projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| a1f824e5 KA |
1 | .ds f. intro.2 |
| 2 | .sh 1 Variables | |
| 3 | .pp | |
| 4 | Many variables which are used to describe the terminal environment | |
| 5 | are available to the programmer. They are: | |
| 6 | .TS | |
| 7 | .if \n+(b.=1 .nr d. \n(.c-\n(c.-1 | |
| 8 | .de 35 | |
| 9 | .ps \n(.s | |
| 10 | .vs \n(.vu | |
| 11 | .in \n(.iu | |
| 12 | .if \n(.u .fi | |
| 13 | .if \n(.j .ad | |
| 14 | .if \n(.j=0 .na | |
| 15 | .. | |
| 16 | .nf | |
| 17 | .nr #~ 0 | |
| 18 | .if n .nr #~ 0.6n | |
| 19 | .ds #d .d | |
| 20 | .if \(ts\n(.z\(ts\(ts .ds #d nl | |
| 21 | .fc | |
| 22 | .nr 33 \n(.s | |
| 23 | .rm 80 81 82 | |
| 24 | .nr 34 \n(.lu | |
| 25 | .eo | |
| 26 | .am 82 | |
| 27 | .br | |
| 28 | .di a+ | |
| 29 | .35 | |
| 30 | .ft \n(.f | |
| 31 | .ll 50nn | |
| 32 | .if \n(.l<\n(82 .ll \n(82u | |
| 33 | .in 0 | |
| 34 | .fi | |
| 35 | current version of the screen (terminal screen). | |
| 36 | .br | |
| 37 | .di | |
| 38 | .nr a| \n(dn | |
| 39 | .nr a- \n(dl | |
| 40 | .. | |
| 41 | .ec \ | |
| 42 | .eo | |
| 43 | .am 82 | |
| 44 | .br | |
| 45 | .di b+ | |
| 46 | .35 | |
| 47 | .ft \n(.f | |
| 48 | .ll 50nn | |
| 49 | .if \n(.l<\n(82 .ll \n(82u | |
| 50 | .in 0 | |
| 51 | standard screen. Most updates are usually done here. | |
| 52 | .br | |
| 53 | .di | |
| 54 | .nr b| \n(dn | |
| 55 | .nr b- \n(dl | |
| 56 | .. | |
| 57 | .ec \ | |
| 58 | .eo | |
| 59 | .am 82 | |
| 60 | .br | |
| 61 | .di c+ | |
| 62 | .35 | |
| 63 | .ft \n(.f | |
| 64 | .ll 50nn | |
| 65 | .if \n(.l<\n(82 .ll \n(82u | |
| 66 | .in 0 | |
| 67 | default terminal type if type cannot be determined | |
| 68 | .br | |
| 69 | .di | |
| 70 | .nr c| \n(dn | |
| 71 | .nr c- \n(dl | |
| 72 | .. | |
| 73 | .ec \ | |
| 74 | .eo | |
| 75 | .am 82 | |
| 76 | .br | |
| 77 | .di d+ | |
| 78 | .35 | |
| 79 | .ft \n(.f | |
| 80 | .ll 50nn | |
| 81 | .if \n(.l<\n(82 .ll \n(82u | |
| 82 | .in 0 | |
| 83 | use the terminal specification in \fIDef\*_term\fR as terminal, | |
| 84 | irrelevant of real terminal type | |
| 85 | .br | |
| 86 | .di | |
| 87 | .nr d| \n(dn | |
| 88 | .nr d- \n(dl | |
| 89 | .. | |
| 90 | .ec \ | |
| 91 | .eo | |
| 92 | .am 82 | |
| 93 | .br | |
| 94 | .di e+ | |
| 95 | .35 | |
| 96 | .ft \n(.f | |
| 97 | .ll 50nn | |
| 98 | .if \n(.l<\n(82 .ll \n(82u | |
| 99 | .in 0 | |
| 100 | full name of the current terminal. | |
| 101 | .br | |
| 102 | .di | |
| 103 | .nr e| \n(dn | |
| 104 | .nr e- \n(dl | |
| 105 | .. | |
| 106 | .ec \ | |
| 107 | .eo | |
| 108 | .am 82 | |
| 109 | .br | |
| 110 | .di f+ | |
| 111 | .35 | |
| 112 | .ft \n(.f | |
| 113 | .ll 50nn | |
| 114 | .if \n(.l<\n(82 .ll \n(82u | |
| 115 | .in 0 | |
| 116 | number of lines on the terminal | |
| 117 | .br | |
| 118 | .di | |
| 119 | .nr f| \n(dn | |
| 120 | .nr f- \n(dl | |
| 121 | .. | |
| 122 | .ec \ | |
| 123 | .eo | |
| 124 | .am 82 | |
| 125 | .br | |
| 126 | .di g+ | |
| 127 | .35 | |
| 128 | .ft \n(.f | |
| 129 | .ll 50nn | |
| 130 | .if \n(.l<\n(82 .ll \n(82u | |
| 131 | .in 0 | |
| 132 | number of columns on the terminal | |
| 133 | .br | |
| 134 | .di | |
| 135 | .nr g| \n(dn | |
| 136 | .nr g- \n(dl | |
| 137 | .. | |
| 138 | .ec \ | |
| 139 | .eo | |
| 140 | .am 82 | |
| 141 | .br | |
| 142 | .di h+ | |
| 143 | .35 | |
| 144 | .ft \n(.f | |
| 145 | .ll 50nn | |
| 146 | .if \n(.l<\n(82 .ll \n(82u | |
| 147 | .in 0 | |
| 148 | error flag returned by routines on a fail. | |
| 149 | .br | |
| 150 | .di | |
| 151 | .nr h| \n(dn | |
| 152 | .nr h- \n(dl | |
| 153 | .. | |
| 154 | .ec \ | |
| 155 | .eo | |
| 156 | .am 82 | |
| 157 | .br | |
| 158 | .di i+ | |
| 159 | .35 | |
| 160 | .ft \n(.f | |
| 161 | .ll 50nn | |
| 162 | .if \n(.l<\n(82 .ll \n(82u | |
| 163 | .in 0 | |
| 164 | error flag returned by routines when things go right. | |
| 165 | .br | |
| 166 | .di | |
| 167 | .nr i| \n(dn | |
| 168 | .nr i- \n(dl | |
| 169 | .. | |
| 170 | .ec \ | |
| 171 | .35 | |
| 172 | .nf | |
| 173 | .ll \n(34u | |
| 174 | .nr 80 0 | |
| 175 | .nr 38 \w\ 2type\ 2 | |
| 176 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 177 | .nr 38 \w\ 2WINDOW *\ 2 | |
| 178 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 179 | .nr 38 \w\ 2WINDOW *\ 2 | |
| 180 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 181 | .nr 38 \w\ 2char *\ 2 | |
| 182 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 183 | .nr 38 \w\ 2bool\ 2 | |
| 184 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 185 | .nr 38 \w\ 2char *\ 2 | |
| 186 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 187 | .nr 38 \w\ 2int\ 2 | |
| 188 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 189 | .nr 38 \w\ 2int\ 2 | |
| 190 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 191 | .nr 38 \w\ 2int\ 2 | |
| 192 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 193 | .nr 38 \w\ 2int\ 2 | |
| 194 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 195 | .80 | |
| 196 | .rm 80 | |
| 197 | .nr 38 6mn | |
| 198 | .if \n(80<\n(38 .nr 80 \n(38 | |
| 199 | .nr 81 0 | |
| 200 | .nr 38 \w\ 2name\ 2 | |
| 201 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 202 | .nr 38 \w\ 2curscr\ 2 | |
| 203 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 204 | .nr 38 \w\ 2stdscr\ 2 | |
| 205 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 206 | .nr 38 \w\ 2Def\*_term\ 2 | |
| 207 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 208 | .nr 38 \w\ 2My\*_term\ 2 | |
| 209 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 210 | .nr 38 \w\ 2ttytype\ 2 | |
| 211 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 212 | .nr 38 \w\ 2LINES\ 2 | |
| 213 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 214 | .nr 38 \w\ 2COLS\ 2 | |
| 215 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 216 | .nr 38 \w\ 2ERR\ 2 | |
| 217 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 218 | .nr 38 \w\ 2OK\ 2 | |
| 219 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 220 | .81 | |
| 221 | .rm 81 | |
| 222 | .nr 38 8nn | |
| 223 | .if \n(81<\n(38 .nr 81 \n(38 | |
| 224 | .nr 82 0 | |
| 225 | .nr 38 \w\ 2description\ 2 | |
| 226 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 227 | .82 | |
| 228 | .rm 82 | |
| 229 | .nr 38 \n(a- | |
| 230 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 231 | .nr 38 \n(b- | |
| 232 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 233 | .nr 38 \n(c- | |
| 234 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 235 | .nr 38 \n(d- | |
| 236 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 237 | .nr 38 \n(e- | |
| 238 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 239 | .nr 38 \n(f- | |
| 240 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 241 | .nr 38 \n(g- | |
| 242 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 243 | .nr 38 \n(h- | |
| 244 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 245 | .nr 38 \n(i- | |
| 246 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 247 | .nr 38 50nn | |
| 248 | .if \n(82<\n(38 .nr 82 \n(38 | |
| 249 | .35 | |
| 250 | .nf | |
| 251 | .ll \n(34u | |
| 252 | .nr 38 0+\n(80+\n(81+\n(82 | |
| 253 | .nr 38 \n(.l-\n(38 | |
| 254 | .nr 38 \n(38/6 | |
| 255 | .if \n(38<0 .nr 38 0 | |
| 256 | .nr 79 0 | |
| 257 | .nr 40 \n(79+(0*\n(38) | |
| 258 | .nr 80 +\n(40 | |
| 259 | .nr 41 \n(80+(3*\n(38) | |
| 260 | .nr 81 +\n(41 | |
| 261 | .nr 42 \n(81+(3*\n(38) | |
| 262 | .nr 82 +\n(42 | |
| 263 | .nr TW \n(82 | |
| 264 | .if t .if (\n(TW+\n(.o)>7.65i .tm Table at line 39 file intro.2 is too wide - \n(TW units | |
| 265 | .fc \ 2 \ 3 | |
| 266 | .nr #T 0-1 | |
| 267 | .nr #a 0-1 | |
| 268 | .eo | |
| 269 | .de T# | |
| 270 | .ds #d .d | |
| 271 | .if \(ts\n(.z\(ts\(ts .ds #d nl | |
| 272 | .mk ## | |
| 273 | .nr ## -1v | |
| 274 | .ls 1 | |
| 275 | .ls | |
| 276 | .. | |
| 277 | .ec | |
| 278 | .ta \n(80u \n(81u \n(82u | |
| 279 | .nr 31 \n(.f | |
| 280 | .nr 35 1m | |
| 281 | \&\h'|\n(40u'\ 2type\ 3\ 2\h'|\n(41u'\ 2name\ 3\ 2\h'|\n(42u'\ 2description\ 3\ 2 | |
| 282 | .nr 36 \n(.v | |
| 283 | .vs \n(.vu-\n(.sp | |
| 284 | \h'|0'\s\n(33\l'|\n(TWu\(ul'\s0 | |
| 285 | .vs \n(36u | |
| 286 | .ne \n(a|u+\n(.Vu | |
| 287 | .if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v) | |
| 288 | .ta \n(80u \n(81u \n(82u | |
| 289 | .nr 31 \n(.f | |
| 290 | .nr 35 1m | |
| 291 | \&\h'|\n(40u'\ 2WINDOW *\ 3\ 2\h'|\n(41u'\ 2curscr\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 292 | .mk ## | |
| 293 | .nr 31 \n(## | |
| 294 | .sp |\n(##u-1v | |
| 295 | .nr 37 \n(42u | |
| 296 | .in +\n(37u | |
| 297 | .a+ | |
| 298 | .in -\n(37u | |
| 299 | .mk 32 | |
| 300 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 301 | .sp |\n(31u | |
| 302 | .ne \n(b|u+\n(.Vu | |
| 303 | .if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v) | |
| 304 | .ta \n(80u \n(81u \n(82u | |
| 305 | .nr 31 \n(.f | |
| 306 | .nr 35 1m | |
| 307 | \&\h'|\n(40u'\ 2WINDOW *\ 3\ 2\h'|\n(41u'\ 2stdscr\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 308 | .mk ## | |
| 309 | .nr 31 \n(## | |
| 310 | .sp |\n(##u-1v | |
| 311 | .nr 37 \n(42u | |
| 312 | .in +\n(37u | |
| 313 | .b+ | |
| 314 | .in -\n(37u | |
| 315 | .mk 32 | |
| 316 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 317 | .sp |\n(31u | |
| 318 | .ne \n(c|u+\n(.Vu | |
| 319 | .if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v) | |
| 320 | .ta \n(80u \n(81u \n(82u | |
| 321 | .nr 31 \n(.f | |
| 322 | .nr 35 1m | |
| 323 | \&\h'|\n(40u'\ 2char *\ 3\ 2\h'|\n(41u'\ 2Def\*_term\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 324 | .mk ## | |
| 325 | .nr 31 \n(## | |
| 326 | .sp |\n(##u-1v | |
| 327 | .nr 37 \n(42u | |
| 328 | .in +\n(37u | |
| 329 | .c+ | |
| 330 | .in -\n(37u | |
| 331 | .mk 32 | |
| 332 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 333 | .sp |\n(31u | |
| 334 | .ne \n(d|u+\n(.Vu | |
| 335 | .if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v) | |
| 336 | .ta \n(80u \n(81u \n(82u | |
| 337 | .nr 31 \n(.f | |
| 338 | .nr 35 1m | |
| 339 | \&\h'|\n(40u'\ 2bool\ 3\ 2\h'|\n(41u'\ 2My\*_term\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 340 | .mk ## | |
| 341 | .nr 31 \n(## | |
| 342 | .sp |\n(##u-1v | |
| 343 | .nr 37 \n(42u | |
| 344 | .in +\n(37u | |
| 345 | .d+ | |
| 346 | .in -\n(37u | |
| 347 | .mk 32 | |
| 348 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 349 | .sp |\n(31u | |
| 350 | .ne \n(e|u+\n(.Vu | |
| 351 | .if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v) | |
| 352 | .ta \n(80u \n(81u \n(82u | |
| 353 | .nr 31 \n(.f | |
| 354 | .nr 35 1m | |
| 355 | \&\h'|\n(40u'\ 2char *\ 3\ 2\h'|\n(41u'\ 2ttytype\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 356 | .mk ## | |
| 357 | .nr 31 \n(## | |
| 358 | .sp |\n(##u-1v | |
| 359 | .nr 37 \n(42u | |
| 360 | .in +\n(37u | |
| 361 | .e+ | |
| 362 | .in -\n(37u | |
| 363 | .mk 32 | |
| 364 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 365 | .sp |\n(31u | |
| 366 | .ne \n(f|u+\n(.Vu | |
| 367 | .if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v) | |
| 368 | .ta \n(80u \n(81u \n(82u | |
| 369 | .nr 31 \n(.f | |
| 370 | .nr 35 1m | |
| 371 | \&\h'|\n(40u'\ 2int\ 3\ 2\h'|\n(41u'\ 2LINES\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 372 | .mk ## | |
| 373 | .nr 31 \n(## | |
| 374 | .sp |\n(##u-1v | |
| 375 | .nr 37 \n(42u | |
| 376 | .in +\n(37u | |
| 377 | .f+ | |
| 378 | .in -\n(37u | |
| 379 | .mk 32 | |
| 380 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 381 | .sp |\n(31u | |
| 382 | .ne \n(g|u+\n(.Vu | |
| 383 | .if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v) | |
| 384 | .ta \n(80u \n(81u \n(82u | |
| 385 | .nr 31 \n(.f | |
| 386 | .nr 35 1m | |
| 387 | \&\h'|\n(40u'\ 2int\ 3\ 2\h'|\n(41u'\ 2COLS\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 388 | .mk ## | |
| 389 | .nr 31 \n(## | |
| 390 | .sp |\n(##u-1v | |
| 391 | .nr 37 \n(42u | |
| 392 | .in +\n(37u | |
| 393 | .g+ | |
| 394 | .in -\n(37u | |
| 395 | .mk 32 | |
| 396 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 397 | .sp |\n(31u | |
| 398 | .ne \n(h|u+\n(.Vu | |
| 399 | .if (\n(h|+\n(#^-1v)>\n(#- .nr #- +(\n(h|+\n(#^-\n(#--1v) | |
| 400 | .ta \n(80u \n(81u \n(82u | |
| 401 | .nr 31 \n(.f | |
| 402 | .nr 35 1m | |
| 403 | \&\h'|\n(40u'\ 2int\ 3\ 2\h'|\n(41u'\ 2ERR\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 404 | .mk ## | |
| 405 | .nr 31 \n(## | |
| 406 | .sp |\n(##u-1v | |
| 407 | .nr 37 \n(42u | |
| 408 | .in +\n(37u | |
| 409 | .h+ | |
| 410 | .in -\n(37u | |
| 411 | .mk 32 | |
| 412 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 413 | .sp |\n(31u | |
| 414 | .ne \n(i|u+\n(.Vu | |
| 415 | .if (\n(i|+\n(#^-1v)>\n(#- .nr #- +(\n(i|+\n(#^-\n(#--1v) | |
| 416 | .ta \n(80u \n(81u \n(82u | |
| 417 | .nr 31 \n(.f | |
| 418 | .nr 35 1m | |
| 419 | \&\h'|\n(40u'\ 2int\ 3\ 2\h'|\n(41u'\ 2OK\ 3\ 2\h'|\n(42u'\ 2\ 3\ 2 | |
| 420 | .mk ## | |
| 421 | .nr 31 \n(## | |
| 422 | .sp |\n(##u-1v | |
| 423 | .nr 37 \n(42u | |
| 424 | .in +\n(37u | |
| 425 | .i+ | |
| 426 | .in -\n(37u | |
| 427 | .mk 32 | |
| 428 | .if \n(32>\n(31 .nr 31 \n(32 | |
| 429 | .sp |\n(31u | |
| 430 | .fc | |
| 431 | .nr T. 1 | |
| 432 | .T# 1 | |
| 433 | .35 | |
| 434 | .rm a+ | |
| 435 | .rm b+ | |
| 436 | .rm c+ | |
| 437 | .rm d+ | |
| 438 | .rm e+ | |
| 439 | .rm f+ | |
| 440 | .rm g+ | |
| 441 | .rm h+ | |
| 442 | .rm i+ | |
| 443 | .TE | |
| 444 | .if \n-(b.=0 .nr c. \n(.c-\n(d.-34 | |
| 445 | .pp | |
| 446 | There are also several | |
| 447 | .q #define | |
| 448 | constants and types | |
| 449 | which are of general usefulness: | |
| 450 | .sp | |
| 451 | .ev 1 | |
| 452 | .ta 11n | |
| 453 | .(b L | |
| 454 | .nf | |
| 455 | reg storage class ``register'' (e.g., \fIreg int i;\fR\|) | |
| 456 | bool boolean type, actually a ``char'' (e.g., \fIbool doneit;\fR\|) | |
| 457 | TRUE boolean ``true'' flag (1). | |
| 458 | FALSE boolean ``false'' flag (0). | |
| 459 | .fi | |
| 460 | .ev | |
| 461 | .)b | |
| 462 | .lp |