/*******************************************************************
*                                                                  *
*             This software is part of the ast package             *
*                Copyright (c) 1982-2004 AT&T Corp.                *
*        and it may only be used by you under license from         *
*                       AT&T Corp. ("AT&T")                        *
*         A copy of the Source Code Agreement is available         *
*                at the AT&T Internet web site URL                 *
*                                                                  *
*       http://www.research.att.com/sw/license/ast-open.html       *
*                                                                  *
*    If you have copied or used this software without agreeing     *
*        to the terms of the license you are infringing on         *
*           the license and copyright and are violating            *
*               AT&T's intellectual property rights.               *
*                                                                  *
*            Information and Software Systems Research             *
*                        AT&T Labs Research                        *
*                         Florham Park NJ                          *
*                                                                  *
*                David Korn <dgk@research.att.com>                 *
*                                                                  *
*******************************************************************/
#pragma prototyped
/*
 * getopts  optstring name [arg...]
 *
 *   David Korn
 *   AT&T Labs
 *   research!dgk
 *
 */

#include	"defs.h"
#include	"variables.h"
#include	<error.h>
#include	<nval.h>
#include	"builtins.h"

static int infof(Opt_t* op, Sfio_t* sp, const char* s, Optdisc_t* dp)
{
	if(nv_search(s,sh.fun_tree,0))
	{
		int savtop = staktell();
		char *savptr = stakfreeze(0);
		stakputc('$');
		stakputc('(');
		stakputs(s);
		stakputc(')');
		sfputr(sp,sh_mactry(stakfreeze(1)),-1);
		stakset(savptr,savtop);
	}
        return(1);
}

int	b_getopts(int argc,char *argv[],void *extra)
{
	register char *options=error_info.context->id;
	register Namval_t *np;
	register int flag, mode, r=0;
	register Shell_t *shp = (Shell_t*)extra;
	char value[2], key[2];
	int jmpval;
	struct checkpt buff, *pp;
        Optdisc_t disc;
        memset(&disc, 0, sizeof(disc));
        disc.version = OPT_VERSION;
        disc.infof = infof;
	value[1] = 0;
	key[1] = 0;
	while((flag = optget(argv,sh_optgetopts))) switch(flag)
	{
	    case 'a':
		options = opt_info.arg;
		break;
	    case ':':
		errormsg(SH_DICT,2, "%s", opt_info.arg);
		break;
	    case '?':
		errormsg(SH_DICT,ERROR_usage(2), "%s", opt_info.arg);
		break;
	}
	argv += opt_info.index;
	argc -= opt_info.index;
	if(error_info.errors || argc<2)
		errormsg(SH_DICT,ERROR_usage(2), "%s", optusage((char*)0));
	error_info.context->flags |= ERROR_SILENT;
	error_info.id = options;
	options = argv[0];
	np = nv_open(argv[1],shp->var_tree,NV_NOASSIGN|NV_VARNAME);
	if(argc>2)
	{
		argv +=1;
		argc -=1;
	}
	else
	{
		argv = shp->st.dolv;
		argc = shp->st.dolc;
	}
	opt_info.index = shp->st.optindex;
	opt_info.offset = shp->st.optchar;
	if(mode= (*options==':'))
		options++;
	sh_pushcontext(&buff,1);
	jmpval = sigsetjmp(buff.buff,0);
	if(jmpval)
	{
		sh_popcontext(&buff);
		pp = (struct checkpt*)shp->jmplist;
		pp->mode = SH_JMPERREXIT;
		sh_exit(2);
	}
        opt_info.disc = &disc;
	switch(opt_info.index>=0 && opt_info.index<=argc?(opt_info.num= LONG_MIN,flag=optget(argv,options)):0)
	{
	    case '?':
		if(mode==0)
			errormsg(SH_DICT,ERROR_usage(2), "%s", opt_info.arg);
		opt_info.option[1] = '?';
		/* FALL THRU */
	    case ':':
		key[0] = opt_info.option[1];
		if(strmatch(opt_info.arg,"*unknown*"))
			flag = '?';
		if(mode)
			opt_info.arg = key;
		else
		{
			errormsg(SH_DICT,2, "%s", opt_info.arg);
			opt_info.arg = 0;
			flag = '?';
		}
		*(options = value) = flag;
		shp->st.opterror = 1;
		if (opt_info.offset != 0 && !argv[opt_info.index][opt_info.offset])
		{
			opt_info.offset = 0;
			opt_info.index++;
		}
		break;
	    case 0:
		if(shp->st.opterror)
		{
			char *com[2];
			com[0] = "-?";
			com[1] = 0;
			flag = opt_info.index;
			opt_info.index = 0;
			optget(com,options);
			opt_info.index = flag;
			if(!mode && strchr(options,' '))
				errormsg(SH_DICT,ERROR_usage(2), "%s", optusage((char*)0));
		}
		opt_info.arg = 0;
		options = value;
		*options = '?';
		r=1;
		opt_info.offset = 0;
		break;
	    default:
		options = opt_info.option + (*opt_info.option!='+');
	}
	error_info.context->flags &= ~ERROR_SILENT;
	shp->st.optindex = opt_info.index;
	shp->st.optchar = opt_info.offset;
	nv_putval(np, options, 0);
	nv_close(np);
	np = nv_open(nv_name(OPTARGNOD),shp->var_tree,NV_NOSCOPE);
	if(opt_info.num != LONG_MIN)
	{
		Sfdouble_t d = opt_info.number;
		nv_putval(np, (char*)&d, NV_INTEGER|NV_DOUBLE|NV_LONG|NV_RDONLY);
	}
	else
		nv_putval(np, opt_info.arg, NV_RDONLY);
	nv_close(np);
	sh_popcontext(&buff);
        opt_info.disc = 0;
	return(r);
}

