2 * Copyright (c) 1992 Diomidis Spinellis.
3 * Copyright (c) 1992, 1993
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
33 * @(#)compile.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.bin/sed/compile.c,v 1.34 2009/05/25 06:45:33 brian Exp $
37 #include <sys/types.h>
55 #define LHMASK (LHSZ - 1)
56 static struct labhash {
57 struct labhash *lh_next;
59 struct s_command *lh_cmd;
63 static char *compile_addr(char *, struct s_addr *);
64 static char *compile_ccl(char **, char *);
65 static char *compile_delimited(char *, char *);
66 static char *compile_flags(char *, struct s_subst *);
67 static regex_t *compile_re(char *, int);
68 static char *compile_subst(char *, struct s_subst *);
69 static char *compile_text(void);
70 static char *compile_tr(char *, struct s_tr **);
71 static struct s_command
72 **compile_stream(struct s_command **);
73 static char *duptoeol(char *, const char *);
74 static void enterlabel(struct s_command *);
75 static struct s_command
77 static void fixuplabel(struct s_command *, struct s_command *);
78 static void uselabel(void);
81 * Command specification. This is used to drive the command parser.
84 char code; /* Command code */
85 int naddr; /* Number of address args */
86 enum e_args args; /* Argument type */
89 static struct s_format cmd_fmts[] = {
121 /* The compiled program. */
122 struct s_command *prog;
125 * Compile the program into prog.
126 * Initialise appends.
131 *compile_stream(&prog) = NULL;
132 fixuplabel(prog, NULL);
136 else if ((appends = malloc(sizeof(struct s_appends) * appendnum)) ==
139 if ((match = malloc((maxnsub + 1) * sizeof(regmatch_t))) == NULL)
143 #define EATSPACE() do { \
145 while (*p && isspace((unsigned char)*p)) \
149 static struct s_command **
150 compile_stream(struct s_command **link)
153 static char lbuf[_POSIX2_LINE_MAX + 1]; /* To save stack */
154 struct s_command *cmd, *cmd2, *stack;
156 char re[_POSIX2_LINE_MAX + 1];
157 int naddr; /* Number of addresses */
161 if ((p = cu_fgets(lbuf, sizeof(lbuf), NULL)) == NULL) {
163 errx(1, "%lu: %s: unexpected EOF (pending }'s)",
168 semicolon: EATSPACE();
170 if (*p == '#' || *p == '\0')
172 else if (*p == ';') {
177 if ((*link = cmd = malloc(sizeof(struct s_command))) == NULL)
180 cmd->startline = cmd->nonsel = 0;
181 /* First parse the addresses */
184 /* Valid characters to start an address */
185 #define addrchar(c) (strchr("0123456789/\\$", (c)))
188 if ((cmd->a1 = malloc(sizeof(struct s_addr))) == NULL)
190 p = compile_addr(p, cmd->a1);
191 EATSPACE(); /* EXTENSION */
194 EATSPACE(); /* EXTENSION */
196 if ((cmd->a2 = malloc(sizeof(struct s_addr)))
199 p = compile_addr(p, cmd->a2);
204 cmd->a1 = cmd->a2 = 0;
206 nonsel: /* Now parse the command */
208 errx(1, "%lu: %s: command expected", linenum, fname);
210 for (fp = cmd_fmts; fp->code; fp++)
214 errx(1, "%lu: %s: invalid command code %c", linenum, fname, *p);
215 if (naddr > fp->naddr)
217 "%lu: %s: command %c expects up to %d address(es), found %d",
218 linenum, fname, *p, fp->naddr, naddr);
236 * Short-circuit command processing, since end of
237 * group is really just a noop.
241 errx(1, "%lu: %s: unexpected }", linenum, fname);
246 case EMPTY: /* d D g G h H l n N p P q x = \0 */
255 errx(1, "%lu: %s: extra characters at the end of %c command",
256 linenum, fname, cmd->code);
258 case TEXT: /* a c i */
263 "%lu: %s: command %c expects \\ followed by text", linenum, fname, cmd->code);
268 "%lu: %s: extra characters after \\ at the end of %c command",
269 linenum, fname, cmd->code);
270 cmd->t = compile_text();
272 case COMMENT: /* \0 # */
278 errx(1, "%lu: %s: filename expected", linenum, fname);
279 cmd->t = duptoeol(p, "w command");
282 else if ((cmd->u.fd = open(p,
283 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
291 errx(1, "%lu: %s: filename expected", linenum, fname);
293 cmd->t = duptoeol(p, "read command");
295 case BRANCH: /* b t */
301 cmd->t = duptoeol(p, "branch");
306 cmd->t = duptoeol(p, "label");
308 errx(1, "%lu: %s: empty label", linenum, fname);
313 if (*p == '\0' || *p == '\\')
315 "%lu: %s: substitute pattern can not be delimited by newline or backslash",
317 if ((cmd->u.s = calloc(1, sizeof(struct s_subst))) == NULL)
319 p = compile_delimited(p, re);
322 "%lu: %s: unterminated substitute pattern", linenum, fname);
324 /* Compile RE with no case sensitivity temporarily */
328 cmd->u.s->re = compile_re(re, 0);
330 p = compile_subst(p, cmd->u.s);
331 p = compile_flags(p, cmd->u.s);
333 /* Recompile RE with case sensitivity from "I" flag if any */
337 cmd->u.s->re = compile_re(re, cmd->u.s->icase);
347 p = compile_tr(p, &cmd->u.y);
356 "%lu: %s: extra text at the end of a transform command", linenum, fname);
363 * Get a delimited string. P points to the delimeter of the string; d points
364 * to a buffer area. Newline and delimiter escapes are processed; other
365 * escapes are ignored.
367 * Returns a pointer to the first character after the final delimiter or NULL
368 * in the case of a non-terminated string. The character array d is filled
369 * with the processed string.
372 compile_delimited(char *p, char *d)
380 errx(1, "%lu: %s: \\ can not be used as a string delimiter",
383 errx(1, "%lu: %s: newline can not be used as a string delimiter",
387 if ((d = compile_ccl(&p, d)) == NULL)
388 errx(1, "%lu: %s: unbalanced brackets ([])", linenum, fname);
390 } else if (*p == '\\' && p[1] == '[') {
392 } else if (*p == '\\' && p[1] == c)
394 else if (*p == '\\' && p[1] == 'n') {
398 } else if (*p == '\\' && p[1] == '\\')
410 /* compile_ccl: expand a POSIX character class */
412 compile_ccl(char **sp, char *t)
422 for (; *s && (*t = *s) != ']'; s++, t++)
423 if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '=')) {
424 *++t = *++s, t++, s++;
425 for (c = *s; (*t = *s) != ']' || c != d; s++, t++)
426 if ((c = *s) == '\0')
428 } else if (*s == '\\' && s[1] == 'n')
430 return (*s == ']') ? *sp = ++s, ++t : NULL;
434 * Compiles the regular expression in RE and returns a pointer to the compiled
435 * regular expression.
436 * Cflags are passed to regcomp.
439 compile_re(char *re, int case_insensitive)
446 if (case_insensitive)
448 if ((rep = malloc(sizeof(regex_t))) == NULL)
450 if ((eval = regcomp(rep, re, flags)) != 0)
451 errx(1, "%lu: %s: RE error: %s",
452 linenum, fname, strregerror(eval, rep));
453 if (maxnsub < rep->re_nsub)
454 maxnsub = rep->re_nsub;
459 * Compile the substitution string of a regular expression and set res to
460 * point to a saved copy of it. Nsub is the number of parenthesized regular
464 compile_subst(char *p, struct s_subst *s)
466 static char lbuf[_POSIX2_LINE_MAX + 1];
469 char c, *text, *op, *sp;
470 int more = 1, sawesc = 0;
472 c = *p++; /* Terminator character */
477 s->linenum = linenum;
478 asize = 2 * _POSIX2_LINE_MAX + 1;
479 if ((text = malloc(asize)) == NULL)
483 op = sp = text + size;
485 if (*p == '\\' || sawesc) {
487 * If this is a continuation from the last
488 * buffer, we won't have a character to
498 * This escaped character is continued
499 * in the next part of the line. Note
500 * this fact, then cause the loop to
501 * exit w/ normal EOL case and reenter
502 * above with the new buffer.
507 } else if (strchr("123456789", *p) != NULL) {
511 ref > s->re->re_nsub)
512 errx(1, "%lu: %s: \\%c not defined in the RE",
514 if (s->maxbref < ref)
516 } else if (*p == '&' || *p == '\\')
518 } else if (*p == c) {
519 if (*++p == '\0' && more) {
520 if (cu_fgets(lbuf, sizeof(lbuf), &more))
525 if ((s->new = realloc(text, size)) == NULL)
528 } else if (*p == '\n') {
530 "%lu: %s: unescaped newline inside substitute pattern", linenum, fname);
536 if (asize - size < _POSIX2_LINE_MAX + 1) {
538 if ((text = realloc(text, asize)) == NULL)
541 } while (cu_fgets(p = lbuf, sizeof(lbuf), &more));
542 errx(1, "%lu: %s: unterminated substitute in regular expression",
548 * Compile the flags of the s command
551 compile_flags(char *p, struct s_subst *s)
553 int gn; /* True if we have seen g or n */
555 char wfile[_POSIX2_LINE_MAX + 1], *q;
557 s->n = 1; /* Default */
563 EATSPACE(); /* EXTENSION */
568 "%lu: %s: more than one number or 'g' in substitute flags", linenum, fname);
582 case '1': case '2': case '3':
583 case '4': case '5': case '6':
584 case '7': case '8': case '9':
587 "%lu: %s: more than one number or 'g' in substitute flags", linenum, fname);
590 nval = strtol(p, &p, 10);
591 if (errno == ERANGE || nval > INT_MAX)
593 "%lu: %s: overflow in the 'N' substitute flag", linenum, fname);
599 #ifdef HISTORIC_PRACTICE
601 warnx("%lu: %s: space missing before w wfile", linenum, fname);
614 errx(1, "%lu: %s: no wfile specified", linenum, fname);
615 s->wfile = strdup(wfile);
616 if (!aflag && (s->wfd = open(wfile,
617 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
622 errx(1, "%lu: %s: bad flag in substitute command: '%c'",
631 * Compile a translation set of strings into a lookup table.
634 compile_tr(char *p, struct s_tr **py)
639 char old[_POSIX2_LINE_MAX + 1];
640 char new[_POSIX2_LINE_MAX + 1];
641 size_t oclen, oldlen, nclen, newlen;
642 mbstate_t mbs1, mbs2;
644 if ((*py = y = malloc(sizeof(*y))) == NULL)
649 if (*p == '\0' || *p == '\\')
651 "%lu: %s: transform pattern can not be delimited by newline or backslash",
653 p = compile_delimited(p, old);
655 errx(1, "%lu: %s: unterminated transform source string",
657 p = compile_delimited(p - 1, new);
659 errx(1, "%lu: %s: unterminated transform target string",
663 oldlen = mbsrtowcs(NULL, &op, 0, NULL);
664 if (oldlen == (size_t)-1)
667 newlen = mbsrtowcs(NULL, &np, 0, NULL);
668 if (newlen == (size_t)-1)
670 if (newlen != oldlen)
671 errx(1, "%lu: %s: transform strings are not the same length",
673 if (MB_CUR_MAX == 1) {
675 * The single-byte encoding case is easy: generate a
678 for (i = 0; i <= UCHAR_MAX; i++)
679 y->bytetab[i] = (char)i;
680 for (; *op; op++, np++)
681 y->bytetab[(u_char)*op] = *np;
684 * Multi-byte encoding case: generate a lookup table as
685 * above, but only for single-byte characters. The first
686 * bytes of multi-byte characters have their lookup table
687 * entries set to 0, which causes do_tr() to search through
688 * an auxiliary vector of multi-byte mappings.
690 memset(&mbs1, 0, sizeof(mbs1));
691 memset(&mbs2, 0, sizeof(mbs2));
692 for (i = 0; i <= UCHAR_MAX; i++)
693 y->bytetab[i] = (btowc(i) != WEOF) ? i : 0;
694 while (*op != '\0') {
695 oclen = mbrlen(op, MB_LEN_MAX, &mbs1);
696 if (oclen == (size_t)-1 || oclen == (size_t)-2)
697 errc(1, EILSEQ, NULL);
698 nclen = mbrlen(np, MB_LEN_MAX, &mbs2);
699 if (nclen == (size_t)-1 || nclen == (size_t)-2)
700 errc(1, EILSEQ, NULL);
701 if (oclen == 1 && nclen == 1)
702 y->bytetab[(u_char)*op] = *np;
704 y->bytetab[(u_char)*op] = 0;
705 y->multis = realloc(y->multis,
706 (y->nmultis + 1) * sizeof(*y->multis));
707 if (y->multis == NULL)
710 y->multis[i].fromlen = oclen;
711 memcpy(y->multis[i].from, op, oclen);
712 y->multis[i].tolen = nclen;
713 memcpy(y->multis[i].to, np, nclen);
723 * Compile the text following an a or i command.
728 int asize, esc_nl, size;
729 char *text, *p, *op, *s;
730 char lbuf[_POSIX2_LINE_MAX + 1];
732 asize = 2 * _POSIX2_LINE_MAX + 1;
733 if ((text = malloc(asize)) == NULL)
736 while (cu_fgets(lbuf, sizeof(lbuf), NULL)) {
737 op = s = text + size;
740 for (esc_nl = 0; *p != '\0'; p++) {
741 if (*p == '\\' && p[1] != '\0' && *++p == '\n')
750 if (asize - size < _POSIX2_LINE_MAX + 1) {
752 if ((text = realloc(text, asize)) == NULL)
757 if ((p = realloc(text, size + 1)) == NULL)
763 * Get an address and return a pointer to the first character after
764 * it. Fill the structure pointed to according to the address.
767 compile_addr(char *p, struct s_addr *a)
769 char *end, re[_POSIX2_LINE_MAX + 1];
776 case '\\': /* Context address */
779 case '/': /* Context address */
780 p = compile_delimited(p, re);
782 errx(1, "%lu: %s: unterminated regular expression", linenum, fname);
783 /* Check for case insensitive regexp flag */
791 a->u.r = compile_re(re, icase);
795 case '$': /* Last line */
799 case '+': /* Relative line number */
800 a->type = AT_RELLINE;
804 case '0': case '1': case '2': case '3': case '4':
805 case '5': case '6': case '7': case '8': case '9':
808 a->u.l = strtol(p, &end, 10);
811 errx(1, "%lu: %s: expected context address", linenum, fname);
818 * Return a copy of all the characters up to \n or \0.
821 duptoeol(char *s, const char *ctype)
828 for (start = s; *s != '\0' && *s != '\n'; ++s)
829 ws = isspace((unsigned char)*s);
832 warnx("%lu: %s: whitespace after %s", linenum, fname, ctype);
834 if ((p = malloc(len)) == NULL)
836 return (memmove(p, start, len));
840 * Convert goto label names to addresses, and count a and r commands, in
841 * the given subset of the script. Free the memory used by labels in b
842 * and t commands (but not by :).
844 * TODO: Remove } nodes
847 fixuplabel(struct s_command *cp, struct s_command *end)
850 for (; cp != end; cp = cp->next)
858 /* Resolve branch target. */
863 if ((cp->u.c = findlabel(cp->t)) == NULL)
864 errx(1, "%lu: %s: undefined label '%s'", linenum, fname, cp->t);
868 /* Do interior commands. */
869 fixuplabel(cp->u.c, cp->next);
875 * Associate the given command label for later lookup.
878 enterlabel(struct s_command *cp)
880 struct labhash **lhp, *lh;
884 for (h = 0, p = (u_char *)cp->t; (c = *p) != 0; p++)
885 h = (h << 5) + h + c;
886 lhp = &labels[h & LHMASK];
887 for (lh = *lhp; lh != NULL; lh = lh->lh_next)
888 if (lh->lh_hash == h && strcmp(cp->t, lh->lh_cmd->t) == 0)
889 errx(1, "%lu: %s: duplicate label '%s'", linenum, fname, cp->t);
890 if ((lh = malloc(sizeof *lh)) == NULL)
900 * Find the label contained in the command l in the command linked
901 * list cp. L is excluded from the search. Return NULL if not found.
903 static struct s_command *
904 findlabel(char *name)
910 for (h = 0, p = (u_char *)name; (c = *p) != 0; p++)
911 h = (h << 5) + h + c;
912 for (lh = labels[h & LHMASK]; lh != NULL; lh = lh->lh_next) {
913 if (lh->lh_hash == h && strcmp(name, lh->lh_cmd->t) == 0) {
922 * Warn about any unused labels. As a side effect, release the label hash
928 struct labhash *lh, *next;
931 for (i = 0; i < LHSZ; i++) {
932 for (lh = labels[i]; lh != NULL; lh = next) {
935 warnx("%lu: %s: unused label '%s'",
936 linenum, fname, lh->lh_cmd->t);