G > ESC-> * Go to last line in file (or line N).
|
---|
1646 | p % * Go to beginning of file (or N percent into file).
|
---|
1647 | t * Go to the (N-th) next tag.
|
---|
1648 | T * Go to the (N-th) previous tag.
|
---|
1649 | { ( [ * Find close bracket } ) ].
|
---|
1650 | } ) ] * Find open bracket { ( [.
|
---|
1651 | ESC-^F <c1> <c2> * Find close bracket <c2>.
|
---|
1652 | ESC-^B <c1> <c2> * Find open bracket <c1>
|
---|
1653 | ---------------------------------------------------
|
---|
1654 | Each "find close bracket" command goes forward to the close bracket
|
---|
1655 | matching the (N-th) open bracket in the top line.
|
---|
1656 | Each "find open bracket" command goes backward to the open bracket
|
---|
1657 | matching the (N-th) close bracket in the bottom line.
|
---|
1658 | m<letter> Mark the current position with <letter>.
|
---|
1659 | '<letter> Go to a previously marked position.
|
---|
1660 | '' Go to the previous position.
|
---|
1661 | ^X^X Same as '.
|
---|
1662 | ---------------------------------------------------
|
---|
1663 | A mark is any upper-case or lower-case letter.
|
---|
1664 | Certain marks are predefined:
|
---|
1665 | ^ means beginning of the file
|
---|
1666 | $ means end of the file
|
---|
1667 | ---------------------------------------------------------------------------
|
---|
1668 | CHANGING FILES
|
---|
1669 | :e [file] Examine a new file.
|
---|
1670 | ^X^V Same as :e.
|
---|
1671 | :n * Examine the (N-th) next file from the command line.
|
---|
1672 | :p * Examine the (N-th) previous file from the command line.
|
---|
1673 | :x * Examine the first (or N-th) file from the command line.
|
---|
1674 | :d Delete the current file from the command line list.
|
---|
1675 | = ^G :f Print current file name.
|
---|
1676 | ---------------------------------------------------------------------------
|
---|
1677 | MISCELLANEOUS COMMANDS
|
---|
1678 | -<flag> Toggle a command line option [see OPTIONS below].
|
---|
1679 | --<name> Toggle a command line option, by name.
|
---|
1680 | _<flag> Display the setting of a command line option.
|
---|
1681 | __<name> Display the setting of an option, by name.
|
---|
1682 | +cmd Execute the less cmd each time a new file is examined.
|
---|
1683 | !command Execute the shell command with $SHELL.
|
---|
1684 | |Xcommand Pipe file between current pos & mark X to shell command.
|
---|
1685 | v Edit the current file with $VISUAL or $EDITOR.
|
---|
1686 | V Print version number of "less".
|
---|
1687 | ---------------------------------------------------------------------------
|
---|
1688 | OPTIONS
|
---|
1689 | Most options may be changed either on the command line,
|
---|
1690 | or from within less by using the - or -- command.
|
---|
1691 | Options may be given in one of two forms: either a single
|
---|
1692 | character preceded by a -, or a name preceeded by --.
|
---|
1693 | -? ........ --help
|
---|
1694 | Display help (from command line).
|
---|
1695 | -a ........ --search-skip-screen
|
---|
1696 | Forward search skips current screen.
|
---|
1697 | -b [N] .... --buffers=[N]
|
---|
1698 | Number of buffers.
|
---|
1699 | -B ........ --auto-buffers
|
---|
1700 | Don't automatically allocate buffers for pipes.
|
---|
1701 | -c ........ --clear-screen
|
---|
1702 | Repaint by clearing rather than scrolling.
|
---|
1703 | -d ........ --dumb
|
---|
1704 | Dumb terminal.
|
---|
1705 | -D [xn.n] . --color=xn.n
|
---|
1706 | Set screen colors. (MS-DOS only)
|
---|
1707 | -e -E .... --quit-at-eof --QUIT-AT-EOF
|
---|
1708 | Quit at end of file.
|
---|
1709 | -f ........ --force
|
---|
1710 | Force open non-regular files.
|
---|
1711 | -F ........ --quit-if-one-screen
|
---|
1712 | Quit if entire file fits on first screen.
|
---|
1713 | -g ........ --hilite-search
|
---|
1714 | Highlight only last match for searches.
|
---|
1715 | -G ........ --HILITE-SEARCH
|
---|
1716 | Don't highlight any matches for searches.
|
---|
1717 | -h [N] .... --max-back-scroll=[N]
|
---|
1718 | Backward scroll limit.
|
---|
1719 | -i ........ --ignore-case
|
---|
1720 | Ignore case in searches that do not contain uppercase.
|
---|
1721 | -I ........ --IGNORE-CASE
|
---|
1722 | Ignore case in all searches.
|
---|
1723 | -j [N] .... --jump-target=[N]
|
---|
1724 | Screen position of target lines.
|
---|
1725 | -J ........ --status-column
|
---|
1726 | Display a status column at left edge of screen.
|
---|
1727 | -k [file] . --lesskey-file=[file]
|
---|
1728 | Use a lesskey file.
|
---|
1729 | -L ........ --no-lessopen
|
---|
1730 | Ignore the LESSOPEN environment variable.
|
---|
1731 | -m -M .... --long-prompt --LONG-PROMPT
|
---|
1732 | Set prompt style.
|
---|
1733 | -n -N .... --line-numbers --LINE-NUMBERS
|
---|
1734 | Don't use line numbers.
|
---|
1735 | -o [file] . --log-file=[file]
|
---|
1736 | Copy to log file (standard input only).
|
---|
1737 | -O [file] . --LOG-FILE=[file]
|
---|
1738 | Copy to log file (unconditionally overwrite).
|
---|
1739 | -p [pattern] --pattern=[pattern]
|
---|
1740 | Start at pattern (from command line).
|
---|
1741 | -P [prompt] --prompt=[prompt]
|
---|
1742 | Define new prompt.
|
---|
1743 | -q -Q .... --quiet --QUIET --silent --SILENT
|
---|
1744 | Quiet the terminal bell.
|
---|
1745 | -r -R .... --raw-control-chars --RAW-CONTROL-CHARS
|
---|
1746 | Output "raw" control characters.
|
---|
1747 | -s ........ --squeeze-blank-lines
|
---|
1748 | Squeeze multiple blank lines.
|
---|
1749 | -S ........ --chop-long-lines
|
---|
1750 | Chop long lines.
|
---|
1751 | -t [tag] .. --tag=[tag]
|
---|
1752 | Find a tag.
|
---|
1753 | -T [tagsfile] --tag-file=[tagsfile]
|
---|
1754 | Use an alternate tags file.
|
---|
1755 | -u -U .... --underline-special --UNDERLINE-SPECIAL
|
---|
1756 | Change handling of backspaces.
|
---|
1757 | -V ........ --version
|
---|
1758 | Display the version number of "less".
|
---|
1759 | -w ........ --hilite-unread
|
---|
1760 | Highlight first new line after forward-screen.
|
---|
1761 | -W ........ --HILITE-UNREAD
|
---|
1762 | Highlight first new line after any forward movement.
|
---|
1763 | -x [N[,...]] --tabs=[N[,...]]
|
---|
1764 | Set tab stops.
|
---|
1765 | -X ........ --no-init
|
---|
1766 | Don't use termcap init/deinit strings.
|
---|
1767 | --no-keypad
|
---|
1768 | Don't use termcap keypad init/deinit strings.
|
---|
1769 | -y [N] .... --max-forw-scroll=[N]
|
---|
1770 | Forward scroll limit.
|
---|
1771 | -z [N] .... --window=[N]
|
---|
1772 | Set size of window.
|
---|
1773 | -" [c[c]] . --quotes=[c[c]]
|
---|
1774 | Set shell quote characters.
|
---|
1775 | -~ ........ --tilde
|
---|
1776 | Don't display tildes after end of file.
|
---|
1777 | -# [N] .... --shift=[N]
|
---|
1778 | Horizontal scroll amount (0 = one half screen width)
|
---|
1779 |
|
---|
1780 | ---------------------------------------------------------------------------
|
---|
1781 | LINE EDITING
|
---|
1782 | These keys can be used to edit text being entered
|
---|
1783 | on the "command line" at the bottom of the screen.
|
---|
1784 | RightArrow ESC-l Move cursor right one character.
|
---|
1785 | LeftArrow ESC-h Move cursor left one character.
|
---|
1786 | CNTL-RightArrow ESC-RightArrow ESC-w Move cursor right one word.
|
---|
1787 | CNTL-LeftArrow ESC-LeftArrow ESC-b Move cursor left one word.
|
---|
1788 | HOME ESC-0 Move cursor to start of line.
|
---|
1789 | END ESC-$ Move cursor to end of line.
|
---|
1790 | BACKSPACE Delete char to left of cursor.
|
---|
1791 | DELETE ESC-x Delete char under cursor.
|
---|
1792 | CNTL-BACKSPACE ESC-BACKSPACE Delete word to left of cursor.
|
---|
1793 | CNTL-DELETE ESC-DELETE ESC-X Delete word under cursor.
|
---|
1794 | CNTL-U ESC (MS-DOS only) Delete entire line.
|
---|
1795 | UpArrow ESC-k Retrieve previous command line.
|
---|
1796 | DownArrow ESC-j Retrieve next command line.
|
---|
1797 | TAB Complete filename & cycle.
|
---|
1798 | SHIFT-TAB ESC-TAB Complete filename & reverse cycle.
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1799 | CNTL-L Complete filename, list all.
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1800 | */
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