source: MondoRescue/branches/2.2.8.selinux/mindi-busybox/coreutils/du.c@ 3528

/* vi: set sw=4 ts=4: */
/*
 * Mini du implementation for busybox
 *
 * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
 * Copyright (C) 2002  Edward Betts <edward@debian.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
 * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
 *    The -d option allows setting of max depth (similar to gnu --max-depth).
 * 2) Fixed incorrect size calculations for links and directories, especially
 *    when errors occurred.  Calculates sizes should now match gnu du output.
 * 3) Added error checking of output.
 * 4) Fixed busybox bug #1284 involving long overflow with human_readable.
 */

#include "libbb.h"

#if ENABLE_FEATURE_HUMAN_READABLE
# if ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
static unsigned long disp_hr = 1024;
# else
static unsigned long disp_hr = 512;
# endif
#elif ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
static unsigned disp_k = 1;
#else
static unsigned disp_k; /* bss inits to 0 */
#endif

static int max_print_depth = INT_MAX;
static nlink_t count_hardlinks = 1;

static int status;
static int print_files;
static int slink_depth;
static int du_depth;
static int one_file_system;
static dev_t dir_dev;


static void print(long size, const char *const filename)
{
    /* TODO - May not want to defer error checking here. */
#if ENABLE_FEATURE_HUMAN_READABLE
    printf("%s\t%s\n", make_human_readable_str(size, 512, disp_hr),
            filename);
#else
    if (disp_k) {
        size++;
        size >>= 1;
    }
    printf("%ld\t%s\n", size, filename);
#endif
}

/* tiny recursive du */
static long du(const char *const filename)
{
    struct stat statbuf;
    long sum;

    if (lstat(filename, &statbuf) != 0) {
        bb_perror_msg("%s", filename);
        status = EXIT_FAILURE;
        return 0;
    }

    if (one_file_system) {
        if (du_depth == 0) {
            dir_dev = statbuf.st_dev;
        } else if (dir_dev != statbuf.st_dev) {
            return 0;
        }
    }

    sum = statbuf.st_blocks;

    if (S_ISLNK(statbuf.st_mode)) {
        if (slink_depth > du_depth) {   /* -H or -L */
            if (stat(filename, &statbuf) != 0) {
                bb_perror_msg("%s", filename);
                status = EXIT_FAILURE;
                return 0;
            }
            sum = statbuf.st_blocks;
            if (slink_depth == 1) {
                slink_depth = INT_MAX;  /* Convert -H to -L. */
            }
        }
    }

    if (statbuf.st_nlink > count_hardlinks) {
        /* Add files/directories with links only once */
        if (is_in_ino_dev_hashtable(&statbuf)) {
            return 0;
        }
        add_to_ino_dev_hashtable(&statbuf, NULL);
    }

    if (S_ISDIR(statbuf.st_mode)) {
        DIR *dir;
        struct dirent *entry;
        char *newfile;

        dir = warn_opendir(filename);
        if (!dir) {
            status = EXIT_FAILURE;
            return sum;
        }

        newfile = last_char_is(filename, '/');
        if (newfile)
            *newfile = '\0';

        while ((entry = readdir(dir))) {
            char *name = entry->d_name;

            newfile = concat_subpath_file(filename, name);
            if (newfile == NULL)
                continue;
            ++du_depth;
            sum += du(newfile);
            --du_depth;
            free(newfile);
        }
        closedir(dir);
    } else if (du_depth > print_files) {
        return sum;
    }
    if (du_depth <= max_print_depth) {
        print(sum, filename);
    }
    return sum;
}

int du_main(int argc, char **argv);
int du_main(int argc, char **argv)
{
    long total;
    int slink_depth_save;
    int print_final_total;
    char *smax_print_depth;
    unsigned opt;

#if ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
    if (getenv("POSIXLY_CORRECT")) {    /* TODO - a new libbb function? */
#if ENABLE_FEATURE_HUMAN_READABLE
        disp_hr = 512;
#else
        disp_k = 0;
#endif
    }
#endif

    /* Note: SUSv3 specifies that -a and -s options cannot be used together
     * in strictly conforming applications.  However, it also says that some
     * du implementations may produce output when -a and -s are used together.
     * gnu du exits with an error code in this case.  We choose to simply
     * ignore -a.  This is consistent with -s being equivalent to -d 0.
     */
#if ENABLE_FEATURE_HUMAN_READABLE
    opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
    opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
    if (opt & (1 << 9)) {
        /* -h opt */
        disp_hr = 0;
    }
    if (opt & (1 << 10)) {
        /* -m opt */
        disp_hr = 1024*1024;
    }
    if (opt & (1 << 2)) {
        /* -k opt */
        disp_hr = 1024;
    }
#else
    opt_complementary = "H-L:L-H:s-d:d-s";
    opt = getopt32(argv, "aHkLsx" "d:" "lc", &smax_print_depth);
#if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
    if (opt & (1 << 2)) {
        /* -k opt */
        disp_k = 1;
    }
#endif
#endif
    if (opt & (1 << 0)) {
        /* -a opt */
        print_files = INT_MAX;
    }
    if (opt & (1 << 1)) {
        /* -H opt */
        slink_depth = 1;
    }
    if (opt & (1 << 3)) {
        /* -L opt */
        slink_depth = INT_MAX;
    }
    if (opt & (1 << 4)) {
        /* -s opt */
        max_print_depth = 0;
    }
    one_file_system = opt & (1 << 5); /* -x opt */
    if (opt & (1 << 6)) {
        /* -d opt */
        max_print_depth = xatoi_u(smax_print_depth);
    }
    if (opt & (1 << 7)) {
        /* -l opt */
        count_hardlinks = MAXINT(nlink_t);
    }
    print_final_total = opt & (1 << 8); /* -c opt */

    /* go through remaining args (if any) */
    argv += optind;
    if (optind >= argc) {
        *--argv = (char*)".";
        if (slink_depth == 1) {
            slink_depth = 0;
        }
    }

    slink_depth_save = slink_depth;
    total = 0;
    do {
        total += du(*argv);
        slink_depth = slink_depth_save;
    } while (*++argv);
    if (ENABLE_FEATURE_CLEAN_UP)
        reset_ino_dev_hashtable();
    if (print_final_total) {
        print(total, "total");
    }

    fflush_stdout_and_exit(status);
}