Merge libiberty from gcc
[deliverable/binutils-gdb.git] / libiberty / strncmp.c
... / ...
CommitLineData
1/* strncmp -- compare two strings, stop after n bytes.
2 This function is in the public domain. */
3
4/*
5
6@deftypefn Supplemental int strncmp (const char *@var{s1}, @
7 const char *@var{s2}, size_t @var{n})
8
9Compares the first @var{n} bytes of two strings, returning a value as
10@code{strcmp}.
11
12@end deftypefn
13
14*/
15
16#include <ansidecl.h>
17#include <stddef.h>
18
19int
20strncmp(const char *s1, const char *s2, register size_t n)
21{
22 register unsigned char u1, u2;
23
24 while (n-- > 0)
25 {
26 u1 = (unsigned char) *s1++;
27 u2 = (unsigned char) *s2++;
28 if (u1 != u2)
29 return u1 - u2;
30 if (u1 == '\0')
31 return 0;
32 }
33 return 0;
34}
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