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
  69 #include "cmdline_cirbuf.h"
  70 #include "cmdline_rdline.h"
  71
  72 static void rdline_puts(struct rdline *rdl, const char *buf);
  73 static void rdline_miniprintf(struct rdline *rdl,
  74                               const char *buf, unsigned int val);
  75
  76 #ifndef NO_RDLINE_HISTORY
  77 static void rdline_remove_old_history_item(struct rdline *rdl);
  78 static void rdline_remove_first_history_item(struct rdline *rdl);
  79 static unsigned int rdline_get_history_size(struct rdline *rdl);
  80 #endif /* !NO_RDLINE_HISTORY */
  81
  82
  83 /* isblank() needs _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE, so use our
  84  * own. */
  85 static int
  86 isblank2(char c)
  87 {
  88         if (c == ' ' ||
  89             c == '\t' )
  90                 return 1;
  91         return 0;
  92 }
  93
  94 void
  95 rdline_init(struct rdline *rdl,
  96                  rdline_write_char_t *write_char,
  97                  rdline_validate_t *validate,
  98                  rdline_complete_t *complete)
  99 {
 100         memset(rdl, 0, sizeof(*rdl));
 101         rdl->validate = validate;
 102         rdl->complete = complete;
 103         rdl->write_char = write_char;
 104         rdl->status = RDLINE_INIT;
 105 #ifndef NO_RDLINE_HISTORY
 106         cirbuf_init(&rdl->history, rdl->history_buf, 0, RDLINE_HISTORY_BUF_SIZE);
 107 #endif /* !NO_RDLINE_HISTORY */
 108 }
 109
 110 void
 111 rdline_newline(struct rdline *rdl, const char *prompt)
 112 {
 113         unsigned int i;
 114
 115         vt100_init(&rdl->vt100);
 116         cirbuf_init(&rdl->left, rdl->left_buf, 0, RDLINE_BUF_SIZE);
 117         cirbuf_init(&rdl->right, rdl->right_buf, 0, RDLINE_BUF_SIZE);
 118
 119         if (prompt != rdl->prompt)
 120                 memcpy(rdl->prompt, prompt, sizeof(rdl->prompt)-1);
 121         rdl->prompt_size = strlen(prompt);
 122
 123         for (i=0 ; i<rdl->prompt_size ; i++)
 124                 rdl->write_char(rdl, rdl->prompt[i]);
 125         rdl->status = RDLINE_RUNNING;
 126
 127 #ifndef NO_RDLINE_HISTORY
 128         rdl->history_cur_line = -1;
 129 #endif /* !NO_RDLINE_HISTORY */
 130 }
 131
 132 void
 133 rdline_stop(struct rdline *rdl)
 134 {
 135         rdl->status = RDLINE_INIT;
 136 }
 137
 138 void
 139 rdline_restart(struct rdline *rdl)
 140 {
 141         rdl->status = RDLINE_RUNNING;
 142 }
 143
 144 const char *
 145 rdline_get_buffer(struct rdline *rdl)
 146 {
 147         unsigned int len_l, len_r;
 148         cirbuf_align_left(&rdl->left);
 149         cirbuf_align_left(&rdl->right);
 150
 151         len_l = CIRBUF_GET_LEN(&rdl->left);
 152         len_r = CIRBUF_GET_LEN(&rdl->right);
 153         memcpy(rdl->left_buf+len_l, rdl->right_buf, len_r);
 154
 155         rdl->left_buf[len_l + len_r] = '\n';
 156         rdl->left_buf[len_l + len_r + 1] = '\0';
 157         return rdl->left_buf;
 158 }
 159
 160 static void
 161 display_right_buffer(struct rdline *rdl)
 162 {
 163         unsigned int i;
 164         char tmp;
 165
 166         rdline_puts(rdl, vt100_clear_right);
 167         if (!CIRBUF_IS_EMPTY(&rdl->right)) {
 168                 CIRBUF_FOREACH(&rdl->right, i, tmp) {
 169                         rdl->write_char(rdl, tmp);
 170                 }
 171                 rdline_miniprintf(rdl, vt100_multi_left,
 172                                   CIRBUF_GET_LEN(&rdl->right));
 173         }
 174 }
 175
 176 void
 177 rdline_redisplay(struct rdline *rdl)
 178 {
 179         unsigned int i;
 180         char tmp;
 181
 182         rdline_puts(rdl, vt100_home);
 183         for (i=0 ; i<rdl->prompt_size ; i++)
 184                 rdl->write_char(rdl, rdl->prompt[i]);
 185         CIRBUF_FOREACH(&rdl->left, i, tmp) {
 186                 rdl->write_char(rdl, tmp);
 187         }
 188         display_right_buffer(rdl);
 189 }
 190
 191 int
 192 rdline_char_in(struct rdline *rdl, char c)
 193 {
 194         unsigned int i;
 195         int cmd;
 196         char tmp;
 197 #ifndef NO_RDLINE_HISTORY
 198         char *buf;
 199 #endif
 200
 201         if (rdl->status != RDLINE_RUNNING)
 202                 return RDLINE_RES_NOT_RUNNING;
 203
 204         cmd = vt100_parser(&rdl->vt100, c);
 205         if (cmd == -2)
 206                 return RDLINE_RES_SUCCESS;
 207
 208         if (cmd >= 0) {
 209                 switch (cmd) {
 210                 case CMDLINE_KEY_CTRL_B:
 211                 case CMDLINE_KEY_LEFT_ARR:
 212                         if (CIRBUF_IS_EMPTY(&rdl->left))
 213                                 break;
 214                         tmp = cirbuf_get_tail(&rdl->left);
 215                         cirbuf_del_tail(&rdl->left);
 216                         cirbuf_add_head(&rdl->right, tmp);
 217                         rdline_puts(rdl, vt100_left_arr);
 218                         break;
 219
 220                 case CMDLINE_KEY_CTRL_F:
 221                 case CMDLINE_KEY_RIGHT_ARR:
 222                         if (CIRBUF_IS_EMPTY(&rdl->right))
 223                                 break;
 224                         tmp = cirbuf_get_head(&rdl->right);
 225                         cirbuf_del_head(&rdl->right);
 226                         cirbuf_add_tail(&rdl->left, tmp);
 227                         rdline_puts(rdl, vt100_right_arr);
 228                         break;
 229
 230                 case CMDLINE_KEY_WLEFT:
 231                         while (! CIRBUF_IS_EMPTY(&rdl->left) &&
 232                                (tmp = cirbuf_get_tail(&rdl->left)) &&
 233                                isblank2(tmp)) {
 234                                 rdline_puts(rdl, vt100_left_arr);
 235                                 cirbuf_del_tail(&rdl->left);
 236                                 cirbuf_add_head(&rdl->right, tmp);
 237                         }
 238                         while (! CIRBUF_IS_EMPTY(&rdl->left) &&
 239                                (tmp = cirbuf_get_tail(&rdl->left)) &&
 240                                !isblank2(tmp)) {
 241                                 rdline_puts(rdl, vt100_left_arr);
 242                                 cirbuf_del_tail(&rdl->left);
 243                                 cirbuf_add_head(&rdl->right, tmp);
 244                         }
 245                         break;
 246
 247                 case CMDLINE_KEY_WRIGHT:
 248                         while (! CIRBUF_IS_EMPTY(&rdl->right) &&
 249                                (tmp = cirbuf_get_head(&rdl->right)) &&
 250                                isblank2(tmp)) {
 251                                 rdline_puts(rdl, vt100_right_arr);
 252                                 cirbuf_del_head(&rdl->right);
 253                                 cirbuf_add_tail(&rdl->left, tmp);
 254                         }
 255                         while (! CIRBUF_IS_EMPTY(&rdl->right) &&
 256                                (tmp = cirbuf_get_head(&rdl->right)) &&
 257                                !isblank2(tmp)) {
 258                                 rdline_puts(rdl, vt100_right_arr);
 259                                 cirbuf_del_head(&rdl->right);
 260                                 cirbuf_add_tail(&rdl->left, tmp);
 261                         }
 262                         break;
 263
 264                 case CMDLINE_KEY_BKSPACE:
 265                         if(!cirbuf_del_tail_safe(&rdl->left)) {
 266                                 rdline_puts(rdl, vt100_bs);
 267                                 display_right_buffer(rdl);
 268                         }
 269                         break;
 270
 271                 case CMDLINE_KEY_META_BKSPACE:
 272                         while (! CIRBUF_IS_EMPTY(&rdl->left) && isblank2(cirbuf_get_tail(&rdl->left))) {
 273                                 rdline_puts(rdl, vt100_bs);
 274                                 cirbuf_del_tail(&rdl->left);
 275                         }
 276                         while (! CIRBUF_IS_EMPTY(&rdl->left) && !isblank2(cirbuf_get_tail(&rdl->left))) {
 277                                 rdline_puts(rdl, vt100_bs);
 278                                 cirbuf_del_tail(&rdl->left);
 279                         }
 280                         display_right_buffer(rdl);
 281                         break;
 282
 283                 case CMDLINE_KEY_SUPPR:
 284                 case CMDLINE_KEY_CTRL_D:
 285                         if (cmd == CMDLINE_KEY_CTRL_D &&
 286                             CIRBUF_IS_EMPTY(&rdl->left) &&
 287                             CIRBUF_IS_EMPTY(&rdl->right)) {
 288                                 return RDLINE_RES_EOF;
 289                         }
 290                         if (!cirbuf_del_head_safe(&rdl->right)) {
 291                                 display_right_buffer(rdl);
 292                         }
 293                         break;
 294
 295                 case CMDLINE_KEY_CTRL_A:
 296                         if (CIRBUF_IS_EMPTY(&rdl->left))
 297                                 break;
 298                         rdline_miniprintf(rdl, vt100_multi_left,
 299                                             CIRBUF_GET_LEN(&rdl->left));
 300                         while (! CIRBUF_IS_EMPTY(&rdl->left)) {
 301                                 tmp = cirbuf_get_tail(&rdl->left);
 302                                 cirbuf_del_tail(&rdl->left);
 303                                 cirbuf_add_head(&rdl->right, tmp);
 304                         }
 305                         break;
 306
 307                 case CMDLINE_KEY_CTRL_E:
 308                         if (CIRBUF_IS_EMPTY(&rdl->right))
 309                                 break;
 310                         rdline_miniprintf(rdl, vt100_multi_right,
 311                                             CIRBUF_GET_LEN(&rdl->right));
 312                         while (! CIRBUF_IS_EMPTY(&rdl->right)) {
 313                                 tmp = cirbuf_get_head(&rdl->right);
 314                                 cirbuf_del_head(&rdl->right);
 315                                 cirbuf_add_tail(&rdl->left, tmp);
 316                         }
 317                         break;
 318
 319 #ifndef NO_RDLINE_KILL_BUF
 320                 case CMDLINE_KEY_CTRL_K:
 321                         cirbuf_get_buf_head(&rdl->right, rdl->kill_buf, RDLINE_BUF_SIZE);
 322                         rdl->kill_size = CIRBUF_GET_LEN(&rdl->right);
 323                         cirbuf_del_buf_head(&rdl->right, rdl->kill_size);
 324                         rdline_puts(rdl, vt100_clear_right);
 325                         break;
 326
 327                 case CMDLINE_KEY_CTRL_Y:
 328                         i=0;
 329                         while(CIRBUF_GET_LEN(&rdl->right) + CIRBUF_GET_LEN(&rdl->left) <
 330                               RDLINE_BUF_SIZE &&
 331                               i < rdl->kill_size) {
 332                                 cirbuf_add_tail(&rdl->left, rdl->kill_buf[i]);
 333                                 rdl->write_char(rdl, rdl->kill_buf[i]);
 334                                 i++;
 335                         }
 336                         display_right_buffer(rdl);
 337                         break;
 338 #endif /* !NO_RDLINE_KILL_BUF */
 339
 340                 case CMDLINE_KEY_CTRL_C:
 341                         rdline_puts(rdl, "\r\n");
 342                         rdline_newline(rdl, rdl->prompt);
 343                         break;
 344
 345                 case CMDLINE_KEY_CTRL_L:
 346                         rdline_redisplay(rdl);
 347                         break;
 348
 349                 case CMDLINE_KEY_TAB:
 350                 case CMDLINE_KEY_HELP:
 351                         cirbuf_align_left(&rdl->left);
 352                         rdl->left_buf[CIRBUF_GET_LEN(&rdl->left)] = '\0';
 353                         if (rdl->complete) {
 354                                 char tmp_buf[BUFSIZ];
 355                                 int complete_state;
 356                                 int ret;
 357                                 unsigned int tmp_size;
 358
 359                                 if (cmd == CMDLINE_KEY_TAB)
 360                                         complete_state = 0;
 361                                 else
 362                                         complete_state = -1;
 363
 364                                 /* see in parse.h for help on complete() */
 365                                 ret = rdl->complete(rdl, rdl->left_buf,
 366                                                     tmp_buf, sizeof(tmp_buf),
 367                                                     &complete_state);
 368                                 /* no completion or error */
 369                                 if (ret <= 0) {
 370                                         return RDLINE_RES_COMPLETE;
 371                                 }
 372
 373                                 tmp_size = strlen(tmp_buf);
 374                                 /* add chars */
 375                                 if (ret == RDLINE_RES_COMPLETE) {
 376                                         i=0;
 377                                         while(CIRBUF_GET_LEN(&rdl->right) + CIRBUF_GET_LEN(&rdl->left) <
 378                                               RDLINE_BUF_SIZE &&
 379                                               i < tmp_size) {
 380                                                 cirbuf_add_tail(&rdl->left, tmp_buf[i]);
 381                                                 rdl->write_char(rdl, tmp_buf[i]);
 382                                                 i++;
 383                                         }
 384                                         display_right_buffer(rdl);
 385                                         return RDLINE_RES_COMPLETE; /* ?? */
 386                                 }
 387
 388                                 /* choice */
 389                                 rdline_puts(rdl, "\r\n");
 390                                 while (ret) {
 391                                         rdl->write_char(rdl, ' ');
 392                                         for (i=0 ; tmp_buf[i] ; i++)
 393                                                 rdl->write_char(rdl, tmp_buf[i]);
 394                                         rdline_puts(rdl, "\r\n");
 395                                         ret = rdl->complete(rdl, rdl->left_buf,
 396                                                             tmp_buf, sizeof(tmp_buf),
 397                                                             &complete_state);
 398                                 }
 399
 400                                 rdline_redisplay(rdl);
 401                         }
 402                         return RDLINE_RES_COMPLETE;
 403
 404                 case CMDLINE_KEY_RETURN:
 405                 case CMDLINE_KEY_RETURN2:
 406                         rdline_get_buffer(rdl);
 407                         rdl->status = RDLINE_INIT;
 408                         rdline_puts(rdl, "\r\n");
 409 #ifndef NO_RDLINE_HISTORY
 410                         if (rdl->history_cur_line != -1)
 411                                 rdline_remove_first_history_item(rdl);
 412 #endif
 413
 414                         if (rdl->validate)
 415                                 rdl->validate(rdl, rdl->left_buf, CIRBUF_GET_LEN(&rdl->left)+2);
 416                         return RDLINE_RES_VALIDATED;
 417
 418 #ifndef NO_RDLINE_HISTORY
 419                 case CMDLINE_KEY_UP_ARR:
 420                         if (rdl->history_cur_line == 0) {
 421                                 rdline_remove_first_history_item(rdl);
 422                         }
 423                         if (rdl->history_cur_line <= 0) {
 424                                 rdline_add_history(rdl, rdline_get_buffer(rdl));
 425                                 rdl->history_cur_line = 0;
 426                         }
 427
 428                         buf = rdline_get_history_item(rdl, rdl->history_cur_line + 1);
 429                         if (!buf)
 430                                 break;
 431
 432                         rdl->history_cur_line ++;
 433                         vt100_init(&rdl->vt100);
 434                         cirbuf_init(&rdl->left, rdl->left_buf, 0, RDLINE_BUF_SIZE);
 435                         cirbuf_init(&rdl->right, rdl->right_buf, 0, RDLINE_BUF_SIZE);
 436                         cirbuf_add_buf_tail(&rdl->left, buf, strlen(buf));
 437                         rdline_redisplay(rdl);
 438                         break;
 439
 440                 case CMDLINE_KEY_DOWN_ARR:
 441                         if (rdl->history_cur_line - 1 < 0)
 442                                 break;
 443
 444                         rdl->history_cur_line --;
 445                         buf = rdline_get_history_item(rdl, rdl->history_cur_line);
 446                         if (!buf)
 447                                 break;
 448                         vt100_init(&rdl->vt100);
 449                         cirbuf_init(&rdl->left, rdl->left_buf, 0, RDLINE_BUF_SIZE);
 450                         cirbuf_init(&rdl->right, rdl->right_buf, 0, RDLINE_BUF_SIZE);
 451                         cirbuf_add_buf_tail(&rdl->left, buf, strlen(buf));
 452                         rdline_redisplay(rdl);
 453
 454                         break;
 455 #endif /* !NO_RDLINE_HISTORY */
 456
 457
 458                 default:
 459                         break;
 460                 }
 461
 462                 return RDLINE_RES_SUCCESS;
 463         }
 464
 465         if (!isprint((int)c))
 466                 return RDLINE_RES_SUCCESS;
 467
 468         /* standard chars */
 469         if (CIRBUF_GET_LEN(&rdl->left) + CIRBUF_GET_LEN(&rdl->right) >= RDLINE_BUF_SIZE)
 470                 return RDLINE_RES_SUCCESS;
 471
 472         if (cirbuf_add_tail_safe(&rdl->left, c))
 473                 return RDLINE_RES_SUCCESS;
 474
 475         rdl->write_char(rdl, c);
 476         display_right_buffer(rdl);
 477
 478         return RDLINE_RES_SUCCESS;
 479 }
 480
 481
 482 /* HISTORY */
 483
 484 #ifndef NO_RDLINE_HISTORY
 485 static void
 486 rdline_remove_old_history_item(struct rdline * rdl)
 487 {
 488         char tmp;
 489
 490         while (! CIRBUF_IS_EMPTY(&rdl->history) ) {
 491                 tmp = cirbuf_get_head(&rdl->history);
 492                 cirbuf_del_head(&rdl->history);
 493                 if (!tmp)
 494                         break;
 495         }
 496 }
 497
 498 static void
 499 rdline_remove_first_history_item(struct rdline * rdl)
 500 {
 501         char tmp;
 502
 503         if ( CIRBUF_IS_EMPTY(&rdl->history) ) {
 504                 return;
 505         }
 506         else {
 507                 cirbuf_del_tail(&rdl->history);
 508         }
 509
 510         while (! CIRBUF_IS_EMPTY(&rdl->history) ) {
 511                 tmp = cirbuf_get_tail(&rdl->history);
 512                 if (!tmp)
 513                         break;
 514                 cirbuf_del_tail(&rdl->history);
 515         }
 516 }
 517
 518 static unsigned int
 519 rdline_get_history_size(struct rdline * rdl)
 520 {
 521         unsigned int i, tmp, ret=0;
 522
 523         CIRBUF_FOREACH(&rdl->history, i, tmp) {
 524                 if (tmp == 0)
 525                         ret ++;
 526         }
 527
 528         return ret;
 529 }
 530
 531 char *
 532 rdline_get_history_item(struct rdline * rdl, unsigned int idx)
 533 {
 534         unsigned int len, i, tmp;
 535
 536         len = rdline_get_history_size(rdl);
 537         if ( idx >= len ) {
 538                 return NULL;
 539         }
 540
 541         cirbuf_align_left(&rdl->history);
 542
 543         CIRBUF_FOREACH(&rdl->history, i, tmp) {
 544                 if ( idx == len - 1) {
 545                         return rdl->history_buf + i;
 546                 }
 547                 if (tmp == 0)
 548                         len --;
 549         }
 550
 551         return NULL;
 552 }
 553
 554 int
 555 rdline_add_history(struct rdline * rdl, const char * buf)
 556 {
 557         unsigned int len, i;
 558
 559         len = strlen(buf);
 560         for (i=0; i<len ; i++) {
 561                 if (buf[i] == '\n') {
 562                         len = i;
 563                         break;
 564                 }
 565         }
 566
 567         if ( len >= RDLINE_HISTORY_BUF_SIZE )
 568                 return -1;
 569
 570         while ( len >= CIRBUF_GET_FREELEN(&rdl->history) ) {
 571                 rdline_remove_old_history_item(rdl);
 572         }
 573
 574         cirbuf_add_buf_tail(&rdl->history, buf, len);
 575         cirbuf_add_tail(&rdl->history, 0);
 576
 577         return 0;
 578 }
 579
 580 void
 581 rdline_clear_history(struct rdline * rdl)
 582 {
 583         cirbuf_init(&rdl->history, rdl->history_buf, 0, RDLINE_HISTORY_BUF_SIZE);
 584 }
 585
 586 #else /* !NO_RDLINE_HISTORY */
 587
 588 int rdline_add_history(struct rdline * rdl, const char * buf) {return -1;}
 589 void rdline_clear_history(struct rdline * rdl) {}
 590 char * rdline_get_history_item(struct rdline * rdl, unsigned int i) {return NULL;}
 591
 592
 593 #endif /* !NO_RDLINE_HISTORY */
 594
 595
 596 /* STATIC USEFUL FUNCS */
 597
 598 static void
 599 rdline_puts(struct rdline * rdl, const char * buf)
 600 {
 601         char c;
 602         while ( (c = *(buf++)) != '\0' ) {
 603                 rdl->write_char(rdl, c);
 604         }
 605 }
 606
 607 /* a very very basic printf with one arg and one format 'u' */
 608 static void
 609 rdline_miniprintf(struct rdline *rdl, const char * buf, unsigned int val)
 610 {
 611         char c, started=0, div=100;
 612
 613         while ( (c=*(buf++)) ) {
 614                 if (c != '%') {
 615                         rdl->write_char(rdl, c);
 616                         continue;
 617                 }
 618                 c = *(buf++);
 619                 if (c != 'u') {
 620                         rdl->write_char(rdl, '%');
 621                         rdl->write_char(rdl, c);
 622                         continue;
 623                 }
 624                 /* val is never more than 255 */
 625                 while (div) {
 626                         c = (char)(val / div);
 627                         if (c || started) {
 628                                 rdl->write_char(rdl, (char)(c+'0'));
 629                                 started = 1;
 630                         }
 631                         val %= div;
 632                         div /= 10;
 633                 }
 634         }
 635 }
 636