lib/stdlibc/strings.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <strings.h>
  20 #include <stddef.h>
  21
  22 int strcasecmp(const char *str1,const char *str2) {
  23   size_t i;
  24   for (i=0;(str1[i]!=0 && str2[i]!=0);i++) {
  25     if (str1[i]!=str2[i]) return str1[i]-str2[i];
  26   }
  27   return 0;
  28 }
  29
  30 int strncasecmp(const char *str1,const char *str2,size_t n) {
  31   size_t i;
  32   for (i=0;(str1[i]!=0 && str2[i]!=0 && i<n);i++) {
  33     if (str1[i]!=str2[i]) return str1[i]-str2[i];
  34   }
  35   return 0;
  36 }
  37
  38 int ffs(int x) {
  39   size_t i;
  40   for (i=0;i<sizeof(int)*8;i++) {
  41     if (x&(1<<i)) return i+1;
  42   }
  43   return 0;
  44 }