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//---------------------------------------------------------------------------------
//
// Little Color Management System
// Copyright (c) 1998-2023 Marti Maria Saguer
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//---------------------------------------------------------------------------------
//
// xgetopt.c -- loosely based on System V getopt()
//
// option ::= SW [optLetter]* [argLetter space* argument]
//
#include <string.h>
#include <stdio.h>
int xoptind = 1;
char *xoptarg;
static char *nextArg = NULL;
#define SW '-'
int xgetopt(int argc, char* argv[], char* optionS)
{
unsigned char ch;
char* optP;
if (argc > xoptind)
{
if (nextArg == NULL)
{
if ((nextArg = argv[xoptind]) == NULL || *(nextArg++) != SW) goto end_eof;
}
if ((ch = *(nextArg++)) == 0)
{
xoptind++;
goto end_eof;
}
if (ch == ':' || (optP = strchr(optionS, ch)) == NULL)
goto end_error;
if (*(++optP) == ':')
{
xoptind++;
if (*nextArg == 0)
{
if (argc <= xoptind) goto end_error;
nextArg = argv[xoptind++];
}
xoptarg = nextArg;
nextArg = NULL;
}
else
{
if (*nextArg == 0)
{
xoptind++;
nextArg = NULL;
}
xoptarg = NULL;
}
return ch;
}
end_eof:
xoptarg = nextArg = NULL;
return EOF;
end_error:
xoptarg = NULL;
return '?';
}
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