src/lib/cmdline_rdline.c

   1 /*-
   2  * Copyright (c) <2010>, Intel Corporation
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  *
  12  * - Redistributions in binary form must reproduce the above copyright
  13  *   notice, this list of conditions and the following disclaimer in
  14  *   the documentation and/or other materials provided with the
  15  *   distribution.
  16  *
  17  * - Neither the name of Intel Corporation nor the names of its
  18  *   contributors may be used to endorse or promote products derived
  19  *   from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  25  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  28  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  30  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  32  * OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
  37  * All rights reserved.
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions are met:
  40  *
  41  *     * Redistributions of source code must retain the above copyright
  42  *       notice, this list of conditions and the following disclaimer.
  43  *     * Redistributions in binary form must reproduce the above copyright
  44  *       notice, this list of conditions and the following disclaimer in the
  45  *       documentation and/or other materials provided with the distribution.
  46  *     * Neither the name of the University of California, Berkeley nor the
  47  *       names of its contributors may be used to endorse or promote products
  48  *       derived from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
  51  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  52  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  53  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
  54  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  55  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  56  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  57  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  59  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  60  */
  61
  62 #include <stdlib.h>
  63 #include <stdio.h>
  64 #include <stdint.h>
  65 #include <string.h>
  66 #include <stdarg.h>
  67 #include <ctype.h>
  68 #include <unistd.h>
  69
  70 #include "cmdline_cirbuf.h"
  71 #include "cmdline_rdline.h"
  72 #include "cmdline_parse.h"
  73
  74 #ifndef NO_RDLINE_HISTORY
  75 static void rdline_remove_old_history_item(struct rdline *rdl);
  76 static void rdline_remove_first_history_item(struct rdline *rdl);
  77 static unsigned int rdline_get_history_size(struct rdline *rdl);
  78 #endif /* !NO_RDLINE_HISTORY */
  79
  80 #ifndef NO_PAGER
  81 static int rdline_pager_next_page(struct rdline *rdl);
  82 static void rdline_asyncpager_reset(struct rdline *rdl);
  83 #endif /* !NO_PAGER */
  84
  85
  86 /* isblank() needs _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE, so use our
  87  * own. */
  88 static int
  89 isblank2(char c)
  90 {
  91         if (c == ' ' ||
  92             c == '\t' )
  93                 return 1;
  94         return 0;
  95 }
  96
  97 void
  98 rdline_init(struct rdline *rdl,
  99             int fd_in, int fd_out,
 100             rdline_validate_t *validate,
 101             rdline_complete_t *complete,
 102             rdline_help_t *help)
 103 {
 104         memset(rdl, 0, sizeof(*rdl));
 105         rdl->fd_in = fd_in;
 106         rdl->fd_out = fd_out;
 107         rdl->validate = validate;
 108         rdl->complete = complete;
 109         rdl->help = help;
 110         rdl->status = RDLINE_INIT;
 111 #ifndef NO_RDLINE_HISTORY
 112         cirbuf_init(&rdl->history, rdl->history_buf, 0, RDLINE_HISTORY_BUF_SIZE);
 113 #endif /* !NO_RDLINE_HISTORY */
 114 }
 115
 116 void
 117 rdline_newline(struct rdline *rdl, const char *prompt)
 118 {
 119         vt100_init(&rdl->vt100);
 120         cirbuf_init(&rdl->left, rdl->left_buf, 0, RDLINE_BUF_SIZE);
 121         cirbuf_init(&rdl->right, rdl->right_buf, 0, RDLINE_BUF_SIZE);
 122
 123         /* if pointer is the same, don't copy it */
 124         if (prompt != rdl->prompt)
 125                 snprintf(rdl->prompt, sizeof(rdl->prompt), "%s", prompt);
 126
 127         rdline_printf(rdl, "%s", rdl->prompt);
 128         rdl->status = RDLINE_RUNNING;
 129
 130 #ifndef NO_RDLINE_HISTORY
 131         rdl->history_cur_line = -1;
 132 #endif /* !NO_RDLINE_HISTORY */
 133 }
 134
 135 void
 136 rdline_stop(struct rdline *rdl)
 137 {
 138         rdl->status = RDLINE_INIT;
 139 }
 140
 141 void
 142 rdline_quit(struct rdline *rdl)
 143 {
 144         rdl->status = RDLINE_EXITED;
 145 }
 146
 147 void
 148 rdline_restart(struct rdline *rdl)
 149 {
 150         rdl->status = RDLINE_RUNNING;
 151 }
 152
 153 const char *
 154 rdline_get_buffer(struct rdline *rdl)
 155 {
 156         unsigned int len_l, len_r;
 157         cirbuf_align_left(&rdl->left);
 158         cirbuf_align_left(&rdl->right);
 159
 160         len_l = CIRBUF_GET_LEN(&rdl->left);
 161         len_r = CIRBUF_GET_LEN(&rdl->right);
 162         memcpy(rdl->left_buf+len_l, rdl->right_buf, len_r);
 163
 164         rdl->left_buf[len_l + len_r] = '\0';
 165         return rdl->left_buf;
 166 }
 167
 168 static void
 169 display_right_buffer(struct rdline *rdl, int force)
 170 {
 171         unsigned int i;
 172         char tmp;
 173
 174         if (!force && CIRBUF_IS_EMPTY(&rdl->right))
 175                 return;
 176
 177         rdline_printf(rdl, vt100_clear_right);
 178         CIRBUF_FOREACH(&rdl->right, i, tmp) {
 179                 rdline_printf(rdl, "%c", tmp);
 180         }
 181         if (!CIRBUF_IS_EMPTY(&rdl->right))
 182                 rdline_printf(rdl, vt100_multi_left,
 183                               CIRBUF_GET_LEN(&rdl->right));
 184 }
 185
 186 void
 187 rdline_redisplay(struct rdline *rdl)
 188 {
 189         unsigned int i;
 190         char tmp;
 191
 192         rdline_printf(rdl, vt100_home);
 193         rdline_printf(rdl, "%s", rdl->prompt);
 194         CIRBUF_FOREACH(&rdl->left, i, tmp) {
 195                 rdline_printf(rdl, "%c", tmp);
 196         }
 197         display_right_buffer(rdl, 1);
 198 }
 199
 200 static int
 201 rdline_parse_char(struct rdline *rdl, char c)
 202 {
 203         unsigned int i;
 204         int cmd;
 205         char tmp;
 206 #ifndef NO_RDLINE_HISTORY
 207         char *buf;
 208 #endif
 209
 210         cmd = vt100_parser(&rdl->vt100, c);
 211         if (cmd == VT100_NOT_COMPLETE)
 212                 return RDLINE_RES_SUCCESS;
 213
 214 #ifndef NO_PAGER
 215         /* display asynchrounous printf if any */
 216         if (rdl->pager_buf != NULL) {
 217                 if (cmd == VT100_STD_CHAR && c == 'q') {
 218                         rdline_asyncpager_reset(rdl);
 219                         if (rdl->pager_cb != NULL) {
 220                                 rdl->pager_cb(rdl, rdl->pager_arg);
 221                                 rdl->pager_cb = NULL;
 222                         }
 223                         if (rdl->pager_buf == NULL)
 224                                 return RDLINE_RES_VALIDATED;
 225                 }
 226
 227                 if (rdline_pager_next_page(rdl) == 0) {
 228                         rdline_asyncpager_reset(rdl);
 229                         if (rdl->pager_cb != NULL) {
 230                                 rdl->pager_cb(rdl, rdl->pager_arg);
 231                                 rdl->pager_cb = NULL;
 232                         }
 233                         if (rdl->pager_buf == NULL)
 234                                 return RDLINE_RES_VALIDATED;
 235                 }
 236                 /* async printf was called in cb() */
 237                 return RDLINE_RES_SUCCESS;
 238         }
 239 #endif
 240
 241         /* process control chars */
 242         if (cmd != VT100_STD_CHAR) {
 243                 switch (cmd) {
 244                 case CMDLINE_KEY_CTRL_B:
 245                 case CMDLINE_KEY_LEFT_ARR:
 246                         if (CIRBUF_IS_EMPTY(&rdl->left))
 247                                 break;
 248                         tmp = cirbuf_get_tail(&rdl->left);
 249                         cirbuf_del_tail(&rdl->left);
 250                         cirbuf_add_head(&rdl->right, tmp);
 251                         rdline_printf(rdl, vt100_left_arr);
 252                         break;
 253
 254                 case CMDLINE_KEY_CTRL_F:
 255                 case CMDLINE_KEY_RIGHT_ARR:
 256                         if (CIRBUF_IS_EMPTY(&rdl->right))
 257                                 break;
 258                         tmp = cirbuf_get_head(&rdl->right);
 259                         cirbuf_del_head(&rdl->right);
 260                         cirbuf_add_tail(&rdl->left, tmp);
 261                         rdline_printf(rdl, vt100_right_arr);
 262                         break;
 263
 264                 case CMDLINE_KEY_WLEFT:
 265                         while (! CIRBUF_IS_EMPTY(&rdl->left) &&
 266                                (tmp = cirbuf_get_tail(&rdl->left)) &&
 267                                isblank2(tmp)) {
 268                                 rdline_printf(rdl, vt100_left_arr);
 269                                 cirbuf_del_tail(&rdl->left);
 270                                 cirbuf_add_head(&rdl->right, tmp);
 271                         }
 272                         while (! CIRBUF_IS_EMPTY(&rdl->left) &&
 273                                (tmp = cirbuf_get_tail(&rdl->left)) &&
 274                                !isblank2(tmp)) {
 275                                 rdline_printf(rdl, vt100_left_arr);
 276                                 cirbuf_del_tail(&rdl->left);
 277                                 cirbuf_add_head(&rdl->right, tmp);
 278                         }
 279                         break;
 280
 281                 case CMDLINE_KEY_WRIGHT:
 282                         while (! CIRBUF_IS_EMPTY(&rdl->right) &&
 283                                (tmp = cirbuf_get_head(&rdl->right)) &&
 284                                isblank2(tmp)) {
 285                                 rdline_printf(rdl, vt100_right_arr);
 286                                 cirbuf_del_head(&rdl->right);
 287                                 cirbuf_add_tail(&rdl->left, tmp);
 288                         }
 289                         while (! CIRBUF_IS_EMPTY(&rdl->right) &&
 290                                (tmp = cirbuf_get_head(&rdl->right)) &&
 291                                !isblank2(tmp)) {
 292                                 rdline_printf(rdl, vt100_right_arr);
 293                                 cirbuf_del_head(&rdl->right);
 294                                 cirbuf_add_tail(&rdl->left, tmp);
 295                         }
 296                         break;
 297
 298                 case CMDLINE_KEY_BKSPACE:
 299                         if(!cirbuf_del_tail_safe(&rdl->left)) {
 300                                 rdline_printf(rdl, vt100_bs);
 301                                 display_right_buffer(rdl, 1);
 302                         }
 303                         break;
 304
 305                 case CMDLINE_KEY_META_BKSPACE:
 306                 case CMDLINE_KEY_CTRL_W:
 307                         while (! CIRBUF_IS_EMPTY(&rdl->left) &&
 308                                isblank2(cirbuf_get_tail(&rdl->left))) {
 309                                 rdline_printf(rdl, vt100_bs);
 310                                 cirbuf_del_tail(&rdl->left);
 311                         }
 312                         while (! CIRBUF_IS_EMPTY(&rdl->left) &&
 313                                !isblank2(cirbuf_get_tail(&rdl->left))) {
 314                                 rdline_printf(rdl, vt100_bs);
 315                                 cirbuf_del_tail(&rdl->left);
 316                         }
 317                         display_right_buffer(rdl, 1);
 318                         break;
 319
 320                 case CMDLINE_KEY_META_D:
 321                         while (! CIRBUF_IS_EMPTY(&rdl->right) &&
 322                                isblank2(cirbuf_get_head(&rdl->right)))
 323                                 cirbuf_del_head(&rdl->right);
 324                         while (! CIRBUF_IS_EMPTY(&rdl->right) &&
 325                                !isblank2(cirbuf_get_head(&rdl->right)))
 326                                 cirbuf_del_head(&rdl->right);
 327                         display_right_buffer(rdl, 1);
 328                         break;
 329
 330                 case CMDLINE_KEY_SUPPR:
 331                 case CMDLINE_KEY_CTRL_D:
 332                         if (cmd == CMDLINE_KEY_CTRL_D &&
 333                             CIRBUF_IS_EMPTY(&rdl->left) &&
 334                             CIRBUF_IS_EMPTY(&rdl->right)) {
 335                                 return RDLINE_RES_EOF;
 336                         }
 337                         if (!cirbuf_del_head_safe(&rdl->right)) {
 338                                 display_right_buffer(rdl, 1);
 339                         }
 340                         break;
 341
 342                 case CMDLINE_KEY_CTRL_A:
 343                         if (CIRBUF_IS_EMPTY(&rdl->left))
 344                                 break;
 345                         rdline_printf(rdl, vt100_multi_left,
 346                                       CIRBUF_GET_LEN(&rdl->left));
 347                         while (! CIRBUF_IS_EMPTY(&rdl->left)) {
 348                                 tmp = cirbuf_get_tail(&rdl->left);
 349                                 cirbuf_del_tail(&rdl->left);
 350                                 cirbuf_add_head(&rdl->right, tmp);
 351                         }
 352                         break;
 353
 354                 case CMDLINE_KEY_CTRL_E:
 355                         if (CIRBUF_IS_EMPTY(&rdl->right))
 356                                 break;
 357                         rdline_printf(rdl, vt100_multi_right,
 358                                       CIRBUF_GET_LEN(&rdl->right));
 359                         while (! CIRBUF_IS_EMPTY(&rdl->right)) {
 360                                 tmp = cirbuf_get_head(&rdl->right);
 361                                 cirbuf_del_head(&rdl->right);
 362                                 cirbuf_add_tail(&rdl->left, tmp);
 363                         }
 364                         break;
 365
 366 #ifndef NO_RDLINE_KILL_BUF
 367                 case CMDLINE_KEY_CTRL_K:
 368                         cirbuf_get_buf_head(&rdl->right, rdl->kill_buf, RDLINE_BUF_SIZE);
 369                         rdl->kill_size = CIRBUF_GET_LEN(&rdl->right);
 370                         cirbuf_del_buf_head(&rdl->right, rdl->kill_size);
 371                         rdline_printf(rdl, vt100_clear_right);
 372                         break;
 373
 374                 case CMDLINE_KEY_CTRL_Y:
 375                         i=0;
 376                         while(CIRBUF_GET_LEN(&rdl->right) + CIRBUF_GET_LEN(&rdl->left) <
 377                               RDLINE_BUF_SIZE &&
 378                               i < rdl->kill_size) {
 379                                 cirbuf_add_tail(&rdl->left, rdl->kill_buf[i]);
 380                                 rdline_printf(rdl, "%c", rdl->kill_buf[i]);
 381                                 i++;
 382                         }
 383                         display_right_buffer(rdl, 0);
 384                         break;
 385 #endif /* !NO_RDLINE_KILL_BUF */
 386
 387                 case CMDLINE_KEY_CTRL_C:
 388                         rdline_printf(rdl, "\r\n");
 389                         rdline_newline(rdl, rdl->prompt);
 390                         break;
 391
 392                 case CMDLINE_KEY_CTRL_L:
 393                         rdline_redisplay(rdl);
 394                         break;
 395
 396                 case CMDLINE_KEY_HELP: {
 397                         if (rdl->help == NULL)
 398                                 break;
 399
 400                         cirbuf_align_left(&rdl->left);
 401                         rdl->left_buf[CIRBUF_GET_LEN(&rdl->left)] = '\0';
 402                         rdline_printf(rdl, "\r\n");
 403 #ifndef NO_PAGER
 404                         rdl->help(rdl, rdl->left_buf, rdline_asyncpager_write, rdl);
 405                         if (rdl->pager_buf != NULL)
 406                                 return RDLINE_RES_SUCCESS;
 407                         else
 408                                 rdline_asyncpager_reset(rdl);
 409 #else
 410                         rdl->help(rdl, rdl->left_buf, rdline_write, rdl);
 411 #endif
 412                         rdline_redisplay(rdl);
 413                         break;
 414                 }
 415
 416                 case CMDLINE_KEY_TAB: {
 417                         char tmp_buf[CMDLINE_MAX_TOKEN_SIZE];
 418                         int ret;
 419                         unsigned int tmp_size;
 420
 421                         if (rdl->complete == NULL)
 422                                 break;
 423
 424                         cirbuf_align_left(&rdl->left);
 425                         rdl->left_buf[CIRBUF_GET_LEN(&rdl->left)] = '\0';
 426
 427                         /* see in parse.h for help on complete() */
 428                         ret = rdl->complete(rdl, rdl->left_buf,
 429                                             tmp_buf, sizeof(tmp_buf));
 430                         /* no completion or error */
 431                         if (ret == CMDLINE_COMPLETE_NONE ||
 432                             ret == CMDLINE_COMPLETE_MANY) {
 433                                 cirbuf_align_left(&rdl->left);
 434                                 rdl->left_buf[CIRBUF_GET_LEN(&rdl->left)] = '\0';
 435                                 rdline_printf(rdl, "\r\n");
 436 #ifndef NO_PAGER
 437                                 rdl->help(rdl, rdl->left_buf, rdline_asyncpager_write,
 438                                           rdl);
 439                                 if (rdl->pager_buf != NULL)
 440                                         return RDLINE_RES_SUCCESS;
 441                                 else
 442                                         rdline_asyncpager_reset(rdl);
 443 #else
 444                                 rdl->help(rdl, rdl->left_buf, rdline_write, rdl);
 445 #endif
 446                                 rdline_redisplay(rdl);
 447                                 break;
 448                         }
 449
 450                         tmp_size = strlen(tmp_buf);
 451                         /* add chars */
 452                         i = 0;
 453                         while(CIRBUF_GET_LEN(&rdl->right) + CIRBUF_GET_LEN(&rdl->left) <
 454                               RDLINE_BUF_SIZE &&
 455                               i < tmp_size) {
 456                                 cirbuf_add_tail(&rdl->left, tmp_buf[i]);
 457                                 rdline_printf(rdl, "%c", tmp_buf[i]);
 458                                 i++;
 459                         }
 460                         display_right_buffer(rdl, 1);
 461                         break;
 462                 }
 463
 464                 case CMDLINE_KEY_RETURN:
 465                 case CMDLINE_KEY_RETURN2:
 466                         cirbuf_align_left(&rdl->left);
 467                         rdl->left_buf[CIRBUF_GET_LEN(&rdl->left)] = '\n';
 468                         rdl->left_buf[CIRBUF_GET_LEN(&rdl->left) + 1] = '\0';
 469                         rdline_printf(rdl, "\r\n");
 470 #ifndef NO_RDLINE_HISTORY
 471                         if (rdl->history_cur_line != -1)
 472                                 rdline_remove_first_history_item(rdl);
 473 #endif
 474
 475                         if (rdl->validate)
 476                                 rdl->validate(rdl, rdl->left_buf, CIRBUF_GET_LEN(&rdl->left)+2);
 477 #ifndef NO_PAGER
 478                         /* user may have stopped rdline */
 479                         if (rdl->status == RDLINE_EXITED) {
 480                                 rdline_asyncpager_reset(rdl);
 481                                 return RDLINE_RES_EXITED;
 482                         }
 483                         if (rdl->pager_buf != NULL)
 484                                 return RDLINE_RES_SUCCESS;
 485                         else
 486                                 rdline_asyncpager_reset(rdl);
 487
 488                         rdl->status = RDLINE_INIT;
 489 #else
 490                         if (rdl->status == RDLINE_EXITED)
 491                                 return RDLINE_RES_EXITED;
 492 #endif
 493                         return RDLINE_RES_VALIDATED;
 494
 495 #ifndef NO_RDLINE_HISTORY
 496                 case CMDLINE_KEY_UP_ARR:
 497                 case CMDLINE_KEY_CTRL_P:
 498                         if (rdl->history_cur_line == 0) {
 499                                 rdline_remove_first_history_item(rdl);
 500                         }
 501                         if (rdl->history_cur_line <= 0) {
 502                                 rdline_add_history(rdl, rdline_get_buffer(rdl));
 503                                 rdl->history_cur_line = 0;
 504                         }
 505
 506                         buf = rdline_get_history_item(rdl, rdl->history_cur_line + 1);
 507                         if (!buf)
 508                                 break;
 509
 510                         rdl->history_cur_line ++;
 511                         vt100_init(&rdl->vt100);
 512                         cirbuf_init(&rdl->left, rdl->left_buf, 0, RDLINE_BUF_SIZE);
 513                         cirbuf_init(&rdl->right, rdl->right_buf, 0, RDLINE_BUF_SIZE);
 514                         cirbuf_add_buf_tail(&rdl->left, buf, strlen(buf));
 515                         rdline_redisplay(rdl);
 516                         break;
 517
 518                 case CMDLINE_KEY_DOWN_ARR:
 519                 case CMDLINE_KEY_CTRL_N:
 520                         if (rdl->history_cur_line - 1 < 0)
 521                                 break;
 522
 523                         rdl->history_cur_line --;
 524                         buf = rdline_get_history_item(rdl, rdl->history_cur_line);
 525                         if (!buf)
 526                                 break;
 527                         vt100_init(&rdl->vt100);
 528                         cirbuf_init(&rdl->left, rdl->left_buf, 0, RDLINE_BUF_SIZE);
 529                         cirbuf_init(&rdl->right, rdl->right_buf, 0, RDLINE_BUF_SIZE);
 530                         cirbuf_add_buf_tail(&rdl->left, buf, strlen(buf));
 531                         rdline_redisplay(rdl);
 532
 533                         break;
 534 #endif /* !NO_RDLINE_HISTORY */
 535
 536                 default:
 537                         break;
 538                 }
 539
 540                 return RDLINE_RES_SUCCESS;
 541         }
 542
 543         if (!isprint((int)c))
 544                 return RDLINE_RES_SUCCESS;
 545
 546         /* standard chars */
 547         if (CIRBUF_GET_LEN(&rdl->left) + CIRBUF_GET_LEN(&rdl->right) >= RDLINE_BUF_SIZE)
 548                 return RDLINE_RES_SUCCESS;
 549
 550         if (cirbuf_add_tail_safe(&rdl->left, c))
 551                 return RDLINE_RES_SUCCESS;
 552
 553         rdline_printf(rdl, "%c", c);
 554         display_right_buffer(rdl, 0);
 555
 556         return RDLINE_RES_SUCCESS;
 557 }
 558
 559 int
 560 rdline_char_in(struct rdline *rdl, char c)
 561 {
 562         int ret, same = 0;
 563         const char *history, *buffer;
 564
 565         if (rdl->status == RDLINE_EXITED)
 566                 return RDLINE_RES_EXITED;
 567         if (rdl->status != RDLINE_RUNNING)
 568                 return RDLINE_RES_NOT_RUNNING;
 569
 570         ret = rdline_parse_char(rdl, c);
 571
 572         /* add line to history */
 573         if (ret == RDLINE_RES_VALIDATED) {
 574                 buffer = rdline_get_buffer(rdl);
 575                 history = rdline_get_history_item(rdl, 0);
 576                 if (history)
 577                         same = !strcmp(buffer, history);
 578
 579                 if (strlen(buffer) >= 1 && same == 0)
 580                         rdline_add_history(rdl, buffer);
 581         }
 582
 583         return ret;
 584 }
 585
 586 int
 587 rdline(struct rdline *rdl, const char *prompt)
 588 {
 589         char c;
 590         int ret = RDLINE_RES_NOT_RUNNING;
 591
 592         rdline_newline(rdl, prompt);
 593         while (1) {
 594                 if (read(rdl->fd_in, &c, 1) < 0)
 595                         break;
 596                 ret = rdline_char_in(rdl, c);
 597                 if (ret != RDLINE_RES_SUCCESS)
 598                         break;
 599         }
 600
 601         return ret;
 602 }
 603
 604 /* HISTORY */
 605
 606 #ifndef NO_RDLINE_HISTORY
 607 static void
 608 rdline_remove_old_history_item(struct rdline * rdl)
 609 {
 610         char tmp;
 611
 612         while (! CIRBUF_IS_EMPTY(&rdl->history) ) {
 613                 tmp = cirbuf_get_head(&rdl->history);
 614                 cirbuf_del_head(&rdl->history);
 615                 if (!tmp)
 616                         break;
 617         }
 618 }
 619
 620 static void
 621 rdline_remove_first_history_item(struct rdline * rdl)
 622 {
 623         char tmp;
 624
 625         if ( CIRBUF_IS_EMPTY(&rdl->history) ) {
 626                 return;
 627         }
 628         else {
 629                 cirbuf_del_tail(&rdl->history);
 630         }
 631
 632         while (! CIRBUF_IS_EMPTY(&rdl->history) ) {
 633                 tmp = cirbuf_get_tail(&rdl->history);
 634                 if (!tmp)
 635                         break;
 636                 cirbuf_del_tail(&rdl->history);
 637         }
 638 }
 639
 640 static unsigned int
 641 rdline_get_history_size(struct rdline * rdl)
 642 {
 643         unsigned int i, tmp, ret=0;
 644
 645         CIRBUF_FOREACH(&rdl->history, i, tmp) {
 646                 if (tmp == 0)
 647                         ret ++;
 648         }
 649
 650         return ret;
 651 }
 652
 653 char *
 654 rdline_get_history_item(struct rdline * rdl, unsigned int idx)
 655 {
 656         unsigned int len, i, tmp;
 657
 658         len = rdline_get_history_size(rdl);
 659         if ( idx >= len ) {
 660                 return NULL;
 661         }
 662
 663         cirbuf_align_left(&rdl->history);
 664
 665         CIRBUF_FOREACH(&rdl->history, i, tmp) {
 666                 if ( idx == len - 1) {
 667                         return rdl->history_buf + i;
 668                 }
 669                 if (tmp == 0)
 670                         len --;
 671         }
 672
 673         return NULL;
 674 }
 675
 676 int
 677 rdline_add_history(struct rdline * rdl, const char * buf)
 678 {
 679         unsigned int len;
 680
 681         len = strlen(buf);
 682         if (len >= RDLINE_HISTORY_BUF_SIZE)
 683                 return -1;
 684
 685         while (len >= CIRBUF_GET_FREELEN(&rdl->history)) {
 686                 rdline_remove_old_history_item(rdl);
 687         }
 688
 689         cirbuf_add_buf_tail(&rdl->history, buf, len);
 690         cirbuf_add_tail(&rdl->history, 0);
 691
 692         return 0;
 693 }
 694
 695 void
 696 rdline_clear_history(struct rdline * rdl)
 697 {
 698         cirbuf_init(&rdl->history, rdl->history_buf, 0, RDLINE_HISTORY_BUF_SIZE);
 699 }
 700
 701 #else /* !NO_RDLINE_HISTORY */
 702
 703 int rdline_add_history(struct rdline * rdl, const char * buf)
 704 {
 705         return -1;
 706 }
 707
 708 void rdline_clear_history(struct rdline * rdl)
 709 {
 710         return;
 711 }
 712
 713 char * rdline_get_history_item(struct rdline * rdl, unsigned int i)
 714 {
 715         return NULL;
 716 }
 717
 718
 719 #endif /* !NO_RDLINE_HISTORY */
 720
 721
 722 ssize_t
 723 rdline_write(const struct rdline *rdl, void *buf, size_t count)
 724 {
 725         return write(rdl->fd_out, buf, count);
 726 }
 727
 728 int
 729 rdline_vprintf(const struct rdline *rdl, const char *fmt, va_list ap)
 730 {
 731         int ret;
 732 #ifndef _GNU_SOURCE
 733         char *buf;
 734 #endif
 735
 736         if (rdl->fd_out < 0)
 737                 return -1;
 738
 739 #ifdef _GNU_SOURCE
 740         ret = vdprintf(rdl->fd_out, fmt, ap);
 741 #else
 742         buf = malloc(BUFSIZ);
 743         if (buf == NULL)
 744                 return -1;
 745
 746         ret = vsnprintf(buf, BUFSIZ, fmt, ap);
 747
 748         if (ret > 0)
 749                 write(rdl->fd_out, buf, (ret >= BUFSIZ) ? BUFSIZ : ret);
 750         free(buf);
 751 #endif
 752
 753         return ret;
 754 }
 755
 756 int
 757 rdline_printf(const struct rdline *rdl, const char *fmt, ...)
 758 {
 759         va_list ap;
 760         int ret;
 761
 762         va_start(ap, fmt);
 763         ret = rdline_vprintf(rdl, fmt, ap);
 764         va_end(ap);
 765
 766         return ret;
 767 }
 768
 769 #ifndef NO_PAGER
 770 /* reset pager state */
 771 void
 772 rdline_asyncpager_reset(struct rdline *rdl)
 773 {
 774         if (rdl->pager_buf) {
 775                 free(rdl->pager_buf);
 776                 rdl->pager_buf = NULL;
 777         }
 778         rdl->pager_lines = 0;
 779         rdl->pager_len = 0;
 780         rdl->pager_off = 0;
 781 }
 782
 783 /* Return the offset of the i-th occurence of char c in string s. If
 784  * there is less than i occurences, return -1 and fill i with the
 785  * count. */
 786 static int
 787 strnchr(const char *s, char c, int *i)
 788 {
 789         int n = 0;
 790         const char *orig = s;
 791
 792         while (*s) {
 793                 if (*s == c)
 794                         n++;
 795                 if (*i == n)
 796                         return s - orig;
 797                 s++;
 798         }
 799         *i = n;
 800         return -1;
 801 }
 802
 803 /* display a page of data from pager, return 0 if all is displayed */
 804 static int
 805 rdline_pager_next_page(struct rdline *rdl)
 806 {
 807         int lines = RDLINE_MAX_LINES;
 808         int displen;
 809         char *s;
 810
 811         s = rdl->pager_buf;
 812         if (s == NULL)
 813                 return 0;
 814
 815         rdline_printf(rdl, vt100_home);
 816         rdline_printf(rdl, vt100_clear_right);
 817
 818         s += rdl->pager_off;
 819
 820         /* we know that s is 0-terminated */
 821         displen = strnchr(s, '\n', &lines);
 822         rdl->pager_lines = lines;
 823
 824         /* we can display all the data */
 825         if (displen == -1) {
 826                 write(rdl->fd_out, s, rdl->pager_len);
 827                 free(rdl->pager_buf);
 828                 rdl->pager_buf = NULL;
 829                 return 0;
 830         }
 831
 832         displen = displen + 1; /* include \n */
 833         write(rdl->fd_out, s, displen);
 834         rdl->pager_off += displen;
 835         rdl->pager_len -= displen;
 836
 837         rdline_printf(rdl, "--- press a key to continue ---");
 838         return -1;
 839 }
 840
 841 /* push data in pager */
 842 ssize_t
 843 rdline_asyncpager_write(struct rdline *rdl, void *buf, size_t len)
 844 {
 845         char *s = buf;
 846
 847         /* display as many lines as we can */
 848         if (rdl->pager_lines < RDLINE_MAX_LINES) {
 849                 int lines = RDLINE_MAX_LINES - rdl->pager_lines;
 850                 int displen;
 851
 852                 /* we know that s is 0-terminated */
 853                 displen = strnchr(s, '\n', &lines);
 854                 rdl->pager_lines += lines;
 855
 856                 /* we can display all the data */
 857                 if (displen == -1) {
 858                         write(rdl->fd_out, s, len);
 859                         return 0;
 860                 }
 861                 displen = displen + 1; /* include \n */
 862                 write(rdl->fd_out, s, displen);
 863                 s += displen;
 864                 len -= displen;
 865         }
 866
 867         if (rdl->pager_buf == NULL) {
 868                 rdline_printf(rdl, "--- press a key to continue ---");
 869         }
 870         rdl->pager_buf = realloc(rdl->pager_buf, rdl->pager_len + len);
 871         if (rdl->pager_buf == NULL) {
 872                 rdline_asyncpager_reset(rdl);
 873                 return -1;
 874         }
 875
 876         memcpy(rdl->pager_buf + rdl->pager_len, s, len);
 877         rdl->pager_len += len;
 878         return 0;
 879 }
 880
 881 /* Print data asynchronously (using pager if needed) */
 882 int
 883 rdline_asyncpager_printf(struct rdline *rdl, const char *fmt, ...)
 884 {
 885         int n;
 886         char *buf;
 887         va_list ap;
 888
 889         if (rdl->fd_out < 0)
 890                 return -1;
 891
 892         buf = malloc(BUFSIZ);
 893         if (buf == NULL)
 894                 return -1;
 895
 896         va_start(ap, fmt);
 897         n = vsnprintf(buf, BUFSIZ, fmt, ap);
 898         va_end(ap);
 899
 900         if (n >= BUFSIZ)
 901                 n = BUFSIZ-1;
 902         if (n > 0)
 903                 rdline_asyncpager_write(rdl, buf, n);
 904         free(buf);
 905         return n;
 906 }
 907
 908 int rdline_asyncpager_set_cb(struct rdline *rdl, rdline_asyncpager_cb_t *cb,
 909                              void *arg)
 910 {
 911         if (rdl->pager_buf == NULL)
 912                 return -1;
 913
 914         rdl->pager_cb = cb;
 915         rdl->pager_arg = arg;
 916         return 0;
 917 }
 918 #endif /* !NO_PAGER */