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/*
* getopt.C -- A getopt implementation.
*/
/*
* $Id: getopt.C,v 3.0.1.1 1994/01/24 13:58:40 ram Exp $
*
* Copyright (c) 1991-1993, Raphael Manfredi
*
* You may redistribute only under the terms of the Artistic Licence,
* as specified in the README file that comes with the distribution.
* You may reuse parts of this distribution only within the terms of
* that same Artistic Licence; a copy of which may be found at the root
* of the source tree for dist 3.0.
*
* Original Author: unknown, got this off net.sources
*
* $Log: getopt.C,v $
* Revision 3.0.1.1 1994/01/24 13:58:40 ram
* patch16: created
*
*/
#include "config.h"
#include <stdio.h>
#ifdef I_STRING
#include <string.h>
#else
#include <strings.h>
#endif
#include "confmagic.h" /* Remove if not metaconfig -M */
#ifndef HAS_GETOPT
/*
* Get option letter from argument vector
*/
int opterr = 1, /* Useless, never set or used */
optind = 1, /* Index into parent argv vector */
optopt; /* Character checked for validity */
char *optarg; /* Argument associated with option */
#define BADCH (int) '?'
#define EMSG ""
#define tell(s) \
do { \
fputs(*nargv, stderr); \
fputs(s, stderr); \
fputc(optopt, stderr); \
fputc('\n', stderr); \
return BADCH; \
} while (0)
/*
* getopt
*
* Parses command line flags and arguments. Given the original arguments
* via the (nargc, nargv) tuple, and a list of flags via 'ostr', it returns
* the next flag recognized, and sets the externally visible 'optarg'
* variable to point to the start of the flags's parameter, if any expected.
*
* When facing an invalid flag, getopt() returns '?'.
*
* The 'ostr' string is a list of allowed flag characters, optionally by ':'
* when the flag expects a parameter, which can immediately follow the
* flag or come as the next word.
*
* In any case, the 'optopt' variable is set upon return to the flag being
* looked at, whether it was a valid flag or not.
*/
V_FUNC(int getopt, (nargc, nargv, ostr)
int nargc /* Argument count */ NXT_ARG
char **nargv /* Argument vector */ NXT_ARG
char *ostr /* String specifying options */)
{
static char *place = EMSG; /* Option letter processing */
register1 char *oli; /* Option letter list index */
/*
* Update scanning pointer.
*/
if (!*place) {
if(
optind >= nargc ||
*(place = nargv[optind]) != '-' ||
!*++place
)
return EOF;
if (*place == '-') { /* Found "--", end option processing */
++optind;
return EOF;
}
}
/*
* Is option letter OK?
*/
if (
(optopt = (int)*place++) == (int)':' ||
!(oli = index(ostr,optopt))
) {
if (!*place) ++optind;
tell(": illegal option -- ");
}
/*
* Found a valid option, process it.
*/
if (*++oli != ':') { /* Don't need argument */
optarg = NULL;
if (!*place) ++optind;
} else { /* Need an argument */
if (*place) optarg = place; /* No white space */
else if (nargc <= ++optind) { /* No argument */
place = EMSG;
tell(": option requires an argument -- ");
} else
optarg = nargv[optind]; /* White space */
place = EMSG;
++optind;
}
return optopt; /* Dump back option letter */
}
#endif
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