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freebsd-nq/usr.bin/tar/bsdtar.c
Tim Kientzle dfee4c496f Linux port corrections: 
* Add a more reasonable default device for linux
   * Add an autoconf check for the FNM_LEADING_DIR extension
     (which isn't yet obeyed in the code)
2004-08-07 17:17:11 +00:00

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/*-
* Copyright (c) 2003-2004 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "bsdtar_platform.h"
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stat.h>
#include <archive.h>
#include <archive_entry.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#ifdef HAVE_GETOPT_LONG
#include <getopt.h>
#else
struct option {
const char *name;
int has_arg;
int *flag;
int val;
};
#define no_argument 0
#define required_argument 1
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#include <locale.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#if HAVE_ZLIB_H
#include <zlib.h>
#endif
#include "bsdtar.h"
#ifdef linux
#define _PATH_DEFTAPE "/dev/st0"
#endif
#ifndef _PATH_DEFTAPE
#define _PATH_DEFTAPE "/dev/tape"
#endif
static int bsdtar_getopt(struct bsdtar *, const char *optstring,
const struct option **poption);
static void long_help(struct bsdtar *);
static void only_mode(struct bsdtar *, char mode, const char *opt,
const char *valid);
static char ** rewrite_argv(struct bsdtar *,
int *argc, char ** src_argv,
const char *optstring);
static void version(void);
/*
* The leading '+' here forces the GNU version of getopt() (as well as
* both the GNU and BSD versions of getopt_long) to stop at the first
* non-option. Otherwise, GNU getopt() permutes the arguments and
* screws up -C processing.
*/
static const char *tar_opts = "+Bb:C:cF:f:HhjkLlmnOoPprtT:UuvW:wX:xyZz";
/*
* Most of these long options are deliberately not documented. They
* are provided only to make life easier for people who also use GNU tar.
* The only long options documented in the manual page are the ones
* with no corresponding short option, such as --exclude, --nodump,
* and --fast-read.
*
* On systems that lack getopt_long, long options can be specified
* using -W longopt and -W longopt=value, e.g. "-W nodump" is the same
* as "--nodump" and "-W exclude=pattern" is the same as "--exclude
* pattern". This does not rely the GNU getopt() "W;" extension, so
* should work correctly on any system with a POSIX-compliant getopt().
*/
/* Fake short equivalents for long options that otherwise lack them. */
#define OPTION_CHECK_LINKS 3
#define OPTION_EXCLUDE 6
#define OPTION_FAST_READ 9
#define OPTION_HELP 12
#define OPTION_INCLUDE 15
#define OPTION_NODUMP 18
#define OPTION_NO_SAME_PERMISSIONS 21
#define OPTION_NULL 24
#define OPTION_ONE_FILE_SYSTEM 27
#define OPTION_VERSION 30
static const struct option tar_longopts[] = {
{ "absolute-paths", no_argument, NULL, 'P' },
{ "append", no_argument, NULL, 'r' },
{ "block-size", required_argument, NULL, 'b' },
{ "bunzip2", no_argument, NULL, 'j' },
{ "bzip", no_argument, NULL, 'j' },
{ "bzip2", no_argument, NULL, 'j' },
{ "cd", required_argument, NULL, 'C' },
{ "check-links", no_argument, NULL, OPTION_CHECK_LINKS },
{ "confirmation", no_argument, NULL, 'w' },
{ "create", no_argument, NULL, 'c' },
{ "dereference", no_argument, NULL, 'L' },
{ "directory", required_argument, NULL, 'C' },
{ "exclude", required_argument, NULL, OPTION_EXCLUDE },
{ "exclude-from", required_argument, NULL, 'X' },
{ "extract", no_argument, NULL, 'x' },
{ "fast-read", no_argument, NULL, OPTION_FAST_READ },
{ "file", required_argument, NULL, 'f' },
{ "format", required_argument, NULL, 'F' },
{ "gunzip", no_argument, NULL, 'z' },
{ "gzip", no_argument, NULL, 'z' },
{ "help", no_argument, NULL, OPTION_HELP },
{ "include", required_argument, NULL, OPTION_INCLUDE },
{ "interactive", no_argument, NULL, 'w' },
{ "keep-old-files", no_argument, NULL, 'k' },
{ "list", no_argument, NULL, 't' },
{ "modification-time", no_argument, NULL, 'm' },
{ "nodump", no_argument, NULL, OPTION_NODUMP },
{ "norecurse", no_argument, NULL, 'n' },
{ "no-recursion", no_argument, NULL, 'n' },
{ "no-same-owner", no_argument, NULL, 'o' },
{ "no-same-permissions",no_argument, NULL, OPTION_NO_SAME_PERMISSIONS },
{ "null", no_argument, NULL, OPTION_NULL },
{ "one-file-system", no_argument, NULL, OPTION_ONE_FILE_SYSTEM },
{ "preserve-permissions", no_argument, NULL, 'p' },
{ "read-full-blocks", no_argument, NULL, 'B' },
{ "same-permissions", no_argument, NULL, 'p' },
{ "to-stdout", no_argument, NULL, 'O' },
{ "unlink", no_argument, NULL, 'U' },
{ "unlink-first", no_argument, NULL, 'U' },
{ "update", no_argument, NULL, 'u' },
{ "verbose", no_argument, NULL, 'v' },
{ "version", no_argument, NULL, OPTION_VERSION },
{ NULL, 0, NULL, 0 }
};
int
main(int argc, char **argv)
{
struct bsdtar *bsdtar, bsdtar_storage;
const struct option *option;
int opt, t;
char mode;
char option_o;
char possible_help_request;
char buff[16];
/*
* Use a pointer for consistency, but stack-allocated storage
* for ease of cleanup.
*/
bsdtar = &bsdtar_storage;
memset(bsdtar, 0, sizeof(*bsdtar));
bsdtar->fd = -1; /* Mark as "unused" */
option_o = 0;
if (setlocale(LC_ALL, "") == NULL)
bsdtar_warnc(bsdtar, 0, "Failed to set default locale");
#if defined(HAVE_NL_LANGINFO) && defined(HAVE_D_MD_ORDER)
bsdtar->day_first = (*nl_langinfo(D_MD_ORDER) == 'd');
#endif
mode = '\0';
possible_help_request = 0;
/* Look up uid of current user for future reference */
bsdtar->user_uid = geteuid();
/* Default: open tape drive. */
bsdtar->filename = getenv("TAPE");
if (bsdtar->filename == NULL)
bsdtar->filename = _PATH_DEFTAPE;
/* Default: preserve mod time on extract */
bsdtar->extract_flags = ARCHIVE_EXTRACT_TIME;
if (bsdtar->user_uid == 0)
bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
if (*argv == NULL)
bsdtar->progname = "bsdtar";
else {
bsdtar->progname = strrchr(*argv, '/');
if (bsdtar->progname != NULL)
bsdtar->progname++;
else
bsdtar->progname = *argv;
}
/* Rewrite traditional-style tar arguments, if used. */
argv = rewrite_argv(bsdtar, &argc, argv, tar_opts);
bsdtar->argv = argv;
bsdtar->argc = argc;
/* Process all remaining arguments now. */
while ((opt = bsdtar_getopt(bsdtar, tar_opts, &option)) != -1) {
switch (opt) {
case 'B': /* GNU tar */
/* libarchive doesn't need this; just ignore it. */
break;
case 'b': /* SUSv2 */
t = atoi(optarg);
if (t <= 0 || t > 1024)
bsdtar_errc(bsdtar, 1, 0,
"Argument to -b is out of range (1..1024)");
bsdtar->bytes_per_block = 512 * t;
break;
case 'C': /* GNU tar */
/* Defer first -C until after -f is opened. */
bsdtar->start_dir = optarg;
break;
case 'c': /* SUSv2 */
if (mode != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c",
opt, mode);
mode = opt;
break;
case OPTION_CHECK_LINKS: /* GNU tar */
bsdtar->option_warn_links = 1;
break;
case OPTION_EXCLUDE: /* GNU tar */
if (exclude(bsdtar, optarg))
bsdtar_errc(bsdtar, 1, 0,
"Couldn't exclude %s\n", optarg);
break;
case 'F':
bsdtar->create_format = optarg;
break;
case 'f': /* SUSv2 */
bsdtar->filename = optarg;
if (strcmp(bsdtar->filename, "-") == 0)
bsdtar->filename = NULL;
break;
case OPTION_FAST_READ: /* GNU tar */
bsdtar->option_fast_read = 1;
break;
case 'H': /* BSD convention */
bsdtar->symlink_mode = 'H';
break;
case 'h': /* Linux Standards Base, gtar; synonym for -L */
bsdtar->symlink_mode = 'L';
/* Hack: -h by itself is the "help" command. */
possible_help_request = 1;
break;
case OPTION_HELP:
long_help(bsdtar);
exit(0);
break;
case OPTION_INCLUDE:
if (include(bsdtar, optarg))
bsdtar_errc(bsdtar, 1, 0,
"Failed to add %s to inclusion list",
optarg);
break;
case 'j': /* GNU tar */
#if HAVE_LIBBZ2
if (bsdtar->create_compression != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c", opt,
bsdtar->create_compression);
bsdtar->create_compression = opt;
#else
bsdtar_warnc(bsdtar, 0, "-j compression not supported by this version of bsdtar");
usage(bsdtar);
#endif
break;
case 'k': /* GNU tar */
bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE;
break;
case 'L': /* BSD convention */
bsdtar->symlink_mode = 'L';
break;
case 'l': /* SUSv2 and GNU conflict badly here */
if (getenv("POSIXLY_CORRECT") != NULL) {
/* User has asked for POSIX/SUS behavior. */
bsdtar->option_warn_links = 1;
} else {
fprintf(stderr,
"Error: -l has different behaviors in different tar programs.\n");
fprintf(stderr,
" For the GNU behavior, use --one-file-system instead.\n");
fprintf(stderr,
" For the POSIX behavior, use --check-links instead.\n");
usage(bsdtar);
}
break;
case 'm': /* SUSv2 */
bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_TIME;
break;
case 'n': /* GNU tar */
bsdtar->option_no_subdirs = 1;
break;
case OPTION_NODUMP: /* star */
bsdtar->option_honor_nodump = 1;
break;
case OPTION_NO_SAME_PERMISSIONS: /* GNU tar */
/*
* This is always the default in FreeBSD's
* version of GNU tar; it's also the default
* behavior for bsdtar, so treat the
* command-line option as a no-op.
*/
break;
case OPTION_NULL: /* GNU tar */
bsdtar->option_null++;
break;
case 'O': /* GNU tar */
bsdtar->option_stdout = 1;
break;
case 'o': /* SUSv2 and GNU conflict here */
option_o = 1; /* Record it and resolve it later. */
break;
case OPTION_ONE_FILE_SYSTEM: /* -l in GNU tar */
bsdtar->option_dont_traverse_mounts = 1;
break;
#if 0
/*
* The common BSD -P option is not necessary, since
* our default is to archive symlinks, not follow
* them. This is convenient, as -P conflicts with GNU
* tar anyway.
*/
case 'P': /* BSD convention */
/* Default behavior, no option necessary. */
break;
#endif
case 'P': /* GNU tar */
bsdtar->option_absolute_paths = 1;
break;
case 'p': /* GNU tar, star */
bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
break;
case 'r': /* SUSv2 */
if (mode != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c",
opt, mode);
mode = opt;
break;
case 'T': /* GNU tar */
bsdtar->names_from_file = optarg;
break;
case 't': /* SUSv2 */
if (mode != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c",
opt, mode);
mode = opt;
bsdtar->verbose++;
break;
case 'U': /* GNU tar */
bsdtar->extract_flags |= ARCHIVE_EXTRACT_UNLINK;
bsdtar->option_unlink_first = 1;
break;
case 'u': /* SUSv2 */
if (mode != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c",
opt, mode);
mode = opt;
break;
case 'v': /* SUSv2 */
bsdtar->verbose++;
break;
case OPTION_VERSION:
version();
break;
case 'w': /* SUSv2 */
bsdtar->option_interactive = 1;
break;
case 'X': /* GNU tar */
if (exclude_from_file(bsdtar, optarg))
bsdtar_errc(bsdtar, 1, 0,
"failed to process exclusions from file %s",
optarg);
break;
case 'x': /* SUSv2 */
if (mode != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c",
opt, mode);
mode = opt;
break;
case 'y': /* FreeBSD version of GNU tar */
#if HAVE_LIBBZ2
if (bsdtar->create_compression != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c", opt,
bsdtar->create_compression);
bsdtar->create_compression = opt;
#else
bsdtar_warnc(bsdtar, 0, "-y compression not supported by this version of bsdtar");
usage(bsdtar);
#endif
break;
case 'Z': /* GNU tar */
if (bsdtar->create_compression != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c", opt,
bsdtar->create_compression);
bsdtar->create_compression = opt;
break;
case 'z': /* GNU tar, star, many others */
#if HAVE_LIBZ
if (bsdtar->create_compression != '\0')
bsdtar_errc(bsdtar, 1, 0,
"Can't specify both -%c and -%c", opt,
bsdtar->create_compression);
bsdtar->create_compression = opt;
#else
bsdtar_warnc(bsdtar, 0, "-z compression not supported by this version of bsdtar");
usage(bsdtar);
#endif
break;
default:
bsdtar_warnc(bsdtar, 0, "Unrecognized option -c", optopt);
usage(bsdtar);
}
}
/*
* Sanity-check options.
*/
if ((mode == '\0') && possible_help_request) {
long_help(bsdtar);
exit(0);
}
if (mode == '\0')
bsdtar_errc(bsdtar, 1, 0,
"Must specify one of -c, -r, -t, -u, -x");
/* Check boolean options only permitted in certain modes. */
if (bsdtar->option_absolute_paths)
only_mode(bsdtar, mode, "-P", "xcru");
if (bsdtar->option_dont_traverse_mounts)
only_mode(bsdtar, mode, "-X", "cru");
if (bsdtar->option_fast_read)
only_mode(bsdtar, mode, "--fast-read", "xt");
if (bsdtar->option_honor_nodump)
only_mode(bsdtar, mode, "--nodump", "cru");
if (option_o > 0) {
switch (mode) {
case 'c':
/*
* In GNU tar, -o means "old format." The
* "ustar" format is the closest thing
* supported by libarchive.
*/
bsdtar->create_format = "ustar";
/* TODO: bsdtar->create_format = "v7"; */
break;
case 'x':
/* POSIX-compatible behavior. */
bsdtar->option_no_owner = 1;
bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
break;
default:
only_mode(bsdtar, mode, "-o", "xc");
break;
}
}
if (bsdtar->option_no_subdirs)
only_mode(bsdtar, mode, "-n", "cru");
if (bsdtar->option_stdout)
only_mode(bsdtar, mode, "-O", "x");
if (bsdtar->option_warn_links)
only_mode(bsdtar, mode, "--check-links", "cr");
/* Check other parameters only permitted in certain modes. */
if (bsdtar->create_compression == 'Z' && mode == 'c') {
bsdtar_warnc(bsdtar, 0, ".Z compression not supported");
usage(bsdtar);
}
if (bsdtar->create_compression != '\0') {
strcpy(buff, "-?");
buff[1] = bsdtar->create_compression;
only_mode(bsdtar, mode, buff, "cxt");
}
if (bsdtar->create_format != NULL)
only_mode(bsdtar, mode, "-F", "c");
if (bsdtar->symlink_mode != '\0') {
strcpy(buff, "-?");
buff[1] = bsdtar->symlink_mode;
only_mode(bsdtar, mode, buff, "cru");
}
bsdtar->argc -= optind;
bsdtar->argv += optind;
switch(mode) {
case 'c':
tar_mode_c(bsdtar);
break;
case 'r':
tar_mode_r(bsdtar);
break;
case 't':
tar_mode_t(bsdtar);
break;
case 'u':
tar_mode_u(bsdtar);
break;
case 'x':
tar_mode_x(bsdtar);
break;
}
cleanup_exclusions(bsdtar);
return (bsdtar->return_value);
}
/*
* Verify that the mode is correct.
*/
static void
only_mode(struct bsdtar *bsdtar, char mode,
const char *opt, const char *valid_modes)
{
if (strchr(valid_modes, mode) == NULL)
bsdtar_errc(bsdtar, 1, 0,
"Option %s is not permitted in mode -%c",
opt, mode);
}
/*-
* Convert traditional tar arguments into new-style.
* For example,
* tar tvfb file.tar 32 --exclude FOO
* will be converted to
* tar -t -v -f file.tar -b 32 --exclude FOO
*
* This requires building a new argv array. The initial bundled word
* gets expanded into a new string that looks like "-t\0-v\0-f\0-b\0".
* The new argv array has pointers into this string intermingled with
* pointers to the existing arguments. Arguments are moved to
* immediately follow their options.
*
* The optstring argument here is the same one passed to getopt(3).
* It is used to determine which option letters have trailing arguments.
*/
char **
rewrite_argv(struct bsdtar *bsdtar, int *argc, char **src_argv,
const char *optstring)
{
char **new_argv, **dest_argv;
const char *p;
char *src, *dest;
if (src_argv[0] == NULL ||
src_argv[1] == NULL || src_argv[1][0] == '-')
return (src_argv);
*argc += strlen(src_argv[1]) - 1;
new_argv = malloc((*argc + 1) * sizeof(new_argv[0]));
if (new_argv == NULL)
bsdtar_errc(bsdtar, 1, errno, "No Memory");
dest_argv = new_argv;
*dest_argv++ = *src_argv++;
dest = malloc(strlen(*src_argv) * 3);
if (dest == NULL)
bsdtar_errc(bsdtar, 1, errno, "No memory");
for (src = *src_argv++; *src != '\0'; src++) {
*dest_argv++ = dest;
*dest++ = '-';
*dest++ = *src;
*dest++ = '\0';
/* If option takes an argument, insert that into the list. */
for (p = optstring; p != NULL && *p != '\0'; p++) {
if (*p != *src)
continue;
if (p[1] != ':') /* No arg required, done. */
break;
if (*src_argv == NULL) /* No arg available? Error. */
bsdtar_errc(bsdtar, 1, 0,
"Option %c requires an argument",
*src);
*dest_argv++ = *src_argv++;
break;
}
}
/* Copy remaining arguments, including trailing NULL. */
while ((*dest_argv++ = *src_argv++) != NULL)
;
return (new_argv);
}
void
usage(struct bsdtar *bsdtar)
{
const char *p;
p = bsdtar->progname;
fprintf(stderr, "Usage:\n");
fprintf(stderr, " List: %s -tf <archive-filename>\n", p);
fprintf(stderr, " Extract: %s -xf <archive-filename>\n", p);
fprintf(stderr, " Create: %s -cf <archive-filename> [filenames...]\n", p);
#ifdef HAVE_GETOPT_LONG
fprintf(stderr, " Help: %s --help\n", p);
#else
fprintf(stderr, " Help: %s -h\n", p);
#endif
exit(1);
}
static void
version(void)
{
printf("bsdtar %s, ", PACKAGE_VERSION);
printf("%s\n", archive_version());
printf("Copyright (C) 2003-2004 Tim Kientzle\n");
exit(1);
}
static const char *long_help_msg =
"First option must be a mode specifier:\n"
" -c Create -r Add/Replace -t List -u Update -x Extract\n"
"Common Options:\n"
" -b # Use # 512-byte records per I/O block\n"
" -f <filename> Location of archive (default " _PATH_DEFTAPE ")\n"
" -v Verbose\n"
" -w Interactive\n"
"Create: %p -c [options] [<file> | <dir> | @<archive> | C=<dir> ]\n"
" <file>, <dir> add these items to archive\n"
" -z, -j Compress archive with gzip/bzip2\n"
" -F {ustar|pax|cpio|shar} Select archive format\n"
#ifdef HAVE_GETOPT_LONG
" --exclude <pattern> Skip files that match pattern\n"
#else
" -W exclude=<pattern> Skip files that match pattern\n"
#endif
" C=<dir> Change to <dir> before processing remaining files\n"
" @<archive> Add entries from <archive> to output\n"
"List: %p -t [options] [<patterns>]\n"
" <patterns> If specified, list only entries that match\n"
"Extract: %p -x [options] [<patterns>]\n"
" <patterns> If specified, extract only entries that match\n"
" -k Keep (don't overwrite) existing files\n"
" -m Don't restore modification times\n"
" -O Write entries to stdout, don't restore to disk\n"
" -p Restore permissions (including ACLs, owner, file flags)\n";
/*
* Note that the word 'bsdtar' will always appear in the first line
* of output.
*
* In particular, /bin/sh scripts that need to test for the presence
* of bsdtar can use the following template:
*
* if (tar --help 2>&1 | grep bsdtar >/dev/null 2>&1 ) then \
* echo bsdtar; else echo not bsdtar; fi
*/
static void
long_help(struct bsdtar *bsdtar)
{
const char *prog;
const char *p;
prog = bsdtar->progname;
fflush(stderr);
p = (strcmp(prog,"bsdtar") != 0) ? "(bsdtar)" : "";
printf("%s%s: manipulate archive files\n", prog, p);
for (p = long_help_msg; *p != '\0'; p++) {
if (*p == '%') {
if (p[1] == 'p') {
fputs(prog, stdout);
p++;
} else
putchar('%');
} else
putchar(*p);
}
fprintf(stdout, "\n%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
fprintf(stdout, "%s\n", archive_version());
}
static int
bsdtar_getopt(struct bsdtar *bsdtar, const char *optstring,
const struct option **poption)
{
char *p, *q;
const struct option *option;
int opt;
int option_index;
size_t option_length;
option_index = -1;
*poption = NULL;
#ifdef HAVE_GETOPT_LONG
opt = getopt_long(bsdtar->argc, bsdtar->argv, optstring,
tar_longopts, &option_index);
if (option_index > -1)
*poption = tar_longopts + option_index;
#else
opt = getopt(bsdtar->argc, bsdtar->argv, optstring);
#endif
/* Support long options through -W longopt=value */
if (opt == 'W') {
p = optarg;
q = strchr(optarg, '=');
if (q != NULL) {
option_length = (size_t)(q - p);
optarg = q + 1;
} else {
option_length = strlen(p);
optarg = NULL;
}
option = tar_longopts;
while (option->name != NULL &&
(strlen(option->name) < option_length ||
strncmp(p, option->name, option_length) != 0 )) {
option++;
}
if (option->name != NULL) {
*poption = option;
opt = option->val;
/* Check if there's another match. */
option++;
while (option->name != NULL &&
(strlen(option->name) < option_length ||
strncmp(p, option->name, option_length) != 0)) {
option++;
}
if (option->name != NULL)
bsdtar_errc(bsdtar, 1, 0,
"Ambiguous option %s "
"(matches both %s and %s)",
p, (*poption)->name, option->name);
} else {
opt = '?';
/* TODO: Set up a fake 'struct option' for
* error reporting... ? ? ? */
}
}
return (opt);
}
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