lib/librte_cmdline/cmdline_parse.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation.
   3  * Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
   4  * All rights reserved.
   5  */
   6
   7 #include <stdio.h>
   8 #include <stdarg.h>
   9 #include <errno.h>
  10 #include <string.h>
  11 #include <inttypes.h>
  12 #include <ctype.h>
  13 #include <termios.h>
  14
  15 #include <netinet/in.h>
  16
  17 #include <rte_string_fns.h>
  18
  19 #include "cmdline_rdline.h"
  20 #include "cmdline_parse.h"
  21 #include "cmdline.h"
  22
  23 #ifdef RTE_LIBRTE_CMDLINE_DEBUG
  24 #define debug_printf printf
  25 #else
  26 #define debug_printf(args...) do {} while(0)
  27 #endif
  28
  29 #define CMDLINE_BUFFER_SIZE 64
  30
  31 /* isblank() needs _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE, so use our
  32  * own. */
  33 static int
  34 isblank2(char c)
  35 {
  36         if (c == ' ' ||
  37             c == '\t' )
  38                 return 1;
  39         return 0;
  40 }
  41
  42 static int
  43 isendofline(char c)
  44 {
  45         if (c == '\n' ||
  46             c == '\r' )
  47                 return 1;
  48         return 0;
  49 }
  50
  51 static int
  52 iscomment(char c)
  53 {
  54         if (c == '#')
  55                 return 1;
  56         return 0;
  57 }
  58
  59 int
  60 cmdline_isendoftoken(char c)
  61 {
  62         if (!c || iscomment(c) || isblank2(c) || isendofline(c))
  63                 return 1;
  64         return 0;
  65 }
  66
  67 int
  68 cmdline_isendofcommand(char c)
  69 {
  70         if (!c || iscomment(c) || isendofline(c))
  71                 return 1;
  72         return 0;
  73 }
  74
  75 static unsigned int
  76 nb_common_chars(const char * s1, const char * s2)
  77 {
  78         unsigned int i=0;
  79
  80         while (*s1==*s2 && *s1) {
  81                 s1++;
  82                 s2++;
  83                 i++;
  84         }
  85         return i;
  86 }
  87
  88 /** Retrieve either static or dynamic token at a given index. */
  89 static cmdline_parse_token_hdr_t *
  90 get_token(cmdline_parse_inst_t *inst, unsigned int index)
  91 {
  92         cmdline_parse_token_hdr_t *token_p;
  93
  94         /* check presence of static tokens first */
  95         if (inst->tokens[0] || !inst->f)
  96                 return inst->tokens[index];
  97         /* generate dynamic token */
  98         token_p = NULL;
  99         inst->f(&token_p, NULL, &inst->tokens[index]);
 100         return token_p;
 101 }
 102
 103 /**
 104  * try to match the buffer with an instruction (only the first
 105  * nb_match_token tokens if != 0). Return 0 if we match all the
 106  * tokens, else the number of matched tokens, else -1.
 107  */
 108 static int
 109 match_inst(cmdline_parse_inst_t *inst, const char *buf,
 110            unsigned int nb_match_token, void *resbuf, unsigned resbuf_size)
 111 {
 112         cmdline_parse_token_hdr_t *token_p = NULL;
 113         unsigned int i=0;
 114         int n = 0;
 115         struct cmdline_token_hdr token_hdr;
 116
 117         if (resbuf != NULL)
 118                 memset(resbuf, 0, resbuf_size);
 119         /* check if we match all tokens of inst */
 120         while (!nb_match_token || i < nb_match_token) {
 121                 token_p = get_token(inst, i);
 122                 if (!token_p)
 123                         break;
 124                 memcpy(&token_hdr, token_p, sizeof(token_hdr));
 125
 126                 debug_printf("TK\n");
 127                 /* skip spaces */
 128                 while (isblank2(*buf)) {
 129                         buf++;
 130                 }
 131
 132                 /* end of buf */
 133                 if ( isendofline(*buf) || iscomment(*buf) )
 134                         break;
 135
 136                 if (resbuf == NULL) {
 137                         n = token_hdr.ops->parse(token_p, buf, NULL, 0);
 138                 } else {
 139                         unsigned rb_sz;
 140
 141                         if (token_hdr.offset > resbuf_size) {
 142                                 printf("Parse error(%s:%d): Token offset(%u) "
 143                                         "exceeds maximum size(%u)\n",
 144                                         __FILE__, __LINE__,
 145                                         token_hdr.offset, resbuf_size);
 146                                 return -ENOBUFS;
 147                         }
 148                         rb_sz = resbuf_size - token_hdr.offset;
 149
 150                         n = token_hdr.ops->parse(token_p, buf, (char *)resbuf +
 151                                 token_hdr.offset, rb_sz);
 152                 }
 153
 154                 if (n < 0)
 155                         break;
 156
 157                 debug_printf("TK parsed (len=%d)\n", n);
 158                 i++;
 159                 buf += n;
 160         }
 161
 162         /* does not match */
 163         if (i==0)
 164                 return -1;
 165
 166         /* in case we want to match a specific num of token */
 167         if (nb_match_token) {
 168                 if (i == nb_match_token) {
 169                         return 0;
 170                 }
 171                 return i;
 172         }
 173
 174         /* we don't match all the tokens */
 175         if (token_p) {
 176                 return i;
 177         }
 178
 179         /* are there are some tokens more */
 180         while (isblank2(*buf)) {
 181                 buf++;
 182         }
 183
 184         /* end of buf */
 185         if ( isendofline(*buf) || iscomment(*buf) )
 186                 return 0;
 187
 188         /* garbage after inst */
 189         return i;
 190 }
 191
 192
 193 int
 194 cmdline_parse(struct cmdline *cl, const char * buf)
 195 {
 196         unsigned int inst_num=0;
 197         cmdline_parse_inst_t *inst;
 198         const char *curbuf;
 199         union {
 200                 char buf[CMDLINE_PARSE_RESULT_BUFSIZE];
 201                 long double align; /* strong alignment constraint for buf */
 202         } result, tmp_result;
 203         void (*f)(void *, struct cmdline *, void *) = NULL;
 204         void *data = NULL;
 205         int comment = 0;
 206         int linelen = 0;
 207         int parse_it = 0;
 208         int err = CMDLINE_PARSE_NOMATCH;
 209         int tok;
 210         cmdline_parse_ctx_t *ctx;
 211 #ifdef RTE_LIBRTE_CMDLINE_DEBUG
 212         char debug_buf[BUFSIZ];
 213 #endif
 214         char *result_buf = result.buf;
 215
 216         if (!cl || !buf)
 217                 return CMDLINE_PARSE_BAD_ARGS;
 218
 219         ctx = cl->ctx;
 220
 221         /*
 222          * - look if the buffer contains at least one line
 223          * - look if line contains only spaces or comments
 224          * - count line length
 225          */
 226         curbuf = buf;
 227         while (! isendofline(*curbuf)) {
 228                 if ( *curbuf == '\0' ) {
 229                         debug_printf("Incomplete buf (len=%d)\n", linelen);
 230                         return 0;
 231                 }
 232                 if ( iscomment(*curbuf) ) {
 233                         comment = 1;
 234                 }
 235                 if ( ! isblank2(*curbuf) && ! comment) {
 236                         parse_it = 1;
 237                 }
 238                 curbuf++;
 239                 linelen++;
 240         }
 241
 242         /* skip all endofline chars */
 243         while (isendofline(buf[linelen])) {
 244                 linelen++;
 245         }
 246
 247         /* empty line */
 248         if ( parse_it == 0 ) {
 249                 debug_printf("Empty line (len=%d)\n", linelen);
 250                 return linelen;
 251         }
 252
 253 #ifdef RTE_LIBRTE_CMDLINE_DEBUG
 254         strlcpy(debug_buf, buf, (linelen > 64 ? 64 : linelen));
 255         debug_printf("Parse line : len=%d, <%s>\n", linelen, debug_buf);
 256 #endif
 257
 258         /* parse it !! */
 259         inst = ctx[inst_num];
 260         while (inst) {
 261                 debug_printf("INST %d\n", inst_num);
 262
 263                 /* fully parsed */
 264                 tok = match_inst(inst, buf, 0, result_buf,
 265                                  CMDLINE_PARSE_RESULT_BUFSIZE);
 266
 267                 if (tok > 0) /* we matched at least one token */
 268                         err = CMDLINE_PARSE_BAD_ARGS;
 269
 270                 else if (!tok) {
 271                         debug_printf("INST fully parsed\n");
 272                         /* skip spaces */
 273                         while (isblank2(*curbuf)) {
 274                                 curbuf++;
 275                         }
 276
 277                         /* if end of buf -> there is no garbage after inst */
 278                         if (isendofline(*curbuf) || iscomment(*curbuf)) {
 279                                 if (!f) {
 280                                         memcpy(&f, &inst->f, sizeof(f));
 281                                         memcpy(&data, &inst->data, sizeof(data));
 282                                         result_buf = tmp_result.buf;
 283                                 }
 284                                 else {
 285                                         /* more than 1 inst matches */
 286                                         err = CMDLINE_PARSE_AMBIGUOUS;
 287                                         f=NULL;
 288                                         debug_printf("Ambiguous cmd\n");
 289                                         break;
 290                                 }
 291                         }
 292                 }
 293
 294                 inst_num ++;
 295                 inst = ctx[inst_num];
 296         }
 297
 298         /* call func */
 299         if (f) {
 300                 f(result.buf, cl, data);
 301         }
 302
 303         /* no match */
 304         else {
 305                 debug_printf("No match err=%d\n", err);
 306                 return err;
 307         }
 308
 309         return linelen;
 310 }
 311
 312 int
 313 cmdline_complete(struct cmdline *cl, const char *buf, int *state,
 314                  char *dst, unsigned int size)
 315 {
 316         const char *partial_tok = buf;
 317         unsigned int inst_num = 0;
 318         cmdline_parse_inst_t *inst;
 319         cmdline_parse_token_hdr_t *token_p;
 320         struct cmdline_token_hdr token_hdr;
 321         char tmpbuf[CMDLINE_BUFFER_SIZE], comp_buf[CMDLINE_BUFFER_SIZE];
 322         unsigned int partial_tok_len;
 323         int comp_len = -1;
 324         int tmp_len = -1;
 325         int nb_token = 0;
 326         unsigned int i, n;
 327         int l;
 328         unsigned int nb_completable;
 329         unsigned int nb_non_completable;
 330         int local_state = 0;
 331         const char *help_str;
 332         cmdline_parse_ctx_t *ctx;
 333
 334         if (!cl || !buf || !state || !dst)
 335                 return -1;
 336
 337         ctx = cl->ctx;
 338
 339         debug_printf("%s called\n", __func__);
 340         memset(&token_hdr, 0, sizeof(token_hdr));
 341
 342         /* count the number of complete token to parse */
 343         for (i=0 ; buf[i] ; i++) {
 344                 if (!isblank2(buf[i]) && isblank2(buf[i+1]))
 345                         nb_token++;
 346                 if (isblank2(buf[i]) && !isblank2(buf[i+1]))
 347                         partial_tok = buf+i+1;
 348         }
 349         partial_tok_len = strnlen(partial_tok, RDLINE_BUF_SIZE);
 350
 351         /* first call -> do a first pass */
 352         if (*state <= 0) {
 353                 debug_printf("try complete <%s>\n", buf);
 354                 debug_printf("there is %d complete tokens, <%s> is incomplete\n",
 355                              nb_token, partial_tok);
 356
 357                 nb_completable = 0;
 358                 nb_non_completable = 0;
 359
 360                 inst = ctx[inst_num];
 361                 while (inst) {
 362                         /* parse the first tokens of the inst */
 363                         if (nb_token &&
 364                             match_inst(inst, buf, nb_token, NULL, 0))
 365                                 goto next;
 366
 367                         debug_printf("instruction match\n");
 368                         token_p = get_token(inst, nb_token);
 369                         if (token_p)
 370                                 memcpy(&token_hdr, token_p, sizeof(token_hdr));
 371
 372                         /* non completable */
 373                         if (!token_p ||
 374                             !token_hdr.ops->complete_get_nb ||
 375                             !token_hdr.ops->complete_get_elt ||
 376                             (n = token_hdr.ops->complete_get_nb(token_p)) == 0) {
 377                                 nb_non_completable++;
 378                                 goto next;
 379                         }
 380
 381                         debug_printf("%d choices for this token\n", n);
 382                         for (i=0 ; i<n ; i++) {
 383                                 if (token_hdr.ops->complete_get_elt(token_p, i,
 384                                                                     tmpbuf,
 385                                                                     sizeof(tmpbuf)) < 0)
 386                                         continue;
 387
 388                                 /* we have at least room for one char */
 389                                 tmp_len = strnlen(tmpbuf, sizeof(tmpbuf));
 390                                 if (tmp_len < CMDLINE_BUFFER_SIZE - 1) {
 391                                         tmpbuf[tmp_len] = ' ';
 392                                         tmpbuf[tmp_len+1] = 0;
 393                                 }
 394
 395                                 debug_printf("   choice <%s>\n", tmpbuf);
 396
 397                                 /* does the completion match the
 398                                  * beginning of the word ? */
 399                                 if (!strncmp(partial_tok, tmpbuf,
 400                                              partial_tok_len)) {
 401                                         if (comp_len == -1) {
 402                                                 snprintf(comp_buf, sizeof(comp_buf),
 403                                                          "%s", tmpbuf + partial_tok_len);
 404                                                 comp_len =
 405                                                         strnlen(tmpbuf + partial_tok_len,
 406                                                                         sizeof(tmpbuf) - partial_tok_len);
 407
 408                                         }
 409                                         else {
 410                                                 comp_len =
 411                                                         nb_common_chars(comp_buf,
 412                                                                         tmpbuf+partial_tok_len);
 413                                                 comp_buf[comp_len] = 0;
 414                                         }
 415                                         nb_completable++;
 416                                 }
 417                         }
 418                 next:
 419                         debug_printf("next\n");
 420                         inst_num ++;
 421                         inst = ctx[inst_num];
 422                 }
 423
 424                 debug_printf("total choices %d for this completion\n",
 425                              nb_completable);
 426
 427                 /* no possible completion */
 428                 if (nb_completable == 0 && nb_non_completable == 0)
 429                         return 0;
 430
 431                 /* if multichoice is not required */
 432                 if (*state == 0 && partial_tok_len > 0) {
 433                         /* one or several choices starting with the
 434                            same chars */
 435                         if (comp_len > 0) {
 436                                 if ((unsigned)(comp_len + 1) > size)
 437                                         return 0;
 438
 439                                 strlcpy(dst, comp_buf, size);
 440                                 dst[comp_len] = 0;
 441                                 return 2;
 442                         }
 443                 }
 444         }
 445
 446         /* init state correctly */
 447         if (*state == -1)
 448                 *state = 0;
 449
 450         debug_printf("Multiple choice STATE=%d\n", *state);
 451
 452         inst_num = 0;
 453         inst = ctx[inst_num];
 454         while (inst) {
 455                 /* we need to redo it */
 456                 inst = ctx[inst_num];
 457
 458                 if (nb_token &&
 459                     match_inst(inst, buf, nb_token, NULL, 0))
 460                         goto next2;
 461
 462                 token_p = get_token(inst, nb_token);
 463                 if (token_p)
 464                         memcpy(&token_hdr, token_p, sizeof(token_hdr));
 465
 466                 /* one choice for this token */
 467                 if (!token_p ||
 468                     !token_hdr.ops->complete_get_nb ||
 469                     !token_hdr.ops->complete_get_elt ||
 470                     (n = token_hdr.ops->complete_get_nb(token_p)) == 0) {
 471                         if (local_state < *state) {
 472                                 local_state++;
 473                                 goto next2;
 474                         }
 475                         (*state)++;
 476                         if (token_p && token_hdr.ops->get_help) {
 477                                 token_hdr.ops->get_help(token_p, tmpbuf,
 478                                                         sizeof(tmpbuf));
 479                                 help_str = inst->help_str;
 480                                 if (help_str)
 481                                         snprintf(dst, size, "[%s]: %s", tmpbuf,
 482                                                  help_str);
 483                                 else
 484                                         snprintf(dst, size, "[%s]: No help",
 485                                                  tmpbuf);
 486                         }
 487                         else {
 488                                 snprintf(dst, size, "[RETURN]");
 489                         }
 490                         return 1;
 491                 }
 492
 493                 /* several choices */
 494                 for (i=0 ; i<n ; i++) {
 495                         if (token_hdr.ops->complete_get_elt(token_p, i, tmpbuf,
 496                                                             sizeof(tmpbuf)) < 0)
 497                                 continue;
 498                         /* we have at least room for one char */
 499                         tmp_len = strnlen(tmpbuf, sizeof(tmpbuf));
 500                         if (tmp_len < CMDLINE_BUFFER_SIZE - 1) {
 501                                 tmpbuf[tmp_len] = ' ';
 502                                 tmpbuf[tmp_len + 1] = 0;
 503                         }
 504
 505                         debug_printf("   choice <%s>\n", tmpbuf);
 506
 507                         /* does the completion match the beginning of
 508                          * the word ? */
 509                         if (!strncmp(partial_tok, tmpbuf,
 510                                      partial_tok_len)) {
 511                                 if (local_state < *state) {
 512                                         local_state++;
 513                                         continue;
 514                                 }
 515                                 (*state)++;
 516                                 l=strlcpy(dst, tmpbuf, size);
 517                                 if (l>=0 && token_hdr.ops->get_help) {
 518                                         token_hdr.ops->get_help(token_p, tmpbuf,
 519                                                                 sizeof(tmpbuf));
 520                                         help_str = inst->help_str;
 521                                         if (help_str)
 522                                                 snprintf(dst+l, size-l, "[%s]: %s",
 523                                                          tmpbuf, help_str);
 524                                         else
 525                                                 snprintf(dst+l, size-l,
 526                                                          "[%s]: No help", tmpbuf);
 527                                 }
 528
 529                                 return 1;
 530                         }
 531                 }
 532         next2:
 533                 inst_num ++;
 534                 inst = ctx[inst_num];
 535         }
 536         return 0;
 537 }