| 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. */ |
| 32 | static char *line_read = (char *)NULL; |
| 33 | |
| 34 | /* Read a string, and return a pointer to it. Returns NULL on EOF. */ |
| 35 | char * |
| 36 | rl_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. */ |
| 63 | invert_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 | } |