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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: ftell.c (test 1)
**
** Purpose: Tests the PAL implementation of the ftell function.
**
**
**===================================================================*/
#include <palsuite.h>
FILE* pFile;
struct TESTS
{
long lDist;
int nFrom;
long lPosition;
};
/*************************************************
**
** Validate
**
** Purpose:
** Tests whether the move was successful. If
** it passes, it returns TRUE. If it fails
** it outputs some error messages and returns
** FALSE.
**
*************************************************/
BOOL Validate(long lExpected)
{
long lPos = -2;
if (((lPos = ftell(pFile)) == -1) || (lPos != lExpected))
{
Trace("ftell: ERROR -> ftell returned %ld when expecting %ld.\n",
lPos,
lExpected);
if (fclose(pFile) != 0)
{
Trace("ftell: ERROR -> fclose failed to close the file.\n");
}
return FALSE;
}
return TRUE;
}
/*************************************************
**
** MovePointer
**
** Purpose:
** Accepts the distance to move and the
** distance and calls fseek to move the file
** pointer. If the fseek fails, error messages
** are displayed and FALSE is returned. TRUE
** is returned on a successful fseek.
**
*************************************************/
BOOL MovePointer(long lDist, int nFrom)
{
/* move the file pointer*/
if (fseek(pFile, lDist, nFrom) != 0)
{
Trace("ftell: ERROR -> fseek failed to move the file pointer "
"%l characters.\n",
lDist);
if (fclose(pFile) != 0)
{
Trace("ftell: ERROR -> fclose failed to close the file.\n");
}
return FALSE;
}
return TRUE;
}
int __cdecl main(int argc, char *argv[])
{
const char szFileName[] = {"testfile.txt"};
long lPos = -1;
int i;
char szTempBuffer[256];
struct TESTS testCase[] =
{
{0, SEEK_SET, 0},
{10, SEEK_CUR, 10},
{-5, SEEK_CUR, 5},
{-2, SEEK_END, 50}
};
if (0 != PAL_Initialize(argc,argv))
{
return FAIL;
}
memset(szTempBuffer, 0, 256);
/* open the test file */
pFile = fopen(szFileName, "r");
if (pFile == NULL)
{
Fail("ftell: ERROR -> fopen failed to open the file \"%s\".\n");
}
/* loop through the test cases */
for (i = 0; i < (sizeof(testCase)/sizeof(struct TESTS)); i++)
{
if (MovePointer(testCase[i].lDist, testCase[i].nFrom) != TRUE)
{
Fail("");
}
else if (Validate(testCase[i].lPosition) != TRUE)
{
Fail("");
}
}
if (fclose(pFile) != 0)
{
Fail("ftell: ERROR -> fclose failed to close the file.\n");
}
/* lets just see if we can find out where we are in a closed stream... */
if ((lPos = ftell(pFile)) != -1)
{
Fail("ftell: ERROR -> ftell returned a valid position (%ld) on a "
"closed file handle\n",
lPos);
}
PAL_Terminate();
return PASS;
}
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