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0
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1 /* Cursor motion subroutines for XEmacs.
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2 Copyright (C) 1985, 1994, 1995 Free Software Foundation, Inc.
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3 loosely based primarily on public domain code written by Chris Torek
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.30. Substantially different from FSF. */
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23
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24 /* #### This file is extremely junky and needs major fixup. */
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25
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26 #include <config.h>
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27 #include "lisp.h"
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28
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29 #include "console-tty.h"
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30 #include "frame.h"
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31 #include "lstream.h"
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32 #include "redisplay.h"
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33
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34 #define EXPENSIVE 2000
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35
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36 extern char *tgoto (CONST char *cm, int hpos, int vpos);
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37 extern void tputs (CONST char *, int, void (*)(int));
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38
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39 static void cmgoto_for_real (struct console *c, int row, int col);
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40
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41 static int cm_cost_counter; /* sums up costs */
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42
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43 void evalcost (int c);
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44 void
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45 evalcost (int c)
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46 {
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47 cm_cost_counter++;
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48 }
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49
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50 /* Ugh -- cmputc() can't take a console argument, so we pass it in a global */
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51 struct console *cmputc_console;
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52
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53 void
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54 send_string_to_tty_console (struct console *c, unsigned char *str, int len)
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55 {
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56 /* #### Ben sez: don't some terminals need nulls outputted
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57 for proper timing? */
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58 Lstream *lstr = XLSTREAM (CONSOLE_TTY_DATA (c)->outstream);
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59
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60 if (CONSOLE_TTY_REAL_CURSOR_X (c) != CONSOLE_TTY_CURSOR_X (c)
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61 || CONSOLE_TTY_REAL_CURSOR_Y (c) != CONSOLE_TTY_CURSOR_Y (c))
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62 {
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63 int row = CONSOLE_TTY_CURSOR_Y (c);
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64 int col = CONSOLE_TTY_CURSOR_X (c);
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65 cmgoto_for_real (c, row, col);
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66 }
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67
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68 if (len == 1)
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69 Lstream_putc (lstr, *str);
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70 else if (len > 0)
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71 Lstream_write (lstr, str, len);
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72 }
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73
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74 void
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75 cmputc (int c)
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76 {
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77 unsigned char ch = (unsigned char) c;
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78
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79 if (termscript)
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80 fputc (c, termscript);
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81
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82 send_string_to_tty_console (cmputc_console, &ch, 1);
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83 }
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84
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85 #if 0
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86
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87 /*
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88 * Terminals with magicwrap (xn) don't all behave identically.
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89 * The VT100 leaves the cursor in the last column but will wrap before
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90 * printing the next character. I hear that the Concept terminal does
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91 * the wrap immediately but ignores the next newline it sees. And some
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92 * terminals just have buggy firmware, and think that the cursor is still
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93 * in limbo if we use direct cursor addressing from the phantom column.
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94 * The only guaranteed safe thing to do is to emit a CRLF immediately
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95 * after we reach the last column; this takes us to a known state.
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96 */
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97 void
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98 cmcheckmagic (void)
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99 {
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100 if (curX == FrameCols)
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101 {
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102 if (!MagicWrap || curY >= FrameRows - 1)
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103 abort ();
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104 if (termscript)
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105 putc ('\r', termscript);
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106 putchar ('\r');
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107 if (termscript)
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108 putc ('\n', termscript);
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109 putchar ('\n');
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110 curX = 0;
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111 curY++;
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112 }
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113 }
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114
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115 #endif /* 0 */
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116
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117 /*
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118 * (Re)Initialize the cost factors, given the output speed of the
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119 * terminal in DEVICE_TTY_DATA (dev)->ospeed. (Note: this holds B300,
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120 * B9600, etc -- ie stuff out of <sgtty.h>.)
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121 */
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122 void
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123 cm_cost_init (struct console *c)
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124 {
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125 char *tmp;
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126
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127 cm_cost_counter = 0;
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128 #define COST(x,e) (x \
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129 ? (cm_cost_counter = 0, tputs (x, 1, e), cm_cost_counter) \
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130 : EXPENSIVE)
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131 #define MINCOST(x,e) ((x == 0) \
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132 ? EXPENSIVE \
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133 : (tmp = tgoto(x, 0, 0), COST(tmp,e)))
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134
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135 TTY_COST (c).cm_up = COST (TTY_CM (c).up, evalcost);
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136 TTY_COST (c).cm_down = COST (TTY_CM (c).down, evalcost);
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137 TTY_COST (c).cm_left = COST (TTY_CM (c).left, evalcost);
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138 TTY_COST (c).cm_right = COST (TTY_CM (c).right, evalcost);
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139 TTY_COST (c).cm_home = COST (TTY_CM (c).home, evalcost);
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140 TTY_COST (c).cm_low_left = COST (TTY_CM (c).low_left, evalcost);
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141 TTY_COST (c).cm_car_return = COST (TTY_CM (c).car_return, evalcost);
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142
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143 /*
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144 * These last three are actually minimum costs. When (if) they are
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145 * candidates for the least-cost motion, the real cost is computed.
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146 * (Note that "0" is the assumed to generate the minimum cost.
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147 * While this is not necessarily true, I have yet to see a terminal
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148 * for which is not; all the terminals that have variable-cost
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149 * cursor motion seem to take straight numeric values. --ACT)
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150 */
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151
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152 TTY_COST (c).cm_abs = MINCOST (TTY_CM (c).abs, evalcost);
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153 TTY_COST (c).cm_hor_abs = MINCOST (TTY_CM (c).hor_abs, evalcost);
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154 TTY_COST (c).cm_ver_abs = MINCOST (TTY_CM (c).ver_abs, evalcost);
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155
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156 #undef MINCOST
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157 #undef COST
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158 }
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159
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160 /*
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161 * Calculate the cost to move from (srcy, srcx) to (dsty, dstx) using
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162 * up and down, and left and right, and motions. If doit is set
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163 * actually perform the motion.
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164 */
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165
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166 #ifdef NOT_YET
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167 static int
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168 calccost (struct frame *f, int srcy, int srcx, int dsty, int dstx, int doit)
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169 {
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170 struct console *c = XCONSOLE (FRAME_CONSOLE (f));
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171 int totalcost = 0;
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172 int deltay, deltax;
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173 char *motion;
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174 int motion_cost;
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175
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176 #if 0
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177 int ntabs, n2tabs, tabx, tab2x, tabcost;
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178 #endif
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179
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180 cmputc_console = c;
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181 #if 0
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182 /* If have just wrapped on a terminal with xn,
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183 don't believe the cursor position: give up here
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184 and force use of absolute positioning. */
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185 if (curX == Wcm.cm_cols)
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186 goto fail;
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187 #endif
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188
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189 deltay = dsty - srcy;
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190 if (!deltay)
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191 goto calculate_x;
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192
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193 if (deltay < 0)
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194 {
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195 motion = TTY_CM (c).up;
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196 motion_cost = TTY_COST (c).cm_up;
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197 deltay = -deltay;
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198 }
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199 else
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200 {
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201 motion = TTY_CM (c).down;
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202 motion_cost = TTY_COST (c).cm_down;
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203 }
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204
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205 if (motion_cost == EXPENSIVE)
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206 {
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207 /* if (doit) */
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208 /* #### printing OOF is not acceptable */
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209 return motion_cost;
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210 }
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211
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212 totalcost = motion_cost * deltay;
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213
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214 if (doit)
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215 while (--deltay >= 0)
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216 tputs (motion, 1, cmputc);
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217
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218 calculate_x:
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219
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220 deltax = dstx - srcx;
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221 if (!deltax)
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222 goto done;
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223
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224 if (deltax < 0)
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225 {
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226 motion = TTY_CM (c).left;
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227 motion_cost = TTY_COST (c).cm_left;
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228 deltax = -deltax;
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229 }
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230 else
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231 {
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232 motion = TTY_CM (c).right;
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233 motion_cost = TTY_COST (c).cm_right;
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234 }
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235
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236 if (motion_cost == EXPENSIVE)
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237 {
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238 /* if (doit) */
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239 /* #### printing OOF is not acceptable */
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240 return motion_cost;
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241 }
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242
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243 totalcost += motion_cost * deltax;
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244
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245 if (doit)
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246 while (--deltax >= 0)
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247 tputs (motion, 1, cmputc);
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248
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249 done:
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250 return totalcost;
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251 }
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252 #endif /* NOT_YET */
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253
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254 #define USEREL 0
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255 #define USEHOME 1
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256 #define USELL 2
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257 #define USECR 3
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258
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259 #if OLD_CURSOR_MOTION_SHIT
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260 void
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261 cmgoto (struct frame *f, int row, int col)
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262 {
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263 struct console *c = XCONSOLE (FRAME_CONSOLE (f));
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264 char *motion;
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265 #if 0
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266 int frame_x = FRAME_CURSOR_X(f);
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267 int frame_y = FRAME_CURSOR_Y(f);
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268 int relcost, directcost, llcost;
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269 int homecost;
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270 int use;
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271 char *dcm;
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272 #endif
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273
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274 cmputc_console = c;
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275
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276 /* First the degenerate case */
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277 #if 0
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278 if (row == frame_y && col == frame_x)
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279 return;
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280 #endif
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281
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282 /* #### something is fucked with the non-absolute cases */
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283 motion = tgoto (TTY_CM (c).abs, col, row);
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284 tputs (motion, 1, cmputc);
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285 CONSOLE_TTY_DATA (c)->cursor_x = col;
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286 CONSOLE_TTY_DATA (c)->cursor_y = row;
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287 return;
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288
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289 #if 0
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290 if (frame_y >= 0 && frame_x >= 0)
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291 {
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292 /*
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293 * Pick least-cost motions
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294 */
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295
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296 relcost = calccost (f, frame_y, frame_x, row, col, 0);
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297 use = USEREL;
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298
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299 homecost = TTY_COST (c).cm_home;
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300 if (homecost < EXPENSIVE)
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301 homecost += calccost (f, 0, 0, row, col, 0);
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302
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303 if (homecost < relcost)
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304 {
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305 relcost = homecost;
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306 use = USEHOME;
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307 }
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308
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309 llcost = TTY_COST (c).cm_low_left;
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310 if (llcost < EXPENSIVE)
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311 llcost += calccost (f, frame_y - 1, 0, row, col, 0);
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312
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313 if (llcost < relcost)
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314 {
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315 relcost = llcost;
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316 use = USELL;
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317 }
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318
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319 #if 0
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320 if ((crcost = Wcm.cc_cr) < BIG) {
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321 if (Wcm.cm_autolf)
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322 if (curY + 1 >= Wcm.cm_rows)
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323 crcost = BIG;
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324 else
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325 crcost += calccost (curY + 1, 0, row, col, 0);
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326 else
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327 crcost += calccost (curY, 0, row, col, 0);
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328 }
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329 if (crcost < relcost)
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330 relcost = crcost, use = USECR;
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331 #endif
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332
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333 directcost = TTY_COST (c).cm_abs;
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334 dcm = TTY_CM (c).abs;
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335
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336 if (row == frame_y && TTY_COST (c).cm_hor_abs < EXPENSIVE)
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337 {
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338 directcost = TTY_COST (c).cm_hor_abs;
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339 dcm = TTY_CM (c).hor_abs;
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340 }
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341 else if (col == frame_x && TTY_COST (c).cm_ver_abs < EXPENSIVE)
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342 {
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343 directcost = TTY_COST (c).cm_ver_abs;
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344 dcm = TTY_CM (c).ver_abs;
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345 }
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346 }
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347 else
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348 {
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349 directcost = 0;
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350 relcost = 100000;
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351 dcm = TTY_CM (c).abs;
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352 }
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353
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354 /*
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355 * In the following comparison, the = in <= is because when the costs
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356 * are the same, it looks nicer (I think) to move directly there.
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357 */
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358 if (directcost <= relcost)
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359 {
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360 /* compute REAL direct cost */
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361 cm_cost_counter = 0;
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362 motion = (dcm == TTY_CM (c).hor_abs
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363 ? tgoto (dcm, row, col)
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364 : tgoto (dcm, col, row));
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365 tputs (motion, 1, evalcost);
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366 if (cm_cost_counter <= relcost)
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367 { /* really is cheaper */
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368 tputs (motion, 1, cmputc);
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369 FRAME_CURSOR_Y (f) = row;
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370 FRAME_CURSOR_X (f) = col;
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371 return;
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372 }
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373 }
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374
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375 switch (use)
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376 {
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377 case USEHOME:
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378 tputs (TTY_CM (c).home, 1, cmputc);
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379 FRAME_CURSOR_X (f) = 0;
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380 FRAME_CURSOR_Y (f) = 0;
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381 break;
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382
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383 case USELL:
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384 tputs (TTY_CM (c).low_left, 1, cmputc);
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385 FRAME_CURSOR_Y (f) = FRAME_HEIGHT (f) - 1;
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386 FRAME_CURSOR_X (f) = 0;
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387 break;
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388
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389 #if 0
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390 case USECR:
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391 tputs (Wcm.cm_cr, 1, cmputc);
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392 if (Wcm.cm_autolf)
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393 curY++;
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394 curX = 0;
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395 break;
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396 #endif
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397 }
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398
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399 (void) calccost (f, FRAME_CURSOR_Y (f), FRAME_CURSOR_X (f), row, col, 1);
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400 FRAME_CURSOR_Y (f) = row;
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401 FRAME_CURSOR_X (f) = col;
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402 #endif
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403 }
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404 #endif /* OLD_CURSOR_MOTION_SHIT */
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405
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406 /*****************************************************************************
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407 cmgoto
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408
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409 This function is responsible for getting the cursor from its current
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410 location to the passed location in the most efficient manner
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411 possible.
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412 ****************************************************************************/
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413 static void
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414 cmgoto_for_real (struct console *c, int row, int col)
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415 {
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416 char *motion;
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417
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418 cmputc_console = c;
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419
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420 /* First make sure that we actually have to do any work at all. */
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421 if (CONSOLE_TTY_REAL_CURSOR_X (c) == col
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422 && CONSOLE_TTY_REAL_CURSOR_Y (c) == row)
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423 return;
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424
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425 CONSOLE_TTY_REAL_CURSOR_X (c) = col;
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426 CONSOLE_TTY_REAL_CURSOR_Y (c) = row;
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427
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428 /* #### Need to reimplement cost analysis and potential relative
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429 movement. */
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430
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431 /* If all else fails, use absolute movement. */
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432 motion = tgoto (TTY_CM (c).abs, col, row);
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433 tputs (motion, 1, cmputc);
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434 CONSOLE_TTY_CURSOR_X (c) = col;
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435 CONSOLE_TTY_CURSOR_Y (c) = row;
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436 }
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437
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438 void
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439 cmgoto (struct frame *f, int row, int col)
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440 {
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441 /* We delay cursor motion until we do something other than cursor motion,
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442 to optimize the case where cmgoto() is called twice in a row. */
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443 struct console *c = XCONSOLE (FRAME_CONSOLE (f));
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444 CONSOLE_TTY_CURSOR_X (c) = col;
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445 CONSOLE_TTY_CURSOR_Y (c) = row;
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446 }
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447
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448 #if 0
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449 /* Clear out all terminal info.
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450 Used before copying into it the info on the actual terminal.
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451 */
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452
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453 void
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454 Wcm_clear (void)
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455 {
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456 memset (&Wcm, 0, sizeof Wcm);
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457 UP = 0;
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458 BC = 0;
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459 }
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460 #endif
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461
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462 #if 0
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463 /*
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464 * Initialized stuff
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465 * Return 0 if can do CM.
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466 * Return -1 if cannot.
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467 * Return -2 if size not specified.
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468 */
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469
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470 int
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471 Wcm_init (void)
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472 {
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473 #if 0
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474 if (Wcm.cm_abs && !Wcm.cm_ds)
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475 return 0;
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476 #endif
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477 if (Wcm.cm_abs)
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478 return 0;
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479 /* Require up and left, and, if no absolute, down and right */
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480 if (!Wcm.cm_up || !Wcm.cm_left)
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481 return - 1;
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482 if (!Wcm.cm_abs && (!Wcm.cm_down || !Wcm.cm_right))
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483 return - 1;
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484 /* Check that we know the size of the frame.... */
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485 if (Wcm.cm_rows <= 0 || Wcm.cm_cols <= 0)
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486 return - 2;
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487 return 0;
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488 }
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489 #endif
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