diff options
| -rw-r--r-- | sys/libkern/memchr.c | 51 | ||||
| -rw-r--r-- | sys/sys/libkern.h | 1 |
2 files changed, 52 insertions, 0 deletions
diff --git a/sys/libkern/memchr.c b/sys/libkern/memchr.c new file mode 100644 index 0000000..a00ea6d --- /dev/null +++ b/sys/libkern/memchr.c @@ -0,0 +1,51 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/libkern.h> +#include <sys/param.h> + +void * +memchr(const void *s, int c, size_t n) +{ + if (n != 0) { + const unsigned char *p = s; + + do { + if (*p++ == (unsigned char)c) + return ((void *)(uintptr_t)(p - 1)); + } while (--n != 0); + } + return (NULL); +} diff --git a/sys/sys/libkern.h b/sys/sys/libkern.h index 42fbb37..ebba374 100644 --- a/sys/sys/libkern.h +++ b/sys/sys/libkern.h @@ -92,6 +92,7 @@ int flsl(long); int fnmatch(const char *, const char *, int); void gets(char *, size_t, int); int locc(int, char *, u_int); +void *memchr(const void *s, int c, size_t n); int memcmp(const void *b1, const void *b2, size_t len); void qsort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *)); |
