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_quit(struct rdline *rdl)
 140 {
 141         rdl->status = RDLINE_EXITED;
 142 }
 143
 144 void
 145 rdline_restart(struct rdline *rdl)
 146 {
 147         rdl->status = RDLINE_RUNNING;
 148 }
 149
 150 const char *
 151 rdline_get_buffer(struct rdline *rdl)
 152 {
 153         unsigned int len_l, len_r;
 154         cirbuf_align_left(&rdl->left);
 155         cirbuf_align_left(&rdl->right);
 156
 157         len_l = CIRBUF_GET_LEN(&rdl->left);
 158         len_r = CIRBUF_GET_LEN(&rdl->right);
 159         memcpy(rdl->left_buf+len_l, rdl->right_buf, len_r);
 160
 161         rdl->left_buf[len_l + len_r] = '\n';
 162         rdl->left_buf[len_l + len_r + 1] = '\0';
 163         return rdl->left_buf;
 164 }
 165
 166 static void
 167 display_right_buffer(struct rdline *rdl)
 168 {
 169         unsigned int i;
 170         char tmp;
 171
 172         if (CIRBUF_IS_EMPTY(&rdl->right))
 173                 return;
 174
 175         rdline_puts(rdl, vt100_clear_right);
 176         CIRBUF_FOREACH(&rdl->right, i, tmp) {
 177                 rdl->write_char(rdl, tmp);
 178         }
 179         rdline_miniprintf(rdl, vt100_multi_left,
 180                           CIRBUF_GET_LEN(&rdl->right));
 181 }
 182
 183 void
 184 rdline_redisplay(struct rdline *rdl)
 185 {
 186         unsigned int i;
 187         char tmp;
 188
 189         rdline_puts(rdl, vt100_home);
 190         for (i=0 ; i<rdl->prompt_size ; i++)
 191                 rdl->write_char(rdl, rdl->prompt[i]);
 192         CIRBUF_FOREACH(&rdl->left, i, tmp) {
 193                 rdl->write_char(rdl, tmp);
 194         }
 195         display_right_buffer(rdl);
 196 }
 197
 198 int
 199 rdline_char_in(struct rdline *rdl, char c)
 200 {
 201         unsigned int i;
 202         int cmd;
 203         char tmp;
 204 #ifndef NO_RDLINE_HISTORY
 205         char *buf;
 206 #endif
 207
 208         if (rdl->status == RDLINE_EXITED)
 209                 return RDLINE_RES_EXITED;
 210         if (rdl->status != RDLINE_RUNNING)
 211                 return RDLINE_RES_NOT_RUNNING;
 212
 213         cmd = vt100_parser(&rdl->vt100, c);
 214         if (cmd == -2)
 215                 return RDLINE_RES_SUCCESS;
 216
 217         if (cmd >= 0) {
 218                 switch (cmd) {
 219                 case CMDLINE_KEY_CTRL_B:
 220                 case CMDLINE_KEY_LEFT_ARR:
 221                         if (CIRBUF_IS_EMPTY(&rdl->left))
 222                                 break;
 223                         tmp = cirbuf_get_tail(&rdl->left);
 224                         cirbuf_del_tail(&rdl->left);
 225                         cirbuf_add_head(&rdl->right, tmp);
 226                         rdline_puts(rdl, vt100_left_arr);
 227                         break;
 228
 229                 case CMDLINE_KEY_CTRL_F:
 230                 case CMDLINE_KEY_RIGHT_ARR:
 231                         if (CIRBUF_IS_EMPTY(&rdl->right))
 232                                 break;
 233                         tmp = cirbuf_get_head(&rdl->right);
 234                         cirbuf_del_head(&rdl->right);
 235                         cirbuf_add_tail(&rdl->left, tmp);
 236                         rdline_puts(rdl, vt100_right_arr);
 237                         break;
 238
 239                 case CMDLINE_KEY_WLEFT:
 240                         while (! CIRBUF_IS_EMPTY(&rdl->left) &&
 241                                (tmp = cirbuf_get_tail(&rdl->left)) &&
 242                                isblank2(tmp)) {
 243                                 rdline_puts(rdl, vt100_left_arr);
 244                                 cirbuf_del_tail(&rdl->left);
 245                                 cirbuf_add_head(&rdl->right, tmp);
 246                         }
 247                         while (! CIRBUF_IS_EMPTY(&rdl->left) &&
 248                                (tmp = cirbuf_get_tail(&rdl->left)) &&
 249                                !isblank2(tmp)) {
 250                                 rdline_puts(rdl, vt100_left_arr);
 251                                 cirbuf_del_tail(&rdl->left);
 252                                 cirbuf_add_head(&rdl->right, tmp);
 253                         }
 254                         break;
 255
 256                 case CMDLINE_KEY_WRIGHT:
 257                         while (! CIRBUF_IS_EMPTY(&rdl->right) &&
 258                                (tmp = cirbuf_get_head(&rdl->right)) &&
 259                                isblank2(tmp)) {
 260                                 rdline_puts(rdl, vt100_right_arr);
 261                                 cirbuf_del_head(&rdl->right);
 262                                 cirbuf_add_tail(&rdl->left, tmp);
 263                         }
 264                         while (! CIRBUF_IS_EMPTY(&rdl->right) &&
 265                                (tmp = cirbuf_get_head(&rdl->right)) &&
 266                                !isblank2(tmp)) {
 267                                 rdline_puts(rdl, vt100_right_arr);
 268                                 cirbuf_del_head(&rdl->right);
 269                                 cirbuf_add_tail(&rdl->left, tmp);
 270                         }
 271                         break;
 272
 273                 case CMDLINE_KEY_BKSPACE:
 274                         if(!cirbuf_del_tail_safe(&rdl->left)) {
 275                                 rdline_puts(rdl, vt100_bs);
 276                                 display_right_buffer(rdl);
 277                         }
 278                         break;
 279
 280                 case CMDLINE_KEY_META_BKSPACE:
 281                         while (! CIRBUF_IS_EMPTY(&rdl->left) && isblank2(cirbuf_get_tail(&rdl->left))) {
 282                                 rdline_puts(rdl, vt100_bs);
 283                                 cirbuf_del_tail(&rdl->left);
 284                         }
 285                         while (! CIRBUF_IS_EMPTY(&rdl->left) && !isblank2(cirbuf_get_tail(&rdl->left))) {
 286                                 rdline_puts(rdl, vt100_bs);
 287                                 cirbuf_del_tail(&rdl->left);
 288                         }
 289                         display_right_buffer(rdl);
 290                         break;
 291
 292                 case CMDLINE_KEY_SUPPR:
 293                 case CMDLINE_KEY_CTRL_D:
 294                         if (cmd == CMDLINE_KEY_CTRL_D &&
 295                             CIRBUF_IS_EMPTY(&rdl->left) &&
 296                             CIRBUF_IS_EMPTY(&rdl->right)) {
 297                                 return RDLINE_RES_EOF;
 298                         }
 299                         if (!cirbuf_del_head_safe(&rdl->right)) {
 300                                 display_right_buffer(rdl);
 301                         }
 302                         break;
 303
 304                 case CMDLINE_KEY_CTRL_A:
 305                         if (CIRBUF_IS_EMPTY(&rdl->left))
 306                                 break;
 307                         rdline_miniprintf(rdl, vt100_multi_left,
 308                                             CIRBUF_GET_LEN(&rdl->left));
 309                         while (! CIRBUF_IS_EMPTY(&rdl->left)) {
 310                                 tmp = cirbuf_get_tail(&rdl->left);
 311                                 cirbuf_del_tail(&rdl->left);
 312                                 cirbuf_add_head(&rdl->right, tmp);
 313                         }
 314                         break;
 315
 316                 case CMDLINE_KEY_CTRL_E:
 317                         if (CIRBUF_IS_EMPTY(&rdl->right))
 318                                 break;
 319                         rdline_miniprintf(rdl, vt100_multi_right,
 320                                             CIRBUF_GET_LEN(&rdl->right));
 321                         while (! CIRBUF_IS_EMPTY(&rdl->right)) {
 322                                 tmp = cirbuf_get_head(&rdl->right);
 323                                 cirbuf_del_head(&rdl->right);
 324                                 cirbuf_add_tail(&rdl->left, tmp);
 325                         }
 326                         break;
 327
 328 #ifndef NO_RDLINE_KILL_BUF
 329                 case CMDLINE_KEY_CTRL_K:
 330                         cirbuf_get_buf_head(&rdl->right, rdl->kill_buf, RDLINE_BUF_SIZE);
 331                         rdl->kill_size = CIRBUF_GET_LEN(&rdl->right);
 332                         cirbuf_del_buf_head(&rdl->right, rdl->kill_size);
 333                         rdline_puts(rdl, vt100_clear_right);
 334                         break;
 335
 336                 case CMDLINE_KEY_CTRL_Y:
 337                         i=0;
 338                         while(CIRBUF_GET_LEN(&rdl->right) + CIRBUF_GET_LEN(&rdl->left) <
 339                               RDLINE_BUF_SIZE &&
 340                               i < rdl->kill_size) {
 341                                 cirbuf_add_tail(&rdl->left, rdl->kill_buf[i]);
 342                                 rdl->write_char(rdl, rdl->kill_buf[i]);
 343                                 i++;
 344                         }
 345                         display_right_buffer(rdl);
 346                         break;
 347 #endif /* !NO_RDLINE_KILL_BUF */
 348
 349                 case CMDLINE_KEY_CTRL_C:
 350                         rdline_puts(rdl, "\r\n");
 351                         rdline_newline(rdl, rdl->prompt);
 352                         break;
 353
 354                 case CMDLINE_KEY_CTRL_L:
 355                         rdline_redisplay(rdl);
 356                         break;
 357
 358                 case CMDLINE_KEY_TAB:
 359                 case CMDLINE_KEY_HELP:
 360                         cirbuf_align_left(&rdl->left);
 361                         rdl->left_buf[CIRBUF_GET_LEN(&rdl->left)] = '\0';
 362                         if (rdl->complete) {
 363                                 char tmp_buf[BUFSIZ];
 364                                 int complete_state;
 365                                 int ret;
 366                                 unsigned int tmp_size;
 367
 368                                 if (cmd == CMDLINE_KEY_TAB)
 369                                         complete_state = 0;
 370                                 else
 371                                         complete_state = -1;
 372
 373                                 /* see in parse.h for help on complete() */
 374                                 ret = rdl->complete(rdl, rdl->left_buf,
 375                                                     tmp_buf, sizeof(tmp_buf),
 376                                                     &complete_state);
 377                                 /* no completion or error */
 378                                 if (ret <= 0) {
 379                                         return RDLINE_RES_COMPLETE;
 380                                 }
 381
 382                                 tmp_size = strlen(tmp_buf);
 383                                 /* add chars */
 384                                 if (ret == RDLINE_RES_COMPLETE) {
 385                                         i=0;
 386                                         while(CIRBUF_GET_LEN(&rdl->right) + CIRBUF_GET_LEN(&rdl->left) <
 387                                               RDLINE_BUF_SIZE &&
 388                                               i < tmp_size) {
 389                                                 cirbuf_add_tail(&rdl->left, tmp_buf[i]);
 390                                                 rdl->write_char(rdl, tmp_buf[i]);
 391                                                 i++;
 392                                         }
 393                                         display_right_buffer(rdl);
 394                                         return RDLINE_RES_COMPLETE; /* ?? */
 395                                 }
 396
 397                                 /* choice */
 398                                 rdline_puts(rdl, "\r\n");
 399                                 while (ret) {
 400                                         rdl->write_char(rdl, ' ');
 401                                         for (i=0 ; tmp_buf[i] ; i++)
 402                                                 rdl->write_char(rdl, tmp_buf[i]);
 403                                         rdline_puts(rdl, "\r\n");
 404                                         ret = rdl->complete(rdl, rdl->left_buf,
 405                                                             tmp_buf, sizeof(tmp_buf),
 406                                                             &complete_state);
 407                                 }
 408
 409                                 rdline_redisplay(rdl);
 410                         }
 411                         return RDLINE_RES_COMPLETE;
 412
 413                 case CMDLINE_KEY_RETURN:
 414                 case CMDLINE_KEY_RETURN2:
 415                         rdline_get_buffer(rdl);
 416                         rdl->status = RDLINE_INIT;
 417                         rdline_puts(rdl, "\r\n");
 418 #ifndef NO_RDLINE_HISTORY
 419                         if (rdl->history_cur_line != -1)
 420                                 rdline_remove_first_history_item(rdl);
 421 #endif
 422
 423                         if (rdl->validate)
 424                                 rdl->validate(rdl, rdl->left_buf, CIRBUF_GET_LEN(&rdl->left)+2);
 425                         /* user may have stopped rdline */
 426                         if (rdl->status == RDLINE_EXITED)
 427                                 return RDLINE_RES_EXITED;
 428                         return RDLINE_RES_VALIDATED;
 429
 430 #ifndef NO_RDLINE_HISTORY
 431                 case CMDLINE_KEY_UP_ARR:
 432                         if (rdl->history_cur_line == 0) {
 433                                 rdline_remove_first_history_item(rdl);
 434                         }
 435                         if (rdl->history_cur_line <= 0) {
 436                                 rdline_add_history(rdl, rdline_get_buffer(rdl));
 437                                 rdl->history_cur_line = 0;
 438                         }
 439
 440                         buf = rdline_get_history_item(rdl, rdl->history_cur_line + 1);
 441                         if (!buf)
 442                                 break;
 443
 444                         rdl->history_cur_line ++;
 445                         vt100_init(&rdl->vt100);
 446                         cirbuf_init(&rdl->left, rdl->left_buf, 0, RDLINE_BUF_SIZE);
 447                         cirbuf_init(&rdl->right, rdl->right_buf, 0, RDLINE_BUF_SIZE);
 448                         cirbuf_add_buf_tail(&rdl->left, buf, strlen(buf));
 449                         rdline_redisplay(rdl);
 450                         break;
 451
 452                 case CMDLINE_KEY_DOWN_ARR:
 453                         if (rdl->history_cur_line - 1 < 0)
 454                                 break;
 455
 456                         rdl->history_cur_line --;
 457                         buf = rdline_get_history_item(rdl, rdl->history_cur_line);
 458                         if (!buf)
 459                                 break;
 460                         vt100_init(&rdl->vt100);
 461                         cirbuf_init(&rdl->left, rdl->left_buf, 0, RDLINE_BUF_SIZE);
 462                         cirbuf_init(&rdl->right, rdl->right_buf, 0, RDLINE_BUF_SIZE);
 463                         cirbuf_add_buf_tail(&rdl->left, buf, strlen(buf));
 464                         rdline_redisplay(rdl);
 465
 466                         break;
 467 #endif /* !NO_RDLINE_HISTORY */
 468
 469
 470                 default:
 471                         break;
 472                 }
 473
 474                 return RDLINE_RES_SUCCESS;
 475         }
 476
 477         if (!isprint((int)c))
 478                 return RDLINE_RES_SUCCESS;
 479
 480         /* standard chars */
 481         if (CIRBUF_GET_LEN(&rdl->left) + CIRBUF_GET_LEN(&rdl->right) >= RDLINE_BUF_SIZE)
 482                 return RDLINE_RES_SUCCESS;
 483
 484         if (cirbuf_add_tail_safe(&rdl->left, c))
 485                 return RDLINE_RES_SUCCESS;
 486
 487         rdl->write_char(rdl, c);
 488         display_right_buffer(rdl);
 489
 490         return RDLINE_RES_SUCCESS;
 491 }
 492
 493
 494 /* HISTORY */
 495
 496 #ifndef NO_RDLINE_HISTORY
 497 static void
 498 rdline_remove_old_history_item(struct rdline * rdl)
 499 {
 500         char tmp;
 501
 502         while (! CIRBUF_IS_EMPTY(&rdl->history) ) {
 503                 tmp = cirbuf_get_head(&rdl->history);
 504                 cirbuf_del_head(&rdl->history);
 505                 if (!tmp)
 506                         break;
 507         }
 508 }
 509
 510 static void
 511 rdline_remove_first_history_item(struct rdline * rdl)
 512 {
 513         char tmp;
 514
 515         if ( CIRBUF_IS_EMPTY(&rdl->history) ) {
 516                 return;
 517         }
 518         else {
 519                 cirbuf_del_tail(&rdl->history);
 520         }
 521
 522         while (! CIRBUF_IS_EMPTY(&rdl->history) ) {
 523                 tmp = cirbuf_get_tail(&rdl->history);
 524                 if (!tmp)
 525                         break;
 526                 cirbuf_del_tail(&rdl->history);
 527         }
 528 }
 529
 530 static unsigned int
 531 rdline_get_history_size(struct rdline * rdl)
 532 {
 533         unsigned int i, tmp, ret=0;
 534
 535         CIRBUF_FOREACH(&rdl->history, i, tmp) {
 536                 if (tmp == 0)
 537                         ret ++;
 538         }
 539
 540         return ret;
 541 }
 542
 543 char *
 544 rdline_get_history_item(struct rdline * rdl, unsigned int idx)
 545 {
 546         unsigned int len, i, tmp;
 547
 548         len = rdline_get_history_size(rdl);
 549         if ( idx >= len ) {
 550                 return NULL;
 551         }
 552
 553         cirbuf_align_left(&rdl->history);
 554
 555         CIRBUF_FOREACH(&rdl->history, i, tmp) {
 556                 if ( idx == len - 1) {
 557                         return rdl->history_buf + i;
 558                 }
 559                 if (tmp == 0)
 560                         len --;
 561         }
 562
 563         return NULL;
 564 }
 565
 566 int
 567 rdline_add_history(struct rdline * rdl, const char * buf)
 568 {
 569         unsigned int len, i;
 570
 571         len = strlen(buf);
 572         for (i=0; i<len ; i++) {
 573                 if (buf[i] == '\n') {
 574                         len = i;
 575                         break;
 576                 }
 577         }
 578
 579         if ( len >= RDLINE_HISTORY_BUF_SIZE )
 580                 return -1;
 581
 582         while ( len >= CIRBUF_GET_FREELEN(&rdl->history) ) {
 583                 rdline_remove_old_history_item(rdl);
 584         }
 585
 586         cirbuf_add_buf_tail(&rdl->history, buf, len);
 587         cirbuf_add_tail(&rdl->history, 0);
 588
 589         return 0;
 590 }
 591
 592 void
 593 rdline_clear_history(struct rdline * rdl)
 594 {
 595         cirbuf_init(&rdl->history, rdl->history_buf, 0, RDLINE_HISTORY_BUF_SIZE);
 596 }
 597
 598 #else /* !NO_RDLINE_HISTORY */
 599
 600 int rdline_add_history(struct rdline * rdl, const char * buf) {return -1;}
 601 void rdline_clear_history(struct rdline * rdl) {}
 602 char * rdline_get_history_item(struct rdline * rdl, unsigned int i) {return NULL;}
 603
 604
 605 #endif /* !NO_RDLINE_HISTORY */
 606
 607
 608 /* STATIC USEFUL FUNCS */
 609
 610 static void
 611 rdline_puts(struct rdline * rdl, const char * buf)
 612 {
 613         char c;
 614         while ( (c = *(buf++)) != '\0' ) {
 615                 rdl->write_char(rdl, c);
 616         }
 617 }
 618
 619 /* a very very basic printf with one arg and one format 'u' */
 620 static void
 621 rdline_miniprintf(struct rdline *rdl, const char * buf, unsigned int val)
 622 {
 623         char c, started=0, div=100;
 624
 625         while ( (c=*(buf++)) ) {
 626                 if (c != '%') {
 627                         rdl->write_char(rdl, c);
 628                         continue;
 629                 }
 630                 c = *(buf++);
 631                 if (c != 'u') {
 632                         rdl->write_char(rdl, '%');
 633                         rdl->write_char(rdl, c);
 634                         continue;
 635                 }
 636                 /* val is never more than 255 */
 637                 while (div) {
 638                         c = (char)(val / div);
 639                         if (c || started) {
 640                                 rdl->write_char(rdl, (char)(c+'0'));
 641                                 started = 1;
 642                         }
 643                         val %= div;
 644                         div /= 10;
 645                 }
 646         }
 647 }
 648