where standard library functions?

[J Wang]

use

ar t /usr/lib/libc.a

get many *.o(obj files) of the function in standard library.

could I get the code of them?

cheers

 

[Malcolm]

get many *.o(obj files) of the function in standard library.

could I get the code of them?

The source may or may not ship. If it is freely available, it will probably
be very difficult to read.
For portable source to to C standard library, get Plauger's book "The
Standard C library".