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1/* vi: set sw=4 ts=4: */
2/*
3 * sed.c - very minimalist version of sed
4 *
5 * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
6 * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
7 * Copyright (C) 2002 Matt Kraai
8 * Copyright (C) 2003 by Glenn McGrath
9 * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
10 *
11 * MAINTAINER: Rob Landley <rob@landley.net>
12 *
13 * Licensed under GPLv2, see file LICENSE in this source tree.
14 */
15
16/* Code overview.
17 *
18 * Files are laid out to avoid unnecessary function declarations. So for
19 * example, every function add_cmd calls occurs before add_cmd in this file.
20 *
21 * add_cmd() is called on each line of sed command text (from a file or from
22 * the command line). It calls get_address() and parse_cmd_args(). The
23 * resulting sed_cmd_t structures are appended to a linked list
24 * (G.sed_cmd_head/G.sed_cmd_tail).
25 *
26 * process_files() does actual sedding, reading data lines from each input FILE*
27 * (which could be stdin) and applying the sed command list (sed_cmd_head) to
28 * each of the resulting lines.
29 *
30 * sed_main() is where external code calls into this, with a command line.
31 */
32
33/* Supported features and commands in this version of sed:
34 *
35 * - comments ('#')
36 * - address matching: num|/matchstr/[,num|/matchstr/|$]command
37 * - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
38 * - edit commands: (a)ppend, (i)nsert, (c)hange
39 * - file commands: (r)ead
40 * - backreferences in substitution expressions (\0, \1, \2...\9)
41 * - grouped commands: {cmd1;cmd2}
42 * - transliteration (y/source-chars/dest-chars/)
43 * - pattern space hold space storing / swapping (g, h, x)
44 * - labels / branching (: label, b, t, T)
45 *
46 * (Note: Specifying an address (range) to match is *optional*; commands
47 * default to the whole pattern space if no specific address match was
48 * requested.)
49 *
50 * Todo:
51 * - Create a wrapper around regex to make libc's regex conform with sed
52 *
53 * Reference
54 * http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
55 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html
56 */
57
58//config:config SED
59//config: bool "sed"
60//config: default y
61//config: help
62//config: sed is used to perform text transformations on a file
63//config: or input from a pipeline.
64
65//kbuild:lib-$(CONFIG_SED) += sed.o
66
67//applet:IF_SED(APPLET(sed, BB_DIR_BIN, BB_SUID_DROP))
68
69//usage:#define sed_trivial_usage
70//usage: "[-inrE] [-f FILE]... [-e CMD]... [FILE]...\n"
71//usage: "or: sed [-inrE] CMD [FILE]..."
72//usage:#define sed_full_usage "\n\n"
73//usage: " -e CMD Add CMD to sed commands to be executed"
74//usage: "\n -f FILE Add FILE contents to sed commands to be executed"
75//usage: "\n -i[SFX] Edit files in-place (otherwise sends to stdout)"
76//usage: "\n Optionally back files up, appending SFX"
77//usage: "\n -n Suppress automatic printing of pattern space"
78//usage: "\n -r,-E Use extended regex syntax"
79//usage: "\n"
80//usage: "\nIf no -e or -f, the first non-option argument is the sed command string."
81//usage: "\nRemaining arguments are input files (stdin if none)."
82//usage:
83//usage:#define sed_example_usage
84//usage: "$ echo \"foo\" | sed -e 's/f[a-zA-Z]o/bar/g'\n"
85//usage: "bar\n"
86
87#include "libbb.h"
88#include "xregex.h"
89
90#if 0
91# define dbg(...) bb_error_msg(__VA_ARGS__)
92#else
93# define dbg(...) ((void)0)
94#endif
95
96
97enum {
98 OPT_in_place = 1 << 0,
99};
100
101/* Each sed command turns into one of these structures. */
102typedef struct sed_cmd_s {
103 /* Ordered by alignment requirements: currently 36 bytes on x86 */
104 struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
105
106 /* address storage */
107 regex_t *beg_match; /* sed -e '/match/cmd' */
108 regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
109 regex_t *sub_match; /* For 's/sub_match/string/' */
110 int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
111 int beg_line_orig; /* copy of the above, needed for -i */
112 int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
113
114 FILE *sw_file; /* File (sw) command writes to, -1 for none. */
115 char *string; /* Data string for (saicytb) commands. */
116
117 unsigned which_match; /* (s) Which match to replace (0 for all) */
118
119 /* Bitfields (gcc won't group them if we don't) */
120 unsigned invert:1; /* the '!' after the address */
121 unsigned in_match:1; /* Next line also included in match? */
122 unsigned sub_p:1; /* (s) print option */
123
124 char sw_last_char; /* Last line written by (sw) had no '\n' */
125
126 /* GENERAL FIELDS */
127 char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
128} sed_cmd_t;
129
130static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
131
132struct globals {
133 /* options */
134 int be_quiet, regex_type;
135
136 FILE *nonstdout;
137 char *outname, *hold_space;
138 smallint exitcode;
139
140 /* list of input files */
141 int current_input_file, last_input_file;
142 char **input_file_list;
143 FILE *current_fp;
144
145 regmatch_t regmatch[10];
146 regex_t *previous_regex_ptr;
147
148 /* linked list of sed commands */
149 sed_cmd_t *sed_cmd_head, **sed_cmd_tail;
150
151 /* linked list of append lines */
152 llist_t *append_head;
153
154 char *add_cmd_line;
155
156 struct pipeline {
157 char *buf; /* Space to hold string */
158 int idx; /* Space used */
159 int len; /* Space allocated */
160 } pipeline;
161} FIX_ALIASING;
162#define G (*(struct globals*)&bb_common_bufsiz1)
163struct BUG_G_too_big {
164 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
165};
166#define INIT_G() do { \
167 G.sed_cmd_tail = &G.sed_cmd_head; \
168} while (0)
169
170
171#if ENABLE_FEATURE_CLEAN_UP
172static void sed_free_and_close_stuff(void)
173{
174 sed_cmd_t *sed_cmd = G.sed_cmd_head;
175
176 llist_free(G.append_head, free);
177
178 while (sed_cmd) {
179 sed_cmd_t *sed_cmd_next = sed_cmd->next;
180
181 if (sed_cmd->sw_file)
182 xprint_and_close_file(sed_cmd->sw_file);
183
184 if (sed_cmd->beg_match) {
185 regfree(sed_cmd->beg_match);
186 free(sed_cmd->beg_match);
187 }
188 if (sed_cmd->end_match) {
189 regfree(sed_cmd->end_match);
190 free(sed_cmd->end_match);
191 }
192 if (sed_cmd->sub_match) {
193 regfree(sed_cmd->sub_match);
194 free(sed_cmd->sub_match);
195 }
196 free(sed_cmd->string);
197 free(sed_cmd);
198 sed_cmd = sed_cmd_next;
199 }
200
201 free(G.hold_space);
202
203 if (G.current_fp)
204 fclose(G.current_fp);
205}
206#else
207void sed_free_and_close_stuff(void);
208#endif
209
210/* If something bad happens during -i operation, delete temp file */
211
212static void cleanup_outname(void)
213{
214 if (G.outname) unlink(G.outname);
215}
216
217/* strcpy, replacing "\from" with 'to'. If to is NUL, replacing "\any" with 'any' */
218
219static void parse_escapes(char *dest, const char *string, int len, char from, char to)
220{
221 int i = 0;
222
223 while (i < len) {
224 if (string[i] == '\\') {
225 if (!to || string[i+1] == from) {
226 *dest++ = to ? to : string[i+1];
227 i += 2;
228 continue;
229 }
230 *dest++ = string[i++];
231 }
232 /* TODO: is it safe wrt a string with trailing '\\' ? */
233 *dest++ = string[i++];
234 }
235 *dest = '\0';
236}
237
238static char *copy_parsing_escapes(const char *string, int len)
239{
240 const char *s;
241 char *dest = xmalloc(len + 1);
242
243 /* sed recognizes \n */
244 /* GNU sed also recognizes \t and \r */
245 for (s = "\nn\tt\rr"; *s; s += 2) {
246 parse_escapes(dest, string, len, s[1], s[0]);
247 string = dest;
248 len = strlen(dest);
249 }
250 return dest;
251}
252
253
254/*
255 * index_of_next_unescaped_regexp_delim - walks left to right through a string
256 * beginning at a specified index and returns the index of the next regular
257 * expression delimiter (typically a forward slash ('/')) not preceded by
258 * a backslash ('\'). A negative delimiter disables square bracket checking.
259 */
260static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
261{
262 int bracket = -1;
263 int escaped = 0;
264 int idx = 0;
265 char ch;
266
267 if (delimiter < 0) {
268 bracket--;
269 delimiter = -delimiter;
270 }
271
272 for (; (ch = str[idx]) != '\0'; idx++) {
273 if (bracket >= 0) {
274 if (ch == ']'
275 && !(bracket == idx - 1 || (bracket == idx - 2 && str[idx - 1] == '^'))
276 ) {
277 bracket = -1;
278 }
279 } else if (escaped)
280 escaped = 0;
281 else if (ch == '\\')
282 escaped = 1;
283 else if (bracket == -1 && ch == '[')
284 bracket = idx;
285 else if (ch == delimiter)
286 return idx;
287 }
288
289 /* if we make it to here, we've hit the end of the string */
290 bb_error_msg_and_die("unmatched '%c'", delimiter);
291}
292
293/*
294 * Returns the index of the third delimiter
295 */
296static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
297{
298 const char *cmdstr_ptr = cmdstr;
299 unsigned char delimiter;
300 int idx = 0;
301
302 /* verify that the 's' or 'y' is followed by something. That something
303 * (typically a 'slash') is now our regexp delimiter... */
304 if (*cmdstr == '\0')
305 bb_error_msg_and_die("bad format in substitution expression");
306 delimiter = *cmdstr_ptr++;
307
308 /* save the match string */
309 idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
310 *match = copy_parsing_escapes(cmdstr_ptr, idx);
311
312 /* save the replacement string */
313 cmdstr_ptr += idx + 1;
314 idx = index_of_next_unescaped_regexp_delim(- (int)delimiter, cmdstr_ptr);
315 *replace = copy_parsing_escapes(cmdstr_ptr, idx);
316
317 return ((cmdstr_ptr - cmdstr) + idx);
318}
319
320/*
321 * returns the index in the string just past where the address ends.
322 */
323static int get_address(const char *my_str, int *linenum, regex_t ** regex)
324{
325 const char *pos = my_str;
326
327 if (isdigit(*my_str)) {
328 *linenum = strtol(my_str, (char**)&pos, 10);
329 /* endstr shouldnt ever equal NULL */
330 } else if (*my_str == '$') {
331 *linenum = -1;
332 pos++;
333 } else if (*my_str == '/' || *my_str == '\\') {
334 int next;
335 char delimiter;
336 char *temp;
337
338 delimiter = '/';
339 if (*my_str == '\\')
340 delimiter = *++pos;
341 next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
342 temp = copy_parsing_escapes(pos, next);
343 *regex = xzalloc(sizeof(regex_t));
344 xregcomp(*regex, temp, G.regex_type);
345 free(temp);
346 /* Move position to next character after last delimiter */
347 pos += (next+1);
348 }
349 return pos - my_str;
350}
351
352/* Grab a filename. Whitespace at start is skipped, then goes to EOL. */
353static int parse_file_cmd(/*sed_cmd_t *sed_cmd,*/ const char *filecmdstr, char **retval)
354{
355 int start = 0, idx, hack = 0;
356
357 /* Skip whitespace, then grab filename to end of line */
358 while (isspace(filecmdstr[start]))
359 start++;
360 idx = start;
361 while (filecmdstr[idx] && filecmdstr[idx] != '\n')
362 idx++;
363
364 /* If lines glued together, put backslash back. */
365 if (filecmdstr[idx] == '\n')
366 hack = 1;
367 if (idx == start)
368 bb_error_msg_and_die("empty filename");
369 *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
370 if (hack)
371 (*retval)[idx] = '\\';
372
373 return idx;
374}
375
376static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
377{
378 int cflags = G.regex_type;
379 char *match;
380 int idx;
381
382 /*
383 * A substitution command should look something like this:
384 * s/match/replace/ #giIpw
385 * || | |||
386 * mandatory optional
387 */
388 idx = parse_regex_delim(substr, &match, &sed_cmd->string);
389
390 /* determine the number of back references in the match string */
391 /* Note: we compute this here rather than in the do_subst_command()
392 * function to save processor time, at the expense of a little more memory
393 * (4 bits) per sed_cmd */
394
395 /* process the flags */
396
397 sed_cmd->which_match = 1;
398 while (substr[++idx]) {
399 /* Parse match number */
400 if (isdigit(substr[idx])) {
401 if (match[0] != '^') {
402 /* Match 0 treated as all, multiple matches we take the last one. */
403 const char *pos = substr + idx;
404/* FIXME: error check? */
405 sed_cmd->which_match = (unsigned)strtol(substr+idx, (char**) &pos, 10);
406 idx = pos - substr;
407 }
408 continue;
409 }
410 /* Skip spaces */
411 if (isspace(substr[idx]))
412 continue;
413
414 switch (substr[idx]) {
415 /* Replace all occurrences */
416 case 'g':
417 if (match[0] != '^')
418 sed_cmd->which_match = 0;
419 break;
420 /* Print pattern space */
421 case 'p':
422 sed_cmd->sub_p = 1;
423 break;
424 /* Write to file */
425 case 'w':
426 {
427 char *temp;
428 idx += parse_file_cmd(/*sed_cmd,*/ substr+idx, &temp);
429 break;
430 }
431 /* Ignore case (gnu exension) */
432 case 'i':
433 case 'I':
434 cflags |= REG_ICASE;
435 break;
436 /* Comment */
437 case '#':
438 // while (substr[++idx]) continue;
439 idx += strlen(substr + idx); // same
440 /* Fall through */
441 /* End of command */
442 case ';':
443 case '}':
444 goto out;
445 default:
446 bb_error_msg_and_die("bad option in substitution expression");
447 }
448 }
449 out:
450 /* compile the match string into a regex */
451 if (*match != '\0') {
452 /* If match is empty, we use last regex used at runtime */
453 sed_cmd->sub_match = xzalloc(sizeof(regex_t));
454 dbg("xregcomp('%s',%x)", match, cflags);
455 xregcomp(sed_cmd->sub_match, match, cflags);
456 dbg("regcomp ok");
457 }
458 free(match);
459
460 return idx;
461}
462
463/*
464 * Process the commands arguments
465 */
466static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
467{
468 static const char cmd_letters[] = "saicrw:btTydDgGhHlnNpPqx={}";
469 enum {
470 IDX_s = 0,
471 IDX_a,
472 IDX_i,
473 IDX_c,
474 IDX_r,
475 IDX_w,
476 IDX_colon,
477 IDX_b,
478 IDX_t,
479 IDX_T,
480 IDX_y,
481 IDX_d,
482 IDX_D,
483 IDX_g,
484 IDX_G,
485 IDX_h,
486 IDX_H,
487 IDX_l,
488 IDX_n,
489 IDX_N,
490 IDX_p,
491 IDX_P,
492 IDX_q,
493 IDX_x,
494 IDX_equal,
495 IDX_lbrace,
496 IDX_rbrace,
497 IDX_nul
498 };
499 struct chk { char chk[sizeof(cmd_letters)-1 == IDX_nul ? 1 : -1]; };
500
501 unsigned idx = strchrnul(cmd_letters, sed_cmd->cmd) - cmd_letters;
502
503 /* handle (s)ubstitution command */
504 if (idx == IDX_s) {
505 cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
506 }
507 /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
508 else if (idx <= IDX_c) { /* a,i,c */
509 if (idx < IDX_c) { /* a,i */
510 if (sed_cmd->end_line || sed_cmd->end_match)
511 bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
512 }
513 for (;;) {
514 if (*cmdstr == '\n' || *cmdstr == '\\') {
515 cmdstr++;
516 break;
517 }
518 if (!isspace(*cmdstr))
519 break;
520 cmdstr++;
521 }
522 sed_cmd->string = xstrdup(cmdstr);
523 /* "\anychar" -> "anychar" */
524 parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
525 cmdstr += strlen(cmdstr);
526 }
527 /* handle file cmds: (r)ead */
528 else if (idx <= IDX_w) { /* r,w */
529 if (idx < IDX_w) { /* r */
530 if (sed_cmd->end_line || sed_cmd->end_match)
531 bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
532 }
533 cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
534 if (sed_cmd->cmd == 'w') {
535 sed_cmd->sw_file = xfopen_for_write(sed_cmd->string);
536 sed_cmd->sw_last_char = '\n';
537 }
538 }
539 /* handle branch commands */
540 else if (idx <= IDX_T) { /* :,b,t,T */
541 int length;
542
543 cmdstr = skip_whitespace(cmdstr);
544 length = strcspn(cmdstr, semicolon_whitespace);
545 if (length) {
546 sed_cmd->string = xstrndup(cmdstr, length);
547 cmdstr += length;
548 }
549 }
550 /* translation command */
551 else if (idx == IDX_y) {
552 char *match, *replace;
553 int i = cmdstr[0];
554
555 cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
556 /* \n already parsed, but \delimiter needs unescaping. */
557 parse_escapes(match, match, strlen(match), i, i);
558 parse_escapes(replace, replace, strlen(replace), i, i);
559
560 sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
561 for (i = 0; match[i] && replace[i]; i++) {
562 sed_cmd->string[i*2] = match[i];
563 sed_cmd->string[i*2+1] = replace[i];
564 }
565 free(match);
566 free(replace);
567 }
568 /* if it wasnt a single-letter command that takes no arguments
569 * then it must be an invalid command.
570 */
571 else if (idx >= IDX_nul) { /* not d,D,g,G,h,H,l,n,N,p,P,q,x,=,{,} */
572 bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
573 }
574
575 /* give back whatever's left over */
576 return cmdstr;
577}
578
579
580/* Parse address+command sets, skipping comment lines. */
581
582static void add_cmd(const char *cmdstr)
583{
584 sed_cmd_t *sed_cmd;
585 unsigned len, n;
586
587 /* Append this line to any unfinished line from last time. */
588 if (G.add_cmd_line) {
589 char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
590 free(G.add_cmd_line);
591 cmdstr = G.add_cmd_line = tp;
592 }
593
594 /* If this line ends with unescaped backslash, request next line. */
595 n = len = strlen(cmdstr);
596 while (n && cmdstr[n-1] == '\\')
597 n--;
598 if ((len - n) & 1) { /* if odd number of trailing backslashes */
599 if (!G.add_cmd_line)
600 G.add_cmd_line = xstrdup(cmdstr);
601 G.add_cmd_line[len-1] = '\0';
602 return;
603 }
604
605 /* Loop parsing all commands in this line. */
606 while (*cmdstr) {
607 /* Skip leading whitespace and semicolons */
608 cmdstr += strspn(cmdstr, semicolon_whitespace);
609
610 /* If no more commands, exit. */
611 if (!*cmdstr) break;
612
613 /* if this is a comment, jump past it and keep going */
614 if (*cmdstr == '#') {
615 /* "#n" is the same as using -n on the command line */
616 if (cmdstr[1] == 'n')
617 G.be_quiet++;
618 cmdstr = strpbrk(cmdstr, "\n\r");
619 if (!cmdstr) break;
620 continue;
621 }
622
623 /* parse the command
624 * format is: [addr][,addr][!]cmd
625 * |----||-----||-|
626 * part1 part2 part3
627 */
628
629 sed_cmd = xzalloc(sizeof(sed_cmd_t));
630
631 /* first part (if present) is an address: either a '$', a number or a /regex/ */
632 cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
633 sed_cmd->beg_line_orig = sed_cmd->beg_line;
634
635 /* second part (if present) will begin with a comma */
636 if (*cmdstr == ',') {
637 int idx;
638
639 cmdstr++;
640 idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
641 if (!idx)
642 bb_error_msg_and_die("no address after comma");
643 cmdstr += idx;
644 }
645
646 /* skip whitespace before the command */
647 cmdstr = skip_whitespace(cmdstr);
648
649 /* Check for inversion flag */
650 if (*cmdstr == '!') {
651 sed_cmd->invert = 1;
652 cmdstr++;
653
654 /* skip whitespace before the command */
655 cmdstr = skip_whitespace(cmdstr);
656 }
657
658 /* last part (mandatory) will be a command */
659 if (!*cmdstr)
660 bb_error_msg_and_die("missing command");
661 sed_cmd->cmd = *cmdstr++;
662 cmdstr = parse_cmd_args(sed_cmd, cmdstr);
663
664 /* cmdstr now points past args.
665 * GNU sed requires a separator, if there are more commands,
666 * else it complains "char N: extra characters after command".
667 * Example: "sed 'p;d'". We also allow "sed 'pd'".
668 */
669
670 /* Add the command to the command array */
671 *G.sed_cmd_tail = sed_cmd;
672 G.sed_cmd_tail = &sed_cmd->next;
673 }
674
675 /* If we glued multiple lines together, free the memory. */
676 free(G.add_cmd_line);
677 G.add_cmd_line = NULL;
678}
679
680/* Append to a string, reallocating memory as necessary. */
681
682#define PIPE_GROW 64
683
684static void pipe_putc(char c)
685{
686 if (G.pipeline.idx == G.pipeline.len) {
687 G.pipeline.buf = xrealloc(G.pipeline.buf,
688 G.pipeline.len + PIPE_GROW);
689 G.pipeline.len += PIPE_GROW;
690 }
691 G.pipeline.buf[G.pipeline.idx++] = c;
692}
693
694static void do_subst_w_backrefs(char *line, char *replace)
695{
696 int i, j;
697
698 /* go through the replacement string */
699 for (i = 0; replace[i]; i++) {
700 /* if we find a backreference (\1, \2, etc.) print the backref'ed text */
701 if (replace[i] == '\\') {
702 unsigned backref = replace[++i] - '0';
703 if (backref <= 9) {
704 /* print out the text held in G.regmatch[backref] */
705 if (G.regmatch[backref].rm_so != -1) {
706 j = G.regmatch[backref].rm_so;
707 while (j < G.regmatch[backref].rm_eo)
708 pipe_putc(line[j++]);
709 }
710 continue;
711 }
712 /* I _think_ it is impossible to get '\' to be
713 * the last char in replace string. Thus we dont check
714 * for replace[i] == NUL. (counterexample anyone?) */
715 /* if we find a backslash escaped character, print the character */
716 pipe_putc(replace[i]);
717 continue;
718 }
719 /* if we find an unescaped '&' print out the whole matched text. */
720 if (replace[i] == '&') {
721 j = G.regmatch[0].rm_so;
722 while (j < G.regmatch[0].rm_eo)
723 pipe_putc(line[j++]);
724 continue;
725 }
726 /* Otherwise just output the character. */
727 pipe_putc(replace[i]);
728 }
729}
730
731static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
732{
733 char *line = *line_p;
734 unsigned match_count = 0;
735 bool altered = 0;
736 bool prev_match_empty = 1;
737 bool tried_at_eol = 0;
738 regex_t *current_regex;
739
740 current_regex = sed_cmd->sub_match;
741 /* Handle empty regex. */
742 if (!current_regex) {
743 current_regex = G.previous_regex_ptr;
744 if (!current_regex)
745 bb_error_msg_and_die("no previous regexp");
746 }
747 G.previous_regex_ptr = current_regex;
748
749 /* Find the first match */
750 dbg("matching '%s'", line);
751 if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0)) {
752 dbg("no match");
753 return 0;
754 }
755 dbg("match");
756
757 /* Initialize temporary output buffer. */
758 G.pipeline.buf = xmalloc(PIPE_GROW);
759 G.pipeline.len = PIPE_GROW;
760 G.pipeline.idx = 0;
761
762 /* Now loop through, substituting for matches */
763 do {
764 int start = G.regmatch[0].rm_so;
765 int end = G.regmatch[0].rm_eo;
766 int i;
767
768 match_count++;
769
770 /* If we aren't interested in this match, output old line to
771 * end of match and continue */
772 if (sed_cmd->which_match
773 && (sed_cmd->which_match != match_count)
774 ) {
775 for (i = 0; i < end; i++)
776 pipe_putc(*line++);
777 /* Null match? Print one more char */
778 if (start == end && *line)
779 pipe_putc(*line++);
780 goto next;
781 }
782
783 /* Print everything before the match */
784 for (i = 0; i < start; i++)
785 pipe_putc(line[i]);
786
787 /* Then print the substitution string,
788 * unless we just matched empty string after non-empty one.
789 * Example: string "cccd", pattern "c*", repl "R":
790 * result is "RdR", not "RRdR": first match "ccc",
791 * second is "" before "d", third is "" after "d".
792 * Second match is NOT replaced!
793 */
794 if (prev_match_empty || start != 0 || start != end) {
795 //dbg("%d %d %d", prev_match_empty, start, end);
796 dbg("inserting replacement at %d in '%s'", start, line);
797 do_subst_w_backrefs(line, sed_cmd->string);
798 /* Flag that something has changed */
799 altered = 1;
800 } else {
801 dbg("NOT inserting replacement at %d in '%s'", start, line);
802 }
803
804 /* If matched string is empty (f.e. "c*" pattern),
805 * copy verbatim one char after it before attempting more matches
806 */
807 prev_match_empty = (start == end);
808 if (prev_match_empty) {
809 if (!line[end]) {
810 tried_at_eol = 1;
811 } else {
812 pipe_putc(line[end]);
813 end++;
814 }
815 }
816
817 /* Advance past the match */
818 dbg("line += %d", end);
819 line += end;
820
821 /* if we're not doing this globally, get out now */
822 if (sed_cmd->which_match != 0)
823 break;
824 next:
825 /* Exit if we are at EOL and already tried matching at it */
826 if (*line == '\0') {
827 if (tried_at_eol)
828 break;
829 tried_at_eol = 1;
830 }
831
832//maybe (end ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
833 } while (regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
834
835 /* Copy rest of string into output pipeline */
836 while (1) {
837 char c = *line++;
838 pipe_putc(c);
839 if (c == '\0')
840 break;
841 }
842
843 free(*line_p);
844 *line_p = G.pipeline.buf;
845 return altered;
846}
847
848/* Set command pointer to point to this label. (Does not handle null label.) */
849static sed_cmd_t *branch_to(char *label)
850{
851 sed_cmd_t *sed_cmd;
852
853 for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
854 if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
855 return sed_cmd;
856 }
857 }
858 bb_error_msg_and_die("can't find label for jump to '%s'", label);
859}
860
861static void append(char *s)
862{
863 llist_add_to_end(&G.append_head, s);
864}
865
866/* Output line of text. */
867/* Note:
868 * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
869 * Without them, we had this:
870 * echo -n thingy >z1
871 * echo -n again >z2
872 * >znull
873 * sed "s/i/z/" z1 z2 znull | hexdump -vC
874 * output:
875 * gnu sed 4.1.5:
876 * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn|
877 * bbox:
878 * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn|
879 */
880enum {
881 NO_EOL_CHAR = 1,
882 LAST_IS_NUL = 2,
883};
884static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
885{
886 char lpc = *last_puts_char;
887
888 /* Need to insert a '\n' between two files because first file's
889 * last line wasn't terminated? */
890 if (lpc != '\n' && lpc != '\0') {
891 fputc('\n', file);
892 lpc = '\n';
893 }
894 fputs(s, file);
895
896 /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
897 if (s[0])
898 lpc = 'x';
899
900 /* had trailing '\0' and it was last char of file? */
901 if (last_gets_char == LAST_IS_NUL) {
902 fputc('\0', file);
903 lpc = 'x'; /* */
904 } else
905 /* had trailing '\n' or '\0'? */
906 if (last_gets_char != NO_EOL_CHAR) {
907 fputc(last_gets_char, file);
908 lpc = last_gets_char;
909 }
910
911 if (ferror(file)) {
912 xfunc_error_retval = 4; /* It's what gnu sed exits with... */
913 bb_error_msg_and_die(bb_msg_write_error);
914 }
915 *last_puts_char = lpc;
916}
917
918static void flush_append(char *last_puts_char, char last_gets_char)
919{
920 char *data;
921
922 /* Output appended lines. */
923 while ((data = (char *)llist_pop(&G.append_head))) {
924 puts_maybe_newline(data, G.nonstdout, last_puts_char, last_gets_char);
925 free(data);
926 }
927}
928
929/* Get next line of input from G.input_file_list, flushing append buffer and
930 * noting if we ran out of files without a newline on the last line we read.
931 */
932static char *get_next_line(char *gets_char, char *last_puts_char, char last_gets_char)
933{
934 char *temp = NULL;
935 int len;
936 char gc;
937
938 flush_append(last_puts_char, last_gets_char);
939
940 /* will be returned if last line in the file
941 * doesn't end with either '\n' or '\0' */
942 gc = NO_EOL_CHAR;
943 for (; G.current_input_file <= G.last_input_file; G.current_input_file++) {
944 FILE *fp = G.current_fp;
945 if (!fp) {
946 const char *path = G.input_file_list[G.current_input_file];
947 fp = stdin;
948 if (path != bb_msg_standard_input) {
949 fp = fopen_or_warn(path, "r");
950 if (!fp) {
951 G.exitcode = EXIT_FAILURE;
952 continue;
953 }
954 }
955 G.current_fp = fp;
956 }
957 /* Read line up to a newline or NUL byte, inclusive,
958 * return malloc'ed char[]. length of the chunk read
959 * is stored in len. NULL if EOF/error */
960 temp = bb_get_chunk_from_file(fp, &len);
961 if (temp) {
962 /* len > 0 here, it's ok to do temp[len-1] */
963 char c = temp[len-1];
964 if (c == '\n' || c == '\0') {
965 temp[len-1] = '\0';
966 gc = c;
967 if (c == '\0') {
968 int ch = fgetc(fp);
969 if (ch != EOF)
970 ungetc(ch, fp);
971 else
972 gc = LAST_IS_NUL;
973 }
974 }
975 /* else we put NO_EOL_CHAR into *gets_char */
976 break;
977
978 /* NB: I had the idea of peeking next file(s) and returning
979 * NO_EOL_CHAR only if it is the *last* non-empty
980 * input file. But there is a case where this won't work:
981 * file1: "a woo\nb woo"
982 * file2: "c no\nd no"
983 * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
984 * (note: *no* newline after "b bang"!) */
985 }
986 /* Close this file and advance to next one */
987 fclose_if_not_stdin(fp);
988 G.current_fp = NULL;
989 }
990 *gets_char = gc;
991 return temp;
992}
993
994#define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
995
996static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
997{
998 int retval = sed_cmd->beg_match && !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0);
999 if (retval)
1000 G.previous_regex_ptr = sed_cmd->beg_match;
1001 return retval;
1002}
1003
1004/* Process all the lines in all the files */
1005
1006static void process_files(void)
1007{
1008 char *pattern_space, *next_line;
1009 int linenum = 0;
1010 char last_puts_char = '\n';
1011 char last_gets_char, next_gets_char;
1012 sed_cmd_t *sed_cmd;
1013 int substituted;
1014
1015 /* Prime the pump */
1016 next_line = get_next_line(&next_gets_char, &last_puts_char, '\n' /*last_gets_char*/);
1017
1018 /* Go through every line in each file */
1019 again:
1020 substituted = 0;
1021
1022 /* Advance to next line. Stop if out of lines. */
1023 pattern_space = next_line;
1024 if (!pattern_space)
1025 return;
1026 last_gets_char = next_gets_char;
1027
1028 /* Read one line in advance so we can act on the last line,
1029 * the '$' address */
1030 next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char);
1031 linenum++;
1032
1033 /* For every line, go through all the commands */
1034 restart:
1035 for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
1036 int old_matched, matched;
1037
1038 old_matched = sed_cmd->in_match;
1039
1040 /* Determine if this command matches this line: */
1041
1042 dbg("match1:%d", sed_cmd->in_match);
1043 dbg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
1044 && !sed_cmd->beg_match && !sed_cmd->end_match));
1045 dbg("match3:%d", (sed_cmd->beg_line > 0
1046 && (sed_cmd->end_line || sed_cmd->end_match
1047 ? (sed_cmd->beg_line <= linenum)
1048 : (sed_cmd->beg_line == linenum)
1049 )
1050 ));
1051 dbg("match4:%d", (beg_match(sed_cmd, pattern_space)));
1052 dbg("match5:%d", (sed_cmd->beg_line == -1 && next_line == NULL));
1053
1054 /* Are we continuing a previous multi-line match? */
1055 sed_cmd->in_match = sed_cmd->in_match
1056 /* Or is no range necessary? */
1057 || (!sed_cmd->beg_line && !sed_cmd->end_line
1058 && !sed_cmd->beg_match && !sed_cmd->end_match)
1059 /* Or did we match the start of a numerical range? */
1060 || (sed_cmd->beg_line > 0
1061 && (sed_cmd->end_line || sed_cmd->end_match
1062 /* note: even if end is numeric and is < linenum too,
1063 * GNU sed matches! We match too, therefore we don't
1064 * check here that linenum <= end.
1065 * Example:
1066 * printf '1\n2\n3\n4\n' | sed -n '1{N;N;d};1p;2,3p;3p;4p'
1067 * first three input lines are deleted;
1068 * 4th line is matched and printed
1069 * by "2,3" (!) and by "4" ranges
1070 */
1071 ? (sed_cmd->beg_line <= linenum) /* N,end */
1072 : (sed_cmd->beg_line == linenum) /* N */
1073 )
1074 )
1075 /* Or does this line match our begin address regex? */
1076 || (beg_match(sed_cmd, pattern_space))
1077 /* Or did we match last line of input? */
1078 || (sed_cmd->beg_line == -1 && next_line == NULL);
1079
1080 /* Snapshot the value */
1081 matched = sed_cmd->in_match;
1082
1083 dbg("cmd:'%c' matched:%d beg_line:%d end_line:%d linenum:%d",
1084 sed_cmd->cmd, matched, sed_cmd->beg_line, sed_cmd->end_line, linenum);
1085
1086 /* Is this line the end of the current match? */
1087
1088 if (matched) {
1089 /* once matched, "n,xxx" range is dead, disabling it */
1090 if (sed_cmd->beg_line > 0) {
1091 sed_cmd->beg_line = -2;
1092 }
1093 sed_cmd->in_match = !(
1094 /* has the ending line come, or is this a single address command? */
1095 (sed_cmd->end_line
1096 ? sed_cmd->end_line == -1
1097 ? !next_line
1098 : (sed_cmd->end_line <= linenum)
1099 : !sed_cmd->end_match
1100 )
1101 /* or does this line matches our last address regex */
1102 || (sed_cmd->end_match && old_matched
1103 && (regexec(sed_cmd->end_match,
1104 pattern_space, 0, NULL, 0) == 0)
1105 )
1106 );
1107 }
1108
1109 /* Skip blocks of commands we didn't match */
1110 if (sed_cmd->cmd == '{') {
1111 if (sed_cmd->invert ? matched : !matched) {
1112 unsigned nest_cnt = 0;
1113 while (1) {
1114 if (sed_cmd->cmd == '{')
1115 nest_cnt++;
1116 if (sed_cmd->cmd == '}') {
1117 nest_cnt--;
1118 if (nest_cnt == 0)
1119 break;
1120 }
1121 sed_cmd = sed_cmd->next;
1122 if (!sed_cmd)
1123 bb_error_msg_and_die("unterminated {");
1124 }
1125 }
1126 continue;
1127 }
1128
1129 /* Okay, so did this line match? */
1130 if (sed_cmd->invert ? matched : !matched)
1131 continue; /* no */
1132
1133 /* Update last used regex in case a blank substitute BRE is found */
1134 if (sed_cmd->beg_match) {
1135 G.previous_regex_ptr = sed_cmd->beg_match;
1136 }
1137
1138 /* actual sedding */
1139 dbg("pattern_space:'%s' next_line:'%s' cmd:%c",
1140 pattern_space, next_line, sed_cmd->cmd);
1141 switch (sed_cmd->cmd) {
1142
1143 /* Print line number */
1144 case '=':
1145 fprintf(G.nonstdout, "%d\n", linenum);
1146 break;
1147
1148 /* Write the current pattern space up to the first newline */
1149 case 'P':
1150 {
1151 char *tmp = strchr(pattern_space, '\n');
1152 if (tmp) {
1153 *tmp = '\0';
1154 /* TODO: explain why '\n' below */
1155 sed_puts(pattern_space, '\n');
1156 *tmp = '\n';
1157 break;
1158 }
1159 /* Fall Through */
1160 }
1161
1162 /* Write the current pattern space to output */
1163 case 'p':
1164 /* NB: we print this _before_ the last line
1165 * (of current file) is printed. Even if
1166 * that line is nonterminated, we print
1167 * '\n' here (gnu sed does the same) */
1168 sed_puts(pattern_space, '\n');
1169 break;
1170 /* Delete up through first newline */
1171 case 'D':
1172 {
1173 char *tmp = strchr(pattern_space, '\n');
1174 if (tmp) {
1175 overlapping_strcpy(pattern_space, tmp + 1);
1176 goto restart;
1177 }
1178 }
1179 /* discard this line. */
1180 case 'd':
1181 goto discard_line;
1182
1183 /* Substitute with regex */
1184 case 's':
1185 if (!do_subst_command(sed_cmd, &pattern_space))
1186 break;
1187 dbg("do_subst_command succeeded:'%s'", pattern_space);
1188 substituted |= 1;
1189
1190 /* handle p option */
1191 if (sed_cmd->sub_p)
1192 sed_puts(pattern_space, last_gets_char);
1193 /* handle w option */
1194 if (sed_cmd->sw_file)
1195 puts_maybe_newline(
1196 pattern_space, sed_cmd->sw_file,
1197 &sed_cmd->sw_last_char, last_gets_char);
1198 break;
1199
1200 /* Append line to linked list to be printed later */
1201 case 'a':
1202 append(xstrdup(sed_cmd->string));
1203 break;
1204
1205 /* Insert text before this line */
1206 case 'i':
1207 sed_puts(sed_cmd->string, '\n');
1208 break;
1209
1210 /* Cut and paste text (replace) */
1211 case 'c':
1212 /* Only triggers on last line of a matching range. */
1213 if (!sed_cmd->in_match)
1214 sed_puts(sed_cmd->string, '\n');
1215 goto discard_line;
1216
1217 /* Read file, append contents to output */
1218 case 'r':
1219 {
1220 FILE *rfile;
1221 rfile = fopen_for_read(sed_cmd->string);
1222 if (rfile) {
1223 char *line;
1224 while ((line = xmalloc_fgetline(rfile))
1225 != NULL)
1226 append(line);
1227 fclose(rfile);
1228 }
1229
1230 break;
1231 }
1232
1233 /* Write pattern space to file. */
1234 case 'w':
1235 puts_maybe_newline(
1236 pattern_space, sed_cmd->sw_file,
1237 &sed_cmd->sw_last_char, last_gets_char);
1238 break;
1239
1240 /* Read next line from input */
1241 case 'n':
1242 if (!G.be_quiet)
1243 sed_puts(pattern_space, last_gets_char);
1244 if (next_line) {
1245 free(pattern_space);
1246 pattern_space = next_line;
1247 last_gets_char = next_gets_char;
1248 next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char);
1249 substituted = 0;
1250 linenum++;
1251 break;
1252 }
1253 /* fall through */
1254
1255 /* Quit. End of script, end of input. */
1256 case 'q':
1257 /* Exit the outer while loop */
1258 free(next_line);
1259 next_line = NULL;
1260 goto discard_commands;
1261
1262 /* Append the next line to the current line */
1263 case 'N':
1264 {
1265 int len;
1266 /* If no next line, jump to end of script and exit. */
1267 /* http://www.gnu.org/software/sed/manual/sed.html:
1268 * "Most versions of sed exit without printing anything
1269 * when the N command is issued on the last line of
1270 * a file. GNU sed prints pattern space before exiting
1271 * unless of course the -n command switch has been
1272 * specified. This choice is by design."
1273 */
1274 if (next_line == NULL) {
1275 //goto discard_line;
1276 goto discard_commands; /* GNU behavior */
1277 }
1278 /* Append next_line, read new next_line. */
1279 len = strlen(pattern_space);
1280 pattern_space = xrealloc(pattern_space, len + strlen(next_line) + 2);
1281 pattern_space[len] = '\n';
1282 strcpy(pattern_space + len+1, next_line);
1283 last_gets_char = next_gets_char;
1284 next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char);
1285 linenum++;
1286 break;
1287 }
1288
1289 /* Test/branch if substitution occurred */
1290 case 't':
1291 if (!substituted) break;
1292 substituted = 0;
1293 /* Fall through */
1294 /* Test/branch if substitution didn't occur */
1295 case 'T':
1296 if (substituted) break;
1297 /* Fall through */
1298 /* Branch to label */
1299 case 'b':
1300 if (!sed_cmd->string) goto discard_commands;
1301 else sed_cmd = branch_to(sed_cmd->string);
1302 break;
1303 /* Transliterate characters */
1304 case 'y':
1305 {
1306 int i, j;
1307 for (i = 0; pattern_space[i]; i++) {
1308 for (j = 0; sed_cmd->string[j]; j += 2) {
1309 if (pattern_space[i] == sed_cmd->string[j]) {
1310 pattern_space[i] = sed_cmd->string[j + 1];
1311 break;
1312 }
1313 }
1314 }
1315
1316 break;
1317 }
1318 case 'g': /* Replace pattern space with hold space */
1319 free(pattern_space);
1320 pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
1321 break;
1322 case 'G': /* Append newline and hold space to pattern space */
1323 {
1324 int pattern_space_size = 2;
1325 int hold_space_size = 0;
1326
1327 if (pattern_space)
1328 pattern_space_size += strlen(pattern_space);
1329 if (G.hold_space)
1330 hold_space_size = strlen(G.hold_space);
1331 pattern_space = xrealloc(pattern_space,
1332 pattern_space_size + hold_space_size);
1333 if (pattern_space_size == 2)
1334 pattern_space[0] = 0;
1335 strcat(pattern_space, "\n");
1336 if (G.hold_space)
1337 strcat(pattern_space, G.hold_space);
1338 last_gets_char = '\n';
1339
1340 break;
1341 }
1342 case 'h': /* Replace hold space with pattern space */
1343 free(G.hold_space);
1344 G.hold_space = xstrdup(pattern_space);
1345 break;
1346 case 'H': /* Append newline and pattern space to hold space */
1347 {
1348 int hold_space_size = 2;
1349 int pattern_space_size = 0;
1350
1351 if (G.hold_space)
1352 hold_space_size += strlen(G.hold_space);
1353 if (pattern_space)
1354 pattern_space_size = strlen(pattern_space);
1355 G.hold_space = xrealloc(G.hold_space,
1356 hold_space_size + pattern_space_size);
1357
1358 if (hold_space_size == 2)
1359 *G.hold_space = 0;
1360 strcat(G.hold_space, "\n");
1361 if (pattern_space)
1362 strcat(G.hold_space, pattern_space);
1363
1364 break;
1365 }
1366 case 'x': /* Exchange hold and pattern space */
1367 {
1368 char *tmp = pattern_space;
1369 pattern_space = G.hold_space ? G.hold_space : xzalloc(1);
1370 last_gets_char = '\n';
1371 G.hold_space = tmp;
1372 break;
1373 }
1374 } /* switch */
1375 } /* for each cmd */
1376
1377 /*
1378 * Exit point from sedding...
1379 */
1380 discard_commands:
1381 /* we will print the line unless we were told to be quiet ('-n')
1382 or if the line was suppressed (ala 'd'elete) */
1383 if (!G.be_quiet)
1384 sed_puts(pattern_space, last_gets_char);
1385
1386 /* Delete and such jump here. */
1387 discard_line:
1388 flush_append(&last_puts_char, last_gets_char);
1389 free(pattern_space);
1390
1391 goto again;
1392}
1393
1394/* It is possible to have a command line argument with embedded
1395 * newlines. This counts as multiple command lines.
1396 * However, newline can be escaped: 's/e/z\<newline>z/'
1397 * add_cmd() handles this.
1398 */
1399
1400static void add_cmd_block(char *cmdstr)
1401{
1402 char *sv, *eol;
1403
1404 cmdstr = sv = xstrdup(cmdstr);
1405 do {
1406 eol = strchr(cmdstr, '\n');
1407 if (eol)
1408 *eol = '\0';
1409 add_cmd(cmdstr);
1410 cmdstr = eol + 1;
1411 } while (eol);
1412 free(sv);
1413}
1414
1415int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1416int sed_main(int argc UNUSED_PARAM, char **argv)
1417{
1418 unsigned opt;
1419 llist_t *opt_e, *opt_f;
1420 char *opt_i;
1421
1422#if ENABLE_LONG_OPTS
1423 static const char sed_longopts[] ALIGN1 =
1424 /* name has_arg short */
1425 "in-place\0" Optional_argument "i"
1426 "regexp-extended\0" No_argument "r"
1427 "quiet\0" No_argument "n"
1428 "silent\0" No_argument "n"
1429 "expression\0" Required_argument "e"
1430 "file\0" Required_argument "f";
1431#endif
1432
1433 INIT_G();
1434
1435 /* destroy command strings on exit */
1436 if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
1437
1438 /* Lie to autoconf when it starts asking stupid questions. */
1439 if (argv[1] && strcmp(argv[1], "--version") == 0) {
1440 puts("This is not GNU sed version 4.0");
1441 return 0;
1442 }
1443
1444 /* do normal option parsing */
1445 opt_e = opt_f = NULL;
1446 opt_i = NULL;
1447 opt_complementary = "e::f::" /* can occur multiple times */
1448 "nn"; /* count -n */
1449
1450 IF_LONG_OPTS(applet_long_options = sed_longopts);
1451
1452 /* -i must be first, to match OPT_in_place definition */
1453 /* -E is a synonym of -r:
1454 * GNU sed 4.2.1 mentions it in neither --help
1455 * nor manpage, but does recognize it.
1456 */
1457 opt = getopt32(argv, "i::rEne:f:", &opt_i, &opt_e, &opt_f,
1458 &G.be_quiet); /* counter for -n */
1459 //argc -= optind;
1460 argv += optind;
1461 if (opt & OPT_in_place) { // -i
1462 atexit(cleanup_outname);
1463 }
1464 if (opt & (2|4))
1465 G.regex_type |= REG_EXTENDED; // -r or -E
1466 //if (opt & 8)
1467 // G.be_quiet++; // -n (implemented with a counter instead)
1468 while (opt_e) { // -e
1469 add_cmd_block(llist_pop(&opt_e));
1470 }
1471 while (opt_f) { // -f
1472 char *line;
1473 FILE *cmdfile;
1474 cmdfile = xfopen_for_read(llist_pop(&opt_f));
1475 while ((line = xmalloc_fgetline(cmdfile)) != NULL) {
1476 add_cmd(line);
1477 free(line);
1478 }
1479 fclose(cmdfile);
1480 }
1481 /* if we didn't get a pattern from -e or -f, use argv[0] */
1482 if (!(opt & 0x30)) {
1483 if (!*argv)
1484 bb_show_usage();
1485 add_cmd_block(*argv++);
1486 }
1487 /* Flush any unfinished commands. */
1488 add_cmd("");
1489
1490 /* By default, we write to stdout */
1491 G.nonstdout = stdout;
1492
1493 /* argv[0..(argc-1)] should be names of file to process. If no
1494 * files were specified or '-' was specified, take input from stdin.
1495 * Otherwise, we process all the files specified. */
1496 G.input_file_list = argv;
1497 if (!argv[0]) {
1498 if (opt & OPT_in_place)
1499 bb_error_msg_and_die(bb_msg_requires_arg, "-i");
1500 argv[0] = (char*)bb_msg_standard_input;
1501 /* G.last_input_file = 0; - already is */
1502 } else {
1503 goto start;
1504
1505 for (; *argv; argv++) {
1506 struct stat statbuf;
1507 int nonstdoutfd;
1508 sed_cmd_t *sed_cmd;
1509
1510 G.last_input_file++;
1511 start:
1512 if (!(opt & OPT_in_place)) {
1513 if (LONE_DASH(*argv)) {
1514 *argv = (char*)bb_msg_standard_input;
1515 process_files();
1516 }
1517 continue;
1518 }
1519
1520 /* -i: process each FILE separately: */
1521
1522 G.outname = xasprintf("%sXXXXXX", *argv);
1523 nonstdoutfd = xmkstemp(G.outname);
1524 G.nonstdout = xfdopen_for_write(nonstdoutfd);
1525
1526 /* Set permissions/owner of output file */
1527 stat(*argv, &statbuf);
1528 /* chmod'ing AFTER chown would preserve suid/sgid bits,
1529 * but GNU sed 4.2.1 does not preserve them either */
1530 fchmod(nonstdoutfd, statbuf.st_mode);
1531 fchown(nonstdoutfd, statbuf.st_uid, statbuf.st_gid);
1532
1533 process_files();
1534 fclose(G.nonstdout);
1535 G.nonstdout = stdout;
1536
1537 if (opt_i) {
1538 char *backupname = xasprintf("%s%s", *argv, opt_i);
1539 xrename(*argv, backupname);
1540 free(backupname);
1541 }
1542 /* else unlink(*argv); - rename below does this */
1543 xrename(G.outname, *argv); //TODO: rollback backup on error?
1544 free(G.outname);
1545 G.outname = NULL;
1546
1547 /* Re-enable disabled range matches */
1548 for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
1549 sed_cmd->beg_line = sed_cmd->beg_line_orig;
1550 }
1551 }
1552 /* Here, to handle "sed 'cmds' nonexistent_file" case we did:
1553 * if (G.current_input_file[G.current_input_file] == NULL)
1554 * return G.exitcode;
1555 * but it's not needed since process_files() works correctly
1556 * in this case too. */
1557 }
1558
1559 process_files();
1560
1561 return G.exitcode;
1562}
1563
generated by cgit at 2024-05-15 04:21:58 (GMT)