da94aa4ef2
compress uses setfile() to make flags, ownership and mode of the output the same as those of the original. However, if the filesystem holding the output file doesn't support these operations, compress prints a warning. This bites a bit with NFS directories, which always fail the chflags() operation. If the file system doesn't support the operation, then the flags data wasn't valid on the original file anyway, so the warning is spurious. Submitted by: bin/16981 (Peter Edwards <peter.edwards@ireland.com>)
454 lines
9.4 KiB
C
454 lines
9.4 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1992, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)compress.c 8.2 (Berkeley) 1/7/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.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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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include "zopen.h"
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void compress __P((char *, char *, int));
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void cwarn __P((const char *, ...));
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void cwarnx __P((const char *, ...));
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void decompress __P((char *, char *, int));
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int permission __P((char *));
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void setfile __P((char *, struct stat *));
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void usage __P((int));
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int eval, force, verbose;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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enum {COMPRESS, DECOMPRESS} style;
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size_t len;
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int bits, cat, ch;
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char *p, newname[MAXPATHLEN];
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cat = 0;
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if ((p = rindex(argv[0], '/')) == NULL)
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p = argv[0];
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else
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++p;
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if (!strcmp(p, "uncompress"))
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style = DECOMPRESS;
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else if (!strcmp(p, "compress"))
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style = COMPRESS;
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else if (!strcmp(p, "zcat")) {
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cat = 1;
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style = DECOMPRESS;
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} else
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errx(1, "unknown program name");
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bits = 0;
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while ((ch = getopt(argc, argv, "b:cdfv")) != -1)
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switch(ch) {
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case 'b':
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bits = strtol(optarg, &p, 10);
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if (*p)
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errx(1, "illegal bit count -- %s", optarg);
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break;
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case 'c':
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cat = 1;
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break;
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case 'd': /* Backward compatible. */
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style = DECOMPRESS;
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break;
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case 'f':
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force = 1;
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break;
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case 'v':
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verbose = 1;
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break;
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case '?':
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default:
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usage(style == COMPRESS);
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}
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argc -= optind;
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argv += optind;
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if (argc == 0) {
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switch(style) {
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case COMPRESS:
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(void)compress("/dev/stdin", "/dev/stdout", bits);
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break;
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case DECOMPRESS:
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(void)decompress("/dev/stdin", "/dev/stdout", bits);
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break;
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}
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exit (eval);
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}
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if (cat == 1 && argc > 1)
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errx(1, "the -c option permits only a single file argument");
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for (; *argv; ++argv)
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switch(style) {
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case COMPRESS:
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if (cat) {
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compress(*argv, "/dev/stdout", bits);
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break;
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}
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if ((p = rindex(*argv, '.')) != NULL &&
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!strcmp(p, ".Z")) {
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cwarnx("%s: name already has trailing .Z",
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*argv);
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break;
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}
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len = strlen(*argv);
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if (len > sizeof(newname) - 3) {
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cwarnx("%s: name too long", *argv);
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break;
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}
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memmove(newname, *argv, len);
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newname[len] = '.';
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newname[len + 1] = 'Z';
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newname[len + 2] = '\0';
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compress(*argv, newname, bits);
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break;
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case DECOMPRESS:
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len = strlen(*argv);
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if ((p = rindex(*argv, '.')) == NULL ||
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strcmp(p, ".Z")) {
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if (len > sizeof(newname) - 3) {
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cwarnx("%s: name too long", *argv);
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break;
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}
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memmove(newname, *argv, len);
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newname[len] = '.';
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newname[len + 1] = 'Z';
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newname[len + 2] = '\0';
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decompress(newname,
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cat ? "/dev/stdout" : *argv, bits);
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} else {
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if (len - 2 > sizeof(newname) - 1) {
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cwarnx("%s: name too long", *argv);
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break;
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}
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memmove(newname, *argv, len - 2);
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newname[len - 2] = '\0';
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decompress(*argv,
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cat ? "/dev/stdout" : newname, bits);
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}
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break;
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}
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exit (eval);
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}
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void
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compress(in, out, bits)
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char *in, *out;
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int bits;
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{
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register int nr;
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struct stat isb, sb;
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FILE *ifp, *ofp;
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int exists, isreg, oreg;
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u_char buf[1024];
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exists = !stat(out, &sb);
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if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
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return;
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isreg = oreg = !exists || S_ISREG(sb.st_mode);
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ifp = ofp = NULL;
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if ((ifp = fopen(in, "r")) == NULL) {
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cwarn("%s", in);
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return;
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}
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if (stat(in, &isb)) { /* DON'T FSTAT! */
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cwarn("%s", in);
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goto err;
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}
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if (!S_ISREG(isb.st_mode))
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isreg = 0;
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if ((ofp = zopen(out, "w", bits)) == NULL) {
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cwarn("%s", out);
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goto err;
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}
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while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
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if (fwrite(buf, 1, nr, ofp) != nr) {
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cwarn("%s", out);
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goto err;
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}
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if (ferror(ifp) || fclose(ifp)) {
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cwarn("%s", in);
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goto err;
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}
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ifp = NULL;
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if (fclose(ofp)) {
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cwarn("%s", out);
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goto err;
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}
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ofp = NULL;
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if (isreg) {
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if (stat(out, &sb)) {
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cwarn("%s", out);
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goto err;
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}
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if (!force && sb.st_size >= isb.st_size) {
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if (verbose)
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(void)printf("%s: file would grow; left unmodified\n", in);
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if (unlink(out))
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cwarn("%s", out);
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goto err;
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}
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setfile(out, &isb);
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if (unlink(in))
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cwarn("%s", in);
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if (verbose) {
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(void)printf("%s: ", out);
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if (isb.st_size > sb.st_size)
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(void)printf("%.0f%% compression\n",
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((float)sb.st_size / isb.st_size) * 100.0);
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else
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(void)printf("%.0f%% expansion\n",
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((float)isb.st_size / sb.st_size) * 100.0);
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}
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}
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return;
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err: if (ofp) {
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if (oreg)
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(void)unlink(out);
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(void)fclose(ofp);
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}
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if (ifp)
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(void)fclose(ifp);
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}
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void
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decompress(in, out, bits)
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char *in, *out;
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int bits;
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{
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register int nr;
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struct stat sb;
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FILE *ifp, *ofp;
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int exists, isreg, oreg;
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u_char buf[1024];
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exists = !stat(out, &sb);
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if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
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return;
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isreg = oreg = !exists || S_ISREG(sb.st_mode);
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ifp = ofp = NULL;
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if ((ofp = fopen(out, "w")) == NULL) {
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cwarn("%s", out);
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return;
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}
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if ((ifp = zopen(in, "r", bits)) == NULL) {
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cwarn("%s", in);
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goto err;
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}
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if (stat(in, &sb)) {
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cwarn("%s", in);
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goto err;
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}
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if (!S_ISREG(sb.st_mode))
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isreg = 0;
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while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
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if (fwrite(buf, 1, nr, ofp) != nr) {
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cwarn("%s", out);
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goto err;
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}
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if (ferror(ifp) || fclose(ifp)) {
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cwarn("%s", in);
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goto err;
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}
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ifp = NULL;
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if (fclose(ofp)) {
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cwarn("%s", out);
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goto err;
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}
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if (isreg) {
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setfile(out, &sb);
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if (unlink(in))
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cwarn("%s", in);
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}
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return;
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err: if (ofp) {
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if (oreg)
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(void)unlink(out);
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(void)fclose(ofp);
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}
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if (ifp)
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(void)fclose(ifp);
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}
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void
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setfile(name, fs)
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char *name;
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register struct stat *fs;
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{
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static struct timeval tv[2];
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fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
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TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
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TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
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if (utimes(name, tv))
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cwarn("utimes: %s", name);
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/*
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* Changing the ownership probably won't succeed, unless we're root
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* or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
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* the mode; current BSD behavior is to remove all setuid bits on
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* chown. If chown fails, lose setuid/setgid bits.
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*/
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if (chown(name, fs->st_uid, fs->st_gid)) {
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if (errno != EPERM)
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cwarn("chown: %s", name);
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fs->st_mode &= ~(S_ISUID|S_ISGID);
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}
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if (chmod(name, fs->st_mode) && errno != EOPNOTSUPP)
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cwarn("chmod: %s", name);
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if (chflags(name, fs->st_flags) && errno != EOPNOTSUPP)
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cwarn("chflags: %s", name);
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}
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int
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permission(fname)
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char *fname;
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{
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int ch, first;
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if (!isatty(fileno(stderr)))
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return (0);
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(void)fprintf(stderr, "overwrite %s? ", fname);
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first = ch = getchar();
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while (ch != '\n' && ch != EOF)
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ch = getchar();
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return (first == 'y');
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}
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void
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usage(iscompress)
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int iscompress;
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{
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if (iscompress)
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(void)fprintf(stderr,
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"usage: compress [-cfv] [-b bits] [file ...]\n");
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else
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(void)fprintf(stderr,
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"usage: uncompress [-c] [-b bits] [file ...]\n");
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exit(1);
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}
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void
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#if __STDC__
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cwarnx(const char *fmt, ...)
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#else
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cwarnx(fmt, va_alist)
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int eval;
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const char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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vwarnx(fmt, ap);
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va_end(ap);
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eval = 1;
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}
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void
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#if __STDC__
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cwarn(const char *fmt, ...)
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#else
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cwarn(fmt, va_alist)
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int eval;
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const char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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vwarn(fmt, ap);
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va_end(ap);
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eval = 1;
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}
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