X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fungetc.c;h=dd0295917e4af81cdee2334f33e4a90f73656e8e;hb=b1fc26afebd4d557ff89a44bc21767a8704c3809;hp=1bd7323ba80eb7345f26586de79d48912e386439;hpb=1d9d92ba957a0b8307c9a65c35867fde68e6533b;p=pdclib

diff --git a/functions/stdio/ungetc.c b/functions/stdio/ungetc.c
index 1bd7323..dd02959 100644
--- a/functions/stdio/ungetc.c
+++ b/functions/stdio/ungetc.c
@@ -1,20 +1,31 @@
-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * Public Domain C Library - http://pdclib.sourceforge.net
- * This code is Public Domain. Use, modify, and redistribute at will.
- * --------------------------------------------------------------------------*/
+/* ungetc( int, FILE * )
 
-int ungetc( int c, FILE * stream ) { /* TODO */ };
+   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
 
-/* PDPC code - unreviewed
+int ungetc( int c, struct _PDCLIB_file_t * stream )
 {
-    if ((stream->ungetCh != -1) || (c == EOF))
+    if ( c == EOF || stream->ungetidx == _PDCLIB_UNGETCBUFSIZE )
     {
-        return (EOF);
+        return -1;
     }
-    stream->ungetCh = (unsigned char)c;
-    stream->quickText = 0;
-    return ((unsigned char)c);
+    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