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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: ungetc.c (test 2)
**
** Purpose: Tests the PAL implementation of the ungetc function
**
** Dependencies:
** fopen
** fread
** fclose
** fseek
** getc
**
**
**===================================================================*/
#include <palsuite.h>
int __cdecl main(int argc, char *argv[])
{
const char szFileName[] = {"test2.txt"};
const char szNewString[] = {"bar bar"};
char szBuffer[MAX_PATH];
FILE* pFile = NULL;
int nChar = 32; /* space */
int i = 0;
int nRc = 0;
size_t nCount = 0;
if (0 != PAL_Initialize(argc,argv))
{
return FAIL;
}
memset(szBuffer, 0, MAX_PATH);
/*
** open the file in write only mode, populate it and
** attempt to push an unread character back on the stream
*/
/* open the file for read */
pFile = fopen(szFileName, "r");
if (pFile == NULL)
{
Fail("ungetc: ERROR -> fopen failed to open the file \"%s\""
" as read-only.n",
szFileName);
}
/*
** Call getc to get the first char and ungetc to put
** it back. getc should read it again.
*/
/* read a character */
if ((nChar = getc(pFile)) == EOF)
{
Trace("ungetc: ERROR -> getc encountered an error reading.\n");
if (fclose(pFile) != 0)
{
Trace("ungetc: ERROR -> fclose failed to close the file.\n");
}
Fail("");
}
/* put it back */
if ((nRc = ungetc(nChar, pFile)) == EOF)
{
Trace("ungetc: ERROR -> ungetc failed to push '%c' back onto the"
" stream.\n");
if (fclose(pFile) != 0)
{
Trace("ungetc: ERROR -> fclose failed to close the file.\n");
}
Fail("");
}
/* read it again... hopefully */
if (((nChar = getc(pFile)) == EOF) || (nChar != nRc))
{
Trace("ungetc: ERROR -> getc encountered an error reading.\n");
if (fclose(pFile) != 0)
{
Trace("ungetc: ERROR -> fclose failed to close the file.\n");
}
Fail("");
}
/*
** test multiple ungetcs by replacing "foo" in the stream with "bar"
*/
/* move the file pointer back to the beginning of the file */
if (fseek(pFile, 0, SEEK_SET) != 0)
{
Trace("ungetc: ERROR -> fseek failed to move the file pointer to the "
"beginning of the file. GetLastError returned %ld\n",
GetLastError());
if (fclose(pFile) != 0)
{
Trace("ungetc: ERROR -> fclose failed to close the file.\n");
}
Fail("");
}
/* read a few characters */
for (i = 0; i < 3; i++)
{
if (getc(pFile) == EOF)
{
Trace("ungetc: ERROR -> getc encountered an error reading. "
"GetLastError returned %ld\n",
GetLastError());
if (fclose(pFile) != 0)
{
Trace("ungetc: ERROR -> fclose failed to close the file.\n");
}
Fail("");
}
}
/* we just read "foo" so push "bar" back on the stream */
for (i = 2; i >= 0; i--)
{
if ((nRc = ungetc(szNewString[i], pFile)) == EOF)
{
Trace("ungetc: ERROR -> ungetc failed to push '%c' back onto the"
" stream.\n");
if (fclose(pFile) != 0)
{
Trace("ungetc: ERROR -> fclose failed to close the file.\n");
}
Fail("");
}
}
/* read the new and improved stream - I use szNewString because it
is correct length */
nCount = fread(szBuffer, sizeof(char), strlen(szNewString), pFile);
/* did we get the right number of characters?*/
if (nCount != strlen(szNewString))
{
Trace("ungetc: ERROR -> fread read %d characters from the stream but"
" %d characters were expected\n",
nRc,
strlen(szNewString));
if (fclose(pFile) != 0)
{
Trace("ungetc: ERROR -> fclose failed to close the file.\n");
}
Fail("");
}
/* did we get the right string? */
if (strcmp(szBuffer, szNewString) != 0)
{
Trace("ungetc: ERROR -> fread returned \"%s\" but \"%s\" was "
"expected\n",
szBuffer,
szNewString);
if (fclose(pFile) != 0)
{
Trace("ungetc: ERROR -> fclose failed to close the file.\n");
}
Fail("");
}
if (fclose(pFile) != 0)
{
Fail("ungetc: ERROR -> fclose failed to close the file.\n");
}
PAL_Terminate();
return PASS;
}
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