__pure
unsigned long ___runetype(__ct_rune_t) __pure;
__ct_rune_t ___tolower(__ct_rune_t) __pure;
__ct_rune_t ___toupper(__ct_rune_t) __pure;
int strncmp(const char *, const char *, size_t) __pure;
size_t strnlen(const char *, size_t) __pure;
char *strnstr(const char *, const char *, size_t) __pure;
char *strpbrk(const char *, const char *) __pure;
char *strrchr(const char *, int) __pure;
size_t strspn(const char *, const char *) __pure;
char *strstr(const char *, const char *) __pure;
void *memchr(const void *, int, size_t) __pure;
void *memrchr(const void *, int, size_t) __pure;
int memcmp(const void *, const void *, size_t) __pure;
void *memmem(const void *, size_t, const void *, size_t) __pure;
char *strcasestr(const char *, const char *) __pure;
char *strchr(const char *, int) __pure;
char *strchrnul(const char*, int) __pure;
int strcmp(const char *, const char *) __pure;
size_t strcspn(const char *, const char *) __pure;
size_t strlen(const char *) __pure;
int bcmp(const void *, const void *, size_t) __pure; /* LEGACY */
char *index(const char *, int) __pure; /* LEGACY */
char *rindex(const char *, int) __pure; /* LEGACY */
int strcasecmp(const char *, const char *) __pure;
int strncasecmp(const char *, const char *, size_t) __pure;
unsigned long ___runetype_l(__ct_rune_t, locale_t) __pure;
__ct_rune_t ___tolower_l(__ct_rune_t, locale_t) __pure;
__ct_rune_t ___toupper_l(__ct_rune_t, locale_t) __pure;
#define __pure __attribute__((__pure__))
#define __pure