[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * Mini less implementation for busybox
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 2005 by Rob Sullivan <cogito.ergo.cogito@gmail.com>
|
---|
| 6 | *
|
---|
[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
[821] | 8 | */
|
---|
| 9 |
|
---|
| 10 | /*
|
---|
[1765] | 11 | * TODO:
|
---|
| 12 | * - Add more regular expression support - search modifiers, certain matches, etc.
|
---|
| 13 | * - Add more complex bracket searching - currently, nested brackets are
|
---|
| 14 | * not considered.
|
---|
| 15 | * - Add support for "F" as an input. This causes less to act in
|
---|
| 16 | * a similar way to tail -f.
|
---|
| 17 | * - Allow horizontal scrolling.
|
---|
[821] | 18 | *
|
---|
[1765] | 19 | * Notes:
|
---|
| 20 | * - the inp file pointer is used so that keyboard input works after
|
---|
| 21 | * redirected input has been read from stdin
|
---|
| 22 | */
|
---|
[821] | 23 |
|
---|
[3232] | 24 | //config:config LESS
|
---|
| 25 | //config: bool "less"
|
---|
| 26 | //config: default y
|
---|
| 27 | //config: help
|
---|
| 28 | //config: 'less' is a pager, meaning that it displays text files. It possesses
|
---|
| 29 | //config: a wide array of features, and is an improvement over 'more'.
|
---|
| 30 | //config:
|
---|
| 31 | //config:config FEATURE_LESS_MAXLINES
|
---|
| 32 | //config: int "Max number of input lines less will try to eat"
|
---|
| 33 | //config: default 9999999
|
---|
| 34 | //config: depends on LESS
|
---|
| 35 | //config:
|
---|
| 36 | //config:config FEATURE_LESS_BRACKETS
|
---|
| 37 | //config: bool "Enable bracket searching"
|
---|
| 38 | //config: default y
|
---|
| 39 | //config: depends on LESS
|
---|
| 40 | //config: help
|
---|
| 41 | //config: This option adds the capability to search for matching left and right
|
---|
| 42 | //config: brackets, facilitating programming.
|
---|
| 43 | //config:
|
---|
| 44 | //config:config FEATURE_LESS_FLAGS
|
---|
| 45 | //config: bool "Enable -m/-M"
|
---|
| 46 | //config: default y
|
---|
| 47 | //config: depends on LESS
|
---|
| 48 | //config: help
|
---|
| 49 | //config: The -M/-m flag enables a more sophisticated status line.
|
---|
| 50 | //config:
|
---|
| 51 | //config:config FEATURE_LESS_MARKS
|
---|
| 52 | //config: bool "Enable marks"
|
---|
| 53 | //config: default y
|
---|
| 54 | //config: depends on LESS
|
---|
| 55 | //config: help
|
---|
| 56 | //config: Marks enable positions in a file to be stored for easy reference.
|
---|
| 57 | //config:
|
---|
| 58 | //config:config FEATURE_LESS_REGEXP
|
---|
| 59 | //config: bool "Enable regular expressions"
|
---|
| 60 | //config: default y
|
---|
| 61 | //config: depends on LESS
|
---|
| 62 | //config: help
|
---|
| 63 | //config: Enable regular expressions, allowing complex file searches.
|
---|
| 64 | //config:
|
---|
| 65 | //config:config FEATURE_LESS_WINCH
|
---|
| 66 | //config: bool "Enable automatic resizing on window size changes"
|
---|
| 67 | //config: default y
|
---|
| 68 | //config: depends on LESS
|
---|
| 69 | //config: help
|
---|
| 70 | //config: Makes less track window size changes.
|
---|
| 71 | //config:
|
---|
| 72 | //config:config FEATURE_LESS_ASK_TERMINAL
|
---|
| 73 | //config: bool "Use 'tell me cursor position' ESC sequence to measure window"
|
---|
| 74 | //config: default y
|
---|
| 75 | //config: depends on FEATURE_LESS_WINCH
|
---|
| 76 | //config: help
|
---|
| 77 | //config: Makes less track window size changes.
|
---|
| 78 | //config: If terminal size can't be retrieved and $LINES/$COLUMNS are not set,
|
---|
| 79 | //config: this option makes less perform a last-ditch effort to find it:
|
---|
| 80 | //config: position cursor to 999,999 and ask terminal to report real
|
---|
| 81 | //config: cursor position using "ESC [ 6 n" escape sequence, then read stdin.
|
---|
| 82 | //config:
|
---|
| 83 | //config: This is not clean but helps a lot on serial lines and such.
|
---|
| 84 | //config:
|
---|
| 85 | //config:config FEATURE_LESS_DASHCMD
|
---|
| 86 | //config: bool "Enable flag changes ('-' command)"
|
---|
| 87 | //config: default y
|
---|
| 88 | //config: depends on LESS
|
---|
| 89 | //config: help
|
---|
| 90 | //config: This enables the ability to change command-line flags within
|
---|
| 91 | //config: less itself ('-' keyboard command).
|
---|
| 92 | //config:
|
---|
| 93 | //config:config FEATURE_LESS_LINENUMS
|
---|
| 94 | //config: bool "Enable dynamic switching of line numbers"
|
---|
| 95 | //config: default y
|
---|
| 96 | //config: depends on FEATURE_LESS_DASHCMD
|
---|
| 97 | //config: help
|
---|
| 98 | //config: Enables "-N" command.
|
---|
| 99 |
|
---|
| 100 | //usage:#define less_trivial_usage
|
---|
| 101 | //usage: "[-E" IF_FEATURE_LESS_FLAGS("Mm") "Nh~I?] [FILE]..."
|
---|
| 102 | //usage:#define less_full_usage "\n\n"
|
---|
| 103 | //usage: "View FILE (or stdin) one screenful at a time\n"
|
---|
| 104 | //usage: "\n -E Quit once the end of a file is reached"
|
---|
| 105 | //usage: IF_FEATURE_LESS_FLAGS(
|
---|
| 106 | //usage: "\n -M,-m Display status line with line numbers"
|
---|
| 107 | //usage: "\n and percentage through the file"
|
---|
| 108 | //usage: )
|
---|
| 109 | //usage: "\n -N Prefix line number to each line"
|
---|
| 110 | //usage: "\n -I Ignore case in all searches"
|
---|
| 111 | //usage: "\n -~ Suppress ~s displayed past EOF"
|
---|
| 112 |
|
---|
[2725] | 113 | #include <sched.h> /* sched_yield() */
|
---|
[821] | 114 |
|
---|
[1765] | 115 | #include "libbb.h"
|
---|
| 116 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
[821] | 117 | #include "xregex.h"
|
---|
| 118 | #endif
|
---|
| 119 |
|
---|
| 120 |
|
---|
[2725] | 121 | #define ESC "\033"
|
---|
[821] | 122 | /* The escape codes for highlighted and normal text */
|
---|
[2725] | 123 | #define HIGHLIGHT ESC"[7m"
|
---|
| 124 | #define NORMAL ESC"[0m"
|
---|
| 125 | /* The escape code to home and clear to the end of screen */
|
---|
| 126 | #define CLEAR ESC"[H\033[J"
|
---|
| 127 | /* The escape code to clear to the end of line */
|
---|
| 128 | #define CLEAR_2_EOL ESC"[K"
|
---|
[821] | 129 |
|
---|
[1765] | 130 | enum {
|
---|
| 131 | /* Absolute max of lines eaten */
|
---|
| 132 | MAXLINES = CONFIG_FEATURE_LESS_MAXLINES,
|
---|
| 133 | /* This many "after the end" lines we will show (at max) */
|
---|
| 134 | TILDES = 1,
|
---|
| 135 | };
|
---|
| 136 |
|
---|
[821] | 137 | /* Command line options */
|
---|
[1765] | 138 | enum {
|
---|
[2725] | 139 | FLAG_E = 1 << 0,
|
---|
[1765] | 140 | FLAG_M = 1 << 1,
|
---|
| 141 | FLAG_m = 1 << 2,
|
---|
| 142 | FLAG_N = 1 << 3,
|
---|
| 143 | FLAG_TILDE = 1 << 4,
|
---|
[2725] | 144 | FLAG_I = 1 << 5,
|
---|
| 145 | FLAG_S = (1 << 6) * ENABLE_FEATURE_LESS_DASHCMD,
|
---|
[1765] | 146 | /* hijack command line options variable for internal state vars */
|
---|
| 147 | LESS_STATE_MATCH_BACKWARDS = 1 << 15,
|
---|
| 148 | };
|
---|
[821] | 149 |
|
---|
[1765] | 150 | #if !ENABLE_FEATURE_LESS_REGEXP
|
---|
| 151 | enum { pattern_valid = 0 };
|
---|
[821] | 152 | #endif
|
---|
| 153 |
|
---|
[1765] | 154 | struct globals {
|
---|
| 155 | int cur_fline; /* signed */
|
---|
| 156 | int kbd_fd; /* fd to get input from */
|
---|
[2725] | 157 | int less_gets_pos;
|
---|
[1765] | 158 | /* last position in last line, taking into account tabs */
|
---|
[2725] | 159 | size_t last_line_pos;
|
---|
[1765] | 160 | unsigned max_fline;
|
---|
| 161 | unsigned max_lineno; /* this one tracks linewrap */
|
---|
[2725] | 162 | unsigned max_displayed_line;
|
---|
[1765] | 163 | unsigned width;
|
---|
[2725] | 164 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 165 | unsigned winch_counter;
|
---|
| 166 | #endif
|
---|
[1765] | 167 | ssize_t eof_error; /* eof if 0, error if < 0 */
|
---|
[2725] | 168 | ssize_t readpos;
|
---|
| 169 | ssize_t readeof; /* must be signed */
|
---|
[1765] | 170 | const char **buffer;
|
---|
| 171 | const char **flines;
|
---|
| 172 | const char *empty_line_marker;
|
---|
| 173 | unsigned num_files;
|
---|
| 174 | unsigned current_file;
|
---|
| 175 | char *filename;
|
---|
| 176 | char **files;
|
---|
| 177 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
| 178 | unsigned num_marks;
|
---|
| 179 | unsigned mark_lines[15][2];
|
---|
[821] | 180 | #endif
|
---|
[1765] | 181 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 182 | unsigned *match_lines;
|
---|
| 183 | int match_pos; /* signed! */
|
---|
[2725] | 184 | int wanted_match; /* signed! */
|
---|
| 185 | int num_matches;
|
---|
[1765] | 186 | regex_t pattern;
|
---|
| 187 | smallint pattern_valid;
|
---|
| 188 | #endif
|
---|
[3232] | 189 | #if ENABLE_FEATURE_LESS_ASK_TERMINAL
|
---|
| 190 | smallint winsize_err;
|
---|
| 191 | #endif
|
---|
[1765] | 192 | smallint terminated;
|
---|
| 193 | struct termios term_orig, term_less;
|
---|
[2725] | 194 | char kbd_input[KEYCODE_BUFFER_SIZE];
|
---|
[1765] | 195 | };
|
---|
| 196 | #define G (*ptr_to_globals)
|
---|
| 197 | #define cur_fline (G.cur_fline )
|
---|
| 198 | #define kbd_fd (G.kbd_fd )
|
---|
[2725] | 199 | #define less_gets_pos (G.less_gets_pos )
|
---|
| 200 | #define last_line_pos (G.last_line_pos )
|
---|
[1765] | 201 | #define max_fline (G.max_fline )
|
---|
| 202 | #define max_lineno (G.max_lineno )
|
---|
[2725] | 203 | #define max_displayed_line (G.max_displayed_line)
|
---|
[1765] | 204 | #define width (G.width )
|
---|
[2725] | 205 | #define winch_counter (G.winch_counter )
|
---|
| 206 | /* This one is 100% not cached by compiler on read access */
|
---|
| 207 | #define WINCH_COUNTER (*(volatile unsigned *)&winch_counter)
|
---|
[1765] | 208 | #define eof_error (G.eof_error )
|
---|
| 209 | #define readpos (G.readpos )
|
---|
| 210 | #define readeof (G.readeof )
|
---|
| 211 | #define buffer (G.buffer )
|
---|
| 212 | #define flines (G.flines )
|
---|
| 213 | #define empty_line_marker (G.empty_line_marker )
|
---|
| 214 | #define num_files (G.num_files )
|
---|
| 215 | #define current_file (G.current_file )
|
---|
| 216 | #define filename (G.filename )
|
---|
| 217 | #define files (G.files )
|
---|
| 218 | #define num_marks (G.num_marks )
|
---|
| 219 | #define mark_lines (G.mark_lines )
|
---|
| 220 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 221 | #define match_lines (G.match_lines )
|
---|
| 222 | #define match_pos (G.match_pos )
|
---|
| 223 | #define num_matches (G.num_matches )
|
---|
[2725] | 224 | #define wanted_match (G.wanted_match )
|
---|
[1765] | 225 | #define pattern (G.pattern )
|
---|
| 226 | #define pattern_valid (G.pattern_valid )
|
---|
| 227 | #endif
|
---|
| 228 | #define terminated (G.terminated )
|
---|
| 229 | #define term_orig (G.term_orig )
|
---|
| 230 | #define term_less (G.term_less )
|
---|
[2725] | 231 | #define kbd_input (G.kbd_input )
|
---|
[1765] | 232 | #define INIT_G() do { \
|
---|
[2725] | 233 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
|
---|
| 234 | less_gets_pos = -1; \
|
---|
| 235 | empty_line_marker = "~"; \
|
---|
| 236 | num_files = 1; \
|
---|
| 237 | current_file = 1; \
|
---|
| 238 | eof_error = 1; \
|
---|
| 239 | terminated = 1; \
|
---|
| 240 | IF_FEATURE_LESS_REGEXP(wanted_match = -1;) \
|
---|
| 241 | } while (0)
|
---|
[821] | 242 |
|
---|
[2725] | 243 | /* flines[] are lines read from stdin, each in malloc'ed buffer.
|
---|
| 244 | * Line numbers are stored as uint32_t prepended to each line.
|
---|
| 245 | * Pointer is adjusted so that flines[i] points directly past
|
---|
| 246 | * line number. Accesor: */
|
---|
| 247 | #define MEMPTR(p) ((char*)(p) - 4)
|
---|
| 248 | #define LINENO(p) (*(uint32_t*)((p) - 4))
|
---|
| 249 |
|
---|
| 250 |
|
---|
[821] | 251 | /* Reset terminal input to normal */
|
---|
| 252 | static void set_tty_cooked(void)
|
---|
| 253 | {
|
---|
[2725] | 254 | fflush_all();
|
---|
[1765] | 255 | tcsetattr(kbd_fd, TCSANOW, &term_orig);
|
---|
[821] | 256 | }
|
---|
| 257 |
|
---|
| 258 | /* Move the cursor to a position (x,y), where (0,0) is the
|
---|
| 259 | top-left corner of the console */
|
---|
[1765] | 260 | static void move_cursor(int line, int row)
|
---|
[821] | 261 | {
|
---|
[2725] | 262 | printf(ESC"[%u;%uH", line, row);
|
---|
[821] | 263 | }
|
---|
| 264 |
|
---|
| 265 | static void clear_line(void)
|
---|
| 266 | {
|
---|
[2725] | 267 | printf(ESC"[%u;0H" CLEAR_2_EOL, max_displayed_line + 2);
|
---|
[821] | 268 | }
|
---|
| 269 |
|
---|
[1765] | 270 | static void print_hilite(const char *str)
|
---|
[821] | 271 | {
|
---|
[1765] | 272 | printf(HIGHLIGHT"%s"NORMAL, str);
|
---|
| 273 | }
|
---|
[821] | 274 |
|
---|
[1765] | 275 | static void print_statusline(const char *str)
|
---|
| 276 | {
|
---|
| 277 | clear_line();
|
---|
| 278 | printf(HIGHLIGHT"%.*s"NORMAL, width - 1, str);
|
---|
[821] | 279 | }
|
---|
| 280 |
|
---|
[2725] | 281 | /* Exit the program gracefully */
|
---|
| 282 | static void less_exit(int code)
|
---|
| 283 | {
|
---|
| 284 | set_tty_cooked();
|
---|
| 285 | clear_line();
|
---|
| 286 | if (code < 0)
|
---|
| 287 | kill_myself_with_sig(- code); /* does not return */
|
---|
| 288 | exit(code);
|
---|
| 289 | }
|
---|
| 290 |
|
---|
| 291 | #if (ENABLE_FEATURE_LESS_DASHCMD && ENABLE_FEATURE_LESS_LINENUMS) \
|
---|
| 292 | || ENABLE_FEATURE_LESS_WINCH
|
---|
| 293 | static void re_wrap(void)
|
---|
| 294 | {
|
---|
| 295 | int w = width;
|
---|
| 296 | int new_line_pos;
|
---|
| 297 | int src_idx;
|
---|
| 298 | int dst_idx;
|
---|
| 299 | int new_cur_fline = 0;
|
---|
| 300 | uint32_t lineno;
|
---|
| 301 | char linebuf[w + 1];
|
---|
| 302 | const char **old_flines = flines;
|
---|
| 303 | const char *s;
|
---|
| 304 | char **new_flines = NULL;
|
---|
| 305 | char *d;
|
---|
| 306 |
|
---|
| 307 | if (option_mask32 & FLAG_N)
|
---|
| 308 | w -= 8;
|
---|
| 309 |
|
---|
| 310 | src_idx = 0;
|
---|
| 311 | dst_idx = 0;
|
---|
| 312 | s = old_flines[0];
|
---|
| 313 | lineno = LINENO(s);
|
---|
| 314 | d = linebuf;
|
---|
| 315 | new_line_pos = 0;
|
---|
| 316 | while (1) {
|
---|
| 317 | *d = *s;
|
---|
| 318 | if (*d != '\0') {
|
---|
| 319 | new_line_pos++;
|
---|
| 320 | if (*d == '\t') /* tab */
|
---|
| 321 | new_line_pos += 7;
|
---|
| 322 | s++;
|
---|
| 323 | d++;
|
---|
| 324 | if (new_line_pos >= w) {
|
---|
| 325 | int sz;
|
---|
| 326 | /* new line is full, create next one */
|
---|
| 327 | *d = '\0';
|
---|
| 328 | next_new:
|
---|
| 329 | sz = (d - linebuf) + 1; /* + 1: NUL */
|
---|
| 330 | d = ((char*)xmalloc(sz + 4)) + 4;
|
---|
| 331 | LINENO(d) = lineno;
|
---|
| 332 | memcpy(d, linebuf, sz);
|
---|
| 333 | new_flines = xrealloc_vector(new_flines, 8, dst_idx);
|
---|
| 334 | new_flines[dst_idx] = d;
|
---|
| 335 | dst_idx++;
|
---|
| 336 | if (new_line_pos < w) {
|
---|
| 337 | /* if we came here thru "goto next_new" */
|
---|
| 338 | if (src_idx > max_fline)
|
---|
| 339 | break;
|
---|
| 340 | lineno = LINENO(s);
|
---|
| 341 | }
|
---|
| 342 | d = linebuf;
|
---|
| 343 | new_line_pos = 0;
|
---|
| 344 | }
|
---|
| 345 | continue;
|
---|
| 346 | }
|
---|
| 347 | /* *d == NUL: old line ended, go to next old one */
|
---|
| 348 | free(MEMPTR(old_flines[src_idx]));
|
---|
| 349 | /* btw, convert cur_fline... */
|
---|
| 350 | if (cur_fline == src_idx)
|
---|
| 351 | new_cur_fline = dst_idx;
|
---|
| 352 | src_idx++;
|
---|
| 353 | /* no more lines? finish last new line (and exit the loop) */
|
---|
| 354 | if (src_idx > max_fline)
|
---|
| 355 | goto next_new;
|
---|
| 356 | s = old_flines[src_idx];
|
---|
| 357 | if (lineno != LINENO(s)) {
|
---|
| 358 | /* this is not a continuation line!
|
---|
| 359 | * create next _new_ line too */
|
---|
| 360 | goto next_new;
|
---|
| 361 | }
|
---|
| 362 | }
|
---|
| 363 |
|
---|
| 364 | free(old_flines);
|
---|
| 365 | flines = (const char **)new_flines;
|
---|
| 366 |
|
---|
| 367 | max_fline = dst_idx - 1;
|
---|
| 368 | last_line_pos = new_line_pos;
|
---|
| 369 | cur_fline = new_cur_fline;
|
---|
| 370 | /* max_lineno is screen-size independent */
|
---|
[1765] | 371 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
[2725] | 372 | pattern_valid = 0;
|
---|
| 373 | #endif
|
---|
| 374 | }
|
---|
| 375 | #endif
|
---|
| 376 |
|
---|
| 377 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
[1765] | 378 | static void fill_match_lines(unsigned pos);
|
---|
| 379 | #else
|
---|
| 380 | #define fill_match_lines(pos) ((void)0)
|
---|
| 381 | #endif
|
---|
| 382 |
|
---|
| 383 | /* Devilishly complex routine.
|
---|
| 384 | *
|
---|
| 385 | * Has to deal with EOF and EPIPE on input,
|
---|
| 386 | * with line wrapping, with last line not ending in '\n'
|
---|
| 387 | * (possibly not ending YET!), with backspace and tabs.
|
---|
| 388 | * It reads input again if last time we got an EOF (thus supporting
|
---|
| 389 | * growing files) or EPIPE (watching output of slow process like make).
|
---|
| 390 | *
|
---|
| 391 | * Variables used:
|
---|
| 392 | * flines[] - array of lines already read. Linewrap may cause
|
---|
| 393 | * one source file line to occupy several flines[n].
|
---|
| 394 | * flines[max_fline] - last line, possibly incomplete.
|
---|
| 395 | * terminated - 1 if flines[max_fline] is 'terminated'
|
---|
| 396 | * (if there was '\n' [which isn't stored itself, we just remember
|
---|
| 397 | * that it was seen])
|
---|
| 398 | * max_lineno - last line's number, this one doesn't increment
|
---|
| 399 | * on line wrap, only on "real" new lines.
|
---|
| 400 | * readbuf[0..readeof-1] - small preliminary buffer.
|
---|
| 401 | * readbuf[readpos] - next character to add to current line.
|
---|
[2725] | 402 | * last_line_pos - screen line position of next char to be read
|
---|
[1765] | 403 | * (takes into account tabs and backspaces)
|
---|
| 404 | * eof_error - < 0 error, == 0 EOF, > 0 not EOF/error
|
---|
| 405 | */
|
---|
| 406 | static void read_lines(void)
|
---|
[821] | 407 | {
|
---|
[1765] | 408 | #define readbuf bb_common_bufsiz1
|
---|
| 409 | char *current_line, *p;
|
---|
| 410 | int w = width;
|
---|
| 411 | char last_terminated = terminated;
|
---|
[2725] | 412 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 413 | unsigned old_max_fline = max_fline;
|
---|
| 414 | time_t last_time = 0;
|
---|
| 415 | unsigned seconds_p1 = 3; /* seconds_to_loop + 1 */
|
---|
| 416 | #endif
|
---|
[821] | 417 |
|
---|
[1765] | 418 | if (option_mask32 & FLAG_N)
|
---|
| 419 | w -= 8;
|
---|
| 420 |
|
---|
[2725] | 421 | IF_FEATURE_LESS_REGEXP(again0:)
|
---|
| 422 |
|
---|
| 423 | p = current_line = ((char*)xmalloc(w + 4)) + 4;
|
---|
[1765] | 424 | max_fline += last_terminated;
|
---|
| 425 | if (!last_terminated) {
|
---|
| 426 | const char *cp = flines[max_fline];
|
---|
[2725] | 427 | strcpy(p, cp);
|
---|
[1765] | 428 | p += strlen(current_line);
|
---|
[2725] | 429 | free(MEMPTR(flines[max_fline]));
|
---|
| 430 | /* last_line_pos is still valid from previous read_lines() */
|
---|
[1765] | 431 | } else {
|
---|
[2725] | 432 | last_line_pos = 0;
|
---|
[821] | 433 | }
|
---|
| 434 |
|
---|
[2725] | 435 | while (1) { /* read lines until we reach cur_fline or wanted_match */
|
---|
[1765] | 436 | *p = '\0';
|
---|
| 437 | terminated = 0;
|
---|
[2725] | 438 | while (1) { /* read chars until we have a line */
|
---|
[1765] | 439 | char c;
|
---|
| 440 | /* if no unprocessed chars left, eat more */
|
---|
| 441 | if (readpos >= readeof) {
|
---|
| 442 | ndelay_on(0);
|
---|
[2725] | 443 | eof_error = safe_read(STDIN_FILENO, readbuf, sizeof(readbuf));
|
---|
| 444 | ndelay_off(0);
|
---|
[1765] | 445 | readpos = 0;
|
---|
| 446 | readeof = eof_error;
|
---|
[2725] | 447 | if (eof_error <= 0)
|
---|
[1765] | 448 | goto reached_eof;
|
---|
| 449 | }
|
---|
| 450 | c = readbuf[readpos];
|
---|
| 451 | /* backspace? [needed for manpages] */
|
---|
| 452 | /* <tab><bs> is (a) insane and */
|
---|
| 453 | /* (b) harder to do correctly, so we refuse to do it */
|
---|
[2725] | 454 | if (c == '\x8' && last_line_pos && p[-1] != '\t') {
|
---|
[1765] | 455 | readpos++; /* eat it */
|
---|
[2725] | 456 | last_line_pos--;
|
---|
[1765] | 457 | /* was buggy (p could end up <= current_line)... */
|
---|
| 458 | *--p = '\0';
|
---|
| 459 | continue;
|
---|
| 460 | }
|
---|
| 461 | {
|
---|
[2725] | 462 | size_t new_last_line_pos = last_line_pos + 1;
|
---|
[1765] | 463 | if (c == '\t') {
|
---|
[2725] | 464 | new_last_line_pos += 7;
|
---|
| 465 | new_last_line_pos &= (~7);
|
---|
[1765] | 466 | }
|
---|
[2725] | 467 | if ((int)new_last_line_pos >= w)
|
---|
[1765] | 468 | break;
|
---|
[2725] | 469 | last_line_pos = new_last_line_pos;
|
---|
[1765] | 470 | }
|
---|
| 471 | /* ok, we will eat this char */
|
---|
| 472 | readpos++;
|
---|
| 473 | if (c == '\n') {
|
---|
| 474 | terminated = 1;
|
---|
[2725] | 475 | last_line_pos = 0;
|
---|
[1765] | 476 | break;
|
---|
| 477 | }
|
---|
| 478 | /* NUL is substituted by '\n'! */
|
---|
| 479 | if (c == '\0') c = '\n';
|
---|
| 480 | *p++ = c;
|
---|
| 481 | *p = '\0';
|
---|
[2725] | 482 | } /* end of "read chars until we have a line" loop */
|
---|
[1765] | 483 | /* Corner case: linewrap with only "" wrapping to next line */
|
---|
| 484 | /* Looks ugly on screen, so we do not store this empty line */
|
---|
| 485 | if (!last_terminated && !current_line[0]) {
|
---|
| 486 | last_terminated = 1;
|
---|
| 487 | max_lineno++;
|
---|
[2725] | 488 | continue;
|
---|
[1765] | 489 | }
|
---|
| 490 | reached_eof:
|
---|
| 491 | last_terminated = terminated;
|
---|
[2725] | 492 | flines = xrealloc_vector(flines, 8, max_fline);
|
---|
| 493 |
|
---|
| 494 | flines[max_fline] = (char*)xrealloc(MEMPTR(current_line), strlen(current_line) + 1 + 4) + 4;
|
---|
| 495 | LINENO(flines[max_fline]) = max_lineno;
|
---|
| 496 | if (terminated)
|
---|
| 497 | max_lineno++;
|
---|
| 498 |
|
---|
[1765] | 499 | if (max_fline >= MAXLINES) {
|
---|
| 500 | eof_error = 0; /* Pretend we saw EOF */
|
---|
| 501 | break;
|
---|
| 502 | }
|
---|
[2725] | 503 | if (!(option_mask32 & FLAG_S)
|
---|
| 504 | ? (max_fline > cur_fline + max_displayed_line)
|
---|
| 505 | : (max_fline >= cur_fline
|
---|
| 506 | && max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
|
---|
| 507 | ) {
|
---|
| 508 | #if !ENABLE_FEATURE_LESS_REGEXP
|
---|
[1765] | 509 | break;
|
---|
[2725] | 510 | #else
|
---|
| 511 | if (wanted_match >= num_matches) { /* goto_match called us */
|
---|
| 512 | fill_match_lines(old_max_fline);
|
---|
| 513 | old_max_fline = max_fline;
|
---|
| 514 | }
|
---|
| 515 | if (wanted_match < num_matches)
|
---|
| 516 | break;
|
---|
| 517 | #endif
|
---|
| 518 | }
|
---|
[1765] | 519 | if (eof_error <= 0) {
|
---|
[2725] | 520 | if (eof_error < 0) {
|
---|
| 521 | if (errno == EAGAIN) {
|
---|
| 522 | /* not yet eof or error, reset flag (or else
|
---|
| 523 | * we will hog CPU - select() will return
|
---|
| 524 | * immediately */
|
---|
| 525 | eof_error = 1;
|
---|
| 526 | } else {
|
---|
| 527 | print_statusline(bb_msg_read_error);
|
---|
| 528 | }
|
---|
[1765] | 529 | }
|
---|
[2725] | 530 | #if !ENABLE_FEATURE_LESS_REGEXP
|
---|
[1765] | 531 | break;
|
---|
[2725] | 532 | #else
|
---|
| 533 | if (wanted_match < num_matches) {
|
---|
| 534 | break;
|
---|
| 535 | } else { /* goto_match called us */
|
---|
| 536 | time_t t = time(NULL);
|
---|
| 537 | if (t != last_time) {
|
---|
| 538 | last_time = t;
|
---|
| 539 | if (--seconds_p1 == 0)
|
---|
| 540 | break;
|
---|
| 541 | }
|
---|
| 542 | sched_yield();
|
---|
| 543 | goto again0; /* go loop again (max 2 seconds) */
|
---|
| 544 | }
|
---|
| 545 | #endif
|
---|
[1765] | 546 | }
|
---|
| 547 | max_fline++;
|
---|
[2725] | 548 | current_line = ((char*)xmalloc(w + 4)) + 4;
|
---|
[1765] | 549 | p = current_line;
|
---|
[2725] | 550 | last_line_pos = 0;
|
---|
| 551 | } /* end of "read lines until we reach cur_fline" loop */
|
---|
[1765] | 552 | fill_match_lines(old_max_fline);
|
---|
[2725] | 553 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 554 | /* prevent us from being stuck in search for a match */
|
---|
| 555 | wanted_match = -1;
|
---|
| 556 | #endif
|
---|
[1765] | 557 | #undef readbuf
|
---|
[821] | 558 | }
|
---|
| 559 |
|
---|
[1765] | 560 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 561 | /* Interestingly, writing calc_percent as a function saves around 32 bytes
|
---|
[821] | 562 | * on my build. */
|
---|
| 563 | static int calc_percent(void)
|
---|
| 564 | {
|
---|
[1765] | 565 | unsigned p = (100 * (cur_fline+max_displayed_line+1) + max_fline/2) / (max_fline+1);
|
---|
| 566 | return p <= 100 ? p : 100;
|
---|
[821] | 567 | }
|
---|
| 568 |
|
---|
| 569 | /* Print a status line if -M was specified */
|
---|
| 570 | static void m_status_print(void)
|
---|
| 571 | {
|
---|
| 572 | int percentage;
|
---|
| 573 |
|
---|
[2725] | 574 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
| 575 | return;
|
---|
| 576 |
|
---|
[1765] | 577 | clear_line();
|
---|
| 578 | printf(HIGHLIGHT"%s", filename);
|
---|
| 579 | if (num_files > 1)
|
---|
| 580 | printf(" (file %i of %i)", current_file, num_files);
|
---|
| 581 | printf(" lines %i-%i/%i ",
|
---|
| 582 | cur_fline + 1, cur_fline + max_displayed_line + 1,
|
---|
| 583 | max_fline + 1);
|
---|
[2725] | 584 | if (cur_fline >= (int)(max_fline - max_displayed_line)) {
|
---|
[1765] | 585 | printf("(END)"NORMAL);
|
---|
| 586 | if (num_files > 1 && current_file != num_files)
|
---|
| 587 | printf(HIGHLIGHT" - next: %s"NORMAL, files[current_file]);
|
---|
| 588 | return;
|
---|
[821] | 589 | }
|
---|
| 590 | percentage = calc_percent();
|
---|
[1765] | 591 | printf("%i%%"NORMAL, percentage);
|
---|
[821] | 592 | }
|
---|
| 593 | #endif
|
---|
| 594 |
|
---|
| 595 | /* Print the status line */
|
---|
| 596 | static void status_print(void)
|
---|
| 597 | {
|
---|
[1765] | 598 | const char *p;
|
---|
| 599 |
|
---|
[2725] | 600 | if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
---|
| 601 | return;
|
---|
| 602 |
|
---|
[821] | 603 | /* Change the status if flags have been set */
|
---|
[1765] | 604 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 605 | if (option_mask32 & (FLAG_M|FLAG_m)) {
|
---|
[821] | 606 | m_status_print();
|
---|
[1765] | 607 | return;
|
---|
| 608 | }
|
---|
[821] | 609 | /* No flags set */
|
---|
| 610 | #endif
|
---|
[1765] | 611 |
|
---|
| 612 | clear_line();
|
---|
[2725] | 613 | if (cur_fline && cur_fline < (int)(max_fline - max_displayed_line)) {
|
---|
| 614 | bb_putchar(':');
|
---|
[1765] | 615 | return;
|
---|
| 616 | }
|
---|
| 617 | p = "(END)";
|
---|
| 618 | if (!cur_fline)
|
---|
| 619 | p = filename;
|
---|
| 620 | if (num_files > 1) {
|
---|
| 621 | printf(HIGHLIGHT"%s (file %i of %i)"NORMAL,
|
---|
| 622 | p, current_file, num_files);
|
---|
| 623 | return;
|
---|
| 624 | }
|
---|
| 625 | print_hilite(p);
|
---|
| 626 | }
|
---|
| 627 |
|
---|
| 628 | static void cap_cur_fline(int nlines)
|
---|
| 629 | {
|
---|
| 630 | int diff;
|
---|
| 631 | if (cur_fline < 0)
|
---|
| 632 | cur_fline = 0;
|
---|
| 633 | if (cur_fline + max_displayed_line > max_fline + TILDES) {
|
---|
| 634 | cur_fline -= nlines;
|
---|
| 635 | if (cur_fline < 0)
|
---|
| 636 | cur_fline = 0;
|
---|
| 637 | diff = max_fline - (cur_fline + max_displayed_line) + TILDES;
|
---|
| 638 | /* As the number of lines requested was too large, we just move
|
---|
[2725] | 639 | * to the end of the file */
|
---|
[1765] | 640 | if (diff > 0)
|
---|
| 641 | cur_fline += diff;
|
---|
| 642 | }
|
---|
| 643 | }
|
---|
| 644 |
|
---|
| 645 | static const char controls[] ALIGN1 =
|
---|
| 646 | /* NUL: never encountered; TAB: not converted */
|
---|
| 647 | /**/"\x01\x02\x03\x04\x05\x06\x07\x08" "\x0a\x0b\x0c\x0d\x0e\x0f"
|
---|
| 648 | "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
|
---|
| 649 | "\x7f\x9b"; /* DEL and infamous Meta-ESC :( */
|
---|
| 650 | static const char ctrlconv[] ALIGN1 =
|
---|
[2725] | 651 | /* why 40 instead of 4a below? - it is a replacement for '\n'.
|
---|
| 652 | * '\n' is a former NUL - we subst it with @, not J */
|
---|
[1765] | 653 | "\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x40\x4b\x4c\x4d\x4e\x4f"
|
---|
| 654 | "\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f";
|
---|
| 655 |
|
---|
[2725] | 656 | static void lineno_str(char *nbuf9, const char *line)
|
---|
| 657 | {
|
---|
| 658 | nbuf9[0] = '\0';
|
---|
| 659 | if (option_mask32 & FLAG_N) {
|
---|
| 660 | const char *fmt;
|
---|
| 661 | unsigned n;
|
---|
| 662 |
|
---|
| 663 | if (line == empty_line_marker) {
|
---|
| 664 | memset(nbuf9, ' ', 8);
|
---|
| 665 | nbuf9[8] = '\0';
|
---|
| 666 | return;
|
---|
| 667 | }
|
---|
| 668 | /* Width of 7 preserves tab spacing in the text */
|
---|
| 669 | fmt = "%7u ";
|
---|
| 670 | n = LINENO(line) + 1;
|
---|
| 671 | if (n > 9999999) {
|
---|
| 672 | n %= 10000000;
|
---|
| 673 | fmt = "%07u ";
|
---|
| 674 | }
|
---|
| 675 | sprintf(nbuf9, fmt, n);
|
---|
| 676 | }
|
---|
| 677 | }
|
---|
| 678 |
|
---|
| 679 |
|
---|
[1765] | 680 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 681 | static void print_found(const char *line)
|
---|
| 682 | {
|
---|
| 683 | int match_status;
|
---|
| 684 | int eflags;
|
---|
| 685 | char *growline;
|
---|
| 686 | regmatch_t match_structs;
|
---|
| 687 |
|
---|
| 688 | char buf[width];
|
---|
[2725] | 689 | char nbuf9[9];
|
---|
[1765] | 690 | const char *str = line;
|
---|
| 691 | char *p = buf;
|
---|
| 692 | size_t n;
|
---|
| 693 |
|
---|
| 694 | while (*str) {
|
---|
| 695 | n = strcspn(str, controls);
|
---|
| 696 | if (n) {
|
---|
| 697 | if (!str[n]) break;
|
---|
| 698 | memcpy(p, str, n);
|
---|
| 699 | p += n;
|
---|
| 700 | str += n;
|
---|
[821] | 701 | }
|
---|
[1765] | 702 | n = strspn(str, controls);
|
---|
| 703 | memset(p, '.', n);
|
---|
| 704 | p += n;
|
---|
| 705 | str += n;
|
---|
| 706 | }
|
---|
| 707 | strcpy(p, str);
|
---|
| 708 |
|
---|
| 709 | /* buf[] holds quarantined version of str */
|
---|
| 710 |
|
---|
| 711 | /* Each part of the line that matches has the HIGHLIGHT
|
---|
[3232] | 712 | * and NORMAL escape sequences placed around it.
|
---|
| 713 | * NB: we regex against line, but insert text
|
---|
| 714 | * from quarantined copy (buf[]) */
|
---|
[1765] | 715 | str = buf;
|
---|
| 716 | growline = NULL;
|
---|
| 717 | eflags = 0;
|
---|
| 718 | goto start;
|
---|
| 719 |
|
---|
| 720 | while (match_status == 0) {
|
---|
| 721 | char *new = xasprintf("%s%.*s"HIGHLIGHT"%.*s"NORMAL,
|
---|
[2725] | 722 | growline ? growline : "",
|
---|
[3232] | 723 | (int)match_structs.rm_so, str,
|
---|
| 724 | (int)(match_structs.rm_eo - match_structs.rm_so),
|
---|
[1765] | 725 | str + match_structs.rm_so);
|
---|
[2725] | 726 | free(growline);
|
---|
| 727 | growline = new;
|
---|
[1765] | 728 | str += match_structs.rm_eo;
|
---|
| 729 | line += match_structs.rm_eo;
|
---|
| 730 | eflags = REG_NOTBOL;
|
---|
| 731 | start:
|
---|
| 732 | /* Most of the time doesn't find the regex, optimize for that */
|
---|
| 733 | match_status = regexec(&pattern, line, 1, &match_structs, eflags);
|
---|
[2725] | 734 | /* if even "" matches, treat it as "not a match" */
|
---|
| 735 | if (match_structs.rm_so >= match_structs.rm_eo)
|
---|
| 736 | match_status = 1;
|
---|
[1765] | 737 | }
|
---|
| 738 |
|
---|
[2725] | 739 | lineno_str(nbuf9, line);
|
---|
[1765] | 740 | if (!growline) {
|
---|
[2725] | 741 | printf(CLEAR_2_EOL"%s%s\n", nbuf9, str);
|
---|
[1765] | 742 | return;
|
---|
| 743 | }
|
---|
[2725] | 744 | printf(CLEAR_2_EOL"%s%s%s\n", nbuf9, growline, str);
|
---|
[1765] | 745 | free(growline);
|
---|
| 746 | }
|
---|
| 747 | #else
|
---|
| 748 | void print_found(const char *line);
|
---|
| 749 | #endif
|
---|
| 750 |
|
---|
| 751 | static void print_ascii(const char *str)
|
---|
| 752 | {
|
---|
| 753 | char buf[width];
|
---|
[2725] | 754 | char nbuf9[9];
|
---|
[1765] | 755 | char *p;
|
---|
| 756 | size_t n;
|
---|
| 757 |
|
---|
[2725] | 758 | lineno_str(nbuf9, str);
|
---|
| 759 | printf(CLEAR_2_EOL"%s", nbuf9);
|
---|
| 760 |
|
---|
[1765] | 761 | while (*str) {
|
---|
| 762 | n = strcspn(str, controls);
|
---|
| 763 | if (n) {
|
---|
| 764 | if (!str[n]) break;
|
---|
| 765 | printf("%.*s", (int) n, str);
|
---|
| 766 | str += n;
|
---|
[821] | 767 | }
|
---|
[1765] | 768 | n = strspn(str, controls);
|
---|
| 769 | p = buf;
|
---|
| 770 | do {
|
---|
| 771 | if (*str == 0x7f)
|
---|
| 772 | *p++ = '?';
|
---|
| 773 | else if (*str == (char)0x9b)
|
---|
| 774 | /* VT100's CSI, aka Meta-ESC. Who's inventor? */
|
---|
| 775 | /* I want to know who committed this sin */
|
---|
| 776 | *p++ = '{';
|
---|
| 777 | else
|
---|
| 778 | *p++ = ctrlconv[(unsigned char)*str];
|
---|
| 779 | str++;
|
---|
| 780 | } while (--n);
|
---|
| 781 | *p = '\0';
|
---|
| 782 | print_hilite(buf);
|
---|
[821] | 783 | }
|
---|
[1765] | 784 | puts(str);
|
---|
[821] | 785 | }
|
---|
| 786 |
|
---|
| 787 | /* Print the buffer */
|
---|
| 788 | static void buffer_print(void)
|
---|
| 789 | {
|
---|
[2725] | 790 | unsigned i;
|
---|
[821] | 791 |
|
---|
[1765] | 792 | move_cursor(0, 0);
|
---|
| 793 | for (i = 0; i <= max_displayed_line; i++)
|
---|
| 794 | if (pattern_valid)
|
---|
| 795 | print_found(buffer[i]);
|
---|
| 796 | else
|
---|
| 797 | print_ascii(buffer[i]);
|
---|
[821] | 798 | status_print();
|
---|
| 799 | }
|
---|
| 800 |
|
---|
[1765] | 801 | static void buffer_fill_and_print(void)
|
---|
[821] | 802 | {
|
---|
[2725] | 803 | unsigned i;
|
---|
| 804 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
| 805 | int fpos = cur_fline;
|
---|
| 806 |
|
---|
| 807 | if (option_mask32 & FLAG_S) {
|
---|
| 808 | /* Go back to the beginning of this line */
|
---|
| 809 | while (fpos && LINENO(flines[fpos]) == LINENO(flines[fpos-1]))
|
---|
| 810 | fpos--;
|
---|
| 811 | }
|
---|
| 812 |
|
---|
| 813 | i = 0;
|
---|
| 814 | while (i <= max_displayed_line && fpos <= max_fline) {
|
---|
| 815 | int lineno = LINENO(flines[fpos]);
|
---|
| 816 | buffer[i] = flines[fpos];
|
---|
| 817 | i++;
|
---|
| 818 | do {
|
---|
| 819 | fpos++;
|
---|
| 820 | } while ((fpos <= max_fline)
|
---|
| 821 | && (option_mask32 & FLAG_S)
|
---|
| 822 | && lineno == LINENO(flines[fpos])
|
---|
| 823 | );
|
---|
| 824 | }
|
---|
| 825 | #else
|
---|
[1765] | 826 | for (i = 0; i <= max_displayed_line && cur_fline + i <= max_fline; i++) {
|
---|
| 827 | buffer[i] = flines[cur_fline + i];
|
---|
[821] | 828 | }
|
---|
[2725] | 829 | #endif
|
---|
[1765] | 830 | for (; i <= max_displayed_line; i++) {
|
---|
| 831 | buffer[i] = empty_line_marker;
|
---|
[821] | 832 | }
|
---|
[1765] | 833 | buffer_print();
|
---|
[821] | 834 | }
|
---|
| 835 |
|
---|
| 836 | /* Move the buffer up and down in the file in order to scroll */
|
---|
| 837 | static void buffer_down(int nlines)
|
---|
| 838 | {
|
---|
[1765] | 839 | cur_fline += nlines;
|
---|
| 840 | read_lines();
|
---|
| 841 | cap_cur_fline(nlines);
|
---|
| 842 | buffer_fill_and_print();
|
---|
| 843 | }
|
---|
[821] | 844 |
|
---|
[1765] | 845 | static void buffer_up(int nlines)
|
---|
| 846 | {
|
---|
| 847 | cur_fline -= nlines;
|
---|
| 848 | if (cur_fline < 0) cur_fline = 0;
|
---|
| 849 | read_lines();
|
---|
| 850 | buffer_fill_and_print();
|
---|
| 851 | }
|
---|
[821] | 852 |
|
---|
[1765] | 853 | static void buffer_line(int linenum)
|
---|
| 854 | {
|
---|
| 855 | if (linenum < 0)
|
---|
| 856 | linenum = 0;
|
---|
| 857 | cur_fline = linenum;
|
---|
| 858 | read_lines();
|
---|
| 859 | if (linenum + max_displayed_line > max_fline)
|
---|
| 860 | linenum = max_fline - max_displayed_line + TILDES;
|
---|
| 861 | if (linenum < 0)
|
---|
| 862 | linenum = 0;
|
---|
| 863 | cur_fline = linenum;
|
---|
| 864 | buffer_fill_and_print();
|
---|
| 865 | }
|
---|
| 866 |
|
---|
| 867 | static void open_file_and_read_lines(void)
|
---|
| 868 | {
|
---|
| 869 | if (filename) {
|
---|
[2725] | 870 | xmove_fd(xopen(filename, O_RDONLY), STDIN_FILENO);
|
---|
[1765] | 871 | } else {
|
---|
| 872 | /* "less" with no arguments in argv[] */
|
---|
| 873 | /* For status line only */
|
---|
| 874 | filename = xstrdup(bb_msg_standard_input);
|
---|
[821] | 875 | }
|
---|
[1765] | 876 | readpos = 0;
|
---|
| 877 | readeof = 0;
|
---|
[2725] | 878 | last_line_pos = 0;
|
---|
[1765] | 879 | terminated = 1;
|
---|
| 880 | read_lines();
|
---|
[821] | 881 | }
|
---|
| 882 |
|
---|
[1765] | 883 | /* Reinitialize everything for a new file - free the memory and start over */
|
---|
| 884 | static void reinitialize(void)
|
---|
[821] | 885 | {
|
---|
[2725] | 886 | unsigned i;
|
---|
[821] | 887 |
|
---|
[1765] | 888 | if (flines) {
|
---|
| 889 | for (i = 0; i <= max_fline; i++)
|
---|
[2725] | 890 | free(MEMPTR(flines[i]));
|
---|
[1765] | 891 | free(flines);
|
---|
| 892 | flines = NULL;
|
---|
[821] | 893 | }
|
---|
| 894 |
|
---|
[1765] | 895 | max_fline = -1;
|
---|
| 896 | cur_fline = 0;
|
---|
| 897 | max_lineno = 0;
|
---|
| 898 | open_file_and_read_lines();
|
---|
[3232] | 899 | #if ENABLE_FEATURE_LESS_ASK_TERMINAL
|
---|
| 900 | if (G.winsize_err)
|
---|
| 901 | printf("\033[999;999H" "\033[6n");
|
---|
| 902 | #endif
|
---|
[1765] | 903 | buffer_fill_and_print();
|
---|
[821] | 904 | }
|
---|
| 905 |
|
---|
[3232] | 906 | static int64_t getch_nowait(void)
|
---|
[821] | 907 | {
|
---|
[2725] | 908 | int rd;
|
---|
[3232] | 909 | int64_t key64;
|
---|
[2725] | 910 | struct pollfd pfd[2];
|
---|
| 911 |
|
---|
| 912 | pfd[0].fd = STDIN_FILENO;
|
---|
| 913 | pfd[0].events = POLLIN;
|
---|
| 914 | pfd[1].fd = kbd_fd;
|
---|
| 915 | pfd[1].events = POLLIN;
|
---|
[1765] | 916 | again:
|
---|
[2725] | 917 | tcsetattr(kbd_fd, TCSANOW, &term_less);
|
---|
| 918 | /* NB: select/poll returns whenever read will not block. Therefore:
|
---|
| 919 | * if eof is reached, select/poll will return immediately
|
---|
| 920 | * because read will immediately return 0 bytes.
|
---|
| 921 | * Even if select/poll says that input is available, read CAN block
|
---|
[1765] | 922 | * (switch fd into O_NONBLOCK'ed mode to avoid it)
|
---|
| 923 | */
|
---|
[2725] | 924 | rd = 1;
|
---|
| 925 | /* Are we interested in stdin? */
|
---|
| 926 | //TODO: reuse code for determining this
|
---|
| 927 | if (!(option_mask32 & FLAG_S)
|
---|
| 928 | ? !(max_fline > cur_fline + max_displayed_line)
|
---|
| 929 | : !(max_fline >= cur_fline
|
---|
| 930 | && max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
|
---|
[1765] | 931 | ) {
|
---|
[2725] | 932 | if (eof_error > 0) /* did NOT reach eof yet */
|
---|
| 933 | rd = 0; /* yes, we are interested in stdin */
|
---|
[821] | 934 | }
|
---|
[2725] | 935 | /* Position cursor if line input is done */
|
---|
| 936 | if (less_gets_pos >= 0)
|
---|
| 937 | move_cursor(max_displayed_line + 2, less_gets_pos + 1);
|
---|
| 938 | fflush_all();
|
---|
[1765] | 939 |
|
---|
[2725] | 940 | if (kbd_input[0] == 0) { /* if nothing is buffered */
|
---|
| 941 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 942 | while (1) {
|
---|
| 943 | int r;
|
---|
| 944 | /* NB: SIGWINCH interrupts poll() */
|
---|
| 945 | r = poll(pfd + rd, 2 - rd, -1);
|
---|
| 946 | if (/*r < 0 && errno == EINTR &&*/ winch_counter)
|
---|
| 947 | return '\\'; /* anything which has no defined function */
|
---|
| 948 | if (r) break;
|
---|
| 949 | }
|
---|
| 950 | #else
|
---|
| 951 | safe_poll(pfd + rd, 2 - rd, -1);
|
---|
| 952 | #endif
|
---|
[821] | 953 | }
|
---|
[2725] | 954 |
|
---|
| 955 | /* We have kbd_fd in O_NONBLOCK mode, read inside read_key()
|
---|
| 956 | * would not block even if there is no input available */
|
---|
[3232] | 957 | key64 = read_key(kbd_fd, kbd_input, /*timeout off:*/ -2);
|
---|
| 958 | if ((int)key64 == -1) {
|
---|
[2725] | 959 | if (errno == EAGAIN) {
|
---|
| 960 | /* No keyboard input available. Since poll() did return,
|
---|
| 961 | * we should have input on stdin */
|
---|
| 962 | read_lines();
|
---|
| 963 | buffer_fill_and_print();
|
---|
| 964 | goto again;
|
---|
| 965 | }
|
---|
| 966 | /* EOF/error (ssh session got killed etc) */
|
---|
| 967 | less_exit(0);
|
---|
| 968 | }
|
---|
| 969 | set_tty_cooked();
|
---|
[3232] | 970 | return key64;
|
---|
[1765] | 971 | }
|
---|
| 972 |
|
---|
[2725] | 973 | /* Grab a character from input without requiring the return key.
|
---|
| 974 | * May return KEYCODE_xxx values.
|
---|
| 975 | * Note that this function works best with raw input. */
|
---|
[3232] | 976 | static int64_t less_getch(int pos)
|
---|
[1765] | 977 | {
|
---|
[3232] | 978 | int64_t key64;
|
---|
| 979 | int key;
|
---|
[2725] | 980 |
|
---|
[1765] | 981 | again:
|
---|
[2725] | 982 | less_gets_pos = pos;
|
---|
[3232] | 983 | key = key64 = getch_nowait();
|
---|
[2725] | 984 | less_gets_pos = -1;
|
---|
[1765] | 985 |
|
---|
[3232] | 986 | /* Discard Ctrl-something chars.
|
---|
| 987 | * (checking only lower 32 bits is a size optimization:
|
---|
| 988 | * upper 32 bits are used only by KEYCODE_CURSOR_POS)
|
---|
| 989 | */
|
---|
| 990 | if (key >= 0 && key < ' ' && key != 0x0d && key != 8)
|
---|
[2725] | 991 | goto again;
|
---|
[3232] | 992 |
|
---|
| 993 | return key64;
|
---|
[821] | 994 | }
|
---|
| 995 |
|
---|
[1765] | 996 | static char* less_gets(int sz)
|
---|
[821] | 997 | {
|
---|
[2725] | 998 | int c;
|
---|
| 999 | unsigned i = 0;
|
---|
[1765] | 1000 | char *result = xzalloc(1);
|
---|
[2725] | 1001 |
|
---|
[1765] | 1002 | while (1) {
|
---|
| 1003 | c = '\0';
|
---|
[2725] | 1004 | less_gets_pos = sz + i;
|
---|
| 1005 | c = getch_nowait();
|
---|
| 1006 | if (c == 0x0d) {
|
---|
| 1007 | result[i] = '\0';
|
---|
| 1008 | less_gets_pos = -1;
|
---|
[1765] | 1009 | return result;
|
---|
[2725] | 1010 | }
|
---|
[1765] | 1011 | if (c == 0x7f)
|
---|
| 1012 | c = 8;
|
---|
| 1013 | if (c == 8 && i) {
|
---|
| 1014 | printf("\x8 \x8");
|
---|
| 1015 | i--;
|
---|
| 1016 | }
|
---|
[2725] | 1017 | if (c < ' ') /* filters out KEYCODE_xxx too (<0) */
|
---|
[1765] | 1018 | continue;
|
---|
| 1019 | if (i >= width - sz - 1)
|
---|
| 1020 | continue; /* len limit */
|
---|
[2725] | 1021 | bb_putchar(c);
|
---|
[1765] | 1022 | result[i++] = c;
|
---|
| 1023 | result = xrealloc(result, i+1);
|
---|
| 1024 | }
|
---|
[821] | 1025 | }
|
---|
| 1026 |
|
---|
| 1027 | static void examine_file(void)
|
---|
| 1028 | {
|
---|
[2725] | 1029 | char *new_fname;
|
---|
| 1030 |
|
---|
[1765] | 1031 | print_statusline("Examine: ");
|
---|
[2725] | 1032 | new_fname = less_gets(sizeof("Examine: ") - 1);
|
---|
| 1033 | if (!new_fname[0]) {
|
---|
| 1034 | status_print();
|
---|
| 1035 | err:
|
---|
| 1036 | free(new_fname);
|
---|
| 1037 | return;
|
---|
| 1038 | }
|
---|
| 1039 | if (access(new_fname, R_OK) != 0) {
|
---|
| 1040 | print_statusline("Cannot read this file");
|
---|
| 1041 | goto err;
|
---|
| 1042 | }
|
---|
[1765] | 1043 | free(filename);
|
---|
[2725] | 1044 | filename = new_fname;
|
---|
[1765] | 1045 | /* files start by = argv. why we assume that argv is infinitely long??
|
---|
| 1046 | files[num_files] = filename;
|
---|
[821] | 1047 | current_file = num_files + 1;
|
---|
[1765] | 1048 | num_files++; */
|
---|
| 1049 | files[0] = filename;
|
---|
| 1050 | num_files = current_file = 1;
|
---|
| 1051 | reinitialize();
|
---|
[821] | 1052 | }
|
---|
| 1053 |
|
---|
| 1054 | /* This function changes the file currently being paged. direction can be one of the following:
|
---|
| 1055 | * -1: go back one file
|
---|
| 1056 | * 0: go to the first file
|
---|
[1765] | 1057 | * 1: go forward one file */
|
---|
[821] | 1058 | static void change_file(int direction)
|
---|
| 1059 | {
|
---|
| 1060 | if (current_file != ((direction > 0) ? num_files : 1)) {
|
---|
| 1061 | current_file = direction ? current_file + direction : 1;
|
---|
[1765] | 1062 | free(filename);
|
---|
| 1063 | filename = xstrdup(files[current_file - 1]);
|
---|
| 1064 | reinitialize();
|
---|
| 1065 | } else {
|
---|
| 1066 | print_statusline(direction > 0 ? "No next file" : "No previous file");
|
---|
[821] | 1067 | }
|
---|
| 1068 | }
|
---|
| 1069 |
|
---|
| 1070 | static void remove_current_file(void)
|
---|
| 1071 | {
|
---|
[2725] | 1072 | unsigned i;
|
---|
[821] | 1073 |
|
---|
[1765] | 1074 | if (num_files < 2)
|
---|
| 1075 | return;
|
---|
| 1076 |
|
---|
[821] | 1077 | if (current_file != 1) {
|
---|
| 1078 | change_file(-1);
|
---|
| 1079 | for (i = 3; i <= num_files; i++)
|
---|
| 1080 | files[i - 2] = files[i - 1];
|
---|
| 1081 | num_files--;
|
---|
[1765] | 1082 | } else {
|
---|
[821] | 1083 | change_file(1);
|
---|
| 1084 | for (i = 2; i <= num_files; i++)
|
---|
| 1085 | files[i - 2] = files[i - 1];
|
---|
| 1086 | num_files--;
|
---|
| 1087 | current_file--;
|
---|
| 1088 | }
|
---|
| 1089 | }
|
---|
| 1090 |
|
---|
| 1091 | static void colon_process(void)
|
---|
| 1092 | {
|
---|
| 1093 | int keypress;
|
---|
| 1094 |
|
---|
| 1095 | /* Clear the current line and print a prompt */
|
---|
[1765] | 1096 | print_statusline(" :");
|
---|
[821] | 1097 |
|
---|
[2725] | 1098 | keypress = less_getch(2);
|
---|
[821] | 1099 | switch (keypress) {
|
---|
[1765] | 1100 | case 'd':
|
---|
| 1101 | remove_current_file();
|
---|
| 1102 | break;
|
---|
| 1103 | case 'e':
|
---|
| 1104 | examine_file();
|
---|
| 1105 | break;
|
---|
| 1106 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1107 | case 'f':
|
---|
| 1108 | m_status_print();
|
---|
| 1109 | break;
|
---|
[821] | 1110 | #endif
|
---|
[1765] | 1111 | case 'n':
|
---|
| 1112 | change_file(1);
|
---|
| 1113 | break;
|
---|
| 1114 | case 'p':
|
---|
| 1115 | change_file(-1);
|
---|
| 1116 | break;
|
---|
| 1117 | case 'q':
|
---|
[2725] | 1118 | less_exit(EXIT_SUCCESS);
|
---|
[1765] | 1119 | break;
|
---|
| 1120 | case 'x':
|
---|
| 1121 | change_file(0);
|
---|
| 1122 | break;
|
---|
[821] | 1123 | }
|
---|
| 1124 | }
|
---|
| 1125 |
|
---|
[1765] | 1126 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1127 | static void normalize_match_pos(int match)
|
---|
| 1128 | {
|
---|
| 1129 | if (match >= num_matches)
|
---|
| 1130 | match = num_matches - 1;
|
---|
| 1131 | if (match < 0)
|
---|
| 1132 | match = 0;
|
---|
| 1133 | match_pos = match;
|
---|
| 1134 | }
|
---|
[821] | 1135 |
|
---|
[1765] | 1136 | static void goto_match(int match)
|
---|
[821] | 1137 | {
|
---|
[1765] | 1138 | if (!pattern_valid)
|
---|
| 1139 | return;
|
---|
| 1140 | if (match < 0)
|
---|
| 1141 | match = 0;
|
---|
| 1142 | /* Try to find next match if eof isn't reached yet */
|
---|
| 1143 | if (match >= num_matches && eof_error > 0) {
|
---|
[2725] | 1144 | wanted_match = match; /* "I want to read until I see N'th match" */
|
---|
[1765] | 1145 | read_lines();
|
---|
[821] | 1146 | }
|
---|
[1765] | 1147 | if (num_matches) {
|
---|
| 1148 | normalize_match_pos(match);
|
---|
| 1149 | buffer_line(match_lines[match_pos]);
|
---|
| 1150 | } else {
|
---|
| 1151 | print_statusline("No matches found");
|
---|
| 1152 | }
|
---|
[821] | 1153 | }
|
---|
| 1154 |
|
---|
[1765] | 1155 | static void fill_match_lines(unsigned pos)
|
---|
[821] | 1156 | {
|
---|
[1765] | 1157 | if (!pattern_valid)
|
---|
| 1158 | return;
|
---|
| 1159 | /* Run the regex on each line of the current file */
|
---|
| 1160 | while (pos <= max_fline) {
|
---|
| 1161 | /* If this line matches */
|
---|
| 1162 | if (regexec(&pattern, flines[pos], 0, NULL, 0) == 0
|
---|
| 1163 | /* and we didn't match it last time */
|
---|
| 1164 | && !(num_matches && match_lines[num_matches-1] == pos)
|
---|
| 1165 | ) {
|
---|
[2725] | 1166 | match_lines = xrealloc_vector(match_lines, 4, num_matches);
|
---|
[1765] | 1167 | match_lines[num_matches++] = pos;
|
---|
| 1168 | }
|
---|
| 1169 | pos++;
|
---|
[821] | 1170 | }
|
---|
| 1171 | }
|
---|
| 1172 |
|
---|
| 1173 | static void regex_process(void)
|
---|
| 1174 | {
|
---|
[1765] | 1175 | char *uncomp_regex, *err;
|
---|
| 1176 |
|
---|
| 1177 | /* Reset variables */
|
---|
| 1178 | free(match_lines);
|
---|
| 1179 | match_lines = NULL;
|
---|
| 1180 | match_pos = 0;
|
---|
| 1181 | num_matches = 0;
|
---|
| 1182 | if (pattern_valid) {
|
---|
| 1183 | regfree(&pattern);
|
---|
| 1184 | pattern_valid = 0;
|
---|
| 1185 | }
|
---|
| 1186 |
|
---|
[821] | 1187 | /* Get the uncompiled regular expression from the user */
|
---|
| 1188 | clear_line();
|
---|
[2725] | 1189 | bb_putchar((option_mask32 & LESS_STATE_MATCH_BACKWARDS) ? '?' : '/');
|
---|
[1765] | 1190 | uncomp_regex = less_gets(1);
|
---|
| 1191 | if (!uncomp_regex[0]) {
|
---|
| 1192 | free(uncomp_regex);
|
---|
| 1193 | buffer_print();
|
---|
[821] | 1194 | return;
|
---|
| 1195 | }
|
---|
[1765] | 1196 |
|
---|
[821] | 1197 | /* Compile the regex and check for errors */
|
---|
[2725] | 1198 | err = regcomp_or_errmsg(&pattern, uncomp_regex,
|
---|
| 1199 | (option_mask32 & FLAG_I) ? REG_ICASE : 0);
|
---|
[1765] | 1200 | free(uncomp_regex);
|
---|
| 1201 | if (err) {
|
---|
| 1202 | print_statusline(err);
|
---|
| 1203 | free(err);
|
---|
| 1204 | return;
|
---|
| 1205 | }
|
---|
[821] | 1206 |
|
---|
[1765] | 1207 | pattern_valid = 1;
|
---|
[821] | 1208 | match_pos = 0;
|
---|
[1765] | 1209 | fill_match_lines(0);
|
---|
| 1210 | while (match_pos < num_matches) {
|
---|
[2725] | 1211 | if ((int)match_lines[match_pos] > cur_fline)
|
---|
[1765] | 1212 | break;
|
---|
| 1213 | match_pos++;
|
---|
[821] | 1214 | }
|
---|
[1765] | 1215 | if (option_mask32 & LESS_STATE_MATCH_BACKWARDS)
|
---|
| 1216 | match_pos--;
|
---|
| 1217 |
|
---|
| 1218 | /* It's possible that no matches are found yet.
|
---|
| 1219 | * goto_match() will read input looking for match,
|
---|
| 1220 | * if needed */
|
---|
| 1221 | goto_match(match_pos);
|
---|
[821] | 1222 | }
|
---|
| 1223 | #endif
|
---|
| 1224 |
|
---|
| 1225 | static void number_process(int first_digit)
|
---|
| 1226 | {
|
---|
[2725] | 1227 | unsigned i;
|
---|
[821] | 1228 | int num;
|
---|
[2725] | 1229 | int keypress;
|
---|
[1765] | 1230 | char num_input[sizeof(int)*4]; /* more than enough */
|
---|
[821] | 1231 |
|
---|
| 1232 | num_input[0] = first_digit;
|
---|
| 1233 |
|
---|
| 1234 | /* Clear the current line, print a prompt, and then print the digit */
|
---|
| 1235 | clear_line();
|
---|
| 1236 | printf(":%c", first_digit);
|
---|
| 1237 |
|
---|
[1765] | 1238 | /* Receive input until a letter is given */
|
---|
[2725] | 1239 | i = 1;
|
---|
[1765] | 1240 | while (i < sizeof(num_input)-1) {
|
---|
[2725] | 1241 | keypress = less_getch(i + 1);
|
---|
| 1242 | if ((unsigned)keypress > 255 || !isdigit(num_input[i]))
|
---|
[1765] | 1243 | break;
|
---|
[2725] | 1244 | num_input[i] = keypress;
|
---|
| 1245 | bb_putchar(keypress);
|
---|
[821] | 1246 | i++;
|
---|
| 1247 | }
|
---|
| 1248 |
|
---|
| 1249 | num_input[i] = '\0';
|
---|
[1765] | 1250 | num = bb_strtou(num_input, NULL, 10);
|
---|
| 1251 | /* on format error, num == -1 */
|
---|
| 1252 | if (num < 1 || num > MAXLINES) {
|
---|
[821] | 1253 | buffer_print();
|
---|
| 1254 | return;
|
---|
| 1255 | }
|
---|
| 1256 |
|
---|
| 1257 | /* We now know the number and the letter entered, so we process them */
|
---|
| 1258 | switch (keypress) {
|
---|
[2725] | 1259 | case KEYCODE_DOWN: case 'z': case 'd': case 'e': case ' ': case '\015':
|
---|
[1765] | 1260 | buffer_down(num);
|
---|
| 1261 | break;
|
---|
[2725] | 1262 | case KEYCODE_UP: case 'b': case 'w': case 'y': case 'u':
|
---|
[1765] | 1263 | buffer_up(num);
|
---|
| 1264 | break;
|
---|
| 1265 | case 'g': case '<': case 'G': case '>':
|
---|
| 1266 | cur_fline = num + max_displayed_line;
|
---|
| 1267 | read_lines();
|
---|
| 1268 | buffer_line(num - 1);
|
---|
| 1269 | break;
|
---|
| 1270 | case 'p': case '%':
|
---|
| 1271 | num = num * (max_fline / 100); /* + max_fline / 2; */
|
---|
| 1272 | cur_fline = num + max_displayed_line;
|
---|
| 1273 | read_lines();
|
---|
| 1274 | buffer_line(num);
|
---|
| 1275 | break;
|
---|
| 1276 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1277 | case 'n':
|
---|
| 1278 | goto_match(match_pos + num);
|
---|
| 1279 | break;
|
---|
| 1280 | case '/':
|
---|
| 1281 | option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1282 | regex_process();
|
---|
| 1283 | break;
|
---|
| 1284 | case '?':
|
---|
| 1285 | option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1286 | regex_process();
|
---|
| 1287 | break;
|
---|
[821] | 1288 | #endif
|
---|
| 1289 | }
|
---|
| 1290 | }
|
---|
| 1291 |
|
---|
[2725] | 1292 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
[821] | 1293 | static void flag_change(void)
|
---|
| 1294 | {
|
---|
| 1295 | int keypress;
|
---|
| 1296 |
|
---|
| 1297 | clear_line();
|
---|
[2725] | 1298 | bb_putchar('-');
|
---|
| 1299 | keypress = less_getch(1);
|
---|
[821] | 1300 |
|
---|
| 1301 | switch (keypress) {
|
---|
[1765] | 1302 | case 'M':
|
---|
| 1303 | option_mask32 ^= FLAG_M;
|
---|
| 1304 | break;
|
---|
| 1305 | case 'm':
|
---|
| 1306 | option_mask32 ^= FLAG_m;
|
---|
| 1307 | break;
|
---|
| 1308 | case 'E':
|
---|
| 1309 | option_mask32 ^= FLAG_E;
|
---|
| 1310 | break;
|
---|
| 1311 | case '~':
|
---|
| 1312 | option_mask32 ^= FLAG_TILDE;
|
---|
| 1313 | break;
|
---|
[2725] | 1314 | case 'S':
|
---|
| 1315 | option_mask32 ^= FLAG_S;
|
---|
| 1316 | buffer_fill_and_print();
|
---|
| 1317 | break;
|
---|
| 1318 | #if ENABLE_FEATURE_LESS_LINENUMS
|
---|
| 1319 | case 'N':
|
---|
| 1320 | option_mask32 ^= FLAG_N;
|
---|
| 1321 | re_wrap();
|
---|
| 1322 | buffer_fill_and_print();
|
---|
| 1323 | break;
|
---|
| 1324 | #endif
|
---|
[821] | 1325 | }
|
---|
| 1326 | }
|
---|
| 1327 |
|
---|
[2725] | 1328 | #ifdef BLOAT
|
---|
[821] | 1329 | static void show_flag_status(void)
|
---|
| 1330 | {
|
---|
| 1331 | int keypress;
|
---|
| 1332 | int flag_val;
|
---|
| 1333 |
|
---|
| 1334 | clear_line();
|
---|
[2725] | 1335 | bb_putchar('_');
|
---|
| 1336 | keypress = less_getch(1);
|
---|
[821] | 1337 |
|
---|
| 1338 | switch (keypress) {
|
---|
[1765] | 1339 | case 'M':
|
---|
| 1340 | flag_val = option_mask32 & FLAG_M;
|
---|
| 1341 | break;
|
---|
| 1342 | case 'm':
|
---|
| 1343 | flag_val = option_mask32 & FLAG_m;
|
---|
| 1344 | break;
|
---|
| 1345 | case '~':
|
---|
| 1346 | flag_val = option_mask32 & FLAG_TILDE;
|
---|
| 1347 | break;
|
---|
| 1348 | case 'N':
|
---|
| 1349 | flag_val = option_mask32 & FLAG_N;
|
---|
| 1350 | break;
|
---|
| 1351 | case 'E':
|
---|
| 1352 | flag_val = option_mask32 & FLAG_E;
|
---|
| 1353 | break;
|
---|
| 1354 | default:
|
---|
| 1355 | flag_val = 0;
|
---|
| 1356 | break;
|
---|
[821] | 1357 | }
|
---|
| 1358 |
|
---|
| 1359 | clear_line();
|
---|
[1765] | 1360 | printf(HIGHLIGHT"The status of the flag is: %u"NORMAL, flag_val != 0);
|
---|
[821] | 1361 | }
|
---|
| 1362 | #endif
|
---|
| 1363 |
|
---|
[2725] | 1364 | #endif /* ENABLE_FEATURE_LESS_DASHCMD */
|
---|
| 1365 |
|
---|
[821] | 1366 | static void save_input_to_file(void)
|
---|
| 1367 | {
|
---|
[1765] | 1368 | const char *msg = "";
|
---|
| 1369 | char *current_line;
|
---|
[2725] | 1370 | unsigned i;
|
---|
[821] | 1371 | FILE *fp;
|
---|
| 1372 |
|
---|
[1765] | 1373 | print_statusline("Log file: ");
|
---|
| 1374 | current_line = less_gets(sizeof("Log file: ")-1);
|
---|
[2725] | 1375 | if (current_line[0]) {
|
---|
| 1376 | fp = fopen_for_write(current_line);
|
---|
[1765] | 1377 | if (!fp) {
|
---|
| 1378 | msg = "Error opening log file";
|
---|
| 1379 | goto ret;
|
---|
| 1380 | }
|
---|
| 1381 | for (i = 0; i <= max_fline; i++)
|
---|
| 1382 | fprintf(fp, "%s\n", flines[i]);
|
---|
[821] | 1383 | fclose(fp);
|
---|
[1765] | 1384 | msg = "Done";
|
---|
[821] | 1385 | }
|
---|
[1765] | 1386 | ret:
|
---|
| 1387 | print_statusline(msg);
|
---|
| 1388 | free(current_line);
|
---|
[821] | 1389 | }
|
---|
| 1390 |
|
---|
[1765] | 1391 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
[821] | 1392 | static void add_mark(void)
|
---|
| 1393 | {
|
---|
| 1394 | int letter;
|
---|
| 1395 |
|
---|
[1765] | 1396 | print_statusline("Mark: ");
|
---|
[2725] | 1397 | letter = less_getch(sizeof("Mark: ") - 1);
|
---|
[821] | 1398 |
|
---|
| 1399 | if (isalpha(letter)) {
|
---|
| 1400 | /* If we exceed 15 marks, start overwriting previous ones */
|
---|
| 1401 | if (num_marks == 14)
|
---|
| 1402 | num_marks = 0;
|
---|
| 1403 |
|
---|
| 1404 | mark_lines[num_marks][0] = letter;
|
---|
[1765] | 1405 | mark_lines[num_marks][1] = cur_fline;
|
---|
[821] | 1406 | num_marks++;
|
---|
[1765] | 1407 | } else {
|
---|
| 1408 | print_statusline("Invalid mark letter");
|
---|
[821] | 1409 | }
|
---|
| 1410 | }
|
---|
| 1411 |
|
---|
| 1412 | static void goto_mark(void)
|
---|
| 1413 | {
|
---|
| 1414 | int letter;
|
---|
| 1415 | int i;
|
---|
| 1416 |
|
---|
[1765] | 1417 | print_statusline("Go to mark: ");
|
---|
[2725] | 1418 | letter = less_getch(sizeof("Go to mark: ") - 1);
|
---|
[821] | 1419 | clear_line();
|
---|
| 1420 |
|
---|
| 1421 | if (isalpha(letter)) {
|
---|
| 1422 | for (i = 0; i <= num_marks; i++)
|
---|
| 1423 | if (letter == mark_lines[i][0]) {
|
---|
| 1424 | buffer_line(mark_lines[i][1]);
|
---|
| 1425 | break;
|
---|
| 1426 | }
|
---|
[1765] | 1427 | if (num_marks == 14 && letter != mark_lines[14][0])
|
---|
| 1428 | print_statusline("Mark not set");
|
---|
| 1429 | } else
|
---|
| 1430 | print_statusline("Invalid mark letter");
|
---|
[821] | 1431 | }
|
---|
| 1432 | #endif
|
---|
| 1433 |
|
---|
[1765] | 1434 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
[821] | 1435 | static char opp_bracket(char bracket)
|
---|
| 1436 | {
|
---|
| 1437 | switch (bracket) {
|
---|
[2725] | 1438 | case '{': case '[': /* '}' == '{' + 2. Same for '[' */
|
---|
| 1439 | bracket++;
|
---|
| 1440 | case '(': /* ')' == '(' + 1 */
|
---|
| 1441 | bracket++;
|
---|
| 1442 | break;
|
---|
| 1443 | case '}': case ']':
|
---|
| 1444 | bracket--;
|
---|
| 1445 | case ')':
|
---|
| 1446 | bracket--;
|
---|
| 1447 | break;
|
---|
| 1448 | };
|
---|
| 1449 | return bracket;
|
---|
[821] | 1450 | }
|
---|
| 1451 |
|
---|
| 1452 | static void match_right_bracket(char bracket)
|
---|
| 1453 | {
|
---|
[2725] | 1454 | unsigned i;
|
---|
[821] | 1455 |
|
---|
[1765] | 1456 | if (strchr(flines[cur_fline], bracket) == NULL) {
|
---|
| 1457 | print_statusline("No bracket in top line");
|
---|
| 1458 | return;
|
---|
| 1459 | }
|
---|
[2725] | 1460 | bracket = opp_bracket(bracket);
|
---|
[1765] | 1461 | for (i = cur_fline + 1; i < max_fline; i++) {
|
---|
[2725] | 1462 | if (strchr(flines[i], bracket) != NULL) {
|
---|
| 1463 | buffer_line(i);
|
---|
| 1464 | return;
|
---|
[821] | 1465 | }
|
---|
| 1466 | }
|
---|
[2725] | 1467 | print_statusline("No matching bracket found");
|
---|
[821] | 1468 | }
|
---|
| 1469 |
|
---|
| 1470 | static void match_left_bracket(char bracket)
|
---|
| 1471 | {
|
---|
| 1472 | int i;
|
---|
| 1473 |
|
---|
[1765] | 1474 | if (strchr(flines[cur_fline + max_displayed_line], bracket) == NULL) {
|
---|
| 1475 | print_statusline("No bracket in bottom line");
|
---|
| 1476 | return;
|
---|
| 1477 | }
|
---|
[821] | 1478 |
|
---|
[2725] | 1479 | bracket = opp_bracket(bracket);
|
---|
[1765] | 1480 | for (i = cur_fline + max_displayed_line; i >= 0; i--) {
|
---|
[2725] | 1481 | if (strchr(flines[i], bracket) != NULL) {
|
---|
| 1482 | buffer_line(i);
|
---|
| 1483 | return;
|
---|
[821] | 1484 | }
|
---|
| 1485 | }
|
---|
[2725] | 1486 | print_statusline("No matching bracket found");
|
---|
[821] | 1487 | }
|
---|
[1765] | 1488 | #endif /* FEATURE_LESS_BRACKETS */
|
---|
[821] | 1489 |
|
---|
| 1490 | static void keypress_process(int keypress)
|
---|
| 1491 | {
|
---|
| 1492 | switch (keypress) {
|
---|
[2725] | 1493 | case KEYCODE_DOWN: case 'e': case 'j': case 0x0d:
|
---|
[1765] | 1494 | buffer_down(1);
|
---|
| 1495 | break;
|
---|
[2725] | 1496 | case KEYCODE_UP: case 'y': case 'k':
|
---|
[1765] | 1497 | buffer_up(1);
|
---|
| 1498 | break;
|
---|
[2725] | 1499 | case KEYCODE_PAGEDOWN: case ' ': case 'z': case 'f':
|
---|
[1765] | 1500 | buffer_down(max_displayed_line + 1);
|
---|
| 1501 | break;
|
---|
[2725] | 1502 | case KEYCODE_PAGEUP: case 'w': case 'b':
|
---|
[1765] | 1503 | buffer_up(max_displayed_line + 1);
|
---|
| 1504 | break;
|
---|
| 1505 | case 'd':
|
---|
| 1506 | buffer_down((max_displayed_line + 1) / 2);
|
---|
| 1507 | break;
|
---|
| 1508 | case 'u':
|
---|
| 1509 | buffer_up((max_displayed_line + 1) / 2);
|
---|
| 1510 | break;
|
---|
[2725] | 1511 | case KEYCODE_HOME: case 'g': case 'p': case '<': case '%':
|
---|
[1765] | 1512 | buffer_line(0);
|
---|
| 1513 | break;
|
---|
[2725] | 1514 | case KEYCODE_END: case 'G': case '>':
|
---|
[1765] | 1515 | cur_fline = MAXLINES;
|
---|
| 1516 | read_lines();
|
---|
| 1517 | buffer_line(cur_fline);
|
---|
| 1518 | break;
|
---|
| 1519 | case 'q': case 'Q':
|
---|
[2725] | 1520 | less_exit(EXIT_SUCCESS);
|
---|
[1765] | 1521 | break;
|
---|
| 1522 | #if ENABLE_FEATURE_LESS_MARKS
|
---|
| 1523 | case 'm':
|
---|
| 1524 | add_mark();
|
---|
| 1525 | buffer_print();
|
---|
| 1526 | break;
|
---|
| 1527 | case '\'':
|
---|
| 1528 | goto_mark();
|
---|
| 1529 | buffer_print();
|
---|
| 1530 | break;
|
---|
[821] | 1531 | #endif
|
---|
[1765] | 1532 | case 'r': case 'R':
|
---|
[3232] | 1533 | /* TODO: (1) also bind ^R, ^L to this?
|
---|
| 1534 | * (2) re-measure window size?
|
---|
| 1535 | */
|
---|
[1765] | 1536 | buffer_print();
|
---|
| 1537 | break;
|
---|
| 1538 | /*case 'R':
|
---|
| 1539 | full_repaint();
|
---|
| 1540 | break;*/
|
---|
| 1541 | case 's':
|
---|
| 1542 | save_input_to_file();
|
---|
| 1543 | break;
|
---|
| 1544 | case 'E':
|
---|
| 1545 | examine_file();
|
---|
| 1546 | break;
|
---|
| 1547 | #if ENABLE_FEATURE_LESS_FLAGS
|
---|
| 1548 | case '=':
|
---|
| 1549 | m_status_print();
|
---|
| 1550 | break;
|
---|
[821] | 1551 | #endif
|
---|
[1765] | 1552 | #if ENABLE_FEATURE_LESS_REGEXP
|
---|
| 1553 | case '/':
|
---|
| 1554 | option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1555 | regex_process();
|
---|
| 1556 | break;
|
---|
| 1557 | case 'n':
|
---|
| 1558 | goto_match(match_pos + 1);
|
---|
| 1559 | break;
|
---|
| 1560 | case 'N':
|
---|
| 1561 | goto_match(match_pos - 1);
|
---|
| 1562 | break;
|
---|
| 1563 | case '?':
|
---|
| 1564 | option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
---|
| 1565 | regex_process();
|
---|
| 1566 | break;
|
---|
[821] | 1567 | #endif
|
---|
[2725] | 1568 | #if ENABLE_FEATURE_LESS_DASHCMD
|
---|
[1765] | 1569 | case '-':
|
---|
| 1570 | flag_change();
|
---|
| 1571 | buffer_print();
|
---|
| 1572 | break;
|
---|
[2725] | 1573 | #ifdef BLOAT
|
---|
[1765] | 1574 | case '_':
|
---|
| 1575 | show_flag_status();
|
---|
| 1576 | break;
|
---|
[821] | 1577 | #endif
|
---|
[2725] | 1578 | #endif
|
---|
[1765] | 1579 | #if ENABLE_FEATURE_LESS_BRACKETS
|
---|
| 1580 | case '{': case '(': case '[':
|
---|
| 1581 | match_right_bracket(keypress);
|
---|
| 1582 | break;
|
---|
| 1583 | case '}': case ')': case ']':
|
---|
| 1584 | match_left_bracket(keypress);
|
---|
| 1585 | break;
|
---|
[821] | 1586 | #endif
|
---|
[1765] | 1587 | case ':':
|
---|
| 1588 | colon_process();
|
---|
| 1589 | break;
|
---|
[821] | 1590 | }
|
---|
| 1591 |
|
---|
| 1592 | if (isdigit(keypress))
|
---|
| 1593 | number_process(keypress);
|
---|
| 1594 | }
|
---|
| 1595 |
|
---|
[2725] | 1596 | static void sig_catcher(int sig)
|
---|
[1765] | 1597 | {
|
---|
[2725] | 1598 | less_exit(- sig);
|
---|
[1765] | 1599 | }
|
---|
[821] | 1600 |
|
---|
[2725] | 1601 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1602 | static void sigwinch_handler(int sig UNUSED_PARAM)
|
---|
| 1603 | {
|
---|
| 1604 | winch_counter++;
|
---|
| 1605 | }
|
---|
| 1606 | #endif
|
---|
| 1607 |
|
---|
| 1608 | int less_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
[1765] | 1609 | int less_main(int argc, char **argv)
|
---|
| 1610 | {
|
---|
| 1611 | INIT_G();
|
---|
[821] | 1612 |
|
---|
[1765] | 1613 | /* TODO: -x: do not interpret backspace, -xx: tab also */
|
---|
| 1614 | /* -xxx: newline also */
|
---|
| 1615 | /* -w N: assume width N (-xxx -w 32: hex viewer of sorts) */
|
---|
[2725] | 1616 | getopt32(argv, "EMmN~I" IF_FEATURE_LESS_DASHCMD("S"));
|
---|
[821] | 1617 | argc -= optind;
|
---|
| 1618 | argv += optind;
|
---|
[1765] | 1619 | num_files = argc;
|
---|
[821] | 1620 | files = argv;
|
---|
| 1621 |
|
---|
[1765] | 1622 | /* Another popular pager, most, detects when stdout
|
---|
| 1623 | * is not a tty and turns into cat. This makes sense. */
|
---|
| 1624 | if (!isatty(STDOUT_FILENO))
|
---|
| 1625 | return bb_cat(argv);
|
---|
| 1626 |
|
---|
[821] | 1627 | if (!num_files) {
|
---|
[1765] | 1628 | if (isatty(STDIN_FILENO)) {
|
---|
| 1629 | /* Just "less"? No args and no redirection? */
|
---|
| 1630 | bb_error_msg("missing filename");
|
---|
[821] | 1631 | bb_show_usage();
|
---|
| 1632 | }
|
---|
[2725] | 1633 | } else {
|
---|
[1765] | 1634 | filename = xstrdup(files[0]);
|
---|
[2725] | 1635 | }
|
---|
[821] | 1636 |
|
---|
[1765] | 1637 | if (option_mask32 & FLAG_TILDE)
|
---|
| 1638 | empty_line_marker = "";
|
---|
| 1639 |
|
---|
[2725] | 1640 | kbd_fd = open(CURRENT_TTY, O_RDONLY);
|
---|
| 1641 | if (kbd_fd < 0)
|
---|
| 1642 | return bb_cat(argv);
|
---|
| 1643 | ndelay_on(kbd_fd);
|
---|
| 1644 |
|
---|
[1765] | 1645 | tcgetattr(kbd_fd, &term_orig);
|
---|
| 1646 | term_less = term_orig;
|
---|
| 1647 | term_less.c_lflag &= ~(ICANON | ECHO);
|
---|
| 1648 | term_less.c_iflag &= ~(IXON | ICRNL);
|
---|
| 1649 | /*term_less.c_oflag &= ~ONLCR;*/
|
---|
| 1650 | term_less.c_cc[VMIN] = 1;
|
---|
| 1651 | term_less.c_cc[VTIME] = 0;
|
---|
| 1652 |
|
---|
[3232] | 1653 | IF_FEATURE_LESS_ASK_TERMINAL(G.winsize_err =) get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
[2725] | 1654 | /* 20: two tabstops + 4 */
|
---|
| 1655 | if (width < 20 || max_displayed_line < 3)
|
---|
| 1656 | return bb_cat(argv);
|
---|
| 1657 | max_displayed_line -= 2;
|
---|
[1765] | 1658 |
|
---|
[2725] | 1659 | /* We want to restore term_orig on exit */
|
---|
| 1660 | bb_signals(BB_FATAL_SIGS, sig_catcher);
|
---|
| 1661 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1662 | signal(SIGWINCH, sigwinch_handler);
|
---|
| 1663 | #endif
|
---|
| 1664 |
|
---|
| 1665 | buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
---|
[1765] | 1666 | reinitialize();
|
---|
[821] | 1667 | while (1) {
|
---|
[3232] | 1668 | int64_t keypress;
|
---|
| 1669 |
|
---|
[2725] | 1670 | #if ENABLE_FEATURE_LESS_WINCH
|
---|
| 1671 | while (WINCH_COUNTER) {
|
---|
| 1672 | again:
|
---|
| 1673 | winch_counter--;
|
---|
[3232] | 1674 | IF_FEATURE_LESS_ASK_TERMINAL(G.winsize_err =) get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
---|
| 1675 | IF_FEATURE_LESS_ASK_TERMINAL(got_size:)
|
---|
[2725] | 1676 | /* 20: two tabstops + 4 */
|
---|
| 1677 | if (width < 20)
|
---|
| 1678 | width = 20;
|
---|
| 1679 | if (max_displayed_line < 3)
|
---|
| 1680 | max_displayed_line = 3;
|
---|
| 1681 | max_displayed_line -= 2;
|
---|
| 1682 | free(buffer);
|
---|
| 1683 | buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
---|
| 1684 | /* Avoid re-wrap and/or redraw if we already know
|
---|
| 1685 | * we need to do it again. These ops are expensive */
|
---|
| 1686 | if (WINCH_COUNTER)
|
---|
| 1687 | goto again;
|
---|
| 1688 | re_wrap();
|
---|
| 1689 | if (WINCH_COUNTER)
|
---|
| 1690 | goto again;
|
---|
| 1691 | buffer_fill_and_print();
|
---|
| 1692 | /* This took some time. Loop back and check,
|
---|
| 1693 | * were there another SIGWINCH? */
|
---|
| 1694 | }
|
---|
[3232] | 1695 | keypress = less_getch(-1); /* -1: do not position cursor */
|
---|
| 1696 | # if ENABLE_FEATURE_LESS_ASK_TERMINAL
|
---|
| 1697 | if ((int32_t)keypress == KEYCODE_CURSOR_POS) {
|
---|
| 1698 | uint32_t rc = (keypress >> 32);
|
---|
| 1699 | width = (rc & 0x7fff);
|
---|
| 1700 | max_displayed_line = ((rc >> 16) & 0x7fff);
|
---|
| 1701 | goto got_size;
|
---|
| 1702 | }
|
---|
| 1703 | # endif
|
---|
| 1704 | #else
|
---|
| 1705 | keypress = less_getch(-1); /* -1: do not position cursor */
|
---|
[2725] | 1706 | #endif
|
---|
[821] | 1707 | keypress_process(keypress);
|
---|
| 1708 | }
|
---|
| 1709 | }
|
---|
[2725] | 1710 |
|
---|
| 1711 | /*
|
---|
| 1712 | Help text of less version 418 is below.
|
---|
| 1713 | If you are implementing something, keeping
|
---|
| 1714 | key and/or command line switch compatibility is a good idea:
|
---|
| 1715 |
|
---|
| 1716 |
|
---|
| 1717 | SUMMARY OF LESS COMMANDS
|
---|
| 1718 |
|
---|
| 1719 | Commands marked with * may be preceded by a number, N.
|
---|
| 1720 | Notes in parentheses indicate the behavior if N is given.
|
---|
| 1721 | h H Display this help.
|
---|
| 1722 | q :q Q :Q ZZ Exit.
|
---|
| 1723 | ---------------------------------------------------------------------------
|
---|
| 1724 | MOVING
|
---|
| 1725 | e ^E j ^N CR * Forward one line (or N lines).
|
---|
| 1726 | y ^Y k ^K ^P * Backward one line (or N lines).
|
---|
| 1727 | f ^F ^V SPACE * Forward one window (or N lines).
|
---|
| 1728 | b ^B ESC-v * Backward one window (or N lines).
|
---|
| 1729 | z * Forward one window (and set window to N).
|
---|
| 1730 | w * Backward one window (and set window to N).
|
---|
| 1731 | ESC-SPACE * Forward one window, but don't stop at end-of-file.
|
---|
| 1732 | d ^D * Forward one half-window (and set half-window to N).
|
---|
| 1733 | u ^U * Backward one half-window (and set half-window to N).
|
---|
| 1734 | ESC-) RightArrow * Left one half screen width (or N positions).
|
---|
| 1735 | ESC-( LeftArrow * Right one half screen width (or N positions).
|
---|
| 1736 | F Forward forever; like "tail -f".
|
---|
| 1737 | r ^R ^L Repaint screen.
|
---|
| 1738 | R Repaint screen, discarding buffered input.
|
---|
| 1739 | ---------------------------------------------------
|
---|
| 1740 | Default "window" is the screen height.
|
---|
| 1741 | Default "half-window" is half of the screen height.
|
---|
| 1742 | ---------------------------------------------------------------------------
|
---|
| 1743 | SEARCHING
|
---|
| 1744 | /pattern * Search forward for (N-th) matching line.
|
---|
| 1745 | ?pattern * Search backward for (N-th) matching line.
|
---|
| 1746 | n * Repeat previous search (for N-th occurrence).
|
---|
| 1747 | N * Repeat previous search in reverse direction.
|
---|
| 1748 | ESC-n * Repeat previous search, spanning files.
|
---|
| 1749 | ESC-N * Repeat previous search, reverse dir. & spanning files.
|
---|
| 1750 | ESC-u Undo (toggle) search highlighting.
|
---|
| 1751 | ---------------------------------------------------
|
---|
| 1752 | Search patterns may be modified by one or more of:
|
---|
| 1753 | ^N or ! Search for NON-matching lines.
|
---|
| 1754 | ^E or * Search multiple files (pass thru END OF FILE).
|
---|
| 1755 | ^F or @ Start search at FIRST file (for /) or last file (for ?).
|
---|
| 1756 | ^K Highlight matches, but don't move (KEEP position).
|
---|
| 1757 | ^R Don't use REGULAR EXPRESSIONS.
|
---|
| 1758 | ---------------------------------------------------------------------------
|
---|
| 1759 | JUMPING
|
---|
| 1760 | g < ESC-< * Go to first line in file (or line N).
|
---|
| 1761 | G > ESC-> * Go to last line in file (or line N).
|
---|
| 1762 | p % * Go to beginning of file (or N percent into file).
|
---|
| 1763 | t * Go to the (N-th) next tag.
|
---|
| 1764 | T * Go to the (N-th) previous tag.
|
---|
| 1765 | { ( [ * Find close bracket } ) ].
|
---|
| 1766 | } ) ] * Find open bracket { ( [.
|
---|
| 1767 | ESC-^F <c1> <c2> * Find close bracket <c2>.
|
---|
| 1768 | ESC-^B <c1> <c2> * Find open bracket <c1>
|
---|
| 1769 | ---------------------------------------------------
|
---|
| 1770 | Each "find close bracket" command goes forward to the close bracket
|
---|
| 1771 | matching the (N-th) open bracket in the top line.
|
---|
| 1772 | Each "find open bracket" command goes backward to the open bracket
|
---|
| 1773 | matching the (N-th) close bracket in the bottom line.
|
---|
| 1774 | m<letter> Mark the current position with <letter>.
|
---|
| 1775 | '<letter> Go to a previously marked position.
|
---|
| 1776 | '' Go to the previous position.
|
---|
| 1777 | ^X^X Same as '.
|
---|
| 1778 | ---------------------------------------------------
|
---|
| 1779 | A mark is any upper-case or lower-case letter.
|
---|
| 1780 | Certain marks are predefined:
|
---|
| 1781 | ^ means beginning of the file
|
---|
| 1782 | $ means end of the file
|
---|
| 1783 | ---------------------------------------------------------------------------
|
---|
| 1784 | CHANGING FILES
|
---|
| 1785 | :e [file] Examine a new file.
|
---|
| 1786 | ^X^V Same as :e.
|
---|
| 1787 | :n * Examine the (N-th) next file from the command line.
|
---|
| 1788 | :p * Examine the (N-th) previous file from the command line.
|
---|
| 1789 | :x * Examine the first (or N-th) file from the command line.
|
---|
| 1790 | :d Delete the current file from the command line list.
|
---|
| 1791 | = ^G :f Print current file name.
|
---|
| 1792 | ---------------------------------------------------------------------------
|
---|
| 1793 | MISCELLANEOUS COMMANDS
|
---|
| 1794 | -<flag> Toggle a command line option [see OPTIONS below].
|
---|
| 1795 | --<name> Toggle a command line option, by name.
|
---|
| 1796 | _<flag> Display the setting of a command line option.
|
---|
| 1797 | __<name> Display the setting of an option, by name.
|
---|
| 1798 | +cmd Execute the less cmd each time a new file is examined.
|
---|
| 1799 | !command Execute the shell command with $SHELL.
|
---|
| 1800 | |Xcommand Pipe file between current pos & mark X to shell command.
|
---|
| 1801 | v Edit the current file with $VISUAL or $EDITOR.
|
---|
| 1802 | V Print version number of "less".
|
---|
| 1803 | ---------------------------------------------------------------------------
|
---|
| 1804 | OPTIONS
|
---|
| 1805 | Most options may be changed either on the command line,
|
---|
| 1806 | or from within less by using the - or -- command.
|
---|
| 1807 | Options may be given in one of two forms: either a single
|
---|
| 1808 | character preceded by a -, or a name preceeded by --.
|
---|
| 1809 | -? ........ --help
|
---|
| 1810 | Display help (from command line).
|
---|
| 1811 | -a ........ --search-skip-screen
|
---|
| 1812 | Forward search skips current screen.
|
---|
| 1813 | -b [N] .... --buffers=[N]
|
---|
| 1814 | Number of buffers.
|
---|
| 1815 | -B ........ --auto-buffers
|
---|
| 1816 | Don't automatically allocate buffers for pipes.
|
---|
| 1817 | -c ........ --clear-screen
|
---|
| 1818 | Repaint by clearing rather than scrolling.
|
---|
| 1819 | -d ........ --dumb
|
---|
| 1820 | Dumb terminal.
|
---|
| 1821 | -D [xn.n] . --color=xn.n
|
---|
| 1822 | Set screen colors. (MS-DOS only)
|
---|
| 1823 | -e -E .... --quit-at-eof --QUIT-AT-EOF
|
---|
| 1824 | Quit at end of file.
|
---|
| 1825 | -f ........ --force
|
---|
| 1826 | Force open non-regular files.
|
---|
| 1827 | -F ........ --quit-if-one-screen
|
---|
| 1828 | Quit if entire file fits on first screen.
|
---|
| 1829 | -g ........ --hilite-search
|
---|
| 1830 | Highlight only last match for searches.
|
---|
| 1831 | -G ........ --HILITE-SEARCH
|
---|
| 1832 | Don't highlight any matches for searches.
|
---|
| 1833 | -h [N] .... --max-back-scroll=[N]
|
---|
| 1834 | Backward scroll limit.
|
---|
| 1835 | -i ........ --ignore-case
|
---|
| 1836 | Ignore case in searches that do not contain uppercase.
|
---|
| 1837 | -I ........ --IGNORE-CASE
|
---|
| 1838 | Ignore case in all searches.
|
---|
| 1839 | -j [N] .... --jump-target=[N]
|
---|
| 1840 | Screen position of target lines.
|
---|
| 1841 | -J ........ --status-column
|
---|
| 1842 | Display a status column at left edge of screen.
|
---|
| 1843 | -k [file] . --lesskey-file=[file]
|
---|
| 1844 | Use a lesskey file.
|
---|
| 1845 | -L ........ --no-lessopen
|
---|
| 1846 | Ignore the LESSOPEN environment variable.
|
---|
| 1847 | -m -M .... --long-prompt --LONG-PROMPT
|
---|
| 1848 | Set prompt style.
|
---|
| 1849 | -n -N .... --line-numbers --LINE-NUMBERS
|
---|
| 1850 | Don't use line numbers.
|
---|
| 1851 | -o [file] . --log-file=[file]
|
---|
| 1852 | Copy to log file (standard input only).
|
---|
| 1853 | -O [file] . --LOG-FILE=[file]
|
---|
| 1854 | Copy to log file (unconditionally overwrite).
|
---|
| 1855 | -p [pattern] --pattern=[pattern]
|
---|
| 1856 | Start at pattern (from command line).
|
---|
| 1857 | -P [prompt] --prompt=[prompt]
|
---|
| 1858 | Define new prompt.
|
---|
| 1859 | -q -Q .... --quiet --QUIET --silent --SILENT
|
---|
| 1860 | Quiet the terminal bell.
|
---|
| 1861 | -r -R .... --raw-control-chars --RAW-CONTROL-CHARS
|
---|
| 1862 | Output "raw" control characters.
|
---|
| 1863 | -s ........ --squeeze-blank-lines
|
---|
| 1864 | Squeeze multiple blank lines.
|
---|
| 1865 | -S ........ --chop-long-lines
|
---|
| 1866 | Chop long lines.
|
---|
| 1867 | -t [tag] .. --tag=[tag]
|
---|
| 1868 | Find a tag.
|
---|
| 1869 | -T [tagsfile] --tag-file=[tagsfile]
|
---|
| 1870 | Use an alternate tags file.
|
---|
| 1871 | -u -U .... --underline-special --UNDERLINE-SPECIAL
|
---|
| 1872 | Change handling of backspaces.
|
---|
| 1873 | -V ........ --version
|
---|
| 1874 | Display the version number of "less".
|
---|
| 1875 | -w ........ --hilite-unread
|
---|
| 1876 | Highlight first new line after forward-screen.
|
---|
| 1877 | -W ........ --HILITE-UNREAD
|
---|
| 1878 | Highlight first new line after any forward movement.
|
---|
| 1879 | -x [N[,...]] --tabs=[N[,...]]
|
---|
| 1880 | Set tab stops.
|
---|
| 1881 | -X ........ --no-init
|
---|
| 1882 | Don't use termcap init/deinit strings.
|
---|
| 1883 | --no-keypad
|
---|
| 1884 | Don't use termcap keypad init/deinit strings.
|
---|
| 1885 | -y [N] .... --max-forw-scroll=[N]
|
---|
| 1886 | Forward scroll limit.
|
---|
| 1887 | -z [N] .... --window=[N]
|
---|
| 1888 | Set size of window.
|
---|
| 1889 | -" [c[c]] . --quotes=[c[c]]
|
---|
| 1890 | Set shell quote characters.
|
---|
| 1891 | -~ ........ --tilde
|
---|
| 1892 | Don't display tildes after end of file.
|
---|
| 1893 | -# [N] .... --shift=[N]
|
---|
| 1894 | Horizontal scroll amount (0 = one half screen width)
|
---|
| 1895 |
|
---|
| 1896 | ---------------------------------------------------------------------------
|
---|
| 1897 | LINE EDITING
|
---|
| 1898 | These keys can be used to edit text being entered
|
---|
| 1899 | on the "command line" at the bottom of the screen.
|
---|
| 1900 | RightArrow ESC-l Move cursor right one character.
|
---|
| 1901 | LeftArrow ESC-h Move cursor left one character.
|
---|
| 1902 | CNTL-RightArrow ESC-RightArrow ESC-w Move cursor right one word.
|
---|
| 1903 | CNTL-LeftArrow ESC-LeftArrow ESC-b Move cursor left one word.
|
---|
| 1904 | HOME ESC-0 Move cursor to start of line.
|
---|
| 1905 | END ESC-$ Move cursor to end of line.
|
---|
| 1906 | BACKSPACE Delete char to left of cursor.
|
---|
| 1907 | DELETE ESC-x Delete char under cursor.
|
---|
| 1908 | CNTL-BACKSPACE ESC-BACKSPACE Delete word to left of cursor.
|
---|
| 1909 | CNTL-DELETE ESC-DELETE ESC-X Delete word under cursor.
|
---|
| 1910 | CNTL-U ESC (MS-DOS only) Delete entire line.
|
---|
| 1911 | UpArrow ESC-k Retrieve previous command line.
|
---|
| 1912 | DownArrow ESC-j Retrieve next command line.
|
---|
| 1913 | TAB Complete filename & cycle.
|
---|
| 1914 | SHIFT-TAB ESC-TAB Complete filename & reverse cycle.
|
---|
| 1915 | CNTL-L Complete filename, list all.
|
---|
| 1916 | */
|
---|