/****************************************************************
 *								*
 *	Copyright 2001, 2012 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 "io.h"
#include "iosp.h"
#include "iotimer.h"
#include "stringpool.h"
#include "op.h"
#include "ebc_xlat.h"

GBLREF io_pair		io_curr_device;
GBLREF spdesc		stringpool;
GBLREF io_desc		*active_device;
GBLREF boolean_t	gtm_utf8_mode;

error_def(ERR_TEXT);
error_def(ERR_RDFLTOOSHORT);
error_def(ERR_RDFLTOOLONG);

int op_readfl(mval *v, int4 length, int4 timeout)
{
	int4		stat;		/* status */
	size_t		cnt, insize, outsize;
	char		*start_ptr, *save_ptr;
	unsigned char	*temp_ch;
	int		b_length;

	if (timeout < 0)
		timeout = 0;
	/* Length is in units of characters, MAX_STRLEN and allocation unit in stp is bytes. Compute the worst case need in bytes.
	 * Worst case, every Unicode char is 4 bytes
	 */
	b_length = (!IS_UTF_CHSET(io_curr_device.in->ichset)) ? length : (length * 4);
	if (0 >= length)
		rts_error(VARLSTCNT(1) ERR_RDFLTOOSHORT);
	/* This check is more useful in "M" mode. For UTF-8 mode, checks have to be done while reading */
	if (MAX_STRLEN < length)
		rts_error(VARLSTCNT(1) ERR_RDFLTOOLONG);
	assert(stringpool.free >= stringpool.base);
	assert(stringpool.free <= stringpool.top);
	v->mvtype = MV_STR;
	v->str.len = 0;		/* Nothing kept from any old value */
	ENSURE_STP_FREE_SPACE(b_length + ESC_LEN);
	v->str.addr = (char *)stringpool.free;
	active_device = io_curr_device.in;
	stat = (io_curr_device.in->disp_ptr->readfl)(v, length, timeout);
	if (stringpool.free == (unsigned char *)v->str.addr)	/* BYPASSOK */
		stringpool.free += v->str.len;	/* see UNIX iott_readfl */
	assert((int4)v->str.len <= b_length);
	assert(stringpool.free <= stringpool.top);
#	if defined(KEEP_zOS_EBCDIC) || defined(VMS)
	if (DEFAULT_CODE_SET != active_device->in_code_set)
	{
		cnt = insize = outsize = v->str.len;
		assert(stringpool.free >= stringpool.base);
		ENSURE_STP_FREE_SPACE(cnt);
		temp_ch = stringpool.free;
		save_ptr = v->str.addr;
		start_ptr = (char *)temp_ch;
		stringpool.free += cnt;
		assert(stringpool.free >= stringpool.base);
		assert(stringpool.free <= stringpool.top);
		ICONVERT(active_device->input_conv_cd, (unsigned char **)&(v->str.addr), &insize, &temp_ch, &outsize);
		v->str.addr = start_ptr;
	}
#	endif
	active_device = 0;
	if (NO_M_TIMEOUT != timeout)
		return (stat);
	return FALSE;
}