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+/* manexamp.c -- The examples which appear in the documentation are here. */
+
+/* Copyright (C) 1987-2009 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library (Readline), a library for
+ reading lines of text with interactive input and history editing.
+
+ Readline 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 3 of the License, or
+ (at your option) any later version.
+
+ Readline 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.
+
+ You should have received a copy of the GNU General Public License
+ along with Readline. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#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;
+}