diff options
author | Bruno Haible <bruno@clisp.org> | 2005-10-11 18:48:53 +0000 |
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committer | Bruno Haible <bruno@clisp.org> | 2005-10-11 18:48:53 +0000 |
commit | 89e15da69a6c83aef9b0f324286465af40560ad9 (patch) | |
tree | 86031c1df8959cc19bd2e8222d014b089e27425f /lib/c-strncasecmp.c | |
parent | 40f65b91c5345554bb75aa45a543da3488c612b3 (diff) | |
download | gnulib-89e15da69a6c83aef9b0f324286465af40560ad9.tar.gz |
New module 'c-strcase'.
Diffstat (limited to 'lib/c-strncasecmp.c')
-rw-r--r-- | lib/c-strncasecmp.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/lib/c-strncasecmp.c b/lib/c-strncasecmp.c new file mode 100644 index 0000000000..2d260efb67 --- /dev/null +++ b/lib/c-strncasecmp.c @@ -0,0 +1,59 @@ +/* c-strncasecmp.c -- case insensitive string comparator in C locale + Copyright (C) 1998, 1999, 2005 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 + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + 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 + +/* Specification. */ +#include "c-strcase.h" + +#include <limits.h> + +#include "c-ctype.h" + +int +c_strncasecmp (const char *s1, const char *s2, size_t n) +{ + 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 || n == 0) + return 0; + + do + { + c1 = c_tolower (*p1); + c2 = c_tolower (*p2); + + if (--n == 0 || 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 (c1 > c2 ? 1 : c1 < c2 ? -1 : 0); +} |