lib/c-strncasecmp.c

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This source file includes following definitions.
c_strncasecmp
     1 /* c-strncasecmp.c -- case insensitive string comparator in C locale
     2    Copyright (C) 1998-1999, 2005-2006, 2009-2023 Free Software Foundation, Inc.
     3 
     4    This file is free software: you can redistribute it and/or modify
     5    it under the terms of the GNU Lesser General Public License as
     6    published by the Free Software Foundation; either version 2.1 of the
     7    License, or (at your option) any later version.
     8 
     9    This file is distributed in the hope that it will be useful,
    10    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12    GNU Lesser General Public License for more details.
    13 
    14    You should have received a copy of the GNU Lesser General Public License
    15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
    16 
    17 #include <config.h>
    18 
    19 /* Specification.  */
    20 #include "c-strcase.h"
    21 
    22 #include <limits.h>
    23 
    24 #include "c-ctype.h"
    25 
    26 int
    27 c_strncasecmp (const char *s1, const char *s2, size_t n)
    28 {
    29   register const unsigned char *p1 = (const unsigned char *) s1;
    30   register const unsigned char *p2 = (const unsigned char *) s2;
    31   unsigned char c1, c2;
    32 
    33   if (p1 == p2 || n == 0)
    34     return 0;
    35 
    36   do
    37     {
    38       c1 = c_tolower (*p1);
    39       c2 = c_tolower (*p2);
    40 
    41       if (--n == 0 || c1 == '\0')
    42         break;
    43 
    44       ++p1;
    45       ++p2;
    46     }
    47   while (c1 == c2);
    48 
    49   if (UCHAR_MAX <= INT_MAX)
    50     return c1 - c2;
    51   else
    52     /* On machines where 'char' and 'int' are types of the same size, the
    53        difference of two 'unsigned char' values - including the sign bit -
    54        doesn't fit in an 'int'.  */
    55     return _GL_CMP (c1, c2);
    56 }
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root/lib/c-strncasecmp.c

DEFINITIONS
