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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*=====================================================================
**
** Source: test1.c
**
** Purpose: Tests the PAL implementation of the fread function.
** Open a file in READ mode, and then try to read all
** the characters, more than all the characters,
** 0 characters and 0 sized characters and check that
** the return values are correct.
**
** Depends:
** fopen
** fseek
** fclose
**
**
**===================================================================*/
/* Note: testfile should exist in the directory with 15 characters
in it ... something got lost if it isn't here.
*/
/* Note: Under win32, fread() crashes when passed NULL. The test to ensure that
it returns 0 has been removed to reflect this.
*/
#include <palsuite.h>
int __cdecl main(int argc, char **argv)
{
const char filename[] = "testfile";
char buffer[128];
FILE * fp = NULL;
int result;
if (0 != PAL_Initialize(argc, argv))
{
return FAIL;
}
/* Open a file in READ mode */
if((fp = fopen(filename, "r")) == NULL)
{
Fail("Unable to open a file for reading. Is the file "
"in the directory? It should be.");
}
/* Read 15 characters from the file. The file has exactly this many
in it.
*/
if((result = fread(buffer,1,15,fp)) == 0)
{
Fail("ERROR: Zero characters read from the file. It should have "
"15 characters in it.");
}
if(result != 15)
{
Fail("ERROR: The fread function should have returned that it read "
"in 15 characters from the file. But it indicates having "
"read %i characters.",result);
}
/* Go back to the start of the file */
if(fseek(fp, 0, SEEK_SET))
{
Fail("ERROR: fseek failed, and this test depends on it.");
}
/* Attempt to read 17 characters, the return should still be 15 */
if((result = fread(buffer,1,17,fp)) == 0)
{
Fail("ERROR: Zero characters read from the file. It should have "
"15 characters in it. Though, it attempted to read 17.");
}
if(result != 15)
{
Fail("ERROR: The fread function should have returned that it read "
"in 15 characters from the file. "
"But it indicates having read %i characters.",result);
}
/* Back to the start of the file */
if(fseek(fp, 0, SEEK_SET))
{
Fail("ERROR: fseek failed, and this test depends on it.");
}
/* Read 0 characters and ensure the function returns 0 */
if((result = fread(buffer,1,0,fp)) != 0)
{
Fail("ERROR: The return value should be 0, as we attempted to "
"read 0 characters.");
}
/* Read characters of 0 size and ensure the return value is 0 */
if((result = fread(buffer,0,5,fp)) != 0)
{
Fail("ERROR: The return value should be 0, as we attempted to "
"read 0 sized data.");
}
/* Close the file */
if(fclose(fp))
{
Fail("ERROR: fclose failed. Test depends on it.");
}
/* Read 5 characters of 1 size from a closed file pointer
and ensure the return value is 0
*/
if((result = fread(buffer,1,5,fp)) != 0)
{
Fail("ERROR: The return value should be 0, as we attempted to "
"read data from a closed file pointer.");
}
PAL_Terminate();
return PASS;
}
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