/*- * Copyright (c) 2003-2008 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. * 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. */ /* * Command line parser for tar. */ #include "bsdtar_platform.h" __FBSDID("$FreeBSD$"); #ifdef HAVE_ERRNO_H #include #endif #ifdef HAVE_STDLIB_H #include #endif #ifdef HAVE_STRING_H #include #endif #include "bsdtar.h" #include "err.h" /* * Short options for tar. Please keep this sorted. */ static const char *short_options = "Bb:C:cf:HhI:JjkLlmnOoPpqrSs:T:tUuvW:wX:xyZz"; /* * Long options for tar. Please keep this list sorted. * * The symbolic names for options that lack a short equivalent are * defined in bsdtar.h. Also note that so far I've found no need * to support optional arguments to long options. That would be * a small change to the code below. */ static struct option { const char *name; int required; /* 1 if this option requires an argument. */ int equivalent; /* Equivalent short option. */ } tar_longopts[] = { { "absolute-paths", 0, 'P' }, { "append", 0, 'r' }, { "block-size", 1, 'b' }, { "bunzip2", 0, 'j' }, { "bzip", 0, 'j' }, { "bzip2", 0, 'j' }, { "cd", 1, 'C' }, { "check-links", 0, OPTION_CHECK_LINKS }, { "chroot", 0, OPTION_CHROOT }, { "compress", 0, 'Z' }, { "confirmation", 0, 'w' }, { "create", 0, 'c' }, { "dereference", 0, 'L' }, { "directory", 1, 'C' }, { "exclude", 1, OPTION_EXCLUDE }, { "exclude-from", 1, 'X' }, { "extract", 0, 'x' }, { "fast-read", 0, 'q' }, { "file", 1, 'f' }, { "files-from", 1, 'T' }, { "format", 1, OPTION_FORMAT }, { "options", 1, OPTION_OPTIONS }, { "gunzip", 0, 'z' }, { "gzip", 0, 'z' }, { "help", 0, OPTION_HELP }, { "include", 1, OPTION_INCLUDE }, { "interactive", 0, 'w' }, { "insecure", 0, 'P' }, { "keep-newer-files", 0, OPTION_KEEP_NEWER_FILES }, { "keep-old-files", 0, 'k' }, { "list", 0, 't' }, { "lzma", 0, OPTION_LZMA }, { "modification-time", 0, 'm' }, { "newer", 1, OPTION_NEWER_CTIME }, { "newer-ctime", 1, OPTION_NEWER_CTIME }, { "newer-ctime-than", 1, OPTION_NEWER_CTIME_THAN }, { "newer-mtime", 1, OPTION_NEWER_MTIME }, { "newer-mtime-than", 1, OPTION_NEWER_MTIME_THAN }, { "newer-than", 1, OPTION_NEWER_CTIME_THAN }, { "nodump", 0, OPTION_NODUMP }, { "norecurse", 0, 'n' }, { "no-recursion", 0, 'n' }, { "no-same-owner", 0, OPTION_NO_SAME_OWNER }, { "no-same-permissions", 0, OPTION_NO_SAME_PERMISSIONS }, { "null", 0, OPTION_NULL }, { "numeric-owner", 0, OPTION_NUMERIC_OWNER }, { "one-file-system", 0, OPTION_ONE_FILE_SYSTEM }, { "posix", 0, OPTION_POSIX }, { "preserve-permissions", 0, 'p' }, { "read-full-blocks", 0, 'B' }, { "same-owner", 0, OPTION_SAME_OWNER }, { "same-permissions", 0, 'p' }, { "strip-components", 1, OPTION_STRIP_COMPONENTS }, { "to-stdout", 0, 'O' }, { "totals", 0, OPTION_TOTALS }, { "uncompress", 0, 'Z' }, { "unlink", 0, 'U' }, { "unlink-first", 0, 'U' }, { "update", 0, 'u' }, { "use-compress-program", 1, OPTION_USE_COMPRESS_PROGRAM }, { "verbose", 0, 'v' }, { "version", 0, OPTION_VERSION }, { "xz", 0, 'J' }, { NULL, 0, 0 } }; /* * This getopt implementation has two key features that common * getopt_long() implementations lack. Apart from those, it's a * straightforward option parser, considerably simplified by not * needing to support the wealth of exotic getopt_long() features. It * has, of course, been shamelessly tailored for bsdtar. (If you're * looking for a generic getopt_long() implementation for your * project, I recommend Gregory Pietsch's public domain getopt_long() * implementation.) The two additional features are: * * Old-style tar arguments: The original tar implementation treated * the first argument word as a list of single-character option * letters. All arguments follow as separate words. For example, * tar xbf 32 /dev/tape * Here, the "xbf" is three option letters, "32" is the argument for * "b" and "/dev/tape" is the argument for "f". We support this usage * if the first command-line argument does not begin with '-'. We * also allow regular short and long options to follow, e.g., * tar xbf 32 /dev/tape -P --format=pax * * -W long options: There's an obscure GNU convention (only rarely * supported even there) that allows "-W option=argument" as an * alternative way to support long options. This was supported in * early bsdtar as a way to access long options on platforms that did * not support getopt_long() and is preserved here for backwards * compatibility. (Of course, if I'd started with a custom * command-line parser from the beginning, I would have had normal * long option support on every platform so that hack wouldn't have * been necessary. Oh, well. Some mistakes you just have to live * with.) * * TODO: We should be able to use this to pull files and intermingled * options (such as -C) from the command line in write mode. That * will require a little rethinking of the argument handling in * bsdtar.c. * * TODO: If we want to support arbitrary command-line options from -T * input (as GNU tar does), we may need to extend this to handle option * words from sources other than argv/arc. I'm not really sure if I * like that feature of GNU tar, so it's certainly not a priority. */ int bsdtar_getopt(struct bsdtar *bsdtar) { enum { state_start = 0, state_old_tar, state_next_word, state_short, state_long }; static int state = state_start; static char *opt_word; const struct option *popt, *match = NULL, *match2 = NULL; const char *p, *long_prefix = "--"; size_t optlength; int opt = '?'; int required = 0; bsdtar->optarg = NULL; /* First time through, initialize everything. */ if (state == state_start) { /* Skip program name. */ ++bsdtar->argv; --bsdtar->argc; if (*bsdtar->argv == NULL) return (-1); /* Decide between "new style" and "old style" arguments. */ if (bsdtar->argv[0][0] == '-') { state = state_next_word; } else { state = state_old_tar; opt_word = *bsdtar->argv++; --bsdtar->argc; } } /* * We're parsing old-style tar arguments */ if (state == state_old_tar) { /* Get the next option character. */ opt = *opt_word++; if (opt == '\0') { /* New-style args can follow old-style. */ state = state_next_word; } else { /* See if it takes an argument. */ p = strchr(short_options, opt); if (p == NULL) return ('?'); if (p[1] == ':') { bsdtar->optarg = *bsdtar->argv; if (bsdtar->optarg == NULL) { lafe_warnc(0, "Option %c requires an argument", opt); return ('?'); } ++bsdtar->argv; --bsdtar->argc; } } } /* * We're ready to look at the next word in argv. */ if (state == state_next_word) { /* No more arguments, so no more options. */ if (bsdtar->argv[0] == NULL) return (-1); /* Doesn't start with '-', so no more options. */ if (bsdtar->argv[0][0] != '-') return (-1); /* "--" marks end of options; consume it and return. */ if (strcmp(bsdtar->argv[0], "--") == 0) { ++bsdtar->argv; --bsdtar->argc; return (-1); } /* Get next word for parsing. */ opt_word = *bsdtar->argv++; --bsdtar->argc; if (opt_word[1] == '-') { /* Set up long option parser. */ state = state_long; opt_word += 2; /* Skip leading '--' */ } else { /* Set up short option parser. */ state = state_short; ++opt_word; /* Skip leading '-' */ } } /* * We're parsing a group of POSIX-style single-character options. */ if (state == state_short) { /* Peel next option off of a group of short options. */ opt = *opt_word++; if (opt == '\0') { /* End of this group; recurse to get next option. */ state = state_next_word; return bsdtar_getopt(bsdtar); } /* Does this option take an argument? */ p = strchr(short_options, opt); if (p == NULL) return ('?'); if (p[1] == ':') required = 1; /* If it takes an argument, parse that. */ if (required) { /* If arg is run-in, opt_word already points to it. */ if (opt_word[0] == '\0') { /* Otherwise, pick up the next word. */ opt_word = *bsdtar->argv; if (opt_word == NULL) { lafe_warnc(0, "Option -%c requires an argument", opt); return ('?'); } ++bsdtar->argv; --bsdtar->argc; } if (opt == 'W') { state = state_long; long_prefix = "-W "; /* For clearer errors. */ } else { state = state_next_word; bsdtar->optarg = opt_word; } } } /* We're reading a long option, including -W long=arg convention. */ if (state == state_long) { /* After this long option, we'll be starting a new word. */ state = state_next_word; /* Option name ends at '=' if there is one. */ p = strchr(opt_word, '='); if (p != NULL) { optlength = (size_t)(p - opt_word); bsdtar->optarg = (char *)(uintptr_t)(p + 1); } else { optlength = strlen(opt_word); } /* Search the table for an unambiguous match. */ for (popt = tar_longopts; popt->name != NULL; popt++) { /* Short-circuit if first chars don't match. */ if (popt->name[0] != opt_word[0]) continue; /* If option is a prefix of name in table, record it.*/ if (strncmp(opt_word, popt->name, optlength) == 0) { match2 = match; /* Record up to two matches. */ match = popt; /* If it's an exact match, we're done. */ if (strlen(popt->name) == optlength) { match2 = NULL; /* Forget the others. */ break; } } } /* Fail if there wasn't a unique match. */ if (match == NULL) { lafe_warnc(0, "Option %s%s is not supported", long_prefix, opt_word); return ('?'); } if (match2 != NULL) { lafe_warnc(0, "Ambiguous option %s%s (matches --%s and --%s)", long_prefix, opt_word, match->name, match2->name); return ('?'); } /* We've found a unique match; does it need an argument? */ if (match->required) { /* Argument required: get next word if necessary. */ if (bsdtar->optarg == NULL) { bsdtar->optarg = *bsdtar->argv; if (bsdtar->optarg == NULL) { lafe_warnc(0, "Option %s%s requires an argument", long_prefix, match->name); return ('?'); } ++bsdtar->argv; --bsdtar->argc; } } else { /* Argument forbidden: fail if there is one. */ if (bsdtar->optarg != NULL) { lafe_warnc(0, "Option %s%s does not allow an argument", long_prefix, match->name); return ('?'); } } return (match->equivalent); } return (opt); }