strcasecmp.c (2437B)
1 /* 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifdef HAVE_DIX_CONFIG_H 31 #include <dix-config.h> 32 #endif 33 34 #include <ctype.h> 35 #include "dix.h" 36 37 #ifndef HAVE_STRCASECMP 38 int 39 xstrcasecmp(const char *str1, const char *str2) 40 { 41 const u_char *us1 = (const u_char *) str1, *us2 = (const u_char *) str2; 42 43 while (tolower(*us1) == tolower(*us2)) { 44 if (*us1++ == '\0') 45 return 0; 46 us2++; 47 } 48 49 return (tolower(*us1) - tolower(*us2)); 50 } 51 #endif 52 53 #ifndef HAVE_STRNCASECMP 54 int 55 xstrncasecmp(const char *s1, const char *s2, size_t n) 56 { 57 if (n != 0) { 58 const u_char *us1 = (const u_char *) s1, *us2 = (const u_char *) s2; 59 60 do { 61 if (tolower(*us1) != tolower(*us2++)) 62 return (tolower(*us1) - tolower(*--us2)); 63 if (*us1++ == '\0') 64 break; 65 } while (--n != 0); 66 } 67 68 return 0; 69 } 70 #endif