Branch data     Line data    Source code

       1                 :            : /* c-strncasecmp.c -- case insensitive string comparator in C locale
       2                 :            :    Copyright (C) 1998-1999, 2005-2006, 2009-2012 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 Lesser General Public License as published by
       6                 :            :    the Free Software Foundation; either version 2.1, 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 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 <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                 :         54 : c_strncasecmp (const char *s1, const char *s2, size_t n)
      28                 :            : {
      29                 :         54 :   register const unsigned char *p1 = (const unsigned char *) s1;
      30                 :         54 :   register const unsigned char *p2 = (const unsigned char *) s2;
      31                 :            :   unsigned char c1, c2;
      32                 :            : 
      33 [ +  - ][ -  + ]:         54 :   if (p1 == p2 || n == 0)
      34                 :          0 :     return 0;
      35                 :            : 
      36                 :            :   do
      37                 :            :     {
      38                 :        242 :       c1 = c_tolower (*p1);
      39                 :        242 :       c2 = c_tolower (*p2);
      40                 :            : 
      41 [ +  + ][ +  + ]:        242 :       if (--n == 0 || c1 == '\0')
      42                 :            :         break;
      43                 :            : 
      44                 :        200 :       ++p1;
      45                 :        200 :       ++p2;
      46                 :            :     }
      47         [ +  + ]:        200 :   while (c1 == c2);
      48                 :            : 
      49                 :            :   if (UCHAR_MAX <= INT_MAX)
      50                 :         54 :     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                 :            : }