Where to find the stdio.h implementation?

Question

Possible duplicate:
Where to find implementations of stdio.h functions?

Hi, I am trying to find function definitions for functions defined in the stdio.h header file, I want to know how functions like printf () are executed, but I cannot find a link to the preprocessor directors in stdio. h to the implementation file elsewhere. How does the C compiler know where to find implementations when there are no direct links to the function definition file? (I found out that the .h file may be accompanied by the same name .c implementation file from the objective-c book.) Could you help me? Thank you I use GCC on Mac OS X.

Answer 1

FreeBSD libc is pretty well laid out in the src repository.

http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc/

eg. for printf(3) :

http://svnweb.freebsd.org/base/head/lib/libc/stdio/printf.c?view=markup

http://svnweb.freebsd.org/base/head/lib/libc/stdio/vfprintf.c?view=markup

Answer 2

Try downloading the source code for the GLIBC library project . What the definitions for standard functions are when using the GCC compiler (and derivatives).