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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:55 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:55 +0000
commitd60d9f651ab04df95fcd31488fbb46be263382ae (patch)
treee3dca903583e6c52788d623f4d3f5f31e2726dd3 /readline/callback.c
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Initial creation of sourceware repository
Diffstat (limited to 'readline/callback.c')
-rw-r--r--readline/callback.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/readline/callback.c b/readline/callback.c
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+/* 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 1, 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,
+ 675 Mass Ave, Cambridge, MA 02139, 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"
+
+extern void readline_internal_startup ();
+extern char *readline_internal_teardown ();
+extern int readline_internal_char ();
+extern void _rl_init_line_state ();
+
+extern int _rl_meta_flag;
+extern char *rl_prompt;
+extern int rl_visible_prompt_length;
+
+/* **************************************************************** */
+/* */
+/* 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