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/* strncmp -- compare two strings, stop after n bytes.

   This function is in the public domain.  */

/*

@deftypefn Supplemental int strncmp (const char *@var{s1}, @

  const char *@var{s2}, size_t @var{n})

Compares the first @var{n} bytes of two strings, returning a value as

@code{strcmp}.

@end deftypefn

*/

#include <ansidecl.h>

#include <stddef.h>

int

strncmp(const char *s1, const char *s2, register size_t n)

{

  register unsigned char u1, u2;

  while (n-- > 0)

    {

      u1 = (unsigned char) *s1++;

      u2 = (unsigned char) *s2++;

      if (u1 != u2)

        return u1 - u2;

      if (u1 == '\0')

        return 0;

    }

  return 0;

}