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+/* manexamp.c -- The examples which appear in the documentation are here. */
+
+/* Copyright (C) 1987-2002 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. */
+
+#include <stdio.h>
+#include <readline/readline.h>
+
+/* **************************************************************** */
+/* */
+/* How to Emulate gets () */
+/* */
+/* **************************************************************** */
+
+/* A static variable for holding the line. */
+static char *line_read = (char *)NULL;
+
+/* Read a string, and return a pointer to it. Returns NULL on EOF. */
+char *
+rl_gets ()
+{
+ /* If the buffer has already been allocated, return the memory
+ to the free pool. */
+ if (line_read)
+ {
+ free (line_read);
+ line_read = (char *)NULL;
+ }
+
+ /* Get a line from the user. */
+ line_read = readline ("");
+
+ /* If the line has any text in it, save it on the history. */
+ if (line_read && *line_read)
+ add_history (line_read);
+
+ return (line_read);
+}
+
+/* **************************************************************** */
+/* */
+/* Writing a Function to be Called by Readline. */
+/* */
+/* **************************************************************** */
+
+/* Invert the case of the COUNT following characters. */
+invert_case_line (count, key)
+ int count, key;
+{
+ register int start, end;
+
+ start = rl_point;
+
+ if (count < 0)
+ {
+ direction = -1;
+ count = -count;
+ }
+ else
+ direction = 1;
+
+ /* Find the end of the range to modify. */
+ end = start + (count * direction);
+
+ /* Force it to be within range. */
+ if (end > rl_end)
+ end = rl_end;
+ else if (end < 0)
+ end = -1;
+
+ if (start > end)
+ {
+ int temp = start;
+ start = end;
+ end = temp;
+ }
+
+ if (start == end)
+ return;
+
+ /* Tell readline that we are modifying the line, so save the undo
+ information. */
+ rl_modifying (start, end);
+
+ for (; start != end; start += direction)
+ {
+ if (_rl_uppercase_p (rl_line_buffer[start]))
+ rl_line_buffer[start] = _rl_to_lower (rl_line_buffer[start]);
+ else if (_rl_lowercase_p (rl_line_buffer[start]))
+ rl_line_buffer[start] = _rl_to_upper (rl_line_buffer[start]);
+ }
+
+ /* Move point to on top of the last character changed. */
+ rl_point = end - direction;
+}