OpenBSD-4.6/usr.bin/compress/main.c
/* $OpenBSD: main.c,v 1.75 2009/04/18 18:21:54 naddy Exp $ */
#ifndef SMALL
static const char copyright[] =
"@(#) Copyright (c) 1992, 1993\n\
The Regents of the University of California. All rights reserved.\n"
"Copyright (c) 1997-2002 Michael Shalayeff\n";
#endif
#ifndef SMALL
static const char license[] =
"\n"
" Redistribution and use in source and binary forms, with or without\n"
" modification, are permitted provided that the following conditions\n"
" are met:\n"
" 1. Redistributions of source code must retain the above copyright\n"
" notice, this list of conditions and the following disclaimer.\n"
" 2. Redistributions in binary form must reproduce the above copyright\n"
" notice, this list of conditions and the following disclaimer in the\n"
" documentation and/or other materials provided with the distribution.\n"
" 3. Neither the name of the University nor the names of its contributors\n"
" may be used to endorse or promote products derived from this software\n"
" without specific prior written permission.\n"
"\n"
" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
" IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,\n"
" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n"
" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR\n"
" SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\n"
" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,\n"
" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING\n"
" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF\n"
" THE POSSIBILITY OF SUCH DAMAGE.\n";
#endif /* SMALL */
#ifndef SMALL
static const char main_rcsid[] = "$OpenBSD: main.c,v 1.75 2009/04/18 18:21:54 naddy Exp $";
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <getopt.h>
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <paths.h>
#include "compress.h"
#define min(a,b) ((a) < (b)? (a) : (b))
int cat, decomp, pipin, force, verbose, testmode, list, recurse, storename;
extern char *__progname;
const struct compressor {
char *name;
char *suffix;
u_char *magic;
void *(*open)(int, const char *, char *, int, u_int32_t, int);
int (*read)(void *, char *, int);
int (*write)(void *, const char *, int);
int (*close)(void *, struct z_info *, const char *, struct stat *);
} c_table[] = {
#define M_DEFLATE (&c_table[0])
{ "deflate", ".gz", "\037\213", gz_open, gz_read, gz_write, gz_close },
#define M_COMPRESS (&c_table[1])
#ifndef SMALL
{ "compress", ".Z", "\037\235", z_open, zread, zwrite, z_close },
#endif /* SMALL */
#if 0
#define M_LZH (&c_table[2])
{ "lzh", ".lzh", "\037\240", lzh_open, lzh_read, lzh_write, lzh_close },
#define M_ZIP (&c_table[3])
{ "zip", ".zip", "PK", zip_open, zip_read, zip_write, zip_close },
#define M_PACK (&c_table[4])
{ "pack", ".pak", "\037\036", pak_open, pak_read, pak_write, pak_close },
#endif
{ NULL }
};
#ifndef SMALL
const struct compressor null_method =
{ "null", ".nul", "XX", null_open, null_read, null_write, null_close };
#endif /* SMALL */
int permission(const char *);
__dead void usage(int);
int docompress(const char *, char *, const struct compressor *,
int, struct stat *);
int dodecompress(const char *, char *, const struct compressor *,
int, struct stat *);
const struct compressor *check_method(int);
const char *check_suffix(const char *);
char *set_outfile(const char *, char *, size_t);
void list_stats(const char *, const struct compressor *, struct z_info *);
void verbose_info(const char *, off_t, off_t, u_int32_t);
const struct option longopts[] = {
#ifndef SMALL
{ "ascii", no_argument, 0, 'a' },
{ "stdout", no_argument, 0, 'c' },
{ "to-stdout", no_argument, 0, 'c' },
{ "decompress", no_argument, 0, 'd' },
{ "uncompress", no_argument, 0, 'd' },
{ "force", no_argument, 0, 'f' },
{ "help", no_argument, 0, 'h' },
{ "list", no_argument, 0, 'l' },
{ "license", no_argument, 0, 'L' },
{ "no-name", no_argument, 0, 'n' },
{ "name", no_argument, 0, 'N' },
{ "quiet", no_argument, 0, 'q' },
{ "recursive", no_argument, 0, 'r' },
{ "suffix", required_argument, 0, 'S' },
{ "test", no_argument, 0, 't' },
{ "verbose", no_argument, 0, 'v' },
{ "version", no_argument, 0, 'V' },
{ "fast", no_argument, 0, '1' },
{ "best", no_argument, 0, '9' },
#endif /* SMALL */
{ NULL }
};
int
main(int argc, char *argv[])
{
FTS *ftsp;
FTSENT *entry;
const struct compressor *method;
const char *s;
char *p, *infile;
char outfile[MAXPATHLEN], _infile[MAXPATHLEN], suffix[16];
char *nargv[512]; /* some estimate based on ARG_MAX */
int bits, ch, error, i, rc, cflag, oflag;
static const char *optstr[3] = {
"123456789ab:cdfghLlNnOo:qrS:tVv",
"cfhlNno:qrtVv",
"fghqr"
};
bits = cflag = oflag = 0;
storename = -1;
p = __progname;
if (p[0] == 'g') {
method = M_DEFLATE;
bits = 6;
p++;
} else
#ifdef SMALL
method = M_DEFLATE;
#else
method = M_COMPRESS;
#endif /* SMALL */
decomp = 0;
pmode = MODE_COMP;
if (!strcmp(p, "zcat")) {
decomp++;
cflag = 1;
pmode = MODE_CAT;
} else {
if (p[0] == 'u' && p[1] == 'n') {
p += 2;
decomp++;
pmode = MODE_DECOMP;
}
if (strcmp(p, "zip") &&
strcmp(p, "compress"))
errx(1, "unknown program name");
}
strlcpy(suffix, method->suffix, sizeof(suffix));
nargv[0] = NULL;
if (method == M_DEFLATE && (p = getenv("GZIP")) != NULL) {
char *last;
nargv[0] = *argv++;
for (i = 1, (p = strtok_r(p, " ", &last)); p != NULL;
(p = strtok_r(NULL, " ", &last)), i++)
if (i < sizeof(nargv)/sizeof(nargv[1]) - argc - 1)
nargv[i] = p;
else
errx(1, "GZIP is too long");
argc += i - 1;
while ((nargv[i++] = *argv++))
;
argv = nargv;
}
while ((ch = getopt_long(argc, argv, optstr[pmode], longopts, NULL)) != -1)
switch(ch) {
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
method = M_DEFLATE;
strlcpy(suffix, method->suffix, sizeof(suffix));
bits = ch - '0';
break;
case 'a':
warnx("option -a is ignored on this system");
break;
case 'b':
bits = strtol(optarg, &p, 10);
/*
* POSIX 1002.3 says 9 <= bits <= 14 for portable
* apps, but says the implementation may allow
* greater.
*/
if (*p)
errx(1, "illegal bit count -- %s", optarg);
break;
case 'c':
cflag = 1;
break;
case 'd': /* Backward compatible. */
decomp++;
break;
case 'f':
force++;
break;
case 'g':
method = M_DEFLATE;
strlcpy(suffix, method->suffix, sizeof(suffix));
bits = 6;
break;
case 'l':
list++;
testmode = 1;
decomp++;
break;
case 'n':
storename = 0;
break;
case 'N':
storename = 1;
break;
#ifndef SMALL
case 'O':
method = M_COMPRESS;
strlcpy(suffix, method->suffix, sizeof(suffix));
break;
#endif /* SMALL */
case 'o':
if (strlcpy(outfile, optarg,
sizeof(outfile)) >= sizeof(outfile))
errx(1, "-o argument is too long");
oflag = 1;
break;
case 'q':
verbose = -1;
break;
case 'S':
p = suffix;
if (optarg[0] != '.')
*p++ = '.';
strlcpy(p, optarg, sizeof(suffix) - (p - suffix));
p = optarg;
break;
case 't':
testmode = 1;
decomp++;
break;
#ifndef SMALL
case 'V':
printf("%s\n%s\n", main_rcsid, gz_rcsid);
printf("%s\n%s\n", z_rcsid, null_rcsid);
#endif
exit (0);
case 'v':
verbose++;
break;
#ifndef SMALL
case 'L':
fputs(copyright, stderr);
fputs(license, stderr);
#endif
exit (0);
case 'r':
recurse++;
break;
case 'h':
usage(0);
break;
default:
usage(1);
}
argc -= optind;
argv += optind;
if (argc == 0) {
if (nargv[0] == NULL)
argv = nargv;
/* XXX - make sure we don't oflow nargv in $GZIP case (millert) */
argv[0] = "-";
argv[1] = NULL;
}
if (oflag && (recurse || argc > 1))
errx(1, "-o option may only be used with a single input file");
if ((cat && argc) + testmode + oflag > 1)
errx(1, "may not mix -o, -c, or -t options");
/*
* By default, when compressing store the original name and timestamp
* in the header. Do not restore these when decompressing unless
* the -N option is given.
*/
if (storename == -1)
storename = !decomp;
if ((ftsp = fts_open(argv, FTS_PHYSICAL|FTS_NOCHDIR, 0)) == NULL)
err(1, NULL);
for (rc = SUCCESS; (entry = fts_read(ftsp)) != NULL;) {
cat = cflag;
pipin = 0;
infile = entry->fts_path;
if (infile[0] == '-' && infile[1] == '\0') {
infile = "stdin";
pipin++;
if (!oflag)
cat = 1;
}
else
switch (entry->fts_info) {
case FTS_D:
if (!recurse) {
warnx("%s is a directory: ignored",
infile);
fts_set(ftsp, entry, FTS_SKIP);
}
continue;
case FTS_DP:
continue;
case FTS_NS:
/*
* If file does not exist and has no suffix,
* tack on the default suffix and try that.
*/
if (entry->fts_errno == ENOENT) {
p = strrchr(entry->fts_accpath, '.');
if ((p == NULL ||
strcmp(p, suffix) != 0) &&
snprintf(_infile, sizeof(_infile),
"%s%s", infile, suffix) <
sizeof(_infile) &&
stat(_infile, entry->fts_statp) ==
0 &&
S_ISREG(entry->fts_statp->st_mode)) {
infile = _infile;
break;
}
}
case FTS_ERR:
case FTS_DNR:
warnx("%s: %s", infile,
strerror(entry->fts_errno));
rc = rc ? rc : WARNING;
continue;
default:
if (!S_ISREG(entry->fts_statp->st_mode) &&
!(S_ISLNK(entry->fts_statp->st_mode) &&
cat)) {
warnx("%s not a regular file%s",
infile, cat ? "" : ": unchanged");
rc = rc ? rc : WARNING;
continue;
}
break;
}
if (!decomp && !pipin && (s = check_suffix(infile)) != NULL) {
warnx("%s already has %s suffix -- unchanged",
infile, s);
rc = rc ? rc : WARNING;
continue;
}
if (!oflag) {
if (cat)
strlcpy(outfile, "stdout", sizeof(outfile));
else if (decomp) {
if (set_outfile(infile, outfile,
sizeof outfile) == NULL) {
if (!recurse) {
warnx("%s: unknown suffix: "
"ignored", infile);
rc = rc ? rc : WARNING;
}
continue;
}
} else {
if (snprintf(outfile, sizeof(outfile),
"%s%s", infile, suffix) >= sizeof(outfile)) {
warnx("%s%s: name too long",
infile, suffix);
rc = rc ? rc : WARNING;
continue;
}
}
}
if (verbose > 0 && !pipin && !list)
fprintf(stderr, "%s:\t", infile);
error = (decomp ? dodecompress : docompress)
(infile, outfile, method, bits, entry->fts_statp);
switch (error) {
case SUCCESS:
if (!cat && !testmode) {
if (!pipin && unlink(infile) && verbose >= 0)
warn("input: %s", infile);
}
break;
case WARNING:
rc = rc ? rc : WARNING;
break;
default:
rc = FAILURE;
break;
}
}
if (list)
list_stats(NULL, NULL, NULL);
exit(rc);
}
int
docompress(const char *in, char *out, const struct compressor *method,
int bits, struct stat *sb)
{
#ifndef SMALL
u_char buf[Z_BUFSIZE];
char *name;
int error, ifd, ofd, flags, oreg;
void *cookie;
ssize_t nr;
u_int32_t mtime;
struct z_info info;
struct stat osb;
mtime = 0;
flags = oreg = 0;
error = SUCCESS;
name = NULL;
cookie = NULL;
if (pipin)
ifd = dup(STDIN_FILENO);
else
ifd = open(in, O_RDONLY);
if (ifd < 0) {
if (verbose >= 0)
warn("%s", in);
return (FAILURE);
}
if (cat)
ofd = dup(STDOUT_FILENO);
else {
if (stat(out, &osb) == 0) {
oreg = S_ISREG(osb.st_mode);
if (!force && oreg && !permission(out)) {
(void) close(ifd);
return (WARNING);
}
}
ofd = open(out, O_WRONLY|O_CREAT, S_IWUSR);
}
if (ofd < 0) {
if (verbose >= 0)
warn("%s", out);
(void) close(ifd);
return (FAILURE);
}
if (method != M_COMPRESS && !force && isatty(ofd)) {
if (verbose >= 0)
warnx("%s: won't write compressed data to terminal",
out);
(void) close(ofd);
(void) close(ifd);
return (FAILURE);
}
if (!pipin && storename) {
name = basename(in);
mtime = (u_int32_t)sb->st_mtime;
}
if ((cookie = (*method->open)(ofd, "w", name, bits, mtime, flags)) == NULL) {
if (verbose >= 0)
warn("%s", out);
if (oreg)
(void) unlink(out);
(void) close(ofd);
(void) close(ifd);
return (FAILURE);
}
while ((nr = read(ifd, buf, sizeof(buf))) > 0)
if ((method->write)(cookie, buf, nr) != nr) {
if (verbose >= 0)
warn("%s", out);
error = FAILURE;
break;
}
if (!error && nr < 0) {
if (verbose >= 0)
warn("%s", in);
error = FAILURE;
}
if ((method->close)(cookie, &info, out, sb)) {
if (!error && verbose >= 0)
warn("%s", out);
error = FAILURE;
}
if (close(ifd)) {
if (!error && verbose >= 0)
warn("%s", in);
error = FAILURE;
}
if (!force && info.total_out >= info.total_in) {
if (verbose > 0)
fprintf(stderr, "file would grow; left unmodified\n");
(void) unlink(out);
error = WARNING;
}
if (error) {
if (oreg)
(void) unlink(out);
} else if (verbose > 0)
verbose_info(out, info.total_out, info.total_in, info.hlen);
return (error);
#else
warnx("compression not supported");
return (FAILURE);
#endif
}
const struct compressor *
check_method(int fd)
{
const struct compressor *method;
u_char magic[2];
if (read(fd, magic, sizeof(magic)) != 2)
return (NULL);
for (method = &c_table[0]; method->name != NULL; method++) {
if (magic[0] == method->magic[0] &&
magic[1] == method->magic[1])
return (method);
}
#ifndef SMALL
if (force && cat) {
null_magic[0] = magic[0];
null_magic[1] = magic[1];
return (&null_method);
}
#endif /* SMALL */
return (NULL);
}
int
dodecompress(const char *in, char *out, const struct compressor *method,
int bits, struct stat *sb)
{
u_char buf[Z_BUFSIZE];
char oldname[MAXPATHLEN];
int error, oreg, ifd, ofd;
void *cookie;
ssize_t nr;
struct z_info info;
struct stat osb;
oreg = 0;
error = SUCCESS;
cookie = NULL;
if (pipin)
ifd = dup(STDIN_FILENO);
else
ifd = open(in, O_RDONLY);
if (ifd < 0) {
if (verbose >= 0)
warn("%s", in);
return -1;
}
if (!force && isatty(ifd)) {
if (verbose >= 0)
warnx("%s: won't read compressed data from terminal",
in);
close (ifd);
return -1;
}
if ((method = check_method(ifd)) == NULL) {
if (verbose >= 0)
warnx("%s: unrecognized file format", in);
close (ifd);
return -1;
}
/* XXX - open constrains outfile to MAXPATHLEN so this is safe */
oldname[0] = '\0';
if ((cookie = (*method->open)(ifd, "r", oldname, bits, 0, 1)) == NULL) {
if (verbose >= 0)
warn("%s", in);
close (ifd);
return (FAILURE);
}
if (storename && oldname[0] != '\0') {
char *cp = strrchr(out, '/');
if (cp != NULL) {
*(cp + 1) = '\0';
strlcat(out, oldname, MAXPATHLEN);
} else
strlcpy(out, oldname, MAXPATHLEN);
cat = 0; /* XXX should -c override? */
}
if (testmode)
ofd = -1;
else {
if (cat)
ofd = dup(STDOUT_FILENO);
else {
if (stat(out, &osb) == 0) {
oreg = S_ISREG(osb.st_mode);
if (!force && oreg && !permission(out)) {
(void) close(ifd);
return (WARNING);
}
}
ofd = open(out, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR);
}
if (ofd < 0) {
if (verbose >= 0)
warn("%s", in);
(method->close)(cookie, NULL, NULL, NULL);
return (FAILURE);
}
}
while ((nr = (method->read)(cookie, buf, sizeof(buf))) > 0) {
if (ofd != -1 && write(ofd, buf, nr) != nr) {
if (verbose >= 0)
warn("%s", out);
error = FAILURE;
break;
}
}
if (!error && nr < 0) {
if (verbose >= 0)
warnx("%s: %s", in,
errno == EINVAL ? "crc error" : strerror(errno));
error = errno == EINVAL ? WARNING : FAILURE;
}
if ((method->close)(cookie, &info, NULL, NULL)) {
if (!error && verbose >= 0)
warnx("%s", in);
error = FAILURE;
}
if (storename && !cat) {
if (info.mtime != 0) {
sb->st_mtimespec.tv_sec =
sb->st_atimespec.tv_sec = info.mtime;
sb->st_mtimespec.tv_nsec =
sb->st_atimespec.tv_nsec = 0;
} else
storename = 0; /* no timestamp to restore */
}
if (error == SUCCESS)
setfile(out, ofd, sb);
if (ofd != -1 && close(ofd)) {
if (!error && verbose >= 0)
warn("%s", out);
error = FAILURE;
}
if (!error) {
if (list) {
if (info.mtime == 0)
info.mtime = (u_int32_t)sb->st_mtime;
list_stats(out, method, &info);
} else if (verbose > 0) {
verbose_info(out, info.total_in, info.total_out,
info.hlen);
}
}
/* On error, clean up the file we created but preserve errno. */
if (error && oreg)
unlink(out);
return (error);
}
void
setfile(const char *name, int fd, struct stat *fs)
{
struct timeval tv[2];
if (name == NULL || cat || testmode)
return;
/*
* If input was a pipe we don't have any info to restore but we
* must set the mode since the current mode on the file is 0200.
*/
if (pipin) {
mode_t mask = umask(022);
fchmod(fd, DEFFILEMODE & ~mask);
umask(mask);
return;
}
/*
* Changing the ownership probably won't succeed, unless we're root
* or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
* the mode; current BSD behavior is to remove all setuid bits on
* chown. If chown fails, lose setuid/setgid bits.
*/
fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
if (fchown(fd, fs->st_uid, fs->st_gid)) {
if (errno != EPERM)
warn("fchown: %s", name);
fs->st_mode &= ~(S_ISUID|S_ISGID);
}
if (fchmod(fd, fs->st_mode))
warn("fchmod: %s", name);
if (fs->st_flags && fchflags(fd, fs->st_flags))
warn("fchflags: %s", name);
TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
if (futimes(fd, tv))
warn("futimes: %s", name);
}
int
permission(const char *fname)
{
int ch, first;
if (!isatty(fileno(stderr)))
return (0);
(void)fprintf(stderr, "overwrite %s? ", fname);
first = ch = getchar();
while (ch != '\n' && ch != EOF)
ch = getchar();
return (first == 'y');
}
/*
* Check infile for a known suffix and return the suffix portion or NULL.
*/
const char *
check_suffix(const char *infile)
{
int i;
char *suf, *sep, *separators = ".-_";
static char *suffixes[] = { "Z", "gz", "z", "tgz", "taz", NULL };
for (sep = separators; *sep != '\0'; sep++) {
if ((suf = strrchr(infile, *sep)) == NULL)
continue;
suf++;
for (i = 0; suffixes[i] != NULL; i++) {
if (strcmp(suf, suffixes[i]) == 0)
return (suf - 1);
}
}
return (NULL);
}
/*
* Set outfile based on the suffix. In most cases we just strip
* off the suffix but things like .tgz and .taz are special.
*/
char *
set_outfile(const char *infile, char *outfile, size_t osize)
{
const char *s;
char *cp;
if ((s = check_suffix(infile)) == NULL)
return (NULL);
(void)strlcpy(outfile, infile, osize);
cp = outfile + (s - infile) + 1;
/*
* Convert tgz and taz -> tar, else drop the suffix.
*/
if (strcmp(cp, "tgz") == 0) {
cp[1] = 'a';
cp[2] = 'r';
} else if (strcmp(cp, "taz") == 0)
cp[2] = 'r';
else
cp[-1] = '\0';
return (outfile);
}
/*
* Print output for the -l option.
*/
void
list_stats(const char *name, const struct compressor *method,
struct z_info *info)
{
static off_t compressed_total, uncompressed_total, header_total;
static u_int nruns;
char *timestr;
if (nruns == 0) {
if (verbose >= 0) {
if (verbose > 0)
fputs("method crc date time ", stdout);
puts("compressed uncompressed ratio uncompressed_name");
}
}
nruns++;
if (name != NULL) {
if (verbose > 0) {
timestr = ctime(&info->mtime) + 4;
timestr[12] = '\0';
if (timestr[4] == ' ')
timestr[4] = '0';
printf("%-7.7s %08x %s ", method->name, info->crc,
timestr);
}
printf("%10lld %10lld %4.1f%% %s\n",
(long long)(info->total_in + info->hlen),
(long long)info->total_out,
((long long)info->total_out - (long long)info->total_in) *
100.0 / info->total_out, name);
compressed_total += info->total_in;
uncompressed_total += info->total_out;
header_total += info->hlen;
} else if (verbose >= 0) {
if (nruns < 3) /* only do totals for > 1 files */
return;
if (verbose > 0)
fputs(" ", stdout);
printf("%10lld %10lld %4.1f%% (totals)\n",
(long long)(compressed_total + header_total),
(long long)uncompressed_total,
(uncompressed_total - compressed_total) *
100.0 / uncompressed_total);
}
}
void
verbose_info(const char *file, off_t compressed, off_t uncompressed,
u_int32_t hlen)
{
if (testmode) {
fputs("OK\n", stderr);
return;
}
if (!pipin) {
fprintf(stderr, "\t%4.1f%% -- replaced with %s\n",
(uncompressed - compressed) * 100.0 / uncompressed, file);
}
compressed += hlen;
fprintf(stderr, "%lld bytes in, %lld bytes out\n",
(long long)(decomp ? compressed : uncompressed),
(long long)(decomp ? uncompressed : compressed));
}
__dead void
usage(int status)
{
switch (pmode) {
case MODE_COMP:
fprintf(stderr, "usage: %s [-123456789cdfghLlNnOqrtVv] "
"[-b bits] [-o filename] [-S suffix]\n"
" %*s [file ...]\n",
__progname, (int)strlen(__progname), "");
break;
case MODE_DECOMP:
fprintf(stderr, "usage: %s [-cfhlNnqrtVv] [-o filename] "
"[file ...]\n", __progname);
break;
case MODE_CAT:
fprintf(stderr, "usage: %s [-fghqr] [file ...]\n", __progname);
break;
}
exit(status);
}