fread, fwrite - buffered binary input/output
fread(ptr, sizeof(*ptr), nitems, stream)
fwrite(ptr, sizeof(*ptr), nitems, stream)
Fread reads, into a block beginning at ptr, nitems of data of the type
of *ptr from the named input stream. It returns the number of items
If stream is stdin and the standard output is line buffered, then any
partial output line will be flushed before any call to read(2) to sat-
isfy the fread.
Fwrite appends at most nitems of data of the type of *ptr beginning at
ptr to the named output stream. It returns the number of items actu-
read(2), write(2), fopen(3S), getc(3S), putc(3S), gets(3S), puts(3S),
Fread and fwrite return 0 upon end of file or error.
4th Berkeley Distribution 19 January 1983 FREAD(3S)