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Member "cpio-2.13/gnu/c-strncasecmp.c" (2 Jan 2017, 1606 Bytes) of package /linux/misc/cpio-2.13.tar.bz2:


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    1 /* c-strncasecmp.c -- case insensitive string comparator in C locale
    2    Copyright (C) 1998-1999, 2005-2006, 2009-2017 Free Software Foundation, Inc.
    3 
    4    This program is free software; you can redistribute it and/or modify
    5    it under the terms of the GNU General Public License as published by
    6    the Free Software Foundation; either version 3, or (at your option)
    7    any later version.
    8 
    9    This program 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 General Public License for more details.
   13 
   14    You should have received a copy of the GNU General Public License
   15    along with this program; if not, see <http://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 (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
   56 }