501 lines
13 KiB
C
501 lines
13 KiB
C
/* $NetBSD: getopt_long.c,v 1.24 2007/11/09 03:29:20 christos Exp $ */
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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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#ifdef __minix
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#define _DIAGASSERT assert
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#else
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: getopt_long.c,v 1.24 2007/11/09 03:29:20 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#endif
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#if HAVE_NBTOOL_CONFIG_H
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#include "compat_getopt.h"
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#else
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#include <getopt.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#if HAVE_NBTOOL_CONFIG_H && !HAVE_GETOPT_LONG && !HAVE_DECL_OPTIND
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#define REPLACE_GETOPT
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#endif
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#ifdef REPLACE_GETOPT
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#ifdef __weak_alias
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__weak_alias(getopt,_getopt)
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#endif
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int opterr = 1; /* if error message should be printed */
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int optind = 1; /* index into parent argv vector */
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int optopt = '?'; /* character checked for validity */
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int optreset; /* reset getopt */
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char *optarg; /* argument associated with option */
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#elif HAVE_NBTOOL_CONFIG_H && !HAVE_DECL_OPTRESET
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static int optreset;
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#endif
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#ifdef __weak_alias
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__weak_alias(getopt_long,_getopt_long)
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#endif
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#define IGNORE_FIRST (*options == '-' || *options == '+')
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#define PRINT_ERROR ((opterr) && ((*options != ':') \
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|| (IGNORE_FIRST && options[1] != ':')))
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#define IS_POSIXLY_CORRECT (getenv("POSIXLY_CORRECT") != NULL)
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#define PERMUTE (!IS_POSIXLY_CORRECT && !IGNORE_FIRST)
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/* XXX: GNU ignores PC if *options == '-' */
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#define IN_ORDER (!IS_POSIXLY_CORRECT && *options == '-')
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/* return values */
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#define BADCH (int)'?'
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#define BADARG ((IGNORE_FIRST && options[1] == ':') \
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|| (*options == ':') ? (int)':' : (int)'?')
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#define INORDER (int)1
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#define EMSG ""
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static int getopt_internal __P((int, char **, const char *));
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static int gcd __P((int, int));
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static void permute_args __P((int, int, int, char **));
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static const char *place = EMSG; /* option letter processing */
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/* XXX: set optreset to 1 rather than these two */
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static int nonopt_start = -1; /* first non option argument (for permute) */
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static int nonopt_end = -1; /* first option after non options (for permute) */
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/* Error messages */
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static const char recargchar[] = "option requires an argument -- %c";
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static const char recargstring[] = "option requires an argument -- %s";
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static const char ambig[] = "ambiguous option -- %.*s";
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static const char noarg[] = "option doesn't take an argument -- %.*s";
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static const char illoptchar[] = "unknown option -- %c";
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static const char illoptstring[] = "unknown option -- %s";
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/*
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* Compute the greatest common divisor of a and b.
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*/
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static int
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gcd(a, b)
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int a;
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int b;
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{
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int c;
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c = a % b;
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while (c != 0) {
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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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/*
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* Exchange the block from nonopt_start to nonopt_end with the block
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* from nonopt_end to opt_end (keeping the same order of arguments
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* in each block).
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*/
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static void
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permute_args(panonopt_start, panonopt_end, opt_end, nargv)
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int panonopt_start;
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int panonopt_end;
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int opt_end;
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char **nargv;
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{
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int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
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char *swap;
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_DIAGASSERT(nargv != NULL);
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/*
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* compute lengths of blocks and number and size of cycles
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*/
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nnonopts = panonopt_end - panonopt_start;
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nopts = opt_end - panonopt_end;
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ncycle = gcd(nnonopts, nopts);
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cyclelen = (opt_end - panonopt_start) / ncycle;
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for (i = 0; i < ncycle; i++) {
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cstart = panonopt_end+i;
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pos = cstart;
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for (j = 0; j < cyclelen; j++) {
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if (pos >= panonopt_end)
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pos -= nnonopts;
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else
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pos += nopts;
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swap = nargv[pos];
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nargv[pos] = nargv[cstart];
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nargv[cstart] = swap;
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}
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}
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}
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/*
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* getopt_internal --
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* Parse argc/argv argument vector. Called by user level routines.
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* Returns -2 if -- is found (can be long option or end of options marker).
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*/
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static int
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getopt_internal(nargc, nargv, options)
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int nargc;
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char **nargv;
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const char *options;
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{
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char *oli; /* option letter list index */
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int optchar;
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_DIAGASSERT(nargv != NULL);
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_DIAGASSERT(options != NULL);
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optarg = NULL;
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/*
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* XXX Some programs (like rsyncd) expect to be able to
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* XXX re-initialize optind to 0 and have getopt_long(3)
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* XXX properly function again. Work around this braindamage.
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*/
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if (optind == 0)
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optind = 1;
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if (optreset)
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nonopt_start = nonopt_end = -1;
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start:
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if (optreset || !*place) { /* update scanning pointer */
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optreset = 0;
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if (optind >= nargc) { /* end of argument vector */
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place = EMSG;
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if (nonopt_end != -1) {
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/* do permutation, if we have to */
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permute_args(nonopt_start, nonopt_end,
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optind, nargv);
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optind -= nonopt_end - nonopt_start;
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}
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else if (nonopt_start != -1) {
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/*
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* If we skipped non-options, set optind
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* to the first of them.
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*/
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optind = nonopt_start;
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}
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nonopt_start = nonopt_end = -1;
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return -1;
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}
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if ((*(place = nargv[optind]) != '-')
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|| (place[1] == '\0')) { /* found non-option */
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place = EMSG;
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if (IN_ORDER) {
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/*
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* GNU extension:
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* return non-option as argument to option 1
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*/
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optarg = nargv[optind++];
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return INORDER;
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}
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if (!PERMUTE) {
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/*
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* if no permutation wanted, stop parsing
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* at first non-option
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*/
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return -1;
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}
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/* do permutation */
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if (nonopt_start == -1)
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nonopt_start = optind;
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else if (nonopt_end != -1) {
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permute_args(nonopt_start, nonopt_end,
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optind, nargv);
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nonopt_start = optind -
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(nonopt_end - nonopt_start);
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nonopt_end = -1;
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}
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optind++;
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/* process next argument */
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goto start;
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}
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if (nonopt_start != -1 && nonopt_end == -1)
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nonopt_end = optind;
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if (place[1] && *++place == '-') { /* found "--" */
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place++;
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return -2;
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}
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}
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if ((optchar = (int)*place++) == (int)':' ||
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(oli = strchr(options + (IGNORE_FIRST ? 1 : 0), optchar)) == NULL) {
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/* option letter unknown or ':' */
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if (!*place)
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++optind;
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if (PRINT_ERROR)
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warnx(illoptchar, optchar);
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optopt = optchar;
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return BADCH;
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}
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if (optchar == 'W' && oli[1] == ';') { /* -W long-option */
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/* XXX: what if no long options provided (called by getopt)? */
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if (*place)
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return -2;
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if (++optind >= nargc) { /* no arg */
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place = EMSG;
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if (PRINT_ERROR)
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warnx(recargchar, optchar);
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optopt = optchar;
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return BADARG;
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} else /* white space */
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place = nargv[optind];
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/*
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* Handle -W arg the same as --arg (which causes getopt to
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* stop parsing).
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*/
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return -2;
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}
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if (*++oli != ':') { /* doesn't take argument */
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if (!*place)
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++optind;
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} else { /* takes (optional) argument */
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optarg = NULL;
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if (*place) /* no white space */
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optarg = __UNCONST(place);
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/* XXX: disable test for :: if PC? (GNU doesn't) */
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else if (oli[1] != ':') { /* arg not optional */
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if (++optind >= nargc) { /* no arg */
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place = EMSG;
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if (PRINT_ERROR)
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warnx(recargchar, optchar);
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optopt = optchar;
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return BADARG;
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} else
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optarg = nargv[optind];
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}
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place = EMSG;
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++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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#ifdef REPLACE_GETOPT
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/*
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* getopt --
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* Parse argc/argv argument vector.
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*
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* [eventually this will replace the real getopt]
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*/
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int
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getopt(nargc, nargv, options)
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int nargc;
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char * const *nargv;
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const char *options;
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{
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int retval;
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_DIAGASSERT(nargv != NULL);
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_DIAGASSERT(options != NULL);
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retval = getopt_internal(nargc, __UNCONST(nargv), options);
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if (retval == -2) {
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++optind;
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/*
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* We found an option (--), so if we skipped non-options,
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* we have to permute.
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*/
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if (nonopt_end != -1) {
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permute_args(nonopt_start, nonopt_end, optind,
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nargv);
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optind -= nonopt_end - nonopt_start;
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}
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nonopt_start = nonopt_end = -1;
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retval = -1;
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}
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return retval;
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}
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#endif
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/*
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* getopt_long --
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* Parse argc/argv argument vector.
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*/
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int
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getopt_long(nargc, nargv, options, long_options, idx)
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int nargc;
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char * const *nargv;
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const char *options;
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const struct option *long_options;
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int *idx;
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{
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int retval;
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#define IDENTICAL_INTERPRETATION(_x, _y) \
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(long_options[(_x)].has_arg == long_options[(_y)].has_arg && \
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long_options[(_x)].flag == long_options[(_y)].flag && \
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long_options[(_x)].val == long_options[(_y)].val)
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_DIAGASSERT(nargv != NULL);
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_DIAGASSERT(options != NULL);
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_DIAGASSERT(long_options != NULL);
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/* idx may be NULL */
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retval = getopt_internal(nargc, __UNCONST(nargv), options);
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if (retval == -2) {
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char *current_argv, *has_equal;
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size_t current_argv_len;
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int i, ambiguous, match;
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current_argv = __UNCONST(place);
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match = -1;
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ambiguous = 0;
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optind++;
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place = EMSG;
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if (*current_argv == '\0') { /* found "--" */
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/*
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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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*/
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if (nonopt_end != -1) {
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permute_args(nonopt_start, nonopt_end,
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optind, __UNCONST(nargv));
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optind -= nonopt_end - nonopt_start;
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}
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nonopt_start = nonopt_end = -1;
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return -1;
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}
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if ((has_equal = strchr(current_argv, '=')) != NULL) {
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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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for (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,
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current_argv_len))
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continue;
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if (strlen(long_options[i].name) ==
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(unsigned)current_argv_len) {
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/* exact match */
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match = i;
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ambiguous = 0;
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break;
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}
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if (match == -1) /* partial match */
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match = i;
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else if (!IDENTICAL_INTERPRETATION(i, match))
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ambiguous = 1;
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}
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if (ambiguous) {
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/* ambiguous abbreviation */
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if (PRINT_ERROR)
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warnx(ambig, (int)current_argv_len,
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current_argv);
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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
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&& has_equal) {
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if (PRINT_ERROR)
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warnx(noarg, (int)current_argv_len,
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current_argv);
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/*
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* XXX: GNU sets optopt to val regardless of
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* flag
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*/
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if (long_options[match].flag == NULL)
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optopt = long_options[match].val;
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else
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optopt = 0;
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return BADARG;
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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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optarg = has_equal;
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else if (long_options[match].has_arg ==
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required_argument) {
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/*
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* optional argument doesn't use
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* next nargv
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*/
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optarg = nargv[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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&& (optarg == NULL)) {
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/*
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* Missing argument; leading ':'
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* indicates no error should be generated
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*/
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if (PRINT_ERROR)
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warnx(recargstring, current_argv);
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/*
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* XXX: GNU sets optopt to val regardless
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* of flag
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*/
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if (long_options[match].flag == NULL)
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optopt = long_options[match].val;
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else
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optopt = 0;
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--optind;
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return BADARG;
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}
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} else { /* unknown option */
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if (PRINT_ERROR)
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warnx(illoptstring, current_argv);
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optopt = 0;
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return BADCH;
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}
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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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retval = 0;
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} else
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retval = long_options[match].val;
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if (idx)
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*idx = match;
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}
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return retval;
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#undef IDENTICAL_INTERPRETATION
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}
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