1 /* $NetBSD: read.c,v 1.52 2009/07/22 15:57:00 christos Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
36 #if !defined(lint) && !defined(SCCSID)
38 static char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/4/93";
40 __RCSID("$NetBSD: read.c,v 1.52 2009/07/22 15:57:00 christos Exp $");
42 #endif /* not lint && not SCCSID */
45 * read.c: Clean this junk up! This is horrible code.
46 * Terminal read functions
54 #define OKCMD -1 /* must be -1! */
56 private int read__fixio(int, int);
57 private int read_preread(EditLine *);
58 private int read_char(EditLine *, char *);
59 private int read_getcmd(EditLine *, el_action_t *, char *);
60 private void read_pop(c_macro_t *);
63 * Initialize the read stuff
66 read_init(EditLine *el)
68 /* builtin read_char */
69 el->el_read.read_char = read_char;
75 * Set the read char function to the one provided.
76 * If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
79 el_read_setfn(EditLine *el, el_rfunc_t rc)
81 el->el_read.read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
87 * return the current read char function, or EL_BUILTIN_GETCFN
88 * if it is the default one
91 el_read_getfn(EditLine *el)
93 return (el->el_read.read_char == read_char) ?
94 EL_BUILTIN_GETCFN : el->el_read.read_char;
99 #define MIN(A,B) ((A) < (B) ? (A) : (B))
104 read_debug(EditLine *el)
107 if (el->el_line.cursor > el->el_line.lastchar)
108 (void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
109 if (el->el_line.cursor < el->el_line.buffer)
110 (void) fprintf(el->el_errfile, "cursor < buffer\r\n");
111 if (el->el_line.cursor > el->el_line.limit)
112 (void) fprintf(el->el_errfile, "cursor > limit\r\n");
113 if (el->el_line.lastchar > el->el_line.limit)
114 (void) fprintf(el->el_errfile, "lastchar > limit\r\n");
115 if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
116 (void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
118 #endif /* DEBUG_EDIT */
122 * Try to recover from a read error
126 read__fixio(int fd __attribute__((__unused__)), int e)
130 case -1: /* Make sure that the code is reachable */
137 #endif /* EWOULDBLOCK */
139 #if defined(POSIX) && defined(EAGAIN)
140 #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
145 #endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
146 #endif /* POSIX && EAGAIN */
150 #if defined(F_SETFL) && defined(O_NDELAY)
151 if ((e = fcntl(fd, F_GETFL, 0)) == -1)
154 if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
158 #endif /* F_SETFL && O_NDELAY */
164 if (ioctl(fd, FIONBIO, (ioctl_t) & zero) == -1)
171 #endif /* TRY_AGAIN */
184 * Try to read the stuff in the input queue;
187 read_preread(EditLine *el)
191 if (el->el_tty.t_mode == ED_IO)
195 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
199 chrs = read(el->el_infd, buf,
200 (size_t) MIN(chrs, EL_BUFSIZ - 1));
206 #endif /* FIONREAD */
216 el_push(EditLine *el, const char *str)
218 c_macro_t *ma = &el->el_chared.c_macro;
220 if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
222 if ((ma->macro[ma->level] = el_strdup(str)) != NULL)
232 * Return next command from the input stream.
235 read_getcmd(EditLine *el, el_action_t *cmdnum, char *ch)
242 if ((num = el_getc(el, ch)) != 1) { /* if EOF or error */
243 el->el_errno = num == 0 ? 0 : errno;
249 el->el_state.metanext = 0;
255 if (el->el_state.metanext) {
256 el->el_state.metanext = 0;
259 cmd = el->el_map.current[(unsigned char) *ch];
260 if (cmd == ED_SEQUENCE_LEAD_IN) {
262 switch (key_get(el, ch, &val)) {
267 el_push(el, val.str);
271 /* XXX: In the future to run a user function */
276 EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
280 if (el->el_map.alt == NULL)
281 el->el_map.current = el->el_map.key;
282 } while (cmd == ED_SEQUENCE_LEAD_IN);
289 * Read a character from the tty.
292 read_char(EditLine *el, char *cp)
298 el->el_signal->sig_no = 0;
299 while ((num_read = read(el->el_infd, cp, 1)) == -1) {
300 if (el->el_signal->sig_no == SIGCONT) {
302 el_set(el, EL_REFRESH);
305 if (!tried && read__fixio(el->el_infd, errno) == 0)
312 return (int)num_read;
316 * Pop a macro from the stack
319 read_pop(c_macro_t *ma)
323 el_free(ma->macro[0]);
324 for (i = 0; i < ma->level; i++)
325 ma->macro[i] = ma->macro[i + 1];
334 el_getc(EditLine *el, char *cp)
337 c_macro_t *ma = &el->el_chared.c_macro;
342 if (!read_preread(el))
349 if (ma->macro[0][ma->offset] == '\0') {
354 *cp = ma->macro[0][ma->offset++] & 0377;
356 if (ma->macro[0][ma->offset] == '\0') {
357 /* Needed for QuoteMode On */
365 (void) fprintf(el->el_errfile, "Turning raw mode on\n");
366 #endif /* DEBUG_READ */
367 if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
371 (void) fprintf(el->el_errfile, "Reading a character\n");
372 #endif /* DEBUG_READ */
373 num_read = (*el->el_read.read_char)(el, cp);
375 (void) fprintf(el->el_errfile, "Got it %c\n", *cp);
376 #endif /* DEBUG_READ */
381 read_prepare(EditLine *el)
383 if (el->el_flags & HANDLE_SIGNALS)
385 if (el->el_flags & NO_TTY)
387 if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
390 /* This is relatively cheap, and things go terribly wrong if
391 we have the wrong size. */
393 re_clear_display(el); /* reset the display stuff */
395 re_refresh(el); /* print the prompt */
397 if (el->el_flags & UNBUFFERED)
402 read_finish(EditLine *el)
404 if ((el->el_flags & UNBUFFERED) == 0)
405 (void) tty_cookedmode(el);
406 if (el->el_flags & HANDLE_SIGNALS)
411 el_gets(EditLine *el, int *nread)
414 el_action_t cmdnum = 0;
415 int num; /* how many chars we have read at NL */
420 c_macro_t *ma = &el->el_chared.c_macro;
421 #endif /* FIONREAD */
427 if (el->el_flags & NO_TTY) {
428 char *cp = el->el_line.buffer;
431 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
432 /* make sure there is space for next character */
433 if (cp + 1 >= el->el_line.limit) {
434 idx = (cp - el->el_line.buffer);
435 if (!ch_enlargebufs(el, 2))
437 cp = &el->el_line.buffer[idx];
440 if (el->el_flags & UNBUFFERED)
442 if (cp[-1] == '\r' || cp[-1] == '\n')
447 cp = el->el_line.buffer;
448 el->el_errno = errno;
451 el->el_line.cursor = el->el_line.lastchar = cp;
453 *nread = (int)(el->el_line.cursor - el->el_line.buffer);
459 if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
462 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
464 if (tty_rawmode(el) < 0) {
471 #endif /* FIONREAD */
473 if ((el->el_flags & UNBUFFERED) == 0)
476 if (el->el_flags & EDIT_DISABLED) {
480 if ((el->el_flags & UNBUFFERED) == 0)
481 cp = el->el_line.buffer;
483 cp = el->el_line.lastchar;
487 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
488 /* make sure there is space next character */
489 if (cp + 1 >= el->el_line.limit) {
490 idx = (cp - el->el_line.buffer);
491 if (!ch_enlargebufs(el, 2))
493 cp = &el->el_line.buffer[idx];
496 crlf = cp[-1] == '\r' || cp[-1] == '\n';
497 if (el->el_flags & UNBUFFERED)
505 cp = el->el_line.buffer;
506 el->el_errno = errno;
509 el->el_line.cursor = el->el_line.lastchar = cp;
514 for (num = OKCMD; num == OKCMD;) { /* while still editing this
518 #endif /* DEBUG_EDIT */
519 /* if EOF or error */
520 if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
522 (void) fprintf(el->el_errfile,
523 "Returning from el_gets %d\n", num);
524 #endif /* DEBUG_READ */
527 if (el->el_errno == EINTR) {
528 el->el_line.buffer[0] = '\0';
529 el->el_line.lastchar =
530 el->el_line.cursor = el->el_line.buffer;
533 if ((unsigned int)cmdnum >= (unsigned int)el->el_map.nfunc) { /* BUG CHECK command */
535 (void) fprintf(el->el_errfile,
536 "ERROR: illegal command from key 0%o\r\n", ch);
537 #endif /* DEBUG_EDIT */
538 continue; /* try again */
540 /* now do the real command */
544 for (b = el->el_map.help; b->name; b++)
545 if (b->func == cmdnum)
548 (void) fprintf(el->el_errfile,
549 "Executing %s\n", b->name);
551 (void) fprintf(el->el_errfile,
552 "Error command = %d\n", cmdnum);
554 #endif /* DEBUG_READ */
555 /* vi redo needs these way down the levels... */
556 el->el_state.thiscmd = cmdnum;
557 el->el_state.thisch = ch;
558 if (el->el_map.type == MAP_VI &&
559 el->el_map.current == el->el_map.key &&
560 el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
561 if (cmdnum == VI_DELETE_PREV_CHAR &&
562 el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
563 && isprint((unsigned char)el->el_chared.c_redo.pos[-1]))
564 el->el_chared.c_redo.pos--;
566 *el->el_chared.c_redo.pos++ = ch;
568 retval = (*el->el_map.func[cmdnum]) (el, ch);
570 (void) fprintf(el->el_errfile,
571 "Returned state %d\n", retval );
572 #endif /* DEBUG_READ */
574 /* save the last command here */
575 el->el_state.lastcmd = cmdnum;
577 /* use any return value */
580 re_refresh_cursor(el);
585 re_clear_display(el);
592 case CC_REFRESH_BEEP:
597 case CC_NORM: /* normal char */
600 case CC_ARGHACK: /* Suggested by Rich Salz */
601 /* <rsalz@pineapple.bbn.com> */
602 continue; /* keep going... */
604 case CC_EOF: /* end of file typed */
605 if ((el->el_flags & UNBUFFERED) == 0)
607 else if (num == -1) {
608 *el->el_line.lastchar++ = CONTROL('d');
609 el->el_line.cursor = el->el_line.lastchar;
614 case CC_NEWLINE: /* normal end of line */
615 num = (int)(el->el_line.lastchar - el->el_line.buffer);
618 case CC_FATAL: /* fatal error, reset to known state */
620 (void) fprintf(el->el_errfile,
621 "*** editor fatal ERROR ***\r\n\n");
622 #endif /* DEBUG_READ */
623 /* put (real) cursor in a known place */
624 re_clear_display(el); /* reset the display stuff */
625 ch_reset(el, 1); /* reset the input pointers */
626 re_refresh(el); /* print the prompt again */
630 default: /* functions we don't know about */
632 (void) fprintf(el->el_errfile,
633 "*** editor ERROR ***\r\n\n");
634 #endif /* DEBUG_READ */
639 el->el_state.argument = 1;
640 el->el_state.doingarg = 0;
641 el->el_chared.c_vcmd.action = NOP;
642 if (el->el_flags & UNBUFFERED)
646 term__flush(el); /* flush any buffered output */
647 /* make sure the tty is set up correctly */
648 if ((el->el_flags & UNBUFFERED) == 0) {
650 *nread = num != -1 ? num : 0;
652 *nread = (int)(el->el_line.lastchar - el->el_line.buffer);
658 errno = el->el_errno;
662 return el->el_line.buffer;