source: mainline/uspace/app/df/df.c@ 8ffedd8

/*
 * Copyright (c) 2013 Manuele Conti
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup df
 * @brief Df utility.
 * @{
 */
/**
 * @file
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <getopt.h>
#include <sys/statfs.h>
#include <errno.h>
#include <adt/list.h>
#include <vfs/vfs.h>
#include <vfs/vfs_mtab.h>

#define NAME  "df"

#define HEADER_TABLE    "Filesystem     %4u-blocks           Used      Available Used%% Mounted on"
#define HEADER_TABLE_HR "Filesystem           Size           Used      Available Used%% Mounted on"

#define PERCENTAGE(x, tot) (tot ? (100ULL * (x) / (tot)) : 0)
#define FSBK_TO_BK(x, fsbk, bk) \
        (((fsbk) != 0 && (fsbk) < (bk)) ? \
                (unsigned long long) ((x) / ((bk) / (fsbk))) : \
                (unsigned long long) ((x) * ((fsbk) / (bk))))

static unsigned int unit_size;
static unsigned int human_readable;

static void size_to_human_readable(char *buf, uint64_t bytes);
static void print_header(void);
static void print_statfs(struct statfs *, char *, char *);
static void print_usage(void);

int main(int argc, char *argv[])
{
        int optres, errflg = 0;
        struct statfs st;

        unit_size = 512;
        human_readable = 0;

        /******************************************/
        /*   Parse command line options...        */
        /******************************************/
        while ((optres = getopt(argc, argv, ":uhb:")) != -1) {
                switch(optres) {
                case 'u':
                        print_usage();
                        return 0;

                case 'h':
                        human_readable = 1;
                        break;

                case 'b':
                        str_uint32_t(optarg, NULL, 0, 0, &unit_size);
                        break;
 
                case ':':
                        fprintf(stderr, "Option -%c requires an operand\n",
                            optopt);
                        errflg++;
                        break;

                case '?':
                        fprintf(stderr, "Unrecognized option: -%c\n", optopt);
                        errflg++;
                        break;

                default:
                        fprintf(stderr,
                            "Unknown error while parsing command line options");
                        errflg++;
                        break;
                }
        }

        if (optind > argc) {
                fprintf(stderr, "Too many input parameters\n");
                errflg++;
        }

        if (errflg) {
                print_usage();
                return 1;
        }

        LIST_INITIALIZE(mtab_list);
        vfs_get_mtab_list(&mtab_list);

        print_header();
        list_foreach(mtab_list, link, mtab_ent_t, mtab_ent) {
                if (statfs(mtab_ent->mp, &st) == 0) {
                        print_statfs(&st, mtab_ent->fs_name, mtab_ent->mp);
                } else {
                        fprintf(stderr, "Cannot get information for '%s' (%d).\n",
                            mtab_ent->mp, errno);
                }
        }

        putchar('\n');
        return 0;
}

static void size_to_human_readable(char *buf, uint64_t bytes)
{
        const char *units = "BkMGTPEZY";
        int i = 0;

        while (bytes >= 1024) {
                bytes /= 1024;
                i++;
        }

        snprintf(buf, 6, "%4llu%c", (unsigned long long) bytes, units[i]);
}

static void print_header(void)
{
        if (human_readable)
                printf(HEADER_TABLE_HR);
        else
                printf(HEADER_TABLE, unit_size);

        putchar('\n');
}

static void print_statfs(struct statfs *st, char *name, char *mountpoint)
{
        uint64_t const used_blocks = st->f_blocks - st->f_bfree;
        unsigned const perc_used = PERCENTAGE(used_blocks, st->f_blocks);

        printf("%10s", name);

        if (human_readable) {
                char tmp[1024];

                /* Print size */
                size_to_human_readable(tmp, st->f_blocks *  st->f_bsize);
                printf(" %14s", tmp);

                /* Number of used blocks */
                size_to_human_readable(tmp, used_blocks  *  st->f_bsize);
                printf(" %14s", tmp);

                /* Number of available blocks */
                size_to_human_readable(tmp, st->f_bfree *  st->f_bsize);
                printf(" %14s", tmp);

                /* Percentage of used blocks */
                printf(" %4u%%", perc_used);

                /* Mount point */
                printf(" %s\n", mountpoint);
        } else {
                /* Blocks / Used blocks / Available blocks / Used% / Mounted on */
                printf(" %15llu %14llu %14llu %4u%% %s\n", 
                    FSBK_TO_BK(st->f_blocks, st->f_bsize, unit_size),
                    FSBK_TO_BK(used_blocks, st->f_bsize, unit_size),
                    FSBK_TO_BK(st->f_bfree, st->f_bsize, unit_size),
                    perc_used,
                    mountpoint);
        }

}

static void print_usage(void)
{
        printf("syntax: %s [-u] [-h] [-b <size>] \n", NAME);
        printf("  u : Show usage.\n");
        printf("  h : \"Human-readable\" output.\n");
        printf("  b : Scale block sizes by selected size.\n");
        printf("\n");
}

/** @}
 */