source: mainline/uspace/app/df/df.c@ 523a4b6

/*
 * 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>

#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) ((unsigned long long) (100L * (x) / (tot)))  
#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 int 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 parameter\n");
                errflg++;
        }
        
        if (errflg) {
                print_usage();
                return 1;
        }
        
        LIST_INITIALIZE(mtab_list);
        get_mtab_list(&mtab_list);
        print_header();
        list_foreach(mtab_list, cur) {
                mtab_ent_t *mtab_ent = list_get_instance(cur, mtab_ent_t,
                    link);
                statfs(mtab_ent->mp, &st);
                print_statfs(&st, mtab_ent->fs_name, mtab_ent->mp);
        }
        putchar('\n');  
        return 0;
}

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

        limit = str_length(units);
        while (bytes >= 1024) {
                if (i >= limit) 
                        return -1;
                bytes /= 1024;
                i++;
        }
        snprintf(buf, 6, "%4llu%c", (unsigned long long)bytes, units[i]);

        return 0;
}

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)
{
        printf("%10s", name);
        
        if (human_readable) {
                char tmp[1024];
                size_to_human_readable(tmp, st->f_blocks *  st->f_bsize);
                printf(" %14s", tmp);                                                                  /* Size       */
                size_to_human_readable(tmp, (st->f_blocks - st->f_bfree)  *  st->f_bsize);
                printf(" %14s", tmp);                                                                  /* Used       */
                size_to_human_readable(tmp, st->f_bfree *  st->f_bsize);
                printf(" %14s", tmp);                                                                  /* Available  */
                printf(" %4llu%% %s\n", 
                        (st->f_blocks)?PERCENTAGE(st->f_blocks - st->f_bfree, st->f_blocks):0L,        /* Used%      */
                        mountpoint                                                                     /* Mounted on */
                );
        }
        else
                printf(" %15llu %14llu %14llu %4llu%% %s\n", 
                        FSBK_TO_BK(st->f_blocks, st->f_bsize, unit_size),                              /* Blocks     */
                        FSBK_TO_BK(st->f_blocks - st->f_bfree, st->f_bsize, unit_size),                /* Used       */
                        FSBK_TO_BK(st->f_bfree, st->f_bsize, unit_size),                               /* Available  */
                        (st->f_blocks)?PERCENTAGE(st->f_blocks - st->f_bfree, st->f_blocks):0L,        /* Used%      */
                        mountpoint                                                                     /* Mounted on */
                );
        
}

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

/** @}
 */