File operations in C

http://www.google.ru/search?q=funct...d+in+C&lr=&aq=f

The fourth link, on cprogrammin.com
or fwrite article on wikipedia (20-something-th link )
ps - there is no such function to insert some bytes in the middle and automatically push the rest of the file forward.

fwrite()
fread()
fopen()
fclose()
fseek()
getc()
putc()
fscanf
fprintf

are some ones you should check into. And then there's the ones included in the original language, but not ANSI.

Also check out Open Group's website for info on functions, such as:

http://www.opengroup.org/onlinepubs...fs/stdio.h.html