165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
/* $NetBSD: regsub.c,v 1.3 2016/02/29 22:10:13 aymeric Exp $ */
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/*-
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* Copyright (c) 2015 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: regsub.c,v 1.3 2016/02/29 22:10:13 aymeric Exp $");
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#endif
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#include <sys/param.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <regex.h>
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struct str {
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char *s_ptr;
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size_t s_max;
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size_t s_len;
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int s_fixed;
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};
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#define REINCR 64
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static int
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addspace(struct str *s, size_t len)
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{
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void *v;
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if (s->s_max - s->s_len > len)
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return 0;
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if (s->s_fixed)
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return -1;
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s->s_max += len + REINCR;
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v = realloc(s->s_ptr, s->s_max);
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if (v == NULL)
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return -1;
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s->s_ptr = v;
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return 0;
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}
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static void
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addchar(struct str *s, int c)
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{
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if (addspace(s, 1) == -1)
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s->s_len++;
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else
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s->s_ptr[s->s_len++] = c;
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if (c == 0) {
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--s->s_len;
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s->s_ptr[s->s_max - 1] = c;
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}
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}
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static void
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addnstr(struct str *s, const char *buf, size_t len)
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{
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if (addspace(s, len) != -1)
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memcpy(s->s_ptr + s->s_len, buf, len);
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s->s_len += len;
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}
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static int
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initstr(struct str *s, char *buf, size_t len)
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{
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s->s_max = len;
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s->s_ptr = buf == NULL ? malloc(len) : buf;
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s->s_fixed = buf != NULL;
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s->s_len = 0;
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return s->s_ptr == NULL ? -1 : 0;
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}
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static ssize_t
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regsub1(char **buf, size_t len, const char *sub,
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const regmatch_t *rm, const char *str)
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{
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ssize_t i;
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char c;
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struct str s;
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if (initstr(&s, *buf, len) == -1)
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return -1;
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while ((c = *sub++) != '\0') {
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switch (c) {
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case '&':
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i = 0;
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break;
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case '\\':
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if (isdigit((unsigned char)*sub))
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i = *sub++ - '0';
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else
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i = -1;
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break;
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default:
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i = -1;
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break;
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}
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if (i == -1) {
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if (c == '\\' && (*sub == '\\' || *sub == '&'))
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c = *sub++;
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addchar(&s, c);
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} else if (rm[i].rm_so != -1 && rm[i].rm_eo != -1) {
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size_t l = (size_t)(rm[i].rm_eo - rm[i].rm_so);
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addnstr(&s, str + rm[i].rm_so, l);
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}
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}
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addchar(&s, '\0');
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if (!s.s_fixed) {
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if (s.s_len >= s.s_max) {
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free(s.s_ptr);
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return -1;
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}
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*buf = s.s_ptr;
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}
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return s.s_len;
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}
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ssize_t
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regnsub(char *buf, size_t len, const char *sub, const regmatch_t *rm,
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const char *str)
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{
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return regsub1(&buf, len, sub, rm, str);
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}
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ssize_t
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regasub(char **buf, const char *sub, const regmatch_t *rm, const char *str)
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{
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*buf = NULL;
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return regsub1(buf, REINCR, sub, rm, str);
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}
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