lib/librte_cmdline/cmdline_parse.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  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 FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  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 <stdio.h>
  63 #include <stdarg.h>
  64 #include <errno.h>
  65 #include <string.h>
  66 #include <inttypes.h>
  67 #include <ctype.h>
  68 #include <termios.h>
  69
  70 #include <netinet/in.h>
  71
  72 #include <rte_string_fns.h>
  73
  74 #include "cmdline_rdline.h"
  75 #include "cmdline_parse.h"
  76 #include "cmdline.h"
  77
  78 #ifdef RTE_LIBRTE_CMDLINE_DEBUG
  79 #define debug_printf printf
  80 #else
  81 #define debug_printf(args...) do {} while(0)
  82 #endif
  83
  84 #define CMDLINE_BUFFER_SIZE 64
  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 static int
  98 isendofline(char c)
  99 {
 100         if (c == '\n' ||
 101             c == '\r' )
 102                 return 1;
 103         return 0;
 104 }
 105
 106 static int
 107 iscomment(char c)
 108 {
 109         if (c == '#')
 110                 return 1;
 111         return 0;
 112 }
 113
 114 int
 115 cmdline_isendoftoken(char c)
 116 {
 117         if (!c || iscomment(c) || isblank2(c) || isendofline(c))
 118                 return 1;
 119         return 0;
 120 }
 121
 122 static unsigned int
 123 nb_common_chars(const char * s1, const char * s2)
 124 {
 125         unsigned int i=0;
 126
 127         while (*s1==*s2 && *s1 && *s2) {
 128                 s1++;
 129                 s2++;
 130                 i++;
 131         }
 132         return i;
 133 }
 134
 135 /**
 136  * try to match the buffer with an instruction (only the first
 137  * nb_match_token tokens if != 0). Return 0 if we match all the
 138  * tokens, else the number of matched tokens, else -1.
 139  */
 140 static int
 141 match_inst(cmdline_parse_inst_t *inst, const char *buf,
 142            unsigned int nb_match_token, void * result_buf)
 143 {
 144         unsigned int token_num=0;
 145         cmdline_parse_token_hdr_t * token_p;
 146         unsigned int i=0;
 147         int n = 0;
 148         struct cmdline_token_hdr token_hdr;
 149
 150         token_p = inst->tokens[token_num];
 151         if (token_p)
 152                 memcpy(&token_hdr, token_p, sizeof(token_hdr));
 153
 154         /* check if we match all tokens of inst */
 155         while (token_p && (!nb_match_token || i<nb_match_token)) {
 156                 debug_printf("TK\n");
 157                 /* skip spaces */
 158                 while (isblank2(*buf)) {
 159                         buf++;
 160                 }
 161
 162                 /* end of buf */
 163                 if ( isendofline(*buf) || iscomment(*buf) )
 164                         break;
 165
 166                 if (result_buf)
 167                         n = token_hdr.ops->parse(token_p, buf,
 168                                                  (char *)result_buf +
 169                                                  token_hdr.offset);
 170                 else
 171                         n = token_hdr.ops->parse(token_p, buf, NULL);
 172
 173                 if (n < 0)
 174                         break;
 175
 176                 debug_printf("TK parsed (len=%d)\n", n);
 177                 i++;
 178                 buf += n;
 179
 180                 token_num ++;
 181                 token_p = inst->tokens[token_num];
 182                 if (token_p)
 183                         memcpy(&token_hdr, token_p, sizeof(token_hdr));
 184         }
 185
 186         /* does not match */
 187         if (i==0)
 188                 return -1;
 189
 190         /* in case we want to match a specific num of token */
 191         if (nb_match_token) {
 192                 if (i == nb_match_token) {
 193                         return 0;
 194                 }
 195                 return i;
 196         }
 197
 198         /* we don't match all the tokens */
 199         if (token_p) {
 200                 return i;
 201         }
 202
 203         /* are there are some tokens more */
 204         while (isblank2(*buf)) {
 205                 buf++;
 206         }
 207
 208         /* end of buf */
 209         if ( isendofline(*buf) || iscomment(*buf) )
 210                 return 0;
 211
 212         /* garbage after inst */
 213         return i;
 214 }
 215
 216
 217 int
 218 cmdline_parse(struct cmdline *cl, const char * buf)
 219 {
 220         unsigned int inst_num=0;
 221         cmdline_parse_inst_t *inst;
 222         const char *curbuf;
 223         char result_buf[BUFSIZ];
 224         void (*f)(void *, struct cmdline *, void *) = NULL;
 225         void *data = NULL;
 226         int comment = 0;
 227         int linelen = 0;
 228         int parse_it = 0;
 229         int err = CMDLINE_PARSE_NOMATCH;
 230         int tok;
 231         cmdline_parse_ctx_t *ctx = cl->ctx;
 232 #ifdef RTE_LIBRTE_CMDLINE_DEBUG
 233         char debug_buf[BUFSIZ];
 234 #endif
 235
 236         /*
 237          * - look if the buffer contains at least one line
 238          * - look if line contains only spaces or comments
 239          * - count line length
 240          */
 241         curbuf = buf;
 242         while (! isendofline(*curbuf)) {
 243                 if ( *curbuf == '\0' ) {
 244                         debug_printf("Incomplete buf (len=%d)\n", linelen);
 245                         return 0;
 246                 }
 247                 if ( iscomment(*curbuf) ) {
 248                         comment = 1;
 249                 }
 250                 if ( ! isblank2(*curbuf) && ! comment) {
 251                         parse_it = 1;
 252                 }
 253                 curbuf++;
 254                 linelen++;
 255         }
 256
 257         /* skip all endofline chars */
 258         while (isendofline(buf[linelen])) {
 259                 linelen++;
 260         }
 261
 262         /* empty line */
 263         if ( parse_it == 0 ) {
 264                 debug_printf("Empty line (len=%d)\n", linelen);
 265                 return linelen;
 266         }
 267
 268 #ifdef RTE_LIBRTE_CMDLINE_DEBUG
 269         rte_snprintf(debug_buf, (linelen>64 ? 64 : linelen), "%s", buf);
 270         debug_printf("Parse line : len=%d, <%s>\n", linelen, debug_buf);
 271 #endif
 272
 273         /* parse it !! */
 274         inst = ctx[inst_num];
 275         while (inst) {
 276                 debug_printf("INST %d\n", inst_num);
 277
 278                 /* fully parsed */
 279                 tok = match_inst(inst, buf, 0, result_buf);
 280
 281                 if (tok > 0) /* we matched at least one token */
 282                         err = CMDLINE_PARSE_BAD_ARGS;
 283
 284                 else if (!tok) {
 285                         debug_printf("INST fully parsed\n");
 286                         /* skip spaces */
 287                         while (isblank2(*curbuf)) {
 288                                 curbuf++;
 289                         }
 290
 291                         /* if end of buf -> there is no garbage after inst */
 292                         if (isendofline(*curbuf) || iscomment(*curbuf)) {
 293                                 if (!f) {
 294                                         memcpy(&f, &inst->f, sizeof(f));
 295                                         memcpy(&data, &inst->data, sizeof(data));
 296                                 }
 297                                 else {
 298                                         /* more than 1 inst matches */
 299                                         err = CMDLINE_PARSE_AMBIGUOUS;
 300                                         f=NULL;
 301                                         debug_printf("Ambiguous cmd\n");
 302                                         break;
 303                                 }
 304                         }
 305                 }
 306
 307                 inst_num ++;
 308                 inst = ctx[inst_num];
 309         }
 310
 311         /* call func */
 312         if (f) {
 313                 f(result_buf, cl, data);
 314         }
 315
 316         /* no match */
 317         else {
 318                 debug_printf("No match err=%d\n", err);
 319                 return err;
 320         }
 321
 322         return linelen;
 323 }
 324
 325 int
 326 cmdline_complete(struct cmdline *cl, const char *buf, int *state,
 327                  char *dst, unsigned int size)
 328 {
 329         const char *partial_tok = buf;
 330         unsigned int inst_num = 0;
 331         cmdline_parse_inst_t *inst;
 332         cmdline_parse_token_hdr_t *token_p;
 333         struct cmdline_token_hdr token_hdr;
 334         char tmpbuf[CMDLINE_BUFFER_SIZE], comp_buf[CMDLINE_BUFFER_SIZE];
 335         unsigned int partial_tok_len;
 336         int comp_len = -1;
 337         int tmp_len = -1;
 338         int nb_token = 0;
 339         unsigned int i, n;
 340         int l;
 341         unsigned int nb_completable;
 342         unsigned int nb_non_completable;
 343         int local_state = 0;
 344         const char *help_str;
 345         cmdline_parse_ctx_t *ctx = cl->ctx;
 346
 347         debug_printf("%s called\n", __func__);
 348         memset(&token_hdr, 0, sizeof(token_hdr));
 349
 350         /* count the number of complete token to parse */
 351         for (i=0 ; buf[i] ; i++) {
 352                 if (!isblank2(buf[i]) && isblank2(buf[i+1]))
 353                         nb_token++;
 354                 if (isblank2(buf[i]) && !isblank2(buf[i+1]))
 355                         partial_tok = buf+i+1;
 356         }
 357         partial_tok_len = strnlen(partial_tok, RDLINE_BUF_SIZE);
 358
 359         /* first call -> do a first pass */
 360         if (*state <= 0) {
 361                 debug_printf("try complete <%s>\n", buf);
 362                 debug_printf("there is %d complete tokens, <%s> is incomplete\n",
 363                              nb_token, partial_tok);
 364
 365                 nb_completable = 0;
 366                 nb_non_completable = 0;
 367
 368                 inst = ctx[inst_num];
 369                 while (inst) {
 370                         /* parse the first tokens of the inst */
 371                         if (nb_token && match_inst(inst, buf, nb_token, NULL))
 372                                 goto next;
 373
 374                         debug_printf("instruction match \n");
 375                         token_p = inst->tokens[nb_token];
 376                         if (token_p)
 377                                 memcpy(&token_hdr, token_p, sizeof(token_hdr));
 378
 379                         /* non completable */
 380                         if (!token_p ||
 381                             !token_hdr.ops->complete_get_nb ||
 382                             !token_hdr.ops->complete_get_elt ||
 383                             (n = token_hdr.ops->complete_get_nb(token_p)) == 0) {
 384                                 nb_non_completable++;
 385                                 goto next;
 386                         }
 387
 388                         debug_printf("%d choices for this token\n", n);
 389                         for (i=0 ; i<n ; i++) {
 390                                 if (token_hdr.ops->complete_get_elt(token_p, i,
 391                                                                     tmpbuf,
 392                                                                     sizeof(tmpbuf)) < 0)
 393                                         continue;
 394
 395                                 /* we have at least room for one char */
 396                                 tmp_len = strnlen(tmpbuf, sizeof(tmpbuf));
 397                                 if (tmp_len < CMDLINE_BUFFER_SIZE - 1) {
 398                                         tmpbuf[tmp_len] = ' ';
 399                                         tmpbuf[tmp_len+1] = 0;
 400                                 }
 401
 402                                 debug_printf("   choice <%s>\n", tmpbuf);
 403
 404                                 /* does the completion match the
 405                                  * beginning of the word ? */
 406                                 if (!strncmp(partial_tok, tmpbuf,
 407                                              partial_tok_len)) {
 408                                         if (comp_len == -1) {
 409                                                 rte_snprintf(comp_buf, sizeof(comp_buf),
 410                                                          "%s", tmpbuf + partial_tok_len);
 411                                                 comp_len =
 412                                                         strnlen(tmpbuf + partial_tok_len,
 413                                                                         sizeof(tmpbuf) - partial_tok_len);
 414
 415                                         }
 416                                         else {
 417                                                 comp_len =
 418                                                         nb_common_chars(comp_buf,
 419                                                                         tmpbuf+partial_tok_len);
 420                                                 comp_buf[comp_len] = 0;
 421                                         }
 422                                         nb_completable++;
 423                                 }
 424                         }
 425                 next:
 426                         inst_num ++;
 427                         inst = ctx[inst_num];
 428                 }
 429
 430                 debug_printf("total choices %d for this completion\n",
 431                              nb_completable);
 432
 433                 /* no possible completion */
 434                 if (nb_completable == 0 && nb_non_completable == 0)
 435                         return 0;
 436
 437                 /* if multichoice is not required */
 438                 if (*state == 0 && partial_tok_len > 0) {
 439                         /* one or several choices starting with the
 440                            same chars */
 441                         if (comp_len > 0) {
 442                                 if ((unsigned)(comp_len + 1) > size)
 443                                         return 0;
 444
 445                                 rte_snprintf(dst, size, "%s", comp_buf);
 446                                 dst[comp_len] = 0;
 447                                 return 2;
 448                         }
 449                 }
 450         }
 451
 452         /* init state correctly */
 453         if (*state == -1)
 454                 *state = 0;
 455
 456         debug_printf("Multiple choice STATE=%d\n", *state);
 457
 458         inst_num = 0;
 459         inst = ctx[inst_num];
 460         while (inst) {
 461                 /* we need to redo it */
 462                 inst = ctx[inst_num];
 463
 464                 if (nb_token && match_inst(inst, buf, nb_token, NULL))
 465                         goto next2;
 466
 467                 token_p = inst->tokens[nb_token];
 468                 if (token_p)
 469                         memcpy(&token_hdr, token_p, sizeof(token_hdr));
 470
 471                 /* one choice for this token */
 472                 if (!token_p ||
 473                     !token_hdr.ops->complete_get_nb ||
 474                     !token_hdr.ops->complete_get_elt ||
 475                     (n = token_hdr.ops->complete_get_nb(token_p)) == 0) {
 476                         if (local_state < *state) {
 477                                 local_state++;
 478                                 goto next2;
 479                         }
 480                         (*state)++;
 481                         if (token_p && token_hdr.ops->get_help) {
 482                                 token_hdr.ops->get_help(token_p, tmpbuf,
 483                                                         sizeof(tmpbuf));
 484                                 help_str = inst->help_str;
 485                                 if (help_str)
 486                                         rte_snprintf(dst, size, "[%s]: %s", tmpbuf,
 487                                                  help_str);
 488                                 else
 489                                         rte_snprintf(dst, size, "[%s]: No help",
 490                                                  tmpbuf);
 491                         }
 492                         else {
 493                                 rte_snprintf(dst, size, "[RETURN]");
 494                         }
 495                         return 1;
 496                 }
 497
 498                 /* several choices */
 499                 for (i=0 ; i<n ; i++) {
 500                         if (token_hdr.ops->complete_get_elt(token_p, i, tmpbuf,
 501                                                             sizeof(tmpbuf)) < 0)
 502                                 continue;
 503                         /* we have at least room for one char */
 504                         tmp_len = strnlen(tmpbuf, sizeof(tmpbuf));
 505                         if (tmp_len < CMDLINE_BUFFER_SIZE - 1) {
 506                                 tmpbuf[tmp_len] = ' ';
 507                                 tmpbuf[tmp_len + 1] = 0;
 508                         }
 509
 510                         debug_printf("   choice <%s>\n", tmpbuf);
 511
 512                         /* does the completion match the beginning of
 513                          * the word ? */
 514                         if (!strncmp(partial_tok, tmpbuf,
 515                                      partial_tok_len)) {
 516                                 if (local_state < *state) {
 517                                         local_state++;
 518                                         continue;
 519                                 }
 520                                 (*state)++;
 521                                 l=rte_snprintf(dst, size, "%s", tmpbuf);
 522                                 if (l>=0 && token_hdr.ops->get_help) {
 523                                         token_hdr.ops->get_help(token_p, tmpbuf,
 524                                                                 sizeof(tmpbuf));
 525                                         help_str = inst->help_str;
 526                                         if (help_str)
 527                                                 rte_snprintf(dst+l, size-l, "[%s]: %s",
 528                                                          tmpbuf, help_str);
 529                                         else
 530                                                 rte_snprintf(dst+l, size-l,
 531                                                          "[%s]: No help", tmpbuf);
 532                                 }
 533
 534                                 return 1;
 535                         }
 536                 }
 537         next2:
 538                 inst_num ++;
 539                 inst = ctx[inst_num];
 540         }
 541         return 0;
 542 }
 543