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Where to find stdio.h functions implementations ?
Hi, I am trying to find the function definitions of the functions defined in stdio.h header file, I want to learn how functions like printf() is achieved, but I can't find any preprocessor directives link in stdio.h to the implementation file elsewhere. How can a C Compiler know where to find the implementations when there are no direct references to the function definition file? (I learned that .h file may accompany with a same name .c implementation file from an objective-c book.) Could you help me? Thanks! I am using GCC on Mac OS X.
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In Ubuntu, which your original question indicated you're using, the “root” stdio. h file is in /usr/include .
#include<stdio. h> means, during compilation preprocessor will search the stdio header file only in predefined path(/user/include/). whereas #include"stdio. h" preprocessor first search in present working directory, if stdio header file is not present there, it will search in the predefined path.
The File Stdio. h is included in the path C:\Program Files (x86)\Windows Kits\10\Include\10.0. 17134.0\ucrt.
FreeBSD's libc is pretty well laid out in its src repository.
http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc/
e.g. 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
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Try downloading source code for GLIBC library project. That's where definitions for standard functions are when using GCC compiler (and derivates).
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