Annotation of src/usr.bin/du/du.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: du.c,v 1.10 1995/09/28 06:19:56 perry Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1989, 1993, 1994
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * This code is derived from software contributed to Berkeley by
! 8: * Chris Newcomb.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed by the University of
! 21: * California, Berkeley and its contributors.
! 22: * 4. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: */
! 38:
! 39: #ifndef lint
! 40: static char copyright[] =
! 41: "@(#) Copyright (c) 1989, 1993, 1994\n\
! 42: The Regents of the University of California. All rights reserved.\n";
! 43: #endif /* not lint */
! 44:
! 45: #ifndef lint
! 46: #if 0
! 47: static char sccsid[] = "@(#)du.c 8.5 (Berkeley) 5/4/95";
! 48: #else
! 49: static char rcsid[] = "$NetBSD: du.c,v 1.10 1995/09/28 06:19:56 perry Exp $";
! 50: #endif
! 51: #endif /* not lint */
! 52:
! 53: #include <sys/types.h>
! 54: #include <sys/stat.h>
! 55:
! 56: #include <dirent.h>
! 57: #include <err.h>
! 58: #include <errno.h>
! 59: #include <fts.h>
! 60: #include <stdio.h>
! 61: #include <stdlib.h>
! 62: #include <string.h>
! 63: #include <unistd.h>
! 64:
! 65: int linkchk __P((FTSENT *));
! 66: void usage __P((void));
! 67:
! 68: int
! 69: main(argc, argv)
! 70: int argc;
! 71: char *argv[];
! 72: {
! 73: FTS *fts;
! 74: FTSENT *p;
! 75: long blocksize;
! 76: int ftsoptions, listdirs, listfiles;
! 77: int Hflag, Lflag, Pflag, aflag, ch, kflag, notused, rval, sflag;
! 78: char **save;
! 79:
! 80: save = argv;
! 81: Hflag = Lflag = Pflag = aflag = kflag = sflag = 0;
! 82: ftsoptions = FTS_PHYSICAL;
! 83: while ((ch = getopt(argc, argv, "HLPaksx")) != EOF)
! 84: switch (ch) {
! 85: case 'H':
! 86: Hflag = 1;
! 87: Lflag = Pflag = 0;
! 88: break;
! 89: case 'L':
! 90: Lflag = 1;
! 91: Hflag = Pflag = 0;
! 92: break;
! 93: case 'P':
! 94: Pflag = 1;
! 95: Hflag = Lflag = 0;
! 96: break;
! 97: case 'a':
! 98: aflag = 1;
! 99: break;
! 100: case 'k':
! 101: blocksize = 1024;
! 102: kflag = 1;
! 103: break;
! 104: case 's':
! 105: sflag = 1;
! 106: break;
! 107: case 'x':
! 108: ftsoptions |= FTS_XDEV;
! 109: break;
! 110: case '?':
! 111: default:
! 112: usage();
! 113: }
! 114: argc -= optind;
! 115: argv += optind;
! 116:
! 117: /*
! 118: * XXX
! 119: * Because of the way that fts(3) works, logical walks will not count
! 120: * the blocks actually used by symbolic links. We rationalize this by
! 121: * noting that users computing logical sizes are likely to do logical
! 122: * copies, so not counting the links is correct. The real reason is
! 123: * that we'd have to re-implement the kernel's symbolic link traversing
! 124: * algorithm to get this right. If, for example, you have relative
! 125: * symbolic links referencing other relative symbolic links, it gets
! 126: * very nasty, very fast. The bottom line is that it's documented in
! 127: * the man page, so it's a feature.
! 128: */
! 129: if (Hflag)
! 130: ftsoptions |= FTS_COMFOLLOW;
! 131: if (Lflag) {
! 132: ftsoptions &= ~FTS_PHYSICAL;
! 133: ftsoptions |= FTS_LOGICAL;
! 134: }
! 135:
! 136: if (aflag) {
! 137: if (sflag)
! 138: usage();
! 139: listdirs = listfiles = 1;
! 140: } else if (sflag)
! 141: listdirs = listfiles = 0;
! 142: else {
! 143: listfiles = 0;
! 144: listdirs = 1;
! 145: }
! 146:
! 147: if (!*argv) {
! 148: argv = save;
! 149: argv[0] = ".";
! 150: argv[1] = NULL;
! 151: }
! 152:
! 153: if (!kflag)
! 154: (void)getbsize(¬used, &blocksize);
! 155: blocksize /= 512;
! 156:
! 157: if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL)
! 158: err(1, NULL);
! 159:
! 160: for (rval = 0; (p = fts_read(fts)) != NULL;)
! 161: switch (p->fts_info) {
! 162: case FTS_D: /* Ignore. */
! 163: break;
! 164: case FTS_DP:
! 165: p->fts_parent->fts_number +=
! 166: p->fts_number += p->fts_statp->st_blocks;
! 167: /*
! 168: * If listing each directory, or not listing files
! 169: * or directories and this is post-order of the
! 170: * root of a traversal, display the total.
! 171: */
! 172: if (listdirs || !listfiles && !p->fts_level)
! 173: (void)printf("%ld\t%s\n",
! 174: howmany(p->fts_number, blocksize),
! 175: p->fts_path);
! 176: break;
! 177: case FTS_DC: /* Ignore. */
! 178: break;
! 179: case FTS_DNR: /* Warn, continue. */
! 180: case FTS_ERR:
! 181: case FTS_NS:
! 182: warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
! 183: rval = 1;
! 184: break;
! 185: default:
! 186: if (p->fts_statp->st_nlink > 1 && linkchk(p))
! 187: break;
! 188: /*
! 189: * If listing each file, or a non-directory file was
! 190: * the root of a traversal, display the total.
! 191: */
! 192: if (listfiles || !p->fts_level)
! 193: (void)printf("%qd\t%s\n",
! 194: howmany(p->fts_statp->st_blocks, blocksize),
! 195: p->fts_path);
! 196: p->fts_parent->fts_number += p->fts_statp->st_blocks;
! 197: }
! 198: if (errno)
! 199: err(1, "fts_read");
! 200: exit(0);
! 201: }
! 202:
! 203: typedef struct _ID {
! 204: dev_t dev;
! 205: ino_t inode;
! 206: } ID;
! 207:
! 208: int
! 209: linkchk(p)
! 210: FTSENT *p;
! 211: {
! 212: static ID *files;
! 213: static int maxfiles, nfiles;
! 214: ID *fp, *start;
! 215: ino_t ino;
! 216: dev_t dev;
! 217:
! 218: ino = p->fts_statp->st_ino;
! 219: dev = p->fts_statp->st_dev;
! 220: if ((start = files) != NULL)
! 221: for (fp = start + nfiles - 1; fp >= start; --fp)
! 222: if (ino == fp->inode && dev == fp->dev)
! 223: return (1);
! 224:
! 225: if (nfiles == maxfiles && (files = realloc((char *)files,
! 226: (u_int)(sizeof(ID) * (maxfiles += 128)))) == NULL)
! 227: err(1, "");
! 228: files[nfiles].inode = ino;
! 229: files[nfiles].dev = dev;
! 230: ++nfiles;
! 231: return (0);
! 232: }
! 233:
! 234: void
! 235: usage()
! 236: {
! 237:
! 238: (void)fprintf(stderr,
! 239: "usage: du [-H | -L | -P] [-a | -s] [-kx] [file ...]\n");
! 240: exit(1);
! 241: }
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