lib/ansi/strncmp.c

   1 /*
   2  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
   3  * See the copyright notice in the ACK home directory, in the file "Copyright".
   4  */
   5 /* $Id$ */
   6
   7 #include        <string.h>
   8
   9 int
  10 strncmp(register const char *s1, register const char *s2, register size_t n)
  11 {
  12         if (n) {
  13                 do {
  14                         if (*s1 != *s2++)
  15                                 break;
  16                         if (*s1++ == '\0')
  17                                 return 0;
  18                 } while (--n > 0);
  19                 if (n > 0) {
  20                         if (*s1 == '\0') return -1;
  21                         if (*--s2 == '\0') return 1;
  22                         return (unsigned char) *s1 - (unsigned char) *s2;
  23                 }
  24         }
  25         return 0;
  26 }