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2996
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1 /* display.c -- readline redisplay facility. */ |
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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 <sys/types.h> |
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29 |
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30 #if defined (HAVE_UNISTD_H) |
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31 # include <unistd.h> |
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32 #endif /* HAVE_UNISTD_H */ |
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33 |
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34 #include "posixstat.h" |
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35 |
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36 #if defined (HAVE_STDLIB_H) |
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37 # include <stdlib.h> |
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38 #else |
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39 # include "ansi_stdlib.h" |
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40 #endif /* HAVE_STDLIB_H */ |
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41 |
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42 #include <stdio.h> |
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43 |
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44 #if defined (__GO32__) |
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45 # include <go32.h> |
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46 # include <pc.h> |
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47 #endif /* __GO32__ */ |
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48 |
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49 /* System-specific feature definitions and include files. */ |
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50 #include "rldefs.h" |
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51 |
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52 /* Termcap library stuff. */ |
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53 #include "tcap.h" |
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54 |
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55 /* Some standard library routines. */ |
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56 #include "readline.h" |
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57 #include "history.h" |
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58 |
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59 #if !defined (strchr) && !defined (__STDC__) |
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60 extern char *strchr (), *strrchr (); |
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61 #endif /* !strchr && !__STDC__ */ |
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62 |
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63 /* Global and pseudo-global variables and functions |
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64 imported from readline.c. */ |
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65 extern char *rl_prompt; |
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66 extern int readline_echoing_p; |
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67 |
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68 extern int _rl_output_meta_chars; |
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69 extern int _rl_horizontal_scroll_mode; |
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70 extern int _rl_mark_modified_lines; |
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71 extern int _rl_prefer_visible_bell; |
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72 |
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73 /* Variables and functions imported from terminal.c */ |
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74 extern void _rl_output_some_chars (); |
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75 extern int _rl_output_character_function (); |
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76 extern int _rl_backspace (); |
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77 |
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78 extern char *term_clreol, *term_clrpag; |
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79 extern char *term_im, *term_ic, *term_ei, *term_DC; |
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80 extern char *term_up, *term_dc, *term_cr, *term_IC; |
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81 extern int screenheight, screenwidth, screenchars; |
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82 extern int terminal_can_insert, _rl_term_autowrap; |
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83 |
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84 /* Pseudo-global functions (local to the readline library) exported |
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85 by this file. */ |
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86 void _rl_move_cursor_relative (), _rl_output_some_chars (); |
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87 void _rl_move_vert (); |
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88 void _rl_clear_to_eol (), _rl_clear_screen (); |
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89 |
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90 static void update_line (), space_to_eol (); |
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91 static void delete_chars (), insert_some_chars (); |
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92 static void cr (); |
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93 |
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94 static int *inv_lbreaks, *vis_lbreaks; |
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95 |
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96 extern char *xmalloc (), *xrealloc (); |
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97 |
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98 /* Heuristic used to decide whether it is faster to move from CUR to NEW |
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99 by backing up or outputting a carriage return and moving forward. */ |
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100 #define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new))) |
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101 |
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102 /* **************************************************************** */ |
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103 /* */ |
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104 /* Display stuff */ |
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105 /* */ |
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106 /* **************************************************************** */ |
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107 |
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108 /* This is the stuff that is hard for me. I never seem to write good |
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109 display routines in C. Let's see how I do this time. */ |
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110 |
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111 /* (PWP) Well... Good for a simple line updater, but totally ignores |
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112 the problems of input lines longer than the screen width. |
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113 |
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114 update_line and the code that calls it makes a multiple line, |
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115 automatically wrapping line update. Careful attention needs |
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116 to be paid to the vertical position variables. */ |
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117 |
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118 /* Keep two buffers; one which reflects the current contents of the |
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119 screen, and the other to draw what we think the new contents should |
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120 be. Then compare the buffers, and make whatever changes to the |
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121 screen itself that we should. Finally, make the buffer that we |
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122 just drew into be the one which reflects the current contents of the |
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123 screen, and place the cursor where it belongs. |
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124 |
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125 Commands that want to can fix the display themselves, and then let |
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126 this function know that the display has been fixed by setting the |
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127 RL_DISPLAY_FIXED variable. This is good for efficiency. */ |
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128 |
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129 /* Application-specific redisplay function. */ |
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130 VFunction *rl_redisplay_function = rl_redisplay; |
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131 |
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132 /* Global variables declared here. */ |
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133 /* What YOU turn on when you have handled all redisplay yourself. */ |
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134 int rl_display_fixed = 0; |
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135 |
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136 int _rl_suppress_redisplay = 0; |
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137 |
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138 /* The stuff that gets printed out before the actual text of the line. |
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139 This is usually pointing to rl_prompt. */ |
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140 char *rl_display_prompt = (char *)NULL; |
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141 |
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142 /* Pseudo-global variables declared here. */ |
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143 /* The visible cursor position. If you print some text, adjust this. */ |
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144 int _rl_last_c_pos = 0; |
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145 int _rl_last_v_pos = 0; |
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146 |
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147 /* Number of lines currently on screen minus 1. */ |
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148 int _rl_vis_botlin = 0; |
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149 |
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150 /* Variables used only in this file. */ |
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151 /* The last left edge of text that was displayed. This is used when |
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152 doing horizontal scrolling. It shifts in thirds of a screenwidth. */ |
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153 static int last_lmargin; |
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154 |
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155 /* The line display buffers. One is the line currently displayed on |
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156 the screen. The other is the line about to be displayed. */ |
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157 static char *visible_line = (char *)NULL; |
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158 static char *invisible_line = (char *)NULL; |
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159 |
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160 /* A buffer for `modeline' messages. */ |
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161 static char msg_buf[128]; |
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162 |
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163 /* Non-zero forces the redisplay even if we thought it was unnecessary. */ |
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164 static int forced_display; |
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165 |
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166 /* Default and initial buffer size. Can grow. */ |
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167 static int line_size = 1024; |
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168 |
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169 static char *local_prompt, *local_prompt_prefix; |
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170 static int visible_length, prefix_length; |
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171 |
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172 /* The number of invisible characters in the line currently being |
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173 displayed on the screen. */ |
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174 static int visible_wrap_offset; |
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175 |
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176 /* static so it can be shared between rl_redisplay and update_line */ |
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177 static int wrap_offset; |
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178 |
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179 /* The index of the last invisible_character in the prompt string. */ |
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180 static int last_invisible; |
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181 |
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182 /* The length (buffer offset) of the first line of the last (possibly |
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183 multi-line) buffer displayed on the screen. */ |
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184 static int visible_first_line_len; |
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185 |
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186 /* Expand the prompt string S and return the number of visible |
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187 characters in *LP, if LP is not null. This is currently more-or-less |
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188 a placeholder for expansion. LIP, if non-null is a place to store the |
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189 index of the last invisible character in ther eturned string. */ |
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190 |
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191 /* Current implementation: |
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192 \001 (^A) start non-visible characters |
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193 \002 (^B) end non-visible characters |
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194 all characters except \001 and \002 (following a \001) are copied to |
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195 the returned string; all characters except those between \001 and |
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196 \002 are assumed to be `visible'. */ |
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197 |
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198 static char * |
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199 expand_prompt (pmt, lp, lip) |
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200 char *pmt; |
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201 int *lp, *lip; |
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202 { |
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203 char *r, *ret, *p; |
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204 int l, rl, last, ignoring; |
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205 |
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206 /* Short-circuit if we can. */ |
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207 if (strchr (pmt, RL_PROMPT_START_IGNORE) == 0) |
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208 { |
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209 r = savestring (pmt); |
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210 if (lp) |
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211 *lp = strlen (r); |
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212 return r; |
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213 } |
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214 |
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215 l = strlen (pmt); |
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216 r = ret = xmalloc (l + 1); |
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217 |
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218 for (rl = ignoring = last = 0, p = pmt; p && *p; p++) |
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219 { |
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220 /* This code strips the invisible character string markers |
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221 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */ |
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222 if (*p == RL_PROMPT_START_IGNORE) |
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223 { |
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224 ignoring++; |
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225 continue; |
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226 } |
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227 else if (ignoring && *p == RL_PROMPT_END_IGNORE) |
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228 { |
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229 ignoring = 0; |
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230 last = r - ret - 1; |
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231 continue; |
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232 } |
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233 else |
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234 { |
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235 *r++ = *p; |
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236 if (!ignoring) |
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237 rl++; |
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238 } |
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239 } |
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240 |
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241 *r = '\0'; |
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242 if (lp) |
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243 *lp = rl; |
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244 if (lip) |
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245 *lip = last; |
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246 return ret; |
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247 } |
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248 |
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249 /* |
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250 * Expand the prompt string into the various display components, if |
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251 * necessary. |
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252 * |
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253 * local_prompt = expanded last line of string in rl_display_prompt |
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254 * (portion after the final newline) |
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255 * local_prompt_prefix = portion before last newline of rl_display_prompt, |
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256 * expanded via expand_prompt |
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257 * visible_length = number of visible characters in local_prompt |
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258 * prefix_length = number of visible characters in local_prompt_prefix |
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259 * |
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260 * This function is called once per call to readline(). It may also be |
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261 * called arbitrarily to expand the primary prompt. |
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262 * |
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263 * The return value is the number of visible characters on the last line |
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264 * of the (possibly multi-line) prompt. |
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265 */ |
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266 int |
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267 rl_expand_prompt (prompt) |
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268 char *prompt; |
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269 { |
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270 char *p, *t; |
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271 int c; |
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272 |
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273 /* Clear out any saved values. */ |
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274 if (local_prompt) |
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275 free (local_prompt); |
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276 if (local_prompt_prefix) |
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277 free (local_prompt_prefix); |
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278 local_prompt = local_prompt_prefix = (char *)0; |
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279 last_invisible = 0; |
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280 |
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281 if (prompt == 0 || *prompt == 0) |
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282 return (0); |
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283 |
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284 p = strrchr (prompt, '\n'); |
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285 if (!p) |
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286 { |
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287 /* The prompt is only one line. */ |
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288 local_prompt = expand_prompt (prompt, &visible_length, &last_invisible); |
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289 local_prompt_prefix = (char *)0; |
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290 return (visible_length); |
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291 } |
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292 else |
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293 { |
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294 /* The prompt spans multiple lines. */ |
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295 t = ++p; |
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296 local_prompt = expand_prompt (p, &visible_length, &last_invisible); |
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297 c = *t; *t = '\0'; |
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298 /* The portion of the prompt string up to and including the |
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299 final newline is now null-terminated. */ |
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300 local_prompt_prefix = expand_prompt (prompt, &prefix_length, (int *)NULL); |
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301 *t = c; |
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302 return (prefix_length); |
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303 } |
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304 } |
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305 |
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306 /* Basic redisplay algorithm. */ |
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307 void |
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308 rl_redisplay () |
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309 { |
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310 register int in, out, c, linenum, cursor_linenum; |
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311 register char *line; |
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312 int c_pos, inv_botlin, lb_botlin, lb_linenum; |
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313 int newlines, lpos, temp; |
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314 char *prompt_this_line; |
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315 |
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316 if (!readline_echoing_p) |
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317 return; |
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318 |
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319 if (!rl_display_prompt) |
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320 rl_display_prompt = ""; |
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321 |
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322 if (invisible_line == 0) |
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323 { |
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324 visible_line = xmalloc (line_size); |
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325 invisible_line = xmalloc (line_size); |
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326 for (in = 0; in < line_size; in++) |
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327 { |
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328 visible_line[in] = 0; |
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329 invisible_line[in] = 1; |
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330 } |
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331 |
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332 /* should be enough, but then again, this is just for testing. */ |
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333 inv_lbreaks = (int *)malloc (256 * sizeof (int)); |
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334 vis_lbreaks = (int *)malloc (256 * sizeof (int)); |
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335 inv_lbreaks[0] = vis_lbreaks[0] = 0; |
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336 |
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337 rl_on_new_line (); |
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338 } |
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339 |
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340 /* Draw the line into the buffer. */ |
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341 c_pos = -1; |
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342 |
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343 line = invisible_line; |
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344 out = inv_botlin = 0; |
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345 |
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346 /* Mark the line as modified or not. We only do this for history |
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347 lines. */ |
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348 if (_rl_mark_modified_lines && current_history () && rl_undo_list) |
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349 { |
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350 line[out++] = '*'; |
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351 line[out] = '\0'; |
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352 } |
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353 |
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354 /* If someone thought that the redisplay was handled, but the currently |
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355 visible line has a different modification state than the one about |
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356 to become visible, then correct the caller's misconception. */ |
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357 if (visible_line[0] != invisible_line[0]) |
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358 rl_display_fixed = 0; |
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359 |
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360 /* If the prompt to be displayed is the `primary' readline prompt (the |
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361 one passed to readline()), use the values we have already expanded. |
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362 If not, use what's already in rl_display_prompt. WRAP_OFFSET is the |
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363 number of non-visible characters in the prompt string. */ |
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364 if (rl_display_prompt == rl_prompt || local_prompt) |
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365 { |
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366 int local_len = local_prompt ? strlen (local_prompt) : 0; |
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367 if (local_prompt_prefix && forced_display) |
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368 _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix)); |
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369 |
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370 if (local_len > 0) |
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371 { |
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372 strncpy (line + out, local_prompt, local_len); |
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373 out += local_len; |
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374 } |
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375 line[out] = '\0'; |
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376 wrap_offset = local_len - visible_length; |
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377 } |
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378 else |
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379 { |
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380 int pmtlen; |
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381 prompt_this_line = strrchr (rl_display_prompt, '\n'); |
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382 if (!prompt_this_line) |
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383 prompt_this_line = rl_display_prompt; |
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384 else |
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385 { |
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386 prompt_this_line++; |
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387 if (forced_display) |
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388 { |
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389 _rl_output_some_chars (rl_display_prompt, prompt_this_line - rl_display_prompt); |
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390 /* Make sure we are at column zero even after a newline, |
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391 regardless of the state of terminal output processing. */ |
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392 if (prompt_this_line[-2] != '\r') |
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393 cr (); |
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394 } |
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395 } |
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396 |
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397 pmtlen = strlen (prompt_this_line); |
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398 strncpy (line + out, prompt_this_line, pmtlen); |
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399 out += pmtlen; |
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400 line[out] = '\0'; |
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401 wrap_offset = 0; |
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402 } |
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403 |
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404 #define CHECK_LPOS() \ |
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405 do { \ |
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406 lpos++; \ |
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407 if (lpos >= screenwidth) \ |
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408 { \ |
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409 inv_lbreaks[++newlines] = out; \ |
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410 lpos = 0; \ |
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411 } \ |
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412 } while (0) |
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413 |
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414 /* inv_lbreaks[i] is where line i starts in the buffer. */ |
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415 inv_lbreaks[newlines = 0] = 0; |
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416 lpos = out - wrap_offset; |
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417 |
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418 /* XXX - what if lpos is already >= screenwidth before we start drawing the |
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419 contents of the command line? */ |
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420 while (lpos >= screenwidth) |
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421 { |
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422 temp = ((newlines + 1) * screenwidth) - ((newlines == 0) ? wrap_offset : 0); |
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423 inv_lbreaks[++newlines] = temp; |
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424 lpos -= screenwidth; |
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425 } |
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426 |
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427 lb_linenum = 0; |
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428 for (in = 0; in < rl_end; in++) |
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429 { |
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430 c = (unsigned char)rl_line_buffer[in]; |
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431 |
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432 if (out + 8 >= line_size) /* XXX - 8 for \t */ |
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433 { |
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434 line_size *= 2; |
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435 visible_line = xrealloc (visible_line, line_size); |
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436 invisible_line = xrealloc (invisible_line, line_size); |
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437 line = invisible_line; |
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438 } |
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439 |
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440 if (in == rl_point) |
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441 { |
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442 c_pos = out; |
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443 lb_linenum = newlines; |
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444 } |
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445 |
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446 if (META_CHAR (c)) |
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447 { |
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448 if (_rl_output_meta_chars == 0) |
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449 { |
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450 sprintf (line + out, "\\%o", c); |
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451 |
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452 if (lpos + 4 >= screenwidth) |
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453 { |
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454 temp = screenwidth - lpos; |
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455 inv_lbreaks[++newlines] = out + temp; |
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456 lpos = 4 - temp; |
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457 } |
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458 else |
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459 lpos += 4; |
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460 |
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461 out += 4; |
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462 } |
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463 else |
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464 { |
|
|
465 line[out++] = c; |
|
|
466 CHECK_LPOS(); |
|
|
467 } |
|
|
468 } |
|
|
469 #if defined (DISPLAY_TABS) |
|
|
470 else if (c == '\t') |
|
|
471 { |
|
|
472 register int temp, newout; |
|
|
473 newout = (out | (int)7) + 1; |
|
|
474 temp = newout - out; |
|
|
475 if (lpos + temp >= screenwidth) |
|
|
476 { |
|
|
477 register int temp2; |
|
|
478 temp2 = screenwidth - lpos; |
|
|
479 inv_lbreaks[++newlines] = out + temp2; |
|
|
480 lpos = temp - temp2; |
|
|
481 while (out < newout) |
|
|
482 line[out++] = ' '; |
|
|
483 } |
|
|
484 else |
|
|
485 { |
|
|
486 while (out < newout) |
|
|
487 line[out++] = ' '; |
|
|
488 lpos += temp; |
|
|
489 } |
|
|
490 } |
|
|
491 #endif |
|
|
492 else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && term_up && *term_up) |
|
|
493 { |
|
|
494 line[out++] = '\0'; /* XXX - sentinel */ |
|
|
495 inv_lbreaks[++newlines] = out; |
|
|
496 lpos = 0; |
|
|
497 } |
|
|
498 else if (CTRL_CHAR (c) || c == RUBOUT) |
|
|
499 { |
|
|
500 line[out++] = '^'; |
|
|
501 CHECK_LPOS(); |
|
|
502 line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?'; |
|
|
503 CHECK_LPOS(); |
|
|
504 } |
|
|
505 else |
|
|
506 { |
|
|
507 line[out++] = c; |
|
|
508 CHECK_LPOS(); |
|
|
509 } |
|
|
510 } |
|
|
511 line[out] = '\0'; |
|
|
512 if (c_pos < 0) |
|
|
513 { |
|
|
514 c_pos = out; |
|
|
515 lb_linenum = newlines; |
|
|
516 } |
|
|
517 |
|
|
518 inv_botlin = lb_botlin = newlines; |
|
|
519 inv_lbreaks[newlines+1] = out; |
|
|
520 cursor_linenum = lb_linenum; |
|
|
521 |
|
|
522 /* C_POS == position in buffer where cursor should be placed. */ |
|
|
523 |
|
|
524 /* PWP: now is when things get a bit hairy. The visible and invisible |
|
|
525 line buffers are really multiple lines, which would wrap every |
|
|
526 (screenwidth - 1) characters. Go through each in turn, finding |
|
|
527 the changed region and updating it. The line order is top to bottom. */ |
|
|
528 |
|
|
529 /* If we can move the cursor up and down, then use multiple lines, |
|
|
530 otherwise, let long lines display in a single terminal line, and |
|
|
531 horizontally scroll it. */ |
|
|
532 |
|
|
533 if (_rl_horizontal_scroll_mode == 0 && term_up && *term_up) |
|
|
534 { |
|
|
535 int nleft, pos, changed_screen_line; |
|
|
536 |
|
|
537 if (!rl_display_fixed || forced_display) |
|
|
538 { |
|
|
539 forced_display = 0; |
|
|
540 |
|
|
541 /* If we have more than a screenful of material to display, then |
|
|
542 only display a screenful. We should display the last screen, |
|
|
543 not the first. */ |
|
|
544 if (out >= screenchars) |
|
|
545 out = screenchars - 1; |
|
|
546 |
|
|
547 /* The first line is at character position 0 in the buffer. The |
|
|
548 second and subsequent lines start at inv_lbreaks[N], offset by |
|
|
549 OFFSET (which has already been calculated above). */ |
|
|
550 |
|
|
551 #define W_OFFSET(line, offset) ((line) == 0 ? offset : 0) |
|
|
552 #define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l])) |
|
|
553 #define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l]) |
|
|
554 #define VIS_CHARS(line) (visible_line + vis_lbreaks[line]) |
|
|
555 #define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line) |
|
|
556 #define INV_LINE(line) (invisible_line + inv_lbreaks[line]) |
|
|
557 |
|
|
558 /* For each line in the buffer, do the updating display. */ |
|
|
559 for (linenum = 0; linenum <= inv_botlin; linenum++) |
|
|
560 { |
|
|
561 update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum, |
|
|
562 VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin); |
|
|
563 |
|
|
564 /* If this is the line with the prompt, we might need to |
|
|
565 compensate for invisible characters in the new line. Do |
|
|
566 this only if there is not more than one new line (which |
|
|
567 implies that we completely overwrite the old visible line) |
|
|
568 and the new line is shorter than the old. Make sure we are |
|
|
569 at the end of the new line before clearing. */ |
|
|
570 if (linenum == 0 && |
|
|
571 inv_botlin == 0 && _rl_last_c_pos == out && |
|
|
572 (wrap_offset > visible_wrap_offset) && |
|
|
573 (_rl_last_c_pos < visible_first_line_len)) |
|
|
574 { |
|
|
575 nleft = screenwidth + wrap_offset - _rl_last_c_pos; |
|
|
576 if (nleft) |
|
|
577 _rl_clear_to_eol (nleft); |
|
|
578 } |
|
|
579 |
|
|
580 /* Since the new first line is now visible, save its length. */ |
|
|
581 if (linenum == 0) |
|
|
582 visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset; |
|
|
583 } |
|
|
584 |
|
|
585 /* We may have deleted some lines. If so, clear the left over |
|
|
586 blank ones at the bottom out. */ |
|
|
587 if (_rl_vis_botlin > inv_botlin) |
|
|
588 { |
|
|
589 char *tt; |
|
|
590 for (; linenum <= _rl_vis_botlin; linenum++) |
|
|
591 { |
|
|
592 tt = VIS_CHARS (linenum); |
|
|
593 _rl_move_vert (linenum); |
|
|
594 _rl_move_cursor_relative (0, tt); |
|
|
595 _rl_clear_to_eol |
|
|
596 ((linenum == _rl_vis_botlin) ? strlen (tt) : screenwidth); |
|
|
597 } |
|
|
598 } |
|
|
599 _rl_vis_botlin = inv_botlin; |
|
|
600 |
|
|
601 /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a |
|
|
602 different screen line during this redisplay. */ |
|
|
603 changed_screen_line = _rl_last_v_pos != cursor_linenum; |
|
|
604 if (changed_screen_line) |
|
|
605 { |
|
|
606 _rl_move_vert (cursor_linenum); |
|
|
607 /* If we moved up to the line with the prompt using term_up, |
|
|
608 the physical cursor position on the screen stays the same, |
|
|
609 but the buffer position needs to be adjusted to account |
|
|
610 for invisible characters. */ |
|
|
611 if (cursor_linenum == 0 && wrap_offset) |
|
|
612 _rl_last_c_pos += wrap_offset; |
|
|
613 } |
|
|
614 |
|
|
615 /* We have to reprint the prompt if it contains invisible |
|
|
616 characters, since it's not generally OK to just reprint |
|
|
617 the characters from the current cursor position. But we |
|
|
618 only need to reprint it if the cursor is before the last |
|
|
619 invisible character in the prompt string. */ |
|
|
620 nleft = visible_length + wrap_offset; |
|
|
621 if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 && |
|
|
622 _rl_last_c_pos <= last_invisible && local_prompt) |
|
|
623 { |
|
|
624 if (term_cr) |
|
|
625 tputs (term_cr, 1, _rl_output_character_function); |
|
|
626 _rl_output_some_chars (local_prompt, nleft); |
|
|
627 _rl_last_c_pos = nleft; |
|
|
628 } |
|
|
629 |
|
|
630 /* Where on that line? And where does that line start |
|
|
631 in the buffer? */ |
|
|
632 pos = inv_lbreaks[cursor_linenum]; |
|
|
633 /* nleft == number of characters in the line buffer between the |
|
|
634 start of the line and the cursor position. */ |
|
|
635 nleft = c_pos - pos; |
|
|
636 |
|
|
637 /* Since _rl_backspace() doesn't know about invisible characters in the |
|
|
638 prompt, and there's no good way to tell it, we compensate for |
|
|
639 those characters here and call _rl_backspace() directly. */ |
|
|
640 if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos) |
|
|
641 { |
|
|
642 _rl_backspace (_rl_last_c_pos - nleft); |
|
|
643 _rl_last_c_pos = nleft; |
|
|
644 } |
|
|
645 |
|
|
646 if (nleft != _rl_last_c_pos) |
|
|
647 _rl_move_cursor_relative (nleft, &invisible_line[pos]); |
|
|
648 } |
|
|
649 } |
|
|
650 else /* Do horizontal scrolling. */ |
|
|
651 { |
|
|
652 #define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0) |
|
|
653 int lmargin, ndisp, nleft, phys_c_pos, t; |
|
|
654 |
|
|
655 /* Always at top line. */ |
|
|
656 _rl_last_v_pos = 0; |
|
|
657 |
|
|
658 /* Compute where in the buffer the displayed line should start. This |
|
|
659 will be LMARGIN. */ |
|
|
660 |
|
|
661 /* The number of characters that will be displayed before the cursor. */ |
|
|
662 ndisp = c_pos - wrap_offset; |
|
|
663 nleft = visible_length + wrap_offset; |
|
|
664 /* Where the new cursor position will be on the screen. This can be |
|
|
665 longer than SCREENWIDTH; if it is, lmargin will be adjusted. */ |
|
|
666 phys_c_pos = c_pos - (last_lmargin ? last_lmargin : wrap_offset); |
|
|
667 t = screenwidth / 3; |
|
|
668 |
|
|
669 /* If the number of characters had already exceeded the screenwidth, |
|
|
670 last_lmargin will be > 0. */ |
|
|
671 |
|
|
672 /* If the number of characters to be displayed is more than the screen |
|
|
673 width, compute the starting offset so that the cursor is about |
|
|
674 two-thirds of the way across the screen. */ |
|
|
675 if (phys_c_pos > screenwidth - 2) |
|
|
676 { |
|
|
677 lmargin = c_pos - (2 * t); |
|
|
678 if (lmargin < 0) |
|
|
679 lmargin = 0; |
|
|
680 /* If the left margin would be in the middle of a prompt with |
|
|
681 invisible characters, don't display the prompt at all. */ |
|
|
682 if (wrap_offset && lmargin > 0 && lmargin < nleft) |
|
|
683 lmargin = nleft; |
|
|
684 } |
|
|
685 else if (ndisp < screenwidth - 2) /* XXX - was -1 */ |
|
|
686 lmargin = 0; |
|
|
687 else if (phys_c_pos < 1) |
|
|
688 { |
|
|
689 /* If we are moving back towards the beginning of the line and |
|
|
690 the last margin is no longer correct, compute a new one. */ |
|
|
691 lmargin = ((c_pos - 1) / t) * t; /* XXX */ |
|
|
692 if (wrap_offset && lmargin > 0 && lmargin < nleft) |
|
|
693 lmargin = nleft; |
|
|
694 } |
|
|
695 else |
|
|
696 lmargin = last_lmargin; |
|
|
697 |
|
|
698 /* If the first character on the screen isn't the first character |
|
|
699 in the display line, indicate this with a special character. */ |
|
|
700 if (lmargin > 0) |
|
|
701 line[lmargin] = '<'; |
|
|
702 |
|
|
703 /* If SCREENWIDTH characters starting at LMARGIN do not encompass |
|
|
704 the whole line, indicate that with a special characters at the |
|
|
705 right edge of the screen. If LMARGIN is 0, we need to take the |
|
|
706 wrap offset into account. */ |
|
|
707 t = lmargin + M_OFFSET (lmargin, wrap_offset) + screenwidth; |
|
|
708 if (t < out) |
|
|
709 line[t - 1] = '>'; |
|
|
710 |
|
|
711 if (!rl_display_fixed || forced_display || lmargin != last_lmargin) |
|
|
712 { |
|
|
713 forced_display = 0; |
|
|
714 update_line (&visible_line[last_lmargin], |
|
|
715 &invisible_line[lmargin], |
|
|
716 0, |
|
|
717 screenwidth + visible_wrap_offset, |
|
|
718 screenwidth + (lmargin ? 0 : wrap_offset), |
|
|
719 0); |
|
|
720 |
|
|
721 /* If the visible new line is shorter than the old, but the number |
|
|
722 of invisible characters is greater, and we are at the end of |
|
|
723 the new line, we need to clear to eol. */ |
|
|
724 t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset); |
|
|
725 if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) && |
|
|
726 (_rl_last_c_pos == out) && |
|
|
727 t < visible_first_line_len) |
|
|
728 { |
|
|
729 nleft = screenwidth - t; |
|
|
730 _rl_clear_to_eol (nleft); |
|
|
731 } |
|
|
732 visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset); |
|
|
733 if (visible_first_line_len > screenwidth) |
|
|
734 visible_first_line_len = screenwidth; |
|
|
735 |
|
|
736 _rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]); |
|
|
737 last_lmargin = lmargin; |
|
|
738 } |
|
|
739 } |
|
|
740 fflush (rl_outstream); |
|
|
741 |
|
|
742 /* Swap visible and non-visible lines. */ |
|
|
743 { |
|
|
744 char *temp = visible_line; |
|
|
745 int *itemp = vis_lbreaks; |
|
|
746 visible_line = invisible_line; |
|
|
747 invisible_line = temp; |
|
|
748 vis_lbreaks = inv_lbreaks; |
|
|
749 inv_lbreaks = itemp; |
|
|
750 rl_display_fixed = 0; |
|
|
751 /* If we are displaying on a single line, and last_lmargin is > 0, we |
|
|
752 are not displaying any invisible characters, so set visible_wrap_offset |
|
|
753 to 0. */ |
|
|
754 if (_rl_horizontal_scroll_mode && last_lmargin) |
|
|
755 visible_wrap_offset = 0; |
|
|
756 else |
|
|
757 visible_wrap_offset = wrap_offset; |
|
|
758 } |
|
|
759 } |
|
|
760 |
|
|
761 /* PWP: update_line() is based on finding the middle difference of each |
|
|
762 line on the screen; vis: |
|
|
763 |
|
|
764 /old first difference |
|
|
765 /beginning of line | /old last same /old EOL |
|
|
766 v v v v |
|
|
767 old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as |
|
|
768 new: eddie> Oh, my little buggy says to me, as lurgid as |
|
|
769 ^ ^ ^ ^ |
|
|
770 \beginning of line | \new last same \new end of line |
|
|
771 \new first difference |
|
|
772 |
|
|
773 All are character pointers for the sake of speed. Special cases for |
|
|
774 no differences, as well as for end of line additions must be handeled. |
|
|
775 |
|
|
776 Could be made even smarter, but this works well enough */ |
|
|
777 static void |
|
|
778 update_line (old, new, current_line, omax, nmax, inv_botlin) |
|
|
779 register char *old, *new; |
|
|
780 int current_line, omax, nmax, inv_botlin; |
|
|
781 { |
|
|
782 register char *ofd, *ols, *oe, *nfd, *nls, *ne; |
|
|
783 int temp, lendiff, wsatend, od, nd; |
|
|
784 int current_invis_chars; |
|
|
785 |
|
|
786 /* If we're at the right edge of a terminal that supports xn, we're |
|
|
787 ready to wrap around, so do so. This fixes problems with knowing |
|
|
788 the exact cursor position and cut-and-paste with certain terminal |
|
|
789 emulators. In this calculation, TEMP is the physical screen |
|
|
790 position of the cursor. */ |
|
|
791 temp = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset); |
|
|
792 if (temp == screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode |
|
|
793 && _rl_last_v_pos == current_line - 1) |
|
|
794 { |
|
|
795 if (new[0]) |
|
|
796 putc (new[0], rl_outstream); |
|
|
797 else |
|
|
798 putc (' ', rl_outstream); |
|
|
799 _rl_last_c_pos = 1; /* XXX */ |
|
|
800 _rl_last_v_pos++; |
|
|
801 if (old[0] && new[0]) |
|
|
802 old[0] = new[0]; |
|
|
803 } |
|
|
804 |
|
|
805 /* Find first difference. */ |
|
|
806 for (ofd = old, nfd = new; |
|
|
807 (ofd - old < omax) && *ofd && (*ofd == *nfd); |
|
|
808 ofd++, nfd++) |
|
|
809 ; |
|
|
810 |
|
|
811 /* Move to the end of the screen line. ND and OD are used to keep track |
|
|
812 of the distance between ne and new and oe and old, respectively, to |
|
|
813 move a subtraction out of each loop. */ |
|
|
814 for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++); |
|
|
815 for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++); |
|
|
816 |
|
|
817 /* If no difference, continue to next line. */ |
|
|
818 if (ofd == oe && nfd == ne) |
|
|
819 return; |
|
|
820 |
|
|
821 wsatend = 1; /* flag for trailing whitespace */ |
|
|
822 ols = oe - 1; /* find last same */ |
|
|
823 nls = ne - 1; |
|
|
824 while ((ols > ofd) && (nls > nfd) && (*ols == *nls)) |
|
|
825 { |
|
|
826 if (*ols != ' ') |
|
|
827 wsatend = 0; |
|
|
828 ols--; |
|
|
829 nls--; |
|
|
830 } |
|
|
831 |
|
|
832 if (wsatend) |
|
|
833 { |
|
|
834 ols = oe; |
|
|
835 nls = ne; |
|
|
836 } |
|
|
837 else if (*ols != *nls) |
|
|
838 { |
|
|
839 if (*ols) /* don't step past the NUL */ |
|
|
840 ols++; |
|
|
841 if (*nls) |
|
|
842 nls++; |
|
|
843 } |
|
|
844 |
|
|
845 /* count of invisible characters in the current invisible line. */ |
|
|
846 current_invis_chars = W_OFFSET (current_line, wrap_offset); |
|
|
847 if (_rl_last_v_pos != current_line) |
|
|
848 { |
|
|
849 _rl_move_vert (current_line); |
|
|
850 if (current_line == 0 && visible_wrap_offset) |
|
|
851 _rl_last_c_pos += visible_wrap_offset; |
|
|
852 } |
|
|
853 |
|
|
854 /* If this is the first line and there are invisible characters in the |
|
|
855 prompt string, and the prompt string has not changed, and the current |
|
|
856 cursor position is before the last invisible character in the prompt, |
|
|
857 and the index of the character to move to is past the end of the prompt |
|
|
858 string, then redraw the entire prompt string. We can only do this |
|
|
859 reliably if the terminal supports a `cr' capability. |
|
|
860 |
|
|
861 This is not an efficiency hack -- there is a problem with redrawing |
|
|
862 portions of the prompt string if they contain terminal escape |
|
|
863 sequences (like drawing the `unbold' sequence without a corresponding |
|
|
864 `bold') that manifests itself on certain terminals. */ |
|
|
865 |
|
|
866 lendiff = local_prompt ? strlen (local_prompt) : 0; |
|
|
867 od = ofd - old; /* index of first difference in visible line */ |
|
|
868 if (current_line == 0 && !_rl_horizontal_scroll_mode && |
|
|
869 term_cr && lendiff > visible_length && _rl_last_c_pos > 0 && |
|
|
870 od > lendiff && _rl_last_c_pos < last_invisible) |
|
|
871 { |
|
|
872 tputs (term_cr, 1, _rl_output_character_function); |
|
|
873 _rl_output_some_chars (local_prompt, lendiff); |
|
|
874 _rl_last_c_pos = lendiff; |
|
|
875 } |
|
|
876 |
|
|
877 _rl_move_cursor_relative (od, old); |
|
|
878 |
|
|
879 /* if (len (new) > len (old)) */ |
|
|
880 lendiff = (nls - nfd) - (ols - ofd); |
|
|
881 |
|
|
882 /* If we are changing the number of invisible characters in a line, and |
|
|
883 the spot of first difference is before the end of the invisible chars, |
|
|
884 lendiff needs to be adjusted. */ |
|
|
885 if (current_line == 0 && !_rl_horizontal_scroll_mode && |
|
|
886 current_invis_chars != visible_wrap_offset) |
|
|
887 { |
|
|
888 temp = visible_wrap_offset - current_invis_chars; |
|
|
889 lendiff += temp; |
|
|
890 } |
|
|
891 |
|
|
892 /* Insert (diff (len (old), len (new)) ch. */ |
|
|
893 temp = ne - nfd; |
|
|
894 if (lendiff > 0) |
|
|
895 { |
|
|
896 /* Non-zero if we're increasing the number of lines. */ |
|
|
897 int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin; |
|
|
898 /* Sometimes it is cheaper to print the characters rather than |
|
|
899 use the terminal's capabilities. If we're growing the number |
|
|
900 of lines, make sure we actually cause the new line to wrap |
|
|
901 around on auto-wrapping terminals. */ |
|
|
902 if (terminal_can_insert && ((2 * temp) >= lendiff || term_IC) && (!_rl_term_autowrap || !gl)) |
|
|
903 { |
|
|
904 /* If lendiff > visible_length and _rl_last_c_pos == 0 and |
|
|
905 _rl_horizontal_scroll_mode == 1, inserting the characters with |
|
|
906 term_IC or term_ic will screw up the screen because of the |
|
|
907 invisible characters. We need to just draw them. */ |
|
|
908 if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 || |
|
|
909 lendiff <= visible_length || !current_invis_chars)) |
|
|
910 { |
|
|
911 insert_some_chars (nfd, lendiff); |
|
|
912 _rl_last_c_pos += lendiff; |
|
|
913 } |
|
|
914 else if (*ols == 0) |
|
|
915 { |
|
|
916 /* At the end of a line the characters do not have to |
|
|
917 be "inserted". They can just be placed on the screen. */ |
|
|
918 /* However, this screws up the rest of this block, which |
|
|
919 assumes you've done the insert because you can. */ |
|
|
920 _rl_output_some_chars (nfd, lendiff); |
|
|
921 _rl_last_c_pos += lendiff; |
|
|
922 } |
|
|
923 else |
|
|
924 { |
|
|
925 /* We have horizontal scrolling and we are not inserting at |
|
|
926 the end. We have invisible characters in this line. This |
|
|
927 is a dumb update. */ |
|
|
928 _rl_output_some_chars (nfd, temp); |
|
|
929 _rl_last_c_pos += temp; |
|
|
930 return; |
|
|
931 } |
|
|
932 /* Copy (new) chars to screen from first diff to last match. */ |
|
|
933 temp = nls - nfd; |
|
|
934 if ((temp - lendiff) > 0) |
|
|
935 { |
|
|
936 _rl_output_some_chars (nfd + lendiff, temp - lendiff); |
|
|
937 _rl_last_c_pos += temp - lendiff; |
|
|
938 } |
|
|
939 } |
|
|
940 else |
|
|
941 { |
|
|
942 /* cannot insert chars, write to EOL */ |
|
|
943 _rl_output_some_chars (nfd, temp); |
|
|
944 _rl_last_c_pos += temp; |
|
|
945 } |
|
|
946 } |
|
|
947 else /* Delete characters from line. */ |
|
|
948 { |
|
|
949 /* If possible and inexpensive to use terminal deletion, then do so. */ |
|
|
950 if (term_dc && (2 * temp) >= -lendiff) |
|
|
951 { |
|
|
952 /* If all we're doing is erasing the invisible characters in the |
|
|
953 prompt string, don't bother. It screws up the assumptions |
|
|
954 about what's on the screen. */ |
|
|
955 if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 && |
|
|
956 -lendiff == visible_wrap_offset) |
|
|
957 lendiff = 0; |
|
|
958 |
|
|
959 if (lendiff) |
|
|
960 delete_chars (-lendiff); /* delete (diff) characters */ |
|
|
961 |
|
|
962 /* Copy (new) chars to screen from first diff to last match */ |
|
|
963 temp = nls - nfd; |
|
|
964 if (temp > 0) |
|
|
965 { |
|
|
966 _rl_output_some_chars (nfd, temp); |
|
|
967 _rl_last_c_pos += temp; |
|
|
968 } |
|
|
969 } |
|
|
970 /* Otherwise, print over the existing material. */ |
|
|
971 else |
|
|
972 { |
|
|
973 if (temp > 0) |
|
|
974 { |
|
|
975 _rl_output_some_chars (nfd, temp); |
|
|
976 _rl_last_c_pos += temp; |
|
|
977 } |
|
|
978 lendiff = (oe - old) - (ne - new); |
|
|
979 if (_rl_term_autowrap && current_line < inv_botlin) |
|
|
980 space_to_eol (lendiff); |
|
|
981 else |
|
|
982 _rl_clear_to_eol (lendiff); |
|
|
983 } |
|
|
984 } |
|
|
985 } |
|
|
986 |
|
|
987 /* Tell the update routines that we have moved onto a new (empty) line. */ |
|
|
988 int |
|
|
989 rl_on_new_line () |
|
|
990 { |
|
|
991 if (visible_line) |
|
|
992 visible_line[0] = '\0'; |
|
|
993 |
|
|
994 _rl_last_c_pos = _rl_last_v_pos = 0; |
|
|
995 _rl_vis_botlin = last_lmargin = 0; |
|
|
996 if (vis_lbreaks) |
|
|
997 vis_lbreaks[0] = vis_lbreaks[1] = 0; |
|
|
998 visible_wrap_offset = 0; |
|
|
999 return 0; |
|
|
1000 } |
|
|
1001 |
|
|
1002 /* Actually update the display, period. */ |
|
|
1003 int |
|
|
1004 rl_forced_update_display () |
|
|
1005 { |
|
|
1006 if (visible_line) |
|
|
1007 { |
|
|
1008 register char *temp = visible_line; |
|
|
1009 |
|
|
1010 while (*temp) |
|
|
1011 *temp++ = '\0'; |
|
|
1012 } |
|
|
1013 rl_on_new_line (); |
|
|
1014 forced_display++; |
|
|
1015 (*rl_redisplay_function) (); |
|
|
1016 return 0; |
|
|
1017 } |
|
|
1018 |
|
|
1019 /* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices. |
|
|
1020 DATA is the contents of the screen line of interest; i.e., where |
|
|
1021 the movement is being done. */ |
|
|
1022 void |
|
|
1023 _rl_move_cursor_relative (new, data) |
|
|
1024 int new; |
|
|
1025 char *data; |
|
|
1026 { |
|
|
1027 register int i; |
|
|
1028 |
|
|
1029 /* If we don't have to do anything, then return. */ |
|
|
1030 if (_rl_last_c_pos == new) return; |
|
|
1031 |
|
|
1032 /* It may be faster to output a CR, and then move forwards instead |
|
|
1033 of moving backwards. */ |
|
|
1034 /* i == current physical cursor position. */ |
|
|
1035 i = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset); |
|
|
1036 if (new == 0 || CR_FASTER (new, _rl_last_c_pos) || |
|
|
1037 (_rl_term_autowrap && i == screenwidth)) |
|
|
1038 { |
|
|
1039 #if defined (__MSDOS__) |
|
|
1040 putc ('\r', rl_outstream); |
|
|
1041 #else |
|
|
1042 tputs (term_cr, 1, _rl_output_character_function); |
|
|
1043 #endif /* !__MSDOS__ */ |
|
|
1044 _rl_last_c_pos = 0; |
|
|
1045 } |
|
|
1046 |
|
|
1047 if (_rl_last_c_pos < new) |
|
|
1048 { |
|
|
1049 /* Move the cursor forward. We do it by printing the command |
|
|
1050 to move the cursor forward if there is one, else print that |
|
|
1051 portion of the output buffer again. Which is cheaper? */ |
|
|
1052 |
|
|
1053 /* The above comment is left here for posterity. It is faster |
|
|
1054 to print one character (non-control) than to print a control |
|
|
1055 sequence telling the terminal to move forward one character. |
|
|
1056 That kind of control is for people who don't know what the |
|
|
1057 data is underneath the cursor. */ |
|
|
1058 #if defined (HACK_TERMCAP_MOTION) |
|
|
1059 extern char *term_forward_char; |
|
|
1060 |
|
|
1061 if (term_forward_char) |
|
|
1062 for (i = _rl_last_c_pos; i < new; i++) |
|
|
1063 tputs (term_forward_char, 1, _rl_output_character_function); |
|
|
1064 else |
|
|
1065 for (i = _rl_last_c_pos; i < new; i++) |
|
|
1066 putc (data[i], rl_outstream); |
|
|
1067 #else |
|
|
1068 for (i = _rl_last_c_pos; i < new; i++) |
|
|
1069 putc (data[i], rl_outstream); |
|
|
1070 #endif /* HACK_TERMCAP_MOTION */ |
|
|
1071 } |
|
|
1072 else if (_rl_last_c_pos != new) |
|
|
1073 _rl_backspace (_rl_last_c_pos - new); |
|
|
1074 _rl_last_c_pos = new; |
|
|
1075 } |
|
|
1076 |
|
|
1077 /* PWP: move the cursor up or down. */ |
|
|
1078 void |
|
|
1079 _rl_move_vert (to) |
|
|
1080 int to; |
|
|
1081 { |
|
|
1082 register int delta, i; |
|
|
1083 |
|
|
1084 if (_rl_last_v_pos == to || to > screenheight) |
|
|
1085 return; |
|
|
1086 |
|
|
1087 #if defined (__GO32__) |
|
|
1088 { |
|
|
1089 int row, col; |
|
|
1090 |
|
|
1091 ScreenGetCursor (&row, &col); |
|
|
1092 ScreenSetCursor ((row + to - _rl_last_v_pos), col); |
|
|
1093 } |
|
|
1094 #else /* !__GO32__ */ |
|
|
1095 |
|
|
1096 if ((delta = to - _rl_last_v_pos) > 0) |
|
|
1097 { |
|
|
1098 for (i = 0; i < delta; i++) |
|
|
1099 putc ('\n', rl_outstream); |
|
|
1100 tputs (term_cr, 1, _rl_output_character_function); |
|
|
1101 _rl_last_c_pos = 0; |
|
|
1102 } |
|
|
1103 else |
|
|
1104 { /* delta < 0 */ |
|
|
1105 if (term_up && *term_up) |
|
|
1106 for (i = 0; i < -delta; i++) |
|
|
1107 tputs (term_up, 1, _rl_output_character_function); |
|
|
1108 } |
|
|
1109 #endif /* !__GO32__ */ |
|
|
1110 _rl_last_v_pos = to; /* Now TO is here */ |
|
|
1111 } |
|
|
1112 |
|
|
1113 /* Physically print C on rl_outstream. This is for functions which know |
|
|
1114 how to optimize the display. Return the number of characters output. */ |
|
|
1115 int |
|
|
1116 rl_show_char (c) |
|
|
1117 int c; |
|
|
1118 { |
|
|
1119 int n = 1; |
|
|
1120 if (META_CHAR (c) && (_rl_output_meta_chars == 0)) |
|
|
1121 { |
|
|
1122 fprintf (rl_outstream, "M-"); |
|
|
1123 n += 2; |
|
|
1124 c = UNMETA (c); |
|
|
1125 } |
|
|
1126 |
|
|
1127 #if defined (DISPLAY_TABS) |
|
|
1128 if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT) |
|
|
1129 #else |
|
|
1130 if (CTRL_CHAR (c) || c == RUBOUT) |
|
|
1131 #endif /* !DISPLAY_TABS */ |
|
|
1132 { |
|
|
1133 fprintf (rl_outstream, "C-"); |
|
|
1134 n += 2; |
|
|
1135 c = CTRL_CHAR (c) ? UNCTRL (c) : '?'; |
|
|
1136 } |
|
|
1137 |
|
|
1138 putc (c, rl_outstream); |
|
|
1139 fflush (rl_outstream); |
|
|
1140 return n; |
|
|
1141 } |
|
|
1142 |
|
|
1143 int |
|
|
1144 rl_character_len (c, pos) |
|
|
1145 register int c, pos; |
|
|
1146 { |
|
|
1147 unsigned char uc; |
|
|
1148 |
|
|
1149 uc = (unsigned char)c; |
|
|
1150 |
|
|
1151 if (META_CHAR (uc)) |
|
|
1152 return ((_rl_output_meta_chars == 0) ? 4 : 1); |
|
|
1153 |
|
|
1154 if (uc == '\t') |
|
|
1155 { |
|
|
1156 #if defined (DISPLAY_TABS) |
|
|
1157 return (((pos | 7) + 1) - pos); |
|
|
1158 #else |
|
|
1159 return (2); |
|
|
1160 #endif /* !DISPLAY_TABS */ |
|
|
1161 } |
|
|
1162 |
|
|
1163 if (CTRL_CHAR (c) || c == RUBOUT) |
|
|
1164 return (2); |
|
|
1165 |
|
|
1166 return ((isprint (uc)) ? 1 : 2); |
|
|
1167 } |
|
|
1168 |
|
|
1169 /* How to print things in the "echo-area". The prompt is treated as a |
|
|
1170 mini-modeline. */ |
|
|
1171 |
|
|
1172 #if defined (USE_VARARGS) |
|
|
1173 int |
|
|
1174 #if defined (PREFER_STDARG) |
|
|
1175 rl_message (const char *format, ...) |
|
|
1176 #else |
|
|
1177 rl_message (va_alist) |
|
|
1178 va_dcl |
|
|
1179 #endif |
|
|
1180 { |
|
|
1181 va_list args; |
|
|
1182 #if defined (PREFER_VARARGS) |
|
|
1183 char *format; |
|
|
1184 #endif |
|
|
1185 |
|
|
1186 #if defined (PREFER_STDARG) |
|
|
1187 va_start (args, format); |
|
|
1188 #else |
|
|
1189 va_start (args); |
|
|
1190 format = va_arg (args, char *); |
|
|
1191 #endif |
|
|
1192 |
|
|
1193 vsprintf (msg_buf, format, args); |
|
|
1194 va_end (args); |
|
|
1195 |
|
|
1196 rl_display_prompt = msg_buf; |
|
|
1197 (*rl_redisplay_function) (); |
|
|
1198 return 0; |
|
|
1199 } |
|
|
1200 #else /* !USE_VARARGS */ |
|
|
1201 int |
|
|
1202 rl_message (format, arg1, arg2) |
|
|
1203 char *format; |
|
|
1204 { |
|
|
1205 sprintf (msg_buf, format, arg1, arg2); |
|
|
1206 rl_display_prompt = msg_buf; |
|
|
1207 (*rl_redisplay_function) (); |
|
|
1208 return 0; |
|
|
1209 } |
|
|
1210 #endif /* !USE_VARARGS */ |
|
|
1211 |
|
|
1212 /* How to clear things from the "echo-area". */ |
|
|
1213 int |
|
|
1214 rl_clear_message () |
|
|
1215 { |
|
|
1216 rl_display_prompt = rl_prompt; |
|
|
1217 (*rl_redisplay_function) (); |
|
|
1218 return 0; |
|
|
1219 } |
|
|
1220 |
|
|
1221 int |
|
|
1222 rl_reset_line_state () |
|
|
1223 { |
|
|
1224 rl_on_new_line (); |
|
|
1225 |
|
|
1226 rl_display_prompt = rl_prompt ? rl_prompt : ""; |
|
|
1227 forced_display = 1; |
|
|
1228 return 0; |
|
|
1229 } |
|
|
1230 |
|
|
1231 static char *saved_local_prompt; |
|
|
1232 static char *saved_local_prefix; |
|
|
1233 static int saved_last_invisible; |
|
|
1234 static int saved_visible_length; |
|
|
1235 |
|
|
1236 void |
|
|
1237 _rl_save_prompt () |
|
|
1238 { |
|
|
1239 saved_local_prompt = local_prompt; |
|
|
1240 saved_local_prefix = local_prompt_prefix; |
|
|
1241 saved_last_invisible = last_invisible; |
|
|
1242 saved_visible_length = visible_length; |
|
|
1243 |
|
|
1244 local_prompt = local_prompt_prefix = (char *)0; |
|
|
1245 last_invisible = visible_length = 0; |
|
|
1246 } |
|
|
1247 |
|
|
1248 void |
|
|
1249 _rl_restore_prompt () |
|
|
1250 { |
|
|
1251 if (local_prompt) |
|
|
1252 free (local_prompt); |
|
|
1253 if (local_prompt_prefix) |
|
|
1254 free (local_prompt_prefix); |
|
|
1255 |
|
|
1256 local_prompt = saved_local_prompt; |
|
|
1257 local_prompt_prefix = saved_local_prefix; |
|
|
1258 last_invisible = saved_last_invisible; |
|
|
1259 visible_length = saved_visible_length; |
|
|
1260 } |
|
|
1261 |
|
|
1262 char * |
|
|
1263 _rl_make_prompt_for_search (pchar) |
|
|
1264 int pchar; |
|
|
1265 { |
|
|
1266 int len; |
|
|
1267 char *pmt; |
|
|
1268 |
|
|
1269 _rl_save_prompt (); |
|
|
1270 |
|
|
1271 if (saved_local_prompt == 0) |
|
|
1272 { |
|
|
1273 len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0; |
|
|
1274 pmt = xmalloc (len + 2); |
|
|
1275 if (len) |
|
|
1276 strcpy (pmt, rl_prompt); |
|
|
1277 pmt[len] = pchar; |
|
|
1278 pmt[len+1] = '\0'; |
|
|
1279 } |
|
|
1280 else |
|
|
1281 { |
|
|
1282 len = *saved_local_prompt ? strlen (saved_local_prompt) : 0; |
|
|
1283 pmt = xmalloc (len + 2); |
|
|
1284 if (len) |
|
|
1285 strcpy (pmt, saved_local_prompt); |
|
|
1286 pmt[len] = pchar; |
|
|
1287 pmt[len+1] = '\0'; |
|
|
1288 local_prompt = savestring (pmt); |
|
|
1289 last_invisible = saved_last_invisible; |
|
|
1290 visible_length = saved_visible_length + 1; |
|
|
1291 } |
|
|
1292 return pmt; |
|
|
1293 } |
|
|
1294 |
|
|
1295 /* Quick redisplay hack when erasing characters at the end of the line. */ |
|
|
1296 void |
|
|
1297 _rl_erase_at_end_of_line (l) |
|
|
1298 int l; |
|
|
1299 { |
|
|
1300 register int i; |
|
|
1301 |
|
|
1302 _rl_backspace (l); |
|
|
1303 for (i = 0; i < l; i++) |
|
|
1304 putc (' ', rl_outstream); |
|
|
1305 _rl_backspace (l); |
|
|
1306 for (i = 0; i < l; i++) |
|
|
1307 visible_line[--_rl_last_c_pos] = '\0'; |
|
|
1308 rl_display_fixed++; |
|
|
1309 } |
|
|
1310 |
|
|
1311 /* Clear to the end of the line. COUNT is the minimum |
|
|
1312 number of character spaces to clear, */ |
|
|
1313 void |
|
|
1314 _rl_clear_to_eol (count) |
|
|
1315 int count; |
|
|
1316 { |
|
|
1317 #if !defined (__GO32__) |
|
|
1318 if (term_clreol) |
|
|
1319 tputs (term_clreol, 1, _rl_output_character_function); |
|
|
1320 else if (count) |
|
|
1321 #endif /* !__GO32__ */ |
|
|
1322 space_to_eol (count); |
|
|
1323 } |
|
|
1324 |
|
|
1325 /* Clear to the end of the line using spaces. COUNT is the minimum |
|
|
1326 number of character spaces to clear, */ |
|
|
1327 static void |
|
|
1328 space_to_eol (count) |
|
|
1329 int count; |
|
|
1330 { |
|
|
1331 register int i; |
|
|
1332 |
|
|
1333 for (i = 0; i < count; i++) |
|
|
1334 putc (' ', rl_outstream); |
|
|
1335 |
|
|
1336 _rl_last_c_pos += count; |
|
|
1337 } |
|
|
1338 |
|
|
1339 void |
|
|
1340 _rl_clear_screen () |
|
|
1341 { |
|
|
1342 #if !defined (__GO32__) |
|
|
1343 if (term_clrpag) |
|
|
1344 tputs (term_clrpag, 1, _rl_output_character_function); |
|
|
1345 else |
|
|
1346 #endif /* !__GO32__ */ |
|
|
1347 crlf (); |
|
|
1348 } |
|
|
1349 |
|
|
1350 /* Insert COUNT characters from STRING to the output stream. */ |
|
|
1351 static void |
|
|
1352 insert_some_chars (string, count) |
|
|
1353 char *string; |
|
|
1354 int count; |
|
|
1355 { |
|
|
1356 #if defined (__GO32__) |
|
|
1357 int row, col, width; |
|
|
1358 char *row_start; |
|
|
1359 |
|
|
1360 ScreenGetCursor (&row, &col); |
|
|
1361 width = ScreenCols (); |
|
|
1362 row_start = ScreenPrimary + (row * width); |
|
|
1363 |
|
|
1364 memcpy (row_start + col + count, row_start + col, width - col - count); |
|
|
1365 |
|
|
1366 /* Place the text on the screen. */ |
|
|
1367 _rl_output_some_chars (string, count); |
|
|
1368 #else /* !_GO32 */ |
|
|
1369 |
|
|
1370 /* If IC is defined, then we do not have to "enter" insert mode. */ |
|
|
1371 if (term_IC) |
|
|
1372 { |
|
|
1373 char *buffer; |
|
|
1374 buffer = tgoto (term_IC, 0, count); |
|
|
1375 tputs (buffer, 1, _rl_output_character_function); |
|
|
1376 _rl_output_some_chars (string, count); |
|
|
1377 } |
|
|
1378 else |
|
|
1379 { |
|
|
1380 register int i; |
|
|
1381 |
|
|
1382 /* If we have to turn on insert-mode, then do so. */ |
|
|
1383 if (term_im && *term_im) |
|
|
1384 tputs (term_im, 1, _rl_output_character_function); |
|
|
1385 |
|
|
1386 /* If there is a special command for inserting characters, then |
|
|
1387 use that first to open up the space. */ |
|
|
1388 if (term_ic && *term_ic) |
|
|
1389 { |
|
|
1390 for (i = count; i--; ) |
|
|
1391 tputs (term_ic, 1, _rl_output_character_function); |
|
|
1392 } |
|
|
1393 |
|
|
1394 /* Print the text. */ |
|
|
1395 _rl_output_some_chars (string, count); |
|
|
1396 |
|
|
1397 /* If there is a string to turn off insert mode, we had best use |
|
|
1398 it now. */ |
|
|
1399 if (term_ei && *term_ei) |
|
|
1400 tputs (term_ei, 1, _rl_output_character_function); |
|
|
1401 } |
|
|
1402 #endif /* !__GO32__ */ |
|
|
1403 } |
|
|
1404 |
|
|
1405 /* Delete COUNT characters from the display line. */ |
|
|
1406 static void |
|
|
1407 delete_chars (count) |
|
|
1408 int count; |
|
|
1409 { |
|
|
1410 #if defined (__GO32__) |
|
|
1411 int row, col, width; |
|
|
1412 char *row_start; |
|
|
1413 |
|
|
1414 ScreenGetCursor (&row, &col); |
|
|
1415 width = ScreenCols (); |
|
|
1416 row_start = ScreenPrimary + (row * width); |
|
|
1417 |
|
|
1418 memcpy (row_start + col, row_start + col + count, width - col - count); |
|
|
1419 memset (row_start + width - count, 0, count * 2); |
|
|
1420 #else /* !_GO32 */ |
|
|
1421 |
|
|
1422 if (count > screenwidth) /* XXX */ |
|
|
1423 return; |
|
|
1424 |
|
|
1425 if (term_DC && *term_DC) |
|
|
1426 { |
|
|
1427 char *buffer; |
|
|
1428 buffer = tgoto (term_DC, count, count); |
|
|
1429 tputs (buffer, count, _rl_output_character_function); |
|
|
1430 } |
|
|
1431 else |
|
|
1432 { |
|
|
1433 if (term_dc && *term_dc) |
|
|
1434 while (count--) |
|
|
1435 tputs (term_dc, 1, _rl_output_character_function); |
|
|
1436 } |
|
|
1437 #endif /* !__GO32__ */ |
|
|
1438 } |
|
|
1439 |
|
|
1440 void |
|
|
1441 _rl_update_final () |
|
|
1442 { |
|
|
1443 int full_lines; |
|
|
1444 |
|
|
1445 full_lines = 0; |
|
|
1446 /* If the cursor is the only thing on an otherwise-blank last line, |
|
|
1447 compensate so we don't print an extra CRLF. */ |
|
|
1448 if (_rl_vis_botlin && _rl_last_c_pos == 0 && |
|
|
1449 visible_line[vis_lbreaks[_rl_vis_botlin]] == 0) |
|
|
1450 { |
|
|
1451 _rl_vis_botlin--; |
|
|
1452 full_lines = 1; |
|
|
1453 } |
|
|
1454 _rl_move_vert (_rl_vis_botlin); |
|
|
1455 /* If we've wrapped lines, remove the final xterm line-wrap flag. */ |
|
|
1456 if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == screenwidth)) |
|
|
1457 { |
|
|
1458 char *last_line; |
|
|
1459 last_line = &visible_line[inv_lbreaks[_rl_vis_botlin]]; |
|
|
1460 _rl_move_cursor_relative (screenwidth - 1, last_line); |
|
|
1461 _rl_clear_to_eol (0); |
|
|
1462 putc (last_line[screenwidth - 1], rl_outstream); |
|
|
1463 } |
|
|
1464 _rl_vis_botlin = 0; |
|
|
1465 crlf (); |
|
|
1466 fflush (rl_outstream); |
|
|
1467 rl_display_fixed++; |
|
|
1468 } |
|
|
1469 |
|
|
1470 /* Move to the start of the current line. */ |
|
|
1471 static void |
|
|
1472 cr () |
|
|
1473 { |
|
|
1474 if (term_cr) |
|
|
1475 { |
|
|
1476 tputs (term_cr, 1, _rl_output_character_function); |
|
|
1477 _rl_last_c_pos = 0; |
|
|
1478 } |
|
|
1479 } |
|
|
1480 |
|
|
1481 /* Redisplay the current line after a SIGWINCH is received. */ |
|
|
1482 void |
|
|
1483 _rl_redisplay_after_sigwinch () |
|
|
1484 { |
|
|
1485 char *t, *oldp; |
|
|
1486 |
|
|
1487 /* Clear the current line and put the cursor at column 0. Make sure |
|
|
1488 the right thing happens if we have wrapped to a new screen line. */ |
|
|
1489 if (term_cr) |
|
|
1490 { |
|
|
1491 tputs (term_cr, 1, _rl_output_character_function); |
|
|
1492 _rl_last_c_pos = 0; |
|
|
1493 if (term_clreol) |
|
|
1494 tputs (term_clreol, 1, _rl_output_character_function); |
|
|
1495 else |
|
|
1496 { |
|
|
1497 space_to_eol (screenwidth); |
|
|
1498 tputs (term_cr, 1, _rl_output_character_function); |
|
|
1499 } |
|
|
1500 if (_rl_last_v_pos > 0) |
|
|
1501 _rl_move_vert (0); |
|
|
1502 } |
|
|
1503 else |
|
|
1504 crlf (); |
|
|
1505 |
|
|
1506 /* Redraw only the last line of a multi-line prompt. */ |
|
|
1507 t = strrchr (rl_display_prompt, '\n'); |
|
|
1508 if (t) |
|
|
1509 { |
|
|
1510 oldp = rl_display_prompt; |
|
|
1511 rl_display_prompt = ++t; |
|
|
1512 rl_forced_update_display (); |
|
|
1513 rl_display_prompt = oldp; |
|
|
1514 } |
|
|
1515 else |
|
|
1516 rl_forced_update_display (); |
|
|
1517 } |
|
|
1518 |
|
|
1519 void |
|
|
1520 _rl_clean_up_for_exit () |
|
|
1521 { |
|
|
1522 if (readline_echoing_p) |
|
|
1523 { |
|
|
1524 _rl_move_vert (_rl_vis_botlin); |
|
|
1525 _rl_vis_botlin = 0; |
|
|
1526 fflush (rl_outstream); |
|
|
1527 rl_restart_output (); |
|
|
1528 } |
|
|
1529 } |
