12a6b7db3Sskrll /* strncmp -- compare two strings, stop after n bytes. 22a6b7db3Sskrll This function is in the public domain. */ 32a6b7db3Sskrll 42a6b7db3Sskrll /* 52a6b7db3Sskrll 6*05caefcfSchristos @deftypefn Supplemental int strncmp (const char *@var{s1}, @ 7*05caefcfSchristos const char *@var{s2}, size_t @var{n}) 82a6b7db3Sskrll 92a6b7db3Sskrll Compares the first @var{n} bytes of two strings, returning a value as 102a6b7db3Sskrll @code{strcmp}. 112a6b7db3Sskrll 122a6b7db3Sskrll @end deftypefn 132a6b7db3Sskrll 142a6b7db3Sskrll */ 152a6b7db3Sskrll 162a6b7db3Sskrll #include <ansidecl.h> 172a6b7db3Sskrll #include <stddef.h> 182a6b7db3Sskrll 192a6b7db3Sskrll int strncmp(const char * s1,const char * s2,register size_t n)202a6b7db3Sskrllstrncmp(const char *s1, const char *s2, register size_t n) 212a6b7db3Sskrll { 222a6b7db3Sskrll register unsigned char u1, u2; 232a6b7db3Sskrll 242a6b7db3Sskrll while (n-- > 0) 252a6b7db3Sskrll { 262a6b7db3Sskrll u1 = (unsigned char) *s1++; 272a6b7db3Sskrll u2 = (unsigned char) *s2++; 282a6b7db3Sskrll if (u1 != u2) 292a6b7db3Sskrll return u1 - u2; 302a6b7db3Sskrll if (u1 == '\0') 312a6b7db3Sskrll return 0; 322a6b7db3Sskrll } 332a6b7db3Sskrll return 0; 342a6b7db3Sskrll } 35