libc/string/strcmp.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <string.h>
  21
  22 /**
  23  * strcmp - Compare two strings
  24  * @cs: One string
  25  * @ct: Another string
  26  */
  27 int strcmp (const char *cs, const char *ct)
  28 {
  29         signed char res;
  30
  31         while (1) {
  32                 if ((res = *cs - *ct++) || !*cs ++)
  33                         break;
  34         }
  35
  36         return res;
  37 }
  38
  39 /**
  40  * strncmp - Compare two length-limited strings
  41  * @cs: One string
  42  * @ct: Another string
  43  * @count: The maximum number of bytes to compare
  44  */
  45 int strncmp (const char *cs, const char *ct, size_t count)
  46 {
  47         signed char res = 0;
  48
  49         while (count) {
  50                 if ((res = *cs - *ct ++) || !*cs ++)
  51                         break;
  52
  53                 count --;
  54         }
  55
  56         return res;
  57 }