UNIX Network Programming Reading Notes: byte manipulation functions

# Include <strings. h> bzero (* bcopy (* src, * bcmp (* ptr1, *-equal, non-0-not equal

Bzero sets the number of bytes in the target to 0;

Bcopy moves the specified number of bytes from the source to the target;

Bcmp compares any two byte strings. If the values are the same, the return value is 0. Otherwise, the return value is non-0.

# Include <. h> * memset (* dest, * memcpy (* dest, * memcmp (* ptr1, *-Same,> 0 or <-different

Memset sets the specified number of bytes to the value c;

Memcpy is similar to bcopy, But it exchanges the order of two pointer parameters. When the source and target overlap, bcopy can be correctly processed, and the memcpy operation result is unknown. In this case, the memmove function of ansi c must be used.

Memcmp compares any two byte strings. If the values are the same, 0 is returned. If the values are different, a non-0 value is returned. Whether it is greater than 0 or less than 0 depends on the first byte: if ptr1 is greater than ptr2, it is greater than 0; otherwise, it is less than 0. during the comparison operation, it is assumed that the two unequal bytes are unsigned characters (unsigned char ).