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
9 * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
11 * MAINTAINER: Rob Landley <rob@landley.net>
13 * Licensed under GPLv2, see file LICENSE in this source tree.
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 * (G.sed_cmd_head/G.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.
36 /* Supported features and commands in this version of sed:
39 * - address matching: num|/matchstr/[,num|/matchstr/|$]command
40 * - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
41 * - edit commands: (a)ppend, (i)nsert, (c)hange
42 * - file commands: (r)ead
43 * - backreferences in substitution expressions (\0, \1, \2...\9)
44 * - grouped commands: {cmd1;cmd2}
45 * - transliteration (y/source-chars/dest-chars/)
46 * - pattern space hold space storing / swapping (g, h, x)
47 * - labels / branching (: label, b, t, T)
49 * (Note: Specifying an address (range) to match is *optional*; commands
50 * default to the whole pattern space if no specific address match was
54 * - Create a wrapper around regex to make libc's regex conform with sed
56 * Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
59 //usage:#define sed_trivial_usage
60 //usage: "[-inr] [-f FILE]... [-e CMD]... [FILE]...\n"
61 //usage: "or: sed [-inr] CMD [FILE]..."
62 //usage:#define sed_full_usage "\n\n"
63 //usage: " -e CMD Add CMD to sed commands to be executed"
64 //usage: "\n -f FILE Add FILE contents to sed commands to be executed"
65 //usage: "\n -i Edit files in-place (else sends result to stdout)"
66 //usage: "\n -n Suppress automatic printing of pattern space"
67 //usage: "\n -r Use extended regex syntax"
69 //usage: "\nIf no -e or -f, the first non-option argument is the sed command string."
70 //usage: "\nRemaining arguments are input files (stdin if none)."
72 //usage:#define sed_example_usage
73 //usage: "$ echo \"foo\" | sed -e 's/f[a-zA-Z]o/bar/g'\n"
80 # define dbg(...) bb_error_msg(__VA_ARGS__)
82 # define dbg(...) ((void)0)
87 OPT_in_place = 1 << 0,
90 /* Each sed command turns into one of these structures. */
91 typedef struct sed_cmd_s {
92 /* Ordered by alignment requirements: currently 36 bytes on x86 */
93 struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
96 regex_t *beg_match; /* sed -e '/match/cmd' */
97 regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
98 regex_t *sub_match; /* For 's/sub_match/string/' */
99 int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
100 int beg_line_orig; /* copy of the above, needed for -i */
101 int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
103 FILE *sw_file; /* File (sw) command writes to, -1 for none. */
104 char *string; /* Data string for (saicytb) commands. */
106 unsigned which_match; /* (s) Which match to replace (0 for all) */
108 /* Bitfields (gcc won't group them if we don't) */
109 unsigned invert:1; /* the '!' after the address */
110 unsigned in_match:1; /* Next line also included in match? */
111 unsigned sub_p:1; /* (s) print option */
113 char sw_last_char; /* Last line written by (sw) had no '\n' */
116 char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
119 static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
123 int be_quiet, regex_type;
125 char *outname, *hold_space;
127 /* List of input files */
128 int input_file_count, current_input_file;
129 FILE **input_file_list;
131 regmatch_t regmatch[10];
132 regex_t *previous_regex_ptr;
134 /* linked list of sed commands */
135 sed_cmd_t *sed_cmd_head, **sed_cmd_tail;
137 /* Linked list of append lines */
138 llist_t *append_head;
143 char *buf; /* Space to hold string */
144 int idx; /* Space used */
145 int len; /* Space allocated */
148 #define G (*(struct globals*)&bb_common_bufsiz1)
149 struct BUG_G_too_big {
150 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
152 #define INIT_G() do { \
153 G.sed_cmd_tail = &G.sed_cmd_head; \
157 #if ENABLE_FEATURE_CLEAN_UP
158 static void sed_free_and_close_stuff(void)
160 sed_cmd_t *sed_cmd = G.sed_cmd_head;
162 llist_free(G.append_head, free);
165 sed_cmd_t *sed_cmd_next = sed_cmd->next;
167 if (sed_cmd->sw_file)
168 xprint_and_close_file(sed_cmd->sw_file);
170 if (sed_cmd->beg_match) {
171 regfree(sed_cmd->beg_match);
172 free(sed_cmd->beg_match);
174 if (sed_cmd->end_match) {
175 regfree(sed_cmd->end_match);
176 free(sed_cmd->end_match);
178 if (sed_cmd->sub_match) {
179 regfree(sed_cmd->sub_match);
180 free(sed_cmd->sub_match);
182 free(sed_cmd->string);
184 sed_cmd = sed_cmd_next;
189 while (G.current_input_file < G.input_file_count)
190 fclose(G.input_file_list[G.current_input_file++]);
193 void sed_free_and_close_stuff(void);
196 /* If something bad happens during -i operation, delete temp file */
198 static void cleanup_outname(void)
200 if (G.outname) unlink(G.outname);
203 /* strcpy, replacing "\from" with 'to'. If to is NUL, replacing "\any" with 'any' */
205 static void parse_escapes(char *dest, const char *string, int len, char from, char to)
210 if (string[i] == '\\') {
211 if (!to || string[i+1] == from) {
212 *dest++ = to ? to : string[i+1];
216 *dest++ = string[i++];
218 /* TODO: is it safe wrt a string with trailing '\\' ? */
219 *dest++ = string[i++];
224 static char *copy_parsing_escapes(const char *string, int len)
227 char *dest = xmalloc(len + 1);
229 /* sed recognizes \n */
230 /* GNU sed also recognizes \t and \r */
231 for (s = "\nn\tt\rr"; *s; s += 2) {
232 parse_escapes(dest, string, len, s[1], s[0]);
241 * index_of_next_unescaped_regexp_delim - walks left to right through a string
242 * beginning at a specified index and returns the index of the next regular
243 * expression delimiter (typically a forward slash ('/')) not preceded by
244 * a backslash ('\'). A negative delimiter disables square bracket checking.
246 static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
255 delimiter = -delimiter;
258 for (; (ch = str[idx]) != '\0'; idx++) {
261 && !(bracket == idx - 1 || (bracket == idx - 2 && str[idx - 1] == '^'))
269 else if (bracket == -1 && ch == '[')
271 else if (ch == delimiter)
275 /* if we make it to here, we've hit the end of the string */
276 bb_error_msg_and_die("unmatched '%c'", delimiter);
280 * Returns the index of the third delimiter
282 static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
284 const char *cmdstr_ptr = cmdstr;
285 unsigned char delimiter;
288 /* verify that the 's' or 'y' is followed by something. That something
289 * (typically a 'slash') is now our regexp delimiter... */
291 bb_error_msg_and_die("bad format in substitution expression");
292 delimiter = *cmdstr_ptr++;
294 /* save the match string */
295 idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
296 *match = copy_parsing_escapes(cmdstr_ptr, idx);
298 /* save the replacement string */
299 cmdstr_ptr += idx + 1;
300 idx = index_of_next_unescaped_regexp_delim(- (int)delimiter, cmdstr_ptr);
301 *replace = copy_parsing_escapes(cmdstr_ptr, idx);
303 return ((cmdstr_ptr - cmdstr) + idx);
307 * returns the index in the string just past where the address ends.
309 static int get_address(const char *my_str, int *linenum, regex_t ** regex)
311 const char *pos = my_str;
313 if (isdigit(*my_str)) {
314 *linenum = strtol(my_str, (char**)&pos, 10);
315 /* endstr shouldnt ever equal NULL */
316 } else if (*my_str == '$') {
319 } else if (*my_str == '/' || *my_str == '\\') {
327 next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
328 temp = copy_parsing_escapes(pos, next);
329 *regex = xzalloc(sizeof(regex_t));
330 xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
332 /* Move position to next character after last delimiter */
338 /* Grab a filename. Whitespace at start is skipped, then goes to EOL. */
339 static int parse_file_cmd(/*sed_cmd_t *sed_cmd,*/ const char *filecmdstr, char **retval)
341 int start = 0, idx, hack = 0;
343 /* Skip whitespace, then grab filename to end of line */
344 while (isspace(filecmdstr[start]))
347 while (filecmdstr[idx] && filecmdstr[idx] != '\n')
350 /* If lines glued together, put backslash back. */
351 if (filecmdstr[idx] == '\n')
354 bb_error_msg_and_die("empty filename");
355 *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
357 (*retval)[idx] = '\\';
362 static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
364 int cflags = G.regex_type;
369 * A substitution command should look something like this:
370 * s/match/replace/ #gIpw
374 idx = parse_regex_delim(substr, &match, &sed_cmd->string);
376 /* determine the number of back references in the match string */
377 /* Note: we compute this here rather than in the do_subst_command()
378 * function to save processor time, at the expense of a little more memory
379 * (4 bits) per sed_cmd */
381 /* process the flags */
383 sed_cmd->which_match = 1;
384 while (substr[++idx]) {
385 /* Parse match number */
386 if (isdigit(substr[idx])) {
387 if (match[0] != '^') {
388 /* Match 0 treated as all, multiple matches we take the last one. */
389 const char *pos = substr + idx;
390 /* FIXME: error check? */
391 sed_cmd->which_match = (unsigned)strtol(substr+idx, (char**) &pos, 10);
397 if (isspace(substr[idx]))
400 switch (substr[idx]) {
401 /* Replace all occurrences */
404 sed_cmd->which_match = 0;
406 /* Print pattern space */
414 idx += parse_file_cmd(/*sed_cmd,*/ substr+idx, &temp);
417 /* Ignore case (gnu exension) */
423 // while (substr[++idx]) continue;
424 idx += strlen(substr + idx); // same
431 bb_error_msg_and_die("bad option in substitution expression");
435 /* compile the match string into a regex */
436 if (*match != '\0') {
437 /* If match is empty, we use last regex used at runtime */
438 sed_cmd->sub_match = xzalloc(sizeof(regex_t));
439 dbg("xregcomp('%s',%x)", match, cflags);
440 xregcomp(sed_cmd->sub_match, match, cflags);
449 * Process the commands arguments
451 static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
453 static const char cmd_letters[] = "saicrw:btTydDgGhHlnNpPqx={}";
484 struct chk { char chk[sizeof(cmd_letters)-1 == IDX_nul ? 1 : -1]; };
486 unsigned idx = strchrnul(cmd_letters, sed_cmd->cmd) - cmd_letters;
488 /* handle (s)ubstitution command */
490 cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
492 /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
493 else if (idx <= IDX_c) { /* a,i,c */
494 if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
495 bb_error_msg_and_die("only a beginning address can be specified for edit commands");
497 if (*cmdstr == '\n' || *cmdstr == '\\') {
501 if (!isspace(*cmdstr))
505 sed_cmd->string = xstrdup(cmdstr);
506 /* "\anychar" -> "anychar" */
507 parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
508 cmdstr += strlen(cmdstr);
510 /* handle file cmds: (r)ead */
511 else if (idx <= IDX_w) { /* r,w */
512 if (sed_cmd->end_line || sed_cmd->end_match)
513 bb_error_msg_and_die("command only uses one address");
514 cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
515 if (sed_cmd->cmd == 'w') {
516 sed_cmd->sw_file = xfopen_for_write(sed_cmd->string);
517 sed_cmd->sw_last_char = '\n';
520 /* handle branch commands */
521 else if (idx <= IDX_T) { /* :,b,t,T */
524 cmdstr = skip_whitespace(cmdstr);
525 length = strcspn(cmdstr, semicolon_whitespace);
527 sed_cmd->string = xstrndup(cmdstr, length);
531 /* translation command */
532 else if (idx == IDX_y) {
533 char *match, *replace;
536 cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
537 /* \n already parsed, but \delimiter needs unescaping. */
538 parse_escapes(match, match, strlen(match), i, i);
539 parse_escapes(replace, replace, strlen(replace), i, i);
541 sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
542 for (i = 0; match[i] && replace[i]; i++) {
543 sed_cmd->string[i*2] = match[i];
544 sed_cmd->string[i*2+1] = replace[i];
549 /* if it wasnt a single-letter command that takes no arguments
550 * then it must be an invalid command.
552 else if (idx >= IDX_nul) { /* not d,D,g,G,h,H,l,n,N,p,P,q,x,=,{,} */
553 bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
556 /* give back whatever's left over */
561 /* Parse address+command sets, skipping comment lines. */
563 static void add_cmd(const char *cmdstr)
568 /* Append this line to any unfinished line from last time. */
569 if (G.add_cmd_line) {
570 char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
571 free(G.add_cmd_line);
572 cmdstr = G.add_cmd_line = tp;
575 /* If this line ends with unescaped backslash, request next line. */
576 n = len = strlen(cmdstr);
577 while (n && cmdstr[n-1] == '\\')
579 if ((len - n) & 1) { /* if odd number of trailing backslashes */
581 G.add_cmd_line = xstrdup(cmdstr);
582 G.add_cmd_line[len-1] = '\0';
586 /* Loop parsing all commands in this line. */
588 /* Skip leading whitespace and semicolons */
589 cmdstr += strspn(cmdstr, semicolon_whitespace);
591 /* If no more commands, exit. */
594 /* if this is a comment, jump past it and keep going */
595 if (*cmdstr == '#') {
596 /* "#n" is the same as using -n on the command line */
597 if (cmdstr[1] == 'n')
599 cmdstr = strpbrk(cmdstr, "\n\r");
605 * format is: [addr][,addr][!]cmd
610 sed_cmd = xzalloc(sizeof(sed_cmd_t));
612 /* first part (if present) is an address: either a '$', a number or a /regex/ */
613 cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
614 sed_cmd->beg_line_orig = sed_cmd->beg_line;
616 /* second part (if present) will begin with a comma */
617 if (*cmdstr == ',') {
621 idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
623 bb_error_msg_and_die("no address after comma");
627 /* skip whitespace before the command */
628 cmdstr = skip_whitespace(cmdstr);
630 /* Check for inversion flag */
631 if (*cmdstr == '!') {
635 /* skip whitespace before the command */
636 cmdstr = skip_whitespace(cmdstr);
639 /* last part (mandatory) will be a command */
641 bb_error_msg_and_die("missing command");
642 sed_cmd->cmd = *cmdstr++;
643 cmdstr = parse_cmd_args(sed_cmd, cmdstr);
645 /* Add the command to the command array */
646 *G.sed_cmd_tail = sed_cmd;
647 G.sed_cmd_tail = &sed_cmd->next;
650 /* If we glued multiple lines together, free the memory. */
651 free(G.add_cmd_line);
652 G.add_cmd_line = NULL;
655 /* Append to a string, reallocating memory as necessary. */
659 static void pipe_putc(char c)
661 if (G.pipeline.idx == G.pipeline.len) {
662 G.pipeline.buf = xrealloc(G.pipeline.buf,
663 G.pipeline.len + PIPE_GROW);
664 G.pipeline.len += PIPE_GROW;
666 G.pipeline.buf[G.pipeline.idx++] = c;
669 static void do_subst_w_backrefs(char *line, char *replace)
673 /* go through the replacement string */
674 for (i = 0; replace[i]; i++) {
675 /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
676 if (replace[i] == '\\') {
677 unsigned backref = replace[++i] - '0';
679 /* print out the text held in G.regmatch[backref] */
680 if (G.regmatch[backref].rm_so != -1) {
681 j = G.regmatch[backref].rm_so;
682 while (j < G.regmatch[backref].rm_eo)
683 pipe_putc(line[j++]);
687 /* I _think_ it is impossible to get '\' to be
688 * the last char in replace string. Thus we dont check
689 * for replace[i] == NUL. (counterexample anyone?) */
690 /* if we find a backslash escaped character, print the character */
691 pipe_putc(replace[i]);
694 /* if we find an unescaped '&' print out the whole matched text. */
695 if (replace[i] == '&') {
696 j = G.regmatch[0].rm_so;
697 while (j < G.regmatch[0].rm_eo)
698 pipe_putc(line[j++]);
701 /* Otherwise just output the character. */
702 pipe_putc(replace[i]);
706 static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
708 char *line = *line_p;
710 unsigned match_count = 0;
711 regex_t *current_regex;
713 current_regex = sed_cmd->sub_match;
714 /* Handle empty regex. */
715 if (!current_regex) {
716 current_regex = G.previous_regex_ptr;
718 bb_error_msg_and_die("no previous regexp");
720 G.previous_regex_ptr = current_regex;
722 /* Find the first match */
723 dbg("matching '%s'", line);
724 if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0)) {
730 /* Initialize temporary output buffer. */
731 G.pipeline.buf = xmalloc(PIPE_GROW);
732 G.pipeline.len = PIPE_GROW;
735 /* Now loop through, substituting for matches */
739 /* Work around bug in glibc regexec, demonstrated by:
740 * echo " a.b" | busybox sed 's [^ .]* x g'
741 * The match_count check is so not to break
742 * echo "hi" | busybox sed 's/^/!/g'
744 if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
751 /* If we aren't interested in this match, output old line to
752 end of match and continue */
753 if (sed_cmd->which_match
754 && (sed_cmd->which_match != match_count)
756 for (i = 0; i < G.regmatch[0].rm_eo; i++)
761 /* print everything before the match */
762 for (i = 0; i < G.regmatch[0].rm_so; i++)
765 /* then print the substitution string */
766 do_subst_w_backrefs(line, sed_cmd->string);
768 /* advance past the match */
769 line += G.regmatch[0].rm_eo;
770 /* flag that something has changed */
773 /* if we're not doing this globally, get out now */
774 if (sed_cmd->which_match != 0)
780 //maybe (G.regmatch[0].rm_eo ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
781 } while (regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
783 /* Copy rest of string into output pipeline */
792 *line_p = G.pipeline.buf;
796 /* Set command pointer to point to this label. (Does not handle null label.) */
797 static sed_cmd_t *branch_to(char *label)
801 for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
802 if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
806 bb_error_msg_and_die("can't find label for jump to '%s'", label);
809 static void append(char *s)
811 llist_add_to_end(&G.append_head, xstrdup(s));
814 static void flush_append(void)
818 /* Output appended lines. */
819 while ((data = (char *)llist_pop(&G.append_head))) {
820 fprintf(G.nonstdout, "%s\n", data);
825 static void add_input_file(FILE *file)
827 G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count);
828 G.input_file_list[G.input_file_count++] = file;
831 /* Get next line of input from G.input_file_list, flushing append buffer and
832 * noting if we ran out of files without a newline on the last line we read.
838 static char *get_next_line(char *gets_char)
846 /* will be returned if last line in the file
847 * doesn't end with either '\n' or '\0' */
849 while (G.current_input_file < G.input_file_count) {
850 FILE *fp = G.input_file_list[G.current_input_file];
851 /* Read line up to a newline or NUL byte, inclusive,
852 * return malloc'ed char[]. length of the chunk read
853 * is stored in len. NULL if EOF/error */
854 temp = bb_get_chunk_from_file(fp, &len);
856 /* len > 0 here, it's ok to do temp[len-1] */
857 char c = temp[len-1];
858 if (c == '\n' || c == '\0') {
869 /* else we put NO_EOL_CHAR into *gets_char */
872 /* NB: I had the idea of peeking next file(s) and returning
873 * NO_EOL_CHAR only if it is the *last* non-empty
874 * input file. But there is a case where this won't work:
875 * file1: "a woo\nb woo"
876 * file2: "c no\nd no"
877 * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
878 * (note: *no* newline after "b bang"!) */
880 /* Close this file and advance to next one */
882 G.current_input_file++;
888 /* Output line of text. */
890 * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
891 * Without them, we had this:
895 * sed "s/i/z/" z1 z2 znull | hexdump -vC
898 * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn|
900 * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn|
902 static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
904 char lpc = *last_puts_char;
906 /* Need to insert a '\n' between two files because first file's
907 * last line wasn't terminated? */
908 if (lpc != '\n' && lpc != '\0') {
914 /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
918 /* had trailing '\0' and it was last char of file? */
919 if (last_gets_char == LAST_IS_NUL) {
923 /* had trailing '\n' or '\0'? */
924 if (last_gets_char != NO_EOL_CHAR) {
925 fputc(last_gets_char, file);
926 lpc = last_gets_char;
930 xfunc_error_retval = 4; /* It's what gnu sed exits with... */
931 bb_error_msg_and_die(bb_msg_write_error);
933 *last_puts_char = lpc;
936 #define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
938 static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
940 int retval = sed_cmd->beg_match && !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0);
942 G.previous_regex_ptr = sed_cmd->beg_match;
946 /* Process all the lines in all the files */
948 static void process_files(void)
950 char *pattern_space, *next_line;
952 char last_puts_char = '\n';
953 char last_gets_char, next_gets_char;
958 next_line = get_next_line(&next_gets_char);
960 /* Go through every line in each file */
964 /* Advance to next line. Stop if out of lines. */
965 pattern_space = next_line;
968 last_gets_char = next_gets_char;
970 /* Read one line in advance so we can act on the last line,
972 next_line = get_next_line(&next_gets_char);
975 /* For every line, go through all the commands */
977 for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
978 int old_matched, matched;
980 old_matched = sed_cmd->in_match;
982 /* Determine if this command matches this line: */
984 dbg("match1:%d", sed_cmd->in_match);
985 dbg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
986 && !sed_cmd->beg_match && !sed_cmd->end_match));
987 dbg("match3:%d", (sed_cmd->beg_line > 0
988 && (sed_cmd->end_line || sed_cmd->end_match
989 ? (sed_cmd->beg_line <= linenum)
990 : (sed_cmd->beg_line == linenum)
993 dbg("match4:%d", (beg_match(sed_cmd, pattern_space)));
994 dbg("match5:%d", (sed_cmd->beg_line == -1 && next_line == NULL));
996 /* Are we continuing a previous multi-line match? */
997 sed_cmd->in_match = sed_cmd->in_match
998 /* Or is no range necessary? */
999 || (!sed_cmd->beg_line && !sed_cmd->end_line
1000 && !sed_cmd->beg_match && !sed_cmd->end_match)
1001 /* Or did we match the start of a numerical range? */
1002 || (sed_cmd->beg_line > 0
1003 && (sed_cmd->end_line || sed_cmd->end_match
1004 /* note: even if end is numeric and is < linenum too,
1005 * GNU sed matches! We match too, therefore we don't
1006 * check here that linenum <= end.
1008 * printf '1\n2\n3\n4\n' | sed -n '1{N;N;d};1p;2,3p;3p;4p'
1009 * first three input lines are deleted;
1010 * 4th line is matched and printed
1011 * by "2,3" (!) and by "4" ranges
1013 ? (sed_cmd->beg_line <= linenum) /* N,end */
1014 : (sed_cmd->beg_line == linenum) /* N */
1017 /* Or does this line match our begin address regex? */
1018 || (beg_match(sed_cmd, pattern_space))
1019 /* Or did we match last line of input? */
1020 || (sed_cmd->beg_line == -1 && next_line == NULL);
1022 /* Snapshot the value */
1023 matched = sed_cmd->in_match;
1025 dbg("cmd:'%c' matched:%d beg_line:%d end_line:%d linenum:%d",
1026 sed_cmd->cmd, matched, sed_cmd->beg_line, sed_cmd->end_line, linenum);
1028 /* Is this line the end of the current match? */
1031 /* once matched, "n,xxx" range is dead, disabling it */
1032 if (sed_cmd->beg_line > 0) {
1033 sed_cmd->beg_line = -2;
1035 sed_cmd->in_match = !(
1036 /* has the ending line come, or is this a single address command? */
1038 ? sed_cmd->end_line == -1
1040 : (sed_cmd->end_line <= linenum)
1041 : !sed_cmd->end_match
1043 /* or does this line matches our last address regex */
1044 || (sed_cmd->end_match && old_matched
1045 && (regexec(sed_cmd->end_match,
1046 pattern_space, 0, NULL, 0) == 0)
1051 /* Skip blocks of commands we didn't match */
1052 if (sed_cmd->cmd == '{') {
1053 if (sed_cmd->invert ? matched : !matched) {
1054 unsigned nest_cnt = 0;
1056 if (sed_cmd->cmd == '{')
1058 if (sed_cmd->cmd == '}') {
1063 sed_cmd = sed_cmd->next;
1065 bb_error_msg_and_die("unterminated {");
1071 /* Okay, so did this line match? */
1072 if (sed_cmd->invert ? matched : !matched)
1075 /* Update last used regex in case a blank substitute BRE is found */
1076 if (sed_cmd->beg_match) {
1077 G.previous_regex_ptr = sed_cmd->beg_match;
1080 /* actual sedding */
1081 dbg("pattern_space:'%s' next_line:'%s' cmd:%c",
1082 pattern_space, next_line, sed_cmd->cmd);
1083 switch (sed_cmd->cmd) {
1085 /* Print line number */
1087 fprintf(G.nonstdout, "%d\n", linenum);
1090 /* Write the current pattern space up to the first newline */
1093 char *tmp = strchr(pattern_space, '\n');
1096 /* TODO: explain why '\n' below */
1097 sed_puts(pattern_space, '\n');
1104 /* Write the current pattern space to output */
1106 /* NB: we print this _before_ the last line
1107 * (of current file) is printed. Even if
1108 * that line is nonterminated, we print
1109 * '\n' here (gnu sed does the same) */
1110 sed_puts(pattern_space, '\n');
1112 /* Delete up through first newline */
1115 char *tmp = strchr(pattern_space, '\n');
1117 overlapping_strcpy(pattern_space, tmp + 1);
1121 /* discard this line. */
1125 /* Substitute with regex */
1127 if (!do_subst_command(sed_cmd, &pattern_space))
1129 dbg("do_subst_command succeeeded:'%s'", pattern_space);
1132 /* handle p option */
1134 sed_puts(pattern_space, last_gets_char);
1135 /* handle w option */
1136 if (sed_cmd->sw_file)
1138 pattern_space, sed_cmd->sw_file,
1139 &sed_cmd->sw_last_char, last_gets_char);
1142 /* Append line to linked list to be printed later */
1144 append(sed_cmd->string);
1147 /* Insert text before this line */
1149 sed_puts(sed_cmd->string, '\n');
1152 /* Cut and paste text (replace) */
1154 /* Only triggers on last line of a matching range. */
1155 if (!sed_cmd->in_match)
1156 sed_puts(sed_cmd->string, '\n');
1159 /* Read file, append contents to output */
1163 rfile = fopen_for_read(sed_cmd->string);
1167 while ((line = xmalloc_fgetline(rfile))
1170 xprint_and_close_file(rfile);
1176 /* Write pattern space to file. */
1179 pattern_space, sed_cmd->sw_file,
1180 &sed_cmd->sw_last_char, last_gets_char);
1183 /* Read next line from input */
1186 sed_puts(pattern_space, last_gets_char);
1188 free(pattern_space);
1189 pattern_space = next_line;
1190 last_gets_char = next_gets_char;
1191 next_line = get_next_line(&next_gets_char);
1198 /* Quit. End of script, end of input. */
1200 /* Exit the outer while loop */
1203 goto discard_commands;
1205 /* Append the next line to the current line */
1209 /* If no next line, jump to end of script and exit. */
1210 /* http://www.gnu.org/software/sed/manual/sed.html:
1211 * "Most versions of sed exit without printing anything
1212 * when the N command is issued on the last line of
1213 * a file. GNU sed prints pattern space before exiting
1214 * unless of course the -n command switch has been
1215 * specified. This choice is by design."
1217 if (next_line == NULL) {
1218 //goto discard_line;
1219 goto discard_commands; /* GNU behavior */
1221 /* Append next_line, read new next_line. */
1222 len = strlen(pattern_space);
1223 pattern_space = xrealloc(pattern_space, len + strlen(next_line) + 2);
1224 pattern_space[len] = '\n';
1225 strcpy(pattern_space + len+1, next_line);
1226 last_gets_char = next_gets_char;
1227 next_line = get_next_line(&next_gets_char);
1232 /* Test/branch if substitution occurred */
1234 if (!substituted) break;
1237 /* Test/branch if substitution didn't occur */
1239 if (substituted) break;
1241 /* Branch to label */
1243 if (!sed_cmd->string) goto discard_commands;
1244 else sed_cmd = branch_to(sed_cmd->string);
1246 /* Transliterate characters */
1250 for (i = 0; pattern_space[i]; i++) {
1251 for (j = 0; sed_cmd->string[j]; j += 2) {
1252 if (pattern_space[i] == sed_cmd->string[j]) {
1253 pattern_space[i] = sed_cmd->string[j + 1];
1261 case 'g': /* Replace pattern space with hold space */
1262 free(pattern_space);
1263 pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
1265 case 'G': /* Append newline and hold space to pattern space */
1267 int pattern_space_size = 2;
1268 int hold_space_size = 0;
1271 pattern_space_size += strlen(pattern_space);
1273 hold_space_size = strlen(G.hold_space);
1274 pattern_space = xrealloc(pattern_space,
1275 pattern_space_size + hold_space_size);
1276 if (pattern_space_size == 2)
1277 pattern_space[0] = 0;
1278 strcat(pattern_space, "\n");
1280 strcat(pattern_space, G.hold_space);
1281 last_gets_char = '\n';
1285 case 'h': /* Replace hold space with pattern space */
1287 G.hold_space = xstrdup(pattern_space);
1289 case 'H': /* Append newline and pattern space to hold space */
1291 int hold_space_size = 2;
1292 int pattern_space_size = 0;
1295 hold_space_size += strlen(G.hold_space);
1297 pattern_space_size = strlen(pattern_space);
1298 G.hold_space = xrealloc(G.hold_space,
1299 hold_space_size + pattern_space_size);
1301 if (hold_space_size == 2)
1303 strcat(G.hold_space, "\n");
1305 strcat(G.hold_space, pattern_space);
1309 case 'x': /* Exchange hold and pattern space */
1311 char *tmp = pattern_space;
1312 pattern_space = G.hold_space ? G.hold_space : xzalloc(1);
1313 last_gets_char = '\n';
1318 } /* for each cmd */
1321 * Exit point from sedding...
1324 /* we will print the line unless we were told to be quiet ('-n')
1325 or if the line was suppressed (ala 'd'elete) */
1327 sed_puts(pattern_space, last_gets_char);
1329 /* Delete and such jump here. */
1332 free(pattern_space);
1337 /* It is possible to have a command line argument with embedded
1338 * newlines. This counts as multiple command lines.
1339 * However, newline can be escaped: 's/e/z\<newline>z/'
1340 * We check for this.
1343 static void add_cmd_block(char *cmdstr)
1347 cmdstr = sv = xstrdup(cmdstr);
1349 eol = strchr(cmdstr, '\n');
1352 /* Count preceding slashes */
1356 while (sl != cmdstr && *--sl == '\\')
1358 /* Odd number of preceding slashes - newline is escaped */
1360 overlapping_strcpy(eol - 1, eol);
1361 eol = strchr(eol, '\n');
1372 int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1373 int sed_main(int argc UNUSED_PARAM, char **argv)
1376 llist_t *opt_e, *opt_f;
1377 int status = EXIT_SUCCESS;
1381 /* destroy command strings on exit */
1382 if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
1384 /* Lie to autoconf when it starts asking stupid questions. */
1385 if (argv[1] && !strcmp(argv[1], "--version")) {
1386 puts("This is not GNU sed version 4.0");
1390 /* do normal option parsing */
1391 opt_e = opt_f = NULL;
1392 opt_complementary = "e::f::" /* can occur multiple times */
1393 "nn"; /* count -n */
1394 /* -i must be first, to match OPT_in_place definition */
1395 opt = getopt32(argv, "irne:f:", &opt_e, &opt_f,
1396 &G.be_quiet); /* counter for -n */
1399 if (opt & OPT_in_place) { // -i
1400 atexit(cleanup_outname);
1402 if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
1403 //if (opt & 0x4) G.be_quiet++; // -n
1404 while (opt_e) { // -e
1405 add_cmd_block(llist_pop(&opt_e));
1407 while (opt_f) { // -f
1410 cmdfile = xfopen_for_read(llist_pop(&opt_f));
1411 while ((line = xmalloc_fgetline(cmdfile)) != NULL) {
1417 /* if we didn't get a pattern from -e or -f, use argv[0] */
1418 if (!(opt & 0x18)) {
1421 add_cmd_block(*argv++);
1423 /* Flush any unfinished commands. */
1426 /* By default, we write to stdout */
1427 G.nonstdout = stdout;
1429 /* argv[0..(argc-1)] should be names of file to process. If no
1430 * files were specified or '-' was specified, take input from stdin.
1431 * Otherwise, we process all the files specified. */
1432 if (argv[0] == NULL) {
1433 if (opt & OPT_in_place)
1434 bb_error_msg_and_die(bb_msg_requires_arg, "-i");
1435 add_input_file(stdin);
1439 for (i = 0; argv[i]; i++) {
1440 struct stat statbuf;
1445 if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
1446 add_input_file(stdin);
1450 file = fopen_or_warn(argv[i], "r");
1452 status = EXIT_FAILURE;
1455 add_input_file(file);
1456 if (!(opt & OPT_in_place)) {
1460 /* -i: process each FILE separately: */
1462 G.outname = xasprintf("%sXXXXXX", argv[i]);
1463 nonstdoutfd = xmkstemp(G.outname);
1464 G.nonstdout = xfdopen_for_write(nonstdoutfd);
1466 /* Set permissions/owner of output file */
1467 fstat(fileno(file), &statbuf);
1468 /* chmod'ing AFTER chown would preserve suid/sgid bits,
1469 * but GNU sed 4.2.1 does not preserve them either */
1470 fchmod(nonstdoutfd, statbuf.st_mode);
1471 fchown(nonstdoutfd, statbuf.st_uid, statbuf.st_gid);
1474 fclose(G.nonstdout);
1475 G.nonstdout = stdout;
1477 /* unlink(argv[i]); */
1478 xrename(G.outname, argv[i]);
1482 /* Re-enable disabled range matches */
1483 for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
1484 sed_cmd->beg_line = sed_cmd->beg_line_orig;
1487 /* Here, to handle "sed 'cmds' nonexistent_file" case we did:
1488 * if (G.current_input_file >= G.input_file_count)
1490 * but it's not needed since process_files() works correctly
1491 * in this case too. */