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/*
* 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 "h4getopt.h"
#include <stdio.h>
#include <string.h>
int h4opterr = 1; /* if error message should be printed */
int h4optind = 1; /* index into parent argv vector */
int h4optopt = 0; /* character checked for validity */
int h4optreset = 0; /* reset getopt */
char *h4optarg = NULL; /* argument associated with option */
#define BADCH (int)'?'
#define BADARG (int)':'
#define EMSG ""
/*
* getopt --
* Parse argc/argv argument vector.
*/
int
h4getopt(int argc, char *const argv[], const char *optstring)
{
static char *place = EMSG; /* option letter processing */
char *oli; /* option letter list index */
if (h4optreset || *place == 0) { /* update scanning pointer */
h4optreset = 0;
place = argv[h4optind];
if (h4optind >= argc || *place++ != '-') {
/* Argument is absent or is not an option */
place = EMSG;
return -1;
}
h4optopt = *place++;
if (h4optopt == '-' && *place == 0) {
/* "--" => end of options */
++h4optind;
place = EMSG;
return -1;
}
if (h4optopt == 0) {
/* Solitary '-', treat as a '-' option
if the program (eg su) is looking for it. */
place = EMSG;
if (strchr(optstring, '-') == NULL)
return -1;
h4optopt = '-';
}
}
else
h4optopt = *place++;
/* See if option letter is one the caller wanted... */
if (h4optopt == ':' || (oli = strchr(optstring, h4optopt)) == NULL) {
if (*place == 0)
++h4optind;
if (h4opterr && *optstring != ':')
fprintf(stderr, "unknown option -- %c\n", h4optopt);
return BADCH;
}
/* Does this option need an argument? */
if (oli[1] != ':') {
/* don't need argument */
h4optarg = NULL;
if (*place == 0)
++h4optind;
}
else {
/* Option-argument is either the rest of this argument or the
entire next argument. */
if (*place)
h4optarg = place;
else if (argc > ++h4optind)
h4optarg = argv[h4optind];
else {
/* option-argument absent */
place = EMSG;
if (*optstring == ':')
return BADARG;
if (h4opterr)
fprintf(stderr, "option requires an argument -- %c\n", h4optopt);
return BADCH;
}
place = EMSG;
++h4optind;
}
return h4optopt; /* return option letter */
}
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