2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Christos Zoulas of Cornell University.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $NetBSD: read.c,v 1.52 2009/07/22 15:57:00 christos Exp $
35 #if !defined(lint) && !defined(SCCSID)
36 static char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/4/93";
37 #endif /* not lint && not SCCSID */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
42 * read.c: Clean this junk up! This is horrible code.
43 * Terminal read functions
54 private int read__fixio(int, int);
55 private int read_preread(EditLine *);
56 private int read_char(EditLine *, char *);
57 private int read_getcmd(EditLine *, el_action_t *, char *);
58 private void read_pop(c_macro_t *);
61 * Initialize the read stuff
64 read_init(EditLine *el)
66 /* builtin read_char */
67 el->el_read.read_char = read_char;
73 * Set the read char function to the one provided.
74 * If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
77 el_read_setfn(EditLine *el, el_rfunc_t rc)
79 el->el_read.read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
85 * return the current read char function, or EL_BUILTIN_GETCFN
86 * if it is the default one
89 el_read_getfn(EditLine *el)
91 return (el->el_read.read_char == read_char) ?
92 EL_BUILTIN_GETCFN : el->el_read.read_char;
97 #define MIN(A,B) ((A) < (B) ? (A) : (B))
102 read_debug(EditLine *el)
105 if (el->el_line.cursor > el->el_line.lastchar)
106 (void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
107 if (el->el_line.cursor < el->el_line.buffer)
108 (void) fprintf(el->el_errfile, "cursor < buffer\r\n");
109 if (el->el_line.cursor > el->el_line.limit)
110 (void) fprintf(el->el_errfile, "cursor > limit\r\n");
111 if (el->el_line.lastchar > el->el_line.limit)
112 (void) fprintf(el->el_errfile, "lastchar > limit\r\n");
113 if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
114 (void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
116 #endif /* DEBUG_EDIT */
120 * Try to recover from a read error
124 read__fixio(int fd __unused, int e)
128 case -1: /* Make sure that the code is reachable */
135 #endif /* EWOULDBLOCK */
137 #if defined(POSIX) && defined(EAGAIN)
138 #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
143 #endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
144 #endif /* POSIX && EAGAIN */
148 #if defined(F_SETFL) && defined(O_NDELAY)
149 if ((e = fcntl(fd, F_GETFL, 0)) == -1)
152 if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
156 #endif /* F_SETFL && O_NDELAY */
162 if (ioctl(fd, FIONBIO, (ioctl_t) & zero) == -1)
169 #endif /* TRY_AGAIN */
182 * Try to read the stuff in the input queue;
185 read_preread(EditLine *el)
189 if (el->el_tty.t_mode == ED_IO)
193 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
197 chrs = read(el->el_infd, buf,
198 (size_t) MIN(chrs, EL_BUFSIZ - 1));
204 #endif /* FIONREAD */
214 el_push(EditLine *el, const char *str)
216 c_macro_t *ma = &el->el_chared.c_macro;
218 if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
220 if ((ma->macro[ma->level] = el_strdup(str)) != NULL)
230 * Return next command from the input stream.
233 read_getcmd(EditLine *el, el_action_t *cmdnum, char *ch)
240 if ((num = el_getc(el, ch)) != 1) { /* if EOF or error */
241 el->el_errno = num == 0 ? 0 : errno;
247 el->el_state.metanext = 0;
253 if (el->el_state.metanext) {
254 el->el_state.metanext = 0;
257 cmd = el->el_map.current[(unsigned char) *ch];
258 if (cmd == ED_SEQUENCE_LEAD_IN) {
260 switch (key_get(el, ch, &val)) {
265 el_push(el, val.str);
269 /* XXX: In the future to run a user function */
274 EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
278 if (el->el_map.alt == NULL)
279 el->el_map.current = el->el_map.key;
280 } while (cmd == ED_SEQUENCE_LEAD_IN);
287 * Read a character from the tty.
290 read_char(EditLine *el, char *cp)
296 el->el_signal->sig_no = 0;
297 while ((num_read = read(el->el_infd, cp, 1)) == -1) {
298 if (el->el_signal->sig_no == SIGCONT) {
300 el_set(el, EL_REFRESH);
303 if (!tried && read__fixio(el->el_infd, errno) == 0)
310 return (int)num_read;
314 * Pop a macro from the stack
317 read_pop(c_macro_t *ma)
321 el_free(ma->macro[0]);
322 for (i = 0; i < ma->level; i++)
323 ma->macro[i] = ma->macro[i + 1];
332 el_getc(EditLine *el, char *cp)
335 c_macro_t *ma = &el->el_chared.c_macro;
340 if (!read_preread(el))
347 if (ma->macro[0][ma->offset] == '\0') {
352 *cp = ma->macro[0][ma->offset++] & 0377;
354 if (ma->macro[0][ma->offset] == '\0') {
355 /* Needed for QuoteMode On */
363 (void) fprintf(el->el_errfile, "Turning raw mode on\n");
364 #endif /* DEBUG_READ */
365 if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
369 (void) fprintf(el->el_errfile, "Reading a character\n");
370 #endif /* DEBUG_READ */
371 num_read = (*el->el_read.read_char)(el, cp);
373 (void) fprintf(el->el_errfile, "Got it %c\n", *cp);
374 #endif /* DEBUG_READ */
379 read_prepare(EditLine *el)
381 if (el->el_flags & HANDLE_SIGNALS)
383 if (el->el_flags & NO_TTY)
385 if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
388 /* This is relatively cheap, and things go terribly wrong if
389 we have the wrong size. */
391 re_clear_display(el); /* reset the display stuff */
393 re_refresh(el); /* print the prompt */
395 if (el->el_flags & UNBUFFERED)
400 read_finish(EditLine *el)
402 if ((el->el_flags & UNBUFFERED) == 0)
403 (void) tty_cookedmode(el);
404 if (el->el_flags & HANDLE_SIGNALS)
409 el_gets(EditLine *el, int *nread)
412 el_action_t cmdnum = 0;
413 int num; /* how many chars we have read at NL */
418 c_macro_t *ma = &el->el_chared.c_macro;
419 #endif /* FIONREAD */
425 if (el->el_flags & NO_TTY) {
426 char *cp = el->el_line.buffer;
429 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
430 /* make sure there is space for next character */
431 if (cp + 1 >= el->el_line.limit) {
432 idx = (cp - el->el_line.buffer);
433 if (!ch_enlargebufs(el, 2))
435 cp = &el->el_line.buffer[idx];
438 if (el->el_flags & UNBUFFERED)
440 if (cp[-1] == '\r' || cp[-1] == '\n')
444 el->el_errno = errno;
446 el->el_line.cursor = el->el_line.lastchar = cp;
448 *nread = (int)(el->el_line.cursor - el->el_line.buffer);
454 if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
457 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
459 if (tty_rawmode(el) < 0) {
466 #endif /* FIONREAD */
468 if ((el->el_flags & UNBUFFERED) == 0)
471 if (el->el_flags & EDIT_DISABLED) {
475 if ((el->el_flags & UNBUFFERED) == 0)
476 cp = el->el_line.buffer;
478 cp = el->el_line.lastchar;
482 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
483 /* make sure there is space next character */
484 if (cp + 1 >= el->el_line.limit) {
485 idx = (cp - el->el_line.buffer);
486 if (!ch_enlargebufs(el, 2))
488 cp = &el->el_line.buffer[idx];
491 crlf = cp[-1] == '\r' || cp[-1] == '\n';
492 if (el->el_flags & UNBUFFERED)
499 el->el_errno = errno;
502 el->el_line.cursor = el->el_line.lastchar = cp;
507 for (num = OKCMD; num == OKCMD;) { /* while still editing this
511 #endif /* DEBUG_EDIT */
512 /* if EOF or error */
513 if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
515 (void) fprintf(el->el_errfile,
516 "Returning from el_gets %d\n", num);
517 #endif /* DEBUG_READ */
520 if ((unsigned int)cmdnum >= (unsigned int)el->el_map.nfunc) { /* BUG CHECK command */
522 (void) fprintf(el->el_errfile,
523 "ERROR: illegal command from key 0%o\r\n", ch);
524 #endif /* DEBUG_EDIT */
525 continue; /* try again */
527 /* now do the real command */
531 for (b = el->el_map.help; b->name; b++)
532 if (b->func == cmdnum)
535 (void) fprintf(el->el_errfile,
536 "Executing %s\n", b->name);
538 (void) fprintf(el->el_errfile,
539 "Error command = %d\n", cmdnum);
541 #endif /* DEBUG_READ */
542 /* vi redo needs these way down the levels... */
543 el->el_state.thiscmd = cmdnum;
544 el->el_state.thisch = ch;
545 if (el->el_map.type == MAP_VI &&
546 el->el_map.current == el->el_map.key &&
547 el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
548 if (cmdnum == VI_DELETE_PREV_CHAR &&
549 el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
550 && isprint((unsigned char)el->el_chared.c_redo.pos[-1]))
551 el->el_chared.c_redo.pos--;
553 *el->el_chared.c_redo.pos++ = ch;
555 retval = (*el->el_map.func[cmdnum]) (el, ch);
557 (void) fprintf(el->el_errfile,
558 "Returned state %d\n", retval );
559 #endif /* DEBUG_READ */
561 /* save the last command here */
562 el->el_state.lastcmd = cmdnum;
564 /* use any return value */
567 re_refresh_cursor(el);
572 re_clear_display(el);
579 case CC_REFRESH_BEEP:
584 case CC_NORM: /* normal char */
587 case CC_ARGHACK: /* Suggested by Rich Salz */
588 /* <rsalz@pineapple.bbn.com> */
589 continue; /* keep going... */
591 case CC_EOF: /* end of file typed */
592 if ((el->el_flags & UNBUFFERED) == 0)
594 else if (num == -1) {
595 *el->el_line.lastchar++ = CONTROL('d');
596 el->el_line.cursor = el->el_line.lastchar;
601 case CC_NEWLINE: /* normal end of line */
602 num = (int)(el->el_line.lastchar - el->el_line.buffer);
605 case CC_FATAL: /* fatal error, reset to known state */
607 (void) fprintf(el->el_errfile,
608 "*** editor fatal ERROR ***\r\n\n");
609 #endif /* DEBUG_READ */
610 /* put (real) cursor in a known place */
611 re_clear_display(el); /* reset the display stuff */
612 ch_reset(el, 1); /* reset the input pointers */
613 re_refresh(el); /* print the prompt again */
617 default: /* functions we don't know about */
619 (void) fprintf(el->el_errfile,
620 "*** editor ERROR ***\r\n\n");
621 #endif /* DEBUG_READ */
626 el->el_state.argument = 1;
627 el->el_state.doingarg = 0;
628 el->el_chared.c_vcmd.action = NOP;
629 if (el->el_flags & UNBUFFERED)
633 term__flush(el); /* flush any buffered output */
634 /* make sure the tty is set up correctly */
635 if ((el->el_flags & UNBUFFERED) == 0) {
637 *nread = num != -1 ? num : 0;
639 *nread = (int)(el->el_line.lastchar - el->el_line.buffer);
645 errno = el->el_errno;
649 return el->el_line.buffer;