109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)getopt.c 1.1 94/10/31 SMI";
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/* from 4.3BSD-tahoe 4.9 6/23/89 */
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#endif
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/*
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* Copyright (c) 1989 Sun Microsystems, Inc.
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*/
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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 the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* LINTLIBRARY */
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#include <stdio.h>
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#include <string.h>
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/*
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* get option letter from argument vector
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*/
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/* See lib/libc/gen/common/optind.c for next 3 definitions. */
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extern char *optarg; /* argument associated with option */
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extern int opterr; /* if error message should be printed */
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extern int optind; /* index into parent argv vector */
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int optopt; /* character checked for validity */
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#define BADCH (int)'?'
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#define EMSG ""
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getopt(nargc, nargv, ostr)
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int nargc;
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char **nargv, *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 = strchr(ostr, optopt))) {
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/*
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* For backwards compatibility: don't treat '-' as an
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* option letter unless caller explicitly asked for it.
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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 = strrchr(*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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} 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 = strrchr(*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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} 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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