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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: test2.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 strings read in are correct.
**
** Depends:
** fopen
** fseek
** fclose
** strcmp
** memset
**
**
**===================================================================*/
/* Note: testfile should exist in the directory with 15 characters
in it ... something got lost if it isn't here.
*/
/* Note: The behaviour in win32 is to crash if a NULL pointer is passed to
fread, so the test to check that it returns 0 has been removed.
*/
#include <palsuite.h>
int __cdecl main(int argc, char **argv)
{
const char filename[] = "testfile";
char buffer[128];
FILE * fp = NULL;
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. Then check to see that the data read in is correct.
Note: The 'testfile' should have "This is a test." written in it.
*/
memset(buffer,'\0',128);
fread(buffer,1,15,fp);
if(strcmp(buffer,"This is a test.") != 0)
{
Fail("ERROR: The data read in should have been "
"'This is a test.' but, the buffer contains '%s'.",
buffer);
}
/* 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 same 15 characters should
be in the buffer.
*/
memset(buffer,'\0',128);
fread(buffer,1,17,fp);
if(strcmp(buffer,"This is a test.") != 0)
{
Fail("ERROR: The data read in should have been "
"'This is a test.' but, the buffer contains '%s'.",
buffer);
}
/* 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 buffer is empty */
memset(buffer,'\0',128);
fread(buffer,1,0,fp);
if(strcmp(buffer,"\0") != 0)
{
Fail("ERROR: The data read in should have been "
"NULL but, the buffer contains '%s'.",
buffer);
}
/* Read characters of 0 size and ensure the buffer is empty */
memset(buffer,'\0',128);
fread(buffer,0,5,fp);
if(strcmp(buffer,"\0") != 0)
{
Fail("ERROR: The data read in should have been "
"NULL but, the buffer contains '%s'.",
buffer);
}
/* 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 buffer is empty
*/
memset(buffer,'\0',128);
fread(buffer,1,5,fp);
if(strcmp(buffer,"\0") != 0)
{
Fail("ERROR: The data read in should have been "
"NULL but, the buffer contains '%s'.",
buffer);
}
PAL_Terminate();
return PASS;
}
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