Bug Summary

File:src/lib/libcurses/tinfo/comp_scan.c
Warning:line 492, column 7
Value stored to 'ch' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name comp_scan.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libcurses/obj -resource-dir /usr/local/lib/clang/13.0.0 -I . -I /usr/src/lib/libcurses -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libcurses/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/lib/libcurses/tinfo/comp_scan.c
1/* $OpenBSD: comp_scan.c,v 1.15 2010/01/12 23:22:06 nicm Exp $ */
2
3/****************************************************************************
4 * Copyright (c) 1998-2006,2008 Free Software Foundation, Inc. *
5 * *
6 * Permission is hereby granted, free of charge, to any person obtaining a *
7 * copy of this software and associated documentation files (the *
8 * "Software"), to deal in the Software without restriction, including *
9 * without limitation the rights to use, copy, modify, merge, publish, *
10 * distribute, distribute with modifications, sublicense, and/or sell *
11 * copies of the Software, and to permit persons to whom the Software is *
12 * furnished to do so, subject to the following conditions: *
13 * *
14 * The above copyright notice and this permission notice shall be included *
15 * in all copies or substantial portions of the Software. *
16 * *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
24 * *
25 * Except as contained in this notice, the name(s) of the above copyright *
26 * holders shall not be used in advertising or otherwise to promote the *
27 * sale, use or other dealings in this Software without prior written *
28 * authorization. *
29 ****************************************************************************/
30
31/****************************************************************************
32 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
33 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
34 * and: Thomas E. Dickey 1996 on *
35 ****************************************************************************/
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
56MODULE_ID("$Id: comp_scan.c,v 1.15 2010/01/12 23:22:06 nicm 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 MAXCAPLEN600 600
63
64#define iswhite(ch)(ch == ' ' || ch == '\t') (ch == ' ' || ch == '\t')
65
66NCURSES_EXPORT_VAR(int)int
67_nc_syntax = 0; /* termcap or terminfo? */
68NCURSES_EXPORT_VAR(long)long
69_nc_curr_file_pos = 0; /* file offset of current line */
70NCURSES_EXPORT_VAR(long)long
71_nc_comment_start = 0; /* start of comment range before name */
72NCURSES_EXPORT_VAR(long)long
73_nc_comment_end = 0; /* end of comment range before name */
74NCURSES_EXPORT_VAR(long)long
75_nc_start_line = 0; /* start line of current entry */
76
77NCURSES_EXPORT_VAR(struct token)struct token
78_nc_curr_token =
79{
80 0, 0, 0
81};
82
83/*****************************************************************************
84 *
85 * Token-grabbing machinery
86 *
87 *****************************************************************************/
88
89static bool_Bool first_column; /* See 'next_char()' below */
90static bool_Bool had_newline;
91static char separator; /* capability separator */
92static int pushtype; /* type of pushback token */
93static char *pushname;
94
95#if NCURSES_EXT_FUNCS20081102
96NCURSES_EXPORT_VAR(bool)_Bool
97_nc_disable_period = FALSE0; /* used by tic -a option */
98#endif
99
100/*****************************************************************************
101 *
102 * Character-stream handling
103 *
104 *****************************************************************************/
105
106#define LEXBUFSIZ1024 1024
107
108static char *bufptr; /* otherwise, the input buffer pointer */
109static char *bufstart; /* start of buffer so we can compute offsets */
110static 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
120NCURSES_EXPORT(void)void
121_nc_reset_input(FILE *fp, char *buf)
122{
123 pushtype = NO_PUSHBACK-1;
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 */
139static int
140last_char(void)
141{
142 size_t len = strlen(bufptr);
143 while (len--) {
144 if (!isspace(UChar(bufptr[len])((unsigned char)(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
164static int
165next_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)free(result); result = 0;
174 FreeAndNull(pushname)free(pushname); pushname = 0;
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(-1));
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 + (LEXBUFSIZ1024 / 4) >= allocated) {
204 allocated += (allocated + LEXBUFSIZ1024);
205 result = typeRealloc(char, allocated, result)(char *)_nc_doalloc(result, (allocated)*sizeof(char));
206 if (result == 0)
207 return (EOF(-1));
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 strlcat(result, "\n", allocated);
222 }
223 if ((bufptr = bufstart) != 0) {
224 used = strlen(bufptr);
225 while (iswhite(*bufptr)(*bufptr == ' ' || *bufptr == '\t')) {
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(-1));
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 = FALSE0;
258
259 _nc_curr_col++;
260 the_char = *bufptr++;
261 return UChar(the_char)((unsigned char)(the_char));
262}
263
264static void
265push_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
274static long
275stream_pos(void)
276/* return our current character position in the input stream */
277{
278 return (yyin ? ftell(yyin) : (bufptr ? bufptr - bufstart : 0));
279}
280
281static bool_Bool
282end_of_stream(void)
283/* are we at end of input? */
284{
285 return ((yyin ? feof(yyin)(!__isthreaded ? (((yyin)->_flags & 0x0020) != 0) : (feof
)(yyin)) : (bufptr && *bufptr == '\0'))
286 ? TRUE1 : FALSE0);
287}
288
289/* Assume we may be looking at a termcap-style continuation */
290static NCURSES_INLINEinline int
291eat_escaped_newline(int ch)
292{
293 if (ch == '\\')
294 while ((ch = next_char()) == '\n' || iswhite(ch)(ch == ' ' || ch == '\t'))
295 continue;
296 return ch;
297}
298
299#define TOK_BUF_SIZE4096 MAX_ENTRY_SIZE4096
300
301#define OkToAdd()((tok_ptr - tok_buf) < (4096 - 2)) \
302 ((tok_ptr - tok_buf) < (TOK_BUF_SIZE4096 - 2))
303
304#define AddCh(ch)*tok_ptr++ = (char) ch; *tok_ptr = '\0' \
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
341NCURSES_EXPORT(int)int
342_nc_get_token(bool_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 = FALSE0;
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-1) {
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-1;
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)free(tok_buf); tok_buf = 0;
386 }
387 return (EOF(-1));
388 }
389
390 start_token:
391 token_start = stream_pos();
392 while ((ch = next_char()) == '\n' || iswhite(ch)(ch == ' ' || ch == '\t')) {
393 if (ch == '\n')
394 had_newline = TRUE1;
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(-1))
405 type = EOF(-1);
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_FUNCS20081102
413 && !_nc_disable_period
414#endif
415 ) {
416 dot_flag = TRUE1;
417 DEBUG(8, ("dot-flag set"));
418
419 while ((ch = next_char()) == '.' || iswhite(ch)(ch == ' ' || ch == '\t'))
420 continue;
421 }
422
423 if (ch == EOF(-1)) {
424 type = EOF(-1);
425 goto end_of_token;
426 }
427
428 /* have to make some punctuation chars legal for terminfo */
429 if (!isalnum(UChar(ch)((unsigned char)(ch)))
430#if NCURSES_EXT_FUNCS20081102
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)(char *)malloc((4096)*sizeof(char));
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)*tok_ptr++ = (char) ch; *tok_ptr = '\0';
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(-1);
457 after_name = 0;
458 after_list = 0;
459 while ((ch = next_char()) != '\n') {
460 if (ch == EOF(-1)) {
461 _nc_err_abort(MSG_NO_INPUTS"Premature EOF");
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_TERMCAP1;
468 separator = ':';
469 break;
470 } else if (ch == ',') {
471 _nc_syntax = SYN_TERMINFO0;
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()((tok_ptr - tok_buf) < (4096 - 2))) {
490 AddCh(ch)*tok_ptr++ = (char) ch; *tok_ptr = '\0';
491 } else {
492 ch = EOF(-1);
Value stored to 'ch' is never read
493 break;
494 }
495 }
496 *tok_ptr = '\0';
497 if (_nc_syntax == ERR(-1)) {
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_TERMCAP1;
505 separator = ':';
506 } else if (_nc_syntax == SYN_TERMINFO0) {
507 /* throw away trailing /, *$/ */
508 for (--tok_ptr;
509 iswhite(*tok_ptr)(*tok_ptr == ' ' || *tok_ptr == '\t') || *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 else if (strchr(after_list, ' ') == 0)
536 _nc_warning("older tic versions may treat the description field as an alias");
537 }
538 } else {
539 after_list = tok_buf + strlen(tok_buf);
540 DEBUG(1, ("missing description"));
541 }
542
543 /*
544 * Whitespace in a name field other than the long name can confuse
545 * rdist and some termcap tools. Slashes are a no-no. Other
546 * special characters can be dangerous due to shell expansion.
547 */
548 for (s = tok_buf; s < after_list; ++s) {
549 if (isspace(UChar(*s)((unsigned char)(*s)))) {
550 if (!silent)
551 _nc_warning("whitespace in name or alias field");
552 break;
553 } else if (*s == '/') {
554 if (!silent)
555 _nc_warning("slashes aren't allowed in names or aliases");
556 break;
557 } else if (strchr("$[]!*?", *s)) {
558 if (!silent)
559 _nc_warning("dubious character `%c' in name or alias field", *s);
560 break;
561 }
562 }
563
564 _nc_curr_token.tk_name = tok_buf;
565 type = NAMES4;
566 } else {
567 if (had_newline && _nc_syntax == SYN_TERMCAP1) {
568 _nc_warning("Missing backslash before newline");
569 had_newline = FALSE0;
570 }
571 while ((ch = next_char()) != EOF(-1)) {
572 if (!isalnum(UChar(ch)((unsigned char)(ch)))) {
573 if (_nc_syntax == SYN_TERMINFO0) {
574 if (ch != '_')
575 break;
576 } else { /* allow ';' for "k;" */
577 if (ch != ';')
578 break;
579 }
580 }
581 if (OkToAdd()((tok_ptr - tok_buf) < (4096 - 2))) {
582 AddCh(ch)*tok_ptr++ = (char) ch; *tok_ptr = '\0';
583 } else {
584 ch = EOF(-1);
585 break;
586 }
587 }
588
589 *tok_ptr++ = '\0'; /* separate name/value in buffer */
590 switch (ch) {
591 case ',':
592 case ':':
593 if (ch != separator)
594 _nc_err_abort("Separator inconsistent with syntax");
595 _nc_curr_token.tk_name = tok_buf;
596 type = BOOLEAN0;
597 break;
598 case '@':
599 if ((ch = next_char()) != separator && !silent)
600 _nc_warning("Missing separator after `%s', have %s",
601 tok_buf, unctrl((chtype) ch));
602 _nc_curr_token.tk_name = tok_buf;
603 type = CANCEL3;
604 break;
605
606 case '#':
607 found = 0;
608 while (isalnum(ch = next_char())) {
609 numbuf[found++] = (char) ch;
610 if (found >= sizeof(numbuf) - 1)
611 break;
612 }
613 numbuf[found] = '\0';
614 number = strtol(numbuf, &numchk, 0);
615 if (!silent) {
616 if (numchk == numbuf)
617 _nc_warning("no value given for `%s'", tok_buf);
618 if ((*numchk != '\0') || (ch != separator))
619 _nc_warning("Missing separator");
620 }
621 _nc_curr_token.tk_name = tok_buf;
622 _nc_curr_token.tk_valnumber = number;
623 type = NUMBER1;
624 break;
625
626 case '=':
627 ch = _nc_trans_string(tok_ptr, tok_buf + TOK_BUF_SIZE4096);
628 if (!silent && ch != separator)
629 _nc_warning("Missing separator");
630 _nc_curr_token.tk_name = tok_buf;
631 _nc_curr_token.tk_valstring = tok_ptr;
632 type = STRING2;
633 break;
634
635 case EOF(-1):
636 type = EOF(-1);
637 break;
638 default:
639 /* just to get rid of the compiler warning */
640 type = UNDEF5;
641 if (!silent)
642 _nc_warning("Illegal character - '%s'", unctrl((chtype) ch));
643 }
644 } /* end else (first_column == FALSE) */
645 } /* end else (ch != EOF) */
646
647 end_of_token:
648
649#ifdef TRACE
650 if (dot_flag == TRUE1)
651 DEBUG(8, ("Commented out "));
652
653 if (_nc_tracing >= DEBUG_LEVEL(8)((8) << 13)) {
654 _tracef("parsed %d.%d to %d.%d",
655 old_line, old_col,
656 _nc_curr_line, _nc_curr_col);
657 }
658 if (_nc_tracing >= DEBUG_LEVEL(7)((7) << 13)) {
659 switch (type) {
660 case BOOLEAN0:
661 _tracef("Token: Boolean; name='%s'",
662 _nc_curr_token.tk_name);
663 break;
664
665 case NUMBER1:
666 _tracef("Token: Number; name='%s', value=%d",
667 _nc_curr_token.tk_name,
668 _nc_curr_token.tk_valnumber);
669 break;
670
671 case STRING2:
672 _tracef("Token: String; name='%s', value=%s",
673 _nc_curr_token.tk_name,
674 _nc_visbuf(_nc_curr_token.tk_valstring));
675 break;
676
677 case CANCEL3:
678 _tracef("Token: Cancel; name='%s'",
679 _nc_curr_token.tk_name);
680 break;
681
682 case NAMES4:
683
684 _tracef("Token: Names; value='%s'",
685 _nc_curr_token.tk_name);
686 break;
687
688 case EOF(-1):
689 _tracef("Token: End of file");
690 break;
691
692 default:
693 _nc_warning("Bad token type");
694 }
695 }
696#endif
697
698 if (dot_flag == TRUE1) /* if commented out, use the next one */
699 type = _nc_get_token(silent);
700
701 DEBUG(3, ("token: `%s', class %d",
702 ((_nc_curr_token.tk_name != 0)
703 ? _nc_curr_token.tk_name
704 : "<null>"),
705 type));
706
707 return (type);
708}
709
710/*
711 * char
712 * trans_string(ptr)
713 *
714 * Reads characters using next_char() until encountering a separator, nl,
715 * or end-of-file. The returned value is the character which caused
716 * reading to stop. The following translations are done on the input:
717 *
718 * ^X goes to ctrl-X (i.e. X & 037)
719 * {\E,\n,\r,\b,\t,\f} go to
720 * {ESCAPE,newline,carriage-return,backspace,tab,formfeed}
721 * {\^,\\} go to {carat,backslash}
722 * \ddd (for ddd = up to three octal digits) goes to the character ddd
723 *
724 * \e == \E
725 * \0 == \200
726 *
727 */
728
729NCURSES_EXPORT(int)int
730_nc_trans_string(char *ptr, char *last)
731{
732 int count = 0;
733 int number = 0;
734 int i, c;
735 chtype ch, last_ch = '\0';
736 bool_Bool ignored = FALSE0;
737 bool_Bool long_warning = FALSE0;
738
739 while ((ch = c = next_char()) != (chtype) separator && c != EOF(-1)) {
740 if (ptr >= (last - 1)) {
741 if (c != EOF(-1)) {
742 while ((c = next_char()) != separator && c != EOF(-1)) {
743 ;
744 }
745 ch = c;
746 }
747 break;
748 }
749 if ((_nc_syntax == SYN_TERMCAP1) && c == '\n')
750 break;
751 if (ch == '^' && last_ch != '%') {
752 ch = c = next_char();
753 if (c == EOF(-1))
754 _nc_err_abort(MSG_NO_INPUTS"Premature EOF");
755
756 if (!(is7bits(ch)((unsigned)(ch) < 128) && isprint(ch))) {
757 _nc_warning("Illegal ^ character - '%s'", unctrl(ch));
758 }
759 if (ch == '?') {
760 *(ptr++) = '\177';
761 if (_nc_tracing)
762 _nc_warning("Allow ^? as synonym for \\177");
763 } else {
764 if ((ch &= 037) == 0)
765 ch = 128;
766 *(ptr++) = (char) (ch);
767 }
768 } else if (ch == '\\') {
769 ch = c = next_char();
770 if (c == EOF(-1))
771 _nc_err_abort(MSG_NO_INPUTS"Premature EOF");
772
773 if (ch >= '0' && ch <= '7') {
774 number = ch - '0';
775 for (i = 0; i < 2; i++) {
776 ch = c = next_char();
777 if (c == EOF(-1))
778 _nc_err_abort(MSG_NO_INPUTS"Premature EOF");
779
780 if (c < '0' || c > '7') {
781 if (isdigit(c)) {
782 _nc_warning("Non-octal digit `%c' in \\ sequence", c);
783 /* allow the digit; it'll do less harm */
784 } else {
785 push_back((char) c);
786 break;
787 }
788 }
789
790 number = number * 8 + c - '0';
791 }
792
793 if (number == 0)
794 number = 0200;
795 *(ptr++) = (char) number;
796 } else {
797 switch (c) {
798 case 'E':
799 case 'e':
800 *(ptr++) = '\033';
801 break;
802
803 case 'a':
804 *(ptr++) = '\007';
805 break;
806
807 case 'l':
808 case 'n':
809 *(ptr++) = '\n';
810 break;
811
812 case 'r':
813 *(ptr++) = '\r';
814 break;
815
816 case 'b':
817 *(ptr++) = '\010';
818 break;
819
820 case 's':
821 *(ptr++) = ' ';
822 break;
823
824 case 'f':
825 *(ptr++) = '\014';
826 break;
827
828 case 't':
829 *(ptr++) = '\t';
830 break;
831
832 case '\\':
833 *(ptr++) = '\\';
834 break;
835
836 case '^':
837 *(ptr++) = '^';
838 break;
839
840 case ',':
841 *(ptr++) = ',';
842 break;
843
844 case ':':
845 *(ptr++) = ':';
846 break;
847
848 case '\n':
849 continue;
850
851 default:
852 _nc_warning("Illegal character '%s' in \\ sequence",
853 unctrl(ch));
854 /* FALLTHRU */
855 case '|':
856 *(ptr++) = (char) ch;
857 } /* endswitch (ch) */
858 } /* endelse (ch < '0' || ch > '7') */
859 }
860 /* end else if (ch == '\\') */
861 else if (ch == '\n' && (_nc_syntax == SYN_TERMINFO0)) {
862 /*
863 * Newlines embedded in a terminfo string are ignored, provided
864 * that the next line begins with whitespace.
865 */
866 ignored = TRUE1;
867 } else {
868 *(ptr++) = (char) ch;
869 }
870
871 if (!ignored) {
872 if (_nc_curr_col <= 1) {
873 push_back((char) ch);
874 ch = '\n';
875 break;
876 }
877 last_ch = ch;
878 count++;
879 }
880 ignored = FALSE0;
881
882 if (count > MAXCAPLEN600 && !long_warning) {
883 _nc_warning("Very long string found. Missing separator?");
884 long_warning = TRUE1;
885 }
886 } /* end while */
887
888 *ptr = '\0';
889
890 return (ch);
891}
892
893/*
894 * _nc_push_token()
895 *
896 * Push a token of given type so that it will be reread by the next
897 * get_token() call.
898 */
899
900NCURSES_EXPORT(void)void
901_nc_push_token(int tokclass)
902{
903 /*
904 * This implementation is kind of bogus, it will fail if we ever do more
905 * than one pushback at a time between get_token() calls. It relies on the
906 * fact that _nc_curr_token is static storage that nothing but
907 * _nc_get_token() touches.
908 */
909 pushtype = tokclass;
910 if (pushname == 0)
911 pushname = typeMalloc(char, MAX_NAME_SIZE + 1)(char *)malloc((512 + 1)*sizeof(char));
912 _nc_get_type(pushname);
913
914 DEBUG(3, ("pushing token: `%s', class %d",
915 ((_nc_curr_token.tk_name != 0)
916 ? _nc_curr_token.tk_name
917 : "<null>"),
918 pushtype));
919}
920
921/*
922 * Panic mode error recovery - skip everything until a "ch" is found.
923 */
924NCURSES_EXPORT(void)void
925_nc_panic_mode(char ch)
926{
927 int c;
928
929 for (;;) {
930 c = next_char();
931 if (c == ch)
932 return;
933 if (c == EOF(-1))
934 return;
935 }
936}
937
938#if NO_LEAKS0
939NCURSES_EXPORT(void)void
940_nc_comp_scan_leaks(void)
941{
942 if (pushname != 0) {
943 FreeAndNull(pushname)free(pushname); pushname = 0;
944 }
945}
946#endif