Effect undefined for input stream . Returns EOF for write error, zero otherwise. Returns EOF on error, zero otherwise. Returns non-zero on failure. Returns non-zero on failure.
Returns stream or NULL on failure.
If buf is non-NULL then setvbuf will assign it as the buffer for stream otherwise setvbuf will allocate one and the value at size will determine the size of the buffer. Returns zero on success or nonzero on error. Controls buffering for stream stream . See also setvbuf . The first string specifies minimum field width, and the second string specifies the maximum number of chars to be printed from the string.