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Chet Ramey
135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/* manexamp.c -- The examples which appear in the documentation are here. */
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/* Copyright (C) 1987-2009,2023 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library (Readline), a library for
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reading lines of text with interactive input and history editing.
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Readline is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Readline is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Readline. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <errno.h>
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#include <locale.h>
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#ifndef errno
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extern int errno;
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#endif
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#if defined (READLINE_LIBRARY)
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# include "readline.h"
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# include "history.h"
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#else
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# include <readline/readline.h>
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# include <readline/history.h>
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#endif
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/* **************************************************************** */
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/* */
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/* How to Emulate gets () */
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/* */
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/* **************************************************************** */
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/* A static variable for holding the line. */
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static char *line_read = (char *)NULL;
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/* Read a string, and return a pointer to it. Returns NULL on EOF. */
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char *
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rl_gets (void)
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{
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/* If the buffer has already been allocated, return the memory
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to the free pool. */
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if (line_read)
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{
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free (line_read);
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line_read = (char *)NULL;
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}
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/* Get a line from the user. */
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line_read = readline ("");
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/* If the line has any text in it, save it on the history. */
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if (line_read && *line_read)
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add_history (line_read);
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return (line_read);
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}
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/* **************************************************************** */
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/* */
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/* Writing a Function to be Called by Readline. */
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/* */
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/* **************************************************************** */
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/* Invert the case of the COUNT following characters. */
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int
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invert_case_line (int count, int key)
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{
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int start, end;
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int direction;
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start = rl_point;
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/* Find the end of the range to modify. */
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end = start + count;
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/* Force it to be within range. */
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if (end > rl_end)
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end = rl_end;
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else if (end < 0)
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end = -1;
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if (start == end)
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return 0;
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/* For positive arguments, put point after the last changed character. For
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negative arguments, put point before the last changed character. */
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rl_point = end;
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/* Swap start and end if we are moving backwards */
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if (start > end)
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{
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int temp = start;
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start = end;
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end = temp;
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}
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/* Tell readline that we are modifying the line, so save the undo
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information. */
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rl_modifying (start, end);
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for (; start != end; start++)
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{
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if (_rl_uppercase_p (rl_line_buffer[start]))
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rl_line_buffer[start] = _rl_to_lower (rl_line_buffer[start]);
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else if (_rl_lowercase_p (rl_line_buffer[start]))
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rl_line_buffer[start] = _rl_to_upper (rl_line_buffer[start]);
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}
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return 0;
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}
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