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b3608ae18f
The index() and rindex() functions were marked LEGACY in the 2001 revision of POSIX and were subsequently removed from the 2008 revision. The strchr() and strrchr() functions are part of the C standard. This makes the source code a lot more consistent, as most of these C files also call into other str*() routines. In fact, about a dozen already perform strchr() calls.
437 lines
9.5 KiB
C
437 lines
9.5 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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* 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
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)compress.c 8.2 (Berkeley) 1/7/94";
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#endif
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.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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#include "zopen.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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static void usage(int);
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static int eval, force, verbose;
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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;
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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 = 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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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 (strcmp(*argv, "-") == 0) {
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compress("/dev/stdin", "/dev/stdout", bits);
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break;
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} else 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 = 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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if (strcmp(*argv, "-") == 0) {
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decompress("/dev/stdin", "/dev/stdout", bits);
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break;
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}
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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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} 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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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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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)fprintf(stderr, "%s: file would grow; left unmodified\n",
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in);
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eval = 2;
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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)fprintf(stderr, "%s: ", out);
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if (isb.st_size > sb.st_size)
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(void)fprintf(stderr, "%.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)fprintf(stderr, "%.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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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[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 = zopen(in, "r", bits)) == NULL) {
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cwarn("%s", in);
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return;
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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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/*
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* Try to read the first few uncompressed bytes from the input file
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* before blindly truncating the output file.
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*/
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if ((nr = fread(buf, 1, sizeof(buf), ifp)) == 0) {
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cwarn("%s", in);
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(void)fclose(ifp);
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return;
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}
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if ((ofp = fopen(out, "w")) == NULL ||
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(nr != 0 && fwrite(buf, 1, nr, ofp) != nr)) {
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cwarn("%s", out);
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(void)fclose(ifp);
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return;
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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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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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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_atim);
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TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtim);
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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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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 [-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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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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