1 /* vi: set sw=4 ts=4: */
3 * sed.c - very minimalist version of sed
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 <bug1@iinet.net.au>
9 * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
11 * MAINTAINER: Rob Landley <rob@landley.net>
13 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
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.
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 (bbg.sed_cmd_head/bbg.sed_cmd_tail).
26 add_input_file() adds a FILE * to the list of input files. We need to
27 know all input sources ahead of time to find the last line for the $ match.
29 process_files() does actual sedding, reading data lines from each input FILE *
30 (which could be stdin) and applying the sed command list (sed_cmd_head) to
31 each of the resulting lines.
33 sed_main() is where external code calls into this, with a command line.
38 Supported features and commands in this version of sed:
41 - address matching: num|/matchstr/[,num|/matchstr/|$]command
42 - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
43 - edit commands: (a)ppend, (i)nsert, (c)hange
44 - file commands: (r)ead
45 - backreferences in substitution expressions (\0, \1, \2...\9)
46 - grouped commands: {cmd1;cmd2}
47 - transliteration (y/source-chars/dest-chars/)
48 - pattern space hold space storing / swapping (g, h, x)
49 - labels / branching (: label, b, t, T)
51 (Note: Specifying an address (range) to match is *optional*; commands
52 default to the whole pattern space if no specific address match was
56 - Create a wrapper around regex to make libc's regex conform with sed
58 Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
64 /* Each sed command turns into one of these structures. */
65 typedef struct sed_cmd_s {
66 /* Ordered by alignment requirements: currently 36 bytes on x86 */
69 regex_t *beg_match; /* sed -e '/match/cmd' */
70 regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
71 regex_t *sub_match; /* For 's/sub_match/string/' */
72 int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
73 int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
75 FILE *sw_file; /* File (sw) command writes to, -1 for none. */
76 char *string; /* Data string for (saicytb) commands. */
78 unsigned short which_match; /* (s) Which match to replace (0 for all) */
80 /* Bitfields (gcc won't group them if we don't) */
81 unsigned int invert:1; /* the '!' after the address */
82 unsigned int in_match:1; /* Next line also included in match? */
83 unsigned int sub_p:1; /* (s) print option */
85 char sw_last_char; /* Last line written by (sw) had no '\n' */
88 char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
89 struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
92 static const char *const semicolon_whitespace = "; \n\r\t\v";
96 int be_quiet, regex_type;
98 char *outname, *hold_space;
100 /* List of input files */
101 int input_file_count, current_input_file;
102 FILE **input_file_list;
104 regmatch_t regmatch[10];
105 regex_t *previous_regex_ptr;
107 /* linked list of sed commands */
108 sed_cmd_t sed_cmd_head, *sed_cmd_tail;
110 /* Linked list of append lines */
111 llist_t *append_head;
116 char *buf; /* Space to hold string */
117 int idx; /* Space used */
118 int len; /* Space allocated */
123 #if ENABLE_FEATURE_CLEAN_UP
124 static void sed_free_and_close_stuff(void)
126 sed_cmd_t *sed_cmd = bbg.sed_cmd_head.next;
128 llist_free(bbg.append_head, free);
131 sed_cmd_t *sed_cmd_next = sed_cmd->next;
133 if (sed_cmd->sw_file)
134 xprint_and_close_file(sed_cmd->sw_file);
136 if (sed_cmd->beg_match) {
137 regfree(sed_cmd->beg_match);
138 free(sed_cmd->beg_match);
140 if (sed_cmd->end_match) {
141 regfree(sed_cmd->end_match);
142 free(sed_cmd->end_match);
144 if (sed_cmd->sub_match) {
145 regfree(sed_cmd->sub_match);
146 free(sed_cmd->sub_match);
148 free(sed_cmd->string);
150 sed_cmd = sed_cmd_next;
153 if (bbg.hold_space) free(bbg.hold_space);
155 while (bbg.current_input_file < bbg.input_file_count)
156 fclose(bbg.input_file_list[bbg.current_input_file++]);
159 void sed_free_and_close_stuff(void);
162 /* If something bad happens during -i operation, delete temp file */
164 static void cleanup_outname(void)
166 if (bbg.outname) unlink(bbg.outname);
169 /* strdup, replacing "\n" with '\n', and "\delimiter" with 'delimiter' */
171 static void parse_escapes(char *dest, const char *string, int len, char from, char to)
176 if (string[i] == '\\') {
177 if (!to || string[i+1] == from) {
178 *dest++ = to ? to : string[i+1];
182 *dest++ = string[i++];
184 *dest++ = string[i++];
189 static char *copy_parsing_escapes(const char *string, int len)
191 char *dest = xmalloc(len + 1);
193 parse_escapes(dest, string, len, 'n', '\n');
199 * index_of_next_unescaped_regexp_delim - walks left to right through a string
200 * beginning at a specified index and returns the index of the next regular
201 * expression delimiter (typically a forward * slash ('/')) not preceded by
202 * a backslash ('\'). A negative delimiter disables square bracket checking.
204 static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
213 delimiter = -delimiter;
216 for (; (ch = str[idx]); idx++) {
218 if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
219 && str[idx - 1] == '^')))
225 else if (bracket == -1 && ch == '[')
227 else if (ch == delimiter)
231 /* if we make it to here, we've hit the end of the string */
232 bb_error_msg_and_die("unmatched '%c'", delimiter);
236 * Returns the index of the third delimiter
238 static int parse_regex_delim(char *cmdstr, char **match, char **replace)
240 char *cmdstr_ptr = cmdstr;
244 /* verify that the 's' or 'y' is followed by something. That something
245 * (typically a 'slash') is now our regexp delimiter... */
247 bb_error_msg_and_die("bad format in substitution expression");
248 delimiter = *cmdstr_ptr++;
250 /* save the match string */
251 idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
252 *match = copy_parsing_escapes(cmdstr_ptr, idx);
254 /* save the replacement string */
255 cmdstr_ptr += idx + 1;
256 idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
257 *replace = copy_parsing_escapes(cmdstr_ptr, idx);
259 return ((cmdstr_ptr - cmdstr) + idx);
263 * returns the index in the string just past where the address ends.
265 static int get_address(const char *my_str, int *linenum, regex_t ** regex)
267 const char *pos = my_str;
269 if (isdigit(*my_str)) {
270 *linenum = strtol(my_str, (char**)&pos, 10);
271 /* endstr shouldnt ever equal NULL */
272 } else if (*my_str == '$') {
275 } else if (*my_str == '/' || *my_str == '\\') {
281 if (*my_str == '\\') delimiter = *++pos;
282 next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
283 temp = copy_parsing_escapes(pos, next);
284 *regex = xmalloc(sizeof(regex_t));
285 xregcomp(*regex, temp, bbg.regex_type|REG_NEWLINE);
287 /* Move position to next character after last delimiter */
293 /* Grab a filename. Whitespace at start is skipped, then goes to EOL. */
294 static int parse_file_cmd(sed_cmd_t *sed_cmd, char *filecmdstr, char **retval)
296 int start = 0, idx, hack = 0;
298 /* Skip whitespace, then grab filename to end of line */
299 while (isspace(filecmdstr[start])) start++;
301 while (filecmdstr[idx] && filecmdstr[idx] != '\n') idx++;
303 /* If lines glued together, put backslash back. */
304 if (filecmdstr[idx] == '\n') hack = 1;
306 bb_error_msg_and_die("empty filename");
307 *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
308 if (hack) (*retval)[idx] = '\\';
313 static int parse_subst_cmd(sed_cmd_t *sed_cmd, char *substr)
315 int cflags = bbg.regex_type;
320 * A substitution command should look something like this:
321 * s/match/replace/ #gIpw
325 idx = parse_regex_delim(substr, &match, &sed_cmd->string);
327 /* determine the number of back references in the match string */
328 /* Note: we compute this here rather than in the do_subst_command()
329 * function to save processor time, at the expense of a little more memory
330 * (4 bits) per sed_cmd */
332 /* process the flags */
334 sed_cmd->which_match = 1;
335 while (substr[++idx]) {
336 /* Parse match number */
337 if (isdigit(substr[idx])) {
338 if (match[0] != '^') {
339 /* Match 0 treated as all, multiple matches we take the last one. */
340 char *pos = substr + idx;
341 /* FIXME: error check? */
342 sed_cmd->which_match = (unsigned short)strtol(substr+idx, &pos, 10);
348 if (isspace(substr[idx])) continue;
350 switch (substr[idx]) {
351 /* Replace all occurrences */
353 if (match[0] != '^') sed_cmd->which_match = 0;
355 /* Print pattern space */
363 idx += parse_file_cmd(sed_cmd, substr+idx, &temp);
367 /* Ignore case (gnu exension) */
373 while (substr[++idx]) /*skip all*/;
380 bb_error_msg_and_die("bad option in substitution expression");
384 /* compile the match string into a regex */
385 if (*match != '\0') {
386 /* If match is empty, we use last regex used at runtime */
387 sed_cmd->sub_match = xmalloc(sizeof(regex_t));
388 xregcomp(sed_cmd->sub_match, match, cflags);
396 * Process the commands arguments
398 static char *parse_cmd_args(sed_cmd_t *sed_cmd, char *cmdstr)
400 /* handle (s)ubstitution command */
401 if (sed_cmd->cmd == 's')
402 cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
403 /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
404 else if (strchr("aic", sed_cmd->cmd)) {
405 if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
407 ("only a beginning address can be specified for edit commands");
409 if (*cmdstr == '\n' || *cmdstr == '\\') {
412 } else if (isspace(*cmdstr))
417 sed_cmd->string = xstrdup(cmdstr);
418 parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), 0, 0);
419 cmdstr += strlen(cmdstr);
420 /* handle file cmds: (r)ead */
421 } else if (strchr("rw", sed_cmd->cmd)) {
422 if (sed_cmd->end_line || sed_cmd->end_match)
423 bb_error_msg_and_die("command only uses one address");
424 cmdstr += parse_file_cmd(sed_cmd, cmdstr, &sed_cmd->string);
425 if (sed_cmd->cmd == 'w') {
426 sed_cmd->sw_file = xfopen(sed_cmd->string, "w");
427 sed_cmd->sw_last_char = '\n';
429 /* handle branch commands */
430 } else if (strchr(":btT", sed_cmd->cmd)) {
433 cmdstr = skip_whitespace(cmdstr);
434 length = strcspn(cmdstr, semicolon_whitespace);
436 sed_cmd->string = xstrndup(cmdstr, length);
440 /* translation command */
441 else if (sed_cmd->cmd == 'y') {
442 char *match, *replace;
445 cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
446 /* \n already parsed, but \delimiter needs unescaping. */
447 parse_escapes(match, match, strlen(match), i, i);
448 parse_escapes(replace, replace, strlen(replace), i, i);
450 sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
451 for (i = 0; match[i] && replace[i]; i++) {
452 sed_cmd->string[i*2] = match[i];
453 sed_cmd->string[i*2+1] = replace[i];
458 /* if it wasnt a single-letter command that takes no arguments
459 * then it must be an invalid command.
461 else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
462 bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
465 /* give back whatever's left over */
470 /* Parse address+command sets, skipping comment lines. */
472 static void add_cmd(const char *cmdstr)
477 /* Append this line to any unfinished line from last time. */
478 if (bbg.add_cmd_line) {
479 char *tp = xasprintf("%s\n%s", bbg.add_cmd_line, cmdstr);
480 free(bbg.add_cmd_line);
481 bbg.add_cmd_line = tp;
484 /* If this line ends with backslash, request next line. */
485 temp = strlen(cmdstr);
486 if (temp && cmdstr[temp-1] == '\\') {
487 if (!bbg.add_cmd_line)
488 bbg.add_cmd_line = xstrdup(cmdstr);
489 bbg.add_cmd_line[temp-1] = 0;
493 /* Loop parsing all commands in this line. */
495 /* Skip leading whitespace and semicolons */
496 cmdstr += strspn(cmdstr, semicolon_whitespace);
498 /* If no more commands, exit. */
501 /* if this is a comment, jump past it and keep going */
502 if (*cmdstr == '#') {
503 /* "#n" is the same as using -n on the command line */
504 if (cmdstr[1] == 'n')
506 cmdstr = strpbrk(cmdstr, "\n\r");
512 * format is: [addr][,addr][!]cmd
517 sed_cmd = xzalloc(sizeof(sed_cmd_t));
519 /* first part (if present) is an address: either a '$', a number or a /regex/ */
520 cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
522 /* second part (if present) will begin with a comma */
523 if (*cmdstr == ',') {
527 idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
529 bb_error_msg_and_die("no address after comma");
533 /* skip whitespace before the command */
534 cmdstr = skip_whitespace(cmdstr);
536 /* Check for inversion flag */
537 if (*cmdstr == '!') {
541 /* skip whitespace before the command */
542 cmdstr = skip_whitespace(cmdstr);
545 /* last part (mandatory) will be a command */
547 bb_error_msg_and_die("missing command");
548 sed_cmd->cmd = *(cmdstr++);
549 cmdstr = parse_cmd_args(sed_cmd, cmdstr);
551 /* Add the command to the command array */
552 bbg.sed_cmd_tail->next = sed_cmd;
553 bbg.sed_cmd_tail = bbg.sed_cmd_tail->next;
556 /* If we glued multiple lines together, free the memory. */
557 free(bbg.add_cmd_line);
558 bbg.add_cmd_line = NULL;
561 /* Append to a string, reallocating memory as necessary. */
565 static void pipe_putc(char c)
567 if (bbg.pipeline.idx == bbg.pipeline.len) {
568 bbg.pipeline.buf = xrealloc(bbg.pipeline.buf,
569 bbg.pipeline.len + PIPE_GROW);
570 bbg.pipeline.len += PIPE_GROW;
572 bbg.pipeline.buf[bbg.pipeline.idx++] = c;
575 static void do_subst_w_backrefs(char *line, char *replace)
579 /* go through the replacement string */
580 for (i = 0; replace[i]; i++) {
581 /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
582 if (replace[i] == '\\') {
583 unsigned backref = replace[++i] - '0';
585 /* print out the text held in bbg.regmatch[backref] */
586 if (bbg.regmatch[backref].rm_so != -1) {
587 j = bbg.regmatch[backref].rm_so;
588 while (j < bbg.regmatch[backref].rm_eo)
589 pipe_putc(line[j++]);
593 /* I _think_ it is impossible to get '\' to be
594 * the last char in replace string. Thus we dont check
595 * for replace[i] == NUL. (counterexample anyone?) */
596 /* if we find a backslash escaped character, print the character */
597 pipe_putc(replace[i]);
600 /* if we find an unescaped '&' print out the whole matched text. */
601 if (replace[i] == '&') {
602 j = bbg.regmatch[0].rm_so;
603 while (j < bbg.regmatch[0].rm_eo)
604 pipe_putc(line[j++]);
607 /* Otherwise just output the character. */
608 pipe_putc(replace[i]);
612 static int do_subst_command(sed_cmd_t *sed_cmd, char **line)
614 char *oldline = *line;
617 regex_t *current_regex;
619 /* Handle empty regex. */
620 if (sed_cmd->sub_match == NULL) {
621 current_regex = bbg.previous_regex_ptr;
623 bb_error_msg_and_die("no previous regexp");
625 bbg.previous_regex_ptr = current_regex = sed_cmd->sub_match;
627 /* Find the first match */
628 if (REG_NOMATCH == regexec(current_regex, oldline, 10, bbg.regmatch, 0))
631 /* Initialize temporary output buffer. */
632 bbg.pipeline.buf = xmalloc(PIPE_GROW);
633 bbg.pipeline.len = PIPE_GROW;
634 bbg.pipeline.idx = 0;
636 /* Now loop through, substituting for matches */
640 /* Work around bug in glibc regexec, demonstrated by:
641 echo " a.b" | busybox sed 's [^ .]* x g'
642 The match_count check is so not to break
643 echo "hi" | busybox sed 's/^/!/g' */
644 if (!bbg.regmatch[0].rm_so && !bbg.regmatch[0].rm_eo && match_count) {
645 pipe_putc(*oldline++);
651 /* If we aren't interested in this match, output old line to
652 end of match and continue */
653 if (sed_cmd->which_match && sed_cmd->which_match != match_count) {
654 for (i = 0; i < bbg.regmatch[0].rm_eo; i++)
655 pipe_putc(*oldline++);
659 /* print everything before the match */
660 for (i = 0; i < bbg.regmatch[0].rm_so; i++)
661 pipe_putc(oldline[i]);
663 /* then print the substitution string */
664 do_subst_w_backrefs(oldline, sed_cmd->string);
666 /* advance past the match */
667 oldline += bbg.regmatch[0].rm_eo;
668 /* flag that something has changed */
671 /* if we're not doing this globally, get out now */
672 if (sed_cmd->which_match) break;
673 } while (*oldline && (regexec(current_regex, oldline, 10, bbg.regmatch, 0) != REG_NOMATCH));
675 /* Copy rest of string into output pipeline */
678 pipe_putc(*oldline++);
682 *line = bbg.pipeline.buf;
686 /* Set command pointer to point to this label. (Does not handle null label.) */
687 static sed_cmd_t *branch_to(char *label)
691 for (sed_cmd = bbg.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
692 if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
696 bb_error_msg_and_die("can't find label for jump to '%s'", label);
699 static void append(char *s)
701 llist_add_to_end(&bbg.append_head, xstrdup(s));
704 static void flush_append(void)
708 /* Output appended lines. */
709 while ((data = (char *)llist_pop(&bbg.append_head))) {
710 fprintf(bbg.nonstdout, "%s\n", data);
715 static void add_input_file(FILE *file)
717 bbg.input_file_list = xrealloc(bbg.input_file_list,
718 (bbg.input_file_count + 1) * sizeof(FILE *));
719 bbg.input_file_list[bbg.input_file_count++] = file;
722 /* Get next line of input from bbg.input_file_list, flushing append buffer and
723 * noting if we ran out of files without a newline on the last line we read.
729 static char *get_next_line(char *gets_char)
737 /* will be returned if last line in the file
738 * doesn't end with either '\n' or '\0' */
740 while (bbg.current_input_file < bbg.input_file_count) {
741 FILE *fp = bbg.input_file_list[bbg.current_input_file];
742 /* Read line up to a newline or NUL byte, inclusive,
743 * return malloc'ed char[]. length of the chunk read
744 * is stored in len. NULL if EOF/error */
745 temp = bb_get_chunk_from_file(fp, &len);
747 /* len > 0 here, it's ok to do temp[len-1] */
748 char c = temp[len-1];
749 if (c == '\n' || c == '\0') {
760 /* else we put NO_EOL_CHAR into *gets_char */
763 /* NB: I had the idea of peeking next file(s) and returning
764 * NO_EOL_CHAR only if it is the *last* non-empty
765 * input file. But there is a case where this won't work:
766 * file1: "a woo\nb woo"
767 * file2: "c no\nd no"
768 * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
769 * (note: *no* newline after "b bang"!) */
771 /* Close this file and advance to next one */
773 bbg.current_input_file++;
779 /* Output line of text. */
781 * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
782 * Without them, we had this:
786 * sed "s/i/z/" z1 z2 znull | hexdump -vC
789 * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn|
791 * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn|
793 static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
795 char lpc = *last_puts_char;
797 /* Need to insert a '\n' between two files because first file's
798 * last line wasn't terminated? */
799 if (lpc != '\n' && lpc != '\0') {
805 /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
809 /* had trailing '\0' and it was last char of file? */
810 if (last_gets_char == LAST_IS_NUL) {
814 /* had trailing '\n' or '\0'? */
815 if (last_gets_char != NO_EOL_CHAR) {
816 fputc(last_gets_char, file);
817 lpc = last_gets_char;
821 xfunc_error_retval = 4; /* It's what gnu sed exits with... */
822 bb_error_msg_and_die(bb_msg_write_error);
824 *last_puts_char = lpc;
827 #define sed_puts(s, n) (puts_maybe_newline(s, bbg.nonstdout, &last_puts_char, n))
829 /* Process all the lines in all the files */
831 static void process_files(void)
833 char *pattern_space, *next_line;
835 char last_puts_char = '\n';
836 char last_gets_char, next_gets_char;
841 next_line = get_next_line(&next_gets_char);
843 /* go through every line in each file */
847 /* Advance to next line. Stop if out of lines. */
848 pattern_space = next_line;
849 if (!pattern_space) return;
850 last_gets_char = next_gets_char;
852 /* Read one line in advance so we can act on the last line,
854 next_line = get_next_line(&next_gets_char);
857 /* for every line, go through all the commands */
858 for (sed_cmd = bbg.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
859 int old_matched, matched;
861 old_matched = sed_cmd->in_match;
863 /* Determine if this command matches this line: */
865 /* Are we continuing a previous multi-line match? */
866 sed_cmd->in_match = sed_cmd->in_match
867 /* Or is no range necessary? */
868 || (!sed_cmd->beg_line && !sed_cmd->end_line
869 && !sed_cmd->beg_match && !sed_cmd->end_match)
870 /* Or did we match the start of a numerical range? */
871 || (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum))
872 /* Or does this line match our begin address regex? */
873 || (sed_cmd->beg_match &&
874 !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0))
875 /* Or did we match last line of input? */
876 || (sed_cmd->beg_line == -1 && next_line == NULL);
878 /* Snapshot the value */
880 matched = sed_cmd->in_match;
882 /* Is this line the end of the current match? */
885 sed_cmd->in_match = !(
886 /* has the ending line come, or is this a single address command? */
888 sed_cmd->end_line == -1 ?
890 : (sed_cmd->end_line <= linenum)
891 : !sed_cmd->end_match
893 /* or does this line matches our last address regex */
894 || (sed_cmd->end_match && old_matched
895 && (regexec(sed_cmd->end_match,
896 pattern_space, 0, NULL, 0) == 0))
900 /* Skip blocks of commands we didn't match. */
901 if (sed_cmd->cmd == '{') {
902 if (sed_cmd->invert ? matched : !matched) {
903 while (sed_cmd->cmd != '}') {
904 sed_cmd = sed_cmd->next;
906 bb_error_msg_and_die("unterminated {");
912 /* Okay, so did this line match? */
913 if (sed_cmd->invert ? !matched : matched) {
914 /* Update last used regex in case a blank substitute BRE is found */
915 if (sed_cmd->beg_match) {
916 bbg.previous_regex_ptr = sed_cmd->beg_match;
920 switch (sed_cmd->cmd) {
922 /* Print line number */
924 fprintf(bbg.nonstdout, "%d\n", linenum);
927 /* Write the current pattern space up to the first newline */
930 char *tmp = strchr(pattern_space, '\n');
934 /* TODO: explain why '\n' below */
935 sed_puts(pattern_space, '\n');
942 /* Write the current pattern space to output */
944 /* NB: we print this _before_ the last line
945 * (of current file) is printed. Even if
946 * that line is nonterminated, we print
947 * '\n' here (gnu sed does the same) */
948 sed_puts(pattern_space, '\n');
950 /* Delete up through first newline */
953 char *tmp = strchr(pattern_space, '\n');
956 tmp = xstrdup(tmp+1);
962 /* discard this line. */
966 /* Substitute with regex */
968 if (!do_subst_command(sed_cmd, &pattern_space))
972 /* handle p option */
974 sed_puts(pattern_space, last_gets_char);
975 /* handle w option */
976 if (sed_cmd->sw_file)
978 pattern_space, sed_cmd->sw_file,
979 &sed_cmd->sw_last_char, last_gets_char);
982 /* Append line to linked list to be printed later */
984 append(sed_cmd->string);
987 /* Insert text before this line */
989 sed_puts(sed_cmd->string, '\n');
992 /* Cut and paste text (replace) */
994 /* Only triggers on last line of a matching range. */
995 if (!sed_cmd->in_match)
996 sed_puts(sed_cmd->string, NO_EOL_CHAR);
999 /* Read file, append contents to output */
1004 rfile = fopen(sed_cmd->string, "r");
1008 while ((line = xmalloc_getline(rfile))
1011 xprint_and_close_file(rfile);
1017 /* Write pattern space to file. */
1020 pattern_space, sed_cmd->sw_file,
1021 &sed_cmd->sw_last_char, last_gets_char);
1024 /* Read next line from input */
1027 sed_puts(pattern_space, last_gets_char);
1029 free(pattern_space);
1030 pattern_space = next_line;
1031 last_gets_char = next_gets_char;
1032 next_line = get_next_line(&next_gets_char);
1038 /* Quit. End of script, end of input. */
1040 /* Exit the outer while loop */
1043 goto discard_commands;
1045 /* Append the next line to the current line */
1049 /* If no next line, jump to end of script and exit. */
1050 if (next_line == NULL) {
1051 /* Jump to end of script and exit */
1055 /* append next_line, read new next_line. */
1057 len = strlen(pattern_space);
1058 pattern_space = realloc(pattern_space, len + strlen(next_line) + 2);
1059 pattern_space[len] = '\n';
1060 strcpy(pattern_space + len+1, next_line);
1061 last_gets_char = next_gets_char;
1062 next_line = get_next_line(&next_gets_char);
1067 /* Test/branch if substitution occurred */
1069 if (!substituted) break;
1072 /* Test/branch if substitution didn't occur */
1074 if (substituted) break;
1076 /* Branch to label */
1078 if (!sed_cmd->string) goto discard_commands;
1079 else sed_cmd = branch_to(sed_cmd->string);
1081 /* Transliterate characters */
1086 for (i = 0; pattern_space[i]; i++) {
1087 for (j = 0; sed_cmd->string[j]; j += 2) {
1088 if (pattern_space[i] == sed_cmd->string[j]) {
1089 pattern_space[i] = sed_cmd->string[j + 1];
1097 case 'g': /* Replace pattern space with hold space */
1098 free(pattern_space);
1099 pattern_space = xstrdup(bbg.hold_space ? bbg.hold_space : "");
1101 case 'G': /* Append newline and hold space to pattern space */
1103 int pattern_space_size = 2;
1104 int hold_space_size = 0;
1107 pattern_space_size += strlen(pattern_space);
1109 hold_space_size = strlen(bbg.hold_space);
1110 pattern_space = xrealloc(pattern_space,
1111 pattern_space_size + hold_space_size);
1112 if (pattern_space_size == 2)
1113 pattern_space[0] = 0;
1114 strcat(pattern_space, "\n");
1116 strcat(pattern_space, bbg.hold_space);
1117 last_gets_char = '\n';
1121 case 'h': /* Replace hold space with pattern space */
1122 free(bbg.hold_space);
1123 bbg.hold_space = xstrdup(pattern_space);
1125 case 'H': /* Append newline and pattern space to hold space */
1127 int hold_space_size = 2;
1128 int pattern_space_size = 0;
1131 hold_space_size += strlen(bbg.hold_space);
1133 pattern_space_size = strlen(pattern_space);
1134 bbg.hold_space = xrealloc(bbg.hold_space,
1135 hold_space_size + pattern_space_size);
1137 if (hold_space_size == 2)
1138 *bbg.hold_space = 0;
1139 strcat(bbg.hold_space, "\n");
1141 strcat(bbg.hold_space, pattern_space);
1145 case 'x': /* Exchange hold and pattern space */
1147 char *tmp = pattern_space;
1148 pattern_space = bbg.hold_space ? : xzalloc(1);
1149 last_gets_char = '\n';
1150 bbg.hold_space = tmp;
1158 * exit point from sedding...
1161 /* we will print the line unless we were told to be quiet ('-n')
1162 or if the line was suppressed (ala 'd'elete) */
1164 sed_puts(pattern_space, last_gets_char);
1166 /* Delete and such jump here. */
1169 free(pattern_space);
1174 /* It is possible to have a command line argument with embedded
1175 newlines. This counts as multiple command lines. */
1177 static void add_cmd_block(char *cmdstr)
1180 char *temp = xstrdup(cmdstr), *temp2 = temp;
1183 int len = strcspn(temp2, "\n");
1184 if (!temp2[len]) go = 0;
1185 else temp2[len] = 0;
1192 static void add_cmds_link(llist_t *opt_e)
1195 add_cmds_link(opt_e->link);
1196 add_cmd_block(opt_e->data);
1200 static void add_files_link(llist_t *opt_f)
1205 add_files_link(opt_f->link);
1206 cmdfile = xfopen(opt_f->data, "r");
1207 while ((line = xmalloc_getline(cmdfile)) != NULL) {
1211 xprint_and_close_file(cmdfile);
1215 int sed_main(int argc, char **argv)
1218 OPT_in_place = 1 << 0,
1221 llist_t *opt_e, *opt_f;
1222 int status = EXIT_SUCCESS;
1224 bbg.sed_cmd_tail = &bbg.sed_cmd_head;
1226 /* destroy command strings on exit */
1227 if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
1229 /* Lie to autoconf when it starts asking stupid questions. */
1230 if (argc == 2 && !strcmp(argv[1], "--version")) {
1231 puts("This is not GNU sed version 4.0");
1235 /* do normal option parsing */
1236 opt_e = opt_f = NULL;
1237 opt_complementary = "e::f::" /* can occur multiple times */
1238 "nn"; /* count -n */
1239 opt = getopt32(argc, argv, "irne:f:", &opt_e, &opt_f,
1240 &bbg.be_quiet); /* counter for -n */
1243 if (opt & OPT_in_place) { // -i
1244 atexit(cleanup_outname);
1246 if (opt & 0x2) bbg.regex_type |= REG_EXTENDED; // -r
1247 //if (opt & 0x4) bbg.be_quiet++; // -n
1248 if (opt & 0x8) { // -e
1249 /* getopt32 reverses order of arguments, handle it */
1250 add_cmds_link(opt_e);
1252 if (opt & 0x10) { // -f
1253 /* getopt32 reverses order of arguments, handle it */
1254 add_files_link(opt_f);
1256 /* if we didn't get a pattern from -e or -f, use argv[0] */
1257 if (!(opt & 0x18)) {
1260 add_cmd_block(*argv++);
1263 /* Flush any unfinished commands. */
1266 /* By default, we write to stdout */
1267 bbg.nonstdout = stdout;
1269 /* argv[0..(argc-1)] should be names of file to process. If no
1270 * files were specified or '-' was specified, take input from stdin.
1271 * Otherwise, we process all the files specified. */
1272 if (argv[0] == NULL) {
1273 if (opt & OPT_in_place)
1274 bb_error_msg_and_die(bb_msg_requires_arg, "-i");
1275 add_input_file(stdin);
1281 for (i = 0; i < argc; i++) {
1282 struct stat statbuf;
1285 if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
1286 add_input_file(stdin);
1290 file = fopen_or_warn(argv[i], "r");
1292 status = EXIT_FAILURE;
1295 if (!(opt & OPT_in_place)) {
1296 add_input_file(file);
1300 bbg.outname = xasprintf("%sXXXXXX", argv[i]);
1301 nonstdoutfd = mkstemp(bbg.outname);
1302 if (-1 == nonstdoutfd)
1303 bb_error_msg_and_die("no temp file");
1304 bbg.nonstdout = fdopen(nonstdoutfd, "w");
1306 /* Set permissions of output file */
1308 fstat(fileno(file), &statbuf);
1309 fchmod(nonstdoutfd, statbuf.st_mode);
1310 add_input_file(file);
1312 fclose(bbg.nonstdout);
1314 bbg.nonstdout = stdout;
1315 /* unlink(argv[i]); */
1316 // FIXME: error check / message?
1317 rename(bbg.outname, argv[i]);
1321 if (bbg.input_file_count > bbg.current_input_file)