du.c revision 1.23
1 /* $NetBSD: du.c,v 1.23 2003/08/07 11:13:34 agc 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)du.c 8.5 (Berkeley) 5/4/95"; 44 #else 45 __RCSID("$NetBSD: du.c,v 1.23 2003/08/07 11:13:34 agc Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/types.h> 50 #include <sys/stat.h> 51 52 #include <dirent.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <fts.h> 56 #include <util.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 int linkchk __P((FTSENT *)); 63 int main __P((int, char **)); 64 void prstat __P((const char *, int64_t)); 65 void usage __P((void)); 66 67 int hflag; 68 long blocksize; 69 70 int 71 main(argc, argv) 72 int argc; 73 char *argv[]; 74 { 75 FTS *fts; 76 FTSENT *p; 77 int64_t totalblocks; 78 int ftsoptions, listdirs, listfiles; 79 int Hflag, Lflag, Pflag, aflag, ch, cflag, gkmflag, rval, sflag; 80 char *noargv[2]; 81 82 Hflag = Lflag = Pflag = aflag = cflag = gkmflag = sflag = 0; 83 totalblocks = 0; 84 ftsoptions = FTS_PHYSICAL; 85 while ((ch = getopt(argc, argv, "HLPacghkmrsx")) != -1) 86 switch (ch) { 87 case 'H': 88 Hflag = 1; 89 Lflag = Pflag = 0; 90 break; 91 case 'L': 92 Lflag = 1; 93 Hflag = Pflag = 0; 94 break; 95 case 'P': 96 Pflag = 1; 97 Hflag = Lflag = 0; 98 break; 99 case 'a': 100 aflag = 1; 101 break; 102 case 'c': 103 cflag = 1; 104 break; 105 case 'g': 106 blocksize = 1024 * 1024 * 1024; 107 gkmflag = 1; 108 break; 109 case 'h': 110 hflag = 1; 111 break; 112 case 'k': 113 blocksize = 1024; 114 gkmflag = 1; 115 break; 116 case 'm': 117 blocksize = 1024 * 1024; 118 gkmflag = 1; 119 break; 120 case 'r': 121 break; 122 case 's': 123 sflag = 1; 124 break; 125 case 'x': 126 ftsoptions |= FTS_XDEV; 127 break; 128 case '?': 129 default: 130 usage(); 131 } 132 argc -= optind; 133 argv += optind; 134 135 /* 136 * XXX 137 * Because of the way that fts(3) works, logical walks will not count 138 * the blocks actually used by symbolic links. We rationalize this by 139 * noting that users computing logical sizes are likely to do logical 140 * copies, so not counting the links is correct. The real reason is 141 * that we'd have to re-implement the kernel's symbolic link traversing 142 * algorithm to get this right. If, for example, you have relative 143 * symbolic links referencing other relative symbolic links, it gets 144 * very nasty, very fast. The bottom line is that it's documented in 145 * the man page, so it's a feature. 146 */ 147 if (Hflag) 148 ftsoptions |= FTS_COMFOLLOW; 149 if (Lflag) { 150 ftsoptions &= ~FTS_PHYSICAL; 151 ftsoptions |= FTS_LOGICAL; 152 } 153 154 if (aflag) { 155 if (sflag) 156 usage(); 157 listdirs = listfiles = 1; 158 } else if (sflag) 159 listdirs = listfiles = 0; 160 else { 161 listfiles = 0; 162 listdirs = 1; 163 } 164 165 if (!*argv) { 166 noargv[0] = "."; 167 noargv[1] = NULL; 168 argv = noargv; 169 } 170 171 if (!gkmflag) 172 (void)getbsize(NULL, &blocksize); 173 blocksize /= 512; 174 175 if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL) 176 err(1, "fts_open `%s'", *argv); 177 178 for (rval = 0; (p = fts_read(fts)) != NULL;) 179 switch (p->fts_info) { 180 case FTS_D: /* Ignore. */ 181 break; 182 case FTS_DP: 183 p->fts_parent->fts_number += 184 p->fts_number += p->fts_statp->st_blocks; 185 if (cflag) 186 totalblocks += p->fts_statp->st_blocks; 187 /* 188 * If listing each directory, or not listing files 189 * or directories and this is post-order of the 190 * root of a traversal, display the total. 191 */ 192 if (listdirs || (!listfiles && !p->fts_level)) 193 prstat(p->fts_path, p->fts_number); 194 break; 195 case FTS_DC: /* Ignore. */ 196 break; 197 case FTS_DNR: /* Warn, continue. */ 198 case FTS_ERR: 199 case FTS_NS: 200 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 201 rval = 1; 202 break; 203 default: 204 if (p->fts_statp->st_nlink > 1 && linkchk(p)) 205 break; 206 /* 207 * If listing each file, or a non-directory file was 208 * the root of a traversal, display the total. 209 */ 210 if (listfiles || !p->fts_level) 211 prstat(p->fts_path, p->fts_statp->st_blocks); 212 p->fts_parent->fts_number += p->fts_statp->st_blocks; 213 if (cflag) 214 totalblocks += p->fts_statp->st_blocks; 215 } 216 if (errno) 217 err(1, "fts_read"); 218 if (cflag) 219 prstat("total", totalblocks); 220 exit(rval); 221 } 222 223 void 224 prstat(const char *fname, int64_t blocks) 225 { 226 if (hflag) { 227 char buf[5]; 228 int64_t sz = blocks * 512; 229 230 humanize_number(buf, sizeof(buf), sz, "", HN_AUTOSCALE, 231 HN_B | HN_NOSPACE | HN_DECIMAL); 232 233 (void)printf("%s\t%s\n", buf, fname); 234 } else 235 (void)printf("%lld\t%s\n", 236 (long long)howmany(blocks, (int64_t)blocksize), 237 fname); 238 } 239 240 241 typedef struct _ID { 242 dev_t dev; 243 ino_t inode; 244 } ID; 245 246 int 247 linkchk(p) 248 FTSENT *p; 249 { 250 static ID *files; 251 static int maxfiles, nfiles; 252 ID *fp, *start; 253 ino_t ino; 254 dev_t dev; 255 256 ino = p->fts_statp->st_ino; 257 dev = p->fts_statp->st_dev; 258 if ((start = files) != NULL) 259 for (fp = start + nfiles - 1; fp >= start; --fp) 260 if (ino == fp->inode && dev == fp->dev) 261 return (1); 262 263 if (nfiles == maxfiles && (files = realloc((char *)files, 264 (u_int)(sizeof(ID) * (maxfiles += 128)))) == NULL) 265 err(1, "realloc"); 266 files[nfiles].inode = ino; 267 files[nfiles].dev = dev; 268 ++nfiles; 269 return (0); 270 } 271 272 void 273 usage() 274 { 275 276 (void)fprintf(stderr, 277 "usage: du [-H | -L | -P] [-a | -s] [-cghkmrx] [file ...]\n"); 278 exit(1); 279 } 280
Indexes created Tue Sep 30 17:09:57 GMT 2025