qse/ase/utl/getopt.c
2008-03-19 00:29:25 +00:00

129 lines
3.4 KiB
C

/*
* $Id: getopt.c 142 2008-03-18 06:29:25Z baconevi $
*
* {License}
*/
#include <ase/utl/getopt.h>
#include <ase/cmn/str.h>
/*
* Copyright (c) 1987-2002 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:
*
* A. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* B. 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.
* C. Neither the names of the copyright holders 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 COPYRIGHT HOLDERS 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BADCH ASE_T('?')
#define BADARG ASE_T(':')
#define EMSG ASE_T("")
#define optstr opt->str
#define optarg opt->arg
#define optind opt->ind
#define optopt opt->opt
#define place opt->cur
ase_cint_t ase_getopt (int argc, ase_char_t* const* argv, ase_opt_t* opt)
{
ase_char_t* oli; /* option letter list index */
if (place == ASE_NULL)
{
place = EMSG;
optind = 1;
}
if (*place == ASE_T('\0'))
{
/* update scanning pointer */
if (optind >= argc || *(place = argv[optind]) != ASE_T('-'))
{
place = EMSG;
return ASE_CHAR_EOF;
}
if (place[1] != ASE_T('\0') && *++place == ASE_T('-'))
{
/* found "--" */
++optind;
place = EMSG;
return ASE_CHAR_EOF;
}
} /* option letter okay? */
if ((optopt = *place++) == ASE_T(':') ||
(oli = ase_strchr(optstr, optopt)) == ASE_NULL)
{
/*
* if the user didn't specify '-' as an option,
* assume it means EOF.
*/
if (optopt == (int)'-') return ASE_CHAR_EOF;
if (*place == ASE_T('\0')) ++optind;
return BADCH;
}
if (*++oli != ASE_T(':'))
{
/* don't need argument */
optarg = ASE_NULL;
if (*place == ASE_T('\0')) ++optind;
}
else
{
/* need an argument */
if (*place != ASE_T('\0'))
{
/* no white space */
optarg = place;
}
else if (argc <= ++optind)
{
/* no arg */
place = EMSG;
/*if (*optstr == ASE_T(':'))*/ return BADARG;
/*return BADCH;*/
}
else
{
/* white space */
optarg = argv[optind];
}
place = EMSG;
++optind;
}
return optopt; /* dump back option letter */
}