/****************************************************************
 *								*
 *	Copyright 2010, 2011 Fidelity Information Services, Inc	*
 *								*
 *	This source code contains the intellectual property	*
 *	of its copyright holder(s), and is made available	*
 *	under a license.  If you do not know the terms of	*
 *	the license, please stop and do not read further.	*
 *								*
 ****************************************************************/

#include "mdef.h"

#include "gtm_string.h"

#include "compiler.h"
#include "opcode.h"
#include "toktyp.h"
#include "stringpool.h"
#include "gtm_iconv.h"
#include "io.h"
#include "iosp.h"
#ifdef __MVS__
#include "gtm_unistd.h"
#endif
#include "advancewindow.h"

GBLREF spdesc stringpool;

error_def(ERR_FCHARMAXARGS);
error_def(ERR_TEXT);

int f_zchar(oprtype *a, opctype op)
{
	boolean_t 	all_lits;
	char 		*c;
	unsigned char	*tmp_ptr;
	int 		argc, i;
	unsigned int	tmp_len;
	mval 		v;
	oprtype 	argv[CHARMAXARGS], *argp;
	triple 		*curr, *last, *root;
	DCL_THREADGBL_ACCESS;

	SETUP_THREADGBL_ACCESS;
	all_lits = TRUE;
	argp = &argv[0];
	argc = 0;
	for (;;)
	{
		if (EXPR_FAIL == expr(argp, MUMPS_INT))
			return FALSE;
		assert(TRIP_REF == argp->oprclass);
		if (OC_ILIT != argp->oprval.tref->opcode)
			all_lits = FALSE;
		argc++;
		argp++;
		if (TK_COMMA != TREF(window_token))
			break;
		advancewindow();
		if (argc >= CHARMAXARGS)
		{
			stx_error(ERR_FCHARMAXARGS);
			return FALSE;
		}
	}
	if (all_lits)
	{
		ENSURE_STP_FREE_SPACE(argc + 1);
		v.mvtype = MV_STR;
		v.str.addr = c = (char *)stringpool.free;
		argp = &argv[0];
		for (; argc > 0 ;argc--, argp++)
		{
			i = argp->oprval.tref->operand[0].oprval.ilit;
			if ((i >= 0) && (i < 256))	/* only true for single byte character set */
				*c++ = i;
		}
		*c = '\0';
		v.str.len = INTCAST(c - v.str.addr);
		stringpool.free = (unsigned char *)c;
		s2n(&v);
		*a = put_lit(&v);
		return TRUE;
	}
	root = maketriple(op);
	root->operand[0] = put_ilit(argc + 1);
	last = root;
	argp = &argv[0];
	for (; argc > 0; argc--, argp++)
	{
		curr = newtriple(OC_PARAMETER);
		curr->operand[0] = *argp;
		last->operand[1] = put_tref(curr);
		last = curr;
	}
	ins_triple(root);
	*a = put_tref(root);
	return TRUE;
}