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402 lines
15 KiB
402 lines
15 KiB
/* $OpenBSD: getopt_long.c,v 1.26 2013/06/08 22:47:56 millert Exp $ */ |
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/* $NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $ */ |
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/* |
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* Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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* |
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* Sponsored in part by the Defense Advanced Research Projects |
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* Agency (DARPA) and Air Force Research Laboratory, Air Force |
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* Materiel Command, USAF, under agreement number F39502-99-1-0512. |
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*/ |
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/*- |
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* Copyright (c) 2000 The NetBSD Foundation, Inc. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to The NetBSD Foundation |
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* by Dieter Baron and Thomas Klausner. |
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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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* |
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include <stdbool.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 <sys/cdefs.h> |
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#include <log/getopt.h> |
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#define PRINT_ERROR ((context->opterr) && (*options != ':')) |
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#define FLAG_PERMUTE 0x01 // permute non-options to the end of argv |
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#define FLAG_ALLARGS 0x02 // treat non-options as args to option "-1" |
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// return values |
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#define BADCH (int)'?' |
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#define BADARG ((*options == ':') ? (int)':' : (int)'?') |
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#define INORDER (int)1 |
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#define D_PREFIX 0 |
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#define DD_PREFIX 1 |
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#define W_PREFIX 2 |
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// Compute the greatest common divisor of a and b. |
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static int gcd(int a, int b) { |
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int c = a % b; |
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while (c) { |
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a = b; |
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b = c; |
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c = a % b; |
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} |
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return b; |
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} |
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// Exchange the block from nonopt_start to nonopt_end with the block from |
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// nonopt_end to opt_end (keeping the same order of arguments in each block). |
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// Returns optind - (nonopt_end - nonopt_start) for convenience. |
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static int permute_args(getopt_context* context, char* const* nargv) { |
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// compute lengths of blocks and number and size of cycles |
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int nnonopts = context->nonopt_end - context->nonopt_start; |
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int nopts = context->optind - context->nonopt_end; |
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int ncycle = gcd(nnonopts, nopts); |
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int cyclelen = (context->optind - context->nonopt_start) / ncycle; |
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for (int i = 0; i < ncycle; i++) { |
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int cstart = context->nonopt_end + i; |
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int pos = cstart; |
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for (int j = 0; j < cyclelen; j++) { |
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if (pos >= context->nonopt_end) { |
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pos -= nnonopts; |
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} else { |
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pos += nopts; |
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} |
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char* swap = nargv[pos]; |
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const_cast<char**>(nargv)[pos] = nargv[cstart]; |
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const_cast<char**>(nargv)[cstart] = swap; |
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} |
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} |
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return context->optind - (context->nonopt_end - context->nonopt_start); |
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} |
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// parse_long_options_r -- |
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// Parse long options in argc/argv argument vector. |
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// Returns -1 if short_too is set and the option does not match long_options. |
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static int parse_long_options_r(char* const* nargv, const char* options, |
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const struct option* long_options, int* idx, |
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bool short_too, struct getopt_context* context) { |
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const char* current_argv = context->place; |
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const char* current_dash; |
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switch (context->dash_prefix) { |
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case D_PREFIX: |
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current_dash = "-"; |
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break; |
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case DD_PREFIX: |
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current_dash = "--"; |
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break; |
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case W_PREFIX: |
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current_dash = "-W "; |
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break; |
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default: |
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current_dash = ""; |
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break; |
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} |
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context->optind++; |
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const char* has_equal; |
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size_t current_argv_len; |
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if (!!(has_equal = strchr(current_argv, '='))) { |
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// argument found (--option=arg) |
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current_argv_len = has_equal - current_argv; |
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has_equal++; |
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} else { |
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current_argv_len = strlen(current_argv); |
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} |
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int match = -1; |
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bool exact_match = false; |
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bool second_partial_match = false; |
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for (int i = 0; long_options[i].name; i++) { |
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// find matching long option |
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if (strncmp(current_argv, long_options[i].name, current_argv_len)) { |
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continue; |
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} |
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if (strlen(long_options[i].name) == current_argv_len) { |
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// exact match |
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match = i; |
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exact_match = true; |
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break; |
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} |
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// If this is a known short option, don't allow |
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// a partial match of a single character. |
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if (short_too && current_argv_len == 1) continue; |
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if (match == -1) { // first partial match |
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match = i; |
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} else if (long_options[i].has_arg != long_options[match].has_arg || |
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long_options[i].flag != long_options[match].flag || |
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long_options[i].val != long_options[match].val) { |
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second_partial_match = true; |
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} |
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} |
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if (!exact_match && second_partial_match) { |
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// ambiguous abbreviation |
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if (PRINT_ERROR) { |
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fprintf(context->optstderr ?: stderr, |
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"option `%s%.*s' is ambiguous", current_dash, |
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(int)current_argv_len, current_argv); |
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} |
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context->optopt = 0; |
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return BADCH; |
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} |
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if (match != -1) { // option found |
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if (long_options[match].has_arg == no_argument && has_equal) { |
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if (PRINT_ERROR) { |
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fprintf(context->optstderr ?: stderr, |
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"option `%s%.*s' doesn't allow an argument", |
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current_dash, (int)current_argv_len, current_argv); |
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} |
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// XXX: GNU sets optopt to val regardless of flag |
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context->optopt = |
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long_options[match].flag ? 0 : long_options[match].val; |
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return BADCH; |
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} |
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if (long_options[match].has_arg == required_argument || |
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long_options[match].has_arg == optional_argument) { |
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if (has_equal) { |
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context->optarg = has_equal; |
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} else if (long_options[match].has_arg == required_argument) { |
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// optional argument doesn't use next nargv |
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context->optarg = nargv[context->optind++]; |
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} |
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} |
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if ((long_options[match].has_arg == required_argument) && |
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!context->optarg) { |
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// Missing argument; leading ':' indicates no error |
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// should be generated. |
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if (PRINT_ERROR) { |
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fprintf(context->optstderr ?: stderr, |
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"option `%s%s' requires an argument", current_dash, |
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current_argv); |
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} |
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// XXX: GNU sets optopt to val regardless of flag |
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context->optopt = |
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long_options[match].flag ? 0 : long_options[match].val; |
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context->optind--; |
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return BADARG; |
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} |
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} else { // unknown option |
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if (short_too) { |
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context->optind--; |
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return -1; |
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} |
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if (PRINT_ERROR) { |
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fprintf(context->optstderr ?: stderr, "unrecognized option `%s%s'", |
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current_dash, current_argv); |
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} |
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context->optopt = 0; |
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return BADCH; |
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} |
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if (idx) *idx = match; |
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if (long_options[match].flag) { |
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*long_options[match].flag = long_options[match].val; |
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return 0; |
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} |
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return long_options[match].val; |
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} |
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// getopt_long_r -- |
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// Parse argc/argv argument vector. |
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int getopt_long_r(int nargc, char* const* nargv, const char* options, |
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const struct option* long_options, int* idx, |
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struct getopt_context* context) { |
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if (!options) return -1; |
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// XXX Some GNU programs (like cvs) set optind to 0 instead of |
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// XXX using optreset. Work around this braindamage. |
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if (!context->optind) context->optind = context->optreset = 1; |
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// Disable GNU extensions if options string begins with a '+'. |
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int flags = FLAG_PERMUTE; |
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if (*options == '-') { |
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flags |= FLAG_ALLARGS; |
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} else if (*options == '+') { |
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flags &= ~FLAG_PERMUTE; |
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} |
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if (*options == '+' || *options == '-') options++; |
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context->optarg = nullptr; |
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if (context->optreset) context->nonopt_start = context->nonopt_end = -1; |
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start: |
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if (context->optreset || !*context->place) { // update scanning pointer |
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context->optreset = 0; |
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if (context->optind >= nargc) { // end of argument vector |
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context->place = EMSG; |
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if (context->nonopt_end != -1) { |
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// do permutation, if we have to |
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context->optind = permute_args(context, nargv); |
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} else if (context->nonopt_start != -1) { |
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// If we skipped non-options, set optind to the first of them. |
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context->optind = context->nonopt_start; |
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} |
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context->nonopt_start = context->nonopt_end = -1; |
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return -1; |
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} |
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if (*(context->place = nargv[context->optind]) != '-' || |
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context->place[1] == '\0') { |
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context->place = EMSG; // found non-option |
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if (flags & FLAG_ALLARGS) { |
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// GNU extension: return non-option as argument to option 1 |
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context->optarg = nargv[context->optind++]; |
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return INORDER; |
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} |
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if (!(flags & FLAG_PERMUTE)) { |
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// If no permutation wanted, stop parsing at first non-option. |
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return -1; |
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} |
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// do permutation |
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if (context->nonopt_start == -1) { |
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context->nonopt_start = context->optind; |
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} else if (context->nonopt_end != -1) { |
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context->nonopt_start = permute_args(context, nargv); |
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context->nonopt_end = -1; |
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} |
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context->optind++; |
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// process next argument |
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goto start; |
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} |
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if (context->nonopt_start != -1 && context->nonopt_end == -1) { |
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context->nonopt_end = context->optind; |
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} |
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// If we have "-" do nothing, if "--" we are done. |
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if (context->place[1] != '\0' && *++(context->place) == '-' && |
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context->place[1] == '\0') { |
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context->optind++; |
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context->place = EMSG; |
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// We found an option (--), so if we skipped |
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// non-options, we have to permute. |
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if (context->nonopt_end != -1) { |
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context->optind = permute_args(context, nargv); |
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} |
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context->nonopt_start = context->nonopt_end = -1; |
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return -1; |
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} |
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} |
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int optchar; |
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// Check long options if: |
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// 1) we were passed some |
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// 2) the arg is not just "-" |
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// 3) either the arg starts with -- we are getopt_long_only() |
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if (long_options && context->place != nargv[context->optind] && |
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(*context->place == '-')) { |
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bool short_too = false; |
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context->dash_prefix = D_PREFIX; |
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if (*context->place == '-') { |
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context->place++; // --foo long option |
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context->dash_prefix = DD_PREFIX; |
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} else if (*context->place != ':' && strchr(options, *context->place)) { |
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short_too = true; // could be short option too |
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} |
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optchar = parse_long_options_r(nargv, options, long_options, idx, |
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short_too, context); |
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if (optchar != -1) { |
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context->place = EMSG; |
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return optchar; |
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} |
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} |
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const char* oli; // option letter list index |
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if ((optchar = (int)*(context->place)++) == (int)':' || |
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(optchar == (int)'-' && *context->place != '\0') || |
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!(oli = strchr(options, optchar))) { |
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// If the user specified "-" and '-' isn't listed in |
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// options, return -1 (non-option) as per POSIX. |
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// Otherwise, it is an unknown option character (or ':'). |
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if (optchar == (int)'-' && *context->place == '\0') return -1; |
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if (!*context->place) context->optind++; |
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if (PRINT_ERROR) { |
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fprintf(context->optstderr ?: stderr, "invalid option -- %c", |
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optchar); |
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} |
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context->optopt = optchar; |
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return BADCH; |
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} |
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static const char recargchar[] = "option requires an argument -- %c"; |
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if (long_options && optchar == 'W' && oli[1] == ';') { |
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// -W long-option |
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if (*context->place) { // no space |
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; // NOTHING |
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} else if (++(context->optind) >= nargc) { // no arg |
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context->place = EMSG; |
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if (PRINT_ERROR) { |
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fprintf(context->optstderr ?: stderr, recargchar, optchar); |
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} |
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context->optopt = optchar; |
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return BADARG; |
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} else { // white space |
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context->place = nargv[context->optind]; |
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} |
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context->dash_prefix = W_PREFIX; |
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optchar = parse_long_options_r(nargv, options, long_options, idx, false, |
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context); |
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context->place = EMSG; |
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return optchar; |
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} |
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if (*++oli != ':') { // doesn't take argument |
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if (!*context->place) context->optind++; |
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} else { // takes (optional) argument |
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context->optarg = nullptr; |
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if (*context->place) { // no white space |
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context->optarg = context->place; |
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} else if (oli[1] != ':') { // arg not optional |
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if (++(context->optind) >= nargc) { // no arg |
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context->place = EMSG; |
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if (PRINT_ERROR) { |
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fprintf(context->optstderr ?: stderr, recargchar, optchar); |
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} |
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context->optopt = optchar; |
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return BADARG; |
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} |
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context->optarg = nargv[context->optind]; |
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} |
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context->place = EMSG; |
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context->optind++; |
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} |
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// dump back option letter |
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return optchar; |
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}
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