1/* manexamp.c -- The examples which appear in the documentation are here. */
2
3/* Copyright (C) 1987-2009 Free Software Foundation, Inc.
4
5   This file is part of the GNU Readline Library (Readline), a library for
6   reading lines of text with interactive input and history editing.
7
8   Readline is free software: you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation, either version 3 of the License, or
11   (at your option) any later version.
12
13   Readline is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with Readline.  If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include <stdio.h>
23#include <readline/readline.h>
24
25/* **************************************************************** */
26/*                                                                  */
27/*   			How to Emulate gets ()			    */
28/*                                                                  */
29/* **************************************************************** */
30
31/* A static variable for holding the line. */
32static char *line_read = (char *)NULL;
33
34/* Read a string, and return a pointer to it.  Returns NULL on EOF. */
35char *
36rl_gets ()
37{
38  /* If the buffer has already been allocated, return the memory
39     to the free pool. */
40  if (line_read)
41    {
42      free (line_read);
43      line_read = (char *)NULL;
44    }
45
46  /* Get a line from the user. */
47  line_read = readline ("");
48
49  /* If the line has any text in it, save it on the history. */
50  if (line_read && *line_read)
51    add_history (line_read);
52
53  return (line_read);
54}
55
56/* **************************************************************** */
57/*                                                                  */
58/*        Writing a Function to be Called by Readline.              */
59/*                                                                  */
60/* **************************************************************** */
61
62/* Invert the case of the COUNT following characters. */
63invert_case_line (count, key)
64     int count, key;
65{
66  register int start, end;
67
68  start = rl_point;
69
70  if (count < 0)
71    {
72      direction = -1;
73      count = -count;
74    }
75  else
76    direction = 1;
77
78  /* Find the end of the range to modify. */
79  end = start + (count * direction);
80
81  /* Force it to be within range. */
82  if (end > rl_end)
83    end = rl_end;
84  else if (end < 0)
85    end = -1;
86
87  if (start > end)
88    {
89      int temp = start;
90      start = end;
91      end = temp;
92    }
93
94  if (start == end)
95    return;
96
97  /* Tell readline that we are modifying the line, so save the undo
98     information. */
99  rl_modifying (start, end);
100
101  for (; start != end; start += direction)
102    {
103      if (_rl_uppercase_p (rl_line_buffer[start]))
104	rl_line_buffer[start] = _rl_to_lower (rl_line_buffer[start]);
105      else if (_rl_lowercase_p (rl_line_buffer[start]))
106	rl_line_buffer[start] = _rl_to_upper (rl_line_buffer[start]);
107    }
108
109  /* Move point to on top of the last character changed. */
110  rl_point = end - direction;
111}
112