GNU readline-4.1

1 files changed, 141 insertions, 0 deletions

diff --git a/gnu/lib/libreadline/callback.c b/gnu/lib/libreadline/callback.c
new file mode 100644
index 00000000000..117235697e1
--- /dev/null
+++ b/gnu/lib/libreadline/callback.c
@@ -0,0 +1,141 @@
+/* callback.c -- functions to use readline as an X `callback' mechanism. */
+
+/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
+
+   This file is part of the GNU Readline Library, a library for
+   reading lines of text with interactive input and history editing.
+
+   The GNU Readline Library is free software; you can redistribute it
+   and/or modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2, or
+   (at your option) any later version.
+
+   The GNU Readline Library is distributed in the hope that it will be
+   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   The GNU General Public License is often shipped with GNU software, and
+   is generally kept in a file called COPYING or LICENSE.  If you do not
+   have a copy of the license, write to the Free Software Foundation,
+   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+#define READLINE_LIBRARY
+
+#if defined (HAVE_CONFIG_H)
+#  include <config.h>
+#endif
+
+#include "rlconf.h"
+
+#if defined (READLINE_CALLBACKS)
+
+#include <sys/types.h>
+#include <stdio.h>
+
+/* System-specific feature definitions and include files. */
+#include "rldefs.h"
+#include "readline.h"
+#include "rlprivate.h"
+
+/* **************************************************************** */
+/*								    */
+/*			Callback Readline Functions                 */
+/*								    */
+/* **************************************************************** */
+
+/* Allow using readline in situations where a program may have multiple
+   things to handle at once, and dispatches them via select().  Call
+   rl_callback_handler_install() with the prompt and a function to call
+   whenever a complete line of input is ready.  The user must then
+   call rl_callback_read_char() every time some input is available, and 
+   rl_callback_read_char() will call the user's function with the complete
+   text read in at each end of line.  The terminal is kept prepped and
+   signals handled all the time, except during calls to the user's function. */
+
+VFunction *rl_linefunc;		/* user callback function */
+static int in_handler;		/* terminal_prepped and signals set? */
+
+/* Make sure the terminal is set up, initialize readline, and prompt. */
+static void
+_rl_callback_newline ()
+{
+  rl_initialize ();
+
+  if (in_handler == 0)
+    {
+      in_handler = 1;
+
+      (*rl_prep_term_function) (_rl_meta_flag);
+
+#if defined (HANDLE_SIGNALS)
+      rl_set_signals ();
+#endif
+    }
+
+  readline_internal_setup ();
+}
+
+/* Install a readline handler, set up the terminal, and issue the prompt. */
+void
+rl_callback_handler_install (prompt, linefunc)
+     char *prompt;
+     VFunction *linefunc;
+{
+  rl_prompt = prompt;
+  rl_visible_prompt_length = rl_prompt ? rl_expand_prompt (rl_prompt) : 0;
+  rl_linefunc = linefunc;
+  _rl_callback_newline ();
+}
+
+/* Read one character, and dispatch to the handler if it ends the line. */
+void
+rl_callback_read_char ()
+{
+  char *line;
+  int eof;
+
+  if (rl_linefunc == NULL)
+    {
+      fprintf (stderr, "readline: readline_callback_read_char() called with no handler!\r\n");
+      abort ();
+    }
+
+  eof = readline_internal_char ();
+
+  if (rl_done)
+    {
+      line = readline_internal_teardown (eof);
+
+      (*rl_deprep_term_function) ();
+#if defined (HANDLE_SIGNALS)
+      rl_clear_signals ();
+#endif
+      in_handler = 0;
+      (*rl_linefunc) (line);
+
+    /* If the user did not clear out the line, do it for him. */
+    if (rl_line_buffer[0])
+      _rl_init_line_state ();
+
+    /* Redisplay the prompt if readline_handler_{install,remove} not called. */
+      if (in_handler == 0 && rl_linefunc)
+	_rl_callback_newline ();
+    }
+}
+
+/* Remove the handler, and make sure the terminal is in its normal state. */
+void
+rl_callback_handler_remove ()
+{
+  rl_linefunc = NULL;
+  if (in_handler)
+    {
+      in_handler = 0;
+      (*rl_deprep_term_function) ();
+#if defined (HANDLE_SIGNALS)
+      rl_clear_signals ();
+#endif
+    }
+}
+
+#endif