Library

When i look up at the functions which are defined in stdlib.h, they only show something like this

Code:

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#ifndef __CYGWIN__
_PTR        _EXFUN(_malloc_r,(struct _reent *, size_t));
_PTR        _EXFUN(_calloc_r,(struct _reent *, size_t, size_t));
_VOID        _EXFUN(_free_r,(struct _reent *, _PTR));
_PTR        _EXFUN(_realloc_r,(struct _reent *, _PTR, size_t));
_VOID        _EXFUN(_mstats_r,(struct _reent *, char *));
#endif
int        _EXFUN(_system_r,(struct _reent *, const char *));

_VOID        _EXFUN(__eprintf,(const char *, const char *, unsigned int, const char *));

_END_STD_C

#endif /* _STDLIB_H_ */

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Let say if i want to view the code of the strcmp() function, where can i find it?

Depends on if you've got an open source library. If so, then the library documentation will tell you. If you're looking for say Microsoft's version, you're not going to find it.

That's right - the header files only contain the information necessary to check that your code uses the function prototypes correctly. Header files in turn are linked to code, which in the case of standard C, is almost always a precompiled library. Most Linux systems use glibc, and you can download the source code at Index of /gnu/glibc. As for windows systems, I'm not sure what the library is called or if you can even get a copy of it. There are other alternatives out there used by some systems. In any case - the implementations won't differ THAT much. They have different optimizations, etc... but if you just want to see how an operation can be done, glibc is a decent example.

Thanks. And what does MSDN do and have? I mean the library.
Take this as an example

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About EAP (Windows)

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Microsoft is usually pretty good about giving lots of details to developers. You'll find plenty of good references through MSDN, and they should give you any relevant implementation details. But they're closed-source, and you probably won't find any source code there, other than examples.

Quote:

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Originally Posted by valthyx

Thanks. And what does MSDN do and have? I mean the library.
Take this as an example

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Chances are that if it comes from Microsoft, the source code is not available.

Quote:

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Originally Posted by tabstop

Depends on if you've got an open source library. If so, then the library documentation will tell you. If you're looking for say Microsoft's version, you're not going to find it.

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Of course you are. Microsoft provides the full source code of its C and C++ libraries. They reside on the hard drive under the Visual Studio directory somewhere. Don't know where exactly.
You can also step into those functions to see the source.