with macro in c

with_macro.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#define with(_init, _fini) for(int _count = ((_init), 1); _count--; (_fini))
#define with_file(var, name, access) with(var = fopen(name, access), (var ? fclose(var) : 0 ))

void
test_macro(char *file)
{
    FILE *fp;

    with_file(fp, file, "rb") {
        if(!fp)
            printf("Error opening %s: %s\n", file, strerror(errno));
        else
            printf("Opened file %s\n", file);
    }
}