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