/* Copyright (C) 2024 Aiden Gall

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 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>. */

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

void warn(const char *fmt, ...);
void die(const char *fmt, ...);

void efwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);

long argtonum(const char *arg, long minval, long maxval);

void
warn(const char *const fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
}

void
die(const char *const fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);

	exit(EXIT_FAILURE);
}

void
efwrite(const void *const ptr, const size_t size, const size_t nmemb,
        FILE *const stream)
{
	if (fwrite(ptr, size, nmemb, stream) != nmemb)
		die("fwrite: Write failed\n");
}

long
argtonum(const char *const arg, const long minval, const long maxval)
{
	long ret;
	char *endptr;

	if (minval > maxval)
		die("argtonum: Invalid range\n");
	if (!arg)
		die("argtonum: Missing argument\n");

	errno = 0;
	ret = strtol(arg, &endptr, 10);
	if (errno)
		die("strtol: %s\n", strerror(errno));
	if (arg == endptr || *endptr)
		die("strtol: Invalid integer\n");

	if (ret < minval || ret > maxval)
		die("argtonum: Argument out of range\n");

	return ret;
}