2 * Lexical scanner for Bacula configuration file
9 Copyright (C) 2000, 2001, 2002 Kern Sibbald and John Walker
11 This program is free software; you can redistribute it and/or
12 modify it under the terms of the GNU General Public License as
13 published by the Free Software Foundation; either version 2 of
14 the License, or (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public
22 License along with this program; if not, write to the Free
23 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
31 extern int debug_level;
34 * Scan to "logical" end of line. I.e. end of line,
37 void scan_to_eol(LEX *lc)
39 Dmsg0(150, "start scan to eof\n");
40 while (lex_get_token(lc, T_ALL) != T_EOL)
42 Dmsg0(150, "done scan to eof\n");
47 * Format a scanner error message
49 static void s_err(char *file, int line, LEX *lc, char *msg, ...)
55 va_start(arg_ptr, msg);
56 bvsnprintf(buf, sizeof(buf), msg, arg_ptr);
59 if (lc->line_no > lc->begin_line_no) {
60 sprintf(more, _("Problem probably begins at Line %d.\n"), lc->begin_line_no);
64 e_msg(file, line, M_ERROR_TERM, 0, _("Config error: %s\n\
65 : Line %d, col %d of file %s\n%s\n%s"),
66 buf, lc->line_no, lc->col_no, lc->fname, lc->line, more);
71 * Free the current file, and retrieve the contents
72 * of the previous packet if any.
75 lex_close_file(LEX *lf)
79 Dmsg1(40, "Close lex file: %s\n", lf->fname);
81 Emsg0(M_ABORT, 0, "Close of NULL file\n");
85 Dmsg1(49, "Close cfg file %s\n", lf->fname);
88 of->options = lf->options; /* preserve options */
89 memcpy(lf, of, sizeof(LEX));
90 Dmsg1(49, "Restart scan of cfg file %s\n", of->fname);
100 * Open a new configuration file. We push the
101 * state of the current file (lf) so that we
102 * can do includes. This is a bit of a hammer.
103 * Instead of passing back the pointer to the
104 * new packet, I simply replace the contents
105 * of the caller's packet with the new packet,
106 * and link the contents of the old packet into
111 lex_open_file(LEX *lf, char *filename, LEX_ERROR_HANDLER *scan_error)
116 char *fname = bstrdup(filename);
119 if ((fd = fopen(fname, "r")) == NULL) {
120 Emsg2(M_ERROR_TERM, 0, _("Cannot open config file %s: %s\n"),
121 fname, strerror(errno));
123 Dmsg1(49, "Open config file: %s\n", fname);
124 nf = (LEX *)malloc(sizeof(LEX));
126 memcpy(nf, lf, sizeof(LEX));
127 memset(lf, 0, sizeof(LEX));
128 lf->next = nf; /* if have lf, push it behind new one */
129 lf->options = nf->options; /* preserve user options */
131 lf = nf; /* start new packet */
132 memset(lf, 0, sizeof(LEX));
136 lf->state = lex_none;
139 lf->scan_error = scan_error;
141 lf->scan_error = s_err;
143 Dmsg1(49, "Return lex=%x\n", lf);
148 * Get the next character from the input.
149 * Returns the character or
150 * L_EOF if end of file
151 * L_EOL if end of line
154 lex_get_char(LEX *lf)
156 if (lf->ch == L_EOF) {
157 Emsg0(M_ABORT, 0, "get_char: called after EOF\n");
159 if (lf->ch == L_EOL) {
160 if (fgets(lf->line, MAXSTRING, lf->fd) == NULL) {
170 lf->ch = lf->line[lf->col_no];
176 Dmsg2(900, "lex_get_char: %c %d\n", lf->ch, lf->ch);
181 lex_unget_char(LEX *lf)
190 * Add a character to the current string
192 static void add_str(LEX *lf, int ch)
194 if (lf->str_len >= MAXSTRING-3) {
195 Emsg3(M_ERROR_TERM, 0, _(
196 "Token too long, file: %s, line %d, begins at line %d\n"),
197 lf->fname, lf->line_no, lf->begin_line_no);
199 lf->str[lf->str_len++] = ch;
200 lf->str[lf->str_len] = 0;
206 static void begin_str(LEX *lf, int ch)
213 lf->begin_line_no = lf->line_no; /* save start string line no */
218 lex_state_to_str(int state)
221 case lex_none: return "none";
222 case lex_comment: return "comment";
223 case lex_number: return "number";
224 case lex_ip_addr: return "ip_addr";
225 case lex_identifier: return "identifier";
226 case lex_string: return "string";
227 case lex_quoted_string: return "quoted_string";
228 default: return "??????";
234 * Convert a lex token to a string
235 * used for debug/error printing.
238 lex_tok_to_str(int token)
241 case L_EOF: return "L_EOF";
242 case L_EOL: return "L_EOL";
243 case T_NONE: return "T_NONE";
244 case T_NUMBER: return "T_NUMBER";
245 case T_IPADDR: return "T_IPADDR";
246 case T_IDENTIFIER: return "T_IDENTIFIER";
247 case T_UNQUOTED_STRING: return "T_UNQUOTED_STRING";
248 case T_QUOTED_STRING: return "T_QUOTED_STRING";
249 case T_BOB: return "T_BOB";
250 case T_EOB: return "T_EOB";
251 case T_EQUALS: return "T_EQUALS";
252 case T_ERROR: return "T_ERROR";
253 case T_EOF: return "T_EOF";
254 case T_COMMA: return "T_COMMA";
255 case T_EOL: return "T_EOL";
256 default: return "??????";
260 static uint32_t scan_pint(LEX *lf, char *str)
263 if (!is_a_number(str)) {
264 scan_err1(lf, "expected a positive integer number, got: %s", str);
268 dval = strtod(str, NULL);
269 if (errno != 0 || dval < 0) {
270 scan_err1(lf, "expected a postive integer number, got: %s", str);
274 return (uint32_t)dval;
279 * Get the next token from the input
283 lex_get_token(LEX *lf, int expect)
287 int esc_next = FALSE;
289 Dmsg0(290, "enter lex_get_token\n");
290 while (token == T_NONE) {
291 ch = lex_get_char(lf);
294 Dmsg2(290, "Lex state lex_none ch=%d,%x\n", ch, ch);
298 if (lf->options & LOPT_NO_IDENT)
299 lf->state = lex_string;
301 lf->state = lex_identifier;
306 lf->state = lex_number;
310 Dmsg0(290, "Enter lex_none switch\n");
314 Dmsg0(290, "got L_EOF set token=T_EOF\n");
317 lf->state = lex_comment;
328 lf->state = lex_quoted_string;
340 token = T_EOL; /* treat ; like EOL */
343 Dmsg0(290, "got L_EOL set token=T_EOL\n");
347 lf->state = lex_include;
351 lf->state = lex_string;
357 Dmsg1(290, "Lex state lex_comment ch=%x\n", ch);
359 lf->state = lex_none;
361 } else if (ch == L_EOF) {
366 Dmsg2(290, "Lex state lex_number ch=%x %c\n", ch, ch);
371 /* Might want to allow trailing specifications here */
377 /* A valid number can be terminated by the following */
378 if (B_ISSPACE(ch) || ch == L_EOL || ch == ',' || ch == ';') {
380 lf->state = lex_none;
382 lf->state = lex_string;
391 Dmsg1(290, "Lex state lex_ip_addr ch=%x\n", ch);
394 Dmsg1(290, "Lex state lex_string ch=%x\n", ch);
399 if (ch == '\n' || ch == L_EOL || ch == '=' || ch == '}' || ch == '{' ||
400 ch == ';' || ch == ',' || ch == '#' || (B_ISSPACE(ch)) ) {
402 token = T_UNQUOTED_STRING;
403 lf->state = lex_none;
409 Dmsg2(290, "Lex state lex_identifier ch=%x %c\n", ch, ch);
413 } else if (B_ISSPACE(ch)) {
415 } else if (ch == '\n' || ch == L_EOL || ch == '=' || ch == '}' || ch == '{' ||
416 ch == ';' || ch == ',' || ch == '"' || ch == '#') {
418 token = T_IDENTIFIER;
419 lf->state = lex_none;
421 } else if (ch == L_EOF) {
423 lf->state = lex_none;
427 /* Some non-alpha character => string */
428 lf->state = lex_string;
431 case lex_quoted_string:
432 Dmsg2(290, "Lex state lex_quoted_string ch=%x %c\n", ch, ch);
451 token = T_QUOTED_STRING;
452 lf->state = lex_none;
457 case lex_include: /* scanning a filename */
462 if (B_ISSPACE(ch) || ch == '\n' || ch == L_EOL || ch == '}' || ch == '{' ||
463 ch == ';' || ch == ',' || ch == '"' || ch == '#') {
464 lf->state = lex_none;
465 lf = lex_open_file(lf, lf->str, NULL);
471 Dmsg4(290, "ch=%d state=%s token=%s %c\n", ch, lex_state_to_str(lf->state),
472 lex_tok_to_str(token), ch);
474 Dmsg2(290, "lex returning: line %d token: %s\n", lf->line_no, lex_tok_to_str(token));
478 * Here is where we check to see if the user has set certain
479 * expectations (e.g. 32 bit integer). If so, we do type checking
480 * and possible additional scanning (e.g. for range).
484 lf->pint32_val = scan_pint(lf, lf->str);
485 lf->pint32_val2 = lf->pint32_val;
490 if (token == T_NUMBER) {
491 lf->pint32_val = scan_pint(lf, lf->str);
492 lf->pint32_val2 = lf->pint32_val;
495 char *p = strchr(lf->str, '-');
497 scan_err2(lf, "expected an integer or a range, got %s: %s",
498 lex_tok_to_str(token), lf->str);
502 *p++ = 0; /* terminate first half of range */
503 lf->pint32_val = scan_pint(lf, lf->str);
504 lf->pint32_val2 = scan_pint(lf, p);
505 token = T_PINT32_RANGE;
510 if (token != T_NUMBER || !is_a_number(lf->str)) {
511 scan_err2(lf, "expected an integer number, got %s: %s",
512 lex_tok_to_str(token), lf->str);
517 lf->int32_val = (int32_t)strtod(lf->str, NULL);
519 scan_err2(lf, "expected an integer number, got %s: %s",
520 lex_tok_to_str(token), lf->str);
528 Dmsg2(400, "int64=:%s: %f\n", lf->str, strtod(lf->str, NULL));
529 if (token != T_NUMBER || !is_a_number(lf->str)) {
530 scan_err2(lf, "expected an integer number, got %s: %s",
531 lex_tok_to_str(token), lf->str);
536 lf->int64_val = (int64_t)strtod(lf->str, NULL);
538 scan_err2(lf, "expected an integer number, got %s: %s",
539 lex_tok_to_str(token), lf->str);
547 if (token != T_IDENTIFIER && token != T_UNQUOTED_STRING && token != T_QUOTED_STRING) {
548 scan_err2(lf, "expected a name, got %s: %s",
549 lex_tok_to_str(token), lf->str);
551 } else if (lf->str_len > MAX_RES_NAME_LENGTH) {
552 scan_err3(lf, "name %s length %d too long, max is %d\n", lf->str,
553 lf->str_len, MAX_RES_NAME_LENGTH);
561 if (token != T_IDENTIFIER && token != T_UNQUOTED_STRING && token != T_QUOTED_STRING) {
562 scan_err2(lf, "expected a string, got %s: %s",
563 lex_tok_to_str(token), lf->str);
572 break; /* no expectation given */
574 lf->token = token; /* set possible new token */