1 files changed, 95 insertions, 18 deletions

diff --git a/cmd-line-utils/readline/history.c b/cmd-line-utils/readline/history.c
index bb1960d8d99..1ccf4db786c 100644
--- a/cmd-line-utils/readline/history.c
+++ b/cmd-line-utils/readline/history.c
@@ -1,6 +1,6 @@
 /* history.c -- standalone history library */
 
-/* Copyright (C) 1989-2003 Free Software Foundation, Inc.
+/* Copyright (C) 1989-2005 Free Software Foundation, Inc.
 
    This file contains the GNU History Library (the Library), a set of
    routines for managing the text of previously typed lines.
@@ -25,7 +25,9 @@
    you can call.  I think I have done that. */
 #define READLINE_LIBRARY
 
-#include "config_readline.h"
+#if defined (HAVE_CONFIG_H)
+#  include <config.h>
+#endif
 
 #include <stdio.h>
 
@@ -202,11 +204,27 @@ history_get (offset)
   int local_index;
 
   local_index = offset - history_base;
-  return (local_index >= history_length || local_index < 0 || !the_history)
+  return (local_index >= history_length || local_index < 0 || the_history == 0)
 		? (HIST_ENTRY *)NULL
 		: the_history[local_index];
 }
 
+HIST_ENTRY *
+alloc_history_entry (string, ts)
+     char *string;
+     char *ts;
+{
+  HIST_ENTRY *temp;
+
+  temp = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));
+
+  temp->line = string ? savestring (string) : string;
+  temp->data = (char *)NULL;
+  temp->timestamp = ts;
+
+  return temp;
+}
+
 time_t
 history_get_time (hist)
      HIST_ENTRY *hist;
@@ -288,11 +306,7 @@ add_history (string)
 	}
     }
 
-  temp = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));
-  temp->line = savestring (string);
-  temp->data = (char *)NULL;
-
-  temp->timestamp = hist_inittime ();
+  temp = alloc_history_entry (string, hist_inittime ());
 
   the_history[history_length] = (HIST_ENTRY *)NULL;
   the_history[history_length - 1] = temp;
@@ -326,6 +340,26 @@ free_history_entry (hist)
   free (hist);
   return (x);
 }
+
+HIST_ENTRY *
+copy_history_entry (hist)
+     HIST_ENTRY *hist;
+{
+  HIST_ENTRY *ret;
+  char *ts;
+
+  if (hist == 0)
+    return hist;
+
+  ret = alloc_history_entry (hist->line, (char *)NULL);
+
+  ts = hist->timestamp ? savestring (hist->timestamp) : hist->timestamp;
+  ret->timestamp = ts;
+
+  ret->data = hist->data;
+
+  return ret;
+}
   
 /* Make the history entry at WHICH have LINE and DATA.  This returns
    the old entry so you can dispose of the data.  In the case of an
@@ -338,7 +372,7 @@ replace_history_entry (which, line, data)
 {
   HIST_ENTRY *temp, *old_value;
 
-  if (which >= history_length)
+  if (which < 0 || which >= history_length)
     return ((HIST_ENTRY *)NULL);
 
   temp = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));
@@ -352,6 +386,51 @@ replace_history_entry (which, line, data)
   return (old_value);
 }
 
+/* Replace the DATA in the specified history entries, replacing OLD with
+   NEW.  WHICH says which one(s) to replace:  WHICH == -1 means to replace
+   all of the history entries where entry->data == OLD; WHICH == -2 means
+   to replace the `newest' history entry where entry->data == OLD; and
+   WHICH >= 0 means to replace that particular history entry's data, as
+   long as it matches OLD. */
+void
+replace_history_data (which,old, new)
+     int which;
+     histdata_t *old, *new;
+{
+  HIST_ENTRY *entry;
+  register int i, last;
+
+  if (which < -2 || which >= history_length || history_length == 0 || the_history == 0)
+    return;
+
+  if (which >= 0)
+    {
+      entry = the_history[which];
+      if (entry && entry->data == old)
+	entry->data = new;
+      return;
+    }
+
+  last = -1;
+  for (i = 0; i < history_length; i++)
+    {
+      entry = the_history[i];
+      if (entry == 0)
+	continue;
+      if (entry->data == old)
+	{
+	  last = i;
+	  if (which == -1)
+	    entry->data = new;
+	}
+    }
+  if (which == -2 && last >= 0)
+    {
+      entry = the_history[last];
+      entry->data = new;	/* XXX - we don't check entry->old */
+    }
+}      
+  
 /* Remove history element WHICH from the history.  The removed
    element is returned to you so you can free the line, data,
    and containing structure. */
@@ -362,17 +441,15 @@ remove_history (which)
   HIST_ENTRY *return_value;
   register int i;
 
-  if (which >= history_length || !history_length)
-    return_value = (HIST_ENTRY *)NULL;
-  else
-    {
-      return_value = the_history[which];
+  if (which < 0 || which >= history_length || history_length ==  0 || the_history == 0)
+    return ((HIST_ENTRY *)NULL);
 
-      for (i = which; i < history_length; i++)
-	the_history[i] = the_history[i + 1];
+  return_value = the_history[which];
 
-      history_length--;
-    }
+  for (i = which; i < history_length; i++)
+    the_history[i] = the_history[i + 1];
+
+  history_length--;
 
   return (return_value);
 }