]>
Commit | Line | Data |
---|---|---|
cce855bc JA |
1 | /* redir.c -- Functions to perform input and output redirection. */ |
2 | ||
74091dd4 | 3 | /* Copyright (C) 1997-2021 Free Software Foundation, Inc. |
cce855bc JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
cce855bc | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
cce855bc JA |
16 | |
17 | You should have received a copy of the GNU General Public License | |
3185942a JA |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. |
19 | */ | |
20 | ||
cce855bc JA |
21 | #include "config.h" |
22 | ||
23 | #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX) | |
24 | #pragma alloca | |
25 | #endif /* _AIX && RISC6000 && !__GNUC__ */ | |
26 | ||
27 | #include <stdio.h> | |
28 | #include "bashtypes.h" | |
b80f6443 | 29 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
cce855bc JA |
30 | # include <sys/file.h> |
31 | #endif | |
32 | #include "filecntl.h" | |
33 | #include "posixstat.h" | |
34 | ||
35 | #if defined (HAVE_UNISTD_H) | |
36 | # include <unistd.h> | |
37 | #endif | |
38 | ||
39 | #include <errno.h> | |
40 | ||
41 | #if !defined (errno) | |
42 | extern int errno; | |
43 | #endif | |
44 | ||
45 | #include "bashansi.h" | |
b80f6443 | 46 | #include "bashintl.h" |
cce855bc | 47 | #include "memalloc.h" |
3185942a JA |
48 | |
49 | #define NEED_FPURGE_DECL | |
50 | ||
cce855bc JA |
51 | #include "shell.h" |
52 | #include "flags.h" | |
53 | #include "execute_cmd.h" | |
54 | #include "redir.h" | |
a0c0a00f | 55 | #include "trap.h" |
cce855bc JA |
56 | |
57 | #if defined (BUFFERED_INPUT) | |
58 | # include "input.h" | |
59 | #endif | |
60 | ||
8868edaf CR |
61 | #include "builtins/pipesize.h" |
62 | ||
63 | /* FreeBSD 13 can reliably handle atomic writes at this capacity without | |
64 | hanging. */ | |
65 | #if __FreeBSD__ && !defined (HEREDOC_PIPESIZE) | |
66 | # define HEREDOC_PIPESIZE 4096 | |
67 | #endif | |
68 | ||
69 | /* Normally set by a build process command that computes pipe capacity */ | |
70 | #ifndef PIPESIZE | |
71 | # ifdef PIPE_BUF | |
72 | # define PIPESIZE PIPE_BUF | |
73 | # else | |
74 | # define PIPESIZE 4096 | |
75 | # endif | |
76 | #endif | |
77 | ||
78 | #ifndef HEREDOC_PIPESIZE | |
79 | # define HEREDOC_PIPESIZE PIPESIZE | |
80 | #endif | |
81 | ||
82 | #if defined (HEREDOC_PIPEMAX) | |
83 | # if HEREDOC_PIPESIZE > HEREDOC_PIPEMAX | |
84 | # define HEREDOC_PIPESIZE HEREDOC_PIPEMAX | |
85 | # endif | |
86 | #endif | |
87 | ||
3185942a JA |
88 | #define SHELL_FD_BASE 10 |
89 | ||
b80f6443 | 90 | int expanding_redir; |
74091dd4 | 91 | int varassign_redir_autoclose = 0; |
b80f6443 | 92 | |
cce855bc JA |
93 | extern REDIRECT *redirection_undo_list; |
94 | extern REDIRECT *exec_redirection_undo_list; | |
95 | ||
96 | /* Static functions defined and used in this file. */ | |
8868edaf CR |
97 | static void add_exec_redirect PARAMS((REDIRECT *)); |
98 | static int add_undo_redirect PARAMS((int, enum r_instruction, int)); | |
99 | static int add_undo_close_redirect PARAMS((int)); | |
100 | static int expandable_redirection_filename PARAMS((REDIRECT *)); | |
101 | static int stdin_redirection PARAMS((enum r_instruction, int)); | |
102 | static int undoablefd PARAMS((int)); | |
103 | static int do_redirection_internal PARAMS((REDIRECT *, int, char **)); | |
f73dda09 | 104 | |
8868edaf CR |
105 | static char *heredoc_expand PARAMS((WORD_DESC *, enum r_instruction, size_t *)); |
106 | static int heredoc_write PARAMS((int, char *, size_t)); | |
107 | static int here_document_to_fd PARAMS((WORD_DESC *, enum r_instruction)); | |
f73dda09 | 108 | |
8868edaf CR |
109 | static int redir_special_open PARAMS((int, char *, int, int, enum r_instruction)); |
110 | static int noclobber_open PARAMS((char *, int, int, enum r_instruction)); | |
111 | static int redir_open PARAMS((char *, int, int, enum r_instruction)); | |
cce855bc | 112 | |
8868edaf CR |
113 | static int redir_varassign PARAMS((REDIRECT *, int)); |
114 | static int redir_varvalue PARAMS((REDIRECT *)); | |
0001803f | 115 | |
7117c2d2 JA |
116 | /* Spare redirector used when translating [N]>&WORD[-] or [N]<&WORD[-] to |
117 | a new redirection and when creating the redirection undo list. */ | |
cce855bc JA |
118 | static REDIRECTEE rd; |
119 | ||
120 | /* Set to errno when a here document cannot be created for some reason. | |
121 | Used to print a reasonable error message. */ | |
122 | static int heredoc_errno; | |
123 | ||
495aee44 CR |
124 | #define REDIRECTION_ERROR(r, e, fd) \ |
125 | do { \ | |
126 | if ((r) < 0) \ | |
127 | { \ | |
128 | if (fd >= 0) \ | |
129 | close (fd); \ | |
8868edaf | 130 | set_exit_status (EXECUTION_FAILURE);\ |
495aee44 CR |
131 | return ((e) == 0 ? EINVAL : (e));\ |
132 | } \ | |
133 | } while (0) | |
134 | ||
cce855bc | 135 | void |
8868edaf | 136 | redirection_error (temp, error, fn) |
cce855bc JA |
137 | REDIRECT *temp; |
138 | int error; | |
8868edaf | 139 | char *fn; /* already-expanded filename */ |
cce855bc | 140 | { |
f73dda09 | 141 | char *filename, *allocname; |
bb70624e | 142 | int oflags; |
cce855bc | 143 | |
f73dda09 | 144 | allocname = 0; |
a0c0a00f | 145 | if ((temp->rflags & REDIR_VARASSIGN) && error < 0) |
ac50fbac | 146 | filename = allocname = savestring (temp->redirector.filename->word); |
a0c0a00f | 147 | else if ((temp->rflags & REDIR_VARASSIGN) == 0 && temp->redirector.dest < 0) |
f73dda09 JA |
148 | /* This can happen when read_token_word encounters overflow, like in |
149 | exec 4294967297>x */ | |
b80f6443 | 150 | filename = _("file descriptor out of range"); |
f73dda09 | 151 | #ifdef EBADF |
3185942a | 152 | /* This error can never involve NOCLOBBER */ |
0001803f | 153 | else if (error != NOCLOBBER_REDIRECT && temp->redirector.dest >= 0 && error == EBADF) |
7117c2d2 JA |
154 | { |
155 | /* If we're dealing with two file descriptors, we have to guess about | |
156 | which one is invalid; in the cases of r_{duplicating,move}_input and | |
157 | r_{duplicating,move}_output we're here because dup2() failed. */ | |
158 | switch (temp->instruction) | |
159 | { | |
160 | case r_duplicating_input: | |
161 | case r_duplicating_output: | |
162 | case r_move_input: | |
163 | case r_move_output: | |
164 | filename = allocname = itos (temp->redirectee.dest); | |
165 | break; | |
0001803f CR |
166 | case r_duplicating_input_word: |
167 | if (temp->redirector.dest == 0) /* Guess */ | |
168 | filename = temp->redirectee.filename->word; /* XXX */ | |
169 | else | |
170 | filename = allocname = itos (temp->redirector.dest); | |
171 | break; | |
172 | case r_duplicating_output_word: | |
173 | if (temp->redirector.dest == 1) /* Guess */ | |
174 | filename = temp->redirectee.filename->word; /* XXX */ | |
175 | else | |
176 | filename = allocname = itos (temp->redirector.dest); | |
177 | break; | |
7117c2d2 | 178 | default: |
0001803f | 179 | filename = allocname = itos (temp->redirector.dest); |
7117c2d2 JA |
180 | break; |
181 | } | |
182 | } | |
f73dda09 | 183 | #endif |
8868edaf CR |
184 | else if (fn) |
185 | filename = fn; | |
f73dda09 | 186 | else if (expandable_redirection_filename (temp)) |
cce855bc | 187 | { |
ac50fbac | 188 | oflags = temp->redirectee.filename->flags; |
bb70624e | 189 | if (posixly_correct && interactive_shell == 0) |
ac50fbac CR |
190 | temp->redirectee.filename->flags |= W_NOGLOB; |
191 | temp->redirectee.filename->flags |= W_NOCOMSUB; | |
f73dda09 | 192 | filename = allocname = redirection_expand (temp->redirectee.filename); |
ac50fbac | 193 | temp->redirectee.filename->flags = oflags; |
cce855bc | 194 | if (filename == 0) |
f73dda09 | 195 | filename = temp->redirectee.filename->word; |
cce855bc | 196 | } |
f73dda09 | 197 | else if (temp->redirectee.dest < 0) |
ac50fbac | 198 | filename = _("file descriptor out of range"); |
cce855bc | 199 | else |
f73dda09 | 200 | filename = allocname = itos (temp->redirectee.dest); |
cce855bc JA |
201 | |
202 | switch (error) | |
203 | { | |
204 | case AMBIGUOUS_REDIRECT: | |
b80f6443 | 205 | internal_error (_("%s: ambiguous redirect"), filename); |
cce855bc JA |
206 | break; |
207 | ||
208 | case NOCLOBBER_REDIRECT: | |
b80f6443 | 209 | internal_error (_("%s: cannot overwrite existing file"), filename); |
cce855bc JA |
210 | break; |
211 | ||
212 | #if defined (RESTRICTED_SHELL) | |
213 | case RESTRICTED_REDIRECT: | |
b80f6443 | 214 | internal_error (_("%s: restricted: cannot redirect output"), filename); |
cce855bc JA |
215 | break; |
216 | #endif /* RESTRICTED_SHELL */ | |
217 | ||
218 | case HEREDOC_REDIRECT: | |
3185942a | 219 | internal_error (_("cannot create temp file for here-document: %s"), strerror (heredoc_errno)); |
cce855bc JA |
220 | break; |
221 | ||
0001803f CR |
222 | case BADVAR_REDIRECT: |
223 | internal_error (_("%s: cannot assign fd to variable"), filename); | |
224 | break; | |
225 | ||
cce855bc JA |
226 | default: |
227 | internal_error ("%s: %s", filename, strerror (error)); | |
228 | break; | |
229 | } | |
230 | ||
f73dda09 | 231 | FREE (allocname); |
cce855bc JA |
232 | } |
233 | ||
b80f6443 JA |
234 | /* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually |
235 | make input and output file descriptors, otherwise just do whatever is | |
ac50fbac | 236 | necessary for side effecting. flags & RX_UNDOABLE says to remember |
b80f6443 JA |
237 | how to undo the redirections later, if non-zero. If flags & RX_CLEXEC |
238 | is non-zero, file descriptors opened in do_redirection () have their | |
239 | close-on-exec flag set. */ | |
cce855bc | 240 | int |
b80f6443 | 241 | do_redirections (list, flags) |
cce855bc | 242 | REDIRECT *list; |
b80f6443 | 243 | int flags; |
cce855bc JA |
244 | { |
245 | int error; | |
246 | REDIRECT *temp; | |
8868edaf | 247 | char *fn; |
cce855bc | 248 | |
b80f6443 | 249 | if (flags & RX_UNDOABLE) |
cce855bc JA |
250 | { |
251 | if (redirection_undo_list) | |
252 | { | |
253 | dispose_redirects (redirection_undo_list); | |
254 | redirection_undo_list = (REDIRECT *)NULL; | |
255 | } | |
256 | if (exec_redirection_undo_list) | |
257 | dispose_exec_redirects (); | |
258 | } | |
259 | ||
260 | for (temp = list; temp; temp = temp->next) | |
261 | { | |
8868edaf CR |
262 | fn = 0; |
263 | error = do_redirection_internal (temp, flags, &fn); | |
cce855bc JA |
264 | if (error) |
265 | { | |
8868edaf CR |
266 | redirection_error (temp, error, fn); |
267 | FREE (fn); | |
cce855bc JA |
268 | return (error); |
269 | } | |
8868edaf | 270 | FREE (fn); |
cce855bc JA |
271 | } |
272 | return (0); | |
273 | } | |
274 | ||
275 | /* Return non-zero if the redirection pointed to by REDIRECT has a | |
276 | redirectee.filename that can be expanded. */ | |
277 | static int | |
278 | expandable_redirection_filename (redirect) | |
279 | REDIRECT *redirect; | |
280 | { | |
281 | switch (redirect->instruction) | |
282 | { | |
283 | case r_output_direction: | |
284 | case r_appending_to: | |
285 | case r_input_direction: | |
286 | case r_inputa_direction: | |
287 | case r_err_and_out: | |
3185942a | 288 | case r_append_err_and_out: |
cce855bc JA |
289 | case r_input_output: |
290 | case r_output_force: | |
291 | case r_duplicating_input_word: | |
292 | case r_duplicating_output_word: | |
7117c2d2 JA |
293 | case r_move_input_word: |
294 | case r_move_output_word: | |
cce855bc JA |
295 | return 1; |
296 | ||
297 | default: | |
298 | return 0; | |
299 | } | |
300 | } | |
301 | ||
302 | /* Expand the word in WORD returning a string. If WORD expands to | |
303 | multiple words (or no words), then return NULL. */ | |
304 | char * | |
305 | redirection_expand (word) | |
306 | WORD_DESC *word; | |
307 | { | |
308 | char *result; | |
309 | WORD_LIST *tlist1, *tlist2; | |
bb70624e | 310 | WORD_DESC *w; |
ac50fbac | 311 | int old; |
bb70624e JA |
312 | |
313 | w = copy_word (word); | |
314 | if (posixly_correct) | |
315 | w->flags |= W_NOSPLIT; | |
cce855bc | 316 | |
bb70624e | 317 | tlist1 = make_word_list (w, (WORD_LIST *)NULL); |
b80f6443 | 318 | expanding_redir = 1; |
ac50fbac CR |
319 | /* Now that we've changed the variable search order to ignore the temp |
320 | environment, see if we need to change the cached IFS values. */ | |
321 | sv_ifs ("IFS"); | |
cce855bc | 322 | tlist2 = expand_words_no_vars (tlist1); |
b80f6443 | 323 | expanding_redir = 0; |
ac50fbac CR |
324 | /* Now we need to change the variable search order back to include the temp |
325 | environment. We force the temp environment search by forcing | |
326 | executing_builtin to 1. This is what makes `read' get the right values | |
327 | for the IFS-related cached variables, for example. */ | |
328 | old = executing_builtin; | |
329 | executing_builtin = 1; | |
330 | sv_ifs ("IFS"); | |
331 | executing_builtin = old; | |
cce855bc JA |
332 | dispose_words (tlist1); |
333 | ||
ac50fbac | 334 | if (tlist2 == 0 || tlist2->next) |
cce855bc JA |
335 | { |
336 | /* We expanded to no words, or to more than a single word. | |
337 | Dispose of the word list and return NULL. */ | |
338 | if (tlist2) | |
339 | dispose_words (tlist2); | |
340 | return ((char *)NULL); | |
341 | } | |
342 | result = string_list (tlist2); /* XXX savestring (tlist2->word->word)? */ | |
343 | dispose_words (tlist2); | |
344 | return (result); | |
345 | } | |
346 | ||
8868edaf CR |
347 | /* Expand a here-document or here-string (determined by RI) contained in |
348 | REDIRECTEE and return the expanded document. If LENP is non-zero, put | |
349 | the length of the returned string into *LENP. | |
350 | ||
351 | This captures everything about expanding here-documents and here-strings: | |
352 | the returned document should be written directly to whatever file | |
353 | descriptor is specified. In particular, it adds a newline to the end of | |
354 | a here-string to preserve previous semantics. */ | |
355 | static char * | |
356 | heredoc_expand (redirectee, ri, lenp) | |
7117c2d2 | 357 | WORD_DESC *redirectee; |
8868edaf CR |
358 | enum r_instruction ri; |
359 | size_t *lenp; | |
7117c2d2 | 360 | { |
8868edaf CR |
361 | char *document; |
362 | size_t dlen; | |
363 | int old; | |
364 | ||
365 | if (redirectee->word == 0 || redirectee->word[0] == '\0') | |
366 | { | |
367 | if (lenp) | |
368 | *lenp = 0; | |
369 | return (redirectee->word); | |
370 | } | |
7117c2d2 | 371 | |
8868edaf CR |
372 | /* Quoted here documents are not expanded */ |
373 | if (ri != r_reading_string && (redirectee->flags & W_QUOTED)) | |
374 | { | |
375 | if (lenp) | |
376 | *lenp = STRLEN (redirectee->word); | |
377 | return (redirectee->word); | |
378 | } | |
379 | ||
0001803f | 380 | expanding_redir = 1; |
ac50fbac CR |
381 | /* Now that we've changed the variable search order to ignore the temp |
382 | environment, see if we need to change the cached IFS values. */ | |
383 | sv_ifs ("IFS"); | |
8868edaf CR |
384 | document = (ri == r_reading_string) ? expand_assignment_string_to_string (redirectee->word, 0) |
385 | : expand_string_to_string (redirectee->word, Q_HERE_DOCUMENT); | |
0001803f | 386 | expanding_redir = 0; |
ac50fbac CR |
387 | /* Now we need to change the variable search order back to include the temp |
388 | environment. We force the temp environment search by forcing | |
389 | executing_builtin to 1. This is what makes `read' get the right values | |
390 | for the IFS-related cached variables, for example. */ | |
391 | old = executing_builtin; | |
392 | executing_builtin = 1; | |
393 | sv_ifs ("IFS"); | |
394 | executing_builtin = old; | |
395 | ||
8868edaf CR |
396 | dlen = STRLEN (document); |
397 | /* XXX - Add trailing newline to here-string */ | |
398 | if (ri == r_reading_string) | |
7117c2d2 | 399 | { |
8868edaf CR |
400 | document = xrealloc (document, dlen + 2); |
401 | document[dlen++] = '\n'; | |
402 | document[dlen] = '\0'; | |
7117c2d2 | 403 | } |
8868edaf CR |
404 | if (lenp) |
405 | *lenp = dlen; | |
406 | ||
407 | return document; | |
408 | } | |
409 | ||
410 | /* Write HEREDOC (of length HDLEN) to FD, returning 0 on success and ERRNO on | |
411 | error. Don't handle interrupts. */ | |
412 | static int | |
413 | heredoc_write (fd, heredoc, herelen) | |
414 | int fd; | |
415 | char *heredoc; | |
416 | size_t herelen; | |
417 | { | |
418 | ssize_t nw; | |
419 | int e; | |
420 | ||
421 | errno = 0; | |
422 | nw = write (fd, heredoc, herelen); | |
7117c2d2 | 423 | e = errno; |
8868edaf | 424 | if (nw != herelen) |
7117c2d2 JA |
425 | { |
426 | if (e == 0) | |
427 | e = ENOSPC; | |
428 | return e; | |
429 | } | |
430 | return 0; | |
8868edaf | 431 | } |
7117c2d2 | 432 | |
8868edaf CR |
433 | /* Create a temporary file or pipe holding the text of the here document |
434 | pointed to by REDIRECTEE, and return a file descriptor open for reading | |
435 | to it. Return -1 on any error, and make sure errno is set appropriately. */ | |
cce855bc | 436 | static int |
8868edaf | 437 | here_document_to_fd (redirectee, ri) |
cce855bc | 438 | WORD_DESC *redirectee; |
8868edaf | 439 | enum r_instruction ri; |
cce855bc | 440 | { |
8868edaf CR |
441 | char *filename; |
442 | int r, fd, fd2, herepipe[2]; | |
cce855bc | 443 | char *document; |
8868edaf CR |
444 | size_t document_len; |
445 | #if HEREDOC_PARANOID | |
446 | struct stat st1, st2; | |
447 | #endif | |
cce855bc | 448 | |
8868edaf CR |
449 | /* Expand the here-document/here-string first and then decide what to do. */ |
450 | document = heredoc_expand (redirectee, ri, &document_len); | |
cce855bc | 451 | |
8868edaf CR |
452 | /* If we have a zero-length document, don't mess with a temp file */ |
453 | if (document_len == 0) | |
cce855bc | 454 | { |
8868edaf CR |
455 | fd = open ("/dev/null", O_RDONLY); |
456 | r = errno; | |
457 | if (document != redirectee->word) | |
458 | FREE (document); | |
459 | errno = r; | |
460 | return fd; | |
cce855bc JA |
461 | } |
462 | ||
74091dd4 CR |
463 | if (shell_compatibility_level <= 50) |
464 | goto use_tempfile; | |
465 | ||
466 | #if HEREDOC_PIPESIZE | |
8868edaf CR |
467 | /* Try to use a pipe internal to this process if the document is shorter |
468 | than the system's pipe capacity (computed at build time). We want to | |
469 | write the entire document without write blocking. */ | |
470 | if (document_len <= HEREDOC_PIPESIZE) | |
cce855bc | 471 | { |
8868edaf | 472 | if (pipe (herepipe) < 0) |
cce855bc | 473 | { |
74091dd4 | 474 | /* XXX - goto use_tempfile; ? */ |
8868edaf CR |
475 | r = errno; |
476 | if (document != redirectee->word) | |
477 | free (document); | |
478 | errno = r; | |
479 | return (-1); | |
cce855bc | 480 | } |
8868edaf CR |
481 | |
482 | #if defined (F_GETPIPE_SZ) | |
483 | if (fcntl (herepipe[1], F_GETPIPE_SZ, 0) < document_len) | |
484 | goto use_tempfile; | |
485 | #endif | |
486 | ||
487 | r = heredoc_write (herepipe[1], document, document_len); | |
488 | if (document != redirectee->word) | |
489 | free (document); | |
490 | close (herepipe[1]); | |
491 | if (r) /* write error */ | |
f73dda09 | 492 | { |
8868edaf CR |
493 | close (herepipe[0]); |
494 | errno = r; | |
495 | return (-1); | |
f73dda09 | 496 | } |
8868edaf | 497 | return (herepipe[0]); |
cce855bc | 498 | } |
8868edaf | 499 | #endif |
cce855bc | 500 | |
8868edaf | 501 | use_tempfile: |
cce855bc | 502 | |
3185942a | 503 | fd = sh_mktmpfd ("sh-thd", MT_USERANDOM|MT_USETMPDIR, &filename); |
cce855bc JA |
504 | |
505 | /* If we failed for some reason other than the file existing, abort */ | |
506 | if (fd < 0) | |
28ef6c31 | 507 | { |
8868edaf | 508 | r = errno; |
28ef6c31 | 509 | FREE (filename); |
8868edaf CR |
510 | if (document != redirectee->word) |
511 | FREE (document); | |
512 | errno = r; | |
28ef6c31 JA |
513 | return (fd); |
514 | } | |
cce855bc | 515 | |
d233b485 | 516 | fchmod (fd, S_IRUSR | S_IWUSR); |
1aef9c7b CR |
517 | SET_CLOSE_ON_EXEC (fd); |
518 | ||
cce855bc | 519 | errno = r = 0; /* XXX */ |
8868edaf CR |
520 | r = heredoc_write (fd, document, document_len); |
521 | if (document != redirectee->word) | |
522 | FREE (document); | |
cce855bc | 523 | |
cce855bc JA |
524 | if (r) |
525 | { | |
bb70624e | 526 | close (fd); |
cce855bc | 527 | unlink (filename); |
28ef6c31 | 528 | free (filename); |
cce855bc JA |
529 | errno = r; |
530 | return (-1); | |
531 | } | |
532 | ||
bb70624e JA |
533 | /* In an attempt to avoid races, we close the first fd only after opening |
534 | the second. */ | |
cce855bc | 535 | /* Make the document really temporary. Also make it the input. */ |
495aee44 | 536 | fd2 = open (filename, O_RDONLY|O_BINARY, 0600); |
cce855bc | 537 | |
bb70624e | 538 | if (fd2 < 0) |
cce855bc JA |
539 | { |
540 | r = errno; | |
541 | unlink (filename); | |
28ef6c31 | 542 | free (filename); |
bb70624e | 543 | close (fd); |
cce855bc JA |
544 | errno = r; |
545 | return -1; | |
546 | } | |
547 | ||
8868edaf CR |
548 | #if HEREDOC_PARANOID |
549 | /* We can use same_file here to check whether or not fd and fd2 refer to | |
550 | the same file, but we don't do that unless HEREDOC_PARANOID is defined. */ | |
551 | if (fstat (fd, &st1) < 0 || S_ISREG (st1.st_mode) == 0 || | |
552 | fstat (fd2, &st2) < 0 || S_ISREG (st2.st_mode) == 0 || | |
553 | same_file (filename, filename, &st1, &st2) == 0) | |
554 | { | |
555 | unlink (filename); | |
556 | free (filename); | |
557 | close (fd); | |
558 | close (fd2); | |
559 | errno = EEXIST; | |
560 | return -1; | |
561 | } | |
562 | #endif | |
563 | ||
bb70624e | 564 | close (fd); |
cce855bc JA |
565 | if (unlink (filename) < 0) |
566 | { | |
567 | r = errno; | |
bb70624e | 568 | close (fd2); |
28ef6c31 | 569 | free (filename); |
cce855bc JA |
570 | errno = r; |
571 | return (-1); | |
572 | } | |
573 | ||
28ef6c31 | 574 | free (filename); |
d233b485 CR |
575 | |
576 | fchmod (fd2, S_IRUSR); | |
bb70624e | 577 | return (fd2); |
cce855bc JA |
578 | } |
579 | ||
bb70624e JA |
580 | #define RF_DEVFD 1 |
581 | #define RF_DEVSTDERR 2 | |
582 | #define RF_DEVSTDIN 3 | |
583 | #define RF_DEVSTDOUT 4 | |
584 | #define RF_DEVTCP 5 | |
585 | #define RF_DEVUDP 6 | |
586 | ||
587 | /* A list of pattern/value pairs for filenames that the redirection | |
588 | code handles specially. */ | |
589 | static STRING_INT_ALIST _redir_special_filenames[] = { | |
590 | #if !defined (HAVE_DEV_FD) | |
591 | { "/dev/fd/[0-9]*", RF_DEVFD }, | |
592 | #endif | |
593 | #if !defined (HAVE_DEV_STDIN) | |
594 | { "/dev/stderr", RF_DEVSTDERR }, | |
595 | { "/dev/stdin", RF_DEVSTDIN }, | |
596 | { "/dev/stdout", RF_DEVSTDOUT }, | |
597 | #endif | |
598 | #if defined (NETWORK_REDIRECTIONS) | |
599 | { "/dev/tcp/*/*", RF_DEVTCP }, | |
600 | { "/dev/udp/*/*", RF_DEVUDP }, | |
601 | #endif | |
602 | { (char *)NULL, -1 } | |
603 | }; | |
604 | ||
605 | static int | |
606 | redir_special_open (spec, filename, flags, mode, ri) | |
607 | int spec; | |
608 | char *filename; | |
609 | int flags, mode; | |
610 | enum r_instruction ri; | |
611 | { | |
612 | int fd; | |
f73dda09 | 613 | #if !defined (HAVE_DEV_FD) |
7117c2d2 | 614 | intmax_t lfd; |
f73dda09 | 615 | #endif |
bb70624e JA |
616 | |
617 | fd = -1; | |
618 | switch (spec) | |
619 | { | |
620 | #if !defined (HAVE_DEV_FD) | |
621 | case RF_DEVFD: | |
f73dda09 JA |
622 | if (all_digits (filename+8) && legal_number (filename+8, &lfd) && lfd == (int)lfd) |
623 | { | |
624 | fd = lfd; | |
3185942a | 625 | fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); |
f73dda09 | 626 | } |
bb70624e JA |
627 | else |
628 | fd = AMBIGUOUS_REDIRECT; | |
629 | break; | |
630 | #endif | |
631 | ||
632 | #if !defined (HAVE_DEV_STDIN) | |
633 | case RF_DEVSTDIN: | |
3185942a | 634 | fd = fcntl (0, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
635 | break; |
636 | case RF_DEVSTDOUT: | |
3185942a | 637 | fd = fcntl (1, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
638 | break; |
639 | case RF_DEVSTDERR: | |
3185942a | 640 | fd = fcntl (2, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
641 | break; |
642 | #endif | |
643 | ||
644 | #if defined (NETWORK_REDIRECTIONS) | |
645 | case RF_DEVTCP: | |
646 | case RF_DEVUDP: | |
d233b485 CR |
647 | #if defined (RESTRICTED_SHELL) |
648 | if (restricted) | |
649 | return (RESTRICTED_REDIRECT); | |
650 | #endif | |
bb70624e JA |
651 | #if defined (HAVE_NETWORK) |
652 | fd = netopen (filename); | |
653 | #else | |
b80f6443 | 654 | internal_warning (_("/dev/(tcp|udp)/host/port not supported without networking")); |
bb70624e JA |
655 | fd = open (filename, flags, mode); |
656 | #endif | |
657 | break; | |
658 | #endif /* NETWORK_REDIRECTIONS */ | |
659 | } | |
660 | ||
661 | return fd; | |
662 | } | |
663 | ||
cce855bc JA |
664 | /* Open FILENAME with FLAGS in noclobber mode, hopefully avoiding most |
665 | race conditions and avoiding the problem where the file is replaced | |
666 | between the stat(2) and open(2). */ | |
667 | static int | |
bb70624e | 668 | noclobber_open (filename, flags, mode, ri) |
cce855bc | 669 | char *filename; |
bb70624e | 670 | int flags, mode; |
cce855bc JA |
671 | enum r_instruction ri; |
672 | { | |
673 | int r, fd; | |
674 | struct stat finfo, finfo2; | |
675 | ||
676 | /* If the file exists and is a regular file, return an error | |
677 | immediately. */ | |
678 | r = stat (filename, &finfo); | |
679 | if (r == 0 && (S_ISREG (finfo.st_mode))) | |
680 | return (NOCLOBBER_REDIRECT); | |
681 | ||
682 | /* If the file was not present (r != 0), make sure we open it | |
683 | exclusively so that if it is created before we open it, our open | |
684 | will fail. Make sure that we do not truncate an existing file. | |
685 | Note that we don't turn on O_EXCL unless the stat failed -- if | |
686 | the file was not a regular file, we leave O_EXCL off. */ | |
687 | flags &= ~O_TRUNC; | |
688 | if (r != 0) | |
689 | { | |
bb70624e | 690 | fd = open (filename, flags|O_EXCL, mode); |
cce855bc JA |
691 | return ((fd < 0 && errno == EEXIST) ? NOCLOBBER_REDIRECT : fd); |
692 | } | |
bb70624e | 693 | fd = open (filename, flags, mode); |
cce855bc JA |
694 | |
695 | /* If the open failed, return the file descriptor right away. */ | |
696 | if (fd < 0) | |
697 | return (errno == EEXIST ? NOCLOBBER_REDIRECT : fd); | |
698 | ||
699 | /* OK, the open succeeded, but the file may have been changed from a | |
700 | non-regular file to a regular file between the stat and the open. | |
701 | We are assuming that the O_EXCL open handles the case where FILENAME | |
702 | did not exist and is symlinked to an existing file between the stat | |
703 | and open. */ | |
704 | ||
705 | /* If we can open it and fstat the file descriptor, and neither check | |
706 | revealed that it was a regular file, and the file has not been replaced, | |
707 | return the file descriptor. */ | |
708 | if ((fstat (fd, &finfo2) == 0) && (S_ISREG (finfo2.st_mode) == 0) && | |
709 | r == 0 && (S_ISREG (finfo.st_mode) == 0) && | |
710 | same_file (filename, filename, &finfo, &finfo2)) | |
711 | return fd; | |
712 | ||
713 | /* The file has been replaced. badness. */ | |
714 | close (fd); | |
715 | errno = EEXIST; | |
716 | return (NOCLOBBER_REDIRECT); | |
717 | } | |
718 | ||
bb70624e JA |
719 | static int |
720 | redir_open (filename, flags, mode, ri) | |
721 | char *filename; | |
722 | int flags, mode; | |
723 | enum r_instruction ri; | |
724 | { | |
ac50fbac | 725 | int fd, r, e; |
bb70624e JA |
726 | |
727 | r = find_string_in_alist (filename, _redir_special_filenames, 1); | |
728 | if (r >= 0) | |
729 | return (redir_special_open (r, filename, flags, mode, ri)); | |
730 | ||
731 | /* If we are in noclobber mode, you are not allowed to overwrite | |
732 | existing files. Check before opening. */ | |
28ef6c31 | 733 | if (noclobber && CLOBBERING_REDIRECT (ri)) |
bb70624e JA |
734 | { |
735 | fd = noclobber_open (filename, flags, mode, ri); | |
736 | if (fd == NOCLOBBER_REDIRECT) | |
737 | return (NOCLOBBER_REDIRECT); | |
738 | } | |
739 | else | |
740 | { | |
ac50fbac CR |
741 | do |
742 | { | |
743 | fd = open (filename, flags, mode); | |
744 | e = errno; | |
745 | if (fd < 0 && e == EINTR) | |
591b09c4 CR |
746 | { |
747 | QUIT; | |
748 | run_pending_traps (); | |
749 | } | |
ac50fbac CR |
750 | errno = e; |
751 | } | |
752 | while (fd < 0 && errno == EINTR); | |
753 | ||
bb70624e JA |
754 | #if defined (AFS) |
755 | if ((fd < 0) && (errno == EACCES)) | |
95732b49 JA |
756 | { |
757 | fd = open (filename, flags & ~O_CREAT, mode); | |
758 | errno = EACCES; /* restore errno */ | |
759 | } | |
bb70624e JA |
760 | #endif /* AFS */ |
761 | } | |
762 | ||
763 | return fd; | |
764 | } | |
765 | ||
3185942a JA |
766 | static int |
767 | undoablefd (fd) | |
768 | int fd; | |
769 | { | |
770 | int clexec; | |
771 | ||
772 | clexec = fcntl (fd, F_GETFD, 0); | |
773 | if (clexec == -1 || (fd >= SHELL_FD_BASE && clexec == 1)) | |
774 | return 0; | |
775 | return 1; | |
776 | } | |
777 | ||
cce855bc JA |
778 | /* Do the specific redirection requested. Returns errno or one of the |
779 | special redirection errors (*_REDIRECT) in case of error, 0 on success. | |
ac50fbac | 780 | If flags & RX_ACTIVE is zero, then just do whatever is necessary to |
b80f6443 JA |
781 | produce the appropriate side effects. flags & RX_UNDOABLE, if non-zero, |
782 | says to remember how to undo each redirection. If flags & RX_CLEXEC is | |
783 | non-zero, then we set all file descriptors > 2 that we open to be | |
8868edaf CR |
784 | close-on-exec. FNP, if non-null is a pointer to a location where the |
785 | expanded filename is stored. The caller will free it. */ | |
cce855bc | 786 | static int |
8868edaf | 787 | do_redirection_internal (redirect, flags, fnp) |
cce855bc | 788 | REDIRECT *redirect; |
b80f6443 | 789 | int flags; |
8868edaf | 790 | char **fnp; |
cce855bc JA |
791 | { |
792 | WORD_DESC *redirectee; | |
bb70624e | 793 | int redir_fd, fd, redirector, r, oflags; |
7117c2d2 | 794 | intmax_t lfd; |
cce855bc JA |
795 | char *redirectee_word; |
796 | enum r_instruction ri; | |
797 | REDIRECT *new_redirect; | |
0001803f | 798 | REDIRECTEE sd; |
cce855bc JA |
799 | |
800 | redirectee = redirect->redirectee.filename; | |
801 | redir_fd = redirect->redirectee.dest; | |
0001803f | 802 | redirector = redirect->redirector.dest; |
cce855bc JA |
803 | ri = redirect->instruction; |
804 | ||
0628567a JA |
805 | if (redirect->flags & RX_INTERNAL) |
806 | flags |= RX_INTERNAL; | |
95732b49 | 807 | |
7117c2d2 | 808 | if (TRANSLATE_REDIRECT (ri)) |
cce855bc | 809 | { |
0001803f CR |
810 | /* We have [N]>&WORD[-] or [N]<&WORD[-] (or {V}>&WORD[-] or {V}<&WORD-). |
811 | and WORD, then translate the redirection into a new one and | |
812 | continue. */ | |
cce855bc JA |
813 | redirectee_word = redirection_expand (redirectee); |
814 | ||
7117c2d2 | 815 | /* XXX - what to do with [N]<&$w- where w is unset or null? ksh93 |
74091dd4 CR |
816 | turns it into [N]<&- or [N]>&- and closes N. */ |
817 | if ((ri == r_move_input_word || ri == r_move_output_word) && redirectee_word == 0) | |
818 | { | |
819 | sd = redirect->redirector; | |
820 | rd.dest = 0; | |
821 | new_redirect = make_redirection (sd, r_close_this, rd, 0); | |
822 | } | |
823 | else if (redirectee_word == 0) | |
cce855bc JA |
824 | return (AMBIGUOUS_REDIRECT); |
825 | else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0') | |
826 | { | |
0001803f | 827 | sd = redirect->redirector; |
f73dda09 | 828 | rd.dest = 0; |
0001803f | 829 | new_redirect = make_redirection (sd, r_close_this, rd, 0); |
cce855bc JA |
830 | } |
831 | else if (all_digits (redirectee_word)) | |
832 | { | |
0001803f | 833 | sd = redirect->redirector; |
f73dda09 JA |
834 | if (legal_number (redirectee_word, &lfd) && (int)lfd == lfd) |
835 | rd.dest = lfd; | |
cce855bc | 836 | else |
f73dda09 | 837 | rd.dest = -1; /* XXX */ |
7117c2d2 JA |
838 | switch (ri) |
839 | { | |
840 | case r_duplicating_input_word: | |
0001803f | 841 | new_redirect = make_redirection (sd, r_duplicating_input, rd, 0); |
7117c2d2 JA |
842 | break; |
843 | case r_duplicating_output_word: | |
0001803f | 844 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
7117c2d2 JA |
845 | break; |
846 | case r_move_input_word: | |
0001803f | 847 | new_redirect = make_redirection (sd, r_move_input, rd, 0); |
7117c2d2 JA |
848 | break; |
849 | case r_move_output_word: | |
0001803f | 850 | new_redirect = make_redirection (sd, r_move_output, rd, 0); |
7117c2d2 | 851 | break; |
d233b485 CR |
852 | default: |
853 | break; /* shut up gcc */ | |
7117c2d2 | 854 | } |
cce855bc | 855 | } |
0001803f | 856 | else if (ri == r_duplicating_output_word && (redirect->rflags & REDIR_VARASSIGN) == 0 && redirector == 1) |
cce855bc | 857 | { |
0001803f | 858 | sd = redirect->redirector; |
28ef6c31 | 859 | rd.filename = make_bare_word (redirectee_word); |
0001803f | 860 | new_redirect = make_redirection (sd, r_err_and_out, rd, 0); |
cce855bc JA |
861 | } |
862 | else | |
863 | { | |
864 | free (redirectee_word); | |
865 | return (AMBIGUOUS_REDIRECT); | |
866 | } | |
867 | ||
868 | free (redirectee_word); | |
869 | ||
870 | /* Set up the variables needed by the rest of the function from the | |
871 | new redirection. */ | |
872 | if (new_redirect->instruction == r_err_and_out) | |
873 | { | |
874 | char *alloca_hack; | |
875 | ||
876 | /* Copy the word without allocating any memory that must be | |
877 | explicitly freed. */ | |
878 | redirectee = (WORD_DESC *)alloca (sizeof (WORD_DESC)); | |
879 | xbcopy ((char *)new_redirect->redirectee.filename, | |
880 | (char *)redirectee, sizeof (WORD_DESC)); | |
881 | ||
882 | alloca_hack = (char *) | |
883 | alloca (1 + strlen (new_redirect->redirectee.filename->word)); | |
884 | redirectee->word = alloca_hack; | |
885 | strcpy (redirectee->word, new_redirect->redirectee.filename->word); | |
886 | } | |
887 | else | |
888 | /* It's guaranteed to be an integer, and shouldn't be freed. */ | |
889 | redirectee = new_redirect->redirectee.filename; | |
890 | ||
891 | redir_fd = new_redirect->redirectee.dest; | |
0001803f | 892 | redirector = new_redirect->redirector.dest; |
cce855bc JA |
893 | ri = new_redirect->instruction; |
894 | ||
895 | /* Overwrite the flags element of the old redirect with the new value. */ | |
896 | redirect->flags = new_redirect->flags; | |
897 | dispose_redirects (new_redirect); | |
898 | } | |
899 | ||
900 | switch (ri) | |
901 | { | |
902 | case r_output_direction: | |
903 | case r_appending_to: | |
904 | case r_input_direction: | |
905 | case r_inputa_direction: | |
906 | case r_err_and_out: /* command &>filename */ | |
3185942a | 907 | case r_append_err_and_out: /* command &>> filename */ |
cce855bc JA |
908 | case r_input_output: |
909 | case r_output_force: | |
bb70624e | 910 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 JA |
911 | { |
912 | oflags = redirectee->flags; | |
913 | redirectee->flags |= W_NOGLOB; | |
914 | } | |
cce855bc | 915 | redirectee_word = redirection_expand (redirectee); |
bb70624e JA |
916 | if (posixly_correct && interactive_shell == 0) |
917 | redirectee->flags = oflags; | |
cce855bc JA |
918 | |
919 | if (redirectee_word == 0) | |
920 | return (AMBIGUOUS_REDIRECT); | |
921 | ||
922 | #if defined (RESTRICTED_SHELL) | |
923 | if (restricted && (WRITE_REDIRECT (ri))) | |
924 | { | |
925 | free (redirectee_word); | |
926 | return (RESTRICTED_REDIRECT); | |
927 | } | |
928 | #endif /* RESTRICTED_SHELL */ | |
929 | ||
bb70624e | 930 | fd = redir_open (redirectee_word, redirect->flags, 0666, ri); |
8868edaf CR |
931 | if (fnp) |
932 | *fnp = redirectee_word; | |
933 | else | |
934 | free (redirectee_word); | |
cce855bc | 935 | |
d233b485 | 936 | if (fd == NOCLOBBER_REDIRECT || fd == RESTRICTED_REDIRECT) |
28ef6c31 | 937 | return (fd); |
bb70624e | 938 | |
cce855bc JA |
939 | if (fd < 0) |
940 | return (errno); | |
941 | ||
b80f6443 | 942 | if (flags & RX_ACTIVE) |
cce855bc | 943 | { |
0001803f | 944 | if (redirect->rflags & REDIR_VARASSIGN) |
495aee44 CR |
945 | { |
946 | redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
947 | r = errno; | |
948 | if (redirector < 0) | |
949 | sys_error (_("redirection error: cannot duplicate fd")); | |
950 | REDIRECTION_ERROR (redirector, r, fd); | |
951 | } | |
0001803f | 952 | |
74091dd4 | 953 | if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose)) |
f73dda09 | 954 | { |
74091dd4 CR |
955 | /* Only setup to undo it if the thing to undo is active. We want |
956 | to autoclose if we are doing a varassign redirection and the | |
957 | varredir_close shell option is set, and we can't test | |
958 | redirector in this case since we just assigned it above. */ | |
959 | if (fd != redirector && (redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose) | |
960 | r = add_undo_close_redirect (redirector); | |
961 | else if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
495aee44 | 962 | r = add_undo_redirect (redirector, ri, -1); |
f73dda09 | 963 | else |
495aee44 | 964 | r = add_undo_close_redirect (redirector); |
495aee44 | 965 | REDIRECTION_ERROR (r, errno, fd); |
f73dda09 | 966 | } |
cce855bc JA |
967 | |
968 | #if defined (BUFFERED_INPUT) | |
ac50fbac CR |
969 | /* inhibit call to sync_buffered_stream() for async processes */ |
970 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
971 | check_bash_input (redirector); | |
cce855bc JA |
972 | #endif |
973 | ||
3185942a JA |
974 | /* Make sure there is no pending output before we change the state |
975 | of the underlying file descriptor, since the builtins use stdio | |
976 | for output. */ | |
977 | if (redirector == 1 && fileno (stdout) == redirector) | |
978 | { | |
979 | fflush (stdout); | |
980 | fpurge (stdout); | |
981 | } | |
982 | else if (redirector == 2 && fileno (stderr) == redirector) | |
983 | { | |
984 | fflush (stderr); | |
985 | fpurge (stderr); | |
986 | } | |
987 | ||
0001803f CR |
988 | if (redirect->rflags & REDIR_VARASSIGN) |
989 | { | |
990 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
991 | { | |
992 | close (redirector); | |
993 | close (fd); | |
994 | return (r); /* XXX */ | |
995 | } | |
996 | } | |
997 | else if ((fd != redirector) && (dup2 (fd, redirector) < 0)) | |
a0c0a00f CR |
998 | { |
999 | close (fd); /* dup2 failed? must be fd limit issue */ | |
1000 | return (errno); | |
1001 | } | |
cce855bc JA |
1002 | |
1003 | #if defined (BUFFERED_INPUT) | |
1004 | /* Do not change the buffered stream for an implicit redirection | |
1005 | of /dev/null to fd 0 for asynchronous commands without job | |
1006 | control (r_inputa_direction). */ | |
1007 | if (ri == r_input_direction || ri == r_input_output) | |
1008 | duplicate_buffered_stream (fd, redirector); | |
1009 | #endif /* BUFFERED_INPUT */ | |
1010 | ||
1011 | /* | |
1012 | * If we're remembering, then this is the result of a while, for | |
1013 | * or until loop with a loop redirection, or a function/builtin | |
1014 | * executing in the parent shell with a redirection. In the | |
1015 | * function/builtin case, we want to set all file descriptors > 2 | |
1016 | * to be close-on-exec to duplicate the effect of the old | |
1017 | * for i = 3 to NOFILE close(i) loop. In the case of the loops, | |
1018 | * both sh and ksh leave the file descriptors open across execs. | |
1019 | * The Posix standard mentions only the exec builtin. | |
1020 | */ | |
b80f6443 | 1021 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
1022 | SET_CLOSE_ON_EXEC (redirector); |
1023 | } | |
1024 | ||
1025 | if (fd != redirector) | |
1026 | { | |
1027 | #if defined (BUFFERED_INPUT) | |
1028 | if (INPUT_REDIRECT (ri)) | |
1029 | close_buffered_fd (fd); | |
1030 | else | |
1031 | #endif /* !BUFFERED_INPUT */ | |
1032 | close (fd); /* Don't close what we just opened! */ | |
1033 | } | |
1034 | ||
1035 | /* If we are hacking both stdout and stderr, do the stderr | |
0001803f | 1036 | redirection here. XXX - handle {var} here? */ |
3185942a | 1037 | if (ri == r_err_and_out || ri == r_append_err_and_out) |
cce855bc | 1038 | { |
b80f6443 | 1039 | if (flags & RX_ACTIVE) |
cce855bc | 1040 | { |
b80f6443 | 1041 | if (flags & RX_UNDOABLE) |
3185942a | 1042 | add_undo_redirect (2, ri, -1); |
cce855bc JA |
1043 | if (dup2 (1, 2) < 0) |
1044 | return (errno); | |
1045 | } | |
1046 | } | |
1047 | break; | |
1048 | ||
1049 | case r_reading_until: | |
1050 | case r_deblank_reading_until: | |
7117c2d2 | 1051 | case r_reading_string: |
cce855bc JA |
1052 | /* REDIRECTEE is a pointer to a WORD_DESC containing the text of |
1053 | the new input. Place it in a temporary file. */ | |
1054 | if (redirectee) | |
1055 | { | |
7117c2d2 | 1056 | fd = here_document_to_fd (redirectee, ri); |
cce855bc JA |
1057 | |
1058 | if (fd < 0) | |
1059 | { | |
1060 | heredoc_errno = errno; | |
1061 | return (HEREDOC_REDIRECT); | |
1062 | } | |
1063 | ||
0001803f | 1064 | if (redirect->rflags & REDIR_VARASSIGN) |
495aee44 CR |
1065 | { |
1066 | redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
1067 | r = errno; | |
1068 | if (redirector < 0) | |
1069 | sys_error (_("redirection error: cannot duplicate fd")); | |
1070 | REDIRECTION_ERROR (redirector, r, fd); | |
1071 | } | |
0001803f | 1072 | |
b80f6443 | 1073 | if (flags & RX_ACTIVE) |
cce855bc | 1074 | { |
74091dd4 | 1075 | if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose)) |
f73dda09 | 1076 | { |
74091dd4 CR |
1077 | /* Only setup to undo it if the thing to undo is active. |
1078 | Close if the right option is set and we are doing a | |
1079 | varassign redirection. */ | |
1080 | if (fd != redirector && (redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose) | |
1081 | r = add_undo_close_redirect (redirector); | |
1082 | else if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
495aee44 | 1083 | r = add_undo_redirect (redirector, ri, -1); |
f73dda09 | 1084 | else |
495aee44 | 1085 | r = add_undo_close_redirect (redirector); |
495aee44 | 1086 | REDIRECTION_ERROR (r, errno, fd); |
f73dda09 | 1087 | } |
cce855bc JA |
1088 | |
1089 | #if defined (BUFFERED_INPUT) | |
1090 | check_bash_input (redirector); | |
1091 | #endif | |
0001803f CR |
1092 | if (redirect->rflags & REDIR_VARASSIGN) |
1093 | { | |
1094 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
1095 | { | |
1096 | close (redirector); | |
1097 | close (fd); | |
1098 | return (r); /* XXX */ | |
1099 | } | |
1100 | } | |
1101 | else if (fd != redirector && dup2 (fd, redirector) < 0) | |
cce855bc JA |
1102 | { |
1103 | r = errno; | |
1104 | close (fd); | |
1105 | return (r); | |
1106 | } | |
1107 | ||
1108 | #if defined (BUFFERED_INPUT) | |
1109 | duplicate_buffered_stream (fd, redirector); | |
1110 | #endif | |
1111 | ||
b80f6443 | 1112 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
1113 | SET_CLOSE_ON_EXEC (redirector); |
1114 | } | |
1115 | ||
bb70624e | 1116 | if (fd != redirector) |
cce855bc | 1117 | #if defined (BUFFERED_INPUT) |
bb70624e | 1118 | close_buffered_fd (fd); |
cce855bc | 1119 | #else |
bb70624e | 1120 | close (fd); |
cce855bc JA |
1121 | #endif |
1122 | } | |
1123 | break; | |
1124 | ||
1125 | case r_duplicating_input: | |
1126 | case r_duplicating_output: | |
7117c2d2 JA |
1127 | case r_move_input: |
1128 | case r_move_output: | |
0001803f | 1129 | if ((flags & RX_ACTIVE) && (redirect->rflags & REDIR_VARASSIGN)) |
495aee44 CR |
1130 | { |
1131 | redirector = fcntl (redir_fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
1132 | r = errno; | |
1133 | if (redirector < 0) | |
1134 | sys_error (_("redirection error: cannot duplicate fd")); | |
1135 | REDIRECTION_ERROR (redirector, r, -1); | |
1136 | } | |
0001803f | 1137 | |
b80f6443 | 1138 | if ((flags & RX_ACTIVE) && (redir_fd != redirector)) |
cce855bc | 1139 | { |
74091dd4 | 1140 | if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose)) |
f73dda09 | 1141 | { |
74091dd4 CR |
1142 | /* Only setup to undo it if the thing to undo is active. |
1143 | Close if the right option is set and we are doing a | |
1144 | varassign redirection. */ | |
1145 | if ((redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose) | |
1146 | r = add_undo_close_redirect (redirector); | |
1147 | else if (fcntl (redirector, F_GETFD, 0) != -1) | |
495aee44 | 1148 | r = add_undo_redirect (redirector, ri, redir_fd); |
f73dda09 | 1149 | else |
495aee44 | 1150 | r = add_undo_close_redirect (redirector); |
495aee44 | 1151 | REDIRECTION_ERROR (r, errno, -1); |
f73dda09 | 1152 | } |
f281b8f4 CR |
1153 | if ((flags & RX_UNDOABLE) && (ri == r_move_input || ri == r_move_output)) |
1154 | { | |
1155 | /* r_move_input and r_move_output add an additional close() | |
1156 | that needs to be undone */ | |
1157 | if (fcntl (redirector, F_GETFD, 0) != -1) | |
1158 | { | |
1159 | r = add_undo_redirect (redir_fd, r_close_this, -1); | |
1160 | REDIRECTION_ERROR (r, errno, -1); | |
1161 | } | |
1162 | } | |
cce855bc | 1163 | #if defined (BUFFERED_INPUT) |
ac50fbac CR |
1164 | /* inhibit call to sync_buffered_stream() for async processes */ |
1165 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
1166 | check_bash_input (redirector); | |
cce855bc | 1167 | #endif |
0001803f CR |
1168 | if (redirect->rflags & REDIR_VARASSIGN) |
1169 | { | |
1170 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
1171 | { | |
1172 | close (redirector); | |
1173 | return (r); /* XXX */ | |
1174 | } | |
1175 | } | |
cce855bc | 1176 | /* This is correct. 2>&1 means dup2 (1, 2); */ |
0001803f | 1177 | else if (dup2 (redir_fd, redirector) < 0) |
cce855bc JA |
1178 | return (errno); |
1179 | ||
1180 | #if defined (BUFFERED_INPUT) | |
7117c2d2 | 1181 | if (ri == r_duplicating_input || ri == r_move_input) |
cce855bc JA |
1182 | duplicate_buffered_stream (redir_fd, redirector); |
1183 | #endif /* BUFFERED_INPUT */ | |
1184 | ||
1185 | /* First duplicate the close-on-exec state of redirectee. dup2 | |
1186 | leaves the flag unset on the new descriptor, which means it | |
1187 | stays open. Only set the close-on-exec bit for file descriptors | |
1188 | greater than 2 in any case, since 0-2 should always be open | |
95732b49 JA |
1189 | unless closed by something like `exec 2<&-'. It should always |
1190 | be safe to set fds > 2 to close-on-exec if they're being used to | |
1191 | save file descriptors < 2, since we don't need to preserve the | |
1192 | state of the close-on-exec flag for those fds -- they should | |
1193 | always be open. */ | |
cce855bc JA |
1194 | /* if ((already_set || set_unconditionally) && (ok_to_set)) |
1195 | set_it () */ | |
95732b49 JA |
1196 | #if 0 |
1197 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || redir_fd < 2 || (flags & RX_CLEXEC)) && | |
1198 | (redirector > 2)) | |
1199 | #else | |
1200 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || (redir_fd < 2 && (flags & RX_INTERNAL)) || (flags & RX_CLEXEC)) && | |
cce855bc | 1201 | (redirector > 2)) |
95732b49 | 1202 | #endif |
cce855bc | 1203 | SET_CLOSE_ON_EXEC (redirector); |
7117c2d2 | 1204 | |
3185942a JA |
1205 | /* When undoing saving of non-standard file descriptors (>=3) using |
1206 | file descriptors >= SHELL_FD_BASE, we set the saving fd to be | |
1207 | close-on-exec and use a flag to decide how to set close-on-exec | |
1208 | when the fd is restored. */ | |
ac50fbac | 1209 | if ((redirect->flags & RX_INTERNAL) && (redirect->flags & RX_SAVCLEXEC) && redirector >= 3 && (redir_fd >= SHELL_FD_BASE || (redirect->flags & RX_SAVEFD))) |
3185942a JA |
1210 | SET_OPEN_ON_EXEC (redirector); |
1211 | ||
7117c2d2 JA |
1212 | /* dup-and-close redirection */ |
1213 | if (ri == r_move_input || ri == r_move_output) | |
3185942a | 1214 | { |
0001803f CR |
1215 | xtrace_fdchk (redir_fd); |
1216 | ||
3185942a JA |
1217 | close (redir_fd); |
1218 | #if defined (COPROCESS_SUPPORT) | |
1219 | coproc_fdchk (redir_fd); /* XXX - loses coproc fds */ | |
1220 | #endif | |
1221 | } | |
cce855bc JA |
1222 | } |
1223 | break; | |
1224 | ||
1225 | case r_close_this: | |
b80f6443 | 1226 | if (flags & RX_ACTIVE) |
cce855bc | 1227 | { |
0001803f CR |
1228 | if (redirect->rflags & REDIR_VARASSIGN) |
1229 | { | |
1230 | redirector = redir_varvalue (redirect); | |
1231 | if (redirector < 0) | |
1232 | return AMBIGUOUS_REDIRECT; | |
1233 | } | |
1234 | ||
495aee44 | 1235 | r = 0; |
d233b485 | 1236 | if (flags & RX_UNDOABLE) |
495aee44 | 1237 | { |
d233b485 CR |
1238 | if (fcntl (redirector, F_GETFD, 0) != -1) |
1239 | r = add_undo_redirect (redirector, ri, -1); | |
1240 | else | |
1241 | r = add_undo_close_redirect (redirector); | |
495aee44 CR |
1242 | REDIRECTION_ERROR (r, errno, redirector); |
1243 | } | |
3185942a JA |
1244 | |
1245 | #if defined (COPROCESS_SUPPORT) | |
1246 | coproc_fdchk (redirector); | |
1247 | #endif | |
0001803f | 1248 | xtrace_fdchk (redirector); |
cce855bc JA |
1249 | |
1250 | #if defined (BUFFERED_INPUT) | |
ac50fbac CR |
1251 | /* inhibit call to sync_buffered_stream() for async processes */ |
1252 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
1253 | check_bash_input (redirector); | |
774d3bf6 | 1254 | r = close_buffered_fd (redirector); |
cce855bc | 1255 | #else /* !BUFFERED_INPUT */ |
774d3bf6 | 1256 | r = close (redirector); |
cce855bc | 1257 | #endif /* !BUFFERED_INPUT */ |
ac50fbac | 1258 | |
774d3bf6 CR |
1259 | if (r < 0 && (flags & RX_INTERNAL) && (errno == EIO || errno == ENOSPC)) |
1260 | REDIRECTION_ERROR (r, errno, -1); | |
cce855bc JA |
1261 | } |
1262 | break; | |
1263 | ||
1264 | case r_duplicating_input_word: | |
1265 | case r_duplicating_output_word: | |
d233b485 CR |
1266 | case r_move_input_word: |
1267 | case r_move_output_word: | |
cce855bc JA |
1268 | break; |
1269 | } | |
1270 | return (0); | |
1271 | } | |
1272 | ||
cce855bc JA |
1273 | /* Remember the file descriptor associated with the slot FD, |
1274 | on REDIRECTION_UNDO_LIST. Note that the list will be reversed | |
1275 | before it is executed. Any redirections that need to be undone | |
1276 | even if REDIRECTION_UNDO_LIST is discarded by the exec builtin | |
3185942a JA |
1277 | are also saved on EXEC_REDIRECTION_UNDO_LIST. FDBASE says where to |
1278 | start the duplicating. If it's less than SHELL_FD_BASE, we're ok, | |
1279 | and can use SHELL_FD_BASE (-1 == don't care). If it's >= SHELL_FD_BASE, | |
1280 | we have to make sure we don't use fdbase to save a file descriptor, | |
1281 | since we're going to use it later (e.g., make sure we don't save fd 0 | |
1282 | to fd 10 if we have a redirection like 0<&10). If the value of fdbase | |
1283 | puts the process over its fd limit, causing fcntl to fail, we try | |
495aee44 | 1284 | again with SHELL_FD_BASE. Return 0 on success, -1 on error. */ |
cce855bc | 1285 | static int |
3185942a | 1286 | add_undo_redirect (fd, ri, fdbase) |
cce855bc | 1287 | int fd; |
0628567a | 1288 | enum r_instruction ri; |
3185942a | 1289 | int fdbase; |
cce855bc | 1290 | { |
ac50fbac | 1291 | int new_fd, clexec_flag, savefd_flag; |
cce855bc | 1292 | REDIRECT *new_redirect, *closer, *dummy_redirect; |
0001803f | 1293 | REDIRECTEE sd; |
cce855bc | 1294 | |
ac50fbac | 1295 | savefd_flag = 0; |
3185942a JA |
1296 | new_fd = fcntl (fd, F_DUPFD, (fdbase < SHELL_FD_BASE) ? SHELL_FD_BASE : fdbase+1); |
1297 | if (new_fd < 0) | |
1298 | new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); | |
ac50fbac CR |
1299 | if (new_fd < 0) |
1300 | { | |
1301 | new_fd = fcntl (fd, F_DUPFD, 0); | |
1302 | savefd_flag = 1; | |
1303 | } | |
cce855bc JA |
1304 | |
1305 | if (new_fd < 0) | |
1306 | { | |
b80f6443 | 1307 | sys_error (_("redirection error: cannot duplicate fd")); |
cce855bc JA |
1308 | return (-1); |
1309 | } | |
1310 | ||
1311 | clexec_flag = fcntl (fd, F_GETFD, 0); | |
1312 | ||
0001803f | 1313 | sd.dest = new_fd; |
f73dda09 | 1314 | rd.dest = 0; |
0001803f | 1315 | closer = make_redirection (sd, r_close_this, rd, 0); |
95732b49 | 1316 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1317 | dummy_redirect = copy_redirects (closer); |
1318 | ||
0001803f | 1319 | sd.dest = fd; |
f73dda09 | 1320 | rd.dest = new_fd; |
28ef6c31 | 1321 | if (fd == 0) |
0001803f | 1322 | new_redirect = make_redirection (sd, r_duplicating_input, rd, 0); |
28ef6c31 | 1323 | else |
0001803f | 1324 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
95732b49 | 1325 | new_redirect->flags |= RX_INTERNAL; |
ac50fbac CR |
1326 | if (savefd_flag) |
1327 | new_redirect->flags |= RX_SAVEFD; | |
1328 | if (clexec_flag == 0 && fd >= 3 && (new_fd >= SHELL_FD_BASE || savefd_flag)) | |
3185942a | 1329 | new_redirect->flags |= RX_SAVCLEXEC; |
cce855bc JA |
1330 | new_redirect->next = closer; |
1331 | ||
1332 | closer->next = redirection_undo_list; | |
1333 | redirection_undo_list = new_redirect; | |
1334 | ||
1335 | /* Save redirections that need to be undone even if the undo list | |
1336 | is thrown away by the `exec' builtin. */ | |
1337 | add_exec_redirect (dummy_redirect); | |
1338 | ||
95732b49 JA |
1339 | /* experimental: if we're saving a redirection to undo for a file descriptor |
1340 | above SHELL_FD_BASE, add a redirection to be undone if the exec builtin | |
3185942a JA |
1341 | causes redirections to be discarded. There needs to be a difference |
1342 | between fds that are used to save other fds and then are the target of | |
495aee44 | 1343 | user redirections and fds that are just the target of user redirections. |
3185942a JA |
1344 | We use the close-on-exec flag to tell the difference; fds > SHELL_FD_BASE |
1345 | that have the close-on-exec flag set are assumed to be fds used internally | |
1346 | to save others. */ | |
1347 | if (fd >= SHELL_FD_BASE && ri != r_close_this && clexec_flag) | |
95732b49 | 1348 | { |
0001803f | 1349 | sd.dest = fd; |
95732b49 | 1350 | rd.dest = new_fd; |
0001803f | 1351 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
3185942a JA |
1352 | new_redirect->flags |= RX_INTERNAL; |
1353 | ||
95732b49 | 1354 | add_exec_redirect (new_redirect); |
95732b49 JA |
1355 | } |
1356 | ||
cce855bc JA |
1357 | /* File descriptors used only for saving others should always be |
1358 | marked close-on-exec. Unfortunately, we have to preserve the | |
1359 | close-on-exec state of the file descriptor we are saving, since | |
1360 | fcntl (F_DUPFD) sets the new file descriptor to remain open | |
1361 | across execs. If, however, the file descriptor whose state we | |
1362 | are saving is <= 2, we can just set the close-on-exec flag, | |
1363 | because file descriptors 0-2 should always be open-on-exec, | |
1364 | and the restore above in do_redirection() will take care of it. */ | |
1365 | if (clexec_flag || fd < 3) | |
1366 | SET_CLOSE_ON_EXEC (new_fd); | |
3185942a JA |
1367 | else if (redirection_undo_list->flags & RX_SAVCLEXEC) |
1368 | SET_CLOSE_ON_EXEC (new_fd); | |
cce855bc JA |
1369 | |
1370 | return (0); | |
1371 | } | |
1372 | ||
1373 | /* Set up to close FD when we are finished with the current command | |
495aee44 CR |
1374 | and its redirections. Return 0 on success, -1 on error. */ |
1375 | static int | |
cce855bc JA |
1376 | add_undo_close_redirect (fd) |
1377 | int fd; | |
1378 | { | |
1379 | REDIRECT *closer; | |
0001803f | 1380 | REDIRECTEE sd; |
cce855bc | 1381 | |
0001803f | 1382 | sd.dest = fd; |
f73dda09 | 1383 | rd.dest = 0; |
0001803f | 1384 | closer = make_redirection (sd, r_close_this, rd, 0); |
95732b49 | 1385 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1386 | closer->next = redirection_undo_list; |
1387 | redirection_undo_list = closer; | |
495aee44 CR |
1388 | |
1389 | return 0; | |
cce855bc JA |
1390 | } |
1391 | ||
1392 | static void | |
1393 | add_exec_redirect (dummy_redirect) | |
1394 | REDIRECT *dummy_redirect; | |
1395 | { | |
1396 | dummy_redirect->next = exec_redirection_undo_list; | |
1397 | exec_redirection_undo_list = dummy_redirect; | |
1398 | } | |
1399 | ||
bb70624e JA |
1400 | /* Return 1 if the redirection specified by RI and REDIRECTOR alters the |
1401 | standard input. */ | |
1402 | static int | |
1403 | stdin_redirection (ri, redirector) | |
1404 | enum r_instruction ri; | |
1405 | int redirector; | |
1406 | { | |
1407 | switch (ri) | |
1408 | { | |
1409 | case r_input_direction: | |
1410 | case r_inputa_direction: | |
1411 | case r_input_output: | |
1412 | case r_reading_until: | |
1413 | case r_deblank_reading_until: | |
7117c2d2 | 1414 | case r_reading_string: |
bb70624e JA |
1415 | return (1); |
1416 | case r_duplicating_input: | |
1417 | case r_duplicating_input_word: | |
1418 | case r_close_this: | |
1419 | return (redirector == 0); | |
1420 | case r_output_direction: | |
1421 | case r_appending_to: | |
1422 | case r_duplicating_output: | |
1423 | case r_err_and_out: | |
3185942a | 1424 | case r_append_err_and_out: |
bb70624e JA |
1425 | case r_output_force: |
1426 | case r_duplicating_output_word: | |
d233b485 CR |
1427 | case r_move_input: |
1428 | case r_move_output: | |
1429 | case r_move_input_word: | |
1430 | case r_move_output_word: | |
bb70624e JA |
1431 | return (0); |
1432 | } | |
1433 | return (0); | |
1434 | } | |
1435 | ||
cce855bc JA |
1436 | /* Return non-zero if any of the redirections in REDIRS alter the standard |
1437 | input. */ | |
1438 | int | |
1439 | stdin_redirects (redirs) | |
1440 | REDIRECT *redirs; | |
1441 | { | |
1442 | REDIRECT *rp; | |
1443 | int n; | |
1444 | ||
1445 | for (n = 0, rp = redirs; rp; rp = rp->next) | |
0001803f CR |
1446 | if ((rp->rflags & REDIR_VARASSIGN) == 0) |
1447 | n += stdin_redirection (rp->instruction, rp->redirector.dest); | |
cce855bc JA |
1448 | return n; |
1449 | } | |
ac50fbac | 1450 | /* bind_var_to_int handles array references */ |
0001803f CR |
1451 | static int |
1452 | redir_varassign (redir, fd) | |
1453 | REDIRECT *redir; | |
1454 | int fd; | |
1455 | { | |
1456 | WORD_DESC *w; | |
1457 | SHELL_VAR *v; | |
1458 | ||
1459 | w = redir->redirector.filename; | |
74091dd4 | 1460 | v = bind_var_to_int (w->word, fd, 0); |
0001803f CR |
1461 | if (v == 0 || readonly_p (v) || noassign_p (v)) |
1462 | return BADVAR_REDIRECT; | |
1463 | ||
ac50fbac | 1464 | stupidly_hack_special_variables (w->word); |
0001803f CR |
1465 | return 0; |
1466 | } | |
1467 | ||
ac50fbac | 1468 | /* Handles {array[ind]} for redirection words */ |
0001803f CR |
1469 | static int |
1470 | redir_varvalue (redir) | |
1471 | REDIRECT *redir; | |
1472 | { | |
1473 | SHELL_VAR *v; | |
ac50fbac | 1474 | char *val, *w; |
0001803f CR |
1475 | intmax_t vmax; |
1476 | int i; | |
ac50fbac CR |
1477 | #if defined (ARRAY_VARS) |
1478 | char *sub; | |
1479 | int len, vr; | |
1480 | #endif | |
0001803f | 1481 | |
ac50fbac | 1482 | w = redir->redirector.filename->word; /* shorthand */ |
0001803f | 1483 | /* XXX - handle set -u here? */ |
ac50fbac | 1484 | #if defined (ARRAY_VARS) |
a0c0a00f CR |
1485 | if (vr = valid_array_reference (w, 0)) |
1486 | { | |
d233b485 | 1487 | v = array_variable_part (w, 0, &sub, &len); |
a0c0a00f | 1488 | } |
ac50fbac CR |
1489 | else |
1490 | #endif | |
a0c0a00f CR |
1491 | { |
1492 | v = find_variable (w); | |
1493 | #if defined (ARRAY_VARS) | |
1494 | if (v == 0) | |
1495 | { | |
1496 | v = find_variable_last_nameref (w, 0); | |
1497 | if (v && nameref_p (v)) | |
1498 | { | |
1499 | w = nameref_cell (v); | |
1500 | if (vr = valid_array_reference (w, 0)) | |
d233b485 | 1501 | v = array_variable_part (w, 0, &sub, &len); |
a0c0a00f CR |
1502 | else |
1503 | v = find_variable (w); | |
1504 | } | |
1505 | } | |
1506 | #endif | |
1507 | } | |
1508 | ||
0001803f CR |
1509 | if (v == 0 || invisible_p (v)) |
1510 | return -1; | |
1511 | ||
ac50fbac CR |
1512 | #if defined (ARRAY_VARS) |
1513 | /* get_variable_value handles references to array variables without | |
1514 | subscripts */ | |
1515 | if (vr && (array_p (v) || assoc_p (v))) | |
74091dd4 | 1516 | val = get_array_value (w, 0, (array_eltstate_t *)NULL); |
ac50fbac CR |
1517 | else |
1518 | #endif | |
0001803f CR |
1519 | val = get_variable_value (v); |
1520 | if (val == 0 || *val == 0) | |
1521 | return -1; | |
1522 | ||
1523 | if (legal_number (val, &vmax) < 0) | |
1524 | return -1; | |
1525 | ||
1526 | i = vmax; /* integer truncation */ | |
1527 | return i; | |
1528 | } |