libiberty/strncmp.c

   1 /* strncmp -- compare two strings, stop after n bytes.
   2    This function is in the public domain.  */
   3
   4 #include <ansidecl.h>
   5 #ifdef __STDC__
   6 #include <stddef.h>
   7 #else
   8 #define size_t unsigned long
   9 #endif
  10
  11 int
  12 strncmp(s1, s2, n)
  13      const char *s1, *s2;
  14      register size_t n;
  15 {
  16   register unsigned char u1, u2;
  17
  18   while (n-- > 0)
  19     {
  20       u1 = (unsigned char) *s1++;
  21       u2 = (unsigned char) *s2++;
  22       if (u1 != u2)
  23         return u1 - u2;
  24       if (u1 == '\0')
  25         return 0;
  26     }
  27   return 0;
  28 }