/*
 * run.c - Run helper scripts
 *
 * 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.
 */

#define _GNU_SOURCE /* for vasprintf */
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>

#include "run.h"


void run_cmd(const char *fmt, ...)
{
	va_list ap;
	char *tmp;
	int res;

	va_start(ap, fmt);
	if (vasprintf(&tmp, fmt, ap) < 0) {
		perror("vasprintf");
		exit(1);
	}
	res = system(tmp);
	if (res < 0) {
		perror("system");
		exit(1);
	}
	if (res) {
		fprintf(stderr, "\"%s\" returned %d\n", tmp, res);
		exit(1);
	}
}


void cat(FILE *out, const char *name)
{
	FILE *in;
	char buf[10000]; /* pick any good size */
	size_t got, wrote;

	in = fopen(name, "r");
	if (!in) {
		perror(name);
		exit(1);
	}
	while (1) {
		got = fread(buf, 1, sizeof(buf), in);
		if (!got)
			break;
		wrote = fwrite(buf, 1, got, out);
		if (wrote != got) {
			perror("fwrite");
			exit(1);
		}
	}
	if (ferror(in)) {
		perror(name);
		exit(1);
	}
	fclose(in);
}