X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fungetc.c;h=001735b533c04361648b2c3eb5475cdced99faac;hb=526e9954c39f30819e421cb74e82aa59d5a41013;hp=fdafc9de1054f34ca1e5b09c42ea06507ecf59e2;hpb=e5112b619d1aae8ffc439389cfcbd3b2b4bd2454;p=pdclib

diff --git a/functions/stdio/ungetc.c b/functions/stdio/ungetc.c
index fdafc9d..001735b 100644
--- a/functions/stdio/ungetc.c
+++ b/functions/stdio/ungetc.c
@@ -12,8 +12,11 @@
 
 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 +26,7 @@ int ungetc( int c, struct _PDCLIB_file_t * stream )
 
 int main( void )
 {
-    TESTCASE( NO_TESTDRIVER );
+    /* Testing covered by ftell.c */
     return TEST_RESULTS;
 }