332 lines
9.4 KiB
C
332 lines
9.4 KiB
C
/* $NetBSD: getopt.c,v 1.1 2009/03/22 22:33:13 joerg Exp $*/
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/* Modified by David Anderson to work with GNU/Linux and freebsd.
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Added {} for clarity.
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Switched to standard dwarfdump formatting.
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Treatment of : modified so that :: gets dwoptarg NULL
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if space follows the letter
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(the dwoptarg is set to null).
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renamed to make it clear this is a private version.
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Oct 17 2017: Created dwgetopt_long(). See dwgetopt.h
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*/
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/*
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* Copyright (c) 1987, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* This does not presently handle the option string
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leading + or leading - features. Such are not used
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by by libdwarfdump. Nor does it understand the
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GNU Env var POSIXLY_CORRECT .
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It does know of the leading ":" in the option string.
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See BADCH below.
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*/
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#include <stdio.h>
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#include <stdlib.h> /* For exit() */
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#include <string.h> /* For strchr */
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#include "dwgetopt.h"
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#define STRIP_OFF_CONSTNESS(a) ((void *)(size_t)(const void *)(a))
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int dwopterr = 1, /* if error message should be printed */
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dwoptind = 1, /* index into parent argv vector */
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dwoptopt, /* character checked for validity */
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dwoptreset; /* reset getopt */
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char *dwoptarg; /* argument associated with option */
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#define BADCH (int)'?'
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#define BADARG (int)':'
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#define EMSG ""
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#define TRUE 1
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#define FALSE 0
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#if 0 /* FOR DEBUGGING ONLY */
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/* Use for testing dwgetopt only.
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Not a standard function. */
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void
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dwgetoptresetfortestingonly(void)
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{
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dwopterr = 1;
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dwoptind = 1;
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dwoptopt = 0;
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dwoptreset = 0;
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dwoptarg = 0;
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}
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#endif /* FOR DEBUGGING ONLY */
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static const char *place = EMSG;/* option letter processing */
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static int dwoptnamematches(
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const struct dwoption *dwlopt,
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const char *iplace,
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const char **argloc,
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int *argerr)
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{
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const char *eq = 0;
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unsigned namelen = 0;
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unsigned arglen = 0;
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int d = 0;
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for(eq = iplace; *eq; ++eq) {
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if (*eq != '=') {
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continue;
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}
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/* Found =, arg should follow */
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namelen = (eq - iplace);
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if (namelen != (unsigned)strlen(dwlopt->name)) {
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return FALSE;
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}
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eq++;
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arglen = strlen(eq);
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break;
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}
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if (namelen) {
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d = strncmp(iplace,dwlopt->name,namelen);
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if (d) {
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return FALSE;
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}
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if (dwlopt->has_arg == 0) {
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*argerr = TRUE;
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return TRUE;
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}
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if (arglen) {
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/* Discarding const, avoiding warning.
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Data is in user space, so this is ok. */
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dwoptarg = (char *)eq;
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*argloc = (const char *)eq;
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} else {
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/* Has arg = but arg is empty. */
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dwoptarg = 0;
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}
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return TRUE;
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} else {
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d = strcmp(iplace,dwlopt->name);
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if (d) {
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return FALSE;
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}
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if (dwlopt->has_arg == 1) {
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*argerr = TRUE;
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return TRUE;
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}
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dwoptarg = 0;
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return TRUE;
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}
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}
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/* dwgetopt_long
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A reimplemenation of a portion of
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the getopt(3) GNU/Linux getopt_long().
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See dwgetopt.h for more details.
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*/
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int dwgetopt_long(int nargc, char *const nargv[],
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const char *ostr,
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const struct dwoption* longopts,
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int *longindex)
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{
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char *lplace = 0;
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if (dwoptreset) {
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/* Not really supported. */
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place = EMSG;
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return (-1);
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}
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if (*place) {
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int v = dwgetopt(nargc,nargv,ostr);
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return v;
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}
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/* Use local lplace in case we need to call getopt()
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just below. */
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lplace = nargv[dwoptind];
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if (dwoptind >= nargc || *lplace++ != '-') {
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/* Argument is absent or is not an option */
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place = EMSG;
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return (-1);
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}
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if (*lplace != '-') {
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/* Notice place not disturbed. */
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int v = dwgetopt(nargc,nargv,ostr);
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return v;
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}
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/* Starts with two dashes.
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Now we set the global place */
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place = lplace+1;
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if (!*place) {
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/* "--" => end of options */
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++dwoptind;
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place = EMSG;
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return (-1);
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}
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/* We think this is a longopt. */
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{
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int lo_num = 0;
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for(;;lo_num++) {
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const struct dwoption *dwlopt = longopts +lo_num;
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const char * argloc = 0;
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int argerr = 0;
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if (!dwlopt->name) {
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dwoptind++;
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place = EMSG;
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return (-1);
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}
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if (dwoptnamematches(dwlopt,place,&argloc,&argerr)) {
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*longindex = lo_num;
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dwoptarg = 0;
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if (argloc) {
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/* Must drop const here. Ugh. */
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dwoptarg = (char *)argloc;
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}
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dwoptind++;
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place = EMSG;
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return dwlopt->val;
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}
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if (argerr) {
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place = EMSG;
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dwoptind++;
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return (-1);
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}
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}
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place = EMSG;
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dwoptind++;
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return (-1);
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}
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}
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/*
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* getopt --
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* Parse argc/argv argument vector.
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* a: means
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* -afoo
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* -a foo
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* and 'foo' is returned in dwoptarg
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* b:: means
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* -b
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* and dwoptarg is null
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* -bother
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* and dwoptarg is 'other'
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*/
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int
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dwgetopt(int nargc, char * const nargv[], const char *ostr)
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{
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char *oli; /* option letter list index */
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if (dwoptreset || *place == 0) { /* update scanning pointer */
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dwoptreset = 0;
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place = nargv[dwoptind];
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if (dwoptind >= nargc || *place++ != '-') {
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/* Argument is absent or is not an option */
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place = EMSG;
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return (-1);
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}
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dwoptopt = *place++;
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if (dwoptopt == '-' && *place == 0) {
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/* "--" => end of options */
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++dwoptind;
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place = EMSG;
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return (-1);
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}
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if (dwoptopt == 0) {
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/* Solitary '-', treat as a '-' option
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if the program (eg su) is looking for it. */
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place = EMSG;
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if (strchr(ostr, '-') == NULL) {
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return -1;
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}
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dwoptopt = '-';
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}
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} else {
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dwoptopt = *place++;
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}
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/* See if option letter is one the caller wanted... */
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if (dwoptopt == ':' || (oli = strchr(ostr, dwoptopt)) == NULL) {
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if (*place == 0) {
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++dwoptind;
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}
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if (dwopterr && *ostr != ':') {
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(void)fprintf(stderr,
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"%s: invalid option -- '%c'\n",
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nargv[0]?nargv[0]:"",
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dwoptopt);
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}
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return (BADCH);
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}
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/* Does this option need an argument? */
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if (oli[1] != ':') {
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/* don't need argument */
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dwoptarg = NULL;
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if (*place == 0) {
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++dwoptind;
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}
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} else {
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int reqnextarg = 1;
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if (oli[1] && (oli[2] == ':')) {
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/* Pair of :: means special treatment of dwoptarg */
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reqnextarg = 0;
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}
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/* Option-argument is either the rest of this argument or the
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entire next argument. */
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if (*place ) {
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/* Whether : or :: */
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dwoptarg = STRIP_OFF_CONSTNESS(place);
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} else if (reqnextarg) {
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/* ! *place */
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if (nargc > (++dwoptind)) {
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dwoptarg = nargv[dwoptind];
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} else {
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place=EMSG;
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/* Next arg required, but is missing */
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if (*ostr == ':') {
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/* Leading : in ostr calls for BADARG return. */
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return (BADARG);
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}
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if (dwopterr) {
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(void)fprintf(stderr,
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"%s: option requires an argument. -- '%c'\n",
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nargv[0]?nargv[0]:"",
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dwoptopt);
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}
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return (BADCH);
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}
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} else {
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/* ! *place */
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/* The key part of :: treatment. */
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dwoptarg = NULL;
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}
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place = EMSG;
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++dwoptind;
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}
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return (dwoptopt); /* return option letter */
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}
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