1 files changed, 32 insertions, 0 deletions
diff --git a/src/pdclib/functions/stdio/ungetc.c b/src/pdclib/functions/stdio/ungetc.c
new file mode 100644
index 0000000..dc5260b
--- /dev/null
+++ b/src/pdclib/functions/stdio/ungetc.c
@@ -0,0 +1,32 @@
+/* ungetc( int, FILE * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdio.h>
+
+#ifndef REGTEST
+
+int ungetc( int c, struct _PDCLIB_file_t * stream )
+{
+    if ( c == EOF || stream->ungetidx == _PDCLIB_UNGETCBUFSIZE )
+    {
+        return -1;
+    }
+    return stream->ungetbuf[stream->ungetidx++] = (unsigned char) c;
+}
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    /* Testing covered by ftell.c */
+    return TEST_RESULTS;
+}
+
+#endif