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269 lines
6.7 KiB
C
269 lines
6.7 KiB
C
/* sub.c: This file contains the substitution routines for the ed
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line editor */
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/*-
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* Copyright (c) 1993 Andrew Moore, Talke Studio.
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $Id: sub.c,v 1.3 1994/09/24 02:55:31 davidg Exp $
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*/
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#ifndef lint
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static char *rcsid = "@(#)sub.c,v 1.1 1994/02/01 00:34:44 alm Exp";
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#endif /* not lint */
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#include "ed.h"
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char *rhbuf; /* rhs substitution buffer */
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int rhbufsz; /* rhs substitution buffer size */
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int rhbufi; /* rhs substitution buffer index */
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/* extract_subst_tail: extract substitution tail from the command buffer */
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int
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extract_subst_tail(flagp, np)
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int *flagp;
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int *np;
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{
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char delimiter;
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*flagp = *np = 0;
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if ((delimiter = *ibufp) == '\n') {
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rhbufi = 0;
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*flagp = GPR;
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return 0;
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} else if (extract_subst_template() == NULL)
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return ERR;
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else if (*ibufp == '\n') {
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*flagp = GPR;
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return 0;
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} else if (*ibufp == delimiter)
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ibufp++;
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if ('1' <= *ibufp && *ibufp <= '9') {
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STRTOL(*np, ibufp);
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return 0;
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} else if (*ibufp == 'g') {
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ibufp++;
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*flagp = GSG;
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return 0;
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}
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return 0;
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}
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/* extract_subst_template: return pointer to copy of substitution template
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in the command buffer */
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char *
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extract_subst_template()
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{
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int n = 0;
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int i = 0;
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char c;
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char delimiter = *ibufp++;
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if (*ibufp == '%' && *(ibufp + 1) == delimiter) {
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ibufp++;
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if (!rhbuf) sprintf(errmsg, "no previous substitution");
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return rhbuf;
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}
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while (*ibufp != delimiter) {
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REALLOC(rhbuf, rhbufsz, i + 2, NULL);
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if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0') {
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i--, ibufp--;
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break;
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} else if (c != '\\')
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;
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else if ((rhbuf[i++] = *ibufp++) != '\n')
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;
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else if (!isglobal) {
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while ((n = get_tty_line()) == 0 ||
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n > 0 && ibuf[n - 1] != '\n')
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clearerr(stdin);
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if (n < 0)
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return NULL;
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}
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}
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REALLOC(rhbuf, rhbufsz, i + 1, NULL);
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rhbuf[rhbufi = i] = '\0';
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return rhbuf;
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}
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char *rbuf; /* substitute_matching_text buffer */
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int rbufsz; /* substitute_matching_text buffer size */
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/* search_and_replace: for each line in a range, change text matching a pattern
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according to a substitution template; return status */
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int
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search_and_replace(pat, gflag, kth)
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pattern_t *pat;
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int gflag;
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int kth;
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{
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undo_t *up;
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char *txt;
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char *eot;
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long lc;
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long xa = current_addr;
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int nsubs = 0;
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line_t *lp;
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int len;
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current_addr = first_addr - 1;
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for (lc = 0; lc <= second_addr - first_addr; lc++) {
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lp = get_addressed_line_node(++current_addr);
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if ((len = substitute_matching_text(pat, lp, gflag, kth)) < 0)
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return ERR;
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else if (len) {
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up = NULL;
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if (delete_lines(current_addr, current_addr) < 0)
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return ERR;
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txt = rbuf;
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eot = rbuf + len;
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SPL1();
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do {
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if ((txt = put_sbuf_line(txt)) == NULL) {
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SPL0();
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return ERR;
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} else if (up)
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up->t = get_addressed_line_node(current_addr);
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else if ((up = push_undo_stack(UADD,
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current_addr, current_addr)) == NULL) {
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SPL0();
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return ERR;
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}
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} while (txt != eot);
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SPL0();
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nsubs++;
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xa = current_addr;
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}
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}
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current_addr = xa;
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if (nsubs == 0 && !(gflag & GLB)) {
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sprintf(errmsg, "no match");
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return ERR;
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} else if ((gflag & (GPR | GLS | GNP)) &&
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display_lines(current_addr, current_addr, gflag) < 0)
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return ERR;
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return 0;
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}
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/* substitute_matching_text: replace text matched by a pattern according to
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a substitution template; return pointer to the modified text */
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int
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substitute_matching_text(pat, lp, gflag, kth)
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pattern_t *pat;
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line_t *lp;
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int gflag;
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int kth;
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{
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int off = 0;
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int changed = 0;
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int matchno = 0;
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int i = 0;
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regmatch_t rm[SE_MAX];
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char *txt;
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char *eot;
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if ((txt = get_sbuf_line(lp)) == NULL)
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return ERR;
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if (isbinary)
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NUL_TO_NEWLINE(txt, lp->len);
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eot = txt + lp->len;
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if (!regexec(pat, txt, SE_MAX, rm, 0)) {
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do {
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if (!kth || kth == ++matchno) {
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changed++;
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i = rm[0].rm_so;
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REALLOC(rbuf, rbufsz, off + i, ERR);
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if (isbinary)
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NEWLINE_TO_NUL(txt, rm[0].rm_eo);
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memcpy(rbuf + off, txt, i);
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off += i;
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if ((off = apply_subst_template(txt, rm, off,
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pat->re_nsub)) < 0)
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return ERR;
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} else {
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i = rm[0].rm_eo;
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REALLOC(rbuf, rbufsz, off + i, ERR);
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if (isbinary)
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NEWLINE_TO_NUL(txt, i);
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memcpy(rbuf + off, txt, i);
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off += i;
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}
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txt += rm[0].rm_eo;
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} while (*txt && (!changed || (gflag & GSG) && rm[0].rm_eo) &&
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!regexec(pat, txt, SE_MAX, rm, REG_NOTBOL));
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i = eot - txt;
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REALLOC(rbuf, rbufsz, off + i + 2, ERR);
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if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) {
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sprintf(errmsg, "infinite substitution loop");
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return ERR;
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}
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if (isbinary)
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NEWLINE_TO_NUL(txt, i);
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memcpy(rbuf + off, txt, i);
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memcpy(rbuf + off + i, "\n", 2);
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}
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return changed ? off + i + 1 : 0;
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}
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/* apply_subst_template: modify text according to a substitution template;
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return offset to end of modified text */
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int
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apply_subst_template(boln, rm, off, re_nsub)
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char *boln;
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regmatch_t *rm;
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int off;
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int re_nsub;
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{
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int j = 0;
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int k = 0;
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int n;
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char *sub = rhbuf;
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for (; sub - rhbuf < rhbufi; sub++)
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if (*sub == '&') {
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j = rm[0].rm_so;
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k = rm[0].rm_eo;
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REALLOC(rbuf, rbufsz, off + k - j, ERR);
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while (j < k)
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rbuf[off++] = boln[j++];
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} else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' &&
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(n = *sub - '0') <= re_nsub) {
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j = rm[n].rm_so;
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k = rm[n].rm_eo;
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REALLOC(rbuf, rbufsz, off + k - j, ERR);
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while (j < k)
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rbuf[off++] = boln[j++];
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} else {
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REALLOC(rbuf, rbufsz, off + 1, ERR);
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rbuf[off++] = *sub;
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}
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REALLOC(rbuf, rbufsz, off + 1, ERR);
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rbuf[off] = '\0';
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return off;
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}
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