2 * Copyright (c) 1992 Diomidis Spinellis.
3 * Copyright (c) 1992, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * Diomidis Spinellis of Imperial College, University of London.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 static const char sccsid[] = "@(#)process.c 8.6 (Berkeley) 4/20/94";
41 #include <sys/types.h>
43 #include <sys/ioctl.h>
62 static SPACE HS, PS, SS, YS;
69 static __inline int applies(struct s_command *);
70 static void do_tr(struct s_tr *);
71 static void flush_appends(void);
72 static void lputs(char *, size_t);
73 static __inline int regexec_e(regex_t *, const char *, int, int, size_t);
74 static void regsub(SPACE *, char *, char *);
75 static int substitute(struct s_command *);
77 struct s_appends *appends; /* Array of pointers to strings to append. */
78 static int appendx; /* Index into appends array. */
79 int appendnum; /* Size of appends array. */
81 static int lastaddr; /* Set by applies if last address of a range. */
82 static int sdone; /* If any substitutes since last line input. */
83 /* Iov structure for 'w' commands. */
84 static regex_t *defpreg;
88 #define OUT() do {fwrite(ps, 1, psl, outfile); fputc('\n', outfile);} while (0)
100 for (linenum = 0; mf_fgets(&PS, REPLACE);) {
115 if (appendx >= appendnum)
116 if ((appends = realloc(appends,
117 sizeof(struct s_appends) *
118 (appendnum *= 2))) == NULL)
120 appends[appendx].type = AP_STRING;
121 appends[appendx].s = cp->t;
122 appends[appendx].len = strlen(cp->t);
131 if (cp->a2 == NULL || lastaddr || lastline())
132 (void)fprintf(outfile, "%s", cp->t);
141 (p = memchr(ps, '\n', psl)) == NULL) {
146 memmove(ps, p + 1, psl);
150 cspace(&PS, hs, hsl, REPLACE);
153 cspace(&PS, "\n", 1, APPEND);
154 cspace(&PS, hs, hsl, APPEND);
157 cspace(&HS, ps, psl, REPLACE);
160 cspace(&HS, "\n", 1, APPEND);
161 cspace(&HS, ps, psl, APPEND);
164 (void)fprintf(outfile, "%s", cp->t);
173 if (!mf_fgets(&PS, REPLACE))
179 cspace(&PS, "\n", 1, APPEND);
180 if (!mf_fgets(&PS, APPEND))
191 if ((p = memchr(ps, '\n', psl)) != NULL) {
205 if (appendx >= appendnum)
206 if ((appends = realloc(appends,
207 sizeof(struct s_appends) *
208 (appendnum *= 2))) == NULL)
210 appends[appendx].type = AP_FILE;
211 appends[appendx].s = cp->t;
212 appends[appendx].len = strlen(cp->t);
216 sdone |= substitute(cp);
228 if (cp->u.fd == -1 && (cp->u.fd = open(cp->t,
229 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
232 if (write(cp->u.fd, ps, psl) != (ssize_t)psl ||
233 write(cp->u.fd, "\n", 1) != 1)
238 * If the hold space is null, make it empty
239 * but not null. Otherwise the pattern space
240 * will become null after the swap, which is
241 * an abnormal condition.
244 cspace(&HS, "", 0, REPLACE);
258 (void)fprintf(outfile, "%lu\n", linenum);
263 new: if (!nflag && !pd)
266 } /* for all lines */
270 * TRUE if the address passed matches the current program state
271 * (lastline, linenumber, ps).
274 ((a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, psl) : \
275 (a)->type == AT_LINE ? linenum == (a)->u.l : lastline())
278 * Return TRUE if the command applies to the current line. Sets the start
279 * line for process ranges. Interprets the non-select (``!'') flag.
282 applies(struct s_command *cp)
287 if (cp->a1 == NULL && cp->a2 == NULL)
290 if (cp->startline > 0) {
295 } else if (linenum - cp->startline <= cp->a2->u.l)
297 else if ((cp->a2->type == AT_LINE &&
298 linenum > cp->a2->u.l) ||
299 (cp->a2->type == AT_RELLINE &&
300 linenum - cp->startline > cp->a2->u.l)) {
302 * We missed the 2nd address due to a branch,
303 * so just close the range and return false.
309 } else if (MATCH(cp->a1)) {
311 * If the second address is a number less than or
312 * equal to the line number first selected, only
313 * one line shall be selected.
315 * Likewise if the relative second line address is zero.
317 if ((cp->a2->type == AT_LINE &&
318 linenum >= cp->a2->u.l) ||
319 (cp->a2->type == AT_RELLINE && cp->a2->u.l == 0))
322 cp->startline = linenum;
329 return (cp->nonsel ? ! r : r);
333 * Reset the sed processor to its initial state.
338 struct s_command *cp;
341 * Reset all in-range markers.
343 for (cp = prog; cp; cp = cp->code == '{' ? cp->u.c : cp->next)
348 * Clear out the hold space.
350 cspace(&HS, "", 0, REPLACE);
355 * Do substitutions in the pattern space. Currently, we build a
356 * copy of the new pattern space in the substitute space structure
357 * and then swap them.
360 substitute(struct s_command *cp)
364 regoff_t re_off, slen;
371 if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) {
372 linenum = cp->u.s->linenum;
373 errx(1, "%lu: %s: \\%u not defined in the RE",
374 linenum, fname, cp->u.s->maxbref);
377 if (!regexec_e(re, s, 0, 0, psl))
380 SS.len = 0; /* Clean substitute space. */
388 if (lastempty || match[0].rm_so != match[0].rm_eo) {
389 /* Locate start of replaced string. */
390 re_off = match[0].rm_so;
391 /* Copy leading retained string. */
392 cspace(&SS, s, re_off, APPEND);
393 /* Add in regular expression. */
394 regsub(&SS, s, cp->u.s->new);
397 /* Move past this match. */
398 if (match[0].rm_so != match[0].rm_eo) {
400 slen -= match[0].rm_eo;
403 if (match[0].rm_so < slen)
404 cspace(&SS, s + match[0].rm_so, 1,
406 s += match[0].rm_so + 1;
407 slen -= match[0].rm_so + 1;
410 } while (slen >= 0 && regexec_e(re, s, REG_NOTBOL, 0, slen));
411 /* Copy trailing retained string. */
413 cspace(&SS, s, slen, APPEND);
415 default: /* Nth occurrence */
417 if (match[0].rm_eo == match[0].rm_so)
418 match[0].rm_eo = match[0].rm_so + 1;
420 slen -= match[0].rm_eo;
423 if (!regexec_e(re, s, REG_NOTBOL, 0, slen))
427 case 1: /* 1st occurrence */
428 /* Locate start of replaced string. */
429 re_off = match[0].rm_so + (s - ps);
430 /* Copy leading retained string. */
431 cspace(&SS, ps, re_off, APPEND);
432 /* Add in regular expression. */
433 regsub(&SS, s, cp->u.s->new);
434 /* Copy trailing retained string. */
436 slen -= match[0].rm_eo;
437 cspace(&SS, s, slen, APPEND);
442 * Swap the substitute space and the pattern space, and make sure
443 * that any leftover pointers into stdio memory get lost.
450 /* Handle the 'p' flag. */
454 /* Handle the 'w' flag. */
455 if (cp->u.s->wfile && !pd) {
456 if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile,
457 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1)
458 err(1, "%s", cp->u.s->wfile);
459 if (write(cp->u.s->wfd, ps, psl) != (ssize_t)psl ||
460 write(cp->u.s->wfd, "\n", 1) != 1)
461 err(1, "%s", cp->u.s->wfile);
468 * Perform translation ('y' command) in the pattern space.
471 do_tr(struct s_tr *y)
478 if (MB_CUR_MAX == 1) {
480 * Single-byte encoding: perform in-place translation
481 * of the pattern space.
483 for (p = ps; p < &ps[psl]; p++)
484 *p = y->bytetab[(u_char)*p];
487 * Multi-byte encoding: perform translation into the
488 * translation space, then swap the translation and
491 /* Clean translation space. */
493 for (p = ps, left = psl; left > 0; p += clen, left -= clen) {
494 if ((c = y->bytetab[(u_char)*p]) != '\0') {
495 cspace(&YS, &c, 1, APPEND);
499 for (i = 0; i < y->nmultis; i++)
500 if (left >= y->multis[i].fromlen &&
501 memcmp(p, y->multis[i].from,
502 y->multis[i].fromlen) == 0)
504 if (i < y->nmultis) {
505 cspace(&YS, y->multis[i].to,
506 y->multis[i].tolen, APPEND);
507 clen = y->multis[i].fromlen;
509 cspace(&YS, p, 1, APPEND);
513 /* Swap the translation space and the pattern space. */
522 * Flush append requests. Always called before reading a line,
523 * therefore it also resets the substitution done (sdone) flag.
532 for (i = 0; i < appendx; i++)
533 switch (appends[i].type) {
535 fwrite(appends[i].s, sizeof(char), appends[i].len,
540 * Read files probably shouldn't be cached. Since
541 * it's not an error to read a non-existent file,
542 * it's possible that another program is interacting
543 * with the sed script through the filesystem. It
544 * would be truly bizarre, but possible. It's probably
545 * not that big a performance win, anyhow.
547 if ((f = fopen(appends[i].s, "r")) == NULL)
549 while ((count = fread(buf, sizeof(char), sizeof(buf), f)))
550 (void)fwrite(buf, sizeof(char), count, outfile);
555 errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO));
560 lputs(char *s, size_t len)
562 static const char escapes[] = "\\\a\b\f\r\t\v";
566 static int termwidth = -1;
571 if (outfile != stdout)
573 if (termwidth == -1) {
574 if ((p = getenv("COLUMNS")) && *p != '\0')
576 else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
578 termwidth = win.ws_col;
585 memset(&mbs, 0, sizeof(mbs));
588 clen = mbrtowc(&wc, s, len, &mbs);
591 if (clen == (size_t)-1 || clen == (size_t)-2) {
592 wc = (unsigned char)*s;
594 memset(&mbs, 0, sizeof(mbs));
597 if (col + 1 >= termwidth)
598 fprintf(outfile, "\\\n");
600 fputc('\n', outfile);
602 } else if (iswprint(wc)) {
604 if (col + width >= termwidth) {
605 fprintf(outfile, "\\\n");
608 fwrite(s, 1, clen, outfile);
610 } else if (wc != L'\0' && (c = wctob(wc)) != EOF &&
611 (p = strchr(escapes, c)) != NULL) {
612 if (col + 2 >= termwidth) {
613 fprintf(outfile, "\\\n");
616 fprintf(outfile, "\\%c", "\\abfrtv"[p - escapes]);
619 if (col + 4 * clen >= (unsigned)termwidth) {
620 fprintf(outfile, "\\\n");
623 for (i = 0; i < clen; i++)
624 fprintf(outfile, "\\%03o",
625 (int)(unsigned char)s[i]);
631 if (col + 1 >= termwidth)
632 fprintf(outfile, "\\\n");
633 (void)fputc('$', outfile);
634 (void)fputc('\n', outfile);
636 errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO));
640 regexec_e(regex_t *preg, const char *string, int eflags, int nomatch,
647 errx(1, "first RE may not be empty");
653 match[0].rm_eo = slen;
655 eval = regexec(defpreg, string,
656 nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND);
663 errx(1, "RE error: %s", strregerror(eval, defpreg));
668 * regsub - perform substitutions after a regexp match
669 * Based on a routine by Henry Spencer
672 regsub(SPACE *sp, char *string, char *src)
677 #define NEEDSP(reqlen) \
678 /* XXX What is the +1 for? */ \
679 if (sp->len + (reqlen) + 1 >= sp->blen) { \
680 sp->blen += (reqlen) + 1024; \
681 if ((sp->space = sp->back = realloc(sp->back, sp->blen)) \
684 dst = sp->space + sp->len; \
687 dst = sp->space + sp->len;
688 while ((c = *src++) != '\0') {
691 else if (c == '\\' && isdigit((unsigned char)*src))
695 if (no < 0) { /* Ordinary character. */
696 if (c == '\\' && (*src == '\\' || *src == '&'))
701 } else if (match[no].rm_so != -1 && match[no].rm_eo != -1) {
702 len = match[no].rm_eo - match[no].rm_so;
704 memmove(dst, string + match[no].rm_so, len);
715 * Concatenate space: append the source space to the destination space,
716 * allocating new space as necessary.
719 cspace(SPACE *sp, const char *p, size_t len, enum e_spflag spflag)
723 /* Make sure SPACE has enough memory and ramp up quickly. */
724 tlen = sp->len + len + 1;
725 if (tlen > sp->blen) {
726 sp->blen = tlen + 1024;
727 if ((sp->space = sp->back = realloc(sp->back, sp->blen)) ==
732 if (spflag == REPLACE)
735 memmove(sp->space + sp->len, p, len);
737 sp->space[sp->len += len] = '\0';
741 * Close all cached opened files and report any errors
744 cfclose(struct s_command *cp, struct s_command *end)
747 for (; cp != end; cp = cp->next)
750 if (cp->u.s->wfd != -1 && close(cp->u.s->wfd))
751 err(1, "%s", cp->u.s->wfile);
755 if (cp->u.fd != -1 && close(cp->u.fd))
760 cfclose(cp->u.c, cp->next);