PDCLIB-16: Add _unlocked variations of all I/O routines; move work into these versions

[pdclib.old] / functions / stdio / ungetc.c

diff --git a/functions/stdio/ungetc.c b/functions/stdio/ungetc.c
index f15d8a3b8a66de75ab1bcff32a4085ddbcd0c945..45b8a92a73e9fc004146ad9d46aae51bd0e9d013 100644 (file)
--- a/functions/stdio/ungetc.c
+++ b/functions/stdio/ungetc.c
@@ -1,20 +1,41 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* $Id$ */
 
-int ungetc( int c, FILE * stream ) { /* TODO */ };
+/* ungetc( int, FILE * )
 
-/* PDPC code - unreviewed
+   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_unlocked( 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;
 }
-*/
+
+int ungetc( int c, struct _PDCLIB_file_t * stream )
+{
+    flockfile( stream );
+    int r = ungetc_unlocked( c, stream );
+    funlockfile( stream);
+    return r;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    /* Testing covered by ftell.c */
+    return TEST_RESULTS;
+}
+
+#endif