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Diffstat (limited to 'newlib/libc/string/strcasestr.c')
| -rw-r--r-- | newlib/libc/string/strcasestr.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/newlib/libc/string/strcasestr.c b/newlib/libc/string/strcasestr.c new file mode 100644 index 000000000..f1c14a08b --- /dev/null +++ b/newlib/libc/string/strcasestr.c @@ -0,0 +1,99 @@ +/* +FUNCTION + <<strcasestr>>---case-insensitive character string search + +INDEX + strcasestr + +ANSI_SYNOPSIS + #include <string.h> + char *strcasestr(const char *<[s]>, const char *<[find]>); + +TRAD_SYNOPSIS + #include <string.h> + int strcasecmp(<[s]>, <[find]>) + char *<[s]>; + char *<[find]>; + +DESCRIPTION + <<strcasestr>> searchs the string <[s]> for + the first occurrence of the sequence <[find]>. <<strcasestr>> + is identical to <<strstr>> except the search is + case-insensitive. + +RETURNS + + A pointer to the first case-insensitive occurrence of the sequence + <[find]> or <<NULL>> if no match was found. + +PORTABILITY +<<strcasestr>> is in the Berkeley Software Distribution. + +<<strcasestr>> requires no supporting OS subroutines. It uses +tolower() from elsewhere in this library. + +QUICKREF + strcasestr +*/ + +/*- + * 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: /repoman/r/ncvs/src/lib/libc/string/strcasestr.c,v 1.4 2007/01/09 00:28:12 imp Exp $"); + +#include <ctype.h> +#include <string.h> + +/* + * Find the first occurrence of find in s, ignore case. + */ +char * +strcasestr(s, find) + const char *s, *find; +{ + char c, sc; + size_t len; + + if ((c = *find++) != 0) { + c = tolower((unsigned char)c); + len = strlen(find); + do { + do { + if ((sc = *s++) == 0) + return (NULL); + } while ((char)tolower((unsigned char)sc) != c); + } while (strncasecmp(s, find, len) != 0); + s--; + } + return ((char *)s); +} |