help.c

   1 /*
   2  * builtin-help.c
   3  *
   4  * Builtin help-related commands (help, usage, version)
   5  */
   6 #include "cache.h"
   7 #include "builtin.h"
   8 #include "exec_cmd.h"
   9 #include "common-cmds.h"
  10 #include "parse-options.h"
  11 #include "run-command.h"
  12 #include "help.h"
  13
  14 static struct man_viewer_list {
  15         struct man_viewer_list *next;
  16         char name[FLEX_ARRAY];
  17 } *man_viewer_list;
  18
  19 static struct man_viewer_info_list {
  20         struct man_viewer_info_list *next;
  21         const char *info;
  22         char name[FLEX_ARRAY];
  23 } *man_viewer_info_list;
  24
  25 enum help_format {
  26         HELP_FORMAT_MAN,
  27         HELP_FORMAT_INFO,
  28         HELP_FORMAT_WEB,
  29 };
  30
  31 static int show_all = 0;
  32 static enum help_format help_format = HELP_FORMAT_MAN;
  33 static struct option builtin_help_options[] = {
  34         OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
  35         OPT_SET_INT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
  36         OPT_SET_INT('w', "web", &help_format, "show manual in web browser",
  37                         HELP_FORMAT_WEB),
  38         OPT_SET_INT('i', "info", &help_format, "show info page",
  39                         HELP_FORMAT_INFO),
  40         OPT_END(),
  41 };
  42
  43 static const char * const builtin_help_usage[] = {
  44         "git help [--all] [--man|--web|--info] [command]",
  45         NULL
  46 };
  47
  48 static enum help_format parse_help_format(const char *format)
  49 {
  50         if (!strcmp(format, "man"))
  51                 return HELP_FORMAT_MAN;
  52         if (!strcmp(format, "info"))
  53                 return HELP_FORMAT_INFO;
  54         if (!strcmp(format, "web") || !strcmp(format, "html"))
  55                 return HELP_FORMAT_WEB;
  56         die("unrecognized help format '%s'", format);
  57 }
  58
  59 static const char *get_man_viewer_info(const char *name)
  60 {
  61         struct man_viewer_info_list *viewer;
  62
  63         for (viewer = man_viewer_info_list; viewer; viewer = viewer->next)
  64         {
  65                 if (!strcasecmp(name, viewer->name))
  66                         return viewer->info;
  67         }
  68         return NULL;
  69 }
  70
  71 static int check_emacsclient_version(void)
  72 {
  73         struct strbuf buffer = STRBUF_INIT;
  74         struct child_process ec_process;
  75         const char *argv_ec[] = { "emacsclient", "--version", NULL };
  76         int version;
  77
  78         /* emacsclient prints its version number on stderr */
  79         memset(&ec_process, 0, sizeof(ec_process));
  80         ec_process.argv = argv_ec;
  81         ec_process.err = -1;
  82         ec_process.stdout_to_stderr = 1;
  83         if (start_command(&ec_process)) {
  84                 fprintf(stderr, "Failed to start emacsclient.\n");
  85                 return -1;
  86         }
  87         strbuf_read(&buffer, ec_process.err, 20);
  88         close(ec_process.err);
  89
  90         /*
  91          * Don't bother checking return value, because "emacsclient --version"
  92          * seems to always exits with code 1.
  93          */
  94         finish_command(&ec_process);
  95
  96         if (prefixcmp(buffer.buf, "emacsclient")) {
  97                 fprintf(stderr, "Failed to parse emacsclient version.\n");
  98                 strbuf_release(&buffer);
  99                 return -1;
 100         }
 101
 102         strbuf_remove(&buffer, 0, strlen("emacsclient"));
 103         version = atoi(buffer.buf);
 104
 105         if (version < 22) {
 106                 fprintf(stderr,
 107                         "emacsclient version '%d' too old (< 22).\n",
 108                         version);
 109                 strbuf_release(&buffer);
 110                 return -1;
 111         }
 112
 113         strbuf_release(&buffer);
 114         return 0;
 115 }
 116
 117 static void exec_woman_emacs(const char* path, const char *page)
 118 {
 119         if (!check_emacsclient_version()) {
 120                 /* This works only with emacsclient version >= 22. */
 121                 struct strbuf man_page = STRBUF_INIT;
 122
 123                 if (!path)
 124                         path = "emacsclient";
 125                 strbuf_addf(&man_page, "(woman \"%s\")", page);
 126                 execlp(path, "emacsclient", "-e", man_page.buf, NULL);
 127                 warning("failed to exec '%s': %s", path, strerror(errno));
 128         }
 129 }
 130
 131 static void exec_man_konqueror(const char* path, const char *page)
 132 {
 133         const char *display = getenv("DISPLAY");
 134         if (display && *display) {
 135                 struct strbuf man_page = STRBUF_INIT;
 136                 const char *filename = "kfmclient";
 137
 138                 /* It's simpler to launch konqueror using kfmclient. */
 139                 if (path) {
 140                         const char *file = strrchr(path, '/');
 141                         if (file && !strcmp(file + 1, "konqueror")) {
 142                                 char *new = xstrdup(path);
 143                                 char *dest = strrchr(new, '/');
 144
 145                                 /* strlen("konqueror") == strlen("kfmclient") */
 146                                 strcpy(dest + 1, "kfmclient");
 147                                 path = new;
 148                         }
 149                         if (file)
 150                                 filename = file;
 151                 } else
 152                         path = "kfmclient";
 153                 strbuf_addf(&man_page, "man:%s(1)", page);
 154                 execlp(path, filename, "newTab", man_page.buf, NULL);
 155                 warning("failed to exec '%s': %s", path, strerror(errno));
 156         }
 157 }
 158
 159 static void exec_man_man(const char* path, const char *page)
 160 {
 161         if (!path)
 162                 path = "man";
 163         execlp(path, "man", page, NULL);
 164         warning("failed to exec '%s': %s", path, strerror(errno));
 165 }
 166
 167 static void exec_man_cmd(const char *cmd, const char *page)
 168 {
 169         struct strbuf shell_cmd = STRBUF_INIT;
 170         strbuf_addf(&shell_cmd, "%s %s", cmd, page);
 171         execl("/bin/sh", "sh", "-c", shell_cmd.buf, NULL);
 172         warning("failed to exec '%s': %s", cmd, strerror(errno));
 173 }
 174
 175 static void add_man_viewer(const char *name)
 176 {
 177         struct man_viewer_list **p = &man_viewer_list;
 178         size_t len = strlen(name);
 179
 180         while (*p)
 181                 p = &((*p)->next);
 182         *p = xcalloc(1, (sizeof(**p) + len + 1));
 183         strncpy((*p)->name, name, len);
 184 }
 185
 186 static int supported_man_viewer(const char *name, size_t len)
 187 {
 188         return (!strncasecmp("man", name, len) ||
 189                 !strncasecmp("woman", name, len) ||
 190                 !strncasecmp("konqueror", name, len));
 191 }
 192
 193 static void do_add_man_viewer_info(const char *name,
 194                                    size_t len,
 195                                    const char *value)
 196 {
 197         struct man_viewer_info_list *new = xcalloc(1, sizeof(*new) + len + 1);
 198
 199         strncpy(new->name, name, len);
 200         new->info = xstrdup(value);
 201         new->next = man_viewer_info_list;
 202         man_viewer_info_list = new;
 203 }
 204
 205 static int add_man_viewer_path(const char *name,
 206                                size_t len,
 207                                const char *value)
 208 {
 209         if (supported_man_viewer(name, len))
 210                 do_add_man_viewer_info(name, len, value);
 211         else
 212                 warning("'%s': path for unsupported man viewer.\n"
 213                         "Please consider using 'man.<tool>.cmd' instead.",
 214                         name);
 215
 216         return 0;
 217 }
 218
 219 static int add_man_viewer_cmd(const char *name,
 220                               size_t len,
 221                               const char *value)
 222 {
 223         if (supported_man_viewer(name, len))
 224                 warning("'%s': cmd for supported man viewer.\n"
 225                         "Please consider using 'man.<tool>.path' instead.",
 226                         name);
 227         else
 228                 do_add_man_viewer_info(name, len, value);
 229
 230         return 0;
 231 }
 232
 233 static int add_man_viewer_info(const char *var, const char *value)
 234 {
 235         const char *name = var + 4;
 236         const char *subkey = strrchr(name, '.');
 237
 238         if (!subkey)
 239                 return error("Config with no key for man viewer: %s", name);
 240
 241         if (!strcmp(subkey, ".path")) {
 242                 if (!value)
 243                         return config_error_nonbool(var);
 244                 return add_man_viewer_path(name, subkey - name, value);
 245         }
 246         if (!strcmp(subkey, ".cmd")) {
 247                 if (!value)
 248                         return config_error_nonbool(var);
 249                 return add_man_viewer_cmd(name, subkey - name, value);
 250         }
 251
 252         warning("'%s': unsupported man viewer sub key.", subkey);
 253         return 0;
 254 }
 255
 256 static int git_help_config(const char *var, const char *value, void *cb)
 257 {
 258         if (!strcmp(var, "help.format")) {
 259                 if (!value)
 260                         return config_error_nonbool(var);
 261                 help_format = parse_help_format(value);
 262                 return 0;
 263         }
 264         if (!strcmp(var, "man.viewer")) {
 265                 if (!value)
 266                         return config_error_nonbool(var);
 267                 add_man_viewer(value);
 268                 return 0;
 269         }
 270         if (!prefixcmp(var, "man."))
 271                 return add_man_viewer_info(var, value);
 272
 273         return git_default_config(var, value, cb);
 274 }
 275
 276 /* most GUI terminals set COLUMNS (although some don't export it) */
 277 static int term_columns(void)
 278 {
 279         char *col_string = getenv("COLUMNS");
 280         int n_cols;
 281
 282         if (col_string && (n_cols = atoi(col_string)) > 0)
 283                 return n_cols;
 284
 285 #ifdef TIOCGWINSZ
 286         {
 287                 struct winsize ws;
 288                 if (!ioctl(1, TIOCGWINSZ, &ws)) {
 289                         if (ws.ws_col)
 290                                 return ws.ws_col;
 291                 }
 292         }
 293 #endif
 294
 295         return 80;
 296 }
 297
 298 static inline void mput_char(char c, unsigned int num)
 299 {
 300         while(num--)
 301                 putchar(c);
 302 }
 303
 304 struct cmdnames main_cmds, other_cmds;
 305
 306 void add_cmdname(struct cmdnames *cmds, const char *name, int len)
 307 {
 308         struct cmdname *ent = xmalloc(sizeof(*ent) + len + 1);
 309
 310         ent->len = len;
 311         memcpy(ent->name, name, len);
 312         ent->name[len] = 0;
 313
 314         ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
 315         cmds->names[cmds->cnt++] = ent;
 316 }
 317
 318 static int cmdname_compare(const void *a_, const void *b_)
 319 {
 320         struct cmdname *a = *(struct cmdname **)a_;
 321         struct cmdname *b = *(struct cmdname **)b_;
 322         return strcmp(a->name, b->name);
 323 }
 324
 325 static void uniq(struct cmdnames *cmds)
 326 {
 327         int i, j;
 328
 329         if (!cmds->cnt)
 330                 return;
 331
 332         for (i = j = 1; i < cmds->cnt; i++)
 333                 if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
 334                         cmds->names[j++] = cmds->names[i];
 335
 336         cmds->cnt = j;
 337 }
 338
 339 void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
 340 {
 341         int ci, cj, ei;
 342         int cmp;
 343
 344         ci = cj = ei = 0;
 345         while (ci < cmds->cnt && ei < excludes->cnt) {
 346                 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
 347                 if (cmp < 0)
 348                         cmds->names[cj++] = cmds->names[ci++];
 349                 else if (cmp == 0)
 350                         ci++, ei++;
 351                 else if (cmp > 0)
 352                         ei++;
 353         }
 354
 355         while (ci < cmds->cnt)
 356                 cmds->names[cj++] = cmds->names[ci++];
 357
 358         cmds->cnt = cj;
 359 }
 360
 361 static void pretty_print_string_list(struct cmdnames *cmds, int longest)
 362 {
 363         int cols = 1, rows;
 364         int space = longest + 1; /* min 1 SP between words */
 365         int max_cols = term_columns() - 1; /* don't print *on* the edge */
 366         int i, j;
 367
 368         if (space < max_cols)
 369                 cols = max_cols / space;
 370         rows = (cmds->cnt + cols - 1) / cols;
 371
 372         for (i = 0; i < rows; i++) {
 373                 printf("  ");
 374
 375                 for (j = 0; j < cols; j++) {
 376                         int n = j * rows + i;
 377                         int size = space;
 378                         if (n >= cmds->cnt)
 379                                 break;
 380                         if (j == cols-1 || n + rows >= cmds->cnt)
 381                                 size = 1;
 382                         printf("%-*s", size, cmds->names[n]->name);
 383                 }
 384                 putchar('\n');
 385         }
 386 }
 387
 388 static int is_executable(const char *name)
 389 {
 390         struct stat st;
 391
 392         if (stat(name, &st) || /* stat, not lstat */
 393             !S_ISREG(st.st_mode))
 394                 return 0;
 395
 396 #ifdef __MINGW32__
 397         /* cannot trust the executable bit, peek into the file instead */
 398         char buf[3] = { 0 };
 399         int n;
 400         int fd = open(name, O_RDONLY);
 401         st.st_mode &= ~S_IXUSR;
 402         if (fd >= 0) {
 403                 n = read(fd, buf, 2);
 404                 if (n == 2)
 405                         /* DOS executables start with "MZ" */
 406                         if (!strcmp(buf, "#!") || !strcmp(buf, "MZ"))
 407                                 st.st_mode |= S_IXUSR;
 408                 close(fd);
 409         }
 410 #endif
 411         return st.st_mode & S_IXUSR;
 412 }
 413
 414 static unsigned int list_commands_in_dir(struct cmdnames *cmds,
 415                                          const char *path,
 416                                          const char *prefix)
 417 {
 418         unsigned int longest = 0;
 419         int prefix_len;
 420         DIR *dir = opendir(path);
 421         struct dirent *de;
 422         struct strbuf buf = STRBUF_INIT;
 423         int len;
 424
 425         if (!dir)
 426                 return 0;
 427         if (!prefix)
 428                 prefix = "git-";
 429         prefix_len = strlen(prefix);
 430
 431         strbuf_addf(&buf, "%s/", path);
 432         len = buf.len;
 433
 434         while ((de = readdir(dir)) != NULL) {
 435                 int entlen;
 436
 437                 if (prefixcmp(de->d_name, prefix))
 438                         continue;
 439
 440                 strbuf_setlen(&buf, len);
 441                 strbuf_addstr(&buf, de->d_name);
 442                 if (!is_executable(buf.buf))
 443                         continue;
 444
 445                 entlen = strlen(de->d_name) - prefix_len;
 446                 if (has_extension(de->d_name, ".exe"))
 447                         entlen -= 4;
 448
 449                 if (longest < entlen)
 450                         longest = entlen;
 451
 452                 add_cmdname(cmds, de->d_name + prefix_len, entlen);
 453         }
 454         closedir(dir);
 455         strbuf_release(&buf);
 456
 457         return longest;
 458 }
 459
 460 unsigned int load_command_list(const char *prefix,
 461                 struct cmdnames *main_cmds,
 462                 struct cmdnames *other_cmds)
 463 {
 464         unsigned int longest = 0;
 465         unsigned int len;
 466         const char *env_path = getenv("PATH");
 467         char *paths, *path, *colon;
 468         const char *exec_path = git_exec_path();
 469
 470         if (exec_path)
 471                 longest = list_commands_in_dir(main_cmds, exec_path, prefix);
 472
 473         if (!env_path) {
 474                 fprintf(stderr, "PATH not set\n");
 475                 exit(1);
 476         }
 477
 478         path = paths = xstrdup(env_path);
 479         while (1) {
 480                 if ((colon = strchr(path, PATH_SEP)))
 481                         *colon = 0;
 482
 483                 len = list_commands_in_dir(other_cmds, path, prefix);
 484                 if (len > longest)
 485                         longest = len;
 486
 487                 if (!colon)
 488                         break;
 489                 path = colon + 1;
 490         }
 491         free(paths);
 492
 493         qsort(main_cmds->names, main_cmds->cnt,
 494               sizeof(*main_cmds->names), cmdname_compare);
 495         uniq(main_cmds);
 496
 497         qsort(other_cmds->names, other_cmds->cnt,
 498               sizeof(*other_cmds->names), cmdname_compare);
 499         uniq(other_cmds);
 500         exclude_cmds(other_cmds, main_cmds);
 501
 502         return longest;
 503 }
 504
 505 void list_commands(const char *title, unsigned int longest,
 506                 struct cmdnames *main_cmds, struct cmdnames *other_cmds)
 507 {
 508         const char *exec_path = git_exec_path();
 509
 510         if (main_cmds->cnt) {
 511                 printf("available %s in '%s'\n", title, exec_path);
 512                 printf("----------------");
 513                 mput_char('-', strlen(title) + strlen(exec_path));
 514                 putchar('\n');
 515                 pretty_print_string_list(main_cmds, longest);
 516                 putchar('\n');
 517         }
 518
 519         if (other_cmds->cnt) {
 520                 printf("%s available from elsewhere on your $PATH\n", title);
 521                 printf("---------------------------------------");
 522                 mput_char('-', strlen(title));
 523                 putchar('\n');
 524                 pretty_print_string_list(other_cmds, longest);
 525                 putchar('\n');
 526         }
 527 }
 528
 529 void list_common_cmds_help(void)
 530 {
 531         int i, longest = 0;
 532
 533         for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
 534                 if (longest < strlen(common_cmds[i].name))
 535                         longest = strlen(common_cmds[i].name);
 536         }
 537
 538         puts("The most commonly used git commands are:");
 539         for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
 540                 printf("   %s   ", common_cmds[i].name);
 541                 mput_char(' ', longest - strlen(common_cmds[i].name));
 542                 puts(common_cmds[i].help);
 543         }
 544 }
 545
 546 int is_in_cmdlist(struct cmdnames *c, const char *s)
 547 {
 548         int i;
 549         for (i = 0; i < c->cnt; i++)
 550                 if (!strcmp(s, c->names[i]->name))
 551                         return 1;
 552         return 0;
 553 }
 554
 555 static int is_git_command(const char *s)
 556 {
 557         return is_in_cmdlist(&main_cmds, s) ||
 558                 is_in_cmdlist(&other_cmds, s);
 559 }
 560
 561 static const char *prepend(const char *prefix, const char *cmd)
 562 {
 563         size_t pre_len = strlen(prefix);
 564         size_t cmd_len = strlen(cmd);
 565         char *p = xmalloc(pre_len + cmd_len + 1);
 566         memcpy(p, prefix, pre_len);
 567         strcpy(p + pre_len, cmd);
 568         return p;
 569 }
 570
 571 static const char *cmd_to_page(const char *git_cmd)
 572 {
 573         if (!git_cmd)
 574                 return "git";
 575         else if (!prefixcmp(git_cmd, "git"))
 576                 return git_cmd;
 577         else if (is_git_command(git_cmd))
 578                 return prepend("git-", git_cmd);
 579         else
 580                 return prepend("git", git_cmd);
 581 }
 582
 583 static void setup_man_path(void)
 584 {
 585         struct strbuf new_path;
 586         const char *old_path = getenv("MANPATH");
 587
 588         strbuf_init(&new_path, 0);
 589
 590         /* We should always put ':' after our path. If there is no
 591          * old_path, the ':' at the end will let 'man' to try
 592          * system-wide paths after ours to find the manual page. If
 593          * there is old_path, we need ':' as delimiter. */
 594         strbuf_addstr(&new_path, GIT_MAN_PATH);
 595         strbuf_addch(&new_path, ':');
 596         if (old_path)
 597                 strbuf_addstr(&new_path, old_path);
 598
 599         setenv("MANPATH", new_path.buf, 1);
 600
 601         strbuf_release(&new_path);
 602 }
 603
 604 static void exec_viewer(const char *name, const char *page)
 605 {
 606         const char *info = get_man_viewer_info(name);
 607
 608         if (!strcasecmp(name, "man"))
 609                 exec_man_man(info, page);
 610         else if (!strcasecmp(name, "woman"))
 611                 exec_woman_emacs(info, page);
 612         else if (!strcasecmp(name, "konqueror"))
 613                 exec_man_konqueror(info, page);
 614         else if (info)
 615                 exec_man_cmd(info, page);
 616         else
 617                 warning("'%s': unknown man viewer.", name);
 618 }
 619
 620 static void show_man_page(const char *git_cmd)
 621 {
 622         struct man_viewer_list *viewer;
 623         const char *page = cmd_to_page(git_cmd);
 624
 625         setup_man_path();
 626         for (viewer = man_viewer_list; viewer; viewer = viewer->next)
 627         {
 628                 exec_viewer(viewer->name, page); /* will return when unable */
 629         }
 630         exec_viewer("man", page);
 631         die("no man viewer handled the request");
 632 }
 633
 634 static void show_info_page(const char *git_cmd)
 635 {
 636         const char *page = cmd_to_page(git_cmd);
 637         setenv("INFOPATH", GIT_INFO_PATH, 1);
 638         execlp("info", "info", "gitman", page, NULL);
 639 }
 640
 641 static void get_html_page_path(struct strbuf *page_path, const char *page)
 642 {
 643         struct stat st;
 644         const char *html_path = system_path(GIT_HTML_PATH);
 645
 646         /* Check that we have a git documentation directory. */
 647         if (stat(mkpath("%s/git.html", html_path), &st)
 648             || !S_ISREG(st.st_mode))
 649                 die("'%s': not a documentation directory.", html_path);
 650
 651         strbuf_init(page_path, 0);
 652         strbuf_addf(page_path, "%s/%s.html", html_path, page);
 653 }
 654
 655 /*
 656  * If open_html is not defined in a platform-specific way (see for
 657  * example compat/mingw.h), we use the script web--browse to display
 658  * HTML.
 659  */
 660 #ifndef open_html
 661 void open_html(const char *path)
 662 {
 663         execl_git_cmd("web--browse", "-c", "help.browser", path, NULL);
 664 }
 665 #endif
 666
 667 static void show_html_page(const char *git_cmd)
 668 {
 669         const char *page = cmd_to_page(git_cmd);
 670         struct strbuf page_path; /* it leaks but we exec bellow */
 671
 672         get_html_page_path(&page_path, page);
 673
 674         open_html(page_path.buf);
 675 }
 676
 677 void help_unknown_cmd(const char *cmd)
 678 {
 679         fprintf(stderr, "git: '%s' is not a git-command. See 'git --help'.\n", cmd);
 680         exit(1);
 681 }
 682
 683 int cmd_version(int argc, const char **argv, const char *prefix)
 684 {
 685         printf("git version %s\n", git_version_string);
 686         return 0;
 687 }
 688
 689 int cmd_help(int argc, const char **argv, const char *prefix)
 690 {
 691         int nongit;
 692         const char *alias;
 693
 694         setup_git_directory_gently(&nongit);
 695         git_config(git_help_config, NULL);
 696
 697         argc = parse_options(argc, argv, builtin_help_options,
 698                         builtin_help_usage, 0);
 699
 700         if (show_all) {
 701                 unsigned int longest = load_command_list("git-", &main_cmds, &other_cmds);
 702                 printf("usage: %s\n\n", git_usage_string);
 703                 list_commands("git commands", longest, &main_cmds, &other_cmds);
 704                 printf("%s\n", git_more_info_string);
 705                 return 0;
 706         }
 707
 708         if (!argv[0]) {
 709                 printf("usage: %s\n\n", git_usage_string);
 710                 list_common_cmds_help();
 711                 printf("\n%s\n", git_more_info_string);
 712                 return 0;
 713         }
 714
 715         alias = alias_lookup(argv[0]);
 716         if (alias && !is_git_command(argv[0])) {
 717                 printf("`git %s' is aliased to `%s'\n", argv[0], alias);
 718                 return 0;
 719         }
 720
 721         switch (help_format) {
 722         case HELP_FORMAT_MAN:
 723                 show_man_page(argv[0]);
 724                 break;
 725         case HELP_FORMAT_INFO:
 726                 show_info_page(argv[0]);
 727                 break;
 728         case HELP_FORMAT_WEB:
 729                 show_html_page(argv[0]);
 730                 break;
 731         }
 732
 733         return 0;
 734 }