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diff --git a/src/pal/tests/palsuite/c_runtime/ungetc/test1/ungetc.cpp b/src/pal/tests/palsuite/c_runtime/ungetc/test1/ungetc.cpp
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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 1)
+**
+** Purpose: Tests the PAL implementation of the ungetc function by calling
+** the function on a write-only file.
+**
+** Dependencies:
+** fopen
+** fclose
+** fseek
+**
+**
+**===================================================================*/
+
+#include <palsuite.h>
+
+
+int __cdecl main(int argc, char *argv[])
+{
+ char szFileName[] = {"test1.tmp"};
+ const char text[] =
+ {"The quick brown fox jumped over the lazy dog's back."};
+ FILE* pFile = NULL;
+ int nChar = 65; /* 'A' */
+ int nRc = 0;
+ int itemsExpected;
+ int itemsWritten;
+
+ if (0 != PAL_Initialize(argc,argv))
+ {
+ return FAIL;
+ }
+
+ /* create the file */
+ pFile = fopen(szFileName, "w");
+ if (pFile == NULL)
+ {
+ Fail("ungetc: ERROR -> fopen failed to create the file \"%s\""
+ " as write-only.\n",
+ szFileName);
+ }
+
+ /* write to the file */
+ itemsExpected = sizeof(text);
+ itemsWritten = fwrite(text, sizeof(text[0]), sizeof(text), pFile);
+ if (itemsWritten == 0)
+ {
+ Trace("ungetc: ERROR -> fwrite failed to write to the file \"%s\"\n",
+ szFileName);
+
+ if (fclose(pFile) != 0)
+ {
+ Fail("ungetc: ERROR -> fclose failed to close the file.\n");
+ }
+ Fail("");
+
+ }
+ else if (itemsWritten != itemsExpected)
+ {
+ Trace("ungetc: ERROR -> fwrite failed to write the correct number "
+ "of characters to the file \"%s\"\n",
+ szFileName);
+
+ if (fclose(pFile) != 0)
+ {
+ Fail("ungetc: ERROR -> fclose failed to close the file.\n");
+ }
+ Fail("");
+ }
+
+ /* Close the file */
+ if (fclose(pFile) != 0)
+ {
+ Fail("ungetc: ERROR -> fclose failed to close the file.\n");
+ }
+
+ /*
+ ** open the file in write only mode and
+ ** attempt to push an unread character back on the stream
+ */
+
+
+ /* open the file write-only */
+ pFile = fopen(szFileName, "a");
+ if (pFile == NULL)
+ {
+ Fail("ungetc: ERROR -> fopen failed to open the file \"%s\""
+ " as write-only.\n",
+ szFileName);
+ }
+
+ /* move the file pointer back to the beginning of the file */
+ if (fseek(pFile, 1, SEEK_SET) != 0)
+ {
+
+ Trace("ungetc: ERROR -> fseek failed to move the file pointer to the "
+ "beginning of the file.\n");
+ if (fclose(pFile) != 0)
+ {
+ Trace("ungetc: ERROR -> fclose failed to close the file.\n");
+ }
+ Fail("");
+ }
+
+ /* call ungetc on a write-only file which should fail */
+ if ((nRc = ungetc(nChar, pFile)) != EOF)
+ {
+ Trace("ungetc: ERROR -> ungetc returned \"%c\" when run on "
+ "an write-only file.\n", nChar);
+ 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;
+}