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I want to find the C libraries' source code to find out more about the functions used.Is GCC the only resource I can count on?I couldn't use the doxygen html version of the GCC libraries,to tell the truth it seems complex to me,for example I couldn't find the printf function's source code(Was I looking in the wrong place?). Thanks in advance.
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The C language is not a piece of software but a defined standard, so one wouldn't say that it's open-source, but rather that it's an open standard. There are a gazillion different compilers for C however, and many of those are indeed open-source.
You need to get the source code of the associated C library, probably glibc or eglibc in your case. In the /usr/include/ folder, only the headers of the libc are present, along with some linux kernel headers in the linux/ subfolder.
The C standard library itself is stored in '/usr/lib/libc.
The C standard library provides macros, type definitions and functions for tasks such as string handling, mathematical computations, input/output processing, memory management, and several other operating system services.
OTOH, in addition to glibc:
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Reading the source code is one thing. Reading a good book that includes source code is another thing entirely. And I'm not sure you can do better than The Standard C Library, by PJ Plauger. It's 20 years old, but for me it's still a page-turner.
Man, I feel old.
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