/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/statvfs.h>

#include "../util.h"

const char *
disk_free(const char *mnt)
{
	struct statvfs fs;

	if (statvfs(mnt, &fs) < 0) {
		fprintf(stderr, "statvfs '%s': %s\n", mnt, strerror(errno));
		return NULL;
	}

	return bprintf("%f",
	               (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
}

const char *
disk_perc(const char *mnt)
{
	struct statvfs fs;

	if (statvfs(mnt, &fs) < 0) {
		fprintf(stderr, "statvfs '%s': %s\n", mnt, strerror(errno));
		return NULL;
	}

	return bprintf("%d", 100 *
				   (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks)));
}

const char *
disk_total(const char *mnt)
{
	struct statvfs fs;

	if (statvfs(mnt, &fs) < 0) {
		fprintf(stderr, "statvfs '%s': %s\n", mnt, strerror(errno));
		return NULL;
	}

	return bprintf("%f",
	               (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
}

const char *
disk_used(const char *mnt)
{
	struct statvfs fs;

	if (statvfs(mnt, &fs) < 0) {
		fprintf(stderr, "statvfs '%s': %s\n", mnt, strerror(errno));
		return NULL;
	}

	return bprintf("%f",
	               (float)fs.f_bsize * ((float)fs.f_blocks -
	               (float)fs.f_bfree) / 1024 / 1024 / 1024);
}