468 lines
10 KiB
C
468 lines
10 KiB
C
/* $NetBSD: compress.c,v 1.29 2022/05/22 21:39:44 rillig Exp $ */
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/*-
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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. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1992, 1993\
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The Regents of the University of California. All rights reserved.");
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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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#else
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__RCSID("$NetBSD: compress.c,v 1.29 2022/05/22 21:39:44 rillig Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/time.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 <stdarg.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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static void compress(const char *, const char *, int);
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static void cwarn(const char *, ...) __printflike(1, 2);
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static void cwarnx(const char *, ...) __printflike(1, 2);
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static void decompress(const char *, const char *, int);
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static int permission(const char *);
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static void setfile(const char *, struct stat *);
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__dead static void usage(int);
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extern FILE *zopen(const char *fname, const char *mode, int bits);
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static int eval, force, verbose;
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static int isstdout, isstdin;
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int
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main(int argc, char **argv)
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{
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enum {COMPRESS, DECOMPRESS} style = COMPRESS;
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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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if ((p = strrchr(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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style = DECOMPRESS;
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cat = 1;
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} else
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errx(1, "unknown program name");
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bits = cat = 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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isstdout = 1;
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isstdin = 1;
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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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isstdout = 1;
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isstdin = 1;
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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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isstdout = 0;
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switch (style) {
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case COMPRESS:
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if (cat) {
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isstdout = 1;
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compress(*argv, "/dev/stdout", bits);
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break;
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}
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if ((p = strrchr(*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 = strrchr(*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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if (cat)
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isstdout = 1;
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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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if (cat)
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isstdout = 1;
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}
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break;
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}
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}
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exit (eval);
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}
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static void
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compress(const char *in, const char *out, int bits)
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{
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size_t nr;
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struct stat isb, sb;
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const char *error = NULL;
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FILE *ifp, *ofp;
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int exists, isreg, oreg;
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u_char buf[BUFSIZ];
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if (!isstdout) {
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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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oreg = !exists || S_ISREG(sb.st_mode);
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} else
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oreg = 0;
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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 (!isstdin) {
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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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else
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isreg = 1;
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} else
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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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oreg <<= 1;
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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))
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error = in;
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if (fclose(ifp))
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if (error == NULL)
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error = in;
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if (fclose(ofp))
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if (error == NULL)
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error = out;
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ifp = NULL;
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ofp = NULL;
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if (error) {
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cwarn("%s", error);
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goto err;
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}
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if (isreg && oreg) {
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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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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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((double)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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((double)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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(void)fclose(ofp);
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if (oreg == 2)
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(void)unlink(out);
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if (ifp)
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(void)fclose(ifp);
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}
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static void
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decompress(const char *in, const char *out, int bits)
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{
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size_t 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[BUFSIZ];
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if (!isstdout) {
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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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oreg = !exists || S_ISREG(sb.st_mode);
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} else
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oreg = 0;
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ifp = ofp = NULL;
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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 (!isstdin) {
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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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else
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isreg = 1;
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} else
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isreg = 0;
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if ((nr = fread(buf, 1, sizeof(buf), ifp)) == 0) {
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cwarn("%s", in);
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goto err;
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}
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if ((ofp = fopen(out, "w")) == NULL) {
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cwarn("%s", out);
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goto err;
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}
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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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oreg <<= 1;
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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)) {
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cwarn("%s", in);
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goto err;
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}
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if (fclose(ifp)) {
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ifp = NULL;
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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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ofp = NULL;
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cwarn("%s", out);
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goto err;
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}
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if (isreg && oreg) {
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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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(void)fclose(ofp);
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if (oreg == 2)
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(void)unlink(out);
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if (ifp)
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(void)fclose(ifp);
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}
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static void
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setfile(const char *name, 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))
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cwarn("chown: %s", name);
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/*
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* Restore the file's flags. However, do this only if the original
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* file had any flags set; this avoids a warning on file-systems that
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* do not support flags.
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*/
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if (fs->st_flags != 0 && chflags(name, fs->st_flags))
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cwarn("chflags: %s", name);
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}
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static int
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permission(const 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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static void
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usage(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 [-cdfv] [-b bits] [file ...]\n");
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else
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(void)fprintf(stderr,
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"usage: uncompress [-cdfv] [-b bits] [file ...]\n");
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exit(1);
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}
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static void
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cwarnx(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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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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static void
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cwarn(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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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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