minix/commands/du/du.c
2010-05-12 16:28:54 +00:00

243 lines
5.8 KiB
C

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