libc/string/strncmp.c

   1 /*
   2  * Copyright (C) 2002     Manuel Novoa III
   3  * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
   4  *
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 #include "_string.h"
   9
  10 #ifdef WANT_WIDE
  11 # define Wstrncmp wcsncmp
  12 #else
  13 # define Wstrncmp strncmp
  14 #endif
  15
  16 int Wstrncmp(register const Wchar *s1, register const Wchar *s2, size_t n)
  17 {
  18 #ifdef WANT_WIDE
  19         while (n && (*((Wuchar *)s1) == *((Wuchar *)s2))) {
  20                 if (!*s1++) {
  21                         return 0;
  22                 }
  23                 ++s2;
  24                 --n;
  25         }
  26
  27         return (n == 0) ? 0 : (*((Wuchar *)s1) - *((Wuchar *)s2));
  28 #else
  29         int r = 0;
  30
  31         while (n--
  32                    && ((r = ((int)(*((unsigned char *)s1))) - *((unsigned char *)s2++))
  33                         == 0)
  34                    && *s1++);
  35
  36         return r;
  37 #endif
  38 }
  39 #ifndef WANT_WIDE
  40 libc_hidden_weak(strncmp)
  41 #endif