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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: Call fseek to move a file pointer to the start of a file,
** a position offset from the start, a position offset from the
** current position, and a position offset from the end of the
** file. Check that the file pointer is at the correct position
** after each seek.
**
**
**==========================================================================*/
#include <palsuite.h>
const char filename[] = "testfile.txt";
static BOOL Cleanup(HANDLE hFile)
{
BOOL result= TRUE;
if (fclose((PAL_FILE*)hFile))
{
Trace("fseek: ERROR -> Unable to close file \"%s\".\n",
filename);
result= FALSE;
}
if (!DeleteFileA(filename))
{
result= FALSE;
Trace("fseek: ERROR -> Unable to delete file \"%s\". ",
"GetLastError returned %u.\n",
filename,
GetLastError());
}
return result;
}
int __cdecl main(int argc, char **argv)
{
char outBuf[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char inBuf[20];
FILE * fp;
int size = ( sizeof(outBuf)/sizeof(char) ) - 1;
if (PAL_Initialize(argc, argv))
{
return FAIL;
}
/*create the file*/
fp = fopen(filename, "w");
if (fp == NULL)
{
Fail("Unable to open a file for write.\n");
}
if(fprintf(fp, outBuf) != size)
{
Trace("Unable to write to %s.\n", filename);
Cleanup(fp);
Fail("");
}
if (fclose(fp) != 0)
{
Trace("Unable to close newly written file.\n");
if (!DeleteFileA(filename))
{
Trace("fseek: ERROR -> Unable to delete file \"%s\". ",
"GetLastError returned %u.\n",
filename,
GetLastError());
}
Fail("");
}
fp = fopen(filename, "r");
if (fp == NULL)
{
if (!DeleteFileA(filename))
{
Trace("_putw: ERROR -> Unable to delete file \"%s\". ",
"GetLastError returned %u.\n",
filename,
GetLastError());
}
Fail("Unable to open a file for read.\n");
}
/*seek to the start*/
if (fseek(fp, 0, SEEK_SET) != 0)
{
Cleanup(fp);
Fail("fseek failed when seeking the start of a file.\n");
}
if (fgets(inBuf, 11, fp) != inBuf)
{
Cleanup(fp);
Fail("Unable to read from file after using fseek to move to the start.\n");
}
if (strncmp(inBuf, outBuf, 10) != 0)
{
Cleanup(fp);
Fail("fseek was asked to seek the start of a file,"
"but didn't get there.\n");
}
/*Seek with an offset from the start*/
if (fseek(fp, 10, SEEK_SET) != 0)
{
Cleanup(fp);
Fail("fseek failed when called with SEEK_SET and a positive offset.\n");
}
if (fgets(inBuf, 6, fp) != inBuf)
{
Cleanup(fp);
Fail("fgets failed after feek was called with SEEK_SET"
"and a positive offset.\n");
}
if (strncmp(inBuf, "ABCDE", 5) != 0)
{
Cleanup(fp);
Fail("fseek did not move to the correct position when passed SEEK_SET"
" and a positive offset.\n");
}
/*now move backwards and read the same string*/
if (fseek(fp, -5, SEEK_CUR) != 0)
{
Cleanup(fp);
Fail("fseek failed when passed SEEK_CUR and a negative offset.\n");
}
if (fgets(inBuf, 6, fp) != inBuf)
{
Cleanup(fp);
Fail("fgets failed after fseek was called with SEEK_CUR and a "
"negative offset.\n");
}
if (strncmp(inBuf, "ABCDE", 5) != 0)
{
Cleanup(fp);
Fail("fseek did not move to the correct position when called with"
" SEEK_CUR and a negative offset.\n");
}
/*Try seeking relative to the end of the file.*/
if (fseek(fp, -10, SEEK_END) != 0)
{
Cleanup(fp);
Fail("fseek failed when called with SEEK_END and a negative"
" offset.\n");
}
if (fgets(inBuf, 2, fp) != inBuf)
{
Cleanup(fp);
Fail("fgets failed after fseek was called with SEEK_END and a "
"negative offset\n");
}
if (strncmp(inBuf, "Q", 1) != 0)
{
Cleanup(fp);
Fail("fseek did not move to the correct position when called with "
"SEEK_END and a negative offset.\n");
}
/*close the file*/
if(!Cleanup(fp))
{
Fail("");
}
PAL_Terminate();
return PASS;
}
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