source: heimdal/trunk/lib/libedit/src/read.c

Last change on this file was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 16.1 KB
Line 
1/* $NetBSD: read.c,v 1.58 2011/02/18 20:53:05 christos Exp $ */
2
3/*-
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "config.h"
36#if !defined(lint) && !defined(SCCSID)
37#if 0
38static char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: read.c,v 1.58 2011/02/18 20:53:05 christos Exp $");
41#endif
42#endif /* not lint && not SCCSID */
43
44/*
45 * read.c: Clean this junk up! This is horrible code.
46 * Terminal read functions
47 */
48#include <errno.h>
49#include <fcntl.h>
50#include <unistd.h>
51#include <stdlib.h>
52#include <limits.h>
53#include "el.h"
54
55#define OKCMD -1 /* must be -1! */
56
57private int read__fixio(int, int);
58private int read_preread(EditLine *);
59private int read_char(EditLine *, Char *);
60private int read_getcmd(EditLine *, el_action_t *, Char *);
61private void read_pop(c_macro_t *);
62
63/* read_init():
64 * Initialize the read stuff
65 */
66protected int
67read_init(EditLine *el)
68{
69 /* builtin read_char */
70 el->el_read.read_char = read_char;
71 return 0;
72}
73
74
75/* el_read_setfn():
76 * Set the read char function to the one provided.
77 * If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
78 */
79protected int
80el_read_setfn(EditLine *el, el_rfunc_t rc)
81{
82 el->el_read.read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
83 return 0;
84}
85
86
87/* el_read_getfn():
88 * return the current read char function, or EL_BUILTIN_GETCFN
89 * if it is the default one
90 */
91protected el_rfunc_t
92el_read_getfn(EditLine *el)
93{
94 return (el->el_read.read_char == read_char) ?
95 EL_BUILTIN_GETCFN : el->el_read.read_char;
96}
97
98
99#ifndef MIN
100#define MIN(A,B) ((A) < (B) ? (A) : (B))
101#endif
102
103#ifdef DEBUG_EDIT
104private void
105read_debug(EditLine *el)
106{
107
108 if (el->el_line.cursor > el->el_line.lastchar)
109 (void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
110 if (el->el_line.cursor < el->el_line.buffer)
111 (void) fprintf(el->el_errfile, "cursor < buffer\r\n");
112 if (el->el_line.cursor > el->el_line.limit)
113 (void) fprintf(el->el_errfile, "cursor > limit\r\n");
114 if (el->el_line.lastchar > el->el_line.limit)
115 (void) fprintf(el->el_errfile, "lastchar > limit\r\n");
116 if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
117 (void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
118}
119#endif /* DEBUG_EDIT */
120
121
122/* read__fixio():
123 * Try to recover from a read error
124 */
125/* ARGSUSED */
126private int
127read__fixio(int fd __attribute__((__unused__)), int e)
128{
129
130 switch (e) {
131 case -1: /* Make sure that the code is reachable */
132
133#ifdef EWOULDBLOCK
134 case EWOULDBLOCK:
135#ifndef TRY_AGAIN
136#define TRY_AGAIN
137#endif
138#endif /* EWOULDBLOCK */
139
140#if defined(POSIX) && defined(EAGAIN)
141#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
142 case EAGAIN:
143#ifndef TRY_AGAIN
144#define TRY_AGAIN
145#endif
146#endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
147#endif /* POSIX && EAGAIN */
148
149 e = 0;
150#ifdef TRY_AGAIN
151#if defined(F_SETFL) && defined(O_NDELAY)
152 if ((e = fcntl(fd, F_GETFL, 0)) == -1)
153 return (-1);
154
155 if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
156 return (-1);
157 else
158 e = 1;
159#endif /* F_SETFL && O_NDELAY */
160
161#ifdef FIONBIO
162 {
163 int zero = 0;
164
165 if (ioctl(fd, FIONBIO, (ioctl_t) & zero) == -1)
166 return (-1);
167 else
168 e = 1;
169 }
170#endif /* FIONBIO */
171
172#endif /* TRY_AGAIN */
173 return (e ? 0 : -1);
174
175 case EINTR:
176 return (0);
177
178 default:
179 return (-1);
180 }
181}
182
183
184/* read_preread():
185 * Try to read the stuff in the input queue;
186 */
187private int
188read_preread(EditLine *el)
189{
190 int chrs = 0;
191
192 if (el->el_tty.t_mode == ED_IO)
193 return (0);
194
195#ifndef WIDECHAR
196/* FIONREAD attempts to buffer up multiple bytes, and to make that work
197 * properly with partial wide/UTF-8 characters would need some careful work. */
198#ifdef FIONREAD
199 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
200 if (chrs > 0) {
201 char buf[EL_BUFSIZ];
202
203 chrs = read(el->el_infd, buf,
204 (size_t) MIN(chrs, EL_BUFSIZ - 1));
205 if (chrs > 0) {
206 buf[chrs] = '\0';
207 el_push(el, buf);
208 }
209 }
210#endif /* FIONREAD */
211#endif
212 return (chrs > 0);
213}
214
215
216/* el_push():
217 * Push a macro
218 */
219public void
220FUN(el,push)(EditLine *el, const Char *str)
221{
222 c_macro_t *ma = &el->el_chared.c_macro;
223
224 if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
225 ma->level++;
226 if ((ma->macro[ma->level] = Strdup(str)) != NULL)
227 return;
228 ma->level--;
229 }
230 term_beep(el);
231 term__flush(el);
232}
233
234
235/* read_getcmd():
236 * Return next command from the input stream.
237 * Character values > 255 are not looked up in the map, but inserted.
238 */
239private int
240read_getcmd(EditLine *el, el_action_t *cmdnum, Char *ch)
241{
242 el_action_t cmd;
243 int num;
244
245 el->el_errno = 0;
246 do {
247 if ((num = FUN(el,getc)(el, ch)) != 1) {/* if EOF or error */
248 el->el_errno = num == 0 ? 0 : errno;
249 return (num);
250 }
251
252#ifdef KANJI
253 if ((*ch & 0200)) {
254 el->el_state.metanext = 0;
255 cmd = CcViMap[' '];
256 break;
257 } else
258#endif /* KANJI */
259
260 if (el->el_state.metanext) {
261 el->el_state.metanext = 0;
262 *ch |= 0200;
263 }
264#ifdef WIDECHAR
265 if (*ch >= N_KEYS)
266 cmd = ED_INSERT;
267 else
268#endif
269 cmd = el->el_map.current[(unsigned char) *ch];
270 if (cmd == ED_SEQUENCE_LEAD_IN) {
271 key_value_t val;
272 switch (key_get(el, ch, &val)) {
273 case XK_CMD:
274 cmd = val.cmd;
275 break;
276 case XK_STR:
277 FUN(el,push)(el, val.str);
278 break;
279#ifdef notyet
280 case XK_EXE:
281 /* XXX: In the future to run a user function */
282 RunCommand(val.str);
283 break;
284#endif
285 default:
286 EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
287 break;
288 }
289 }
290 if (el->el_map.alt == NULL)
291 el->el_map.current = el->el_map.key;
292 } while (cmd == ED_SEQUENCE_LEAD_IN);
293 *cmdnum = cmd;
294 return (OKCMD);
295}
296
297#ifdef WIDECHAR
298/* utf8_islead():
299 * Test whether a byte is a leading byte of a UTF-8 sequence.
300 */
301private int
302utf8_islead(unsigned char c)
303{
304 return (c < 0x80) || /* single byte char */
305 (c >= 0xc2 && c <= 0xf4); /* start of multibyte sequence */
306}
307#endif
308
309/* read_char():
310 * Read a character from the tty.
311 */
312private int
313read_char(EditLine *el, Char *cp)
314{
315 ssize_t num_read;
316 int tried = 0;
317 char cbuf[MB_LEN_MAX];
318 int cbp = 0;
319 int bytes = 0;
320
321 again:
322 el->el_signal->sig_no = 0;
323 while ((num_read = read(el->el_infd, cbuf + cbp, 1)) == -1) {
324 switch (el->el_signal->sig_no) {
325 case SIGCONT:
326 el_set(el, EL_REFRESH);
327 /*FALLTHROUGH*/
328 case SIGWINCH:
329 sig_set(el);
330 goto again;
331 default:
332 break;
333 }
334 if (!tried && read__fixio(el->el_infd, errno) == 0)
335 tried = 1;
336 else {
337 *cp = '\0';
338 return (-1);
339 }
340 }
341
342#ifdef WIDECHAR
343 if (el->el_flags & CHARSET_IS_UTF8) {
344 if (!utf8_islead((unsigned char)cbuf[0]))
345 goto again; /* discard the byte we read and try again */
346 ++cbp;
347 if ((bytes = ct_mbtowc(cp, cbuf, cbp)) == -1) {
348 ct_mbtowc_reset;
349 if (cbp >= MB_LEN_MAX) { /* "shouldn't happen" */
350 *cp = '\0';
351 return (-1);
352 }
353 goto again;
354 }
355 } else /* we don't support other multibyte charsets */
356#endif
357 *cp = (unsigned char)cbuf[0];
358
359 if ((el->el_flags & IGNORE_EXTCHARS) && bytes > 1) {
360 cbp = 0; /* skip this character */
361 goto again;
362 }
363
364 return (int)num_read;
365}
366
367/* read_pop():
368 * Pop a macro from the stack
369 */
370private void
371read_pop(c_macro_t *ma)
372{
373 int i;
374
375 el_free(ma->macro[0]);
376 for (i = 0; i < ma->level; i++)
377 ma->macro[i] = ma->macro[i + 1];
378 ma->level--;
379 ma->offset = 0;
380}
381
382/* el_getc():
383 * Read a character
384 */
385public int
386FUN(el,getc)(EditLine *el, Char *cp)
387{
388 int num_read;
389 c_macro_t *ma = &el->el_chared.c_macro;
390
391 term__flush(el);
392 for (;;) {
393 if (ma->level < 0) {
394 if (!read_preread(el))
395 break;
396 }
397
398 if (ma->level < 0)
399 break;
400
401 if (ma->macro[0][ma->offset] == '\0') {
402 read_pop(ma);
403 continue;
404 }
405
406 *cp = ma->macro[0][ma->offset++];
407
408 if (ma->macro[0][ma->offset] == '\0') {
409 /* Needed for QuoteMode On */
410 read_pop(ma);
411 }
412
413 return (1);
414 }
415
416#ifdef DEBUG_READ
417 (void) fprintf(el->el_errfile, "Turning raw mode on\n");
418#endif /* DEBUG_READ */
419 if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
420 return (0);
421
422#ifdef DEBUG_READ
423 (void) fprintf(el->el_errfile, "Reading a character\n");
424#endif /* DEBUG_READ */
425 num_read = (*el->el_read.read_char)(el, cp);
426#ifdef WIDECHAR
427 if (el->el_flags & NARROW_READ)
428 *cp = *(char *)(void *)cp;
429#endif
430#ifdef DEBUG_READ
431 (void) fprintf(el->el_errfile, "Got it %c\n", *cp);
432#endif /* DEBUG_READ */
433 return (num_read);
434}
435
436protected void
437read_prepare(EditLine *el)
438{
439 if (el->el_flags & HANDLE_SIGNALS)
440 sig_set(el);
441 if (el->el_flags & NO_TTY)
442 return;
443 if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
444 tty_rawmode(el);
445
446 /* This is relatively cheap, and things go terribly wrong if
447 we have the wrong size. */
448 el_resize(el);
449 re_clear_display(el); /* reset the display stuff */
450 ch_reset(el, 0);
451 re_refresh(el); /* print the prompt */
452
453 if (el->el_flags & UNBUFFERED)
454 term__flush(el);
455}
456
457protected void
458read_finish(EditLine *el)
459{
460 if ((el->el_flags & UNBUFFERED) == 0)
461 (void) tty_cookedmode(el);
462 if (el->el_flags & HANDLE_SIGNALS)
463 sig_clr(el);
464}
465
466public const Char *
467FUN(el,gets)(EditLine *el, int *nread)
468{
469 int retval;
470 el_action_t cmdnum = 0;
471 int num; /* how many chars we have read at NL */
472 Char ch, *cp;
473 int crlf = 0;
474 int nrb;
475#ifdef FIONREAD
476 c_macro_t *ma = &el->el_chared.c_macro;
477#endif /* FIONREAD */
478
479 if (nread == NULL)
480 nread = &nrb;
481 *nread = 0;
482
483 if (el->el_flags & NO_TTY) {
484 size_t idx;
485
486 cp = el->el_line.buffer;
487 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
488 /* make sure there is space for next character */
489 if (cp + 1 >= el->el_line.limit) {
490 idx = (cp - el->el_line.buffer);
491 if (!ch_enlargebufs(el, 2))
492 break;
493 cp = &el->el_line.buffer[idx];
494 }
495 cp++;
496 if (el->el_flags & UNBUFFERED)
497 break;
498 if (cp[-1] == '\r' || cp[-1] == '\n')
499 break;
500 }
501 if (num == -1) {
502 if (errno == EINTR)
503 cp = el->el_line.buffer;
504 el->el_errno = errno;
505 }
506
507 goto noedit;
508 }
509
510
511#ifdef FIONREAD
512 if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
513 long chrs = 0;
514
515 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
516 if (chrs == 0) {
517 if (tty_rawmode(el) < 0) {
518 errno = 0;
519 *nread = 0;
520 return (NULL);
521 }
522 }
523 }
524#endif /* FIONREAD */
525
526 if ((el->el_flags & UNBUFFERED) == 0)
527 read_prepare(el);
528
529 if (el->el_flags & EDIT_DISABLED) {
530 size_t idx;
531
532 if ((el->el_flags & UNBUFFERED) == 0)
533 cp = el->el_line.buffer;
534 else
535 cp = el->el_line.lastchar;
536
537 term__flush(el);
538
539 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
540 /* make sure there is space next character */
541 if (cp + 1 >= el->el_line.limit) {
542 idx = (cp - el->el_line.buffer);
543 if (!ch_enlargebufs(el, 2))
544 break;
545 cp = &el->el_line.buffer[idx];
546 }
547 cp++;
548 crlf = cp[-1] == '\r' || cp[-1] == '\n';
549 if (el->el_flags & UNBUFFERED)
550 break;
551 if (crlf)
552 break;
553 }
554
555 if (num == -1) {
556 if (errno == EINTR)
557 cp = el->el_line.buffer;
558 el->el_errno = errno;
559 }
560
561 goto noedit;
562 }
563
564 for (num = OKCMD; num == OKCMD;) { /* while still editing this
565 * line */
566#ifdef DEBUG_EDIT
567 read_debug(el);
568#endif /* DEBUG_EDIT */
569 /* if EOF or error */
570 if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
571#ifdef DEBUG_READ
572 (void) fprintf(el->el_errfile,
573 "Returning from el_gets %d\n", num);
574#endif /* DEBUG_READ */
575 break;
576 }
577 if (el->el_errno == EINTR) {
578 el->el_line.buffer[0] = '\0';
579 el->el_line.lastchar =
580 el->el_line.cursor = el->el_line.buffer;
581 break;
582 }
583 if ((unsigned int)cmdnum >= (unsigned int)el->el_map.nfunc) { /* BUG CHECK command */
584#ifdef DEBUG_EDIT
585 (void) fprintf(el->el_errfile,
586 "ERROR: illegal command from key 0%o\r\n", ch);
587#endif /* DEBUG_EDIT */
588 continue; /* try again */
589 }
590 /* now do the real command */
591#ifdef DEBUG_READ
592 {
593 el_bindings_t *b;
594 for (b = el->el_map.help; b->name; b++)
595 if (b->func == cmdnum)
596 break;
597 if (b->name)
598 (void) fprintf(el->el_errfile,
599 "Executing %s\n", b->name);
600 else
601 (void) fprintf(el->el_errfile,
602 "Error command = %d\n", cmdnum);
603 }
604#endif /* DEBUG_READ */
605 /* vi redo needs these way down the levels... */
606 el->el_state.thiscmd = cmdnum;
607 el->el_state.thisch = ch;
608 if (el->el_map.type == MAP_VI &&
609 el->el_map.current == el->el_map.key &&
610 el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
611 if (cmdnum == VI_DELETE_PREV_CHAR &&
612 el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
613 && Isprint(el->el_chared.c_redo.pos[-1]))
614 el->el_chared.c_redo.pos--;
615 else
616 *el->el_chared.c_redo.pos++ = ch;
617 }
618 retval = (*el->el_map.func[cmdnum]) (el, ch);
619#ifdef DEBUG_READ
620 (void) fprintf(el->el_errfile,
621 "Returned state %d\n", retval );
622#endif /* DEBUG_READ */
623
624 /* save the last command here */
625 el->el_state.lastcmd = cmdnum;
626
627 /* use any return value */
628 switch (retval) {
629 case CC_CURSOR:
630 re_refresh_cursor(el);
631 break;
632
633 case CC_REDISPLAY:
634 re_clear_lines(el);
635 re_clear_display(el);
636 /* FALLTHROUGH */
637
638 case CC_REFRESH:
639 re_refresh(el);
640 break;
641
642 case CC_REFRESH_BEEP:
643 re_refresh(el);
644 term_beep(el);
645 break;
646
647 case CC_NORM: /* normal char */
648 break;
649
650 case CC_ARGHACK: /* Suggested by Rich Salz */
651 /* <rsalz@pineapple.bbn.com> */
652 continue; /* keep going... */
653
654 case CC_EOF: /* end of file typed */
655 if ((el->el_flags & UNBUFFERED) == 0)
656 num = 0;
657 else if (num == -1) {
658 *el->el_line.lastchar++ = CONTROL('d');
659 el->el_line.cursor = el->el_line.lastchar;
660 num = 1;
661 }
662 break;
663
664 case CC_NEWLINE: /* normal end of line */
665 num = (int)(el->el_line.lastchar - el->el_line.buffer);
666 break;
667
668 case CC_FATAL: /* fatal error, reset to known state */
669#ifdef DEBUG_READ
670 (void) fprintf(el->el_errfile,
671 "*** editor fatal ERROR ***\r\n\n");
672#endif /* DEBUG_READ */
673 /* put (real) cursor in a known place */
674 re_clear_display(el); /* reset the display stuff */
675 ch_reset(el, 1); /* reset the input pointers */
676 re_refresh(el); /* print the prompt again */
677 break;
678
679 case CC_ERROR:
680 default: /* functions we don't know about */
681#ifdef DEBUG_READ
682 (void) fprintf(el->el_errfile,
683 "*** editor ERROR ***\r\n\n");
684#endif /* DEBUG_READ */
685 term_beep(el);
686 term__flush(el);
687 break;
688 }
689 el->el_state.argument = 1;
690 el->el_state.doingarg = 0;
691 el->el_chared.c_vcmd.action = NOP;
692 if (el->el_flags & UNBUFFERED)
693 break;
694 }
695
696 term__flush(el); /* flush any buffered output */
697 /* make sure the tty is set up correctly */
698 if ((el->el_flags & UNBUFFERED) == 0) {
699 read_finish(el);
700 *nread = num != -1 ? num : 0;
701 } else {
702 *nread = (int)(el->el_line.lastchar - el->el_line.buffer);
703 }
704 goto done;
705noedit:
706 el->el_line.cursor = el->el_line.lastchar = cp;
707 *cp = '\0';
708 *nread = (int)(el->el_line.cursor - el->el_line.buffer);
709done:
710 if (*nread == 0) {
711 if (num == -1) {
712 *nread = -1;
713 errno = el->el_errno;
714 }
715 return NULL;
716 } else
717 return el->el_line.buffer;
718}
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