xref: /xnu-11215.41.3/libsyscall/wrappers/string/index.c (revision 33de042d024d46de5ff4e89f2471de6608e37fa4)
1*33de042dSApple OSS Distributions /*-
2*33de042dSApple OSS Distributions  * Copyright (c) 1990, 1993
3*33de042dSApple OSS Distributions  *	The Regents of the University of California.  All rights reserved.
4*33de042dSApple OSS Distributions  *
5*33de042dSApple OSS Distributions  * Redistribution and use in source and binary forms, with or without
6*33de042dSApple OSS Distributions  * modification, are permitted provided that the following conditions
7*33de042dSApple OSS Distributions  * are met:
8*33de042dSApple OSS Distributions  * 1. Redistributions of source code must retain the above copyright
9*33de042dSApple OSS Distributions  *    notice, this list of conditions and the following disclaimer.
10*33de042dSApple OSS Distributions  * 2. Redistributions in binary form must reproduce the above copyright
11*33de042dSApple OSS Distributions  *    notice, this list of conditions and the following disclaimer in the
12*33de042dSApple OSS Distributions  *    documentation and/or other materials provided with the distribution.
13*33de042dSApple OSS Distributions  * 4. Neither the name of the University nor the names of its contributors
14*33de042dSApple OSS Distributions  *    may be used to endorse or promote products derived from this software
15*33de042dSApple OSS Distributions  *    without specific prior written permission.
16*33de042dSApple OSS Distributions  *
17*33de042dSApple OSS Distributions  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18*33de042dSApple OSS Distributions  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*33de042dSApple OSS Distributions  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*33de042dSApple OSS Distributions  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21*33de042dSApple OSS Distributions  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*33de042dSApple OSS Distributions  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*33de042dSApple OSS Distributions  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*33de042dSApple OSS Distributions  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*33de042dSApple OSS Distributions  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*33de042dSApple OSS Distributions  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*33de042dSApple OSS Distributions  * SUCH DAMAGE.
28*33de042dSApple OSS Distributions  */
29*33de042dSApple OSS Distributions 
30*33de042dSApple OSS Distributions #include "strings.h"
31*33de042dSApple OSS Distributions 
32*33de042dSApple OSS Distributions __attribute__((visibility("hidden")))
33*33de042dSApple OSS Distributions char *
_libkernel_strchr(const char * p,int ch)34*33de042dSApple OSS Distributions _libkernel_strchr(const char *p, int ch)
35*33de042dSApple OSS Distributions {
36*33de042dSApple OSS Distributions 	char c;
37*33de042dSApple OSS Distributions 
38*33de042dSApple OSS Distributions 	c = ch;
39*33de042dSApple OSS Distributions 	for (;; ++p) {
40*33de042dSApple OSS Distributions 		if (*p == c) {
41*33de042dSApple OSS Distributions 			return (char *)p;
42*33de042dSApple OSS Distributions 		}
43*33de042dSApple OSS Distributions 		if (*p == '\0') {
44*33de042dSApple OSS Distributions 			return NULL;
45*33de042dSApple OSS Distributions 		}
46*33de042dSApple OSS Distributions 	}
47*33de042dSApple OSS Distributions 	/* NOTREACHED */
48*33de042dSApple OSS Distributions }
49