readline.c (15160B)
1 /* 2 * QEMU readline utility 3 * 4 * Copyright (c) 2003-2004 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qemu/readline.h" 27 #include "qemu/ctype.h" 28 #include "qemu/cutils.h" 29 30 #define IS_NORM 0 31 #define IS_ESC 1 32 #define IS_CSI 2 33 #define IS_SS3 3 34 35 void readline_show_prompt(ReadLineState *rs) 36 { 37 rs->printf_func(rs->opaque, "%s", rs->prompt); 38 rs->flush_func(rs->opaque); 39 rs->last_cmd_buf_index = 0; 40 rs->last_cmd_buf_size = 0; 41 rs->esc_state = IS_NORM; 42 } 43 44 /* update the displayed command line */ 45 static void readline_update(ReadLineState *rs) 46 { 47 int i, delta, len; 48 49 if (rs->cmd_buf_size != rs->last_cmd_buf_size || 50 memcmp(rs->cmd_buf, rs->last_cmd_buf, rs->cmd_buf_size) != 0) { 51 for (i = 0; i < rs->last_cmd_buf_index; i++) { 52 rs->printf_func(rs->opaque, "\033[D"); 53 } 54 rs->cmd_buf[rs->cmd_buf_size] = '\0'; 55 if (rs->read_password) { 56 len = strlen(rs->cmd_buf); 57 for (i = 0; i < len; i++) { 58 rs->printf_func(rs->opaque, "*"); 59 } 60 } else { 61 rs->printf_func(rs->opaque, "%s", rs->cmd_buf); 62 } 63 rs->printf_func(rs->opaque, "\033[K"); 64 memcpy(rs->last_cmd_buf, rs->cmd_buf, rs->cmd_buf_size); 65 rs->last_cmd_buf_size = rs->cmd_buf_size; 66 rs->last_cmd_buf_index = rs->cmd_buf_size; 67 } 68 if (rs->cmd_buf_index != rs->last_cmd_buf_index) { 69 delta = rs->cmd_buf_index - rs->last_cmd_buf_index; 70 if (delta > 0) { 71 for (i = 0; i < delta; i++) { 72 rs->printf_func(rs->opaque, "\033[C"); 73 } 74 } else { 75 delta = -delta; 76 for (i = 0; i < delta; i++) { 77 rs->printf_func(rs->opaque, "\033[D"); 78 } 79 } 80 rs->last_cmd_buf_index = rs->cmd_buf_index; 81 } 82 rs->flush_func(rs->opaque); 83 } 84 85 static void readline_insert_char(ReadLineState *rs, int ch) 86 { 87 if (rs->cmd_buf_index < READLINE_CMD_BUF_SIZE) { 88 memmove(rs->cmd_buf + rs->cmd_buf_index + 1, 89 rs->cmd_buf + rs->cmd_buf_index, 90 rs->cmd_buf_size - rs->cmd_buf_index); 91 rs->cmd_buf[rs->cmd_buf_index] = ch; 92 rs->cmd_buf_size++; 93 rs->cmd_buf_index++; 94 } 95 } 96 97 static void readline_backward_char(ReadLineState *rs) 98 { 99 if (rs->cmd_buf_index > 0) { 100 rs->cmd_buf_index--; 101 } 102 } 103 104 static void readline_forward_char(ReadLineState *rs) 105 { 106 if (rs->cmd_buf_index < rs->cmd_buf_size) { 107 rs->cmd_buf_index++; 108 } 109 } 110 111 static void readline_delete_char(ReadLineState *rs) 112 { 113 if (rs->cmd_buf_index < rs->cmd_buf_size) { 114 memmove(rs->cmd_buf + rs->cmd_buf_index, 115 rs->cmd_buf + rs->cmd_buf_index + 1, 116 rs->cmd_buf_size - rs->cmd_buf_index - 1); 117 rs->cmd_buf_size--; 118 } 119 } 120 121 static void readline_backspace(ReadLineState *rs) 122 { 123 if (rs->cmd_buf_index > 0) { 124 readline_backward_char(rs); 125 readline_delete_char(rs); 126 } 127 } 128 129 static void readline_backword(ReadLineState *rs) 130 { 131 int start; 132 133 if (rs->cmd_buf_index == 0 || rs->cmd_buf_index > rs->cmd_buf_size) { 134 return; 135 } 136 137 start = rs->cmd_buf_index - 1; 138 139 /* find first word (backwards) */ 140 while (start > 0) { 141 if (!qemu_isspace(rs->cmd_buf[start])) { 142 break; 143 } 144 145 --start; 146 } 147 148 /* find first space (backwards) */ 149 while (start > 0) { 150 if (qemu_isspace(rs->cmd_buf[start])) { 151 ++start; 152 break; 153 } 154 155 --start; 156 } 157 158 /* remove word */ 159 if (start < rs->cmd_buf_index) { 160 memmove(rs->cmd_buf + start, 161 rs->cmd_buf + rs->cmd_buf_index, 162 rs->cmd_buf_size - rs->cmd_buf_index); 163 rs->cmd_buf_size -= rs->cmd_buf_index - start; 164 rs->cmd_buf_index = start; 165 } 166 } 167 168 static void readline_bol(ReadLineState *rs) 169 { 170 rs->cmd_buf_index = 0; 171 } 172 173 static void readline_eol(ReadLineState *rs) 174 { 175 rs->cmd_buf_index = rs->cmd_buf_size; 176 } 177 178 static void readline_up_char(ReadLineState *rs) 179 { 180 int idx; 181 182 if (rs->hist_entry == 0) { 183 return; 184 } 185 if (rs->hist_entry == -1) { 186 /* Find latest entry */ 187 for (idx = 0; idx < READLINE_MAX_CMDS; idx++) { 188 if (rs->history[idx] == NULL) { 189 break; 190 } 191 } 192 rs->hist_entry = idx; 193 } 194 rs->hist_entry--; 195 if (rs->hist_entry >= 0) { 196 pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf), 197 rs->history[rs->hist_entry]); 198 rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf); 199 } 200 } 201 202 static void readline_down_char(ReadLineState *rs) 203 { 204 if (rs->hist_entry == -1) { 205 return; 206 } 207 if (rs->hist_entry < READLINE_MAX_CMDS - 1 && 208 rs->history[++rs->hist_entry] != NULL) { 209 pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf), 210 rs->history[rs->hist_entry]); 211 } else { 212 rs->cmd_buf[0] = 0; 213 rs->hist_entry = -1; 214 } 215 rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf); 216 } 217 218 static void readline_hist_add(ReadLineState *rs, const char *cmdline) 219 { 220 char *hist_entry, *new_entry; 221 int idx; 222 223 if (cmdline[0] == '\0') { 224 return; 225 } 226 new_entry = NULL; 227 if (rs->hist_entry != -1) { 228 /* We were editing an existing history entry: replace it */ 229 hist_entry = rs->history[rs->hist_entry]; 230 idx = rs->hist_entry; 231 if (strcmp(hist_entry, cmdline) == 0) { 232 goto same_entry; 233 } 234 } 235 /* Search cmdline in history buffers */ 236 for (idx = 0; idx < READLINE_MAX_CMDS; idx++) { 237 hist_entry = rs->history[idx]; 238 if (hist_entry == NULL) { 239 break; 240 } 241 if (strcmp(hist_entry, cmdline) == 0) { 242 same_entry: 243 if (idx == READLINE_MAX_CMDS - 1) { 244 return; 245 } 246 new_entry = hist_entry; 247 /* Put this entry at the end of history */ 248 memmove(&rs->history[idx], &rs->history[idx + 1], 249 (READLINE_MAX_CMDS - (idx + 1)) * sizeof(char *)); 250 rs->history[READLINE_MAX_CMDS - 1] = NULL; 251 for (; idx < READLINE_MAX_CMDS; idx++) { 252 if (rs->history[idx] == NULL) { 253 break; 254 } 255 } 256 break; 257 } 258 } 259 if (idx == READLINE_MAX_CMDS) { 260 /* Need to get one free slot */ 261 g_free(rs->history[0]); 262 memmove(rs->history, &rs->history[1], 263 (READLINE_MAX_CMDS - 1) * sizeof(char *)); 264 rs->history[READLINE_MAX_CMDS - 1] = NULL; 265 idx = READLINE_MAX_CMDS - 1; 266 } 267 if (new_entry == NULL) { 268 new_entry = g_strdup(cmdline); 269 } 270 rs->history[idx] = new_entry; 271 rs->hist_entry = -1; 272 } 273 274 /* completion support */ 275 276 void readline_add_completion(ReadLineState *rs, const char *str) 277 { 278 if (rs->nb_completions < READLINE_MAX_COMPLETIONS) { 279 int i; 280 for (i = 0; i < rs->nb_completions; i++) { 281 if (!strcmp(rs->completions[i], str)) { 282 return; 283 } 284 } 285 rs->completions[rs->nb_completions++] = g_strdup(str); 286 } 287 } 288 289 void readline_set_completion_index(ReadLineState *rs, int index) 290 { 291 rs->completion_index = index; 292 } 293 294 static int completion_comp(const void *a, const void *b) 295 { 296 return strcmp(*(const char **) a, *(const char **) b); 297 } 298 299 static void readline_completion(ReadLineState *rs) 300 { 301 int len, i, j, max_width, nb_cols, max_prefix; 302 char *cmdline; 303 304 rs->nb_completions = 0; 305 306 cmdline = g_strndup(rs->cmd_buf, rs->cmd_buf_index); 307 rs->completion_finder(rs->opaque, cmdline); 308 g_free(cmdline); 309 310 /* no completion found */ 311 if (rs->nb_completions <= 0) { 312 return; 313 } 314 if (rs->nb_completions == 1) { 315 len = strlen(rs->completions[0]); 316 for (i = rs->completion_index; i < len; i++) { 317 readline_insert_char(rs, rs->completions[0][i]); 318 } 319 /* extra space for next argument. XXX: make it more generic */ 320 if (len > 0 && rs->completions[0][len - 1] != '/') { 321 readline_insert_char(rs, ' '); 322 } 323 } else { 324 qsort(rs->completions, rs->nb_completions, sizeof(char *), 325 completion_comp); 326 rs->printf_func(rs->opaque, "\n"); 327 max_width = 0; 328 max_prefix = 0; 329 for (i = 0; i < rs->nb_completions; i++) { 330 len = strlen(rs->completions[i]); 331 if (i == 0) { 332 max_prefix = len; 333 } else { 334 if (len < max_prefix) { 335 max_prefix = len; 336 } 337 for (j = 0; j < max_prefix; j++) { 338 if (rs->completions[i][j] != rs->completions[0][j]) { 339 max_prefix = j; 340 } 341 } 342 } 343 if (len > max_width) { 344 max_width = len; 345 } 346 } 347 if (max_prefix > 0) 348 for (i = rs->completion_index; i < max_prefix; i++) { 349 readline_insert_char(rs, rs->completions[0][i]); 350 } 351 max_width += 2; 352 if (max_width < 10) { 353 max_width = 10; 354 } else if (max_width > 80) { 355 max_width = 80; 356 } 357 nb_cols = 80 / max_width; 358 j = 0; 359 for (i = 0; i < rs->nb_completions; i++) { 360 rs->printf_func(rs->opaque, "%-*s", max_width, rs->completions[i]); 361 if (++j == nb_cols || i == (rs->nb_completions - 1)) { 362 rs->printf_func(rs->opaque, "\n"); 363 j = 0; 364 } 365 } 366 readline_show_prompt(rs); 367 } 368 for (i = 0; i < rs->nb_completions; i++) { 369 g_free(rs->completions[i]); 370 } 371 } 372 373 static void readline_clear_screen(ReadLineState *rs) 374 { 375 rs->printf_func(rs->opaque, "\033[2J\033[1;1H"); 376 readline_show_prompt(rs); 377 } 378 379 /* return true if command handled */ 380 void readline_handle_byte(ReadLineState *rs, int ch) 381 { 382 switch (rs->esc_state) { 383 case IS_NORM: 384 switch (ch) { 385 case 1: 386 readline_bol(rs); 387 break; 388 case 4: 389 readline_delete_char(rs); 390 break; 391 case 5: 392 readline_eol(rs); 393 break; 394 case 9: 395 readline_completion(rs); 396 break; 397 case 12: 398 readline_clear_screen(rs); 399 break; 400 case 10: 401 case 13: 402 rs->cmd_buf[rs->cmd_buf_size] = '\0'; 403 if (!rs->read_password) { 404 readline_hist_add(rs, rs->cmd_buf); 405 } 406 rs->printf_func(rs->opaque, "\n"); 407 rs->cmd_buf_index = 0; 408 rs->cmd_buf_size = 0; 409 rs->last_cmd_buf_index = 0; 410 rs->last_cmd_buf_size = 0; 411 rs->readline_func(rs->opaque, rs->cmd_buf, rs->readline_opaque); 412 break; 413 case 23: 414 /* ^W */ 415 readline_backword(rs); 416 break; 417 case 27: 418 rs->esc_state = IS_ESC; 419 break; 420 case 127: 421 case 8: 422 readline_backspace(rs); 423 break; 424 case 155: 425 rs->esc_state = IS_CSI; 426 break; 427 default: 428 if (ch >= 32) { 429 readline_insert_char(rs, ch); 430 } 431 break; 432 } 433 break; 434 case IS_ESC: 435 if (ch == '[') { 436 rs->esc_state = IS_CSI; 437 rs->esc_param = 0; 438 } else if (ch == 'O') { 439 rs->esc_state = IS_SS3; 440 rs->esc_param = 0; 441 } else { 442 rs->esc_state = IS_NORM; 443 } 444 break; 445 case IS_CSI: 446 switch (ch) { 447 case 'A': 448 case 'F': 449 readline_up_char(rs); 450 break; 451 case 'B': 452 case 'E': 453 readline_down_char(rs); 454 break; 455 case 'D': 456 readline_backward_char(rs); 457 break; 458 case 'C': 459 readline_forward_char(rs); 460 break; 461 case '0' ... '9': 462 rs->esc_param = rs->esc_param * 10 + (ch - '0'); 463 goto the_end; 464 case '~': 465 switch (rs->esc_param) { 466 case 1: 467 readline_bol(rs); 468 break; 469 case 3: 470 readline_delete_char(rs); 471 break; 472 case 4: 473 readline_eol(rs); 474 break; 475 } 476 break; 477 default: 478 break; 479 } 480 rs->esc_state = IS_NORM; 481 the_end: 482 break; 483 case IS_SS3: 484 switch (ch) { 485 case 'F': 486 readline_eol(rs); 487 break; 488 case 'H': 489 readline_bol(rs); 490 break; 491 } 492 rs->esc_state = IS_NORM; 493 break; 494 } 495 readline_update(rs); 496 } 497 498 void readline_start(ReadLineState *rs, const char *prompt, int read_password, 499 ReadLineFunc *readline_func, void *opaque) 500 { 501 pstrcpy(rs->prompt, sizeof(rs->prompt), prompt); 502 rs->readline_func = readline_func; 503 rs->readline_opaque = opaque; 504 rs->read_password = read_password; 505 readline_restart(rs); 506 } 507 508 void readline_restart(ReadLineState *rs) 509 { 510 rs->cmd_buf_index = 0; 511 rs->cmd_buf_size = 0; 512 } 513 514 const char *readline_get_history(ReadLineState *rs, unsigned int index) 515 { 516 if (index >= READLINE_MAX_CMDS) { 517 return NULL; 518 } 519 return rs->history[index]; 520 } 521 522 void readline_free(ReadLineState *rs) 523 { 524 int i; 525 526 if (!rs) { 527 return; 528 } 529 for (i = 0; i < READLINE_MAX_CMDS; i++) { 530 g_free(rs->history[i]); 531 } 532 g_free(rs); 533 } 534 535 ReadLineState *readline_init(ReadLinePrintfFunc *printf_func, 536 ReadLineFlushFunc *flush_func, 537 void *opaque, 538 ReadLineCompletionFunc *completion_finder) 539 { 540 ReadLineState *rs = g_new0(ReadLineState, 1); 541 542 rs->hist_entry = -1; 543 rs->opaque = opaque; 544 rs->printf_func = printf_func; 545 rs->flush_func = flush_func; 546 rs->completion_finder = completion_finder; 547 548 return rs; 549 }