| 1 | /* input.c -- character input functions for readline. */ |
| 2 | |
| 3 | /* Copyright (C) 1994 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU Readline Library, a library for |
| 6 | reading lines of text with interactive input and history editing. |
| 7 | |
| 8 | The GNU Readline Library is free software; you can redistribute it |
| 9 | and/or modify it under the terms of the GNU General Public License |
| 10 | as published by the Free Software Foundation; either version 2, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | The GNU Readline Library is distributed in the hope that it will be |
| 14 | useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| 15 | of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | The GNU General Public License is often shipped with GNU software, and |
| 19 | is generally kept in a file called COPYING or LICENSE. If you do not |
| 20 | have a copy of the license, write to the Free Software Foundation, |
| 21 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
| 22 | #define READLINE_LIBRARY |
| 23 | |
| 24 | #if defined (HAVE_CONFIG_H) |
| 25 | # include <config.h> |
| 26 | #endif |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <fcntl.h> |
| 30 | #if defined (HAVE_SYS_FILE_H) |
| 31 | # include <sys/file.h> |
| 32 | #endif /* HAVE_SYS_FILE_H */ |
| 33 | |
| 34 | #if defined (HAVE_UNISTD_H) |
| 35 | # include <unistd.h> |
| 36 | #endif /* HAVE_UNISTD_H */ |
| 37 | |
| 38 | #if defined (HAVE_STDLIB_H) |
| 39 | # include <stdlib.h> |
| 40 | #else |
| 41 | # include "ansi_stdlib.h" |
| 42 | #endif /* HAVE_STDLIB_H */ |
| 43 | |
| 44 | #if defined (HAVE_SELECT) |
| 45 | # if !defined (HAVE_SYS_SELECT_H) || !defined (M_UNIX) |
| 46 | # include <sys/time.h> |
| 47 | # endif |
| 48 | #endif /* HAVE_SELECT */ |
| 49 | #if defined (HAVE_SYS_SELECT_H) |
| 50 | # include <sys/select.h> |
| 51 | #endif |
| 52 | |
| 53 | #if defined (FIONREAD_IN_SYS_IOCTL) |
| 54 | # include <sys/ioctl.h> |
| 55 | #endif |
| 56 | |
| 57 | #include <stdio.h> |
| 58 | #include <errno.h> |
| 59 | |
| 60 | #if !defined (errno) |
| 61 | extern int errno; |
| 62 | #endif /* !errno */ |
| 63 | |
| 64 | /* System-specific feature definitions and include files. */ |
| 65 | #include "rldefs.h" |
| 66 | #include "rlmbutil.h" |
| 67 | |
| 68 | /* Some standard library routines. */ |
| 69 | #include "readline.h" |
| 70 | |
| 71 | #include "rlprivate.h" |
| 72 | #include "rlshell.h" |
| 73 | #include "xmalloc.h" |
| 74 | |
| 75 | /* What kind of non-blocking I/O do we have? */ |
| 76 | #if !defined (O_NDELAY) && defined (O_NONBLOCK) |
| 77 | # define O_NDELAY O_NONBLOCK /* Posix style */ |
| 78 | #endif |
| 79 | |
| 80 | /* Non-null means it is a pointer to a function to run while waiting for |
| 81 | character input. */ |
| 82 | rl_hook_func_t *rl_event_hook = (rl_hook_func_t *)NULL; |
| 83 | |
| 84 | rl_getc_func_t *rl_getc_function = rl_getc; |
| 85 | |
| 86 | static int _keyboard_input_timeout = 100000; /* 0.1 seconds; it's in usec */ |
| 87 | |
| 88 | static int ibuffer_space PARAMS((void)); |
| 89 | static int rl_get_char PARAMS((int *)); |
| 90 | static int rl_gather_tyi PARAMS((void)); |
| 91 | |
| 92 | /* **************************************************************** */ |
| 93 | /* */ |
| 94 | /* Character Input Buffering */ |
| 95 | /* */ |
| 96 | /* **************************************************************** */ |
| 97 | |
| 98 | static int pop_index, push_index; |
| 99 | static unsigned char ibuffer[512]; |
| 100 | static int ibuffer_len = sizeof (ibuffer) - 1; |
| 101 | |
| 102 | #define any_typein (push_index != pop_index) |
| 103 | |
| 104 | int |
| 105 | _rl_any_typein () |
| 106 | { |
| 107 | return any_typein; |
| 108 | } |
| 109 | |
| 110 | /* Return the amount of space available in the buffer for stuffing |
| 111 | characters. */ |
| 112 | static int |
| 113 | ibuffer_space () |
| 114 | { |
| 115 | if (pop_index > push_index) |
| 116 | return (pop_index - push_index - 1); |
| 117 | else |
| 118 | return (ibuffer_len - (push_index - pop_index)); |
| 119 | } |
| 120 | |
| 121 | /* Get a key from the buffer of characters to be read. |
| 122 | Return the key in KEY. |
| 123 | Result is KEY if there was a key, or 0 if there wasn't. */ |
| 124 | static int |
| 125 | rl_get_char (key) |
| 126 | int *key; |
| 127 | { |
| 128 | if (push_index == pop_index) |
| 129 | return (0); |
| 130 | |
| 131 | *key = ibuffer[pop_index++]; |
| 132 | |
| 133 | if (pop_index >= ibuffer_len) |
| 134 | pop_index = 0; |
| 135 | |
| 136 | return (1); |
| 137 | } |
| 138 | |
| 139 | /* Stuff KEY into the *front* of the input buffer. |
| 140 | Returns non-zero if successful, zero if there is |
| 141 | no space left in the buffer. */ |
| 142 | int |
| 143 | _rl_unget_char (key) |
| 144 | int key; |
| 145 | { |
| 146 | if (ibuffer_space ()) |
| 147 | { |
| 148 | pop_index--; |
| 149 | if (pop_index < 0) |
| 150 | pop_index = ibuffer_len - 1; |
| 151 | ibuffer[pop_index] = key; |
| 152 | return (1); |
| 153 | } |
| 154 | return (0); |
| 155 | } |
| 156 | |
| 157 | /* If a character is available to be read, then read it and stuff it into |
| 158 | IBUFFER. Otherwise, just return. Returns number of characters read |
| 159 | (0 if none available) and -1 on error (EIO). */ |
| 160 | static int |
| 161 | rl_gather_tyi () |
| 162 | { |
| 163 | int tty; |
| 164 | register int tem, result; |
| 165 | int chars_avail; |
| 166 | char input; |
| 167 | #if defined(HAVE_SELECT) |
| 168 | fd_set readfds, exceptfds; |
| 169 | struct timeval timeout; |
| 170 | #endif |
| 171 | |
| 172 | tty = fileno (rl_instream); |
| 173 | |
| 174 | #if defined (HAVE_SELECT) |
| 175 | FD_ZERO (&readfds); |
| 176 | FD_ZERO (&exceptfds); |
| 177 | FD_SET (tty, &readfds); |
| 178 | FD_SET (tty, &exceptfds); |
| 179 | timeout.tv_sec = 0; |
| 180 | timeout.tv_usec = _keyboard_input_timeout; |
| 181 | result = select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout); |
| 182 | if (result <= 0) |
| 183 | return 0; /* Nothing to read. */ |
| 184 | #endif |
| 185 | |
| 186 | result = -1; |
| 187 | #if defined (FIONREAD) |
| 188 | errno = 0; |
| 189 | result = ioctl (tty, FIONREAD, &chars_avail); |
| 190 | if (result == -1 && errno == EIO) |
| 191 | return -1; |
| 192 | #endif |
| 193 | |
| 194 | #if defined (O_NDELAY) |
| 195 | if (result == -1) |
| 196 | { |
| 197 | tem = fcntl (tty, F_GETFL, 0); |
| 198 | |
| 199 | fcntl (tty, F_SETFL, (tem | O_NDELAY)); |
| 200 | chars_avail = read (tty, &input, 1); |
| 201 | |
| 202 | fcntl (tty, F_SETFL, tem); |
| 203 | if (chars_avail == -1 && errno == EAGAIN) |
| 204 | return 0; |
| 205 | } |
| 206 | #endif /* O_NDELAY */ |
| 207 | |
| 208 | /* If there's nothing available, don't waste time trying to read |
| 209 | something. */ |
| 210 | if (chars_avail <= 0) |
| 211 | return 0; |
| 212 | |
| 213 | tem = ibuffer_space (); |
| 214 | |
| 215 | if (chars_avail > tem) |
| 216 | chars_avail = tem; |
| 217 | |
| 218 | /* One cannot read all of the available input. I can only read a single |
| 219 | character at a time, or else programs which require input can be |
| 220 | thwarted. If the buffer is larger than one character, I lose. |
| 221 | Damn! */ |
| 222 | if (tem < ibuffer_len) |
| 223 | chars_avail = 0; |
| 224 | |
| 225 | if (result != -1) |
| 226 | { |
| 227 | while (chars_avail--) |
| 228 | rl_stuff_char ((*rl_getc_function) (rl_instream)); |
| 229 | } |
| 230 | else |
| 231 | { |
| 232 | if (chars_avail) |
| 233 | rl_stuff_char (input); |
| 234 | } |
| 235 | |
| 236 | return 1; |
| 237 | } |
| 238 | |
| 239 | int |
| 240 | rl_set_keyboard_input_timeout (u) |
| 241 | int u; |
| 242 | { |
| 243 | int o; |
| 244 | |
| 245 | o = _keyboard_input_timeout; |
| 246 | if (u > 0) |
| 247 | _keyboard_input_timeout = u; |
| 248 | return (o); |
| 249 | } |
| 250 | |
| 251 | /* Is there input available to be read on the readline input file |
| 252 | descriptor? Only works if the system has select(2) or FIONREAD. |
| 253 | Uses the value of _keyboard_input_timeout as the timeout; if another |
| 254 | readline function wants to specify a timeout and not leave it up to |
| 255 | the user, it should use _rl_input_queued(timeout_value_in_microseconds) |
| 256 | instead. */ |
| 257 | int |
| 258 | _rl_input_available () |
| 259 | { |
| 260 | #if defined(HAVE_SELECT) |
| 261 | fd_set readfds, exceptfds; |
| 262 | struct timeval timeout; |
| 263 | #endif |
| 264 | #if !defined (HAVE_SELECT) && defined(FIONREAD) |
| 265 | int chars_avail; |
| 266 | #endif |
| 267 | int tty; |
| 268 | |
| 269 | tty = fileno (rl_instream); |
| 270 | |
| 271 | #if defined (HAVE_SELECT) |
| 272 | FD_ZERO (&readfds); |
| 273 | FD_ZERO (&exceptfds); |
| 274 | FD_SET (tty, &readfds); |
| 275 | FD_SET (tty, &exceptfds); |
| 276 | timeout.tv_sec = 0; |
| 277 | timeout.tv_usec = _keyboard_input_timeout; |
| 278 | return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0); |
| 279 | #else |
| 280 | |
| 281 | #if defined (FIONREAD) |
| 282 | if (ioctl (tty, FIONREAD, &chars_avail) == 0) |
| 283 | return (chars_avail); |
| 284 | #endif |
| 285 | |
| 286 | #endif |
| 287 | |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | int |
| 292 | _rl_input_queued (t) |
| 293 | int t; |
| 294 | { |
| 295 | int old_timeout, r; |
| 296 | |
| 297 | old_timeout = rl_set_keyboard_input_timeout (t); |
| 298 | r = _rl_input_available (); |
| 299 | rl_set_keyboard_input_timeout (old_timeout); |
| 300 | return r; |
| 301 | } |
| 302 | |
| 303 | void |
| 304 | _rl_insert_typein (c) |
| 305 | int c; |
| 306 | { |
| 307 | int key, t, i; |
| 308 | char *string; |
| 309 | |
| 310 | i = key = 0; |
| 311 | string = (char *)xmalloc (ibuffer_len + 1); |
| 312 | string[i++] = (char) c; |
| 313 | |
| 314 | while ((t = rl_get_char (&key)) && |
| 315 | _rl_keymap[key].type == ISFUNC && |
| 316 | _rl_keymap[key].function == rl_insert) |
| 317 | string[i++] = key; |
| 318 | |
| 319 | if (t) |
| 320 | _rl_unget_char (key); |
| 321 | |
| 322 | string[i] = '\0'; |
| 323 | rl_insert_text (string); |
| 324 | free (string); |
| 325 | } |
| 326 | |
| 327 | /* Add KEY to the buffer of characters to be read. Returns 1 if the |
| 328 | character was stuffed correctly; 0 otherwise. */ |
| 329 | int |
| 330 | rl_stuff_char (key) |
| 331 | int key; |
| 332 | { |
| 333 | if (ibuffer_space () == 0) |
| 334 | return 0; |
| 335 | |
| 336 | if (key == EOF) |
| 337 | { |
| 338 | key = NEWLINE; |
| 339 | rl_pending_input = EOF; |
| 340 | RL_SETSTATE (RL_STATE_INPUTPENDING); |
| 341 | } |
| 342 | ibuffer[push_index++] = key; |
| 343 | if (push_index >= ibuffer_len) |
| 344 | push_index = 0; |
| 345 | |
| 346 | return 1; |
| 347 | } |
| 348 | |
| 349 | /* Make C be the next command to be executed. */ |
| 350 | int |
| 351 | rl_execute_next (c) |
| 352 | int c; |
| 353 | { |
| 354 | rl_pending_input = c; |
| 355 | RL_SETSTATE (RL_STATE_INPUTPENDING); |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | /* Clear any pending input pushed with rl_execute_next() */ |
| 360 | int |
| 361 | rl_clear_pending_input () |
| 362 | { |
| 363 | rl_pending_input = 0; |
| 364 | RL_UNSETSTATE (RL_STATE_INPUTPENDING); |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | /* **************************************************************** */ |
| 369 | /* */ |
| 370 | /* Character Input */ |
| 371 | /* */ |
| 372 | /* **************************************************************** */ |
| 373 | |
| 374 | /* Read a key, including pending input. */ |
| 375 | int |
| 376 | rl_read_key () |
| 377 | { |
| 378 | int c; |
| 379 | |
| 380 | rl_key_sequence_length++; |
| 381 | |
| 382 | if (rl_pending_input) |
| 383 | { |
| 384 | c = rl_pending_input; |
| 385 | rl_clear_pending_input (); |
| 386 | } |
| 387 | else |
| 388 | { |
| 389 | /* If input is coming from a macro, then use that. */ |
| 390 | if (c = _rl_next_macro_key ()) |
| 391 | return (c); |
| 392 | |
| 393 | /* If the user has an event function, then call it periodically. */ |
| 394 | if (rl_event_hook) |
| 395 | { |
| 396 | while (rl_event_hook && rl_get_char (&c) == 0) |
| 397 | { |
| 398 | (*rl_event_hook) (); |
| 399 | if (rl_done) /* XXX - experimental */ |
| 400 | return ('\n'); |
| 401 | if (rl_gather_tyi () < 0) /* XXX - EIO */ |
| 402 | { |
| 403 | rl_done = 1; |
| 404 | return ('\n'); |
| 405 | } |
| 406 | } |
| 407 | } |
| 408 | else |
| 409 | { |
| 410 | if (rl_get_char (&c) == 0) |
| 411 | c = (*rl_getc_function) (rl_instream); |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | return (c); |
| 416 | } |
| 417 | |
| 418 | int |
| 419 | rl_getc (stream) |
| 420 | FILE *stream; |
| 421 | { |
| 422 | int result; |
| 423 | unsigned char c; |
| 424 | |
| 425 | while (1) |
| 426 | { |
| 427 | result = read (fileno (stream), &c, sizeof (unsigned char)); |
| 428 | |
| 429 | if (result == sizeof (unsigned char)) |
| 430 | return (c); |
| 431 | |
| 432 | /* If zero characters are returned, then the file that we are |
| 433 | reading from is empty! Return EOF in that case. */ |
| 434 | if (result == 0) |
| 435 | return (EOF); |
| 436 | |
| 437 | #if defined (__BEOS__) |
| 438 | if (errno == EINTR) |
| 439 | continue; |
| 440 | #endif |
| 441 | |
| 442 | #if defined (EWOULDBLOCK) |
| 443 | # define X_EWOULDBLOCK EWOULDBLOCK |
| 444 | #else |
| 445 | # define X_EWOULDBLOCK -99 |
| 446 | #endif |
| 447 | |
| 448 | #if defined (EAGAIN) |
| 449 | # define X_EAGAIN EAGAIN |
| 450 | #else |
| 451 | # define X_EAGAIN -99 |
| 452 | #endif |
| 453 | |
| 454 | if (errno == X_EWOULDBLOCK || errno == X_EAGAIN) |
| 455 | { |
| 456 | if (sh_unset_nodelay_mode (fileno (stream)) < 0) |
| 457 | return (EOF); |
| 458 | continue; |
| 459 | } |
| 460 | |
| 461 | #undef X_EWOULDBLOCK |
| 462 | #undef X_EAGAIN |
| 463 | |
| 464 | /* If the error that we received was SIGINT, then try again, |
| 465 | this is simply an interrupted system call to read (). |
| 466 | Otherwise, some error ocurred, also signifying EOF. */ |
| 467 | if (errno != EINTR) |
| 468 | return (EOF); |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | #if defined (HANDLE_MULTIBYTE) |
| 473 | /* read multibyte char */ |
| 474 | int |
| 475 | _rl_read_mbchar (mbchar, size) |
| 476 | char *mbchar; |
| 477 | int size; |
| 478 | { |
| 479 | int mb_len = 0; |
| 480 | size_t mbchar_bytes_length; |
| 481 | wchar_t wc; |
| 482 | mbstate_t ps, ps_back; |
| 483 | |
| 484 | memset(&ps, 0, sizeof (mbstate_t)); |
| 485 | memset(&ps_back, 0, sizeof (mbstate_t)); |
| 486 | |
| 487 | while (mb_len < size) |
| 488 | { |
| 489 | RL_SETSTATE(RL_STATE_MOREINPUT); |
| 490 | mbchar[mb_len++] = rl_read_key (); |
| 491 | RL_UNSETSTATE(RL_STATE_MOREINPUT); |
| 492 | |
| 493 | mbchar_bytes_length = mbrtowc (&wc, mbchar, mb_len, &ps); |
| 494 | if (mbchar_bytes_length == (size_t)(-1)) |
| 495 | break; /* invalid byte sequence for the current locale */ |
| 496 | else if (mbchar_bytes_length == (size_t)(-2)) |
| 497 | { |
| 498 | /* shorted bytes */ |
| 499 | ps = ps_back; |
| 500 | continue; |
| 501 | } |
| 502 | else if (mbchar_bytes_length > (size_t)(0)) |
| 503 | break; |
| 504 | } |
| 505 | |
| 506 | return mb_len; |
| 507 | } |
| 508 | |
| 509 | /* Read a multibyte-character string whose first character is FIRST into |
| 510 | the buffer MB of length MBLEN. Returns the last character read, which |
| 511 | may be FIRST. Used by the search functions, among others. Very similar |
| 512 | to _rl_read_mbchar. */ |
| 513 | int |
| 514 | _rl_read_mbstring (first, mb, mblen) |
| 515 | int first; |
| 516 | char *mb; |
| 517 | int mblen; |
| 518 | { |
| 519 | int i, c; |
| 520 | mbstate_t ps; |
| 521 | |
| 522 | c = first; |
| 523 | memset (mb, 0, mblen); |
| 524 | for (i = 0; i < mblen; i++) |
| 525 | { |
| 526 | mb[i] = (char)c; |
| 527 | memset (&ps, 0, sizeof (mbstate_t)); |
| 528 | if (_rl_get_char_len (mb, &ps) == -2) |
| 529 | { |
| 530 | /* Read more for multibyte character */ |
| 531 | RL_SETSTATE (RL_STATE_MOREINPUT); |
| 532 | c = rl_read_key (); |
| 533 | RL_UNSETSTATE (RL_STATE_MOREINPUT); |
| 534 | } |
| 535 | else |
| 536 | break; |
| 537 | } |
| 538 | return c; |
| 539 | } |
| 540 | #endif /* HANDLE_MULTIBYTE */ |