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1 /* callback.c -- functions to use readline as an X `callback' mechanism. */ |
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2 |
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3 /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. |
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4 |
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5 This file is part of the GNU Readline Library, a library for |
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6 reading lines of text with interactive input and history editing. |
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7 |
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8 The GNU Readline Library is free software; you can redistribute it |
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9 and/or modify it under the terms of the GNU General Public License |
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10 as published by the Free Software Foundation; either version 1, or |
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11 (at your option) any later version. |
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12 |
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13 The GNU Readline Library is distributed in the hope that it will be |
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14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
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15 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 GNU General Public License for more details. |
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17 |
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18 The GNU General Public License is often shipped with GNU software, and |
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19 is generally kept in a file called COPYING or LICENSE. If you do not |
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20 have a copy of the license, write to the Free Software Foundation, |
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21 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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22 #define READLINE_LIBRARY |
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23 |
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24 #if defined (HAVE_CONFIG_H) |
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25 # include <config.h> |
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26 #endif |
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27 |
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28 #include "rlconf.h" |
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29 |
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30 #if defined (READLINE_CALLBACKS) |
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31 |
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32 #include <sys/types.h> |
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33 #include <stdio.h> |
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34 |
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35 /* System-specific feature definitions and include files. */ |
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36 #include "rldefs.h" |
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37 #include "readline.h" |
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38 |
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39 extern void readline_internal_startup (); |
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40 extern char *readline_internal_teardown (); |
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41 extern int readline_internal_char (); |
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42 extern void _rl_init_line_state (); |
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43 |
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44 extern int _rl_meta_flag; |
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45 extern char *rl_prompt; |
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46 extern int rl_visible_prompt_length; |
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47 |
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48 /* **************************************************************** */ |
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49 /* */ |
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50 /* Callback Readline Functions */ |
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51 /* */ |
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52 /* **************************************************************** */ |
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53 |
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54 /* Allow using readline in situations where a program may have multiple |
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55 things to handle at once, and dispatches them via select(). Call |
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56 rl_callback_handler_install() with the prompt and a function to call |
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57 whenever a complete line of input is ready. The user must then |
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58 call readline_char() every time some input is available, and |
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59 readline_char() will call the user's function with the complete text |
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60 read in at each end of line. The terminal is kept prepped and signals |
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61 handled all the time, except during calls to the user's function. */ |
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62 |
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63 VFunction *rl_linefunc; /* user callback function */ |
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64 static int in_handler; /* terminal_prepped and signals set? */ |
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65 |
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66 /* Make sure the terminal is set up, initialize readline, and prompt. */ |
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67 static void |
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68 _rl_callback_newline () |
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69 { |
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70 rl_initialize (); |
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71 |
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72 if (in_handler == 0) |
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73 { |
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74 in_handler = 1; |
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75 |
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76 (*rl_prep_term_function) (_rl_meta_flag); |
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77 |
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78 #if defined (HANDLE_SIGNALS) |
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79 rl_set_signals (); |
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80 #endif |
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81 } |
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82 |
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83 readline_internal_setup (); |
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84 } |
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85 |
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86 /* Install a readline handler, set up the terminal, and issue the prompt. */ |
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87 void |
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88 rl_callback_handler_install (prompt, linefunc) |
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89 char *prompt; |
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90 VFunction *linefunc; |
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91 { |
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92 rl_prompt = prompt; |
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93 rl_visible_prompt_length = rl_prompt ? rl_expand_prompt (rl_prompt) : 0; |
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94 rl_linefunc = linefunc; |
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95 _rl_callback_newline (); |
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96 } |
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97 |
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98 /* Read one character, and dispatch to the handler if it ends the line. */ |
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99 void |
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100 rl_callback_read_char () |
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101 { |
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102 char *line; |
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103 int eof; |
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104 |
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105 if (rl_linefunc == NULL) |
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106 { |
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107 fprintf (stderr, "readline: readline_callback_read_char() called with no handler!\r\n"); |
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108 abort (); |
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109 } |
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110 |
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111 eof = readline_internal_char (); |
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112 |
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113 if (rl_done) |
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114 { |
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115 line = readline_internal_teardown (eof); |
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116 |
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117 (*rl_deprep_term_function) (); |
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118 #if defined (HANDLE_SIGNALS) |
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119 rl_clear_signals (); |
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120 #endif |
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121 in_handler = 0; |
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122 (*rl_linefunc) (line); |
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123 |
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124 /* If the user did not clear out the line, do it for him. */ |
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125 if (rl_line_buffer[0]) |
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126 _rl_init_line_state (); |
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127 |
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128 /* Redisplay the prompt if readline_handler_{install,remove} not called. */ |
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129 if (in_handler == 0 && rl_linefunc) |
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130 _rl_callback_newline (); |
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131 } |
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132 } |
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133 |
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134 /* Remove the handler, and make sure the terminal is in its normal state. */ |
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135 void |
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136 rl_callback_handler_remove () |
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137 { |
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138 rl_linefunc = NULL; |
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139 if (in_handler) |
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140 { |
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141 in_handler = 0; |
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142 (*rl_deprep_term_function) (); |
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143 #if defined (HANDLE_SIGNALS) |
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144 rl_clear_signals (); |
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145 #endif |
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146 } |
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147 } |
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148 |
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149 #endif |
