strings.h

bcmp (const void *s1, const void *s2, size_t n)

int 

Compares byte sequences.

bcopy (const void *src, void *dest, size_t n)

void 

Copies byte sequences.

bzero (void *s, size_t n)

void 

Sets byte sequences to zero.

index (const char *s, int c)

char * 

Searches for the first position of the matched character in a string.

rindex (const char *s, int c)

char * 

Searches for the last position of the matched character in a string.

ffs (int i)

int 

Searches for the first bit in a word of the integer type.

ffsl (long int i)

int 

Searches for the first bit in a word of the long integer type.

ffsll (long long int i)

int 

Searches for the first bit in a word of the 8-byte long integer type.

strcasecmp (const char *_l, const char *_r)

int 

Compares two strings (string 1 and string 2), regardless of the letter case.

strncasecmp (const char *_l, const char *_r, size_t n)

int 

Compares a specified length of two strings (string 1 and string 2), regardless of the letter case.