1 /****************************************************************************
2 * Copyright (c) 1998-2012,2013 Free Software Foundation, Inc. *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
7 * without limitation the rights to use, copy, modify, merge, publish, *
8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
25 * sale, use or other dealings in this Software without prior written *
27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
31 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
32 * and: Thomas E. Dickey 1996 on *
33 ****************************************************************************/
38 * comp_scan.c --- Lexical scanner for terminfo compiler.
45 * long _nc_curr_file_pos;
46 * long _nc_comment_start;
47 * long _nc_comment_end;
50 #include <curses.priv.h>
55 MODULE_ID("$Id: comp_scan.c,v 1.102 2013/11/16 19:57:50 tom Exp $")
58 * Maximum length of string capability we'll accept before raising an error.
59 * Yes, there is a real capability in /etc/termcap this long, an "is".
63 #define iswhite(ch) (ch == ' ' || ch == '\t')
65 NCURSES_EXPORT_VAR (int) _nc_syntax = 0; /* termcap or terminfo? */
66 NCURSES_EXPORT_VAR (int) _nc_strict_bsd = 1; /* ncurses extended termcap? */
67 NCURSES_EXPORT_VAR (long) _nc_curr_file_pos = 0; /* file offset of current line */
68 NCURSES_EXPORT_VAR (long) _nc_comment_start = 0; /* start of comment range before name */
69 NCURSES_EXPORT_VAR (long) _nc_comment_end = 0; /* end of comment range before name */
70 NCURSES_EXPORT_VAR (long) _nc_start_line = 0; /* start line of current entry */
72 NCURSES_EXPORT_VAR (struct token) _nc_curr_token =
77 /*****************************************************************************
79 * Token-grabbing machinery
81 *****************************************************************************/
83 static bool first_column; /* See 'next_char()' below */
84 static bool had_newline;
85 static char separator; /* capability separator */
86 static int pushtype; /* type of pushback token */
87 static char *pushname;
90 NCURSES_EXPORT_VAR (bool) _nc_disable_period = FALSE; /* used by tic -a option */
93 /*****************************************************************************
95 * Character-stream handling
97 *****************************************************************************/
99 #define LEXBUFSIZ 1024
101 static char *bufptr; /* otherwise, the input buffer pointer */
102 static char *bufstart; /* start of buffer so we can compute offsets */
103 static FILE *yyin; /* scanner's input file descriptor */
108 * Resets the input-reading routines. Used on initialization,
109 * or after a seek has been done. Exactly one argument must be
114 _nc_reset_input(FILE *fp, char *buf)
116 pushtype = NO_PUSHBACK;
120 bufstart = bufptr = buf;
121 _nc_curr_file_pos = 0L;
130 * Returns the final nonblank character on the current input buffer
133 last_char(int from_end)
135 size_t len = strlen(bufptr);
139 if (!isspace(UChar(bufptr[len]))) {
140 if (from_end < (int) len)
141 result = bufptr[(int) len - from_end];
151 * Returns the next character in the input stream. Comments and leading
152 * white space are stripped.
154 * The global state variable 'firstcolumn' is set TRUE if the character
155 * returned is from the first column of the input line.
157 * The global variable _nc_curr_line is incremented for each new line.
158 * The global variable _nc_curr_file_pos is set to the file offset of the
159 * beginning of each line.
166 static size_t allocated;
172 FreeAndNull(pushname);
176 * An string with an embedded null will truncate the input. This is
177 * intentional (we don't read binary files here).
179 if (bufptr == 0 || *bufptr == '\0')
181 if (*bufptr == '\n') {
184 } else if (*bufptr == '\t') {
185 _nc_curr_col = (_nc_curr_col | 7);
187 } else if (!bufptr || !*bufptr) {
189 * In theory this could be recoded to do its I/O one character at a
190 * time, saving the buffer space. In practice, this turns out to be
191 * quite hard to get completely right. Try it and see. If you
192 * succeed, don't forget to hack push_back() correspondingly.
201 if (used + (LEXBUFSIZ / 4) >= allocated) {
202 allocated += (allocated + LEXBUFSIZ);
203 result = typeRealloc(char, allocated, result);
210 _nc_curr_file_pos = ftell(yyin);
212 if (fgets(result + used, (int) (allocated - used), yyin) != 0) {
215 if (_nc_curr_line == 0
216 && IS_TIC_MAGIC(result)) {
217 _nc_err_abort("This is a compiled terminal description, not a source");
224 _nc_STRCAT(result, "\n", allocated);
226 if ((bufptr = bufstart) != 0) {
227 used = strlen(bufptr);
228 while (iswhite(*bufptr)) {
229 if (*bufptr == '\t') {
230 _nc_curr_col = (_nc_curr_col | 7) + 1;
238 * Treat a trailing <cr><lf> the same as a <newline> so we
239 * can read files on OS/2, etc.
241 if ((len = strlen(bufptr)) > 1) {
242 if (bufptr[len - 1] == '\n'
243 && bufptr[len - 2] == '\r') {
245 bufptr[len - 1] = '\n';
252 } while (bufptr[len - 1] != '\n'); /* complete a line */
253 } while (result[0] == '#'); /* ignore comments */
254 } else if (*bufptr == '\t') {
255 _nc_curr_col = (_nc_curr_col | 7);
258 first_column = (bufptr == bufstart);
263 the_char = *bufptr++;
264 return UChar(the_char);
269 /* push a character back onto the input stream */
271 if (bufptr == bufstart)
272 _nc_syserr_abort("Can't backspace off beginning of line");
273 *--bufptr = (char) c;
279 /* return our current character position in the input stream */
281 return (yyin ? ftell(yyin) : (bufptr ? bufptr - bufstart : 0));
286 /* are we at end of input? */
288 return ((yyin ? feof(yyin) : (bufptr && *bufptr == '\0'))
292 /* Assume we may be looking at a termcap-style continuation */
293 static NCURSES_INLINE int
294 eat_escaped_newline(int ch)
297 while ((ch = next_char()) == '\n' || iswhite(ch))
302 #define TOK_BUF_SIZE MAX_ENTRY_SIZE
305 ((tok_ptr - tok_buf) < (TOK_BUF_SIZE - 2))
308 *tok_ptr++ = (char) ch; \
311 static char *tok_buf;
317 * Scans the input for the next token, storing the specifics in the
318 * global structure 'curr_token' and returning one of the following:
320 * NAMES A line beginning in column 1. 'name'
321 * will be set to point to everything up to but
322 * not including the first separator on the line.
323 * BOOLEAN An entry consisting of a name followed by
324 * a separator. 'name' will be set to point to
325 * the name of the capability.
326 * NUMBER An entry of the form
328 * 'name' will be set to point to the capability
329 * name and 'valnumber' to the number given.
330 * STRING An entry of the form
332 * 'name' is set to the capability name and
333 * 'valstring' to the string of characters, with
334 * input translations done.
335 * CANCEL An entry of the form
337 * 'name' is set to the capability name and
339 * EOF The end of the file has been reached.
341 * A `separator' is either a comma or a semicolon, depending on whether
342 * we are in termcap or terminfo mode.
347 _nc_get_token(bool silent)
349 static const char terminfo_punct[] = "@%&*!#";
351 char *after_name; /* after primary name */
352 char *after_list; /* after primary and alias list */
358 int dot_flag = FALSE;
368 if (pushtype != NO_PUSHBACK) {
369 int retval = pushtype;
371 _nc_set_type(pushname != 0 ? pushname : "");
372 DEBUG(3, ("pushed-back token: `%s', class %d",
373 _nc_curr_token.tk_name, pushtype));
375 pushtype = NO_PUSHBACK;
379 /* currtok wasn't altered by _nc_push_token() */
383 if (end_of_stream()) {
385 (void) next_char(); /* frees its allocated memory */
387 if (_nc_curr_token.tk_name == tok_buf)
388 _nc_curr_token.tk_name = 0;
394 token_start = stream_pos();
395 while ((ch = next_char()) == '\n' || iswhite(ch)) {
401 ch = eat_escaped_newline(ch);
402 _nc_curr_token.tk_valstring = 0;
405 old_line = _nc_curr_line;
406 old_col = _nc_curr_col;
411 /* if this is a termcap entry, skip a leading separator */
412 if (separator == ':' && ch == ':')
416 #if NCURSES_EXT_FUNCS
417 && !_nc_disable_period
421 DEBUG(8, ("dot-flag set"));
423 while ((ch = next_char()) == '.' || iswhite(ch))
432 /* have to make some punctuation chars legal for terminfo */
433 if (!isalnum(UChar(ch))
434 #if NCURSES_EXT_FUNCS
435 && !(ch == '.' && _nc_disable_period)
437 && ((strchr) (terminfo_punct, (char) ch) == 0)) {
439 _nc_warning("Illegal character (expected alphanumeric or %s) - '%s'",
440 terminfo_punct, unctrl(UChar(ch)));
441 _nc_panic_mode(separator);
446 tok_buf = typeMalloc(char, TOK_BUF_SIZE);
449 old_line = _nc_curr_line;
450 old_col = _nc_curr_col;
456 _nc_comment_start = token_start;
457 _nc_comment_end = _nc_curr_file_pos;
458 _nc_start_line = _nc_curr_line;
463 while ((ch = next_char()) != '\n') {
465 _nc_err_abort(MSG_NO_INPUTS);
466 } else if (ch == '|') {
467 after_list = tok_ptr;
469 after_name = tok_ptr;
470 } else if (ch == ':' && last_char(0) != ',') {
471 _nc_syntax = SYN_TERMCAP;
474 } else if (ch == ',') {
475 _nc_syntax = SYN_TERMINFO;
478 * If we did not see a '|', then we found a name with no
479 * aliases or description.
484 * We saw a comma, but are not entirely sure this is
485 * terminfo format, since we can still be parsing the
486 * description field (for either syntax).
488 * A properly formatted termcap line ends with either a
489 * colon, or a backslash after a colon. It is possible
490 * to have a backslash in the middle of a capability, but
491 * then there would be no leading whitespace on the next
492 * line - something we want to discourage.
496 if (c1 != ':' && c0 != '\\' && c0 != ':') {
497 bool capability = FALSE;
500 * Since it is not termcap, assume the line is terminfo
501 * format. However, the comma can be embedded in a
502 * description field. It also can be a separator
503 * between a description field and a capability.
505 * Improve the guess by checking if the next word after
506 * the comma does not look like a capability. In that
507 * case, extend the description past the comma.
509 for (s = bufptr; isspace(UChar(*s)); ++s) {
512 if (islower(UChar(*s))) {
514 while (isalnum(UChar(*s))) {
517 if (*s == '#' || *s == '=' || *s == '@') {
519 * Checking solely with syntax allows us to
520 * support extended capabilities with string
524 } else if (*s == ',') {
528 * Otherwise, we can handle predefined boolean
529 * capabilities, still aided by syntax.
531 if (_nc_find_entry(name,
532 _nc_get_hash_table(FALSE))) {
543 ch = eat_escaped_newline(ch);
552 if (_nc_syntax == ERR) {
554 * Grrr...what we ought to do here is barf, complaining that
555 * the entry is malformed. But because a couple of name fields
556 * in the 8.2 termcap file end with |\, we just have to assume
557 * it's termcap syntax.
559 _nc_syntax = SYN_TERMCAP;
561 } else if (_nc_syntax == SYN_TERMINFO) {
562 /* throw away trailing /, *$/ */
564 iswhite(*tok_ptr) || *tok_ptr == ',';
571 * This is the soonest we have the terminal name fetched. Set up
572 * for following warning messages. If there's no '|', then there
575 if (after_name != 0) {
578 _nc_set_type(tok_buf);
579 *after_name = (char) ch;
583 * Compute the boundary between the aliases and the description
584 * field for syntax-checking purposes.
586 if (after_list != 0) {
588 if (*after_list == '\0')
589 _nc_warning("empty longname field");
590 #ifndef FREEBSD_NATIVE
591 else if (strchr(after_list, ' ') == 0)
592 _nc_warning("older tic versions may treat the description field as an alias");
596 after_list = tok_buf + strlen(tok_buf);
597 DEBUG(1, ("missing description"));
601 * Whitespace in a name field other than the long name can confuse
602 * rdist and some termcap tools. Slashes are a no-no. Other
603 * special characters can be dangerous due to shell expansion.
605 for (s = tok_buf; s < after_list; ++s) {
606 if (isspace(UChar(*s))) {
608 _nc_warning("whitespace in name or alias field");
610 } else if (*s == '/') {
612 _nc_warning("slashes aren't allowed in names or aliases");
614 } else if (strchr("$[]!*?", *s)) {
616 _nc_warning("dubious character `%c' in name or alias field", *s);
621 _nc_curr_token.tk_name = tok_buf;
624 if (had_newline && _nc_syntax == SYN_TERMCAP) {
625 _nc_warning("Missing backslash before newline");
628 while ((ch = next_char()) != EOF) {
629 if (!isalnum(UChar(ch))) {
630 if (_nc_syntax == SYN_TERMINFO) {
633 } else { /* allow ';' for "k;" */
646 *tok_ptr++ = '\0'; /* separate name/value in buffer */
651 _nc_err_abort("Separator inconsistent with syntax");
652 _nc_curr_token.tk_name = tok_buf;
656 if ((ch = next_char()) != separator && !silent)
657 _nc_warning("Missing separator after `%s', have %s",
658 tok_buf, unctrl(UChar(ch)));
659 _nc_curr_token.tk_name = tok_buf;
665 while (isalnum(ch = next_char())) {
666 numbuf[found++] = (char) ch;
667 if (found >= sizeof(numbuf) - 1)
670 numbuf[found] = '\0';
671 number = strtol(numbuf, &numchk, 0);
673 if (numchk == numbuf)
674 _nc_warning("no value given for `%s'", tok_buf);
675 if ((*numchk != '\0') || (ch != separator))
676 _nc_warning("Missing separator");
678 _nc_curr_token.tk_name = tok_buf;
679 _nc_curr_token.tk_valnumber = (int) number;
684 ch = _nc_trans_string(tok_ptr, tok_buf + TOK_BUF_SIZE);
685 if (!silent && ch != separator)
686 _nc_warning("Missing separator");
687 _nc_curr_token.tk_name = tok_buf;
688 _nc_curr_token.tk_valstring = tok_ptr;
696 /* just to get rid of the compiler warning */
699 _nc_warning("Illegal character - '%s'", unctrl(UChar(ch)));
701 } /* end else (first_column == FALSE) */
702 } /* end else (ch != EOF) */
707 if (dot_flag == TRUE)
708 DEBUG(8, ("Commented out "));
710 if (_nc_tracing >= DEBUG_LEVEL(8)) {
711 _tracef("parsed %d.%d to %d.%d",
713 _nc_curr_line, _nc_curr_col);
715 if (_nc_tracing >= DEBUG_LEVEL(7)) {
718 _tracef("Token: Boolean; name='%s'",
719 _nc_curr_token.tk_name);
723 _tracef("Token: Number; name='%s', value=%d",
724 _nc_curr_token.tk_name,
725 _nc_curr_token.tk_valnumber);
729 _tracef("Token: String; name='%s', value=%s",
730 _nc_curr_token.tk_name,
731 _nc_visbuf(_nc_curr_token.tk_valstring));
735 _tracef("Token: Cancel; name='%s'",
736 _nc_curr_token.tk_name);
741 _tracef("Token: Names; value='%s'",
742 _nc_curr_token.tk_name);
746 _tracef("Token: End of file");
750 _nc_warning("Bad token type");
755 if (dot_flag == TRUE) /* if commented out, use the next one */
756 type = _nc_get_token(silent);
758 DEBUG(3, ("token: `%s', class %d",
759 ((_nc_curr_token.tk_name != 0)
760 ? _nc_curr_token.tk_name
771 * Reads characters using next_char() until encountering a separator, nl,
772 * or end-of-file. The returned value is the character which caused
773 * reading to stop. The following translations are done on the input:
775 * ^X goes to ctrl-X (i.e. X & 037)
776 * {\E,\n,\r,\b,\t,\f} go to
777 * {ESCAPE,newline,carriage-return,backspace,tab,formfeed}
778 * {\^,\\} go to {carat,backslash}
779 * \ddd (for ddd = up to three octal digits) goes to the character ddd
787 _nc_trans_string(char *ptr, char *last)
793 bool ignored = FALSE;
794 bool long_warning = FALSE;
796 while ((c = next_char()) != separator && c != EOF) {
797 if (ptr >= (last - 1)) {
799 while ((c = next_char()) != separator && c != EOF) {
805 if ((_nc_syntax == SYN_TERMCAP) && c == '\n')
807 if (c == '^' && last_ch != '%') {
810 _nc_err_abort(MSG_NO_INPUTS);
812 if (!(is7bits(c) && isprint(c))) {
813 _nc_warning("Illegal ^ character - '%s'", unctrl(UChar(c)));
815 if (c == '?' && (_nc_syntax != SYN_TERMCAP)) {
818 _nc_warning("Allow ^? as synonym for \\177");
822 *(ptr++) = (char) (c);
824 } else if (c == '\\') {
825 bool strict_bsd = ((_nc_syntax == SYN_TERMCAP) && _nc_strict_bsd);
829 _nc_err_abort(MSG_NO_INPUTS);
831 #define isoctal(c) ((c) >= '0' && (c) <= '7')
833 if (isoctal(c) || (strict_bsd && isdigit(c))) {
835 for (i = 0; i < 2; i++) {
838 _nc_err_abort(MSG_NO_INPUTS);
843 _nc_warning("Non-octal digit `%c' in \\ sequence", c);
844 /* allow the digit; it'll do less harm */
852 number = number * 8 + c - '0';
855 number = UChar(number);
856 if (number == 0 && !strict_bsd)
858 *(ptr++) = (char) number;
901 if ((_nc_syntax == SYN_TERMINFO) || !_nc_strict_bsd) {
919 _nc_warning("Illegal character '%s' in \\ sequence",
927 } /* endswitch (c) */
928 } /* endelse (c < '0' || c > '7') */
930 /* end else if (c == '\\') */
931 else if (c == '\n' && (_nc_syntax == SYN_TERMINFO)) {
933 * Newlines embedded in a terminfo string are ignored, provided
934 * that the next line begins with whitespace.
942 if (_nc_curr_col <= 1) {
952 if (count > MAXCAPLEN && !long_warning) {
953 _nc_warning("Very long string found. Missing separator?");
966 * Push a token of given type so that it will be reread by the next
971 _nc_push_token(int tokclass)
974 * This implementation is kind of bogus, it will fail if we ever do more
975 * than one pushback at a time between get_token() calls. It relies on the
976 * fact that _nc_curr_token is static storage that nothing but
977 * _nc_get_token() touches.
981 pushname = typeMalloc(char, MAX_NAME_SIZE + 1);
982 _nc_get_type(pushname);
984 DEBUG(3, ("pushing token: `%s', class %d",
985 ((_nc_curr_token.tk_name != 0)
986 ? _nc_curr_token.tk_name
992 * Panic mode error recovery - skip everything until a "ch" is found.
995 _nc_panic_mode(char ch)
1009 NCURSES_EXPORT(void)
1010 _nc_comp_scan_leaks(void)
1012 if (pushname != 0) {
1013 FreeAndNull(pushname);
1016 FreeAndNull(tok_buf);