2005-04-21 16:53:53 +02:00
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/* du - report on disk usage Author: Alistair G. Crooks */
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/*
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* du.c 1.1 27/5/87 agc Joypace Ltd.
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* 1.2 24 Mar 89 nick@nswitgould.oz
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* 1.3 31 Mar 89 nick@nswitgould.oz
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* 1.4 22 Feb 90 meulenbr@cst.prl.philips.nl
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* 1.5 09 Jul 91 hp@vmars.tuwien.ac.at
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* 1.6 01 Oct 92 kjb@cs.vu.nl
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* 1.7 04 Jan 93 bde
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* 1.8 19 Sep 94 kjb
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* 1.9 28 Oct 99 kjb
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*
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* Copyright 1987, Joypace Ltd., London UK. All rights reserved.
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* This code may be freely distributed, provided that this notice
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* remains attached.
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*
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* du - a public domain interpretation of du(1).
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*
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* 1.2: Fixed bug involving 14 character long filenames
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* 1.3: Add [-l levels] option to restrict printing.
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* 1.4: Added processing of multiple arguments
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* 1.5: Fixed processing of multiple arguments. General cleanup.
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* 1.6: Use readdir
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* 1.7: Merged 1.5 and 1.6.
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* Print totals even for non-dirs at top level.
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* Count blocks for each dir before printing total for the dir.
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* Count blocks for all non-special files.
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* Don't clutter link buffer with directories.
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* 1.8: Remember all links.
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* 1.9: Added -x flag to not cross device boundaries. Type fixes.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <minix/config.h>
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#include <minix/const.h>
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extern char *optarg;
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extern int optind;
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#define LINELEN 256
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#define NR_ALREADY 512
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#ifdef S_IFLNK
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#define LSTAT lstat
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#else
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#define LSTAT stat
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#endif
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typedef struct already {
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struct already *al_next;
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int al_dev;
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ino_t al_inum;
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nlink_t al_nlink;
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} ALREADY;
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_PROTOTYPE(int main, (int argc, char **argv));
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2010-04-21 13:05:22 +02:00
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PRIVATE _PROTOTYPE(int makedname, (char *d, char *f, char *out, int outlen));
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2010-04-13 12:58:41 +02:00
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_PROTOTYPE(int done, (dev_t dev, ino_t inum, nlink_t nlink));
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_PROTOTYPE(long dodir, (char *d, int thislev, dev_t dev));
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2005-04-21 16:53:53 +02:00
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char *prog; /* program name */
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char *optstr = "asxdl:"; /* options */
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int silent = 0; /* silent mode */
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int all = 0; /* all directory entries mode */
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int crosschk = 0; /* do not cross device boundaries mode */
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char *startdir = "."; /* starting from here */
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int levels = 20000; /* # of directory levels to print */
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ALREADY *already[NR_ALREADY];
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int alc;
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/*
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* makedname - make the pathname from the directory name, and the
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* directory entry, placing it in out. If this would overflow,
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* return 0, otherwise 1.
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*/
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2010-04-21 13:05:22 +02:00
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PRIVATE int makedname(char *d, char *f, char *out, int outlen)
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2005-04-21 16:53:53 +02:00
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{
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char *cp;
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2010-04-21 13:05:22 +02:00
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int length = strlen(f);
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2005-04-21 16:53:53 +02:00
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if (strlen(d) + length + 2 > outlen) return(0);
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for (cp = out; *d; *cp++ = *d++);
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if (*(cp - 1) != '/') *cp++ = '/';
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while (length--) *cp++ = *f++;
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*cp = '\0';
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return(1);
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}
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/*
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* done - have we encountered (dev, inum) before? Returns 1 for yes,
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* 0 for no, and remembers (dev, inum, nlink).
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*/
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2010-04-13 12:58:41 +02:00
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int done(dev_t dev, ino_t inum, nlink_t nlink)
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2005-04-21 16:53:53 +02:00
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{
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register ALREADY **pap, *ap;
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pap = &already[(unsigned) inum % NR_ALREADY];
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while ((ap = *pap) != NULL) {
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if (ap->al_inum == inum && ap->al_dev == dev) {
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if (--ap->al_nlink == 0) {
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*pap = ap->al_next;
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free(ap);
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}
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return(1);
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}
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pap = &ap->al_next;
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}
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if ((ap = malloc(sizeof(*ap))) == NULL) {
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fprintf(stderr, "du: Out of memory\n");
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exit(1);
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}
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ap->al_next = NULL;
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ap->al_inum = inum;
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ap->al_dev = dev;
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ap->al_nlink = nlink - 1;
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*pap = ap;
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return(0);
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}
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2010-03-27 15:31:00 +01:00
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int get_block_size(const char *dir, const struct stat *st)
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2005-04-21 16:53:53 +02:00
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{
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struct statfs stfs;
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static int fs_block_size = -1, fs_dev = -1;
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int d;
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if(st->st_dev == fs_dev)
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return fs_block_size;
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if((d = open(dir, O_RDONLY)) < 0) {
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perror(dir);
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return 0;
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}
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if(fstatfs(d, &stfs) < 0) {
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perror(dir);
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return 0;
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}
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fs_block_size = stfs.f_bsize;
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fs_dev = st->st_dev;
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return fs_block_size;
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}
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/*
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* dodir - process the directory d. Return the long size (in blocks)
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* of d and its descendants.
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*/
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2010-04-13 12:58:41 +02:00
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long dodir(char *d, int thislev, dev_t dev)
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2005-04-21 16:53:53 +02:00
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{
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int maybe_print;
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struct stat s;
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long total_kb;
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char dent[LINELEN];
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DIR *dp;
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struct dirent *entry;
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int block_size;
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if (LSTAT(d, &s) < 0) {
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fprintf(stderr,
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"%s: %s: %s\n", prog, d, strerror(errno));
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return 0L;
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}
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if (s.st_dev != dev && dev != 0 && crosschk) return 0;
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block_size = get_block_size(d, &s);
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if(block_size < 1) {
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fprintf(stderr,
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"%s: %s: funny block size found (%d)\n",
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prog, d, block_size);
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return 0L;
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}
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total_kb = ((s.st_size + (block_size - 1)) / block_size) * block_size / 1024;
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switch (s.st_mode & S_IFMT) {
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case S_IFDIR:
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/* Directories should not be linked except to "." and "..", so this
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* directory should not already have been done.
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*/
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maybe_print = !silent;
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if ((dp = opendir(d)) == NULL) break;
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while ((entry = readdir(dp)) != NULL) {
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if (strcmp(entry->d_name, ".") == 0 ||
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strcmp(entry->d_name, "..") == 0)
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continue;
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if (!makedname(d, entry->d_name, dent, sizeof(dent))) continue;
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total_kb += dodir(dent, thislev - 1, s.st_dev);
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}
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closedir(dp);
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break;
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case S_IFBLK:
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case S_IFCHR:
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/* st_size for special files is not related to blocks used. */
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total_kb = 0;
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/* Fall through. */
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default:
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if (s.st_nlink > 1 && done(s.st_dev, s.st_ino, s.st_nlink)) return 0L;
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maybe_print = all;
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break;
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}
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if (thislev >= levels || (maybe_print && thislev >= 0)) {
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printf("%ld\t%s\n", total_kb, d);
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}
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return(total_kb);
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}
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int main(argc, argv)
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int argc;
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char **argv;
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{
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int c;
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prog = argv[0];
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while ((c = getopt(argc, argv, optstr)) != EOF) switch (c) {
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case 'a': all = 1; break;
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case 's': silent = 1; break;
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case 'x':
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case 'd': crosschk = 1; break;
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case 'l': levels = atoi(optarg); break;
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default:
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fprintf(stderr,
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"Usage: %s [-asx] [-l levels] [startdir]\n", prog);
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exit(1);
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}
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do {
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if (optind < argc) startdir = argv[optind++];
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alc = 0;
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(void) dodir(startdir, levels, 0);
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} while (optind < argc);
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return(0);
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}
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