zig/libc/mingw/misc/strnlen.c

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#define __CRT__NO_INLINE
#include <string.h>
size_t __cdecl strnlen (const char *s, size_t maxlen)
{
const char *s2 = s;
while ((size_t) (s2 - s) < maxlen && *s2)
++s2;
return s2 - s;
}