X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fungetc.c;h=dd0295917e4af81cdee2334f33e4a90f73656e8e;hb=b1fc26afebd4d557ff89a44bc21767a8704c3809;hp=fdafc9de1054f34ca1e5b09c42ea06507ecf59e2;hpb=e5112b619d1aae8ffc439389cfcbd3b2b4bd2454;p=pdclib

diff --git a/functions/stdio/ungetc.c b/functions/stdio/ungetc.c
index fdafc9d..dd02959 100644
--- a/functions/stdio/ungetc.c
+++ b/functions/stdio/ungetc.c
@@ -1,5 +1,3 @@
-/* $Id$ */
-
 /* ungetc( int, FILE * )
 
    This file is part of the Public Domain C Library (PDCLib).
@@ -12,8 +10,11 @@
 
 int ungetc( int c, struct _PDCLIB_file_t * stream )
 {
-    /* TODO: Implement. */
-    return 0;
+    if ( c == EOF || stream->ungetidx == _PDCLIB_UNGETCBUFSIZE )
+    {
+        return -1;
+    }
+    return stream->ungetbuf[stream->ungetidx++] = (unsigned char) c;
 }
 
 #endif
@@ -23,7 +24,7 @@ int ungetc( int c, struct _PDCLIB_file_t * stream )
 
 int main( void )
 {
-    TESTCASE( NO_TESTDRIVER );
+    /* Testing covered by ftell.c */
     return TEST_RESULTS;
 }