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/* $OpenBSD: sub.c,v 1.16 2016/08/02 20:17:06 martijn Exp $ */
/* $NetBSD: sub.c,v 1.4 1995/03/21 09:04:50 cgd Exp $ */
/* sub.c: This file contains the substitution routines for the ed
line editor */
/*-
* Copyright (c) 1993 Andrew Moore, Talke Studio.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <limits.h>
#include <regex.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ed.h"
static char *extract_subst_template(void);
static int substitute_matching_text(regex_t *, line_t *, int, int);
static int apply_subst_template(char *, regmatch_t *, int, int);
static char *rhbuf; /* rhs substitution buffer */
static int rhbufsz; /* rhs substitution buffer size */
static int rhbufi; /* rhs substitution buffer index */
/* extract_subst_tail: extract substitution tail from the command buffer */
int
extract_subst_tail(int *flagp, int *np)
{
char delimiter;
*flagp = *np = 0;
if ((delimiter = *ibufp) == '\n') {
rhbufi = 0;
*flagp = GPR;
return 0;
} else if (extract_subst_template() == NULL)
return ERR;
else if (*ibufp == '\n') {
*flagp = GPR;
return 0;
} else if (*ibufp == delimiter)
ibufp++;
if ('1' <= *ibufp && *ibufp <= '9') {
STRTOI(*np, ibufp);
return 0;
} else if (*ibufp == 'g') {
ibufp++;
*flagp = GSG;
return 0;
}
return 0;
}
/* extract_subst_template: return pointer to copy of substitution template
in the command buffer */
static char *
extract_subst_template(void)
{
int n = 0;
int i = 0;
char c;
char delimiter = *ibufp++;
if (*ibufp == '%' && *(ibufp + 1) == delimiter) {
ibufp++;
if (!rhbuf)
seterrmsg("no previous substitution");
return rhbuf;
}
while (*ibufp != delimiter) {
REALLOC(rhbuf, rhbufsz, i + 2, NULL);
if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0') {
i--, ibufp--;
break;
} else if (c != '\\')
;
else if ((rhbuf[i++] = *ibufp++) != '\n')
;
else if (!isglobal) {
while ((n = get_tty_line()) == 0 ||
(n > 0 && ibuf[n - 1] != '\n'))
clearerr(stdin);
if (n < 0)
return NULL;
}
}
REALLOC(rhbuf, rhbufsz, i + 1, NULL);
rhbuf[rhbufi = i] = '\0';
return rhbuf;
}
static char *rbuf; /* substitute_matching_text buffer */
static int rbufsz; /* substitute_matching_text buffer size */
/* search_and_replace: for each line in a range, change text matching a pattern
according to a substitution template; return status */
int
search_and_replace(regex_t *pat, int gflag, int kth)
{
undo_t *up;
char *txt;
char *eot;
int lc;
int xa = current_addr;
int nsubs = 0;
line_t *lp;
int len;
current_addr = first_addr - 1;
for (lc = 0; lc <= second_addr - first_addr; lc++) {
lp = get_addressed_line_node(++current_addr);
if ((len = substitute_matching_text(pat, lp, gflag, kth)) < 0)
return ERR;
else if (len) {
up = NULL;
if (delete_lines(current_addr, current_addr) < 0)
return ERR;
txt = rbuf;
eot = rbuf + len;
SPL1();
do {
if ((txt = put_sbuf_line(txt)) == NULL) {
SPL0();
return ERR;
} else if (up)
up->t = get_addressed_line_node(current_addr);
else if ((up = push_undo_stack(UADD,
current_addr, current_addr)) == NULL) {
SPL0();
return ERR;
}
} while (txt != eot);
SPL0();
nsubs++;
xa = current_addr;
}
}
current_addr = xa;
if (nsubs == 0 && !(gflag & GLB)) {
seterrmsg("no match");
return ERR;
} else if ((gflag & (GPR | GLS | GNP)) &&
display_lines(current_addr, current_addr, gflag) < 0)
return ERR;
return 0;
}
/* substitute_matching_text: replace text matched by a pattern according to
a substitution template; return length of rbuf if changed, 0 if unchanged, or
ERR on error */
static int
substitute_matching_text(regex_t *pat, line_t *lp, int gflag, int kth)
{
int off = 0;
int changed = 0;
int matchno = 0;
int i = 0;
int inf = 0;
regmatch_t rm[SE_MAX];
char *txt;
char *eot, *eom;
if ((eom = txt = get_sbuf_line(lp)) == NULL)
return ERR;
if (isbinary)
NUL_TO_NEWLINE(txt, lp->len);
eot = txt + lp->len;
if (!regexec(pat, txt, SE_MAX, rm, 0)) {
do {
if (!kth || kth == ++matchno) {
changed = 1;
i = rm[0].rm_so - (eom - txt);
REALLOC(rbuf, rbufsz, off + i, ERR);
if (isbinary)
NEWLINE_TO_NUL(eom,
rm[0].rm_eo - (eom - txt));
memcpy(rbuf + off, eom, i);
off += i;
if ((off = apply_subst_template(txt, rm, off,
pat->re_nsub)) < 0)
return ERR;
eom = txt + rm[0].rm_eo;
if (kth)
break;
}
if (rm[0].rm_so == rm[0].rm_eo)
inf = 1;
rm[0].rm_so = rm[0].rm_eo;
rm[0].rm_eo = lp->len;
} while (rm[0].rm_so < lp->len &&
(!changed || ((gflag & GSG) && !inf)) &&
!regexec(pat, txt, SE_MAX, rm, REG_STARTEND | REG_NOTBOL));
i = eot - eom;
REALLOC(rbuf, rbufsz, off + i + 2, ERR);
if (i > 0 && (gflag & GSG) && inf) {
seterrmsg("infinite substitution loop");
return ERR;
}
if (isbinary)
NEWLINE_TO_NUL(eom, i);
memcpy(rbuf + off, eom, i);
memcpy(rbuf + off + i, "\n", 2);
}
return changed ? off + i + 1 : 0;
}
/* apply_subst_template: modify text according to a substitution template;
return offset to end of modified text */
static int
apply_subst_template(char *boln, regmatch_t *rm, int off, int re_nsub)
{
int j = 0;
int k = 0;
int n;
char *sub = rhbuf;
for (; sub - rhbuf < rhbufi; sub++)
if (*sub == '&') {
j = rm[0].rm_so;
k = rm[0].rm_eo;
REALLOC(rbuf, rbufsz, off + k - j, ERR);
while (j < k)
rbuf[off++] = boln[j++];
} else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' &&
(n = *sub - '0') <= re_nsub) {
j = rm[n].rm_so;
k = rm[n].rm_eo;
REALLOC(rbuf, rbufsz, off + k - j, ERR);
while (j < k)
rbuf[off++] = boln[j++];
} else {
REALLOC(rbuf, rbufsz, off + 1, ERR);
rbuf[off++] = *sub;
}
REALLOC(rbuf, rbufsz, off + 1, ERR);
rbuf[off] = '\0';
return off;
}
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