fix prompting

C/c_interface.c

@@ -2149,14 +2149,13 @@ X_API YAP_Term YAP_CopyTerm(Term t) {
 X_API char *YAP_WriteBuffer(Term t, char *buf, size_t sze, int flags) {
   CACHE_REGS
   seq_tv_t inp, out;
-  size_t length = sze;
-  char *b;
 
   BACKUP_MACHINE_REGS();
   inp.val.t = t;
   inp.type = YAP_STRING_TERM;
   out.type = YAP_STRING_CHARS;
   out.val.c = buf;
+  out.max = sze-1;
   out.enc = LOCAL_encoding;
   if (!Yap_CVT_Text(&inp, &out PASS_REGS))
     return NULL;

os/console.c

@@ -45,14 +45,12 @@ static int ConsolePutc(int, int);
 bool Yap_DoPrompt(StreamDesc *s) {
   if (s->status & Tty_Stream_f) {
     if (GLOBAL_Stream[0].status & Tty_Stream_f &&
-        s->name == GLOBAL_Stream[0].name)
-      return true;
-    if (GLOBAL_Stream[1].status & Tty_Stream_f &&
-        s->name == GLOBAL_Stream[1].name)
-      return true;
-    if (GLOBAL_Stream[2].status & Tty_Stream_f &&
-        s->name == GLOBAL_Stream[2].name)
-      return true;
+        s->name == GLOBAL_Stream[0].name &&
+        ((GLOBAL_Stream[1].status & Tty_Stream_f ||
+          s->name == GLOBAL_Stream[1].name) ||
+         (GLOBAL_Stream[2].status & Tty_Stream_f &&
+          s->name == GLOBAL_Stream[2].name)))
+      return LOCAL_newline;
   }
   return false;
 }
@@ -62,7 +60,11 @@ bool Yap_DoPrompt(StreamDesc *s) {
 int console_post_process_read_char(int ch, StreamDesc *s) {
   /* the character is also going to be output by the console handler */
   console_count_output_char(ch, GLOBAL_Stream + StdErrStream);
-  if (ch == '\n') {
+  if (ch == '\r') {
+    s->linepos = 0;
+    LOCAL_newline = true;
+} else
+ if (ch == '\n') {
     CACHE_REGS
     ++s->linecount;
     ++s->charcount;

os/iopreds.h

@@ -134,7 +134,8 @@ extern void Yap_InitSocketLayer(void);
 extern void Yap_InitMems(void);
 extern void Yap_InitConsole(void);
 extern void Yap_InitReadlinePreds(void);
-bool Yap_InitReadline(Term);
+extern bool Yap_InitReadline(Term);
+extern bool Yap_readline_clear_pending_input (StreamDesc *s);
 extern void Yap_InitChtypes(void);
 extern void Yap_InitCharsio(void);
 extern void Yap_InitFormat(void);

os/readline.c

@@ -251,6 +251,15 @@ void Yap_ReadlineFlush(int sno) {
   }
 }
 
+bool Yap_readline_clear_pending_input(StreamDesc *s) { 
+  rl_clear_pending_input();
+  if (s->u.irl.buf) {
+    free( ( void *)s->u.irl.buf ); 
+}
+    s->u.irl.ptr = s->u.irl.buf = NULL;
+    return true;
+}
+
 bool Yap_ReadlineOps(StreamDesc *s) {
   if (s->status & Tty_Stream_f) {
     if (GLOBAL_Stream[0].status & (Input_Stream_f | Tty_Stream_f) &&

os/streams.c

@@ -154,16 +154,14 @@ int Yap_GetFreeStreamD(void) { return GetFreeStreamD(); }
  */
  static bool clearInput(int sno)
  {
-#if HAVE_READLINE
-  return rl_clear_pending_input ();
-#endif
-#if ISATTY||_WIN32
-  int i = fileno(GLOBAL_Stream[sno].file);
-  if (!isatty(i))
-    return true;
+     if (!(GLOBAL_Stream[sno].status & Tty_Stream_f))
+     return true;
+#if USE_READLINE
+ if (GLOBAL_Stream[sno].status & Readline_Stream_f)
+  return Yap_readline_clear_pending_input (GLOBAL_Stream+sno);
 #endif
 #if HAVE_TCFLUSH
-  return tcflush(i, TCIOFLUSH) == 0;
+  return tcflush(fileno(GLOBAL_Stream[sno].file), TCIOFLUSH) == 0;
 #elif MSC_VER
   return fflush(GLOBAL_Stream[sno].file) == 0;
 #endif
@@ -1472,7 +1470,7 @@ void Yap_InitIOStreams(void) {
   Yap_InitCPred("set_output", 1, set_output, SafePredFlag | SyncPredFlag);
   Yap_InitCPred("$stream", 1, p_stream, SafePredFlag | TestPredFlag);
   Yap_InitCPred("$clear_input", 1, clear_input, SafePredFlag | TestPredFlag);
-  
+
 #if HAVE_SELECT
   Yap_InitCPred("stream_select", 3, p_stream_select,
                 SafePredFlag | SyncPredFlag);

pl/boot.yap

@@ -1392,8 +1392,8 @@ Command = (H --> B) ->
 
 
 '$enter_command'(Stream, Mod, Status) :-
+    '$clear_input'(Stream),
     prompt1(': '), prompt(_,'     '),
-	'$clear_input'(Stream),
 	Options = [module(Mod), syntax_errors(dec10),variable_names(Vars), term_position(Pos)],
     (
       Status == top