1 /****************************************************************************
2 * Copyright (c) 1998-2006,2008 Free Software Foundation, Inc. *
3 * *
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: *
11 * *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
14 * *
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. *
22 * *
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 *
26 * authorization. *
27 ****************************************************************************/
28
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 ****************************************************************************/
34
35 /* $FreeBSD: stable/10/contrib/ncurses/ncurses/tinfo/comp_scan.c 184989 2008-11-15 09:23:48Z rafan $ */
36
37 /*
38 * comp_scan.c --- Lexical scanner for terminfo compiler.
39 *
40 * _nc_reset_input()
41 * _nc_get_token()
42 * _nc_panic_mode()
43 * int _nc_syntax;
44 * int _nc_curr_line;
45 * long _nc_curr_file_pos;
46 * long _nc_comment_start;
47 * long _nc_comment_end;
48 */
49
50 #include <curses.priv.h>
51
52 #include <ctype.h>
53 #include <term_entry.h>
54 #include <tic.h>
55
56 MODULE_ID("$Id: comp_scan.c,v 1.83 2008/08/16 19:22:55 tom Exp $")
57
58 /*
59 * Maximum length of string capability we'll accept before raising an error.
60 * Yes, there is a real capability in /etc/termcap this long, an "is".
61 */
62 #define MAXCAPLEN 600
63
64 #define iswhite(ch) (ch == ' ' || ch == '\t')
65
66 NCURSES_EXPORT_VAR(int)
67 _nc_syntax = 0; /* termcap or terminfo? */
68 NCURSES_EXPORT_VAR(long)
69 _nc_curr_file_pos = 0; /* file offset of current line */
70 NCURSES_EXPORT_VAR(long)
71 _nc_comment_start = 0; /* start of comment range before name */
72 NCURSES_EXPORT_VAR(long)
73 _nc_comment_end = 0; /* end of comment range before name */
74 NCURSES_EXPORT_VAR(long)
75 _nc_start_line = 0; /* start line of current entry */
76
77 NCURSES_EXPORT_VAR(struct token)
78 _nc_curr_token =
79 {
80 0, 0, 0
81 };
82
83 /*****************************************************************************
84 *
85 * Token-grabbing machinery
86 *
87 *****************************************************************************/
88
89 static bool first_column; /* See 'next_char()' below */
90 static bool had_newline;
91 static char separator; /* capability separator */
92 static int pushtype; /* type of pushback token */
93 static char *pushname;
94
95 #if NCURSES_EXT_FUNCS
96 NCURSES_EXPORT_VAR(bool)
97 _nc_disable_period = FALSE; /* used by tic -a option */
98 #endif
99
100 /*****************************************************************************
101 *
102 * Character-stream handling
103 *
104 *****************************************************************************/
105
106 #define LEXBUFSIZ 1024
107
108 static char *bufptr; /* otherwise, the input buffer pointer */
109 static char *bufstart; /* start of buffer so we can compute offsets */
110 static FILE *yyin; /* scanner's input file descriptor */
111
112 /*
113 * _nc_reset_input()
114 *
115 * Resets the input-reading routines. Used on initialization,
116 * or after a seek has been done. Exactly one argument must be
117 * non-null.
118 */
119
120 NCURSES_EXPORT(void)
_nc_reset_input(FILE * fp,char * buf)121 _nc_reset_input(FILE *fp, char *buf)
122 {
123 pushtype = NO_PUSHBACK;
124 if (pushname != 0)
125 pushname[0] = '\0';
126 yyin = fp;
127 bufstart = bufptr = buf;
128 _nc_curr_file_pos = 0L;
129 if (fp != 0)
130 _nc_curr_line = 0;
131 _nc_curr_col = 0;
132 }
133
134 /*
135 * int last_char()
136 *
137 * Returns the final nonblank character on the current input buffer
138 */
139 static int
last_char(void)140 last_char(void)
141 {
142 size_t len = strlen(bufptr);
143 while (len--) {
144 if (!isspace(UChar(bufptr[len])))
145 return bufptr[len];
146 }
147 return 0;
148 }
149
150 /*
151 * int next_char()
152 *
153 * Returns the next character in the input stream. Comments and leading
154 * white space are stripped.
155 *
156 * The global state variable 'firstcolumn' is set TRUE if the character
157 * returned is from the first column of the input line.
158 *
159 * The global variable _nc_curr_line is incremented for each new line.
160 * The global variable _nc_curr_file_pos is set to the file offset of the
161 * beginning of each line.
162 */
163
164 static int
next_char(void)165 next_char(void)
166 {
167 static char *result;
168 static size_t allocated;
169 int the_char;
170
171 if (!yyin) {
172 if (result != 0) {
173 FreeAndNull(result);
174 FreeAndNull(pushname);
175 allocated = 0;
176 }
177 /*
178 * An string with an embedded null will truncate the input. This is
179 * intentional (we don't read binary files here).
180 */
181 if (bufptr == 0 || *bufptr == '\0')
182 return (EOF);
183 if (*bufptr == '\n') {
184 _nc_curr_line++;
185 _nc_curr_col = 0;
186 } else if (*bufptr == '\t') {
187 _nc_curr_col = (_nc_curr_col | 7);
188 }
189 } else if (!bufptr || !*bufptr) {
190 /*
191 * In theory this could be recoded to do its I/O one character at a
192 * time, saving the buffer space. In practice, this turns out to be
193 * quite hard to get completely right. Try it and see. If you
194 * succeed, don't forget to hack push_back() correspondingly.
195 */
196 size_t used;
197 size_t len;
198
199 do {
200 bufstart = 0;
201 used = 0;
202 do {
203 if (used + (LEXBUFSIZ / 4) >= allocated) {
204 allocated += (allocated + LEXBUFSIZ);
205 result = typeRealloc(char, allocated, result);
206 if (result == 0)
207 return (EOF);
208 bufstart = result;
209 }
210 if (used == 0)
211 _nc_curr_file_pos = ftell(yyin);
212
213 if (fgets(result + used, (int) (allocated - used), yyin) != 0) {
214 bufstart = result;
215 if (used == 0) {
216 _nc_curr_line++;
217 _nc_curr_col = 0;
218 }
219 } else {
220 if (used != 0)
221 strcat(result, "\n");
222 }
223 if ((bufptr = bufstart) != 0) {
224 used = strlen(bufptr);
225 while (iswhite(*bufptr)) {
226 if (*bufptr == '\t') {
227 _nc_curr_col = (_nc_curr_col | 7) + 1;
228 } else {
229 _nc_curr_col++;
230 }
231 bufptr++;
232 }
233
234 /*
235 * Treat a trailing <cr><lf> the same as a <newline> so we
236 * can read files on OS/2, etc.
237 */
238 if ((len = strlen(bufptr)) > 1) {
239 if (bufptr[len - 1] == '\n'
240 && bufptr[len - 2] == '\r') {
241 len--;
242 bufptr[len - 1] = '\n';
243 bufptr[len] = '\0';
244 }
245 }
246 } else {
247 return (EOF);
248 }
249 } while (bufptr[len - 1] != '\n'); /* complete a line */
250 } while (result[0] == '#'); /* ignore comments */
251 } else if (*bufptr == '\t') {
252 _nc_curr_col = (_nc_curr_col | 7);
253 }
254
255 first_column = (bufptr == bufstart);
256 if (first_column)
257 had_newline = FALSE;
258
259 _nc_curr_col++;
260 the_char = *bufptr++;
261 return UChar(the_char);
262 }
263
264 static void
push_back(char c)265 push_back(char c)
266 /* push a character back onto the input stream */
267 {
268 if (bufptr == bufstart)
269 _nc_syserr_abort("Can't backspace off beginning of line");
270 *--bufptr = c;
271 _nc_curr_col--;
272 }
273
274 static long
stream_pos(void)275 stream_pos(void)
276 /* return our current character position in the input stream */
277 {
278 return (yyin ? ftell(yyin) : (bufptr ? bufptr - bufstart : 0));
279 }
280
281 static bool
end_of_stream(void)282 end_of_stream(void)
283 /* are we at end of input? */
284 {
285 return ((yyin ? feof(yyin) : (bufptr && *bufptr == '\0'))
286 ? TRUE : FALSE);
287 }
288
289 /* Assume we may be looking at a termcap-style continuation */
290 static NCURSES_INLINE int
eat_escaped_newline(int ch)291 eat_escaped_newline(int ch)
292 {
293 if (ch == '\\')
294 while ((ch = next_char()) == '\n' || iswhite(ch))
295 continue;
296 return ch;
297 }
298
299 #define TOK_BUF_SIZE MAX_ENTRY_SIZE
300
301 #define OkToAdd() \
302 ((tok_ptr - tok_buf) < (TOK_BUF_SIZE - 2))
303
304 #define AddCh(ch) \
305 *tok_ptr++ = (char) ch; \
306 *tok_ptr = '\0'
307
308 /*
309 * int
310 * get_token()
311 *
312 * Scans the input for the next token, storing the specifics in the
313 * global structure 'curr_token' and returning one of the following:
314 *
315 * NAMES A line beginning in column 1. 'name'
316 * will be set to point to everything up to but
317 * not including the first separator on the line.
318 * BOOLEAN An entry consisting of a name followed by
319 * a separator. 'name' will be set to point to
320 * the name of the capability.
321 * NUMBER An entry of the form
322 * name#digits,
323 * 'name' will be set to point to the capability
324 * name and 'valnumber' to the number given.
325 * STRING An entry of the form
326 * name=characters,
327 * 'name' is set to the capability name and
328 * 'valstring' to the string of characters, with
329 * input translations done.
330 * CANCEL An entry of the form
331 * name@,
332 * 'name' is set to the capability name and
333 * 'valnumber' to -1.
334 * EOF The end of the file has been reached.
335 *
336 * A `separator' is either a comma or a semicolon, depending on whether
337 * we are in termcap or terminfo mode.
338 *
339 */
340
341 NCURSES_EXPORT(int)
_nc_get_token(bool silent)342 _nc_get_token(bool silent)
343 {
344 static const char terminfo_punct[] = "@%&*!#";
345 static char *tok_buf;
346
347 char *after_list;
348 char *after_name;
349 char *numchk;
350 char *tok_ptr;
351 char *s;
352 char numbuf[80];
353 int ch;
354 int dot_flag = FALSE;
355 int type;
356 long number;
357 long token_start;
358 unsigned found;
359 #ifdef TRACE
360 int old_line;
361 int old_col;
362 #endif
363
364 if (pushtype != NO_PUSHBACK) {
365 int retval = pushtype;
366
367 _nc_set_type(pushname != 0 ? pushname : "");
368 DEBUG(3, ("pushed-back token: `%s', class %d",
369 _nc_curr_token.tk_name, pushtype));
370
371 pushtype = NO_PUSHBACK;
372 if (pushname != 0)
373 pushname[0] = '\0';
374
375 /* currtok wasn't altered by _nc_push_token() */
376 return (retval);
377 }
378
379 if (end_of_stream()) {
380 yyin = 0;
381 next_char(); /* frees its allocated memory */
382 if (tok_buf != 0) {
383 if (_nc_curr_token.tk_name == tok_buf)
384 _nc_curr_token.tk_name = 0;
385 FreeAndNull(tok_buf);
386 }
387 return (EOF);
388 }
389
390 start_token:
391 token_start = stream_pos();
392 while ((ch = next_char()) == '\n' || iswhite(ch)) {
393 if (ch == '\n')
394 had_newline = TRUE;
395 continue;
396 }
397
398 ch = eat_escaped_newline(ch);
399
400 #ifdef TRACE
401 old_line = _nc_curr_line;
402 old_col = _nc_curr_col;
403 #endif
404 if (ch == EOF)
405 type = EOF;
406 else {
407 /* if this is a termcap entry, skip a leading separator */
408 if (separator == ':' && ch == ':')
409 ch = next_char();
410
411 if (ch == '.'
412 #if NCURSES_EXT_FUNCS
413 && !_nc_disable_period
414 #endif
415 ) {
416 dot_flag = TRUE;
417 DEBUG(8, ("dot-flag set"));
418
419 while ((ch = next_char()) == '.' || iswhite(ch))
420 continue;
421 }
422
423 if (ch == EOF) {
424 type = EOF;
425 goto end_of_token;
426 }
427
428 /* have to make some punctuation chars legal for terminfo */
429 if (!isalnum(UChar(ch))
430 #if NCURSES_EXT_FUNCS
431 && !(ch == '.' && _nc_disable_period)
432 #endif
433 && !strchr(terminfo_punct, (char) ch)) {
434 if (!silent)
435 _nc_warning("Illegal character (expected alphanumeric or %s) - '%s'",
436 terminfo_punct, unctrl((chtype) ch));
437 _nc_panic_mode(separator);
438 goto start_token;
439 }
440
441 if (tok_buf == 0)
442 tok_buf = typeMalloc(char, TOK_BUF_SIZE);
443
444 #ifdef TRACE
445 old_line = _nc_curr_line;
446 old_col = _nc_curr_col;
447 #endif
448 tok_ptr = tok_buf;
449 AddCh(ch);
450
451 if (first_column) {
452 _nc_comment_start = token_start;
453 _nc_comment_end = _nc_curr_file_pos;
454 _nc_start_line = _nc_curr_line;
455
456 _nc_syntax = ERR;
457 after_name = 0;
458 after_list = 0;
459 while ((ch = next_char()) != '\n') {
460 if (ch == EOF) {
461 _nc_err_abort(MSG_NO_INPUTS);
462 } else if (ch == '|') {
463 after_list = tok_ptr;
464 if (after_name == 0)
465 after_name = tok_ptr;
466 } else if (ch == ':' && last_char() != ',') {
467 _nc_syntax = SYN_TERMCAP;
468 separator = ':';
469 break;
470 } else if (ch == ',') {
471 _nc_syntax = SYN_TERMINFO;
472 separator = ',';
473 /*
474 * If we did not see a '|', then we found a name with no
475 * aliases or description.
476 */
477 if (after_name == 0)
478 break;
479 /*
480 * If we see a comma, we assume this is terminfo unless we
481 * subsequently run into a colon. But we don't stop
482 * looking for a colon until hitting a newline. This
483 * allows commas to be embedded in description fields of
484 * either syntax.
485 */
486 } else
487 ch = eat_escaped_newline(ch);
488
489 if (OkToAdd()) {
490 AddCh(ch);
491 } else {
492 ch = EOF;
493 break;
494 }
495 }
496 *tok_ptr = '\0';
497 if (_nc_syntax == ERR) {
498 /*
499 * Grrr...what we ought to do here is barf, complaining that
500 * the entry is malformed. But because a couple of name fields
501 * in the 8.2 termcap file end with |\, we just have to assume
502 * it's termcap syntax.
503 */
504 _nc_syntax = SYN_TERMCAP;
505 separator = ':';
506 } else if (_nc_syntax == SYN_TERMINFO) {
507 /* throw away trailing /, *$/ */
508 for (--tok_ptr;
509 iswhite(*tok_ptr) || *tok_ptr == ',';
510 tok_ptr--)
511 continue;
512 tok_ptr[1] = '\0';
513 }
514
515 /*
516 * This is the soonest we have the terminal name fetched. Set up
517 * for following warning messages. If there's no '|', then there
518 * is no description.
519 */
520 if (after_name != 0) {
521 ch = *after_name;
522 *after_name = '\0';
523 _nc_set_type(tok_buf);
524 *after_name = (char) ch;
525 }
526
527 /*
528 * Compute the boundary between the aliases and the description
529 * field for syntax-checking purposes.
530 */
531 if (after_list != 0) {
532 if (!silent) {
533 if (*after_list == '\0')
534 _nc_warning("empty longname field");
535 #ifndef FREEBSD_NATIVE
536 else if (strchr(after_list, ' ') == 0)
537 _nc_warning("older tic versions may treat the description field as an alias");
538 #endif
539 }
540 } else {
541 after_list = tok_buf + strlen(tok_buf);
542 DEBUG(1, ("missing description"));
543 }
544
545 /*
546 * Whitespace in a name field other than the long name can confuse
547 * rdist and some termcap tools. Slashes are a no-no. Other
548 * special characters can be dangerous due to shell expansion.
549 */
550 for (s = tok_buf; s < after_list; ++s) {
551 if (isspace(UChar(*s))) {
552 if (!silent)
553 _nc_warning("whitespace in name or alias field");
554 break;
555 } else if (*s == '/') {
556 if (!silent)
557 _nc_warning("slashes aren't allowed in names or aliases");
558 break;
559 } else if (strchr("$[]!*?", *s)) {
560 if (!silent)
561 _nc_warning("dubious character `%c' in name or alias field", *s);
562 break;
563 }
564 }
565
566 _nc_curr_token.tk_name = tok_buf;
567 type = NAMES;
568 } else {
569 if (had_newline && _nc_syntax == SYN_TERMCAP) {
570 _nc_warning("Missing backslash before newline");
571 had_newline = FALSE;
572 }
573 while ((ch = next_char()) != EOF) {
574 if (!isalnum(UChar(ch))) {
575 if (_nc_syntax == SYN_TERMINFO) {
576 if (ch != '_')
577 break;
578 } else { /* allow ';' for "k;" */
579 if (ch != ';')
580 break;
581 }
582 }
583 if (OkToAdd()) {
584 AddCh(ch);
585 } else {
586 ch = EOF;
587 break;
588 }
589 }
590
591 *tok_ptr++ = '\0'; /* separate name/value in buffer */
592 switch (ch) {
593 case ',':
594 case ':':
595 if (ch != separator)
596 _nc_err_abort("Separator inconsistent with syntax");
597 _nc_curr_token.tk_name = tok_buf;
598 type = BOOLEAN;
599 break;
600 case '@':
601 if ((ch = next_char()) != separator && !silent)
602 _nc_warning("Missing separator after `%s', have %s",
603 tok_buf, unctrl((chtype) ch));
604 _nc_curr_token.tk_name = tok_buf;
605 type = CANCEL;
606 break;
607
608 case '#':
609 found = 0;
610 while (isalnum(ch = next_char())) {
611 numbuf[found++] = (char) ch;
612 if (found >= sizeof(numbuf) - 1)
613 break;
614 }
615 numbuf[found] = '\0';
616 number = strtol(numbuf, &numchk, 0);
617 if (!silent) {
618 if (numchk == numbuf)
619 _nc_warning("no value given for `%s'", tok_buf);
620 if ((*numchk != '\0') || (ch != separator))
621 _nc_warning("Missing separator");
622 }
623 _nc_curr_token.tk_name = tok_buf;
624 _nc_curr_token.tk_valnumber = number;
625 type = NUMBER;
626 break;
627
628 case '=':
629 ch = _nc_trans_string(tok_ptr, tok_buf + TOK_BUF_SIZE);
630 if (!silent && ch != separator)
631 _nc_warning("Missing separator");
632 _nc_curr_token.tk_name = tok_buf;
633 _nc_curr_token.tk_valstring = tok_ptr;
634 type = STRING;
635 break;
636
637 case EOF:
638 type = EOF;
639 break;
640 default:
641 /* just to get rid of the compiler warning */
642 type = UNDEF;
643 if (!silent)
644 _nc_warning("Illegal character - '%s'", unctrl((chtype) ch));
645 }
646 } /* end else (first_column == FALSE) */
647 } /* end else (ch != EOF) */
648
649 end_of_token:
650
651 #ifdef TRACE
652 if (dot_flag == TRUE)
653 DEBUG(8, ("Commented out "));
654
655 if (_nc_tracing >= DEBUG_LEVEL(8)) {
656 _tracef("parsed %d.%d to %d.%d",
657 old_line, old_col,
658 _nc_curr_line, _nc_curr_col);
659 }
660 if (_nc_tracing >= DEBUG_LEVEL(7)) {
661 switch (type) {
662 case BOOLEAN:
663 _tracef("Token: Boolean; name='%s'",
664 _nc_curr_token.tk_name);
665 break;
666
667 case NUMBER:
668 _tracef("Token: Number; name='%s', value=%d",
669 _nc_curr_token.tk_name,
670 _nc_curr_token.tk_valnumber);
671 break;
672
673 case STRING:
674 _tracef("Token: String; name='%s', value=%s",
675 _nc_curr_token.tk_name,
676 _nc_visbuf(_nc_curr_token.tk_valstring));
677 break;
678
679 case CANCEL:
680 _tracef("Token: Cancel; name='%s'",
681 _nc_curr_token.tk_name);
682 break;
683
684 case NAMES:
685
686 _tracef("Token: Names; value='%s'",
687 _nc_curr_token.tk_name);
688 break;
689
690 case EOF:
691 _tracef("Token: End of file");
692 break;
693
694 default:
695 _nc_warning("Bad token type");
696 }
697 }
698 #endif
699
700 if (dot_flag == TRUE) /* if commented out, use the next one */
701 type = _nc_get_token(silent);
702
703 DEBUG(3, ("token: `%s', class %d",
704 ((_nc_curr_token.tk_name != 0)
705 ? _nc_curr_token.tk_name
706 : "<null>"),
707 type));
708
709 return (type);
710 }
711
712 /*
713 * char
714 * trans_string(ptr)
715 *
716 * Reads characters using next_char() until encountering a separator, nl,
717 * or end-of-file. The returned value is the character which caused
718 * reading to stop. The following translations are done on the input:
719 *
720 * ^X goes to ctrl-X (i.e. X & 037)
721 * {\E,\n,\r,\b,\t,\f} go to
722 * {ESCAPE,newline,carriage-return,backspace,tab,formfeed}
723 * {\^,\\} go to {carat,backslash}
724 * \ddd (for ddd = up to three octal digits) goes to the character ddd
725 *
726 * \e == \E
727 * \0 == \200
728 *
729 */
730
731 NCURSES_EXPORT(int)
_nc_trans_string(char * ptr,char * last)732 _nc_trans_string(char *ptr, char *last)
733 {
734 int count = 0;
735 int number = 0;
736 int i, c;
737 chtype ch, last_ch = '\0';
738 bool ignored = FALSE;
739 bool long_warning = FALSE;
740
741 while ((ch = c = next_char()) != (chtype) separator && c != EOF) {
742 if (ptr >= (last - 1)) {
743 if (c != EOF) {
744 while ((c = next_char()) != separator && c != EOF) {
745 ;
746 }
747 ch = c;
748 }
749 break;
750 }
751 if ((_nc_syntax == SYN_TERMCAP) && c == '\n')
752 break;
753 if (ch == '^' && last_ch != '%') {
754 ch = c = next_char();
755 if (c == EOF)
756 _nc_err_abort(MSG_NO_INPUTS);
757
758 if (!(is7bits(ch) && isprint(ch))) {
759 _nc_warning("Illegal ^ character - '%s'", unctrl(ch));
760 }
761 if (ch == '?') {
762 *(ptr++) = '\177';
763 if (_nc_tracing)
764 _nc_warning("Allow ^? as synonym for \\177");
765 } else {
766 if ((ch &= 037) == 0)
767 ch = 128;
768 *(ptr++) = (char) (ch);
769 }
770 } else if (ch == '\\') {
771 ch = c = next_char();
772 if (c == EOF)
773 _nc_err_abort(MSG_NO_INPUTS);
774
775 if (ch >= '0' && ch <= '7') {
776 number = ch - '0';
777 for (i = 0; i < 2; i++) {
778 ch = c = next_char();
779 if (c == EOF)
780 _nc_err_abort(MSG_NO_INPUTS);
781
782 if (c < '0' || c > '7') {
783 if (isdigit(c)) {
784 _nc_warning("Non-octal digit `%c' in \\ sequence", c);
785 /* allow the digit; it'll do less harm */
786 } else {
787 push_back((char) c);
788 break;
789 }
790 }
791
792 number = number * 8 + c - '0';
793 }
794
795 if (number == 0)
796 number = 0200;
797 *(ptr++) = (char) number;
798 } else {
799 switch (c) {
800 case 'E':
801 case 'e':
802 *(ptr++) = '\033';
803 break;
804
805 case 'a':
806 *(ptr++) = '\007';
807 break;
808
809 case 'l':
810 case 'n':
811 *(ptr++) = '\n';
812 break;
813
814 case 'r':
815 *(ptr++) = '\r';
816 break;
817
818 case 'b':
819 *(ptr++) = '\010';
820 break;
821
822 case 's':
823 *(ptr++) = ' ';
824 break;
825
826 case 'f':
827 *(ptr++) = '\014';
828 break;
829
830 case 't':
831 *(ptr++) = '\t';
832 break;
833
834 case '\\':
835 *(ptr++) = '\\';
836 break;
837
838 case '^':
839 *(ptr++) = '^';
840 break;
841
842 case ',':
843 *(ptr++) = ',';
844 break;
845
846 case ':':
847 *(ptr++) = ':';
848 break;
849
850 case '\n':
851 continue;
852
853 default:
854 _nc_warning("Illegal character '%s' in \\ sequence",
855 unctrl(ch));
856 /* FALLTHRU */
857 case '|':
858 *(ptr++) = (char) ch;
859 } /* endswitch (ch) */
860 } /* endelse (ch < '0' || ch > '7') */
861 }
862 /* end else if (ch == '\\') */
863 else if (ch == '\n' && (_nc_syntax == SYN_TERMINFO)) {
864 /*
865 * Newlines embedded in a terminfo string are ignored, provided
866 * that the next line begins with whitespace.
867 */
868 ignored = TRUE;
869 } else {
870 *(ptr++) = (char) ch;
871 }
872
873 if (!ignored) {
874 if (_nc_curr_col <= 1) {
875 push_back((char) ch);
876 ch = '\n';
877 break;
878 }
879 last_ch = ch;
880 count++;
881 }
882 ignored = FALSE;
883
884 if (count > MAXCAPLEN && !long_warning) {
885 _nc_warning("Very long string found. Missing separator?");
886 long_warning = TRUE;
887 }
888 } /* end while */
889
890 *ptr = '\0';
891
892 return (ch);
893 }
894
895 /*
896 * _nc_push_token()
897 *
898 * Push a token of given type so that it will be reread by the next
899 * get_token() call.
900 */
901
902 NCURSES_EXPORT(void)
_nc_push_token(int tokclass)903 _nc_push_token(int tokclass)
904 {
905 /*
906 * This implementation is kind of bogus, it will fail if we ever do more
907 * than one pushback at a time between get_token() calls. It relies on the
908 * fact that _nc_curr_token is static storage that nothing but
909 * _nc_get_token() touches.
910 */
911 pushtype = tokclass;
912 if (pushname == 0)
913 pushname = typeMalloc(char, MAX_NAME_SIZE + 1);
914 _nc_get_type(pushname);
915
916 DEBUG(3, ("pushing token: `%s', class %d",
917 ((_nc_curr_token.tk_name != 0)
918 ? _nc_curr_token.tk_name
919 : "<null>"),
920 pushtype));
921 }
922
923 /*
924 * Panic mode error recovery - skip everything until a "ch" is found.
925 */
926 NCURSES_EXPORT(void)
_nc_panic_mode(char ch)927 _nc_panic_mode(char ch)
928 {
929 int c;
930
931 for (;;) {
932 c = next_char();
933 if (c == ch)
934 return;
935 if (c == EOF)
936 return;
937 }
938 }
939
940 #if NO_LEAKS
941 NCURSES_EXPORT(void)
_nc_comp_scan_leaks(void)942 _nc_comp_scan_leaks(void)
943 {
944 if (pushname != 0) {
945 FreeAndNull(pushname);
946 }
947 }
948 #endif
949