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glibc/string/strcasecmp.c
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifdef HAVE_CONFIG_H | |
# include <config.h> | |
#endif | |
#include <ctype.h> | |
#include <string.h> | |
#ifndef _LIBC | |
# define __strcasecmp strcasecmp | |
# define TOLOWER(Ch) tolower (Ch) | |
#else | |
# include <locale/localeinfo.h> | |
# ifdef USE_IN_EXTENDED_LOCALE_MODEL | |
# define __strcasecmp __strcasecmp_l | |
# endif | |
# define TOLOWER(Ch) __tolower_l ((Ch), loc) | |
#endif | |
#ifdef USE_IN_EXTENDED_LOCALE_MODEL | |
# define LOCALE_PARAM , __locale_t loc | |
#else | |
# define LOCALE_PARAM | |
#endif | |
/* Compare S1 and S2, ignoring case, returning less than, equal to or | |
greater than zero if S1 is lexicographically less than, | |
equal to or greater than S2. */ | |
int | |
__strcasecmp (const char *s1, const char *s2 LOCALE_PARAM) | |
{ | |
#if defined _LIBC && !defined USE_IN_EXTENDED_LOCALE_MODEL | |
__locale_t loc = _NL_CURRENT_LOCALE; | |
#endif | |
const unsigned char *p1 = (const unsigned char *) s1; | |
const unsigned char *p2 = (const unsigned char *) s2; | |
int result; | |
if (p1 == p2) | |
return 0; | |
while ((result = TOLOWER (*p1) - TOLOWER (*p2++)) == 0) | |
if (*p1++ == '\0') | |
break; | |
return result; | |
} | |
#ifndef __strcasecmp | |
libc_hidden_def (__strcasecmp) | |
weak_alias (__strcasecmp, strcasecmp) | |
#endif |