diff options
author | Sichen Zhao <1473996754@qq.com> | 2017-08-25 10:35:38 +0300 |
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committer | Corinna Vinschen <corinna@vinschen.de> | 2017-08-25 19:00:46 +0300 |
commit | 3437665ac85455c18fbc4cc616fe2aeb373f6552 (patch) | |
tree | 526075c5dd1dfb2125a5138019ef39ff8899f85b /newlib/libc/string | |
parent | a4961ccd3f0e3513bb32a0e135348ad303e7599d (diff) |
Import strnstr.c from FreeBSD.
Diffstat (limited to 'newlib/libc/string')
-rw-r--r-- | newlib/libc/string/strnstr.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/newlib/libc/string/strnstr.c b/newlib/libc/string/strnstr.c new file mode 100644 index 000000000..da5e5bdcb --- /dev/null +++ b/newlib/libc/string/strnstr.c @@ -0,0 +1,65 @@ +/*- + * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org> + * 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. + * 3. 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)strstr.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: head/lib/libc/string/strnstr.c 251069 2013-05-28 20:57:40Z emaste $"); + +#include <string.h> + +/* + * Find the first occurrence of find in s, where the search is limited to the + * first slen characters of s. + */ +char * +strnstr(const char *s, const char *find, size_t slen) +{ + char c, sc; + size_t len; + + if ((c = *find++) != '\0') { + len = strlen(find); + do { + do { + if (slen-- < 1 || (sc = *s++) == '\0') + return (NULL); + } while (sc != c); + if (len > slen) + return (NULL); + } while (strncmp(s, find, len) != 0); + s--; + } + return ((char *)s); +} |