eda-tools/b2/boom.c

/*
 * boom.c - BOOM, main function
 *
 * Copyright 2012 by Werner Almesberger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */


#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>


extern int yyparse(void);


static void usage(const char *name)
{
	fprintf(stderr, "usage: %s [file]\n", name);
	exit(1);
}


int main(int argc, char **argv)
{
	int fd;

	switch (argc) {
	case 1:
		break;
	case 2:
		fd = open(argv[1], O_RDONLY);
		if (fd < 0) {
			perror(argv[1]);
			exit(1);
		}
		if (dup2(fd, 0) < 0) {
			perror("dup2");
			exit(1);
		}
		break;
	default:
		usage(*argv);
	}
	(void) yyparse();
	return 0;
}