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Commit | Line | Data |
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b3524c8f | 1 | /* strncmp -- compare two strings, stop after n bytes. |
2 | This function is in the public domain. */ | |
3 | ||
614a23c6 | 4 | /* |
5 | ||
bac427a1 | 6 | @deftypefn Supplemental int strncmp (const char *@var{s1}, @ |
7 | const char *@var{s2}, size_t @var{n}) | |
614a23c6 | 8 | |
9 | Compares the first @var{n} bytes of two strings, returning a value as | |
10 | @code{strcmp}. | |
11 | ||
12 | @end deftypefn | |
13 | ||
14 | */ | |
15 | ||
b3524c8f | 16 | #include <ansidecl.h> |
b3524c8f | 17 | #include <stddef.h> |
b3524c8f | 18 | |
19 | int | |
cd72df1f | 20 | strncmp(const char *s1, const char *s2, register size_t n) |
b3524c8f | 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 | } |