diff options
Diffstat (limited to 'lib/strcasecmp.c')
| -rw-r--r-- | lib/strcasecmp.c | 92 |
1 files changed, 25 insertions, 67 deletions
diff --git a/lib/strcasecmp.c b/lib/strcasecmp.c index c1bac0a..c605fb0 100644 --- a/lib/strcasecmp.c +++ b/lib/strcasecmp.c @@ -1,7 +1,5 @@ /* Case-insensitive string comparison function. - Copyright (C) 1998, 1999, 2005 Free Software Foundation, Inc. - Written by Bruno Haible <bruno@clisp.org>, 2005, - based on earlier glibc code. + Copyright (C) 1998-1999, 2005-2007 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,89 +15,49 @@ along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif +#include <config.h> /* Specification. */ -#include "strcase.h" +#include <string.h> #include <ctype.h> #include <limits.h> -#if HAVE_MBRTOWC -# include "mbuiter.h" -#endif - #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch)) /* Compare strings 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. - Note: This function may, in multibyte locales, return 0 for strings of - different lengths! */ + Note: This function does not work with multibyte strings! */ + int strcasecmp (const char *s1, const char *s2) { - if (s1 == s2) + const unsigned char *p1 = (const unsigned char *) s1; + const unsigned char *p2 = (const unsigned char *) s2; + unsigned char c1, c2; + + if (p1 == p2) return 0; - /* Be careful not to look at the entire extent of s1 or s2 until needed. - This is useful because when two strings differ, the difference is - most often already in the very few first characters. */ -#if HAVE_MBRTOWC - if (MB_CUR_MAX > 1) + do { - mbui_iterator_t iter1; - mbui_iterator_t iter2; + c1 = TOLOWER (*p1); + c2 = TOLOWER (*p2); - mbui_init (iter1, s1); - mbui_init (iter2, s2); + if (c1 == '\0') + break; - while (mbui_avail (iter1) && mbui_avail (iter2)) - { - int cmp = mb_casecmp (mbui_cur (iter1), mbui_cur (iter2)); - - if (cmp != 0) - return cmp; - - mbui_advance (iter1); - mbui_advance (iter2); - } - if (mbui_avail (iter1)) - /* s2 terminated before s1. */ - return 1; - if (mbui_avail (iter2)) - /* s1 terminated before s2. */ - return -1; - return 0; + ++p1; + ++p2; } - else -#endif - { - const unsigned char *p1 = (const unsigned char *) s1; - const unsigned char *p2 = (const unsigned char *) s2; - unsigned char c1, c2; - - do - { - c1 = TOLOWER (*p1); - c2 = TOLOWER (*p2); - - if (c1 == '\0') - break; + while (c1 == c2); - ++p1; - ++p2; - } - while (c1 == c2); - - if (UCHAR_MAX <= INT_MAX) - return c1 - c2; - else - /* On machines where 'char' and 'int' are types of the same size, the - difference of two 'unsigned char' values - including the sign bit - - doesn't fit in an 'int'. */ - return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0); - } + if (UCHAR_MAX <= INT_MAX) + return c1 - c2; + else + /* On machines where 'char' and 'int' are types of the same size, the + difference of two 'unsigned char' values - including the sign bit - + doesn't fit in an 'int'. */ + return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0); } |