null_stream.h

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#pragma once
 
#include <derive-c/core/prelude.h>
 
#include <stdio.h>
#include <sys/types.h>
 
#if !defined _GNU_SOURCE
    #error "gnu source  must be defined (is in the src/derive-c CMakeLists.txt) to use cookie io"
#endif
 
DC_PUBLIC static FILE* dc_null_stream(void) {
    cookie_io_functions_t io = {
        .read = NULL,
        .write = NULL,
        .seek = NULL,
        .close = NULL,
    };
 
    FILE* f = fopencookie(NULL, "w", io);
    DC_ASSERT(f, "received nullptr from fopencookie");
 
    // Set io as unbuffered
    DC_ASSERT(setvbuf(f, NULL, _IONBF, 0) == 0, "setvbuf failed");
 
    return f;
}