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         char *result_buf = result.buf;
 212
 213         if (!cl || !buf)
 214                 return CMDLINE_PARSE_BAD_ARGS;
 215
 216         ctx = cl->ctx;
 217
 218         /*
 219          * - look if the buffer contains at least one line
 220          * - look if line contains only spaces or comments
 221          * - count line length
 222          */
 223         curbuf = buf;
 224         while (! isendofline(*curbuf)) {
 225                 if ( *curbuf == '\0' ) {
 226                         debug_printf("Incomplete buf (len=%d)\n", linelen);
 227                         return 0;
 228                 }
 229                 if ( iscomment(*curbuf) ) {
 230                         comment = 1;
 231                 }
 232                 if ( ! isblank2(*curbuf) && ! comment) {
 233                         parse_it = 1;
 234                 }
 235                 curbuf++;
 236                 linelen++;
 237         }
 238
 239         /* skip all endofline chars */
 240         while (isendofline(buf[linelen])) {
 241                 linelen++;
 242         }
 243
 244         /* empty line */
 245         if ( parse_it == 0 ) {
 246                 debug_printf("Empty line (len=%d)\n", linelen);
 247                 return linelen;
 248         }
 249
 250         debug_printf("Parse line : len=%d, <%.*s>\n",
 251                      linelen, linelen > 64 ? 64 : linelen, buf);
 252
 253         /* parse it !! */
 254         inst = ctx[inst_num];
 255         while (inst) {
 256                 debug_printf("INST %d\n", inst_num);
 257
 258                 /* fully parsed */
 259                 tok = match_inst(inst, buf, 0, result_buf,
 260                                  CMDLINE_PARSE_RESULT_BUFSIZE);
 261
 262                 if (tok > 0) /* we matched at least one token */
 263                         err = CMDLINE_PARSE_BAD_ARGS;
 264
 265                 else if (!tok) {
 266                         debug_printf("INST fully parsed\n");
 267                         /* skip spaces */
 268                         while (isblank2(*curbuf)) {
 269                                 curbuf++;
 270                         }
 271
 272                         /* if end of buf -> there is no garbage after inst */
 273                         if (isendofline(*curbuf) || iscomment(*curbuf)) {
 274                                 if (!f) {
 275                                         memcpy(&f, &inst->f, sizeof(f));
 276                                         memcpy(&data, &inst->data, sizeof(data));
 277                                         result_buf = tmp_result.buf;
 278                                 }
 279                                 else {
 280                                         /* more than 1 inst matches */
 281                                         err = CMDLINE_PARSE_AMBIGUOUS;
 282                                         f=NULL;
 283                                         debug_printf("Ambiguous cmd\n");
 284                                         break;
 285                                 }
 286                         }
 287                 }
 288
 289                 inst_num ++;
 290                 inst = ctx[inst_num];
 291         }
 292
 293         /* call func */
 294         if (f) {
 295                 f(result.buf, cl, data);
 296         }
 297
 298         /* no match */
 299         else {
 300                 debug_printf("No match err=%d\n", err);
 301                 return err;
 302         }
 303
 304         return linelen;
 305 }
 306
 307 int
 308 cmdline_complete(struct cmdline *cl, const char *buf, int *state,
 309                  char *dst, unsigned int size)
 310 {
 311         const char *partial_tok = buf;
 312         unsigned int inst_num = 0;
 313         cmdline_parse_inst_t *inst;
 314         cmdline_parse_token_hdr_t *token_p;
 315         struct cmdline_token_hdr token_hdr;
 316         char tmpbuf[CMDLINE_BUFFER_SIZE], comp_buf[CMDLINE_BUFFER_SIZE];
 317         unsigned int partial_tok_len;
 318         int comp_len = -1;
 319         int tmp_len = -1;
 320         int nb_token = 0;
 321         unsigned int i, n;
 322         int l;
 323         unsigned int nb_completable;
 324         unsigned int nb_non_completable;
 325         int local_state = 0;
 326         const char *help_str;
 327         cmdline_parse_ctx_t *ctx;
 328
 329         if (!cl || !buf || !state || !dst)
 330                 return -1;
 331
 332         ctx = cl->ctx;
 333
 334         debug_printf("%s called\n", __func__);
 335         memset(&token_hdr, 0, sizeof(token_hdr));
 336
 337         /* count the number of complete token to parse */
 338         for (i=0 ; buf[i] ; i++) {
 339                 if (!isblank2(buf[i]) && isblank2(buf[i+1]))
 340                         nb_token++;
 341                 if (isblank2(buf[i]) && !isblank2(buf[i+1]))
 342                         partial_tok = buf+i+1;
 343         }
 344         partial_tok_len = strnlen(partial_tok, RDLINE_BUF_SIZE);
 345
 346         /* first call -> do a first pass */
 347         if (*state <= 0) {
 348                 debug_printf("try complete <%s>\n", buf);
 349                 debug_printf("there is %d complete tokens, <%s> is incomplete\n",
 350                              nb_token, partial_tok);
 351
 352                 nb_completable = 0;
 353                 nb_non_completable = 0;
 354
 355                 inst = ctx[inst_num];
 356                 while (inst) {
 357                         /* parse the first tokens of the inst */
 358                         if (nb_token &&
 359                             match_inst(inst, buf, nb_token, NULL, 0))
 360                                 goto next;
 361
 362                         debug_printf("instruction match\n");
 363                         token_p = get_token(inst, nb_token);
 364                         if (token_p)
 365                                 memcpy(&token_hdr, token_p, sizeof(token_hdr));
 366
 367                         /* non completable */
 368                         if (!token_p ||
 369                             !token_hdr.ops->complete_get_nb ||
 370                             !token_hdr.ops->complete_get_elt ||
 371                             (n = token_hdr.ops->complete_get_nb(token_p)) == 0) {
 372                                 nb_non_completable++;
 373                                 goto next;
 374                         }
 375
 376                         debug_printf("%d choices for this token\n", n);
 377                         for (i=0 ; i<n ; i++) {
 378                                 if (token_hdr.ops->complete_get_elt(token_p, i,
 379                                                                     tmpbuf,
 380                                                                     sizeof(tmpbuf)) < 0)
 381                                         continue;
 382
 383                                 /* we have at least room for one char */
 384                                 tmp_len = strnlen(tmpbuf, sizeof(tmpbuf));
 385                                 if (tmp_len < CMDLINE_BUFFER_SIZE - 1) {
 386                                         tmpbuf[tmp_len] = ' ';
 387                                         tmpbuf[tmp_len+1] = 0;
 388                                 }
 389
 390                                 debug_printf("   choice <%s>\n", tmpbuf);
 391
 392                                 /* does the completion match the
 393                                  * beginning of the word ? */
 394                                 if (!strncmp(partial_tok, tmpbuf,
 395                                              partial_tok_len)) {
 396                                         if (comp_len == -1) {
 397                                                 strlcpy(comp_buf,
 398                                                         tmpbuf + partial_tok_len,
 399                                                         sizeof(comp_buf));
 400                                                 comp_len =
 401                                                         strnlen(tmpbuf + partial_tok_len,
 402                                                                         sizeof(tmpbuf) - partial_tok_len);
 403
 404                                         }
 405                                         else {
 406                                                 comp_len =
 407                                                         nb_common_chars(comp_buf,
 408                                                                         tmpbuf+partial_tok_len);
 409                                                 comp_buf[comp_len] = 0;
 410                                         }
 411                                         nb_completable++;
 412                                 }
 413                         }
 414                 next:
 415                         debug_printf("next\n");
 416                         inst_num ++;
 417                         inst = ctx[inst_num];
 418                 }
 419
 420                 debug_printf("total choices %d for this completion\n",
 421                              nb_completable);
 422
 423                 /* no possible completion */
 424                 if (nb_completable == 0 && nb_non_completable == 0)
 425                         return 0;
 426
 427                 /* if multichoice is not required */
 428                 if (*state == 0 && partial_tok_len > 0) {
 429                         /* one or several choices starting with the
 430                            same chars */
 431                         if (comp_len > 0) {
 432                                 if ((unsigned)(comp_len + 1) > size)
 433                                         return 0;
 434
 435                                 strlcpy(dst, comp_buf, size);
 436                                 dst[comp_len] = 0;
 437                                 return 2;
 438                         }
 439                 }
 440         }
 441
 442         /* init state correctly */
 443         if (*state == -1)
 444                 *state = 0;
 445
 446         debug_printf("Multiple choice STATE=%d\n", *state);
 447
 448         inst_num = 0;
 449         inst = ctx[inst_num];
 450         while (inst) {
 451                 /* we need to redo it */
 452                 inst = ctx[inst_num];
 453
 454                 if (nb_token &&
 455                     match_inst(inst, buf, nb_token, NULL, 0))
 456                         goto next2;
 457
 458                 token_p = get_token(inst, nb_token);
 459                 if (token_p)
 460                         memcpy(&token_hdr, token_p, sizeof(token_hdr));
 461
 462                 /* one choice for this token */
 463                 if (!token_p ||
 464                     !token_hdr.ops->complete_get_nb ||
 465                     !token_hdr.ops->complete_get_elt ||
 466                     (n = token_hdr.ops->complete_get_nb(token_p)) == 0) {
 467                         if (local_state < *state) {
 468                                 local_state++;
 469                                 goto next2;
 470                         }
 471                         (*state)++;
 472                         if (token_p && token_hdr.ops->get_help) {
 473                                 token_hdr.ops->get_help(token_p, tmpbuf,
 474                                                         sizeof(tmpbuf));
 475                                 help_str = inst->help_str;
 476                                 if (help_str)
 477                                         snprintf(dst, size, "[%s]: %s", tmpbuf,
 478                                                  help_str);
 479                                 else
 480                                         snprintf(dst, size, "[%s]: No help",
 481                                                  tmpbuf);
 482                         }
 483                         else {
 484                                 snprintf(dst, size, "[RETURN]");
 485                         }
 486                         return 1;
 487                 }
 488
 489                 /* several choices */
 490                 for (i=0 ; i<n ; i++) {
 491                         if (token_hdr.ops->complete_get_elt(token_p, i, tmpbuf,
 492                                                             sizeof(tmpbuf)) < 0)
 493                                 continue;
 494                         /* we have at least room for one char */
 495                         tmp_len = strnlen(tmpbuf, sizeof(tmpbuf));
 496                         if (tmp_len < CMDLINE_BUFFER_SIZE - 1) {
 497                                 tmpbuf[tmp_len] = ' ';
 498                                 tmpbuf[tmp_len + 1] = 0;
 499                         }
 500
 501                         debug_printf("   choice <%s>\n", tmpbuf);
 502
 503                         /* does the completion match the beginning of
 504                          * the word ? */
 505                         if (!strncmp(partial_tok, tmpbuf,
 506                                      partial_tok_len)) {
 507                                 if (local_state < *state) {
 508                                         local_state++;
 509                                         continue;
 510                                 }
 511                                 (*state)++;
 512                                 l=strlcpy(dst, tmpbuf, size);
 513                                 if (l>=0 && token_hdr.ops->get_help) {
 514                                         token_hdr.ops->get_help(token_p, tmpbuf,
 515                                                                 sizeof(tmpbuf));
 516                                         help_str = inst->help_str;
 517                                         if (help_str)
 518                                                 snprintf(dst+l, size-l, "[%s]: %s",
 519                                                          tmpbuf, help_str);
 520                                         else
 521                                                 snprintf(dst+l, size-l,
 522                                                          "[%s]: No help", tmpbuf);
 523                                 }
 524
 525                                 return 1;
 526                         }
 527                 }
 528         next2:
 529                 inst_num ++;
 530                 inst = ctx[inst_num];
 531         }
 532         return 0;
 533 }