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Commit | Line | Data |
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cce855bc JA |
1 | /* redir.c -- Functions to perform input and output redirection. */ |
2 | ||
349e2104 | 3 | /* Copyright (C) 1997-2023 Free Software Foundation, Inc. |
cce855bc JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
2e4498b3 CR |
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 | |
2e4498b3 CR |
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 | |
2e4498b3 CR |
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" | |
d3a24ed2 | 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" | |
5e13499c | 46 | #include "bashintl.h" |
cce855bc | 47 | #include "memalloc.h" |
53ac45a3 CR |
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" | |
06c3a575 | 55 | #include "trap.h" |
cce855bc | 56 | |
349e2104 | 57 | #include "input.h" |
cce855bc | 58 | |
31321bf1 CR |
59 | #include "builtins/pipesize.h" |
60 | ||
f9f8a7fa CR |
61 | /* FreeBSD 13 can reliably handle atomic writes at this capacity without |
62 | hanging. */ | |
63 | #if __FreeBSD__ && !defined (HEREDOC_PIPESIZE) | |
64 | # define HEREDOC_PIPESIZE 4096 | |
65 | #endif | |
66 | ||
31321bf1 CR |
67 | /* Normally set by a build process command that computes pipe capacity */ |
68 | #ifndef PIPESIZE | |
69 | # ifdef PIPE_BUF | |
70 | # define PIPESIZE PIPE_BUF | |
71 | # else | |
72 | # define PIPESIZE 4096 | |
73 | # endif | |
74 | #endif | |
75 | ||
5d31eaea CR |
76 | #ifndef HEREDOC_PIPESIZE |
77 | # define HEREDOC_PIPESIZE PIPESIZE | |
78 | #endif | |
79 | ||
80 | #if defined (HEREDOC_PIPEMAX) | |
81 | # if HEREDOC_PIPESIZE > HEREDOC_PIPEMAX | |
82 | # define HEREDOC_PIPESIZE HEREDOC_PIPEMAX | |
83 | # endif | |
84 | #endif | |
85 | ||
b0c16657 CR |
86 | #define SHELL_FD_BASE 10 |
87 | ||
d3a24ed2 | 88 | int expanding_redir; |
3fb16fce | 89 | int varassign_redir_autoclose = 0; |
d3a24ed2 | 90 | |
cce855bc JA |
91 | extern REDIRECT *redirection_undo_list; |
92 | extern REDIRECT *exec_redirection_undo_list; | |
93 | ||
94 | /* Static functions defined and used in this file. */ | |
a61ffa78 CR |
95 | static void add_exec_redirect (REDIRECT *); |
96 | static int add_undo_redirect (int, enum r_instruction, int); | |
97 | static int add_undo_close_redirect (int); | |
98 | static int expandable_redirection_filename (REDIRECT *); | |
99 | static int stdin_redirection (enum r_instruction, int); | |
100 | static int undoablefd (int); | |
101 | static int do_redirection_internal (REDIRECT *, int, char **); | |
f73dda09 | 102 | |
a61ffa78 | 103 | static char *heredoc_expand (WORD_DESC *, enum r_instruction, size_t *); |
b2613ad1 | 104 | static int heredoc_write (int, const char *, size_t); |
a61ffa78 | 105 | static int here_document_to_fd (WORD_DESC *, enum r_instruction); |
f73dda09 | 106 | |
a61ffa78 | 107 | static int redir_special_open (int, char *, int, int, enum r_instruction); |
b2613ad1 | 108 | static int noclobber_open (const char *, int, int, enum r_instruction); |
a61ffa78 | 109 | static int redir_open (char *, int, int, enum r_instruction); |
cce855bc | 110 | |
a61ffa78 CR |
111 | static int redir_varassign (REDIRECT *, int); |
112 | static int redir_varvalue (REDIRECT *); | |
a8fd3f3e | 113 | |
7117c2d2 JA |
114 | /* Spare redirector used when translating [N]>&WORD[-] or [N]<&WORD[-] to |
115 | a new redirection and when creating the redirection undo list. */ | |
cce855bc JA |
116 | static REDIRECTEE rd; |
117 | ||
118 | /* Set to errno when a here document cannot be created for some reason. | |
119 | Used to print a reasonable error message. */ | |
120 | static int heredoc_errno; | |
121 | ||
e88665cc CR |
122 | #define REDIRECTION_ERROR(r, e, fd) \ |
123 | do { \ | |
124 | if ((r) < 0) \ | |
e05be32d | 125 | { \ |
e88665cc | 126 | if (fd >= 0) \ |
89c77bc7 | 127 | close (fd); \ |
194cfc28 | 128 | set_exit_status (EXECUTION_FAILURE);\ |
e05be32d | 129 | return ((e) == 0 ? EINVAL : (e));\ |
e88665cc CR |
130 | } \ |
131 | } while (0) | |
e05be32d | 132 | |
cce855bc | 133 | void |
a61ffa78 | 134 | redirection_error (REDIRECT *temp, int error, char *fn) |
cce855bc | 135 | { |
f73dda09 | 136 | char *filename, *allocname; |
bb70624e | 137 | int oflags; |
cce855bc | 138 | |
f73dda09 | 139 | allocname = 0; |
48abf0fd | 140 | if ((temp->rflags & REDIR_VARASSIGN) && error < 0) |
631b20c6 | 141 | filename = allocname = savestring (temp->redirector.filename->word); |
34ec1876 | 142 | else if ((temp->rflags & REDIR_VARASSIGN) == 0 && temp->redirector.dest < 0) |
f73dda09 JA |
143 | /* This can happen when read_token_word encounters overflow, like in |
144 | exec 4294967297>x */ | |
5e13499c | 145 | filename = _("file descriptor out of range"); |
f73dda09 | 146 | #ifdef EBADF |
10a4e415 | 147 | /* This error can never involve NOCLOBBER */ |
e6dfa717 | 148 | else if (error != NOCLOBBER_REDIRECT && temp->redirector.dest >= 0 && error == EBADF) |
7117c2d2 JA |
149 | { |
150 | /* If we're dealing with two file descriptors, we have to guess about | |
151 | which one is invalid; in the cases of r_{duplicating,move}_input and | |
152 | r_{duplicating,move}_output we're here because dup2() failed. */ | |
153 | switch (temp->instruction) | |
154 | { | |
155 | case r_duplicating_input: | |
156 | case r_duplicating_output: | |
157 | case r_move_input: | |
158 | case r_move_output: | |
159 | filename = allocname = itos (temp->redirectee.dest); | |
160 | break; | |
a8fd3f3e CR |
161 | case r_duplicating_input_word: |
162 | if (temp->redirector.dest == 0) /* Guess */ | |
163 | filename = temp->redirectee.filename->word; /* XXX */ | |
164 | else | |
165 | filename = allocname = itos (temp->redirector.dest); | |
166 | break; | |
167 | case r_duplicating_output_word: | |
168 | if (temp->redirector.dest == 1) /* Guess */ | |
169 | filename = temp->redirectee.filename->word; /* XXX */ | |
170 | else | |
171 | filename = allocname = itos (temp->redirector.dest); | |
172 | break; | |
7117c2d2 | 173 | default: |
e6dfa717 | 174 | filename = allocname = itos (temp->redirector.dest); |
7117c2d2 JA |
175 | break; |
176 | } | |
177 | } | |
f73dda09 | 178 | #endif |
f9df5355 CR |
179 | else if (fn) |
180 | filename = fn; | |
f73dda09 | 181 | else if (expandable_redirection_filename (temp)) |
cce855bc | 182 | { |
ad4aef08 | 183 | oflags = temp->redirectee.filename->flags; |
bb70624e | 184 | if (posixly_correct && interactive_shell == 0) |
ad4aef08 | 185 | temp->redirectee.filename->flags |= W_NOGLOB; |
b3958b3a | 186 | temp->redirectee.filename->flags |= W_NOCOMSUB|W_NOPROCSUB; |
f73dda09 | 187 | filename = allocname = redirection_expand (temp->redirectee.filename); |
ad4aef08 | 188 | temp->redirectee.filename->flags = oflags; |
cce855bc | 189 | if (filename == 0) |
f73dda09 | 190 | filename = temp->redirectee.filename->word; |
cce855bc | 191 | } |
f73dda09 | 192 | else if (temp->redirectee.dest < 0) |
7175a77f | 193 | filename = _("file descriptor out of range"); |
cce855bc | 194 | else |
f73dda09 | 195 | filename = allocname = itos (temp->redirectee.dest); |
cce855bc JA |
196 | |
197 | switch (error) | |
198 | { | |
199 | case AMBIGUOUS_REDIRECT: | |
5e13499c | 200 | internal_error (_("%s: ambiguous redirect"), filename); |
cce855bc JA |
201 | break; |
202 | ||
203 | case NOCLOBBER_REDIRECT: | |
5e13499c | 204 | internal_error (_("%s: cannot overwrite existing file"), filename); |
cce855bc JA |
205 | break; |
206 | ||
207 | #if defined (RESTRICTED_SHELL) | |
208 | case RESTRICTED_REDIRECT: | |
5e13499c | 209 | internal_error (_("%s: restricted: cannot redirect output"), filename); |
cce855bc JA |
210 | break; |
211 | #endif /* RESTRICTED_SHELL */ | |
212 | ||
213 | case HEREDOC_REDIRECT: | |
adfe6c99 | 214 | internal_error (_("cannot create temp file for here-document: %s"), strerror (heredoc_errno)); |
cce855bc JA |
215 | break; |
216 | ||
e6dfa717 | 217 | case BADVAR_REDIRECT: |
a8fd3f3e | 218 | internal_error (_("%s: cannot assign fd to variable"), filename); |
e6dfa717 CR |
219 | break; |
220 | ||
cce855bc JA |
221 | default: |
222 | internal_error ("%s: %s", filename, strerror (error)); | |
223 | break; | |
224 | } | |
225 | ||
f73dda09 | 226 | FREE (allocname); |
cce855bc JA |
227 | } |
228 | ||
d3a24ed2 CR |
229 | /* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually |
230 | make input and output file descriptors, otherwise just do whatever is | |
39feef01 | 231 | necessary for side effecting. flags & RX_UNDOABLE says to remember |
d3a24ed2 CR |
232 | how to undo the redirections later, if non-zero. If flags & RX_CLEXEC |
233 | is non-zero, file descriptors opened in do_redirection () have their | |
234 | close-on-exec flag set. */ | |
cce855bc | 235 | int |
a61ffa78 | 236 | do_redirections (REDIRECT *list, int flags) |
cce855bc JA |
237 | { |
238 | int error; | |
239 | REDIRECT *temp; | |
f9df5355 | 240 | char *fn; |
cce855bc | 241 | |
d3a24ed2 | 242 | if (flags & RX_UNDOABLE) |
cce855bc JA |
243 | { |
244 | if (redirection_undo_list) | |
245 | { | |
246 | dispose_redirects (redirection_undo_list); | |
247 | redirection_undo_list = (REDIRECT *)NULL; | |
248 | } | |
249 | if (exec_redirection_undo_list) | |
250 | dispose_exec_redirects (); | |
251 | } | |
252 | ||
253 | for (temp = list; temp; temp = temp->next) | |
254 | { | |
f9df5355 CR |
255 | fn = 0; |
256 | error = do_redirection_internal (temp, flags, &fn); | |
cce855bc JA |
257 | if (error) |
258 | { | |
f9df5355 CR |
259 | redirection_error (temp, error, fn); |
260 | FREE (fn); | |
cce855bc JA |
261 | return (error); |
262 | } | |
f9df5355 | 263 | FREE (fn); |
cce855bc JA |
264 | } |
265 | return (0); | |
266 | } | |
267 | ||
268 | /* Return non-zero if the redirection pointed to by REDIRECT has a | |
269 | redirectee.filename that can be expanded. */ | |
270 | static int | |
a61ffa78 | 271 | expandable_redirection_filename (REDIRECT *redirect) |
cce855bc JA |
272 | { |
273 | switch (redirect->instruction) | |
274 | { | |
275 | case r_output_direction: | |
276 | case r_appending_to: | |
277 | case r_input_direction: | |
278 | case r_inputa_direction: | |
279 | case r_err_and_out: | |
8943768b | 280 | case r_append_err_and_out: |
cce855bc JA |
281 | case r_input_output: |
282 | case r_output_force: | |
283 | case r_duplicating_input_word: | |
284 | case r_duplicating_output_word: | |
7117c2d2 JA |
285 | case r_move_input_word: |
286 | case r_move_output_word: | |
cce855bc JA |
287 | return 1; |
288 | ||
289 | default: | |
290 | return 0; | |
291 | } | |
292 | } | |
293 | ||
294 | /* Expand the word in WORD returning a string. If WORD expands to | |
295 | multiple words (or no words), then return NULL. */ | |
296 | char * | |
a61ffa78 | 297 | redirection_expand (WORD_DESC *word) |
cce855bc JA |
298 | { |
299 | char *result; | |
300 | WORD_LIST *tlist1, *tlist2; | |
bb70624e | 301 | WORD_DESC *w; |
1a81420a | 302 | int old; |
bb70624e JA |
303 | |
304 | w = copy_word (word); | |
305 | if (posixly_correct) | |
306 | w->flags |= W_NOSPLIT; | |
cce855bc | 307 | |
bb70624e | 308 | tlist1 = make_word_list (w, (WORD_LIST *)NULL); |
d3a24ed2 | 309 | expanding_redir = 1; |
1a81420a CR |
310 | /* Now that we've changed the variable search order to ignore the temp |
311 | environment, see if we need to change the cached IFS values. */ | |
312 | sv_ifs ("IFS"); | |
cce855bc | 313 | tlist2 = expand_words_no_vars (tlist1); |
d3a24ed2 | 314 | expanding_redir = 0; |
1a81420a CR |
315 | /* Now we need to change the variable search order back to include the temp |
316 | environment. We force the temp environment search by forcing | |
317 | executing_builtin to 1. This is what makes `read' get the right values | |
318 | for the IFS-related cached variables, for example. */ | |
319 | old = executing_builtin; | |
320 | executing_builtin = 1; | |
321 | sv_ifs ("IFS"); | |
322 | executing_builtin = old; | |
cce855bc JA |
323 | dispose_words (tlist1); |
324 | ||
1a81420a | 325 | if (tlist2 == 0 || tlist2->next) |
cce855bc JA |
326 | { |
327 | /* We expanded to no words, or to more than a single word. | |
328 | Dispose of the word list and return NULL. */ | |
329 | if (tlist2) | |
330 | dispose_words (tlist2); | |
331 | return ((char *)NULL); | |
332 | } | |
333 | result = string_list (tlist2); /* XXX savestring (tlist2->word->word)? */ | |
334 | dispose_words (tlist2); | |
335 | return (result); | |
336 | } | |
337 | ||
31321bf1 CR |
338 | /* Expand a here-document or here-string (determined by RI) contained in |
339 | REDIRECTEE and return the expanded document. If LENP is non-zero, put | |
340 | the length of the returned string into *LENP. | |
341 | ||
342 | This captures everything about expanding here-documents and here-strings: | |
343 | the returned document should be written directly to whatever file | |
344 | descriptor is specified. In particular, it adds a newline to the end of | |
345 | a here-string to preserve previous semantics. */ | |
346 | static char * | |
a61ffa78 | 347 | heredoc_expand (WORD_DESC *redirectee, enum r_instruction ri, size_t *lenp) |
7117c2d2 | 348 | { |
31321bf1 CR |
349 | char *document; |
350 | size_t dlen; | |
351 | int old; | |
352 | ||
353 | if (redirectee->word == 0 || redirectee->word[0] == '\0') | |
354 | { | |
355 | if (lenp) | |
356 | *lenp = 0; | |
357 | return (redirectee->word); | |
358 | } | |
7117c2d2 | 359 | |
31321bf1 CR |
360 | /* Quoted here documents are not expanded */ |
361 | if (ri != r_reading_string && (redirectee->flags & W_QUOTED)) | |
362 | { | |
363 | if (lenp) | |
364 | *lenp = STRLEN (redirectee->word); | |
365 | return (redirectee->word); | |
366 | } | |
367 | ||
3eb2d94a | 368 | expanding_redir = 1; |
1a81420a CR |
369 | /* Now that we've changed the variable search order to ignore the temp |
370 | environment, see if we need to change the cached IFS values. */ | |
371 | sv_ifs ("IFS"); | |
5e061bb0 | 372 | document = (ri == r_reading_string) ? expand_assignment_string_to_string (redirectee->word, 0) |
31321bf1 | 373 | : expand_string_to_string (redirectee->word, Q_HERE_DOCUMENT); |
3eb2d94a | 374 | expanding_redir = 0; |
1a81420a CR |
375 | /* Now we need to change the variable search order back to include the temp |
376 | environment. We force the temp environment search by forcing | |
377 | executing_builtin to 1. This is what makes `read' get the right values | |
378 | for the IFS-related cached variables, for example. */ | |
379 | old = executing_builtin; | |
380 | executing_builtin = 1; | |
381 | sv_ifs ("IFS"); | |
382 | executing_builtin = old; | |
383 | ||
31321bf1 CR |
384 | dlen = STRLEN (document); |
385 | /* XXX - Add trailing newline to here-string */ | |
386 | if (ri == r_reading_string) | |
7117c2d2 | 387 | { |
31321bf1 CR |
388 | document = xrealloc (document, dlen + 2); |
389 | document[dlen++] = '\n'; | |
390 | document[dlen] = '\0'; | |
7117c2d2 | 391 | } |
31321bf1 CR |
392 | if (lenp) |
393 | *lenp = dlen; | |
394 | ||
395 | return document; | |
396 | } | |
397 | ||
398 | /* Write HEREDOC (of length HDLEN) to FD, returning 0 on success and ERRNO on | |
399 | error. Don't handle interrupts. */ | |
400 | static int | |
b2613ad1 | 401 | heredoc_write (int fd, const char *heredoc, size_t herelen) |
31321bf1 CR |
402 | { |
403 | ssize_t nw; | |
404 | int e; | |
405 | ||
406 | errno = 0; | |
407 | nw = write (fd, heredoc, herelen); | |
7117c2d2 | 408 | e = errno; |
31321bf1 | 409 | if (nw != herelen) |
7117c2d2 JA |
410 | { |
411 | if (e == 0) | |
412 | e = ENOSPC; | |
413 | return e; | |
414 | } | |
415 | return 0; | |
31321bf1 | 416 | } |
7117c2d2 | 417 | |
31321bf1 CR |
418 | /* Create a temporary file or pipe holding the text of the here document |
419 | pointed to by REDIRECTEE, and return a file descriptor open for reading | |
420 | to it. Return -1 on any error, and make sure errno is set appropriately. */ | |
cce855bc | 421 | static int |
a61ffa78 | 422 | here_document_to_fd (WORD_DESC *redirectee, enum r_instruction ri) |
cce855bc | 423 | { |
31321bf1 CR |
424 | char *filename; |
425 | int r, fd, fd2, herepipe[2]; | |
cce855bc | 426 | char *document; |
31321bf1 | 427 | size_t document_len; |
5d31eaea CR |
428 | #if HEREDOC_PARANOID |
429 | struct stat st1, st2; | |
430 | #endif | |
cce855bc | 431 | |
31321bf1 CR |
432 | /* Expand the here-document/here-string first and then decide what to do. */ |
433 | document = heredoc_expand (redirectee, ri, &document_len); | |
cce855bc | 434 | |
31321bf1 CR |
435 | /* If we have a zero-length document, don't mess with a temp file */ |
436 | if (document_len == 0) | |
cce855bc | 437 | { |
31321bf1 CR |
438 | fd = open ("/dev/null", O_RDONLY); |
439 | r = errno; | |
440 | if (document != redirectee->word) | |
441 | FREE (document); | |
442 | errno = r; | |
443 | return fd; | |
cce855bc JA |
444 | } |
445 | ||
98300c94 CR |
446 | if (shell_compatibility_level <= 50) |
447 | goto use_tempfile; | |
448 | ||
449 | #if HEREDOC_PIPESIZE | |
31321bf1 CR |
450 | /* Try to use a pipe internal to this process if the document is shorter |
451 | than the system's pipe capacity (computed at build time). We want to | |
452 | write the entire document without write blocking. */ | |
5d31eaea | 453 | if (document_len <= HEREDOC_PIPESIZE) |
cce855bc | 454 | { |
31321bf1 | 455 | if (pipe (herepipe) < 0) |
cce855bc | 456 | { |
6e1ab9a3 | 457 | /* XXX - goto use_tempfile; ? */ |
31321bf1 CR |
458 | r = errno; |
459 | if (document != redirectee->word) | |
460 | free (document); | |
461 | errno = r; | |
462 | return (-1); | |
cce855bc | 463 | } |
5d31eaea CR |
464 | |
465 | #if defined (F_GETPIPE_SZ) | |
466 | if (fcntl (herepipe[1], F_GETPIPE_SZ, 0) < document_len) | |
467 | goto use_tempfile; | |
468 | #endif | |
469 | ||
31321bf1 CR |
470 | r = heredoc_write (herepipe[1], document, document_len); |
471 | if (document != redirectee->word) | |
472 | free (document); | |
473 | close (herepipe[1]); | |
474 | if (r) /* write error */ | |
cce855bc | 475 | { |
31321bf1 CR |
476 | close (herepipe[0]); |
477 | errno = r; | |
478 | return (-1); | |
f73dda09 | 479 | } |
31321bf1 | 480 | return (herepipe[0]); |
cce855bc | 481 | } |
31321bf1 | 482 | #endif |
cce855bc | 483 | |
5d31eaea CR |
484 | use_tempfile: |
485 | ||
d3ad40de | 486 | fd = sh_mktmpfd ("sh-thd", MT_USERANDOM|MT_USETMPDIR, &filename); |
cce855bc JA |
487 | |
488 | /* If we failed for some reason other than the file existing, abort */ | |
489 | if (fd < 0) | |
28ef6c31 | 490 | { |
31321bf1 | 491 | r = errno; |
28ef6c31 | 492 | FREE (filename); |
31321bf1 CR |
493 | if (document != redirectee->word) |
494 | FREE (document); | |
495 | errno = r; | |
28ef6c31 JA |
496 | return (fd); |
497 | } | |
cce855bc | 498 | |
941cd04a | 499 | fchmod (fd, S_IRUSR | S_IWUSR); |
571ba52b CR |
500 | SET_CLOSE_ON_EXEC (fd); |
501 | ||
cce855bc | 502 | errno = r = 0; /* XXX */ |
31321bf1 CR |
503 | r = heredoc_write (fd, document, document_len); |
504 | if (document != redirectee->word) | |
505 | FREE (document); | |
cce855bc | 506 | |
cce855bc JA |
507 | if (r) |
508 | { | |
bb70624e | 509 | close (fd); |
cce855bc | 510 | unlink (filename); |
28ef6c31 | 511 | free (filename); |
cce855bc JA |
512 | errno = r; |
513 | return (-1); | |
514 | } | |
515 | ||
bb70624e JA |
516 | /* In an attempt to avoid races, we close the first fd only after opening |
517 | the second. */ | |
cce855bc | 518 | /* Make the document really temporary. Also make it the input. */ |
54a1fa7c | 519 | fd2 = open (filename, O_RDONLY|O_BINARY, 0600); |
cce855bc | 520 | |
bb70624e | 521 | if (fd2 < 0) |
cce855bc JA |
522 | { |
523 | r = errno; | |
524 | unlink (filename); | |
28ef6c31 | 525 | free (filename); |
bb70624e | 526 | close (fd); |
cce855bc JA |
527 | errno = r; |
528 | return -1; | |
529 | } | |
530 | ||
5d31eaea CR |
531 | #if HEREDOC_PARANOID |
532 | /* We can use same_file here to check whether or not fd and fd2 refer to | |
533 | the same file, but we don't do that unless HEREDOC_PARANOID is defined. */ | |
534 | if (fstat (fd, &st1) < 0 || S_ISREG (st1.st_mode) == 0 || | |
535 | fstat (fd2, &st2) < 0 || S_ISREG (st2.st_mode) == 0 || | |
536 | same_file (filename, filename, &st1, &st2) == 0) | |
537 | { | |
538 | unlink (filename); | |
539 | free (filename); | |
540 | close (fd); | |
541 | close (fd2); | |
542 | errno = EEXIST; | |
543 | return -1; | |
544 | } | |
545 | #endif | |
546 | ||
bb70624e | 547 | close (fd); |
cce855bc JA |
548 | if (unlink (filename) < 0) |
549 | { | |
550 | r = errno; | |
bb70624e | 551 | close (fd2); |
28ef6c31 | 552 | free (filename); |
cce855bc JA |
553 | errno = r; |
554 | return (-1); | |
555 | } | |
556 | ||
28ef6c31 | 557 | free (filename); |
941cd04a CR |
558 | |
559 | fchmod (fd2, S_IRUSR); | |
bb70624e | 560 | return (fd2); |
cce855bc JA |
561 | } |
562 | ||
bb70624e JA |
563 | #define RF_DEVFD 1 |
564 | #define RF_DEVSTDERR 2 | |
565 | #define RF_DEVSTDIN 3 | |
566 | #define RF_DEVSTDOUT 4 | |
567 | #define RF_DEVTCP 5 | |
568 | #define RF_DEVUDP 6 | |
569 | ||
570 | /* A list of pattern/value pairs for filenames that the redirection | |
571 | code handles specially. */ | |
572 | static STRING_INT_ALIST _redir_special_filenames[] = { | |
573 | #if !defined (HAVE_DEV_FD) | |
574 | { "/dev/fd/[0-9]*", RF_DEVFD }, | |
575 | #endif | |
576 | #if !defined (HAVE_DEV_STDIN) | |
577 | { "/dev/stderr", RF_DEVSTDERR }, | |
578 | { "/dev/stdin", RF_DEVSTDIN }, | |
579 | { "/dev/stdout", RF_DEVSTDOUT }, | |
580 | #endif | |
581 | #if defined (NETWORK_REDIRECTIONS) | |
582 | { "/dev/tcp/*/*", RF_DEVTCP }, | |
583 | { "/dev/udp/*/*", RF_DEVUDP }, | |
584 | #endif | |
585 | { (char *)NULL, -1 } | |
586 | }; | |
587 | ||
588 | static int | |
a61ffa78 | 589 | redir_special_open (int spec, char *filename, int flags, int mode, enum r_instruction ri) |
bb70624e JA |
590 | { |
591 | int fd; | |
f73dda09 | 592 | #if !defined (HAVE_DEV_FD) |
7117c2d2 | 593 | intmax_t lfd; |
f73dda09 | 594 | #endif |
bb70624e JA |
595 | |
596 | fd = -1; | |
597 | switch (spec) | |
598 | { | |
599 | #if !defined (HAVE_DEV_FD) | |
600 | case RF_DEVFD: | |
b3038907 | 601 | if (all_digits (filename+8) && valid_number (filename+8, &lfd) && lfd == (int)lfd) |
f73dda09 JA |
602 | { |
603 | fd = lfd; | |
b0c16657 | 604 | fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); |
f73dda09 | 605 | } |
bb70624e JA |
606 | else |
607 | fd = AMBIGUOUS_REDIRECT; | |
608 | break; | |
609 | #endif | |
610 | ||
611 | #if !defined (HAVE_DEV_STDIN) | |
612 | case RF_DEVSTDIN: | |
b0c16657 | 613 | fd = fcntl (0, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
614 | break; |
615 | case RF_DEVSTDOUT: | |
b0c16657 | 616 | fd = fcntl (1, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
617 | break; |
618 | case RF_DEVSTDERR: | |
b0c16657 | 619 | fd = fcntl (2, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
620 | break; |
621 | #endif | |
622 | ||
623 | #if defined (NETWORK_REDIRECTIONS) | |
624 | case RF_DEVTCP: | |
625 | case RF_DEVUDP: | |
fc132f73 CR |
626 | #if defined (RESTRICTED_SHELL) |
627 | if (restricted) | |
628 | return (RESTRICTED_REDIRECT); | |
629 | #endif | |
bb70624e JA |
630 | #if defined (HAVE_NETWORK) |
631 | fd = netopen (filename); | |
632 | #else | |
5e13499c | 633 | internal_warning (_("/dev/(tcp|udp)/host/port not supported without networking")); |
bb70624e JA |
634 | fd = open (filename, flags, mode); |
635 | #endif | |
636 | break; | |
637 | #endif /* NETWORK_REDIRECTIONS */ | |
638 | } | |
639 | ||
640 | return fd; | |
641 | } | |
642 | ||
cce855bc JA |
643 | /* Open FILENAME with FLAGS in noclobber mode, hopefully avoiding most |
644 | race conditions and avoiding the problem where the file is replaced | |
645 | between the stat(2) and open(2). */ | |
646 | static int | |
b2613ad1 | 647 | noclobber_open (const char *filename, int flags, int mode, enum r_instruction ri) |
cce855bc JA |
648 | { |
649 | int r, fd; | |
650 | struct stat finfo, finfo2; | |
651 | ||
652 | /* If the file exists and is a regular file, return an error | |
653 | immediately. */ | |
654 | r = stat (filename, &finfo); | |
655 | if (r == 0 && (S_ISREG (finfo.st_mode))) | |
656 | return (NOCLOBBER_REDIRECT); | |
657 | ||
658 | /* If the file was not present (r != 0), make sure we open it | |
659 | exclusively so that if it is created before we open it, our open | |
660 | will fail. Make sure that we do not truncate an existing file. | |
661 | Note that we don't turn on O_EXCL unless the stat failed -- if | |
662 | the file was not a regular file, we leave O_EXCL off. */ | |
663 | flags &= ~O_TRUNC; | |
664 | if (r != 0) | |
665 | { | |
bb70624e | 666 | fd = open (filename, flags|O_EXCL, mode); |
cce855bc JA |
667 | return ((fd < 0 && errno == EEXIST) ? NOCLOBBER_REDIRECT : fd); |
668 | } | |
bb70624e | 669 | fd = open (filename, flags, mode); |
cce855bc JA |
670 | |
671 | /* If the open failed, return the file descriptor right away. */ | |
672 | if (fd < 0) | |
673 | return (errno == EEXIST ? NOCLOBBER_REDIRECT : fd); | |
674 | ||
675 | /* OK, the open succeeded, but the file may have been changed from a | |
676 | non-regular file to a regular file between the stat and the open. | |
677 | We are assuming that the O_EXCL open handles the case where FILENAME | |
678 | did not exist and is symlinked to an existing file between the stat | |
679 | and open. */ | |
680 | ||
681 | /* If we can open it and fstat the file descriptor, and neither check | |
682 | revealed that it was a regular file, and the file has not been replaced, | |
683 | return the file descriptor. */ | |
684 | if ((fstat (fd, &finfo2) == 0) && (S_ISREG (finfo2.st_mode) == 0) && | |
685 | r == 0 && (S_ISREG (finfo.st_mode) == 0) && | |
686 | same_file (filename, filename, &finfo, &finfo2)) | |
687 | return fd; | |
688 | ||
689 | /* The file has been replaced. badness. */ | |
690 | close (fd); | |
691 | errno = EEXIST; | |
692 | return (NOCLOBBER_REDIRECT); | |
693 | } | |
694 | ||
bb70624e | 695 | static int |
a61ffa78 | 696 | redir_open (char *filename, int flags, int mode, enum r_instruction ri) |
bb70624e | 697 | { |
208fdb50 | 698 | int fd, r, e; |
bb70624e JA |
699 | |
700 | r = find_string_in_alist (filename, _redir_special_filenames, 1); | |
701 | if (r >= 0) | |
702 | return (redir_special_open (r, filename, flags, mode, ri)); | |
703 | ||
704 | /* If we are in noclobber mode, you are not allowed to overwrite | |
705 | existing files. Check before opening. */ | |
28ef6c31 | 706 | if (noclobber && CLOBBERING_REDIRECT (ri)) |
bb70624e JA |
707 | { |
708 | fd = noclobber_open (filename, flags, mode, ri); | |
709 | if (fd == NOCLOBBER_REDIRECT) | |
710 | return (NOCLOBBER_REDIRECT); | |
711 | } | |
712 | else | |
713 | { | |
208fdb50 CR |
714 | do |
715 | { | |
716 | fd = open (filename, flags, mode); | |
717 | e = errno; | |
718 | if (fd < 0 && e == EINTR) | |
947f0491 CR |
719 | { |
720 | QUIT; | |
721 | run_pending_traps (); | |
722 | } | |
208fdb50 CR |
723 | errno = e; |
724 | } | |
725 | while (fd < 0 && errno == EINTR); | |
726 | ||
bb70624e JA |
727 | #if defined (AFS) |
728 | if ((fd < 0) && (errno == EACCES)) | |
4f00fe31 CR |
729 | { |
730 | fd = open (filename, flags & ~O_CREAT, mode); | |
731 | errno = EACCES; /* restore errno */ | |
732 | } | |
bb70624e JA |
733 | #endif /* AFS */ |
734 | } | |
735 | ||
736 | return fd; | |
737 | } | |
738 | ||
8c2fef19 | 739 | static int |
a61ffa78 | 740 | undoablefd (int fd) |
8c2fef19 CR |
741 | { |
742 | int clexec; | |
743 | ||
744 | clexec = fcntl (fd, F_GETFD, 0); | |
745 | if (clexec == -1 || (fd >= SHELL_FD_BASE && clexec == 1)) | |
746 | return 0; | |
747 | return 1; | |
748 | } | |
749 | ||
cce855bc JA |
750 | /* Do the specific redirection requested. Returns errno or one of the |
751 | special redirection errors (*_REDIRECT) in case of error, 0 on success. | |
39feef01 | 752 | If flags & RX_ACTIVE is zero, then just do whatever is necessary to |
d3a24ed2 CR |
753 | produce the appropriate side effects. flags & RX_UNDOABLE, if non-zero, |
754 | says to remember how to undo each redirection. If flags & RX_CLEXEC is | |
755 | non-zero, then we set all file descriptors > 2 that we open to be | |
f9df5355 CR |
756 | close-on-exec. FNP, if non-null is a pointer to a location where the |
757 | expanded filename is stored. The caller will free it. */ | |
cce855bc | 758 | static int |
a61ffa78 | 759 | do_redirection_internal (REDIRECT *redirect, int flags, char **fnp) |
cce855bc JA |
760 | { |
761 | WORD_DESC *redirectee; | |
bb70624e | 762 | int redir_fd, fd, redirector, r, oflags; |
7117c2d2 | 763 | intmax_t lfd; |
cce855bc JA |
764 | char *redirectee_word; |
765 | enum r_instruction ri; | |
766 | REDIRECT *new_redirect; | |
e6dfa717 | 767 | REDIRECTEE sd; |
cce855bc JA |
768 | |
769 | redirectee = redirect->redirectee.filename; | |
770 | redir_fd = redirect->redirectee.dest; | |
e6dfa717 | 771 | redirector = redirect->redirector.dest; |
cce855bc JA |
772 | ri = redirect->instruction; |
773 | ||
d3ad40de CR |
774 | if (redirect->flags & RX_INTERNAL) |
775 | flags |= RX_INTERNAL; | |
e225d5a9 | 776 | |
7117c2d2 | 777 | if (TRANSLATE_REDIRECT (ri)) |
cce855bc | 778 | { |
a8fd3f3e CR |
779 | /* We have [N]>&WORD[-] or [N]<&WORD[-] (or {V}>&WORD[-] or {V}<&WORD-). |
780 | and WORD, then translate the redirection into a new one and | |
781 | continue. */ | |
cce855bc JA |
782 | redirectee_word = redirection_expand (redirectee); |
783 | ||
7117c2d2 | 784 | /* XXX - what to do with [N]<&$w- where w is unset or null? ksh93 |
2047e285 CR |
785 | turns it into [N]<&- or [N]>&- and closes N. */ |
786 | if ((ri == r_move_input_word || ri == r_move_output_word) && redirectee_word == 0) | |
787 | { | |
788 | sd = redirect->redirector; | |
789 | rd.dest = 0; | |
790 | new_redirect = make_redirection (sd, r_close_this, rd, 0); | |
791 | } | |
fa1e3367 | 792 | else if (redirectee_word == 0) |
cce855bc JA |
793 | return (AMBIGUOUS_REDIRECT); |
794 | else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0') | |
795 | { | |
a8fd3f3e | 796 | sd = redirect->redirector; |
f73dda09 | 797 | rd.dest = 0; |
e6dfa717 | 798 | new_redirect = make_redirection (sd, r_close_this, rd, 0); |
cce855bc JA |
799 | } |
800 | else if (all_digits (redirectee_word)) | |
801 | { | |
a8fd3f3e | 802 | sd = redirect->redirector; |
b3038907 | 803 | if (valid_number (redirectee_word, &lfd) && (int)lfd == lfd) |
f73dda09 | 804 | rd.dest = lfd; |
cce855bc | 805 | else |
f73dda09 | 806 | rd.dest = -1; /* XXX */ |
7117c2d2 JA |
807 | switch (ri) |
808 | { | |
809 | case r_duplicating_input_word: | |
e6dfa717 | 810 | new_redirect = make_redirection (sd, r_duplicating_input, rd, 0); |
7117c2d2 JA |
811 | break; |
812 | case r_duplicating_output_word: | |
e6dfa717 | 813 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
7117c2d2 JA |
814 | break; |
815 | case r_move_input_word: | |
e6dfa717 | 816 | new_redirect = make_redirection (sd, r_move_input, rd, 0); |
7117c2d2 JA |
817 | break; |
818 | case r_move_output_word: | |
e6dfa717 | 819 | new_redirect = make_redirection (sd, r_move_output, rd, 0); |
7117c2d2 | 820 | break; |
9d80be9a CR |
821 | default: |
822 | break; /* shut up gcc */ | |
7117c2d2 | 823 | } |
cce855bc | 824 | } |
a8fd3f3e | 825 | else if (ri == r_duplicating_output_word && (redirect->rflags & REDIR_VARASSIGN) == 0 && redirector == 1) |
cce855bc | 826 | { |
a8fd3f3e | 827 | sd = redirect->redirector; |
28ef6c31 | 828 | rd.filename = make_bare_word (redirectee_word); |
e6dfa717 | 829 | new_redirect = make_redirection (sd, r_err_and_out, rd, 0); |
cce855bc JA |
830 | } |
831 | else | |
832 | { | |
833 | free (redirectee_word); | |
834 | return (AMBIGUOUS_REDIRECT); | |
835 | } | |
836 | ||
837 | free (redirectee_word); | |
838 | ||
839 | /* Set up the variables needed by the rest of the function from the | |
840 | new redirection. */ | |
841 | if (new_redirect->instruction == r_err_and_out) | |
842 | { | |
843 | char *alloca_hack; | |
844 | ||
845 | /* Copy the word without allocating any memory that must be | |
846 | explicitly freed. */ | |
847 | redirectee = (WORD_DESC *)alloca (sizeof (WORD_DESC)); | |
848 | xbcopy ((char *)new_redirect->redirectee.filename, | |
849 | (char *)redirectee, sizeof (WORD_DESC)); | |
850 | ||
851 | alloca_hack = (char *) | |
852 | alloca (1 + strlen (new_redirect->redirectee.filename->word)); | |
853 | redirectee->word = alloca_hack; | |
854 | strcpy (redirectee->word, new_redirect->redirectee.filename->word); | |
855 | } | |
856 | else | |
857 | /* It's guaranteed to be an integer, and shouldn't be freed. */ | |
858 | redirectee = new_redirect->redirectee.filename; | |
859 | ||
860 | redir_fd = new_redirect->redirectee.dest; | |
e6dfa717 | 861 | redirector = new_redirect->redirector.dest; |
cce855bc JA |
862 | ri = new_redirect->instruction; |
863 | ||
864 | /* Overwrite the flags element of the old redirect with the new value. */ | |
865 | redirect->flags = new_redirect->flags; | |
866 | dispose_redirects (new_redirect); | |
867 | } | |
868 | ||
869 | switch (ri) | |
870 | { | |
871 | case r_output_direction: | |
872 | case r_appending_to: | |
873 | case r_input_direction: | |
874 | case r_inputa_direction: | |
875 | case r_err_and_out: /* command &>filename */ | |
8943768b | 876 | case r_append_err_and_out: /* command &>> filename */ |
cce855bc JA |
877 | case r_input_output: |
878 | case r_output_force: | |
bb70624e | 879 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 JA |
880 | { |
881 | oflags = redirectee->flags; | |
882 | redirectee->flags |= W_NOGLOB; | |
883 | } | |
cce855bc | 884 | redirectee_word = redirection_expand (redirectee); |
bb70624e JA |
885 | if (posixly_correct && interactive_shell == 0) |
886 | redirectee->flags = oflags; | |
cce855bc JA |
887 | |
888 | if (redirectee_word == 0) | |
889 | return (AMBIGUOUS_REDIRECT); | |
890 | ||
891 | #if defined (RESTRICTED_SHELL) | |
892 | if (restricted && (WRITE_REDIRECT (ri))) | |
893 | { | |
894 | free (redirectee_word); | |
895 | return (RESTRICTED_REDIRECT); | |
896 | } | |
897 | #endif /* RESTRICTED_SHELL */ | |
898 | ||
bb70624e | 899 | fd = redir_open (redirectee_word, redirect->flags, 0666, ri); |
f9df5355 CR |
900 | if (fnp) |
901 | *fnp = redirectee_word; | |
902 | else | |
903 | free (redirectee_word); | |
cce855bc | 904 | |
fc132f73 | 905 | if (fd == NOCLOBBER_REDIRECT || fd == RESTRICTED_REDIRECT) |
28ef6c31 | 906 | return (fd); |
bb70624e | 907 | |
cce855bc JA |
908 | if (fd < 0) |
909 | return (errno); | |
910 | ||
d3a24ed2 | 911 | if (flags & RX_ACTIVE) |
cce855bc | 912 | { |
a8fd3f3e | 913 | if (redirect->rflags & REDIR_VARASSIGN) |
e88665cc CR |
914 | { |
915 | redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
89c77bc7 CR |
916 | r = errno; |
917 | if (redirector < 0) | |
918 | sys_error (_("redirection error: cannot duplicate fd")); | |
919 | REDIRECTION_ERROR (redirector, r, fd); | |
e88665cc | 920 | } |
a8fd3f3e | 921 | |
3fb16fce | 922 | if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose)) |
f73dda09 | 923 | { |
3fb16fce CR |
924 | /* Only setup to undo it if the thing to undo is active. We want |
925 | to autoclose if we are doing a varassign redirection and the | |
926 | varredir_close shell option is set, and we can't test | |
927 | redirector in this case since we just assigned it above. */ | |
928 | if (fd != redirector && (redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose) | |
929 | r = add_undo_close_redirect (redirector); | |
930 | else if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
e05be32d | 931 | r = add_undo_redirect (redirector, ri, -1); |
f73dda09 | 932 | else |
e05be32d | 933 | r = add_undo_close_redirect (redirector); |
e88665cc | 934 | REDIRECTION_ERROR (r, errno, fd); |
f73dda09 | 935 | } |
cce855bc | 936 | |
fc34b3a4 CR |
937 | /* inhibit call to sync_buffered_stream() for async processes */ |
938 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
939 | check_bash_input (redirector); | |
cce855bc | 940 | |
b709b946 CR |
941 | /* Make sure there is no pending output before we change the state |
942 | of the underlying file descriptor, since the builtins use stdio | |
943 | for output. */ | |
944 | if (redirector == 1 && fileno (stdout) == redirector) | |
53ac45a3 CR |
945 | { |
946 | fflush (stdout); | |
947 | fpurge (stdout); | |
948 | } | |
b246176e CR |
949 | else if (redirector == 2 && fileno (stderr) == redirector) |
950 | { | |
951 | fflush (stderr); | |
952 | fpurge (stderr); | |
953 | } | |
b709b946 | 954 | |
a8fd3f3e CR |
955 | if (redirect->rflags & REDIR_VARASSIGN) |
956 | { | |
957 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
958 | { | |
959 | close (redirector); | |
960 | close (fd); | |
961 | return (r); /* XXX */ | |
962 | } | |
963 | } | |
964 | else if ((fd != redirector) && (dup2 (fd, redirector) < 0)) | |
b4a17eba CR |
965 | { |
966 | close (fd); /* dup2 failed? must be fd limit issue */ | |
967 | return (errno); | |
968 | } | |
cce855bc | 969 | |
cce855bc JA |
970 | /* Do not change the buffered stream for an implicit redirection |
971 | of /dev/null to fd 0 for asynchronous commands without job | |
972 | control (r_inputa_direction). */ | |
973 | if (ri == r_input_direction || ri == r_input_output) | |
974 | duplicate_buffered_stream (fd, redirector); | |
cce855bc JA |
975 | |
976 | /* | |
977 | * If we're remembering, then this is the result of a while, for | |
978 | * or until loop with a loop redirection, or a function/builtin | |
979 | * executing in the parent shell with a redirection. In the | |
980 | * function/builtin case, we want to set all file descriptors > 2 | |
981 | * to be close-on-exec to duplicate the effect of the old | |
982 | * for i = 3 to NOFILE close(i) loop. In the case of the loops, | |
983 | * both sh and ksh leave the file descriptors open across execs. | |
984 | * The Posix standard mentions only the exec builtin. | |
985 | */ | |
d3a24ed2 | 986 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
987 | SET_CLOSE_ON_EXEC (redirector); |
988 | } | |
989 | ||
990 | if (fd != redirector) | |
991 | { | |
cce855bc JA |
992 | if (INPUT_REDIRECT (ri)) |
993 | close_buffered_fd (fd); | |
994 | else | |
cce855bc JA |
995 | close (fd); /* Don't close what we just opened! */ |
996 | } | |
997 | ||
998 | /* If we are hacking both stdout and stderr, do the stderr | |
a8fd3f3e | 999 | redirection here. XXX - handle {var} here? */ |
8943768b | 1000 | if (ri == r_err_and_out || ri == r_append_err_and_out) |
cce855bc | 1001 | { |
d3a24ed2 | 1002 | if (flags & RX_ACTIVE) |
cce855bc | 1003 | { |
d3a24ed2 | 1004 | if (flags & RX_UNDOABLE) |
8c2fef19 | 1005 | add_undo_redirect (2, ri, -1); |
cce855bc JA |
1006 | if (dup2 (1, 2) < 0) |
1007 | return (errno); | |
1008 | } | |
1009 | } | |
1010 | break; | |
1011 | ||
1012 | case r_reading_until: | |
1013 | case r_deblank_reading_until: | |
7117c2d2 | 1014 | case r_reading_string: |
cce855bc JA |
1015 | /* REDIRECTEE is a pointer to a WORD_DESC containing the text of |
1016 | the new input. Place it in a temporary file. */ | |
1017 | if (redirectee) | |
1018 | { | |
7117c2d2 | 1019 | fd = here_document_to_fd (redirectee, ri); |
cce855bc JA |
1020 | |
1021 | if (fd < 0) | |
1022 | { | |
1023 | heredoc_errno = errno; | |
1024 | return (HEREDOC_REDIRECT); | |
1025 | } | |
1026 | ||
a8fd3f3e | 1027 | if (redirect->rflags & REDIR_VARASSIGN) |
e88665cc CR |
1028 | { |
1029 | redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
89c77bc7 CR |
1030 | r = errno; |
1031 | if (redirector < 0) | |
1032 | sys_error (_("redirection error: cannot duplicate fd")); | |
1033 | REDIRECTION_ERROR (redirector, r, fd); | |
e88665cc | 1034 | } |
a8fd3f3e | 1035 | |
d3a24ed2 | 1036 | if (flags & RX_ACTIVE) |
cce855bc | 1037 | { |
3fb16fce | 1038 | if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose)) |
f73dda09 | 1039 | { |
3fb16fce CR |
1040 | /* Only setup to undo it if the thing to undo is active. |
1041 | Close if the right option is set and we are doing a | |
1042 | varassign redirection. */ | |
1043 | if (fd != redirector && (redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose) | |
1044 | r = add_undo_close_redirect (redirector); | |
1045 | else if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
e05be32d | 1046 | r = add_undo_redirect (redirector, ri, -1); |
f73dda09 | 1047 | else |
e05be32d | 1048 | r = add_undo_close_redirect (redirector); |
e88665cc | 1049 | REDIRECTION_ERROR (r, errno, fd); |
f73dda09 | 1050 | } |
cce855bc | 1051 | |
cce855bc | 1052 | check_bash_input (redirector); |
349e2104 | 1053 | |
a8fd3f3e CR |
1054 | if (redirect->rflags & REDIR_VARASSIGN) |
1055 | { | |
1056 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
1057 | { | |
1058 | close (redirector); | |
1059 | close (fd); | |
1060 | return (r); /* XXX */ | |
1061 | } | |
1062 | } | |
1063 | else if (fd != redirector && dup2 (fd, redirector) < 0) | |
cce855bc JA |
1064 | { |
1065 | r = errno; | |
1066 | close (fd); | |
1067 | return (r); | |
1068 | } | |
1069 | ||
cce855bc | 1070 | duplicate_buffered_stream (fd, redirector); |
cce855bc | 1071 | |
d3a24ed2 | 1072 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
1073 | SET_CLOSE_ON_EXEC (redirector); |
1074 | } | |
1075 | ||
bb70624e | 1076 | if (fd != redirector) |
bb70624e | 1077 | close_buffered_fd (fd); |
cce855bc JA |
1078 | } |
1079 | break; | |
1080 | ||
1081 | case r_duplicating_input: | |
1082 | case r_duplicating_output: | |
7117c2d2 JA |
1083 | case r_move_input: |
1084 | case r_move_output: | |
a8fd3f3e | 1085 | if ((flags & RX_ACTIVE) && (redirect->rflags & REDIR_VARASSIGN)) |
e88665cc CR |
1086 | { |
1087 | redirector = fcntl (redir_fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
89c77bc7 CR |
1088 | r = errno; |
1089 | if (redirector < 0) | |
1090 | sys_error (_("redirection error: cannot duplicate fd")); | |
1091 | REDIRECTION_ERROR (redirector, r, -1); | |
e88665cc | 1092 | } |
a8fd3f3e | 1093 | |
d3a24ed2 | 1094 | if ((flags & RX_ACTIVE) && (redir_fd != redirector)) |
cce855bc | 1095 | { |
3fb16fce | 1096 | if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose)) |
f73dda09 | 1097 | { |
3fb16fce CR |
1098 | /* Only setup to undo it if the thing to undo is active. |
1099 | Close if the right option is set and we are doing a | |
1100 | varassign redirection. */ | |
1101 | if ((redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose) | |
1102 | r = add_undo_close_redirect (redirector); | |
1103 | else if (fcntl (redirector, F_GETFD, 0) != -1) | |
e05be32d | 1104 | r = add_undo_redirect (redirector, ri, redir_fd); |
f73dda09 | 1105 | else |
e05be32d | 1106 | r = add_undo_close_redirect (redirector); |
e88665cc | 1107 | REDIRECTION_ERROR (r, errno, -1); |
f73dda09 | 1108 | } |
83509ab7 CR |
1109 | if ((flags & RX_UNDOABLE) && (ri == r_move_input || ri == r_move_output)) |
1110 | { | |
1111 | /* r_move_input and r_move_output add an additional close() | |
1112 | that needs to be undone */ | |
1113 | if (fcntl (redirector, F_GETFD, 0) != -1) | |
1114 | { | |
1115 | r = add_undo_redirect (redir_fd, r_close_this, -1); | |
1116 | REDIRECTION_ERROR (r, errno, -1); | |
1117 | } | |
1118 | } | |
349e2104 | 1119 | |
fc34b3a4 CR |
1120 | /* inhibit call to sync_buffered_stream() for async processes */ |
1121 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
1122 | check_bash_input (redirector); | |
349e2104 | 1123 | |
a8fd3f3e CR |
1124 | if (redirect->rflags & REDIR_VARASSIGN) |
1125 | { | |
1126 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
1127 | { | |
1128 | close (redirector); | |
1129 | return (r); /* XXX */ | |
1130 | } | |
1131 | } | |
cce855bc | 1132 | /* This is correct. 2>&1 means dup2 (1, 2); */ |
a8fd3f3e | 1133 | else if (dup2 (redir_fd, redirector) < 0) |
cce855bc JA |
1134 | return (errno); |
1135 | ||
7117c2d2 | 1136 | if (ri == r_duplicating_input || ri == r_move_input) |
cce855bc | 1137 | duplicate_buffered_stream (redir_fd, redirector); |
cce855bc JA |
1138 | |
1139 | /* First duplicate the close-on-exec state of redirectee. dup2 | |
1140 | leaves the flag unset on the new descriptor, which means it | |
1141 | stays open. Only set the close-on-exec bit for file descriptors | |
1142 | greater than 2 in any case, since 0-2 should always be open | |
f75912ae CR |
1143 | unless closed by something like `exec 2<&-'. It should always |
1144 | be safe to set fds > 2 to close-on-exec if they're being used to | |
1145 | save file descriptors < 2, since we don't need to preserve the | |
1146 | state of the close-on-exec flag for those fds -- they should | |
1147 | always be open. */ | |
cce855bc JA |
1148 | /* if ((already_set || set_unconditionally) && (ok_to_set)) |
1149 | set_it () */ | |
e225d5a9 | 1150 | #if 0 |
f75912ae | 1151 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || redir_fd < 2 || (flags & RX_CLEXEC)) && |
cce855bc | 1152 | (redirector > 2)) |
e225d5a9 CR |
1153 | #else |
1154 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || (redir_fd < 2 && (flags & RX_INTERNAL)) || (flags & RX_CLEXEC)) && | |
1155 | (redirector > 2)) | |
1156 | #endif | |
cce855bc | 1157 | SET_CLOSE_ON_EXEC (redirector); |
7117c2d2 | 1158 | |
a9fac3b2 CR |
1159 | /* When undoing saving of non-standard file descriptors (>=3) using |
1160 | file descriptors >= SHELL_FD_BASE, we set the saving fd to be | |
1161 | close-on-exec and use a flag to decide how to set close-on-exec | |
1162 | when the fd is restored. */ | |
084c952b | 1163 | if ((redirect->flags & RX_INTERNAL) && (redirect->flags & RX_SAVCLEXEC) && redirector >= 3 && (redir_fd >= SHELL_FD_BASE || (redirect->flags & RX_SAVEFD))) |
a9fac3b2 CR |
1164 | SET_OPEN_ON_EXEC (redirector); |
1165 | ||
7117c2d2 JA |
1166 | /* dup-and-close redirection */ |
1167 | if (ri == r_move_input || ri == r_move_output) | |
09767ff0 | 1168 | { |
8f714a7c CR |
1169 | xtrace_fdchk (redir_fd); |
1170 | ||
09767ff0 CR |
1171 | close (redir_fd); |
1172 | #if defined (COPROCESS_SUPPORT) | |
8e1a6eaa | 1173 | coproc_fdchk (redir_fd); /* XXX - loses coproc fds */ |
09767ff0 CR |
1174 | #endif |
1175 | } | |
cce855bc JA |
1176 | } |
1177 | break; | |
1178 | ||
1179 | case r_close_this: | |
d3a24ed2 | 1180 | if (flags & RX_ACTIVE) |
cce855bc | 1181 | { |
a8fd3f3e CR |
1182 | if (redirect->rflags & REDIR_VARASSIGN) |
1183 | { | |
1184 | redirector = redir_varvalue (redirect); | |
1185 | if (redirector < 0) | |
1186 | return AMBIGUOUS_REDIRECT; | |
1187 | } | |
1188 | ||
e05be32d | 1189 | r = 0; |
96b7e268 | 1190 | if (flags & RX_UNDOABLE) |
e88665cc | 1191 | { |
96b7e268 CR |
1192 | if (fcntl (redirector, F_GETFD, 0) != -1) |
1193 | r = add_undo_redirect (redirector, ri, -1); | |
1194 | else | |
1195 | r = add_undo_close_redirect (redirector); | |
e88665cc CR |
1196 | REDIRECTION_ERROR (r, errno, redirector); |
1197 | } | |
cce855bc | 1198 | |
09767ff0 | 1199 | #if defined (COPROCESS_SUPPORT) |
8e1a6eaa | 1200 | coproc_fdchk (redirector); |
09767ff0 | 1201 | #endif |
8f714a7c | 1202 | xtrace_fdchk (redirector); |
09767ff0 | 1203 | |
fc34b3a4 CR |
1204 | /* inhibit call to sync_buffered_stream() for async processes */ |
1205 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
1206 | check_bash_input (redirector); | |
8cb3d567 | 1207 | r = close_buffered_fd (redirector); |
fc34b3a4 | 1208 | |
8cb3d567 CR |
1209 | if (r < 0 && (flags & RX_INTERNAL) && (errno == EIO || errno == ENOSPC)) |
1210 | REDIRECTION_ERROR (r, errno, -1); | |
cce855bc JA |
1211 | } |
1212 | break; | |
1213 | ||
1214 | case r_duplicating_input_word: | |
1215 | case r_duplicating_output_word: | |
9d80be9a CR |
1216 | case r_move_input_word: |
1217 | case r_move_output_word: | |
cce855bc JA |
1218 | break; |
1219 | } | |
1220 | return (0); | |
1221 | } | |
1222 | ||
cce855bc JA |
1223 | /* Remember the file descriptor associated with the slot FD, |
1224 | on REDIRECTION_UNDO_LIST. Note that the list will be reversed | |
1225 | before it is executed. Any redirections that need to be undone | |
1226 | even if REDIRECTION_UNDO_LIST is discarded by the exec builtin | |
8c2fef19 CR |
1227 | are also saved on EXEC_REDIRECTION_UNDO_LIST. FDBASE says where to |
1228 | start the duplicating. If it's less than SHELL_FD_BASE, we're ok, | |
1229 | and can use SHELL_FD_BASE (-1 == don't care). If it's >= SHELL_FD_BASE, | |
1230 | we have to make sure we don't use fdbase to save a file descriptor, | |
1231 | since we're going to use it later (e.g., make sure we don't save fd 0 | |
1232 | to fd 10 if we have a redirection like 0<&10). If the value of fdbase | |
1233 | puts the process over its fd limit, causing fcntl to fail, we try | |
e88665cc | 1234 | again with SHELL_FD_BASE. Return 0 on success, -1 on error. */ |
cce855bc | 1235 | static int |
a61ffa78 | 1236 | add_undo_redirect (int fd, enum r_instruction ri, int fdbase) |
cce855bc | 1237 | { |
084c952b | 1238 | int new_fd, clexec_flag, savefd_flag; |
cce855bc | 1239 | REDIRECT *new_redirect, *closer, *dummy_redirect; |
e6dfa717 | 1240 | REDIRECTEE sd; |
cce855bc | 1241 | |
084c952b | 1242 | savefd_flag = 0; |
8c2fef19 CR |
1243 | new_fd = fcntl (fd, F_DUPFD, (fdbase < SHELL_FD_BASE) ? SHELL_FD_BASE : fdbase+1); |
1244 | if (new_fd < 0) | |
1245 | new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); | |
084c952b CR |
1246 | if (new_fd < 0) |
1247 | { | |
1248 | new_fd = fcntl (fd, F_DUPFD, 0); | |
1249 | savefd_flag = 1; | |
1250 | } | |
cce855bc JA |
1251 | |
1252 | if (new_fd < 0) | |
1253 | { | |
5e13499c | 1254 | sys_error (_("redirection error: cannot duplicate fd")); |
cce855bc JA |
1255 | return (-1); |
1256 | } | |
1257 | ||
1258 | clexec_flag = fcntl (fd, F_GETFD, 0); | |
1259 | ||
e6dfa717 | 1260 | sd.dest = new_fd; |
f73dda09 | 1261 | rd.dest = 0; |
e6dfa717 | 1262 | closer = make_redirection (sd, r_close_this, rd, 0); |
e225d5a9 | 1263 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1264 | dummy_redirect = copy_redirects (closer); |
1265 | ||
e6dfa717 | 1266 | sd.dest = fd; |
f73dda09 | 1267 | rd.dest = new_fd; |
28ef6c31 | 1268 | if (fd == 0) |
e6dfa717 | 1269 | new_redirect = make_redirection (sd, r_duplicating_input, rd, 0); |
28ef6c31 | 1270 | else |
e6dfa717 | 1271 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
e225d5a9 | 1272 | new_redirect->flags |= RX_INTERNAL; |
084c952b CR |
1273 | if (savefd_flag) |
1274 | new_redirect->flags |= RX_SAVEFD; | |
1275 | if (clexec_flag == 0 && fd >= 3 && (new_fd >= SHELL_FD_BASE || savefd_flag)) | |
a9fac3b2 | 1276 | new_redirect->flags |= RX_SAVCLEXEC; |
cce855bc JA |
1277 | new_redirect->next = closer; |
1278 | ||
1279 | closer->next = redirection_undo_list; | |
1280 | redirection_undo_list = new_redirect; | |
1281 | ||
1282 | /* Save redirections that need to be undone even if the undo list | |
1283 | is thrown away by the `exec' builtin. */ | |
1284 | add_exec_redirect (dummy_redirect); | |
1285 | ||
cac4cdbf CR |
1286 | /* experimental: if we're saving a redirection to undo for a file descriptor |
1287 | above SHELL_FD_BASE, add a redirection to be undone if the exec builtin | |
b0c16657 CR |
1288 | causes redirections to be discarded. There needs to be a difference |
1289 | between fds that are used to save other fds and then are the target of | |
510e20a2 | 1290 | user redirections and fds that are just the target of user redirections. |
b0c16657 CR |
1291 | We use the close-on-exec flag to tell the difference; fds > SHELL_FD_BASE |
1292 | that have the close-on-exec flag set are assumed to be fds used internally | |
1293 | to save others. */ | |
1294 | if (fd >= SHELL_FD_BASE && ri != r_close_this && clexec_flag) | |
cac4cdbf | 1295 | { |
e6dfa717 | 1296 | sd.dest = fd; |
cac4cdbf | 1297 | rd.dest = new_fd; |
e6dfa717 | 1298 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
b0c16657 CR |
1299 | new_redirect->flags |= RX_INTERNAL; |
1300 | ||
cac4cdbf | 1301 | add_exec_redirect (new_redirect); |
cac4cdbf CR |
1302 | } |
1303 | ||
cce855bc JA |
1304 | /* File descriptors used only for saving others should always be |
1305 | marked close-on-exec. Unfortunately, we have to preserve the | |
1306 | close-on-exec state of the file descriptor we are saving, since | |
1307 | fcntl (F_DUPFD) sets the new file descriptor to remain open | |
1308 | across execs. If, however, the file descriptor whose state we | |
1309 | are saving is <= 2, we can just set the close-on-exec flag, | |
1310 | because file descriptors 0-2 should always be open-on-exec, | |
1311 | and the restore above in do_redirection() will take care of it. */ | |
1312 | if (clexec_flag || fd < 3) | |
1313 | SET_CLOSE_ON_EXEC (new_fd); | |
a9fac3b2 CR |
1314 | else if (redirection_undo_list->flags & RX_SAVCLEXEC) |
1315 | SET_CLOSE_ON_EXEC (new_fd); | |
cce855bc JA |
1316 | |
1317 | return (0); | |
1318 | } | |
1319 | ||
1320 | /* Set up to close FD when we are finished with the current command | |
e88665cc | 1321 | and its redirections. Return 0 on success, -1 on error. */ |
e05be32d | 1322 | static int |
a61ffa78 | 1323 | add_undo_close_redirect (int fd) |
cce855bc JA |
1324 | { |
1325 | REDIRECT *closer; | |
e6dfa717 | 1326 | REDIRECTEE sd; |
cce855bc | 1327 | |
e6dfa717 | 1328 | sd.dest = fd; |
f73dda09 | 1329 | rd.dest = 0; |
e6dfa717 | 1330 | closer = make_redirection (sd, r_close_this, rd, 0); |
e225d5a9 | 1331 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1332 | closer->next = redirection_undo_list; |
1333 | redirection_undo_list = closer; | |
e05be32d CR |
1334 | |
1335 | return 0; | |
cce855bc JA |
1336 | } |
1337 | ||
1338 | static void | |
a61ffa78 | 1339 | add_exec_redirect (REDIRECT *dummy_redirect) |
cce855bc JA |
1340 | { |
1341 | dummy_redirect->next = exec_redirection_undo_list; | |
1342 | exec_redirection_undo_list = dummy_redirect; | |
1343 | } | |
1344 | ||
bb70624e JA |
1345 | /* Return 1 if the redirection specified by RI and REDIRECTOR alters the |
1346 | standard input. */ | |
1347 | static int | |
a61ffa78 | 1348 | stdin_redirection (enum r_instruction ri, int redirector) |
bb70624e JA |
1349 | { |
1350 | switch (ri) | |
1351 | { | |
1352 | case r_input_direction: | |
1353 | case r_inputa_direction: | |
1354 | case r_input_output: | |
1355 | case r_reading_until: | |
1356 | case r_deblank_reading_until: | |
7117c2d2 | 1357 | case r_reading_string: |
bb70624e JA |
1358 | return (1); |
1359 | case r_duplicating_input: | |
1360 | case r_duplicating_input_word: | |
1361 | case r_close_this: | |
1362 | return (redirector == 0); | |
1363 | case r_output_direction: | |
1364 | case r_appending_to: | |
1365 | case r_duplicating_output: | |
1366 | case r_err_and_out: | |
8943768b | 1367 | case r_append_err_and_out: |
bb70624e JA |
1368 | case r_output_force: |
1369 | case r_duplicating_output_word: | |
9d80be9a CR |
1370 | case r_move_input: |
1371 | case r_move_output: | |
1372 | case r_move_input_word: | |
1373 | case r_move_output_word: | |
bb70624e JA |
1374 | return (0); |
1375 | } | |
1376 | return (0); | |
1377 | } | |
1378 | ||
cce855bc JA |
1379 | /* Return non-zero if any of the redirections in REDIRS alter the standard |
1380 | input. */ | |
1381 | int | |
a61ffa78 | 1382 | stdin_redirects (REDIRECT *redirs) |
cce855bc JA |
1383 | { |
1384 | REDIRECT *rp; | |
1385 | int n; | |
1386 | ||
1387 | for (n = 0, rp = redirs; rp; rp = rp->next) | |
a8fd3f3e CR |
1388 | if ((rp->rflags & REDIR_VARASSIGN) == 0) |
1389 | n += stdin_redirection (rp->instruction, rp->redirector.dest); | |
cce855bc JA |
1390 | return n; |
1391 | } | |
a7ad477f | 1392 | /* bind_var_to_int handles array references */ |
a8fd3f3e | 1393 | static int |
a61ffa78 | 1394 | redir_varassign (REDIRECT *redir, int fd) |
a8fd3f3e CR |
1395 | { |
1396 | WORD_DESC *w; | |
1397 | SHELL_VAR *v; | |
1398 | ||
1399 | w = redir->redirector.filename; | |
046d0cc9 | 1400 | v = bind_var_to_int (w->word, fd, 0); |
a8fd3f3e CR |
1401 | if (v == 0 || readonly_p (v) || noassign_p (v)) |
1402 | return BADVAR_REDIRECT; | |
1403 | ||
c84e5202 | 1404 | stupidly_hack_special_variables (w->word); |
a8fd3f3e CR |
1405 | return 0; |
1406 | } | |
1407 | ||
a7ad477f | 1408 | /* Handles {array[ind]} for redirection words */ |
a8fd3f3e | 1409 | static int |
a61ffa78 | 1410 | redir_varvalue (REDIRECT *redir) |
a8fd3f3e CR |
1411 | { |
1412 | SHELL_VAR *v; | |
a7ad477f | 1413 | char *val, *w; |
a8fd3f3e CR |
1414 | intmax_t vmax; |
1415 | int i; | |
a7ad477f CR |
1416 | #if defined (ARRAY_VARS) |
1417 | char *sub; | |
1418 | int len, vr; | |
1419 | #endif | |
a8fd3f3e | 1420 | |
a7ad477f | 1421 | w = redir->redirector.filename->word; /* shorthand */ |
a8fd3f3e | 1422 | /* XXX - handle set -u here? */ |
a7ad477f | 1423 | #if defined (ARRAY_VARS) |
2171061f | 1424 | if (vr = valid_array_reference (w, 0)) |
80c3b1d4 | 1425 | { |
64a7a624 | 1426 | v = array_variable_part (w, 0, &sub, &len); |
80c3b1d4 | 1427 | } |
a7ad477f CR |
1428 | else |
1429 | #endif | |
80c3b1d4 CR |
1430 | { |
1431 | v = find_variable (w); | |
1432 | #if defined (ARRAY_VARS) | |
1433 | if (v == 0) | |
1434 | { | |
1435 | v = find_variable_last_nameref (w, 0); | |
1436 | if (v && nameref_p (v)) | |
1437 | { | |
1438 | w = nameref_cell (v); | |
1439 | if (vr = valid_array_reference (w, 0)) | |
64a7a624 | 1440 | v = array_variable_part (w, 0, &sub, &len); |
80c3b1d4 CR |
1441 | else |
1442 | v = find_variable (w); | |
1443 | } | |
1444 | } | |
1445 | #endif | |
1446 | } | |
1447 | ||
a8fd3f3e CR |
1448 | if (v == 0 || invisible_p (v)) |
1449 | return -1; | |
1450 | ||
a7ad477f CR |
1451 | #if defined (ARRAY_VARS) |
1452 | /* get_variable_value handles references to array variables without | |
1453 | subscripts */ | |
1454 | if (vr && (array_p (v) || assoc_p (v))) | |
b2b78a63 | 1455 | val = get_array_value (w, 0, (array_eltstate_t *)NULL); |
a7ad477f CR |
1456 | else |
1457 | #endif | |
a8fd3f3e CR |
1458 | val = get_variable_value (v); |
1459 | if (val == 0 || *val == 0) | |
1460 | return -1; | |
1461 | ||
b3038907 | 1462 | if (valid_number (val, &vmax) == 0) |
a8fd3f3e CR |
1463 | return -1; |
1464 | ||
1465 | i = vmax; /* integer truncation */ | |
1466 | return i; | |
1467 | } |