| /* c-strcasecmp.c -- case insensitive string comparator in C locale |
| Copyright (C) 1998-1999, 2005-2006, 2009-2021 Free Software Foundation, Inc. |
| |
| This file 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. |
| |
| This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include "c-strcase.h" |
| |
| #include <limits.h> |
| |
| #include "c-ctype.h" |
| |
| int |
| c_strcasecmp (const char *s1, const char *s2) |
| { |
| register const unsigned char *p1 = (const unsigned char *) s1; |
| register const unsigned char *p2 = (const unsigned char *) s2; |
| unsigned char c1, c2; |
| |
| if (p1 == p2) |
| return 0; |
| |
| do |
| { |
| c1 = c_tolower (*p1); |
| c2 = c_tolower (*p2); |
| |
| if (c1 == '\0') |
| break; |
| |
| ++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 _GL_CMP (c1, c2); |
| } |