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Diffstat (limited to 'coreutils/du.c')
| -rw-r--r-- | coreutils/du.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/coreutils/du.c b/coreutils/du.c new file mode 100644 index 0000000..efc9bb9 --- /dev/null +++ b/coreutils/du.c @@ -0,0 +1,240 @@ +/* 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" + +struct globals { +#if ENABLE_FEATURE_HUMAN_READABLE + unsigned long disp_hr; +#else + unsigned disp_k; +#endif + + int max_print_depth; + nlink_t count_hardlinks; + + bool status; + bool one_file_system; + int print_files; + int slink_depth; + int du_depth; + dev_t dir_dev; +}; +#define G (*(struct globals*)&bb_common_bufsiz1) + + +static void print(unsigned long size, const char *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, G.disp_hr), + filename); +#else + if (G.disp_k) { + size++; + size >>= 1; + } + printf("%ld\t%s\n", size, filename); +#endif +} + +/* tiny recursive du */ +static unsigned long du(const char *filename) +{ + struct stat statbuf; + unsigned long sum; + + if (lstat(filename, &statbuf) != 0) { + bb_simple_perror_msg(filename); + G.status = EXIT_FAILURE; + return 0; + } + + if (G.one_file_system) { + if (G.du_depth == 0) { + G.dir_dev = statbuf.st_dev; + } else if (G.dir_dev != statbuf.st_dev) { + return 0; + } + } + + sum = statbuf.st_blocks; + + if (S_ISLNK(statbuf.st_mode)) { + if (G.slink_depth > G.du_depth) { /* -H or -L */ + if (stat(filename, &statbuf) != 0) { + bb_simple_perror_msg(filename); + G.status = EXIT_FAILURE; + return 0; + } + sum = statbuf.st_blocks; + if (G.slink_depth == 1) { + G.slink_depth = INT_MAX; /* Convert -H to -L. */ + } + } + } + + if (statbuf.st_nlink > G.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) { + G.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; + ++G.du_depth; + sum += du(newfile); + --G.du_depth; + free(newfile); + } + closedir(dir); + } else if (G.du_depth > G.print_files) { + return sum; + } + if (G.du_depth <= G.max_print_depth) { + print(sum, filename); + } + return sum; +} + +int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int du_main(int argc UNUSED_PARAM, char **argv) +{ + unsigned long total; + int slink_depth_save; + bool print_final_total; + unsigned opt; + +#if ENABLE_FEATURE_HUMAN_READABLE + USE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;) + SKIP_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;) + if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */ + G.disp_hr = 512; +#else + USE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;) + /* SKIP_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */ +#endif + G.max_print_depth = INT_MAX; + G.count_hardlinks = 1; + + /* 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:d+"; + opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth); + argv += optind; + if (opt & (1 << 9)) { + /* -h opt */ + G.disp_hr = 0; + } + if (opt & (1 << 10)) { + /* -m opt */ + G.disp_hr = 1024*1024; + } + if (opt & (1 << 2)) { + /* -k opt */ + G.disp_hr = 1024; + } +#else + opt_complementary = "H-L:L-H:s-d:d-s:d+"; + opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth); + argv += optind; +#if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K + if (opt & (1 << 2)) { + /* -k opt */ + G.disp_k = 1; + } +#endif +#endif + if (opt & (1 << 0)) { + /* -a opt */ + G.print_files = INT_MAX; + } + if (opt & (1 << 1)) { + /* -H opt */ + G.slink_depth = 1; + } + if (opt & (1 << 3)) { + /* -L opt */ + G.slink_depth = INT_MAX; + } + if (opt & (1 << 4)) { + /* -s opt */ + G.max_print_depth = 0; + } + G.one_file_system = opt & (1 << 5); /* -x opt */ + if (opt & (1 << 7)) { + /* -l opt */ + G.count_hardlinks = MAXINT(nlink_t); + } + print_final_total = opt & (1 << 8); /* -c opt */ + + /* go through remaining args (if any) */ + if (!*argv) { + *--argv = (char*)"."; + if (G.slink_depth == 1) { + G.slink_depth = 0; + } + } + + slink_depth_save = G.slink_depth; + total = 0; + do { + total += du(*argv); + G.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(G.status); +} |