/*
 * Copyright (C) 1994-2021 Altair Engineering, Inc.
 * For more information, contact Altair at www.altair.com.
 *
 * This file is part of both the OpenPBS software ("OpenPBS")
 * and the PBS Professional ("PBS Pro") software.
 *
 * Open Source License Information:
 *
 * OpenPBS is free software. You can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * OpenPBS is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Commercial License Information:
 *
 * PBS Pro is commercially licensed software that shares a common core with
 * the OpenPBS software.  For a copy of the commercial license terms and
 * conditions, go to: (http://www.pbspro.com/agreement.html) or contact the
 * Altair Legal Department.
 *
 * Altair's dual-license business model allows companies, individuals, and
 * organizations to create proprietary derivative works of OpenPBS and
 * distribute them - whether embedded or bundled with other software -
 * under a commercial license agreement.
 *
 * Use of Altair's trademarks, including but not limited to "PBS™",
 * "OpenPBS®", "PBS Professional®", and "PBS Pro™" and Altair's logos is
 * subject to Altair's trademark licensing policies.
 */

/**
 * @file	disrst.c
 *
 * @par Synopsis:
 *	char *disrst(int stream, int *retval)
 *
 *	Gets a Data-is-Strings character string from <stream> and converts it
 *	into a null-terminated string, and returns a pointer to the result.  The
 *	character string in <stream> consists of an unsigned integer, followed
 *	by a number of characters determined by the unsigned integer.
 *
 *	*<retval> gets DIS_SUCCESS if everything works well.  It gets an error
 *	code otherwise.  In case of an error, the <stream> character pointer is
 *	reset, making it possible to retry with some other conversion strategy.
 *	In case of an error, the return value is NULL.
 */

#include <pbs_config.h> /* the master config generated by configure */

#include <assert.h>
#include <stddef.h>
#include <stdlib.h>

#ifndef NDEBUG
#include <string.h>
#endif

#include "dis.h"
#include "dis_.h"

/**
 * @brief
 *      Gets a Data-is-Strings signed integer from <stream>, converts it
 *      into a null-terminated string, and returns a pointer to the result.
 *
 * @param[in] stream - pointer to data stream
 * @param[out] retval - return value
 *
 * @return      string
 * @retval      converted value         success
 * @retval      0                       error
 *
 */

char *
disrst(int stream, int *retval)
{
	int locret;
	int negate;
	unsigned count;
	char *value = NULL;

	assert(retval != NULL);

	locret = disrsi_(stream, &negate, &count, 1, 0);
	if (locret == DIS_SUCCESS) {
		if (negate)
			locret = DIS_BADSIGN;
		else {
			value = (char *) malloc((size_t) count + 1);
			if (value == NULL)
				locret = DIS_NOMALLOC;
			else {
				if (dis_gets(stream, value,
					     (size_t) count) != (size_t) count)
					locret = DIS_PROTO;
#ifndef NDEBUG
				else if (memchr(value, 0, (size_t) count))
					locret = DIS_NULLSTR;
#endif
				else
					value[count] = '\0';
			}
		}
	}
	if ((*retval = locret) != DIS_SUCCESS && value != NULL) {
		free(value);
		value = NULL;
	}
	return (value);
}