C library source code [closed]

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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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OTOH, in addition to glibc:

• uclibc
• dietlibc
• BSD libc

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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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The GNU version is here:

Info: http://www.gnu.org/software/libc/

Download: http://ftp.gnu.org/gnu/glibc/

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You may need to narrow down your question a bit. The implementation varies. Not everything related to implementation details (perhaps pretty much all of it - someone with more standard knowledge can chip in) is prescribed by the C/C++ standard.

In the end you may understand how a particular library decided to do it. It's still useful knowledge, but not THE answer.

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The simplest and cleanest standard C library I've ever seen is Minix's standard library.

I ported it on at least 3 toolchains with virtually no effort.

I actually grew up with that library.

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I couldn't find the printf function's source code

Here is the source code for this function, it seems to be calling to __vbprintf_internal, which is found glibc/stdio-common/vfprintf-internal.c. Glibc source code is also available in bootlin, I think it is more readable and convenient code.

int __printf (const char *format, ...)
{
  va_list arg;
  int done;
  va_start (arg, format);
  done = __vfprintf_internal (stdout, format, arg, 0);
  va_end (arg);
  return done;
}

glibc/stdio-common/printf.c