39 lines
702 B
C
39 lines
702 B
C
/* 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>
|
|
#ifdef __STDC__
|
|
#include <stddef.h>
|
|
#else
|
|
#define size_t unsigned long
|
|
#endif
|
|
|
|
int
|
|
strncmp(s1, s2, n)
|
|
const char *s1, *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;
|
|
}
|