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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;
- }
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