401 lines
15 KiB
C++
401 lines
15 KiB
C++
/* $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 <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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