diff options
Diffstat (limited to 'libc-top-half/musl/src/string/strchrnul.c')
-rw-r--r-- | libc-top-half/musl/src/string/strchrnul.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/string/strchrnul.c b/libc-top-half/musl/src/string/strchrnul.c new file mode 100644 index 0000000..39e2635 --- /dev/null +++ b/libc-top-half/musl/src/string/strchrnul.c @@ -0,0 +1,28 @@ +#include <string.h> +#include <stdint.h> +#include <limits.h> + +#define ALIGN (sizeof(size_t)) +#define ONES ((size_t)-1/UCHAR_MAX) +#define HIGHS (ONES * (UCHAR_MAX/2+1)) +#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) + +char *__strchrnul(const char *s, int c) +{ + c = (unsigned char)c; + if (!c) return (char *)s + strlen(s); + +#ifdef __GNUC__ + typedef size_t __attribute__((__may_alias__)) word; + const word *w; + for (; (uintptr_t)s % ALIGN; s++) + if (!*s || *(unsigned char *)s == c) return (char *)s; + size_t k = ONES * c; + for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++); + s = (void *)w; +#endif + for (; *s && *(unsigned char *)s != c; s++); + return (char *)s; +} + +weak_alias(__strchrnul, strchrnul); |