NetBSD/lib/libc/stdlib/getopt.c

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/* $NetBSD: getopt.c,v 1.18 2000/12/20 15:59:51 christos Exp $ */
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/*
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* Copyright (c) 1987, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
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#else
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__RCSID("$NetBSD: getopt.c,v 1.18 2000/12/20 15:59:51 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <assert.h>
#include <errno.h>
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#include <stdio.h>
#include <string.h>
#include <unistd.h>
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#ifdef __weak_alias
__weak_alias(getopt,_getopt)
#endif
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extern char *__progname;
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int opterr = 1, /* if error message should be printed */
optind = 1, /* index into parent argv vector */
optopt, /* character checked for validity */
optreset; /* reset getopt */
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char *optarg; /* argument associated with option */
#define BADCH (int)'?'
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#define BADARG (int)':'
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#define EMSG ""
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/*
* getopt --
* Parse argc/argv argument vector.
*/
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int
getopt(nargc, nargv, ostr)
int nargc;
char * const nargv[];
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const char *ostr;
{
static char *place = EMSG; /* option letter processing */
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char *oli; /* option letter list index */
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_DIAGASSERT(nargv != NULL);
_DIAGASSERT(ostr != NULL);
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if (optreset || !*place) { /* update scanning pointer */
optreset = 0;
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if (optind >= nargc || *(place = nargv[optind]) != '-') {
place = EMSG;
return (-1);
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}
if (place[1] && *++place == '-' /* found "--" */
&& place[1] == '\0') {
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++optind;
place = EMSG;
return (-1);
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}
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} /* option letter okay? */
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if ((optopt = (int)*place++) == (int)':' ||
!(oli = strchr(ostr, optopt))) {
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/*
* if the user didn't specify '-' as an option,
* assume it means -1.
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*/
if (optopt == (int)'-')
return (-1);
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if (!*place)
++optind;
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if (opterr && *ostr != ':')
(void)fprintf(stderr,
"%s: illegal option -- %c\n", __progname, optopt);
return (BADCH);
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}
if (*++oli != ':') { /* don't need argument */
optarg = NULL;
if (!*place)
++optind;
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}
else { /* need an argument */
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if (*place) /* no white space */
optarg = place;
else if (nargc <= ++optind) { /* no arg */
place = EMSG;
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if (*ostr == ':')
return (BADARG);
if (opterr)
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(void)fprintf(stderr,
"%s: option requires an argument -- %c\n",
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__progname, optopt);
return (BADCH);
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}
else /* white space */
optarg = nargv[optind];
place = EMSG;
++optind;
}
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return (optopt); /* dump back option letter */
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}