xref: /xnu-11215.81.4/libsyscall/wrappers/string/index.c (revision d4514f0bc1d3f944c22d92e68b646ac3fb40d452)
1*d4514f0bSApple OSS Distributions /*-
2*d4514f0bSApple OSS Distributions  * Copyright (c) 1990, 1993
3*d4514f0bSApple OSS Distributions  *	The Regents of the University of California.  All rights reserved.
4*d4514f0bSApple OSS Distributions  *
5*d4514f0bSApple OSS Distributions  * Redistribution and use in source and binary forms, with or without
6*d4514f0bSApple OSS Distributions  * modification, are permitted provided that the following conditions
7*d4514f0bSApple OSS Distributions  * are met:
8*d4514f0bSApple OSS Distributions  * 1. Redistributions of source code must retain the above copyright
9*d4514f0bSApple OSS Distributions  *    notice, this list of conditions and the following disclaimer.
10*d4514f0bSApple OSS Distributions  * 2. Redistributions in binary form must reproduce the above copyright
11*d4514f0bSApple OSS Distributions  *    notice, this list of conditions and the following disclaimer in the
12*d4514f0bSApple OSS Distributions  *    documentation and/or other materials provided with the distribution.
13*d4514f0bSApple OSS Distributions  * 4. Neither the name of the University nor the names of its contributors
14*d4514f0bSApple OSS Distributions  *    may be used to endorse or promote products derived from this software
15*d4514f0bSApple OSS Distributions  *    without specific prior written permission.
16*d4514f0bSApple OSS Distributions  *
17*d4514f0bSApple OSS Distributions  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18*d4514f0bSApple OSS Distributions  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*d4514f0bSApple OSS Distributions  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*d4514f0bSApple OSS Distributions  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21*d4514f0bSApple OSS Distributions  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*d4514f0bSApple OSS Distributions  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*d4514f0bSApple OSS Distributions  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*d4514f0bSApple OSS Distributions  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*d4514f0bSApple OSS Distributions  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*d4514f0bSApple OSS Distributions  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*d4514f0bSApple OSS Distributions  * SUCH DAMAGE.
28*d4514f0bSApple OSS Distributions  */
29*d4514f0bSApple OSS Distributions 
30*d4514f0bSApple OSS Distributions #include "strings.h"
31*d4514f0bSApple OSS Distributions 
32*d4514f0bSApple OSS Distributions __attribute__((visibility("hidden")))
33*d4514f0bSApple OSS Distributions char *
_libkernel_strchr(const char * p,int ch)34*d4514f0bSApple OSS Distributions _libkernel_strchr(const char *p, int ch)
35*d4514f0bSApple OSS Distributions {
36*d4514f0bSApple OSS Distributions 	char c;
37*d4514f0bSApple OSS Distributions 
38*d4514f0bSApple OSS Distributions 	c = ch;
39*d4514f0bSApple OSS Distributions 	for (;; ++p) {
40*d4514f0bSApple OSS Distributions 		if (*p == c) {
41*d4514f0bSApple OSS Distributions 			return (char *)p;
42*d4514f0bSApple OSS Distributions 		}
43*d4514f0bSApple OSS Distributions 		if (*p == '\0') {
44*d4514f0bSApple OSS Distributions 			return NULL;
45*d4514f0bSApple OSS Distributions 		}
46*d4514f0bSApple OSS Distributions 	}
47*d4514f0bSApple OSS Distributions 	/* NOTREACHED */
48*d4514f0bSApple OSS Distributions }
49