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)
42 char * 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 */
56 char *
stresep(char ** stringp,const char * delim,int esc)57 stresep(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