xref: /xnu-10002.1.13/libsyscall/wrappers/string/index.c (revision 1031c584a5e37aff177559b9f69dbd3c8c3fd30a)
1*1031c584SApple OSS Distributions /*-
2*1031c584SApple OSS Distributions  * Copyright (c) 1990, 1993
3*1031c584SApple OSS Distributions  *	The Regents of the University of California.  All rights reserved.
4*1031c584SApple OSS Distributions  *
5*1031c584SApple OSS Distributions  * Redistribution and use in source and binary forms, with or without
6*1031c584SApple OSS Distributions  * modification, are permitted provided that the following conditions
7*1031c584SApple OSS Distributions  * are met:
8*1031c584SApple OSS Distributions  * 1. Redistributions of source code must retain the above copyright
9*1031c584SApple OSS Distributions  *    notice, this list of conditions and the following disclaimer.
10*1031c584SApple OSS Distributions  * 2. Redistributions in binary form must reproduce the above copyright
11*1031c584SApple OSS Distributions  *    notice, this list of conditions and the following disclaimer in the
12*1031c584SApple OSS Distributions  *    documentation and/or other materials provided with the distribution.
13*1031c584SApple OSS Distributions  * 4. Neither the name of the University nor the names of its contributors
14*1031c584SApple OSS Distributions  *    may be used to endorse or promote products derived from this software
15*1031c584SApple OSS Distributions  *    without specific prior written permission.
16*1031c584SApple OSS Distributions  *
17*1031c584SApple OSS Distributions  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18*1031c584SApple OSS Distributions  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*1031c584SApple OSS Distributions  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*1031c584SApple OSS Distributions  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21*1031c584SApple OSS Distributions  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*1031c584SApple OSS Distributions  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*1031c584SApple OSS Distributions  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*1031c584SApple OSS Distributions  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*1031c584SApple OSS Distributions  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*1031c584SApple OSS Distributions  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*1031c584SApple OSS Distributions  * SUCH DAMAGE.
28*1031c584SApple OSS Distributions  */
29*1031c584SApple OSS Distributions 
30*1031c584SApple OSS Distributions #include "strings.h"
31*1031c584SApple OSS Distributions 
32*1031c584SApple OSS Distributions __attribute__((visibility("hidden")))
33*1031c584SApple OSS Distributions char *
_libkernel_strchr(const char * p,int ch)34*1031c584SApple OSS Distributions _libkernel_strchr(const char *p, int ch)
35*1031c584SApple OSS Distributions {
36*1031c584SApple OSS Distributions 	char c;
37*1031c584SApple OSS Distributions 
38*1031c584SApple OSS Distributions 	c = ch;
39*1031c584SApple OSS Distributions 	for (;; ++p) {
40*1031c584SApple OSS Distributions 		if (*p == c) {
41*1031c584SApple OSS Distributions 			return (char *)p;
42*1031c584SApple OSS Distributions 		}
43*1031c584SApple OSS Distributions 		if (*p == '\0') {
44*1031c584SApple OSS Distributions 			return NULL;
45*1031c584SApple OSS Distributions 		}
46*1031c584SApple OSS Distributions 	}
47*1031c584SApple OSS Distributions 	/* NOTREACHED */
48*1031c584SApple OSS Distributions }
49