1 /* str/findnext.c - Find the next instance of a single character
2 * Copyright (C) 2001,2005 Bruce Guenter <bruce@untroubled.org>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include <string.h>
19 #include "str.h"
20
21 /** Find the next instance of the given character, on or after \c pos */
str_findnext(const str * s,char ch,unsigned pos)22 int str_findnext(const str* s, char ch, unsigned pos)
23 {
24 char* p;
25 if (pos >= s->len) return -1;
26 p = memchr(s->s+pos, ch, s->len-pos);
27 if (!p) return -1;
28 return p - s->s;
29 }
30
31 #ifdef SELFTEST_MAIN
32 MAIN
33 {
34 str s = { "01234567890123456", 16, 0 };
35 obuf_puti(&outbuf, str_findnext(&s, '4', 0)); NL();
36 obuf_puti(&outbuf, str_findnext(&s, '4', 4)); NL();
37 obuf_puti(&outbuf, str_findnext(&s, '4', 5)); NL();
38 obuf_puti(&outbuf, str_findnext(&s, '6', 7)); NL();
39 }
40 #endif
41 #ifdef SELFTEST_EXP
42 4
43 4
44 14
45 -1
46 #endif
47