getopt.c
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上传日期:2022-05-23
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- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- /*
- * Copyright (c) 1987, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * 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. 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 "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: getopt.c,v 11.7 2002/01/11 15:51:28 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- int __db_getopt_reset; /* global reset for VxWorks. */
- int opterr = 1, /* if error message should be printed */
- optind = 1, /* index into parent argv vector */
- optopt, /* character checked for validity */
- optreset; /* reset getopt */
- char *optarg; /* argument associated with option */
- #undef BADCH
- #define BADCH (int)'?'
- #undef BADARG
- #define BADARG (int)':'
- #undef EMSG
- #define EMSG ""
- /*
- * getopt --
- * Parse argc/argv argument vector.
- *
- * PUBLIC: #ifndef HAVE_GETOPT
- * PUBLIC: int getopt __P((int, char * const *, const char *));
- * PUBLIC: #endif
- */
- int
- getopt(nargc, nargv, ostr)
- int nargc;
- char * const *nargv;
- const char *ostr;
- {
- static char *progname;
- static char *place = EMSG; /* option letter processing */
- char *oli; /* option letter list index */
- /*
- * VxWorks needs to be able to repeatedly call getopt from multiple
- * programs within its global name space.
- */
- if (__db_getopt_reset) {
- __db_getopt_reset = 0;
- opterr = optind = 1;
- optopt = optreset = 0;
- optarg = NULL;
- progname = NULL;
- place = EMSG;
- }
- if (!progname) {
- if ((progname = __db_rpath(*nargv)) == NULL)
- progname = *nargv;
- else
- ++progname;
- }
- if (optreset || !*place) { /* update scanning pointer */
- optreset = 0;
- if (optind >= nargc || *(place = nargv[optind]) != '-') {
- place = EMSG;
- return (EOF);
- }
- if (place[1] && *++place == '-') { /* found "--" */
- ++optind;
- place = EMSG;
- return (EOF);
- }
- } /* option letter okay? */
- if ((optopt = (int)*place++) == (int)':' ||
- !(oli = strchr(ostr, optopt))) {
- /*
- * if the user didn't specify '-' as an option,
- * assume it means EOF.
- */
- if (optopt == (int)'-')
- return (EOF);
- if (!*place)
- ++optind;
- if (opterr && *ostr != ':')
- (void)fprintf(stderr,
- "%s: illegal option -- %cn", progname, optopt);
- return (BADCH);
- }
- if (*++oli != ':') { /* don't need argument */
- optarg = NULL;
- if (!*place)
- ++optind;
- }
- else { /* need an argument */
- if (*place) /* no white space */
- optarg = place;
- else if (nargc <= ++optind) { /* no arg */
- place = EMSG;
- if (*ostr == ':')
- return (BADARG);
- if (opterr)
- (void)fprintf(stderr,
- "%s: option requires an argument -- %cn",
- progname, optopt);
- return (BADCH);
- }
- else /* white space */
- optarg = nargv[optind];
- place = EMSG;
- ++optind;
- }
- return (optopt); /* dump back option letter */
- }