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babon
babon

Reputation: 3774

Regarding stdio.h

Confession: I am a novice.

Question: I was checking out stdio.h, but I could not find the definition of the fopen function. Can somebody please tell where can I find the definition?

regards,

bug.

Upvotes: 4

Views: 397

Answers (8)

Stephen Canon
Stephen Canon

Reputation: 106197

The implementation of fopen( ) for OS X (which is what the questioner is asking about) is available on opensource.apple.com:

http://opensource.apple.com/source/Libc/Libc-498.1.7/stdio/fopen-fbsd.c

I am curious, however, as to why you're looking for it; part of the point of libraries is that you don't need to know the details of how they work in order to use them effectively -- you need only know how to link against them and what the functions are defined to do.

Upvotes: 0

Sasha Kostic
Sasha Kostic

Reputation: 46

http://ftp.gnu.org/gnu/glibc/ There you can find c std. library source code

Upvotes: 2

komiga
komiga

Reputation: 393

You can find the definitions of functions in stdio.h here: http://en.wikipedia.org/wiki/Stdio.h

And here's an article on C file io: http://en.wikipedia.org/wiki/C_file_input/output

Upvotes: 3

erikbstack
erikbstack

Reputation: 13254

I found sourcecode here. am not a C-Coder so check the result for yourself. As far as I can tell, it looks like a real implementation. But even if it is not the "true" implementation it can at least give some hinds for the learning eyes. So it should be helpful, to know this file.

Upvotes: 0

stijn
stijn

Reputation: 35901

the declaration should be in stdio.h (afaik the standard requires this), but it's not likely you're going to find the definition there*. If you are using an open source os, it probably has packages containing source code (containing the definition) you can download. Else, sorry, no definition available.

*supposing the author considers definition to mean the actual implementation whereas declaration rather refers to function prototype

Upvotes: 4

w3b_wizzard
w3b_wizzard

Reputation: 147

alternatively, you can go on http://cplusplus.com/ under reference -> C Library -> cstdio (stdio.h)

Upvotes: 0

Vivien Barousse
Vivien Barousse

Reputation: 20875

extern FILE *fopen (__const char *__restrict __filename,
                    __const char *__restrict __modes) __wur;

As you said, in stdio.h.

Upvotes: 2

Nathan Fellman
Nathan Fellman

Reputation: 127468

If you're using unix or linux you can find it with:

man fopen

Otherwise, just google for man fopen and you'll find it.

You can use man for pretty much any standard library function.

Upvotes: 3

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