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108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Copyright (c) 1987 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getopt.c 4.12 (Berkeley) 6/1/90";
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#endif /* LIBC_SCCS and not lint */
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#include <stdio.h>
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#include <string.h>
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#define index strchr
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#define rindex strrchr
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/*
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* get option letter from argument vector
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*/
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int opterr = 1, /* if error message should be printed */
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optind = 1, /* index into parent argv vector */
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optopt; /* character checked for validity */
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char *optarg; /* argument associated with option */
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#define BADCH (int)'?'
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#define EMSG ""
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int getopt(int nargc, char **nargv, char *ostr)
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{
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static char *place = EMSG; /* option letter processing */
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register char *oli; /* option letter list index */
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char *p;
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if (!*place) { /* update scanning pointer */
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if (optind >= nargc || *(place = nargv[optind]) != '-') {
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place = EMSG;
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return(EOF);
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}
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if (place[1] && *++place == '-') { /* found "--" */
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++optind;
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place = EMSG;
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return(EOF);
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}
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} /* option letter okay? */
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if ((optopt = (int)*place++) == (int)':' ||
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!(oli = index(ostr, optopt))) {
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/*
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* if the user didn't specify '-' as an option,
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* assume it means EOF.
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*/
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if (optopt == (int)'-')
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return(EOF);
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if (!*place)
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++optind;
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if (opterr) {
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if (!(p = rindex(*nargv, '/')))
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p = *nargv;
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else
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++p;
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(void)fprintf(stderr, "%s: illegal option -- %c\n",
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p, optopt);
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}
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return(BADCH);
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}
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if (*++oli != ':') { /* don't need argument */
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optarg = NULL;
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if (!*place)
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++optind;
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}
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else { /* need an argument */
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if (*place) /* no white space */
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optarg = place;
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else if (nargc <= ++optind) { /* no arg */
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place = EMSG;
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if (!(p = rindex(*nargv, '/')))
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p = *nargv;
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else
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++p;
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if (opterr)
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(void)fprintf(stderr,
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"%s: option requires an argument -- %c\n",
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p, optopt);
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return(BADCH);
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}
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else /* white space */
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optarg = nargv[optind];
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place = EMSG;
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++optind;
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}
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return(optopt); /* dump back option letter */
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}
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