/*
 *
 *   Copyright (c) International Business Machines  Corp., 2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/* Ported from SPIE, section2/iosuite/stream4.c, by Airong Zhang */

/*======================================================================
	=================== TESTPLAN SEGMENT ===================
>KEYS:  < fwrite() fread()
>WHAT:  < 1) Ensure fwrite appends data to stream.
	< 2) Ensure fread and fwrite return values are valid.
>HOW:   < 1) Open a file, write to it, and then check it.
	< 2) Fwrite a know quanity, check return value.
	<    Fread a know quanity, check return value.
>BUGS:  < 
======================================================================*/

#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "test.h"
#include "usctest.h"

char *TCID = "stream04";
int TST_TOTAL = 1;
extern int Tst_count;
int     local_flag;

#define PASSED 1
#define FAILED 0


char progname[] = "stream04()" ;
char tempfile1[40]="";
long ftell();

/*--------------------------------------------------------------------*/
int main(int ac, char *av[])
{
	FILE *stream;
	char *junk="abcdefghijklmnopqrstuvwxyz";
	char *inbuf;
	int ret;

        int lc;                 /* loop counter */
        char *msg;              /* message returned from parse_opts */

         /*
          * parse standard options
          */
        if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
                         tst_resm(TBROK, "OPTION PARSING ERROR - %s", msg);
                 tst_exit();
                 /*NOTREACHED*/
         }
	tst_tmpdir();
	for (lc = 0; TEST_LOOPING(lc); lc++) {

		local_flag = PASSED;

		sprintf(tempfile1, "stream04.%d", getpid());
	/*--------------------------------------------------------------------*/
	//block0:	
		if(creat(tempfile1,0666) < 0) {
			tst_resm(TFAIL,"\tcreat failed\n");
			tst_exit();
		}
		if((stream=fopen(tempfile1,"a+")) == NULL) {
			tst_resm(TFAIL,"\tfopen a+ failed\n");
			tst_exit();
		}
		/* write something and check */
		if((ret=fwrite(junk,sizeof(*junk),strlen(junk),stream)) == 0) {
			tst_resm(TFAIL,"\tfwrite failed\n");
			tst_exit();
		}

		if((size_t)ret != strlen(junk)) {
			tst_resm(TFAIL,"strlen(junk),return value from fwrite");
			local_flag = FAILED;
		}

		fclose(stream);
		if((stream=fopen(tempfile1,"r+")) == NULL) {
			tst_resm(TFAIL,"\tfopen r+ failed\n");
			tst_exit();
		}
		if ( (inbuf=(char *)malloc(strlen(junk))) == 0) {
			tst_resm(TBROK, "test failed because of malloc\n");
			tst_exit();
		}
		if((ret=fread(inbuf,sizeof(*junk),strlen(junk),stream)) == 0) {
			tst_resm(TFAIL,"\tfread failed\n");
			tst_exit();
		}
		if((size_t)ret != strlen(junk)) {
			tst_resm(TFAIL,"strlen(junk),return value from fread");
			local_flag = FAILED;
		}
		fclose(stream);
		if (local_flag == PASSED) {
			tst_resm(TPASS, "Test passed.\n");
		} else {
			tst_resm(TFAIL, "Test failed.\n");
		}
	/*--------------------------------------------------------------------*/
		unlink(tempfile1);
	} /* end for */
	tst_rmdir();
	tst_exit();
	return(0);
}