630 lines
15 KiB
C
630 lines
15 KiB
C
/*-
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* Copyright (c) 1992 Diomidis Spinellis.
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Diomidis Spinellis of Imperial College, University of London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)process.c 8.6 (Berkeley) 4/20/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/uio.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <regex.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "defs.h"
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#include "extern.h"
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static SPACE HS, PS, SS;
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#define pd PS.deleted
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#define ps PS.space
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#define psl PS.len
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#define hs HS.space
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#define hsl HS.len
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static inline int applies __P((struct s_command *));
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static void flush_appends __P((void));
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static void lputs __P((char *));
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static inline int regexec_e __P((regex_t *, const char *, int, int, size_t));
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static void regsub __P((SPACE *, char *, char *));
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static int substitute __P((struct s_command *));
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struct s_appends *appends; /* Array of pointers to strings to append. */
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static int appendx; /* Index into appends array. */
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int appendnum; /* Size of appends array. */
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static int lastaddr; /* Set by applies if last address of a range. */
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static int sdone; /* If any substitutes since last line input. */
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/* Iov structure for 'w' commands. */
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static regex_t *defpreg;
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size_t maxnsub;
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regmatch_t *match;
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#define OUT(s) { fwrite(s, sizeof(u_char), psl, stdout); }
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void
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process()
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{
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struct s_command *cp;
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SPACE tspace;
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size_t len;
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char oldc, *p;
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for (linenum = 0; mf_fgets(&PS, REPLACE);) {
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pd = 0;
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cp = prog;
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redirect:
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while (cp != NULL) {
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if (!applies(cp)) {
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cp = cp->next;
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continue;
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}
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switch (cp->code) {
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case '{':
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cp = cp->u.c;
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goto redirect;
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case 'a':
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if (appendx >= appendnum)
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appends = xrealloc(appends,
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sizeof(struct s_appends) *
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(appendnum *= 2));
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appends[appendx].type = AP_STRING;
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appends[appendx].s = cp->t;
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appends[appendx].len = strlen(cp->t);
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appendx++;
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break;
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case 'b':
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cp = cp->u.c;
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goto redirect;
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case 'c':
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pd = 1;
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psl = 0;
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if (cp->a2 == NULL || lastaddr)
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(void)printf("%s", cp->t);
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break;
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case 'd':
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pd = 1;
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goto new;
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case 'D':
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if (pd)
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goto new;
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if ((p = memchr(ps, '\n', psl)) == NULL)
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pd = 1;
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else {
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psl -= (p - ps) + 1;
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memmove(ps, p + 1, psl);
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}
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goto new;
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case 'g':
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cspace(&PS, hs, hsl, REPLACE);
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break;
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case 'G':
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cspace(&PS, hs, hsl, 0);
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break;
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case 'h':
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cspace(&HS, ps, psl, REPLACE);
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break;
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case 'H':
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cspace(&HS, ps, psl, 0);
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break;
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case 'i':
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(void)printf("%s", cp->t);
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break;
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case 'l':
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lputs(ps);
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break;
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case 'n':
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if (!nflag && !pd)
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OUT(ps)
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flush_appends();
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if (!mf_fgets(&PS, REPLACE))
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exit(0);
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pd = 0;
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break;
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case 'N':
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flush_appends();
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if (!mf_fgets(&PS, 0)) {
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if (!nflag && !pd)
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OUT(ps)
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exit(0);
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}
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break;
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case 'p':
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if (pd)
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break;
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OUT(ps)
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break;
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case 'P':
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if (pd)
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break;
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if ((p = memchr(ps, '\n', psl)) != NULL) {
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oldc = *p;
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*p = '\0';
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}
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OUT(ps)
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if (p != NULL)
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*p = oldc;
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break;
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case 'q':
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if (!nflag && !pd)
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OUT(ps)
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flush_appends();
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exit(0);
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case 'r':
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if (appendx >= appendnum)
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appends = xrealloc(appends,
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sizeof(struct s_appends) *
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(appendnum *= 2));
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appends[appendx].type = AP_FILE;
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appends[appendx].s = cp->t;
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appends[appendx].len = strlen(cp->t);
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appendx++;
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break;
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case 's':
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sdone |= substitute(cp);
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break;
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case 't':
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if (sdone) {
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sdone = 0;
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cp = cp->u.c;
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goto redirect;
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}
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break;
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case 'w':
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if (pd)
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break;
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if (cp->u.fd == -1 && (cp->u.fd = open(cp->t,
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O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
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DEFFILEMODE)) == -1)
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err(FATAL, "%s: %s\n",
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cp->t, strerror(errno));
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if (write(cp->u.fd, ps, psl) != psl)
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err(FATAL, "%s: %s\n",
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cp->t, strerror(errno));
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break;
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case 'x':
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if (hs == NULL)
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cspace(&HS, "", 0, REPLACE);
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tspace = PS;
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PS = HS;
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HS = tspace;
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break;
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case 'y':
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if (pd)
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break;
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for (p = ps, len = psl; --len; ++p)
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*p = cp->u.y[*p];
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break;
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case ':':
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case '}':
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break;
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case '=':
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(void)printf("%lu\n", linenum);
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}
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cp = cp->next;
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} /* for all cp */
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new: if (!nflag && !pd)
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OUT(ps)
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flush_appends();
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} /* for all lines */
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}
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/*
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* TRUE if the address passed matches the current program state
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* (lastline, linenumber, ps).
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*/
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#define MATCH(a) \
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(a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, psl) : \
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(a)->type == AT_LINE ? linenum == (a)->u.l : lastline
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/*
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* Return TRUE if the command applies to the current line. Sets the inrange
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* flag to process ranges. Interprets the non-select (``!'') flag.
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*/
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static inline int
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applies(cp)
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struct s_command *cp;
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{
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int r;
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lastaddr = 0;
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if (cp->a1 == NULL && cp->a2 == NULL)
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r = 1;
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else if (cp->a2)
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if (cp->inrange) {
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if (MATCH(cp->a2)) {
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cp->inrange = 0;
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lastaddr = 1;
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}
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r = 1;
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} else if (MATCH(cp->a1)) {
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/*
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* If the second address is a number less than or
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* equal to the line number first selected, only
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* one line shall be selected.
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* -- POSIX 1003.2
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*/
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if (cp->a2->type == AT_LINE &&
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linenum >= cp->a2->u.l)
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lastaddr = 1;
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else
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cp->inrange = 1;
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r = 1;
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} else
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r = 0;
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else
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r = MATCH(cp->a1);
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return (cp->nonsel ? ! r : r);
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}
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/*
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* substitute --
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* Do substitutions in the pattern space. Currently, we build a
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* copy of the new pattern space in the substitute space structure
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* and then swap them.
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*/
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static int
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substitute(cp)
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struct s_command *cp;
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{
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SPACE tspace;
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regex_t *re;
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size_t re_off, slen;
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int lastempty, n;
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char *s;
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s = ps;
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re = cp->u.s->re;
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if (re == NULL) {
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if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) {
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linenum = cp->u.s->linenum;
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err(COMPILE, "\\%d not defined in the RE",
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cp->u.s->maxbref);
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}
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}
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if (!regexec_e(re, s, 0, 0, psl))
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return (0);
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SS.len = 0; /* Clean substitute space. */
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slen = psl;
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n = cp->u.s->n;
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lastempty = 1;
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switch (n) {
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case 0: /* Global */
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do {
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if (lastempty || match[0].rm_so != match[0].rm_eo) {
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/* Locate start of replaced string. */
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re_off = match[0].rm_so;
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/* Copy leading retained string. */
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cspace(&SS, s, re_off, APPEND);
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/* Add in regular expression. */
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regsub(&SS, s, cp->u.s->new);
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}
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/* Move past this match. */
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if (match[0].rm_so != match[0].rm_eo) {
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s += match[0].rm_eo;
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slen -= match[0].rm_eo;
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lastempty = 0;
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} else {
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if (match[0].rm_so == 0)
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cspace(&SS,
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s, match[0].rm_so + 1, APPEND);
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else
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cspace(&SS,
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s + match[0].rm_so, 1, APPEND);
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s += match[0].rm_so + 1;
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slen -= match[0].rm_so + 1;
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lastempty = 1;
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}
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} while (slen > 0 && regexec_e(re, s, REG_NOTBOL, 0, slen));
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/* Copy trailing retained string. */
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if (slen > 0)
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cspace(&SS, s, slen, APPEND);
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break;
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default: /* Nth occurrence */
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while (--n) {
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s += match[0].rm_eo;
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slen -= match[0].rm_eo;
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if (!regexec_e(re, s, REG_NOTBOL, 0, slen))
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return (0);
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}
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/* FALLTHROUGH */
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case 1: /* 1st occurrence */
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/* Locate start of replaced string. */
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re_off = match[0].rm_so + (s - ps);
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/* Copy leading retained string. */
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cspace(&SS, ps, re_off, APPEND);
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/* Add in regular expression. */
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regsub(&SS, s, cp->u.s->new);
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/* Copy trailing retained string. */
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s += match[0].rm_eo;
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slen -= match[0].rm_eo;
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cspace(&SS, s, slen, APPEND);
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break;
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}
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/*
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* Swap the substitute space and the pattern space, and make sure
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* that any leftover pointers into stdio memory get lost.
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*/
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tspace = PS;
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PS = SS;
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SS = tspace;
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SS.space = SS.back;
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/* Handle the 'p' flag. */
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if (cp->u.s->p)
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OUT(ps)
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/* Handle the 'w' flag. */
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if (cp->u.s->wfile && !pd) {
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if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile,
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O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1)
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err(FATAL, "%s: %s\n", cp->u.s->wfile, strerror(errno));
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if (write(cp->u.s->wfd, ps, psl) != psl)
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err(FATAL, "%s: %s\n", cp->u.s->wfile, strerror(errno));
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}
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return (1);
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}
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/*
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* Flush append requests. Always called before reading a line,
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* therefore it also resets the substitution done (sdone) flag.
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*/
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static void
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flush_appends()
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{
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FILE *f;
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int count, i;
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char buf[8 * 1024];
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for (i = 0; i < appendx; i++)
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switch (appends[i].type) {
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case AP_STRING:
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fwrite(appends[i].s, sizeof(char), appends[i].len,
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stdout);
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break;
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case AP_FILE:
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/*
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* Read files probably shouldn't be cached. Since
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* it's not an error to read a non-existent file,
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* it's possible that another program is interacting
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* with the sed script through the file system. It
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* would be truly bizarre, but possible. It's probably
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* not that big a performance win, anyhow.
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*/
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if ((f = fopen(appends[i].s, "r")) == NULL)
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break;
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while (count = fread(buf, sizeof(char), sizeof(buf), f))
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(void)fwrite(buf, sizeof(char), count, stdout);
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(void)fclose(f);
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break;
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}
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if (ferror(stdout))
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err(FATAL, "stdout: %s", strerror(errno ? errno : EIO));
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appendx = sdone = 0;
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}
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static void
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lputs(s)
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register char *s;
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{
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register int count;
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register char *escapes, *p;
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struct winsize win;
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static int termwidth = -1;
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if (termwidth == -1)
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if (p = getenv("COLUMNS"))
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termwidth = atoi(p);
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else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
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win.ws_col > 0)
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termwidth = win.ws_col;
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else
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termwidth = 60;
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for (count = 0; *s; ++s) {
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if (count >= termwidth) {
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(void)printf("\\\n");
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count = 0;
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}
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if (isascii(*s) && isprint(*s) && *s != '\\') {
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(void)putchar(*s);
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count++;
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} else {
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escapes = "\\\a\b\f\n\r\t\v";
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(void)putchar('\\');
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if (p = strchr(escapes, *s)) {
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(void)putchar("\\abfnrtv"[p - escapes]);
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count += 2;
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} else {
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(void)printf("%03o", *(u_char *)s);
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count += 4;
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}
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}
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}
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(void)putchar('$');
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(void)putchar('\n');
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if (ferror(stdout))
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err(FATAL, "stdout: %s", strerror(errno ? errno : EIO));
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}
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static inline int
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regexec_e(preg, string, eflags, nomatch, slen)
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regex_t *preg;
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const char *string;
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int eflags, nomatch;
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size_t slen;
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{
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int eval;
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if (preg == NULL) {
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if (defpreg == NULL)
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err(FATAL, "first RE may not be empty");
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} else
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defpreg = preg;
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/* Set anchors, discounting trailing newline (if any). */
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if (slen > 0 && string[slen - 1] == '\n')
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slen--;
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match[0].rm_so = 0;
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match[0].rm_eo = slen;
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eval = regexec(defpreg, string,
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nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND);
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switch(eval) {
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case 0:
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return (1);
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case REG_NOMATCH:
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return (0);
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}
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err(FATAL, "RE error: %s", strregerror(eval, defpreg));
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/* NOTREACHED */
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}
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/*
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* regsub - perform substitutions after a regexp match
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* Based on a routine by Henry Spencer
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*/
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static void
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regsub(sp, string, src)
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SPACE *sp;
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char *string, *src;
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{
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register int len, no;
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register char c, *dst;
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|
|
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#define NEEDSP(reqlen) \
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if (sp->len >= sp->blen - (reqlen) - 1) { \
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sp->blen += (reqlen) + 1024; \
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sp->space = sp->back = xrealloc(sp->back, sp->blen); \
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dst = sp->space + sp->len; \
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}
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dst = sp->space + sp->len;
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while ((c = *src++) != '\0') {
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if (c == '&')
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no = 0;
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else if (c == '\\' && isdigit(*src))
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no = *src++ - '0';
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else
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no = -1;
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if (no < 0) { /* Ordinary character. */
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if (c == '\\' && (*src == '\\' || *src == '&'))
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c = *src++;
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NEEDSP(1);
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*dst++ = c;
|
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++sp->len;
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} else if (match[no].rm_so != -1 && match[no].rm_eo != -1) {
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len = match[no].rm_eo - match[no].rm_so;
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NEEDSP(len);
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memmove(dst, string + match[no].rm_so, len);
|
|
dst += len;
|
|
sp->len += len;
|
|
}
|
|
}
|
|
NEEDSP(1);
|
|
*dst = '\0';
|
|
}
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|
|
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/*
|
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* aspace --
|
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* Append the source space to the destination space, allocating new
|
|
* space as necessary.
|
|
*/
|
|
void
|
|
cspace(sp, p, len, spflag)
|
|
SPACE *sp;
|
|
char *p;
|
|
size_t len;
|
|
enum e_spflag spflag;
|
|
{
|
|
size_t tlen;
|
|
|
|
/* Make sure SPACE has enough memory and ramp up quickly. */
|
|
tlen = sp->len + len + 1;
|
|
if (tlen > sp->blen) {
|
|
sp->blen = tlen + 1024;
|
|
sp->space = sp->back = xrealloc(sp->back, sp->blen);
|
|
}
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|
|
|
if (spflag == REPLACE)
|
|
sp->len = 0;
|
|
|
|
memmove(sp->space + sp->len, p, len);
|
|
|
|
sp->space[sp->len += len] = '\0';
|
|
}
|
|
|
|
/*
|
|
* Close all cached opened files and report any errors
|
|
*/
|
|
void
|
|
cfclose(cp, end)
|
|
register struct s_command *cp, *end;
|
|
{
|
|
|
|
for (; cp != end; cp = cp->next)
|
|
switch(cp->code) {
|
|
case 's':
|
|
if (cp->u.s->wfd != -1 && close(cp->u.s->wfd))
|
|
err(FATAL,
|
|
"%s: %s", cp->u.s->wfile, strerror(errno));
|
|
cp->u.s->wfd = -1;
|
|
break;
|
|
case 'w':
|
|
if (cp->u.fd != -1 && close(cp->u.fd))
|
|
err(FATAL, "%s: %s", cp->t, strerror(errno));
|
|
cp->u.fd = -1;
|
|
break;
|
|
case '{':
|
|
cfclose(cp->u.c, cp->next);
|
|
break;
|
|
}
|
|
}
|