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258e3d46 CR |
1 | This file is read.def, from which is created read.c. |
2 | It implements the builtin "read" in Bash. | |
3 | ||
9cbcc93b | 4 | Copyright (C) 1987-2008 Free Software Foundation, Inc. |
258e3d46 CR |
5 | |
6 | This file is part of GNU Bash, the Bourne Again SHell. | |
7 | ||
8 | Bash is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 2, or (at your option) any later | |
11 | version. | |
12 | ||
13 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License along | |
19 | with Bash; see the file COPYING. If not, write to the Free Software | |
20 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. | |
21 | ||
22 | $PRODUCES read.c | |
23 | ||
24 | $BUILTIN read | |
25 | $FUNCTION read_builtin | |
e6598ba4 | 26 | $SHORT_DOC read [-ers] [-a array] [-d delim] [-n nchars] [-p prompt] [-t timeout] [-u fd] [name ...] |
9cbcc93b CR |
27 | Reads a single line from the standard input, or from file descriptor FD |
28 | if the -u option is supplied. The line is split into fields as with word | |
29 | splitting, and the first word is assigned to the first NAME, the second | |
30 | word to the second NAME, and so on, with any leftover words assigned to | |
31 | the last NAME. Only the characters found in $IFS are recognized as word | |
32 | delimiters. | |
33 | ||
34 | If no NAMEs are supplied, the line read is stored in the REPLY variable. | |
35 | ||
36 | Options: | |
37 | -a array assign the words read to sequential indices of the array | |
38 | variable ARRAY, starting at zero | |
39 | -d delim continue until the first character of DELIM is read, rather | |
40 | than newline | |
41 | -e use Readline to obtain the line in an interactive shell | |
42 | -n nchars return after reading NCHARS characters rather than waiting | |
43 | for a newline | |
44 | -p prompt output the string PROMPT without a trailing newline before | |
45 | attempting to read | |
46 | -r do not allow backslashes to escape any characters | |
47 | -s do not echo input coming from a terminal | |
48 | -t timeout time out and return failure if a complete line of input is | |
49 | not read withint TIMEOUT seconds. The value of the TMOUT | |
50 | variable is the default timeout. | |
51 | -u fd read from file descriptor FD instead of the standard input | |
52 | ||
53 | The return code is zero, unless end-of-file is encountered, read times out, | |
54 | or an invalid file descriptor is supplied as the argument to -u. | |
258e3d46 CR |
55 | $END |
56 | ||
57 | #include <config.h> | |
58 | ||
59 | #include "bashtypes.h" | |
60 | #include "posixstat.h" | |
61 | ||
62 | #include <stdio.h> | |
63 | ||
64 | #if defined (HAVE_UNISTD_H) | |
65 | # include <unistd.h> | |
66 | #endif | |
67 | ||
68 | #include <signal.h> | |
69 | #include <errno.h> | |
70 | ||
71 | #ifdef __CYGWIN__ | |
72 | # include <fcntl.h> | |
73 | # include <io.h> | |
74 | #endif | |
75 | ||
76 | #include "../bashintl.h" | |
77 | ||
78 | #include "../shell.h" | |
79 | #include "common.h" | |
80 | #include "bashgetopt.h" | |
81 | ||
82 | #include <shtty.h> | |
83 | ||
84 | #if defined (READLINE) | |
85 | #include "../bashline.h" | |
86 | #include <readline/readline.h> | |
87 | #endif | |
88 | ||
89 | #if defined (BUFFERED_INPUT) | |
90 | # include "input.h" | |
91 | #endif | |
92 | ||
93 | #if !defined(errno) | |
94 | extern int errno; | |
95 | #endif | |
96 | ||
de00a878 CR |
97 | struct ttsave |
98 | { | |
99 | int fd; | |
100 | TTYSTRUCT *attrs; | |
101 | }; | |
102 | ||
258e3d46 CR |
103 | #if defined (READLINE) |
104 | static void reset_attempted_completion_function __P((char *)); | |
105 | static char *edit_line __P((char *)); | |
106 | static void set_eol_delim __P((int)); | |
107 | static void reset_eol_delim __P((char *)); | |
108 | #endif | |
109 | static SHELL_VAR *bind_read_variable __P((char *, char *)); | |
b0c16657 CR |
110 | #if defined (HANDLE_MULTIBYTE) |
111 | static int read_mbchar __P((int, char *, int, int, int)); | |
112 | #endif | |
de00a878 | 113 | static void ttyrestore __P((struct ttsave *)); |
258e3d46 CR |
114 | |
115 | static sighandler sigalrm __P((int)); | |
116 | static void reset_alarm __P((void)); | |
117 | ||
118 | static procenv_t alrmbuf; | |
119 | static SigHandler *old_alrm; | |
120 | static unsigned char delim; | |
121 | ||
122 | static sighandler | |
123 | sigalrm (s) | |
124 | int s; | |
125 | { | |
126 | longjmp (alrmbuf, 1); | |
127 | } | |
128 | ||
129 | static void | |
130 | reset_alarm () | |
131 | { | |
132 | set_signal_handler (SIGALRM, old_alrm); | |
133 | alarm (0); | |
134 | } | |
135 | ||
136 | /* Read the value of the shell variables whose names follow. | |
137 | The reading is done from the current input stream, whatever | |
138 | that may be. Successive words of the input line are assigned | |
139 | to the variables mentioned in LIST. The last variable in LIST | |
140 | gets the remainder of the words on the line. If no variables | |
141 | are mentioned in LIST, then the default variable is $REPLY. */ | |
142 | int | |
143 | read_builtin (list) | |
144 | WORD_LIST *list; | |
145 | { | |
146 | register char *varname; | |
e6598ba4 | 147 | int size, i, nr, pass_next, saw_escape, eof, opt, retval, code, print_ps2; |
b0c16657 | 148 | int input_is_tty, input_is_pipe, unbuffered_read, skip_ctlesc, skip_ctlnul; |
258e3d46 CR |
149 | int raw, edit, nchars, silent, have_timeout, fd; |
150 | unsigned int tmout; | |
151 | intmax_t intval; | |
152 | char c; | |
153 | char *input_string, *orig_input_string, *ifs_chars, *prompt, *arrayname; | |
97c2aab2 | 154 | char *e, *t, *t1, *ps2, *tofree; |
258e3d46 CR |
155 | struct stat tsb; |
156 | SHELL_VAR *var; | |
de00a878 CR |
157 | TTYSTRUCT ttattrs, ttset; |
158 | struct ttsave termsave; | |
258e3d46 CR |
159 | #if defined (ARRAY_VARS) |
160 | WORD_LIST *alist; | |
161 | #endif | |
162 | #if defined (READLINE) | |
163 | char *rlbuf; | |
164 | int rlind; | |
165 | #endif | |
166 | ||
167 | USE_VAR(size); | |
168 | USE_VAR(i); | |
169 | USE_VAR(pass_next); | |
e6598ba4 | 170 | USE_VAR(print_ps2); |
258e3d46 CR |
171 | USE_VAR(saw_escape); |
172 | USE_VAR(input_is_pipe); | |
173 | /* USE_VAR(raw); */ | |
174 | USE_VAR(edit); | |
175 | USE_VAR(tmout); | |
176 | USE_VAR(nchars); | |
177 | USE_VAR(silent); | |
178 | USE_VAR(ifs_chars); | |
179 | USE_VAR(prompt); | |
180 | USE_VAR(arrayname); | |
181 | #if defined (READLINE) | |
182 | USE_VAR(rlbuf); | |
183 | USE_VAR(rlind); | |
184 | #endif | |
185 | USE_VAR(list); | |
e6598ba4 | 186 | USE_VAR(ps2); |
258e3d46 CR |
187 | |
188 | i = 0; /* Index into the string that we are reading. */ | |
189 | raw = edit = 0; /* Not reading raw input by default. */ | |
190 | silent = 0; | |
191 | arrayname = prompt = (char *)NULL; | |
192 | fd = 0; /* file descriptor to read from */ | |
193 | ||
194 | #if defined (READLINE) | |
195 | rlbuf = (char *)0; | |
196 | rlind = 0; | |
197 | #endif | |
198 | ||
199 | tmout = 0; /* no timeout */ | |
200 | nr = nchars = input_is_tty = input_is_pipe = unbuffered_read = have_timeout = 0; | |
201 | delim = '\n'; /* read until newline */ | |
202 | ||
203 | reset_internal_getopt (); | |
204 | while ((opt = internal_getopt (list, "ersa:d:n:p:t:u:")) != -1) | |
205 | { | |
206 | switch (opt) | |
207 | { | |
208 | case 'r': | |
209 | raw = 1; | |
210 | break; | |
211 | case 'p': | |
212 | prompt = list_optarg; | |
213 | break; | |
214 | case 's': | |
215 | silent = 1; | |
216 | break; | |
217 | case 'e': | |
218 | #if defined (READLINE) | |
219 | edit = 1; | |
220 | #endif | |
221 | break; | |
222 | #if defined (ARRAY_VARS) | |
223 | case 'a': | |
224 | arrayname = list_optarg; | |
225 | break; | |
226 | #endif | |
227 | case 't': | |
228 | code = legal_number (list_optarg, &intval); | |
229 | if (code == 0 || intval < 0 || intval != (unsigned int)intval) | |
230 | { | |
231 | builtin_error (_("%s: invalid timeout specification"), list_optarg); | |
232 | return (EXECUTION_FAILURE); | |
233 | } | |
234 | else | |
235 | { | |
236 | have_timeout = 1; | |
237 | tmout = intval; | |
238 | } | |
239 | break; | |
240 | case 'n': | |
241 | code = legal_number (list_optarg, &intval); | |
242 | if (code == 0 || intval < 0 || intval != (int)intval) | |
243 | { | |
244 | sh_invalidnum (list_optarg); | |
245 | return (EXECUTION_FAILURE); | |
246 | } | |
247 | else | |
248 | nchars = intval; | |
249 | break; | |
250 | case 'u': | |
251 | code = legal_number (list_optarg, &intval); | |
252 | if (code == 0 || intval < 0 || intval != (int)intval) | |
253 | { | |
254 | builtin_error (_("%s: invalid file descriptor specification"), list_optarg); | |
255 | return (EXECUTION_FAILURE); | |
256 | } | |
257 | else | |
258 | fd = intval; | |
259 | if (sh_validfd (fd) == 0) | |
260 | { | |
261 | builtin_error (_("%d: invalid file descriptor: %s"), fd, strerror (errno)); | |
262 | return (EXECUTION_FAILURE); | |
263 | } | |
264 | break; | |
265 | case 'd': | |
266 | delim = *list_optarg; | |
267 | break; | |
268 | default: | |
269 | builtin_usage (); | |
270 | return (EX_USAGE); | |
271 | } | |
272 | } | |
273 | list = loptend; | |
274 | ||
275 | /* `read -t 0 var' returns failure immediately. XXX - should it test | |
276 | whether input is available with select/FIONREAD, and fail if those | |
277 | are unavailable? */ | |
278 | if (have_timeout && tmout == 0) | |
279 | return (EXECUTION_FAILURE); | |
280 | ||
281 | /* IF IFS is unset, we use the default of " \t\n". */ | |
282 | ifs_chars = getifs (); | |
283 | if (ifs_chars == 0) /* XXX - shouldn't happen */ | |
284 | ifs_chars = ""; | |
b0c16657 CR |
285 | for (skip_ctlesc = skip_ctlnul = 0, e = ifs_chars; *e; e++) |
286 | skip_ctlesc |= *e == CTLESC, skip_ctlnul |= *e == CTLNUL; | |
258e3d46 CR |
287 | |
288 | input_string = (char *)xmalloc (size = 112); /* XXX was 128 */ | |
289 | ||
290 | /* $TMOUT, if set, is the default timeout for read. */ | |
291 | if (have_timeout == 0 && (e = get_string_value ("TMOUT"))) | |
292 | { | |
293 | code = legal_number (e, &intval); | |
294 | if (code == 0 || intval < 0 || intval != (unsigned int)intval) | |
295 | tmout = 0; | |
296 | else | |
297 | tmout = intval; | |
298 | } | |
299 | ||
300 | begin_unwind_frame ("read_builtin"); | |
301 | ||
302 | #if defined (BUFFERED_INPUT) | |
303 | if (interactive == 0 && default_buffered_input >= 0 && fd_is_bash_input (fd)) | |
304 | sync_buffered_stream (default_buffered_input); | |
305 | #endif | |
306 | ||
307 | input_is_tty = isatty (fd); | |
308 | if (input_is_tty == 0) | |
309 | #ifndef __CYGWIN__ | |
310 | input_is_pipe = (lseek (fd, 0L, SEEK_CUR) < 0) && (errno == ESPIPE); | |
311 | #else | |
312 | input_is_pipe = 1; | |
313 | #endif | |
314 | ||
315 | /* If the -p, -e or -s flags were given, but input is not coming from the | |
316 | terminal, turn them off. */ | |
317 | if ((prompt || edit || silent) && input_is_tty == 0) | |
318 | { | |
319 | prompt = (char *)NULL; | |
320 | edit = silent = 0; | |
321 | } | |
322 | ||
323 | #if defined (READLINE) | |
324 | if (edit) | |
325 | add_unwind_protect (xfree, rlbuf); | |
326 | #endif | |
327 | ||
328 | if (prompt && edit == 0) | |
329 | { | |
330 | fprintf (stderr, "%s", prompt); | |
331 | fflush (stderr); | |
332 | } | |
333 | ||
334 | pass_next = 0; /* Non-zero signifies last char was backslash. */ | |
335 | saw_escape = 0; /* Non-zero signifies that we saw an escape char */ | |
336 | ||
337 | if (tmout > 0) | |
338 | { | |
339 | /* Turn off the timeout if stdin is a regular file (e.g. from | |
340 | input redirection). */ | |
341 | if ((fstat (fd, &tsb) < 0) || S_ISREG (tsb.st_mode)) | |
342 | tmout = 0; | |
343 | } | |
344 | ||
345 | if (tmout > 0) | |
346 | { | |
347 | code = setjmp (alrmbuf); | |
348 | if (code) | |
349 | { | |
4d8d005b | 350 | #if 0 |
258e3d46 CR |
351 | run_unwind_frame ("read_builtin"); |
352 | return (EXECUTION_FAILURE); | |
4d8d005b CR |
353 | #else |
354 | retval = EXECUTION_FAILURE; | |
355 | goto assign_vars; | |
356 | #endif | |
258e3d46 CR |
357 | } |
358 | old_alrm = set_signal_handler (SIGALRM, sigalrm); | |
359 | add_unwind_protect (reset_alarm, (char *)NULL); | |
360 | #if defined (READLINE) | |
361 | if (edit) | |
362 | add_unwind_protect (reset_attempted_completion_function, (char *)NULL); | |
363 | #endif | |
364 | alarm (tmout); | |
365 | } | |
366 | ||
367 | /* If we've been asked to read only NCHARS chars, or we're using some | |
368 | character other than newline to terminate the line, do the right | |
369 | thing to readline or the tty. */ | |
370 | if (nchars > 0 || delim != '\n') | |
371 | { | |
372 | #if defined (READLINE) | |
373 | if (edit) | |
374 | { | |
375 | if (nchars > 0) | |
376 | { | |
377 | unwind_protect_int (rl_num_chars_to_read); | |
378 | rl_num_chars_to_read = nchars; | |
379 | } | |
380 | if (delim != '\n') | |
381 | { | |
382 | set_eol_delim (delim); | |
383 | add_unwind_protect (reset_eol_delim, (char *)NULL); | |
384 | } | |
385 | } | |
386 | else | |
387 | #endif | |
388 | if (input_is_tty) | |
389 | { | |
de00a878 CR |
390 | /* ttsave() */ |
391 | termsave.fd = fd; | |
392 | ttgetattr (fd, &ttattrs); | |
393 | termsave.attrs = &ttattrs; | |
394 | ||
395 | ttset = ttattrs; | |
258e3d46 | 396 | if (silent) |
de00a878 | 397 | ttfd_cbreak (fd, &ttset); /* ttcbreak () */ |
258e3d46 | 398 | else |
de00a878 CR |
399 | ttfd_onechar (fd, &ttset); /* ttonechar () */ |
400 | add_unwind_protect ((Function *)ttyrestore, (char *)&termsave); | |
258e3d46 CR |
401 | } |
402 | } | |
403 | else if (silent) /* turn off echo but leave term in canonical mode */ | |
404 | { | |
de00a878 CR |
405 | /* ttsave (); */ |
406 | termsave.fd = fd; | |
407 | ttgetattr (fd, &ttattrs); | |
408 | termsave.attrs = &ttattrs; | |
409 | ||
410 | ttset = ttattrs; | |
411 | ttfd_noecho (fd, &ttset); /* ttnoecho (); */ | |
412 | ||
413 | add_unwind_protect ((Function *)ttyrestore, (char *)&termsave); | |
258e3d46 CR |
414 | } |
415 | ||
416 | /* This *must* be the top unwind-protect on the stack, so the manipulation | |
417 | of the unwind-protect stack after the realloc() works right. */ | |
418 | add_unwind_protect (xfree, input_string); | |
419 | interrupt_immediately++; | |
420 | terminate_immediately = 1; | |
421 | ||
422 | unbuffered_read = (nchars > 0) || (delim != '\n') || input_is_pipe; | |
423 | ||
424 | #if defined (__CYGWIN__) && defined (O_TEXT) | |
425 | setmode (0, O_TEXT); | |
426 | #endif | |
427 | ||
e6598ba4 CR |
428 | ps2 = 0; |
429 | for (print_ps2 = eof = retval = 0;;) | |
258e3d46 CR |
430 | { |
431 | #if defined (READLINE) | |
432 | if (edit) | |
433 | { | |
434 | if (rlbuf && rlbuf[rlind] == '\0') | |
435 | { | |
436 | xfree (rlbuf); | |
437 | rlbuf = (char *)0; | |
438 | } | |
439 | if (rlbuf == 0) | |
440 | { | |
441 | rlbuf = edit_line (prompt ? prompt : ""); | |
442 | rlind = 0; | |
443 | } | |
444 | if (rlbuf == 0) | |
445 | { | |
446 | eof = 1; | |
447 | break; | |
448 | } | |
449 | c = rlbuf[rlind++]; | |
450 | } | |
451 | else | |
452 | { | |
453 | #endif | |
454 | ||
e6598ba4 CR |
455 | if (print_ps2) |
456 | { | |
457 | if (ps2 == 0) | |
458 | ps2 = get_string_value ("PS2"); | |
459 | fprintf (stderr, "%s", ps2 ? ps2 : ""); | |
460 | fflush (stderr); | |
461 | print_ps2 = 0; | |
462 | } | |
463 | ||
258e3d46 CR |
464 | if (unbuffered_read) |
465 | retval = zread (fd, &c, 1); | |
466 | else | |
467 | retval = zreadc (fd, &c); | |
468 | ||
469 | if (retval <= 0) | |
470 | { | |
471 | eof = 1; | |
472 | break; | |
473 | } | |
474 | ||
475 | #if defined (READLINE) | |
476 | } | |
477 | #endif | |
478 | ||
b0c16657 | 479 | if (i + 4 >= size) /* XXX was i + 2; use i + 4 for multibyte/read_mbchar */ |
258e3d46 CR |
480 | { |
481 | input_string = (char *)xrealloc (input_string, size += 128); | |
482 | remove_unwind_protect (); | |
483 | add_unwind_protect (xfree, input_string); | |
484 | } | |
485 | ||
486 | /* If the next character is to be accepted verbatim, a backslash | |
487 | newline pair still disappears from the input. */ | |
488 | if (pass_next) | |
489 | { | |
490 | pass_next = 0; | |
491 | if (c == '\n') | |
e6598ba4 CR |
492 | { |
493 | i--; /* back up over the CTLESC */ | |
b0c16657 | 494 | if (interactive && input_is_tty && raw == 0) |
e6598ba4 CR |
495 | print_ps2 = 1; |
496 | } | |
258e3d46 CR |
497 | else |
498 | goto add_char; | |
499 | continue; | |
500 | } | |
501 | ||
e6598ba4 | 502 | /* This may cause problems if IFS contains CTLESC */ |
258e3d46 CR |
503 | if (c == '\\' && raw == 0) |
504 | { | |
505 | pass_next++; | |
e6598ba4 CR |
506 | if (skip_ctlesc == 0) |
507 | { | |
508 | saw_escape++; | |
509 | input_string[i++] = CTLESC; | |
510 | } | |
258e3d46 CR |
511 | continue; |
512 | } | |
513 | ||
514 | if ((unsigned char)c == delim) | |
515 | break; | |
516 | ||
b0c16657 | 517 | if ((skip_ctlesc == 0 && c == CTLESC) || (skip_ctlnul == 0 && c == CTLNUL)) |
258e3d46 CR |
518 | { |
519 | saw_escape++; | |
520 | input_string[i++] = CTLESC; | |
521 | } | |
522 | ||
523 | add_char: | |
524 | input_string[i++] = c; | |
b0c16657 CR |
525 | |
526 | #if defined (HANDLE_MULTIBYTE) | |
97c2aab2 | 527 | if (nchars > 0 && MB_CUR_MAX > 1) |
b0c16657 CR |
528 | { |
529 | input_string[i] = '\0'; /* for simplicity and debugging */ | |
530 | i += read_mbchar (fd, input_string, i, c, unbuffered_read); | |
531 | } | |
532 | #endif | |
533 | ||
258e3d46 CR |
534 | nr++; |
535 | ||
536 | if (nchars > 0 && nr >= nchars) | |
537 | break; | |
538 | } | |
539 | input_string[i] = '\0'; | |
540 | ||
541 | #if 1 | |
542 | if (retval < 0) | |
543 | { | |
544 | builtin_error (_("read error: %d: %s"), fd, strerror (errno)); | |
545 | run_unwind_frame ("read_builtin"); | |
546 | return (EXECUTION_FAILURE); | |
547 | } | |
548 | #endif | |
549 | ||
550 | if (tmout > 0) | |
551 | reset_alarm (); | |
552 | ||
553 | if (nchars > 0 || delim != '\n') | |
554 | { | |
555 | #if defined (READLINE) | |
556 | if (edit) | |
557 | { | |
558 | if (nchars > 0) | |
559 | rl_num_chars_to_read = 0; | |
560 | if (delim != '\n') | |
561 | reset_eol_delim ((char *)NULL); | |
562 | } | |
563 | else | |
564 | #endif | |
565 | if (input_is_tty) | |
4d8d005b | 566 | ttyrestore (&termsave); |
258e3d46 CR |
567 | } |
568 | else if (silent) | |
4d8d005b | 569 | ttyrestore (&termsave); |
258e3d46 CR |
570 | |
571 | if (unbuffered_read == 0) | |
572 | zsyncfd (fd); | |
573 | ||
574 | interrupt_immediately--; | |
575 | terminate_immediately = 0; | |
576 | discard_unwind_frame ("read_builtin"); | |
577 | ||
578 | retval = eof ? EXECUTION_FAILURE : EXECUTION_SUCCESS; | |
579 | ||
4d8d005b CR |
580 | assign_vars: |
581 | ||
258e3d46 CR |
582 | #if defined (ARRAY_VARS) |
583 | /* If -a was given, take the string read, break it into a list of words, | |
584 | an assign them to `arrayname' in turn. */ | |
585 | if (arrayname) | |
586 | { | |
587 | if (legal_identifier (arrayname) == 0) | |
588 | { | |
589 | sh_invalidid (arrayname); | |
590 | xfree (input_string); | |
591 | return (EXECUTION_FAILURE); | |
592 | } | |
593 | ||
594 | var = find_or_make_array_variable (arrayname, 1); | |
595 | if (var == 0) | |
596 | { | |
597 | xfree (input_string); | |
598 | return EXECUTION_FAILURE; /* readonly or noassign */ | |
599 | } | |
600 | array_flush (array_cell (var)); | |
601 | ||
602 | alist = list_string (input_string, ifs_chars, 0); | |
603 | if (alist) | |
604 | { | |
605 | if (saw_escape) | |
606 | dequote_list (alist); | |
607 | else | |
608 | word_list_remove_quoted_nulls (alist); | |
609 | assign_array_var_from_word_list (var, alist, 0); | |
610 | dispose_words (alist); | |
611 | } | |
612 | xfree (input_string); | |
613 | return (retval); | |
614 | } | |
615 | #endif /* ARRAY_VARS */ | |
616 | ||
617 | /* If there are no variables, save the text of the line read to the | |
618 | variable $REPLY. ksh93 strips leading and trailing IFS whitespace, | |
619 | so that `read x ; echo "$x"' and `read ; echo "$REPLY"' behave the | |
620 | same way, but I believe that the difference in behaviors is useful | |
621 | enough to not do it. Without the bash behavior, there is no way | |
622 | to read a line completely without interpretation or modification | |
623 | unless you mess with $IFS (e.g., setting it to the empty string). | |
624 | If you disagree, change the occurrences of `#if 0' to `#if 1' below. */ | |
625 | if (list == 0) | |
626 | { | |
627 | #if 0 | |
628 | orig_input_string = input_string; | |
629 | for (t = input_string; ifs_chars && *ifs_chars && spctabnl(*t) && isifs(*t); t++) | |
630 | ; | |
631 | input_string = t; | |
632 | input_string = strip_trailing_ifs_whitespace (input_string, ifs_chars, saw_escape); | |
633 | #endif | |
634 | ||
635 | if (saw_escape) | |
636 | { | |
637 | t = dequote_string (input_string); | |
638 | var = bind_variable ("REPLY", t, 0); | |
639 | free (t); | |
640 | } | |
641 | else | |
642 | var = bind_variable ("REPLY", input_string, 0); | |
643 | VUNSETATTR (var, att_invisible); | |
644 | ||
645 | free (input_string); | |
646 | return (retval); | |
647 | } | |
648 | ||
649 | /* This code implements the Posix.2 spec for splitting the words | |
650 | read and assigning them to variables. */ | |
651 | orig_input_string = input_string; | |
652 | ||
653 | /* Remove IFS white space at the beginning of the input string. If | |
654 | $IFS is null, no field splitting is performed. */ | |
655 | for (t = input_string; ifs_chars && *ifs_chars && spctabnl(*t) && isifs(*t); t++) | |
656 | ; | |
657 | input_string = t; | |
258e3d46 CR |
658 | for (; list->next; list = list->next) |
659 | { | |
660 | varname = list->word->word; | |
661 | #if defined (ARRAY_VARS) | |
662 | if (legal_identifier (varname) == 0 && valid_array_reference (varname) == 0) | |
663 | #else | |
664 | if (legal_identifier (varname) == 0) | |
665 | #endif | |
666 | { | |
667 | sh_invalidid (varname); | |
668 | xfree (orig_input_string); | |
669 | return (EXECUTION_FAILURE); | |
670 | } | |
671 | ||
672 | /* If there are more variables than words read from the input, | |
673 | the remaining variables are set to the empty string. */ | |
674 | if (*input_string) | |
675 | { | |
676 | /* This call updates INPUT_STRING. */ | |
677 | t = get_word_from_string (&input_string, ifs_chars, &e); | |
678 | if (t) | |
679 | *e = '\0'; | |
680 | /* Don't bother to remove the CTLESC unless we added one | |
681 | somewhere while reading the string. */ | |
682 | if (t && saw_escape) | |
683 | { | |
684 | t1 = dequote_string (t); | |
685 | var = bind_read_variable (varname, t1); | |
686 | xfree (t1); | |
687 | } | |
688 | else | |
689 | var = bind_read_variable (varname, t); | |
690 | } | |
691 | else | |
692 | { | |
693 | t = (char *)0; | |
694 | var = bind_read_variable (varname, ""); | |
695 | } | |
696 | ||
697 | FREE (t); | |
698 | if (var == 0) | |
699 | { | |
700 | xfree (orig_input_string); | |
701 | return (EXECUTION_FAILURE); | |
702 | } | |
703 | ||
704 | stupidly_hack_special_variables (varname); | |
705 | VUNSETATTR (var, att_invisible); | |
706 | } | |
707 | ||
708 | /* Now assign the rest of the line to the last variable argument. */ | |
709 | #if defined (ARRAY_VARS) | |
710 | if (legal_identifier (list->word->word) == 0 && valid_array_reference (list->word->word) == 0) | |
711 | #else | |
712 | if (legal_identifier (list->word->word) == 0) | |
713 | #endif | |
714 | { | |
715 | sh_invalidid (list->word->word); | |
716 | xfree (orig_input_string); | |
717 | return (EXECUTION_FAILURE); | |
718 | } | |
719 | ||
720 | #if 0 | |
721 | /* This has to be done this way rather than using string_list | |
722 | and list_string because Posix.2 says that the last variable gets the | |
723 | remaining words and their intervening separators. */ | |
724 | input_string = strip_trailing_ifs_whitespace (input_string, ifs_chars, saw_escape); | |
725 | #else | |
726 | /* Check whether or not the number of fields is exactly the same as the | |
727 | number of variables. */ | |
de00a878 | 728 | tofree = NULL; |
258e3d46 CR |
729 | if (*input_string) |
730 | { | |
731 | t1 = input_string; | |
de00a878 | 732 | t = get_word_from_string (&input_string, ifs_chars, &e); |
258e3d46 | 733 | if (*input_string == 0) |
de00a878 | 734 | tofree = input_string = t; |
258e3d46 CR |
735 | else |
736 | input_string = strip_trailing_ifs_whitespace (t1, ifs_chars, saw_escape); | |
737 | } | |
738 | #endif | |
739 | ||
740 | if (saw_escape) | |
741 | { | |
742 | t = dequote_string (input_string); | |
743 | var = bind_read_variable (list->word->word, t); | |
744 | xfree (t); | |
745 | } | |
746 | else | |
747 | var = bind_read_variable (list->word->word, input_string); | |
748 | stupidly_hack_special_variables (list->word->word); | |
de00a878 CR |
749 | FREE (tofree); |
750 | ||
258e3d46 CR |
751 | if (var) |
752 | VUNSETATTR (var, att_invisible); | |
753 | xfree (orig_input_string); | |
754 | ||
755 | return (retval); | |
756 | } | |
757 | ||
758 | static SHELL_VAR * | |
759 | bind_read_variable (name, value) | |
760 | char *name, *value; | |
761 | { | |
762 | #if defined (ARRAY_VARS) | |
763 | if (valid_array_reference (name) == 0) | |
764 | return (bind_variable (name, value, 0)); | |
765 | else | |
766 | return (assign_array_element (name, value, 0)); | |
767 | #else /* !ARRAY_VARS */ | |
768 | return bind_variable (name, value, 0); | |
769 | #endif /* !ARRAY_VARS */ | |
770 | } | |
771 | ||
b0c16657 CR |
772 | #if defined (HANDLE_MULTIBYTE) |
773 | static int | |
774 | read_mbchar (fd, string, ind, ch, unbuffered) | |
775 | int fd; | |
776 | char *string; | |
777 | int ind, ch, unbuffered; | |
778 | { | |
779 | char mbchar[MB_LEN_MAX + 1]; | |
780 | int i, n, r; | |
781 | char c; | |
782 | size_t ret; | |
783 | mbstate_t ps, ps_back; | |
784 | wchar_t wc; | |
785 | ||
786 | memset (&ps, '\0', sizeof (mbstate_t)); | |
787 | memset (&ps_back, '\0', sizeof (mbstate_t)); | |
788 | ||
789 | mbchar[0] = ch; | |
790 | i = 1; | |
791 | for (n = 0; n <= MB_LEN_MAX; n++) | |
792 | { | |
793 | ps_back = ps; | |
794 | ret = mbrtowc (&wc, mbchar, i, &ps); | |
795 | if (ret == (size_t)-2) | |
796 | { | |
797 | ps = ps_back; | |
798 | if (unbuffered) | |
799 | r = zread (fd, &c, 1); | |
800 | else | |
801 | r = zreadc (fd, &c); | |
802 | if (r < 0) | |
803 | goto mbchar_return; | |
804 | mbchar[i++] = c; | |
805 | continue; | |
806 | } | |
807 | else if (ret == (size_t)-1 || ret == (size_t)0 || ret > (size_t)0) | |
808 | break; | |
809 | } | |
810 | ||
811 | mbchar_return: | |
812 | if (i > 1) /* read a multibyte char */ | |
813 | /* mbchar[0] is already string[ind-1] */ | |
814 | for (r = 1; r < i; r++) | |
815 | string[ind+r-1] = mbchar[r]; | |
816 | return i - 1; | |
817 | } | |
818 | #endif | |
819 | ||
de00a878 CR |
820 | |
821 | static void | |
822 | ttyrestore (ttp) | |
823 | struct ttsave *ttp; | |
824 | { | |
825 | ttsetattr (ttp->fd, ttp->attrs); | |
826 | } | |
827 | ||
258e3d46 CR |
828 | #if defined (READLINE) |
829 | static rl_completion_func_t *old_attempted_completion_function = 0; | |
830 | ||
831 | static void | |
832 | reset_attempted_completion_function (cp) | |
833 | char *cp; | |
834 | { | |
835 | if (rl_attempted_completion_function == 0 && old_attempted_completion_function) | |
836 | rl_attempted_completion_function = old_attempted_completion_function; | |
837 | } | |
838 | ||
839 | static char * | |
840 | edit_line (p) | |
841 | char *p; | |
842 | { | |
843 | char *ret; | |
844 | int len; | |
845 | ||
846 | if (bash_readline_initialized == 0) | |
847 | initialize_readline (); | |
848 | ||
849 | old_attempted_completion_function = rl_attempted_completion_function; | |
850 | rl_attempted_completion_function = (rl_completion_func_t *)NULL; | |
851 | ret = readline (p); | |
852 | rl_attempted_completion_function = old_attempted_completion_function; | |
853 | old_attempted_completion_function = (rl_completion_func_t *)NULL; | |
854 | ||
855 | if (ret == 0) | |
856 | return ret; | |
857 | len = strlen (ret); | |
858 | ret = (char *)xrealloc (ret, len + 2); | |
859 | ret[len++] = delim; | |
860 | ret[len] = '\0'; | |
861 | return ret; | |
862 | } | |
863 | ||
864 | static int old_delim_ctype; | |
865 | static rl_command_func_t *old_delim_func; | |
866 | static int old_newline_ctype; | |
867 | static rl_command_func_t *old_newline_func; | |
868 | ||
869 | static unsigned char delim_char; | |
870 | ||
871 | static void | |
872 | set_eol_delim (c) | |
873 | int c; | |
874 | { | |
875 | Keymap cmap; | |
876 | ||
877 | if (bash_readline_initialized == 0) | |
878 | initialize_readline (); | |
879 | cmap = rl_get_keymap (); | |
880 | ||
881 | /* Change newline to self-insert */ | |
882 | old_newline_ctype = cmap[RETURN].type; | |
883 | old_newline_func = cmap[RETURN].function; | |
884 | cmap[RETURN].type = ISFUNC; | |
885 | cmap[RETURN].function = rl_insert; | |
886 | ||
887 | /* Bind the delimiter character to accept-line. */ | |
888 | old_delim_ctype = cmap[c].type; | |
889 | old_delim_func = cmap[c].function; | |
890 | cmap[c].type = ISFUNC; | |
891 | cmap[c].function = rl_newline; | |
892 | ||
893 | delim_char = c; | |
894 | } | |
895 | ||
896 | static void | |
897 | reset_eol_delim (cp) | |
898 | char *cp; | |
899 | { | |
900 | Keymap cmap; | |
901 | ||
902 | cmap = rl_get_keymap (); | |
903 | ||
904 | cmap[RETURN].type = old_newline_ctype; | |
905 | cmap[RETURN].function = old_newline_func; | |
906 | ||
907 | cmap[delim_char].type = old_delim_ctype; | |
908 | cmap[delim_char].function = old_delim_func; | |
909 | } | |
910 | #endif |