1 | /* ----------------------------------------------------------------------- * |
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2 | * |
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3 | * Copyright 2004-2008 H. Peter Anvin - All Rights Reserved |
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4 | * |
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5 | * Permission is hereby granted, free of charge, to any person |
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6 | * obtaining a copy of this software and associated documentation |
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7 | * files (the "Software"), to deal in the Software without |
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8 | * restriction, including without limitation the rights to use, |
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9 | * copy, modify, merge, publish, distribute, sublicense, and/or |
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10 | * sell copies of the Software, and to permit persons to whom |
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11 | * the Software is furnished to do so, subject to the following |
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12 | * conditions: |
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13 | * |
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14 | * The above copyright notice and this permission notice shall |
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15 | * be included in all copies or substantial portions of the Software. |
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16 | * |
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17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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18 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES |
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19 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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20 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
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21 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
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22 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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23 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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24 | * OTHER DEALINGS IN THE SOFTWARE. |
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25 | * |
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26 | * ----------------------------------------------------------------------- */ |
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27 | |
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28 | /* |
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29 | * ansi.c |
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30 | * |
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31 | * ANSI character code engine |
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32 | */ |
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33 | |
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34 | #include <string.h> |
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35 | #include <colortbl.h> |
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36 | #include "ansi.h" |
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37 | |
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38 | static const struct term_state default_state = { |
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39 | .state = st_init, |
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40 | .pvt = false, |
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41 | .nparms = 0, |
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42 | .xy = {0, 0}, |
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43 | .cindex = 0, /* First color table entry */ |
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44 | .vtgraphics = false, |
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45 | .intensity = 1, |
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46 | .underline = false, |
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47 | .blink = false, |
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48 | .reverse = false, |
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49 | .fg = 7, |
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50 | .bg = 0, |
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51 | .autocr = true, /* Mimic \n -> \r\n conversion by default */ |
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52 | .autowrap = true, /* Wrap lines by default */ |
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53 | .saved_xy = {0, 0}, |
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54 | .cursor = true, |
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55 | }; |
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56 | |
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57 | /* DEC VT graphics to codepage 437 table (characters 0x60-0x7F only) */ |
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58 | static const char decvt_to_cp437[] = { |
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59 | 0004, 0261, 0007, 0007, 0007, 0007, 0370, 0361, |
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60 | 0007, 0007, 0331, 0277, 0332, 0300, 0305, 0304, |
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61 | 0304, 0304, 0137, 0137, 0303, 0264, 0301, 0302, |
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62 | 0263, 0363, 0362, 0343, 0330, 0234, 0007, 00 |
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63 | }; |
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64 | |
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65 | void __ansi_init(const struct term_info *ti) |
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66 | { |
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67 | memcpy(ti->ts, &default_state, sizeof default_state); |
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68 | } |
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69 | |
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70 | void __ansi_putchar(const struct term_info *ti, uint8_t ch) |
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71 | { |
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72 | const struct ansi_ops *op = ti->op; |
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73 | struct term_state *st = ti->ts; |
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74 | const int rows = ti->rows; |
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75 | const int cols = ti->cols; |
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76 | struct curxy xy = st->xy; |
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77 | |
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78 | switch (st->state) { |
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79 | case st_init: |
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80 | switch (ch) { |
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81 | case 1 ... 5: |
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82 | st->state = st_tbl; |
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83 | st->parms[0] = ch; |
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84 | break; |
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85 | case '\a': |
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86 | op->beep(); |
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87 | break; |
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88 | case '\b': |
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89 | if (xy.x > 0) |
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90 | xy.x--; |
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91 | break; |
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92 | case '\t': |
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93 | { |
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94 | int nsp = 8 - (xy.x & 7); |
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95 | while (nsp--) |
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96 | __ansi_putchar(ti, ' '); |
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97 | } |
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98 | return; /* Cursor already updated */ |
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99 | case '\n': |
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100 | case '\v': |
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101 | case '\f': |
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102 | xy.y++; |
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103 | if (st->autocr) |
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104 | xy.x = 0; |
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105 | break; |
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106 | case '\r': |
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107 | xy.x = 0; |
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108 | break; |
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109 | case 127: |
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110 | /* Ignore delete */ |
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111 | break; |
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112 | case 14: |
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113 | st->vtgraphics = 1; |
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114 | break; |
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115 | case 15: |
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116 | st->vtgraphics = 0; |
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117 | break; |
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118 | case 27: |
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119 | st->state = st_esc; |
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120 | break; |
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121 | default: |
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122 | /* Print character */ |
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123 | if (ch >= 32) { |
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124 | if (st->vtgraphics && (ch & 0xe0) == 0x60) |
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125 | ch = decvt_to_cp437[ch - 0x60]; |
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126 | |
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127 | op->write_char(xy.x, xy.y, ch, st); |
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128 | xy.x++; |
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129 | } |
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130 | break; |
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131 | } |
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132 | break; |
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133 | |
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134 | case st_esc: |
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135 | switch (ch) { |
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136 | case '%': |
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137 | case '(': |
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138 | case ')': |
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139 | case '#': |
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140 | /* Ignore this plus the subsequent character, allows |
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141 | compatibility with Linux sequence to set charset */ |
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142 | break; |
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143 | case '[': |
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144 | st->state = st_csi; |
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145 | st->nparms = 0; |
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146 | st->pvt = false; |
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147 | memset(st->parms, 0, sizeof st->parms); |
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148 | break; |
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149 | case 'c': |
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150 | /* Reset terminal */ |
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151 | memcpy(&st, &default_state, sizeof st); |
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152 | op->erase(st, 0, 0, cols - 1, rows - 1); |
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153 | xy.x = xy.y = 0; |
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154 | st->state = st_init; |
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155 | break; |
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156 | default: |
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157 | /* Ignore sequence */ |
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158 | st->state = st_init; |
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159 | break; |
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160 | } |
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161 | break; |
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162 | |
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163 | case st_csi: |
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164 | { |
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165 | int p0 = st->parms[0] ? st->parms[0] : 1; |
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166 | |
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167 | if (ch >= '0' && ch <= '9') { |
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168 | st->parms[st->nparms] = st->parms[st->nparms] * 10 + (ch - '0'); |
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169 | } else if (ch == ';') { |
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170 | st->nparms++; |
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171 | if (st->nparms >= ANSI_MAX_PARMS) |
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172 | st->nparms = ANSI_MAX_PARMS - 1; |
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173 | break; |
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174 | } else if (ch == '?') { |
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175 | st->pvt = true; |
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176 | } else { |
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177 | switch (ch) { |
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178 | case 'A': |
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179 | { |
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180 | int y = xy.y - p0; |
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181 | xy.y = (y < 0) ? 0 : y; |
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182 | } |
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183 | break; |
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184 | case 'B': |
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185 | { |
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186 | int y = xy.y + p0; |
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187 | xy.y = (y >= rows) ? rows - 1 : y; |
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188 | } |
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189 | break; |
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190 | case 'C': |
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191 | { |
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192 | int x = xy.x + p0; |
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193 | xy.x = (x >= cols) ? cols - 1 : x; |
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194 | } |
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195 | break; |
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196 | case 'D': |
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197 | { |
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198 | int x = xy.x - p0; |
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199 | xy.x = (x < 0) ? 0 : x; |
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200 | } |
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201 | break; |
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202 | case 'E': |
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203 | { |
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204 | int y = xy.y + p0; |
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205 | xy.y = (y >= rows) ? rows - 1 : y; |
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206 | xy.x = 0; |
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207 | } |
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208 | break; |
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209 | case 'F': |
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210 | { |
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211 | int y = xy.y - p0; |
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212 | xy.y = (y < 0) ? 0 : y; |
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213 | xy.x = 0; |
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214 | } |
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215 | break; |
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216 | case 'G': |
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217 | case '\'': |
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218 | { |
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219 | int x = st->parms[0] - 1; |
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220 | xy.x = (x >= cols) ? cols - 1 : (x < 0) ? 0 : x; |
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221 | } |
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222 | break; |
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223 | case 'H': |
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224 | case 'f': |
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225 | { |
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226 | int y = st->parms[0] - 1; |
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227 | int x = st->parms[1] - 1; |
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228 | |
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229 | xy.x = (x >= cols) ? cols - 1 : (x < 0) ? 0 : x; |
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230 | xy.y = (y >= rows) ? rows - 1 : (y < 0) ? 0 : y; |
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231 | } |
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232 | break; |
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233 | case 'J': |
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234 | { |
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235 | switch (st->parms[0]) { |
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236 | case 0: |
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237 | op->erase(st, xy.x, xy.y, cols - 1, xy.y); |
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238 | if (xy.y < rows - 1) |
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239 | op->erase(st, 0, xy.y + 1, cols - 1, rows - 1); |
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240 | break; |
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241 | |
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242 | case 1: |
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243 | if (xy.y > 0) |
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244 | op->erase(st, 0, 0, cols - 1, xy.y - 1); |
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245 | if (xy.y > 0) |
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246 | op->erase(st, 0, xy.y, xy.x - 1, xy.y); |
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247 | break; |
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248 | |
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249 | case 2: |
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250 | op->erase(st, 0, 0, cols - 1, rows - 1); |
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251 | break; |
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252 | |
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253 | default: |
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254 | /* Ignore */ |
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255 | break; |
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256 | } |
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257 | } |
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258 | break; |
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259 | case 'K': |
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260 | { |
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261 | switch (st->parms[0]) { |
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262 | case 0: |
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263 | op->erase(st, xy.x, xy.y, cols - 1, xy.y); |
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264 | break; |
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265 | |
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266 | case 1: |
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267 | if (xy.x > 0) |
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268 | op->erase(st, 0, xy.y, xy.x - 1, xy.y); |
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269 | break; |
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270 | |
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271 | case 2: |
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272 | op->erase(st, 0, xy.y, cols - 1, xy.y); |
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273 | break; |
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274 | |
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275 | default: |
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276 | /* Ignore */ |
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277 | break; |
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278 | } |
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279 | } |
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280 | break; |
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281 | case 'h': |
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282 | case 'l': |
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283 | { |
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284 | bool set = (ch == 'h'); |
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285 | switch (st->parms[0]) { |
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286 | case 7: /* DECAWM */ |
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287 | st->autowrap = set; |
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288 | break; |
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289 | case 20: /* LNM */ |
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290 | st->autocr = set; |
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291 | break; |
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292 | case 25: /* DECTECM */ |
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293 | st->cursor = set; |
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294 | op->showcursor(st); |
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295 | break; |
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296 | default: |
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297 | /* Ignore */ |
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298 | break; |
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299 | } |
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300 | break; |
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301 | } |
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302 | case 'm': |
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303 | { |
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304 | static const int ansi2pc[8] = |
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305 | { 0, 4, 2, 6, 1, 5, 3, 7 }; |
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306 | |
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307 | int i; |
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308 | for (i = 0; i <= st->nparms; i++) { |
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309 | int a = st->parms[i]; |
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310 | switch (a) { |
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311 | case 0: |
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312 | st->fg = 7; |
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313 | st->bg = 0; |
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314 | st->intensity = 1; |
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315 | st->underline = 0; |
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316 | st->blink = 0; |
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317 | st->reverse = 0; |
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318 | break; |
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319 | case 1: |
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320 | st->intensity = 2; |
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321 | break; |
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322 | case 2: |
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323 | st->intensity = 0; |
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324 | break; |
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325 | case 4: |
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326 | st->underline = 1; |
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327 | break; |
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328 | case 5: |
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329 | st->blink = 1; |
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330 | break; |
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331 | case 7: |
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332 | st->reverse = 1; |
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333 | break; |
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334 | case 21: |
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335 | case 22: |
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336 | st->intensity = 1; |
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337 | break; |
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338 | case 24: |
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339 | st->underline = 0; |
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340 | break; |
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341 | case 25: |
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342 | st->blink = 0; |
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343 | break; |
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344 | case 27: |
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345 | st->reverse = 0; |
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346 | break; |
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347 | case 30 ... 37: |
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348 | st->fg = ansi2pc[a - 30]; |
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349 | break; |
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350 | case 38: |
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351 | st->fg = 7; |
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352 | st->underline = 1; |
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353 | break; |
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354 | case 39: |
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355 | st->fg = 7; |
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356 | st->underline = 0; |
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357 | break; |
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358 | case 40 ... 47: |
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359 | st->bg = ansi2pc[a - 40]; |
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360 | break; |
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361 | case 49: |
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362 | st->bg = 7; |
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363 | break; |
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364 | default: |
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365 | /* Do nothing */ |
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366 | break; |
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367 | } |
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368 | } |
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369 | } |
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370 | break; |
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371 | case 's': |
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372 | st->saved_xy = xy; |
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373 | break; |
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374 | case 'u': |
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375 | xy = st->saved_xy; |
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376 | break; |
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377 | default: /* Includes CAN and SUB */ |
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378 | break; /* Drop unknown sequence */ |
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379 | } |
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380 | st->state = st_init; |
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381 | } |
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382 | } |
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383 | break; |
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384 | |
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385 | case st_tbl: |
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386 | st->parms[1] = 0; |
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387 | if (ch == '#') |
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388 | st->state = st_tblc; |
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389 | else |
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390 | st->state = st_init; |
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391 | break; |
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392 | |
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393 | case st_tblc: |
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394 | { |
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395 | unsigned int n = (unsigned char)ch - '0'; |
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396 | const char *p; |
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397 | |
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398 | if (n < 10) { |
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399 | st->parms[1] = st->parms[1] * 10 + n; |
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400 | |
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401 | if (!--st->parms[0]) { |
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402 | if (st->parms[1] < console_color_table_size) { |
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403 | /* Set the color table index */ |
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404 | st->cindex = st->parms[1]; |
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405 | |
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406 | /* See if there are any other attributes we care about */ |
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407 | p = console_color_table[st->parms[1]].ansi; |
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408 | if (p) { |
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409 | st->state = st_esc; |
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410 | __ansi_putchar(ti, '['); |
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411 | __ansi_putchar(ti, '0'); |
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412 | __ansi_putchar(ti, ';'); |
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413 | while (*p) |
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414 | __ansi_putchar(ti, *p++); |
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415 | __ansi_putchar(ti, 'm'); |
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416 | } |
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417 | } |
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418 | st->state = st_init; |
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419 | } |
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420 | } else { |
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421 | st->state = st_init; |
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422 | } |
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423 | } |
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424 | break; |
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425 | } |
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426 | |
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427 | /* If we fell off the end of the screen, adjust */ |
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428 | if (xy.x >= cols) { |
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429 | if (st->autowrap) { |
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430 | xy.x = 0; |
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431 | xy.y++; |
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432 | } else { |
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433 | xy.x = cols - 1; |
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434 | } |
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435 | } |
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436 | while (xy.y >= rows) { |
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437 | xy.y--; |
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438 | op->scroll_up(st); |
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439 | } |
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440 | |
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441 | /* Update cursor position */ |
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442 | op->set_cursor(xy.x, xy.y, st->cursor); |
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443 | st->xy = xy; |
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444 | } |
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