1 | /* input.c -- character input functions for readline. */ |
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2 | |
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3 | /* Copyright (C) 1994 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 2, 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 <sys/types.h> |
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29 | #include <fcntl.h> |
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30 | #if defined (HAVE_SYS_FILE_H) |
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31 | # include <sys/file.h> |
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32 | #endif /* HAVE_SYS_FILE_H */ |
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33 | |
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34 | #if defined (HAVE_UNISTD_H) |
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35 | # include <unistd.h> |
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36 | #endif /* HAVE_UNISTD_H */ |
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37 | |
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38 | #if defined (HAVE_STDLIB_H) |
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39 | # include <stdlib.h> |
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40 | #else |
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41 | # include "ansi_stdlib.h" |
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42 | #endif /* HAVE_STDLIB_H */ |
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43 | |
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44 | #if defined (HAVE_SELECT) |
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45 | # if !defined (HAVE_SYS_SELECT_H) || !defined (M_UNIX) |
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46 | # include <sys/time.h> |
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47 | # endif |
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48 | #endif /* HAVE_SELECT */ |
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49 | #if defined (HAVE_SYS_SELECT_H) |
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50 | # include <sys/select.h> |
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51 | #endif |
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52 | |
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53 | #if defined (FIONREAD_IN_SYS_IOCTL) |
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54 | # include <sys/ioctl.h> |
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55 | #endif |
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56 | |
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57 | #include <stdio.h> |
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58 | #include <errno.h> |
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59 | |
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60 | #if !defined (errno) |
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61 | extern int errno; |
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62 | #endif /* !errno */ |
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63 | |
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64 | /* System-specific feature definitions and include files. */ |
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65 | #include "rldefs.h" |
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66 | |
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67 | /* Some standard library routines. */ |
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68 | #include "readline.h" |
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69 | |
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70 | /* What kind of non-blocking I/O do we have? */ |
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71 | #if !defined (O_NDELAY) && defined (O_NONBLOCK) |
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72 | # define O_NDELAY O_NONBLOCK /* Posix style */ |
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73 | #endif |
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74 | |
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75 | /* Functions imported from other files in the library. */ |
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76 | extern char *xmalloc (), *xrealloc (); |
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77 | |
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78 | /* Variables and functions from macro.c. */ |
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79 | extern void _rl_add_macro_char (); |
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80 | extern void _rl_with_macro_input (); |
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81 | extern int _rl_next_macro_key (); |
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82 | extern int _rl_defining_kbd_macro; |
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83 | |
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84 | #if defined (VI_MODE) |
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85 | extern void _rl_vi_set_last (); |
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86 | extern int _rl_vi_textmod_command (); |
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87 | #endif /* VI_MODE */ |
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88 | |
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89 | extern FILE *rl_instream, *rl_outstream; |
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90 | extern Function *rl_last_func; |
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91 | extern int rl_key_sequence_length; |
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92 | extern int rl_pending_input; |
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93 | extern int rl_editing_mode; |
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94 | |
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95 | extern Keymap _rl_keymap; |
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96 | |
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97 | extern int _rl_convert_meta_chars_to_ascii; |
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98 | |
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99 | #if defined (__GO32__) |
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100 | # include <pc.h> |
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101 | #endif /* __GO32__ */ |
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102 | |
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103 | /* Non-null means it is a pointer to a function to run while waiting for |
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104 | character input. */ |
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105 | Function *rl_event_hook = (Function *)NULL; |
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106 | |
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107 | Function *rl_getc_function = rl_getc; |
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108 | |
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109 | /* **************************************************************** */ |
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110 | /* */ |
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111 | /* Character Input Buffering */ |
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112 | /* */ |
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113 | /* **************************************************************** */ |
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114 | |
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115 | static int pop_index, push_index; |
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116 | static unsigned char ibuffer[512]; |
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117 | static int ibuffer_len = sizeof (ibuffer) - 1; |
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118 | |
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119 | #define any_typein (push_index != pop_index) |
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120 | |
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121 | int |
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122 | _rl_any_typein () |
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123 | { |
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124 | return any_typein; |
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125 | } |
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126 | |
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127 | /* Return the amount of space available in the buffer for stuffing |
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128 | characters. */ |
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129 | static int |
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130 | ibuffer_space () |
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131 | { |
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132 | if (pop_index > push_index) |
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133 | return (pop_index - push_index - 1); |
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134 | else |
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135 | return (ibuffer_len - (push_index - pop_index)); |
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136 | } |
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137 | |
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138 | /* Get a key from the buffer of characters to be read. |
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139 | Return the key in KEY. |
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140 | Result is KEY if there was a key, or 0 if there wasn't. */ |
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141 | static int |
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142 | rl_get_char (key) |
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143 | int *key; |
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144 | { |
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145 | if (push_index == pop_index) |
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146 | return (0); |
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147 | |
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148 | *key = ibuffer[pop_index++]; |
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149 | |
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150 | if (pop_index >= ibuffer_len) |
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151 | pop_index = 0; |
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152 | |
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153 | return (1); |
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154 | } |
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155 | |
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156 | /* Stuff KEY into the *front* of the input buffer. |
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157 | Returns non-zero if successful, zero if there is |
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158 | no space left in the buffer. */ |
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159 | static int |
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160 | rl_unget_char (key) |
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161 | int key; |
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162 | { |
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163 | if (ibuffer_space ()) |
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164 | { |
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165 | pop_index--; |
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166 | if (pop_index < 0) |
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167 | pop_index = ibuffer_len - 1; |
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168 | ibuffer[pop_index] = key; |
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169 | return (1); |
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170 | } |
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171 | return (0); |
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172 | } |
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173 | |
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174 | /* If a character is available to be read, then read it |
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175 | and stuff it into IBUFFER. Otherwise, just return. */ |
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176 | static void |
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177 | rl_gather_tyi () |
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178 | { |
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179 | #if defined (__GO32__) |
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180 | char input; |
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181 | |
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182 | if (isatty (0) && kbhit () && ibuffer_space ()) |
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183 | { |
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184 | int i; |
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185 | i = (*rl_getc_function) (rl_instream); |
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186 | rl_stuff_char (i); |
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187 | } |
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188 | #else /* !__GO32__ */ |
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189 | |
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190 | int tty; |
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191 | register int tem, result; |
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192 | int chars_avail; |
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193 | char input; |
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194 | #if defined(HAVE_SELECT) |
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195 | fd_set readfds, exceptfds; |
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196 | struct timeval timeout; |
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197 | #endif |
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198 | |
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199 | tty = fileno (rl_instream); |
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200 | |
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201 | #if defined (HAVE_SELECT) |
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202 | FD_ZERO (&readfds); |
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203 | FD_ZERO (&exceptfds); |
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204 | FD_SET (tty, &readfds); |
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205 | FD_SET (tty, &exceptfds); |
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206 | timeout.tv_sec = 0; |
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207 | timeout.tv_usec = 100000; /* 0.1 seconds */ |
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208 | if (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) <= 0) |
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209 | return; /* Nothing to read. */ |
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210 | #endif |
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211 | |
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212 | result = -1; |
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213 | #if defined (FIONREAD) |
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214 | result = ioctl (tty, FIONREAD, &chars_avail); |
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215 | #endif |
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216 | |
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217 | #if defined (O_NDELAY) |
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218 | if (result == -1) |
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219 | { |
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220 | tem = fcntl (tty, F_GETFL, 0); |
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221 | |
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222 | fcntl (tty, F_SETFL, (tem | O_NDELAY)); |
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223 | chars_avail = read (tty, &input, 1); |
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224 | |
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225 | fcntl (tty, F_SETFL, tem); |
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226 | if (chars_avail == -1 && errno == EAGAIN) |
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227 | return; |
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228 | } |
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229 | #endif /* O_NDELAY */ |
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230 | |
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231 | /* If there's nothing available, don't waste time trying to read |
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232 | something. */ |
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233 | if (chars_avail <= 0) |
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234 | return; |
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235 | |
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236 | tem = ibuffer_space (); |
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237 | |
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238 | if (chars_avail > tem) |
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239 | chars_avail = tem; |
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240 | |
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241 | /* One cannot read all of the available input. I can only read a single |
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242 | character at a time, or else programs which require input can be |
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243 | thwarted. If the buffer is larger than one character, I lose. |
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244 | Damn! */ |
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245 | if (tem < ibuffer_len) |
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246 | chars_avail = 0; |
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247 | |
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248 | if (result != -1) |
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249 | { |
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250 | while (chars_avail--) |
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251 | rl_stuff_char ((*rl_getc_function) (rl_instream)); |
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252 | } |
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253 | else |
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254 | { |
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255 | if (chars_avail) |
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256 | rl_stuff_char (input); |
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257 | } |
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258 | #endif /* !__GO32__ */ |
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259 | } |
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260 | |
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261 | /* Is there input available to be read on the readline input file |
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262 | descriptor? Only works if the system has select(2) or FIONREAD. */ |
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263 | int |
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264 | _rl_input_available () |
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265 | { |
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266 | #if defined(HAVE_SELECT) |
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267 | fd_set readfds, exceptfds; |
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268 | struct timeval timeout; |
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269 | #endif |
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270 | #if defined(FIONREAD) |
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271 | int chars_avail; |
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272 | #endif |
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273 | int tty; |
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274 | |
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275 | tty = fileno (rl_instream); |
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276 | |
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277 | #if defined (HAVE_SELECT) |
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278 | FD_ZERO (&readfds); |
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279 | FD_ZERO (&exceptfds); |
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280 | FD_SET (tty, &readfds); |
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281 | FD_SET (tty, &exceptfds); |
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282 | timeout.tv_sec = 0; |
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283 | timeout.tv_usec = 100000; /* 0.1 seconds */ |
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284 | return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0); |
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285 | #endif |
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286 | |
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287 | #if defined (FIONREAD) |
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288 | if (ioctl (tty, FIONREAD, &chars_avail) == 0) |
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289 | return (chars_avail); |
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290 | #endif |
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291 | |
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292 | return 0; |
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293 | } |
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294 | |
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295 | void |
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296 | _rl_insert_typein (c) |
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297 | int c; |
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298 | { |
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299 | int key, t, i; |
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300 | char *string; |
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301 | |
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302 | i = key = 0; |
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303 | string = xmalloc (ibuffer_len + 1); |
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304 | string[i++] = (char) c; |
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305 | |
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306 | while ((t = rl_get_char (&key)) && |
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307 | _rl_keymap[key].type == ISFUNC && |
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308 | _rl_keymap[key].function == rl_insert) |
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309 | string[i++] = key; |
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310 | |
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311 | if (t) |
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312 | rl_unget_char (key); |
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313 | |
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314 | string[i] = '\0'; |
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315 | rl_insert_text (string); |
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316 | free (string); |
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317 | } |
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318 | |
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319 | /* Add KEY to the buffer of characters to be read. Returns 1 if the |
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320 | character was stuffed correctly; 0 otherwise. */ |
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321 | int |
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322 | rl_stuff_char (key) |
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323 | int key; |
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324 | { |
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325 | if (ibuffer_space () == 0) |
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326 | return 0; |
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327 | |
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328 | if (key == EOF) |
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329 | { |
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330 | key = NEWLINE; |
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331 | rl_pending_input = EOF; |
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332 | } |
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333 | ibuffer[push_index++] = key; |
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334 | if (push_index >= ibuffer_len) |
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335 | push_index = 0; |
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336 | |
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337 | return 1; |
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338 | } |
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339 | |
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340 | /* Make C be the next command to be executed. */ |
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341 | int |
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342 | rl_execute_next (c) |
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343 | int c; |
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344 | { |
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345 | rl_pending_input = c; |
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346 | return 0; |
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347 | } |
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348 | |
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349 | /* **************************************************************** */ |
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350 | /* */ |
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351 | /* Character Input */ |
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352 | /* */ |
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353 | /* **************************************************************** */ |
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354 | |
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355 | /* Read a key, including pending input. */ |
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356 | int |
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357 | rl_read_key () |
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358 | { |
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359 | int c; |
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360 | |
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361 | rl_key_sequence_length++; |
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362 | |
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363 | if (rl_pending_input) |
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364 | { |
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365 | c = rl_pending_input; |
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366 | rl_pending_input = 0; |
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367 | } |
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368 | else |
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369 | { |
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370 | /* If input is coming from a macro, then use that. */ |
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371 | if (c = _rl_next_macro_key ()) |
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372 | return (c); |
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373 | |
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374 | /* If the user has an event function, then call it periodically. */ |
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375 | if (rl_event_hook) |
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376 | { |
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377 | while (rl_event_hook && rl_get_char (&c) == 0) |
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378 | { |
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379 | (*rl_event_hook) (); |
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380 | rl_gather_tyi (); |
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381 | } |
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382 | } |
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383 | else |
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384 | { |
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385 | if (rl_get_char (&c) == 0) |
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386 | c = (*rl_getc_function) (rl_instream); |
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387 | } |
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388 | } |
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389 | |
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390 | return (c); |
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391 | } |
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392 | |
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393 | int |
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394 | rl_getc (stream) |
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395 | FILE *stream; |
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396 | { |
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397 | int result, flags; |
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398 | unsigned char c; |
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399 | |
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400 | #if defined (__GO32__) |
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401 | if (isatty (0)) |
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402 | return (getkey () & 0x7F); |
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403 | #endif /* __GO32__ */ |
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404 | |
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405 | while (1) |
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406 | { |
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407 | result = read (fileno (stream), &c, sizeof (unsigned char)); |
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408 | |
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409 | if (result == sizeof (unsigned char)) |
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410 | return (c); |
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411 | |
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412 | /* If zero characters are returned, then the file that we are |
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413 | reading from is empty! Return EOF in that case. */ |
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414 | if (result == 0) |
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415 | return (EOF); |
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416 | |
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417 | #if defined (__BEOS__) |
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418 | if (errno == EINTR) |
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419 | continue; |
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420 | #endif |
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421 | |
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422 | #if defined (EWOULDBLOCK) |
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423 | if (errno == EWOULDBLOCK) |
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424 | { |
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425 | if ((flags = fcntl (fileno (stream), F_GETFL, 0)) < 0) |
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426 | return (EOF); |
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427 | if (flags & O_NDELAY) |
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428 | { |
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429 | flags &= ~O_NDELAY; |
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430 | fcntl (fileno (stream), F_SETFL, flags); |
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431 | continue; |
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432 | } |
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433 | continue; |
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434 | } |
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435 | #endif /* EWOULDBLOCK */ |
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436 | |
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437 | #if defined (_POSIX_VERSION) && defined (EAGAIN) && defined (O_NONBLOCK) |
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438 | if (errno == EAGAIN) |
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439 | { |
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440 | if ((flags = fcntl (fileno (stream), F_GETFL, 0)) < 0) |
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441 | return (EOF); |
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442 | if (flags & O_NONBLOCK) |
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443 | { |
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444 | flags &= ~O_NONBLOCK; |
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445 | fcntl (fileno (stream), F_SETFL, flags); |
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446 | continue; |
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447 | } |
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448 | } |
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449 | #endif /* _POSIX_VERSION && EAGAIN && O_NONBLOCK */ |
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450 | |
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451 | #if !defined (__GO32__) |
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452 | /* If the error that we received was SIGINT, then try again, |
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453 | this is simply an interrupted system call to read (). |
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454 | Otherwise, some error ocurred, also signifying EOF. */ |
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455 | if (errno != EINTR) |
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456 | return (EOF); |
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457 | #endif /* !__GO32__ */ |
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458 | } |
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459 | } |
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