mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-17 08:00:48 +01:00
0bca9fd9dc
request. So the command: /pattern/;/ finds the second line containing "pattern" after the current line. Caveat: The commands `st' and `sr' are now both legal and have very different meanings. This is because ed(1) extends POSIX to include the old Berkeley syntax s[rgp]*. (So should two slashes still be required in the case of the substitute command, as SunOS ed does?)
148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/* re.c: This file contains the regular expression interface routines for
|
|
the ed line editor. */
|
|
/*-
|
|
* Copyright (c) 1993 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley
|
|
* by Andrew Moore, Talke Studio.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)re.c 5.5 (Berkeley) 3/28/93";
|
|
#endif /* not lint */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "ed.h"
|
|
|
|
extern char *lhbuf;
|
|
extern int lhbufsz;
|
|
extern char *ibufp;
|
|
extern int ibufsz;
|
|
extern int patlock;
|
|
|
|
char errmsg[MAXFNAME + 40] = "";
|
|
|
|
/* optpat: return pointer to compiled pattern from command buffer */
|
|
pattern_t *
|
|
optpat()
|
|
{
|
|
static pattern_t *exp = NULL;
|
|
|
|
char *exps;
|
|
char delim;
|
|
int n;
|
|
|
|
if ((delim = *ibufp) == ' ') {
|
|
sprintf(errmsg, "invalid pattern delimiter");
|
|
return NULL;
|
|
} else if (delim == '\n' || *++ibufp == '\n' || *ibufp == delim) {
|
|
if (!exp) sprintf(errmsg, "no previous pattern");
|
|
return exp;
|
|
} else if ((exps = getlhs(delim)) == NULL)
|
|
return NULL;
|
|
/* buffer alloc'd && not reserved */
|
|
if (exp && !patlock)
|
|
regfree(exp);
|
|
else if ((exp = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) {
|
|
fprintf(stderr, "%s\n", strerror(errno));
|
|
sprintf(errmsg, "out of memory");
|
|
return NULL;
|
|
}
|
|
patlock = 0;
|
|
if (n = regcomp(exp, exps, 0)) {
|
|
regerror(n, exp, errmsg, sizeof errmsg);
|
|
free(exp);
|
|
return exp = NULL;
|
|
}
|
|
return exp;
|
|
}
|
|
|
|
|
|
extern int isbinary;
|
|
|
|
/* getlhs: copy a pattern string from the command buffer; return pointer
|
|
to the copy */
|
|
char *
|
|
getlhs(delim)
|
|
int delim;
|
|
{
|
|
char *nd;
|
|
int len;
|
|
|
|
for (nd = ibufp; *nd != delim && *nd != '\n'; nd++)
|
|
switch (*nd) {
|
|
default:
|
|
break;
|
|
case '[':
|
|
if ((nd = ccl(++nd)) == NULL) {
|
|
sprintf(errmsg, "unbalanced brackets ([])");
|
|
return NULL;
|
|
}
|
|
break;
|
|
case '\\':
|
|
if (*++nd == '\n') {
|
|
sprintf(errmsg, "trailing backslash (\\)");
|
|
return NULL;
|
|
}
|
|
break;
|
|
}
|
|
len = nd - ibufp;
|
|
CKBUF(lhbuf, lhbufsz, len + 1, NULL);
|
|
memcpy(lhbuf, ibufp, len);
|
|
lhbuf[len] = '\0';
|
|
ibufp = nd;
|
|
return (isbinary) ? nultonl(lhbuf, len) : lhbuf;
|
|
}
|
|
|
|
|
|
/* ccl: expand a POSIX character class */
|
|
char *
|
|
ccl(s)
|
|
char *s;
|
|
{
|
|
int c, d;
|
|
|
|
if (*s == '^')
|
|
s++;
|
|
if (*s == ']')
|
|
s++;
|
|
for (; *s != ']' && *s != '\n'; s++)
|
|
if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '='))
|
|
for (s++, c = *++s; *s != ']' || c != d; s++)
|
|
if ((c = *s) == '\n')
|
|
return NULL;
|
|
return (*s == ']') ? s : NULL;
|
|
}
|