CODEWITHSUNDEEP
c++
Rick
Rick

Reputation: 7516

Where can I find EOF definition in stdio.h of llvm?

I am digging around C++ I/O documentation.

I can find EOF definition in stdio.h of VC++ but can't find it in stdio.h of llvm https://github.com/llvm-mirror/libcxx/blob/master/include/stdio.h

enter image description here

By the way, from https://en.cppreference.com/w/cpp/string/char_traits it says enter image description here

So for char, std::char_traits::eof returns EOF which is -1. Also from https://en.cppreference.com/w/cpp/string/char_traits/eof, it says :

Returns a value not equivalent to any valid value of type char_type.

So here's what I deduce: -1 is not a valid value of type char_type(char)?

How come? In VC++, char is signed, so -1 should be valid for char.

Upvotes: 0

Views: 685

Answers (1)

Cubbi
Cubbi

Reputation: 47468

The file you mention, https://github.com/llvm-mirror/libcxx/blob/master/include/stdio.h , picks up EOF from the C library using this line:

#include_next <stdio.h>

LLVM does not provide a C library, so it will be whatever you have on your system. For example, on a Linux, it will typically be GNU libc, which defines EOF here

/* The value returned by fgetc and similar functions to indicate the
   end of the file.  */
#define EOF (-1)

Upvotes: 1

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