Message from discussion __FUNCTION__ ????

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From: sob...@eudoramail.com (Sobhan Vezzu)
Newsgroups: comp.lang.c
Subject: __FUNCTION__ ????
Date: 19 Oct 2001 03:55:05 -0700
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Hello All,

         I understood that __FUNCTION__ is a preprocessor macro, which
will substitute a file name. Similar to __FILE__ and __LINE__.

         1) I have written a small code, only for __FUNCTION__ it
prints as unknown why? What is the difference between __FILE__ and
__FUNCTION__. When I comment #ifndef __FUNCTION block it prints the
file name.
         2) Where do I get a list of all the preprocessor macros.
         
#include <stdio.h>
#include <errno.h>

#ifndef __LINE__
#define __LINE__ 0
#endif

#ifndef __FILE__
#define __FILE__ "Unknown"
#endif


#ifndef __FUNCTION__
#define __FUNCTION__ "Unknown"
#endif

int assert(int bool, int line, char *file, char *fun)
{
	char mesg[100];
	sprintf(mesg, "line: %d, file: %s, function: %s\nError ", line, file,
fun);
	if(bool){
		perror(mesg);
		errno = 0;
	}
	return 1;
}
int main()
{
	char info[50];
	FILE *fp;

	errno = 0;
	fp = fopen("ex.dat", "r");
	assert(fp == NULL, __LINE__ - 1, __FILE__, __FUNCTION__);

	fp = fopen("t.c", "r");
	assert(errno != 0, __LINE__, __FILE__, __FUNCTION__);
	return 1;
}	

bye,
Sobhan