Nut/OS  4.10.3
API Reference
memchr.c
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00001 /*
00002  * Copyright (C) 2004 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  *-
00033  * Copyright (c) 1990 The Regents of the University of California.
00034  * All rights reserved.
00035  *
00036  * This code is derived from software contributed to Berkeley by
00037  * Chris Torek.
00038  *
00039  * Redistribution and use in source and binary forms, with or without
00040  * modification, are permitted provided that the following conditions
00041  * are met:
00042  * 1. Redistributions of source code must retain the above copyright
00043  *    notice, this list of conditions and the following disclaimer.
00044  * 2. Redistributions in binary form must reproduce the above copyright
00045  *    notice, this list of conditions and the following disclaimer in the
00046  *    documentation and/or other materials provided with the distribution.
00047  * 3. Neither the name of the University nor the names of its contributors
00048  *    may be used to endorse or promote products derived from this software
00049  *    without specific prior written permission.
00050  *
00051  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00052  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00053  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00054  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00055  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00056  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00057  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00058  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00059  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00060  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00061  * SUCH DAMAGE.
00062  */
00063 
00064 /*
00065  * $Log$
00066  * Revision 1.1  2004/09/08 10:23:43  haraldkipp
00067  * Generic C string library added
00068  *
00069  */
00070 
00071 #include <compiler.h>
00072 #include <string.h>
00073 
00078 
00091 void *memchr(CONST void *s, int c, size_t n)
00092 {
00093     if (n) {
00094         CONST unsigned char *p = s;
00095 
00096         do {
00097             if (*p++ == (unsigned char) c) {
00098                 return (void *) (p - 1);
00099             }
00100         } while (--n);
00101     }
00102     return 0;
00103 }
00104