22     char_u	*arg;  in ex_help()  local
49 	for (arg = eap->arg; *arg; ++arg)  in ex_help()
51 	    if (*arg == '\n' || *arg == '\r'  in ex_help()
52 		    || (*arg == '|' && arg[1] != NUL && arg[1] != '|'))  in ex_help()
54 		*arg++ = NUL;  in ex_help()
55 		eap->nextcmd = arg;  in ex_help()
59 	arg = eap->arg;  in ex_help()
61 	if (eap->forceit && *arg == NUL && !curbuf->b_help)  in ex_help()
71 	arg = (char_u *)"";  in ex_help()
74     p = arg + STRLEN(arg) - 1;  in ex_help()
75     while (p > arg && VIM_ISWHITE(*p) && p[-1] != '\\')  in ex_help()
80     lang = check_help_lang(arg);  in ex_help()
84     if (*arg == NUL)  in ex_help()
85 	arg = (char_u *)"help.txt";  in ex_help()
88     n = find_help_tags(arg, &num_matches, &matches,  in ex_help()
107 	    semsg(_("E661: Sorry, no '%s' help for %s"), lang, arg);  in ex_help()
110 	    semsg(_("E149: Sorry, no help for %s"), arg);  in ex_help()
229 check_help_lang(char_u *arg)  in check_help_lang()  argument
231     int len = (int)STRLEN(arg);  in check_help_lang()
233     if (len >= 3 && arg[len - 3] == '@' && ASCII_ISALPHA(arg[len - 2])  in check_help_lang()
234 					       && ASCII_ISALPHA(arg[len - 1]))  in check_help_lang()
236 	arg[len - 3] = NUL;		// remove the '@'  in check_help_lang()
237 	return arg + len - 2;  in check_help_lang()
320     char_u	*arg,  in find_help_tags()  argument
379     if (STRNICMP(arg, "expr-", 5) == 0)  in find_help_tags()
385 	    if (STRCMP(arg + 5, expr_table[i]) == 0)  in find_help_tags()
391 		    if (arg[si] == '~')  in find_help_tags()
393 		    d[di++] = arg[si];  in find_help_tags()
394 		    if (arg[si] == NUL)  in find_help_tags()
406 	    if (STRCMP(arg, except_tbl[i][0]) == 0)  in find_help_tags()
420 	if (arg[0] == '\\'  in find_help_tags()
421 		&& ((arg[1] != NUL && arg[2] == NUL)  in find_help_tags()
422 		    || (vim_strchr((char_u *)"%_z@", arg[1]) != NULL  in find_help_tags()
423 							   && arg[2] != NUL)))  in find_help_tags()
426 	    STRCPY(d + 3, arg + 1);  in find_help_tags()
437 	    if ((arg[0] == '[' && (arg[1] == ':'  in find_help_tags()
438 			 || (arg[1] == '+' && arg[2] == '+')))  in find_help_tags()
439 		    || (arg[0] == '\\' && arg[1] == '{'))  in find_help_tags()
443 	  if (*arg == '(' && arg[1] == '\'')  in find_help_tags()
444 	      arg++;  in find_help_tags()
445 	  for (s = arg; *s; ++s)  in find_help_tags()
505 					       && *arg == '/' && s == arg + 1)  in find_help_tags()
526 	    if (*s == '\'' && s > arg && *arg == '\'')  in find_help_tags()
529 	    if (*s == '}' && s > arg && *arg == '{')  in find_help_tags()
1302     if (STRNCMP(eap->arg, "++t", 3) == 0 && VIM_ISWHITE(eap->arg[3]))  in ex_helptags()
1305 	eap->arg = skipwhite(eap->arg + 3);  in ex_helptags()
1308     if (STRCMP(eap->arg, "ALL") == 0)  in ex_helptags()
1317 	dirname = ExpandOne(&xpc, eap->arg, NULL,  in ex_helptags()
1320 	    semsg(_("E150: Not a directory: %s"), eap->arg);  in ex_helptags()