1/*	$NetBSD: stresep.c,v 1.4 2017/08/23 10:27:41 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifdef HAVE_CONFIG_H
33# include <config.h>
34#endif
35
36#include <sys/cdefs.h>
37
38#include <assert.h>
39#include <string.h>
40
41#if !defined(HAVE_STRESEP)
42char * stresep(char **stringp, const char *delim, int esc);
43/*
44 * Get next token from string *stringp, where tokens are possibly-empty
45 * strings separated by characters from delim. If esc is not NUL, then
46 * the characters followed by esc are ignored and are not taken into account
47 * when splitting the string.
48 *
49 * Writes NULs into the string at *stringp to end tokens.
50 * delim need not remain constant from call to call.
51 * On return, *stringp points past the last NUL written (if there might
52 * be further tokens), or is NULL (if there are definitely no more tokens).
53 *
54 * If *stringp is NULL, stresep returns NULL.
55 */
56char *
57stresep(char **stringp, const char *delim, int esc)
58{
59	char *s;
60	const char *spanp;
61	int c, sc;
62	size_t l;
63	char *tok;
64
65	if (stringp == NULL || delim == NULL)
66		return NULL;
67
68	if ((s = *stringp) == NULL)
69		return NULL;
70	l = strlen(s) + 1;
71	for (tok = s;;) {
72		c = *s++;
73		l--;
74		while (esc != '\0' && c == esc) {
75			memmove(s - 1, s, l);
76			c = *s++;
77			l--;
78		}
79		spanp = delim;
80		do {
81			if ((sc = *spanp++) == c) {
82				if (c == '\0')
83					s = NULL;
84				else
85					s[-1] = '\0';
86				*stringp = s;
87				return tok;
88			}
89		} while (sc != '\0');
90	}
91}
92#endif
93
94