1 /* $NetBSD: read.c,v 1.106 2019/07/23 10:18:52 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 1.106 2019/07/23 10:18:52 christos Exp $");
42 #endif /* not lint && not SCCSID */
45 * read.c: Terminal read functions
59 #define EL_MAXMACRO 10
69 el_rfunc_t read_char; /* Function to read a character. */
73 static int read__fixio(int, int);
74 static int read_char(EditLine *, wchar_t *);
75 static int read_getcmd(EditLine *, el_action_t *, wchar_t *);
76 static void read_clearmacros(struct macros *);
77 static void read_pop(struct macros *);
78 static const wchar_t *noedit_wgets(EditLine *, int *);
81 * Initialize the read stuff
84 read_init(EditLine *el)
88 if ((el->el_read = el_malloc(sizeof(*el->el_read))) == NULL)
91 ma = &el->el_read->macros;
92 if ((ma->macro = el_calloc(EL_MAXMACRO, sizeof(*ma->macro))) == NULL) {
99 /* builtin read_char */
100 el->el_read->read_char = read_char;
105 * Free the data structures used by the read stuff.
108 read_end(struct el_read_t *el_read)
110 read_clearmacros(&el_read->macros);
111 el_free(el_read->macros.macro);
112 el_read->macros.macro = NULL;
117 * Set the read char function to the one provided.
118 * If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
121 el_read_setfn(struct el_read_t *el_read, el_rfunc_t rc)
123 el_read->read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
129 * return the current read char function, or EL_BUILTIN_GETCFN
130 * if it is the default one
132 libedit_private el_rfunc_t
133 el_read_getfn(struct el_read_t *el_read)
135 return el_read->read_char == read_char ?
136 EL_BUILTIN_GETCFN : el_read->read_char;
141 * Try to recover from a read error
145 read__fixio(int fd __attribute__((__unused__)), int e)
149 case -1: /* Make sure that the code is reachable */
156 #endif /* EWOULDBLOCK */
158 #if defined(POSIX) && defined(EAGAIN)
159 #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
164 #endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
165 #endif /* POSIX && EAGAIN */
169 #if defined(F_SETFL) && defined(O_NDELAY)
170 if ((e = fcntl(fd, F_GETFL, 0)) == -1)
173 if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
177 #endif /* F_SETFL && O_NDELAY */
183 if (ioctl(fd, FIONBIO, &zero) == -1)
190 #endif /* TRY_AGAIN */
206 el_wpush(EditLine *el, const wchar_t *str)
208 struct macros *ma = &el->el_read->macros;
210 if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
212 if ((ma->macro[ma->level] = wcsdup(str)) != NULL)
222 * Get next command from the input stream,
223 * return 0 on success or -1 on EOF or error.
224 * Character values > 255 are not looked up in the map, but inserted.
227 read_getcmd(EditLine *el, el_action_t *cmdnum, wchar_t *ch)
229 static const wchar_t meta = (wchar_t)0x80;
233 if (el_wgetc(el, ch) != 1)
238 el->el_state.metanext = 0;
244 if (el->el_state.metanext) {
245 el->el_state.metanext = 0;
251 cmd = el->el_map.current[(unsigned char) *ch];
252 if (cmd == ED_SEQUENCE_LEAD_IN) {
253 keymacro_value_t val;
254 switch (keymacro_get(el, ch, &val)) {
259 el_wpush(el, val.str);
264 EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
268 } while (cmd == ED_SEQUENCE_LEAD_IN);
274 * Read a character from the tty.
277 read_char(EditLine *el, wchar_t *cp)
281 char cbuf[MB_LEN_MAX];
283 int save_errno = errno;
286 el->el_signal->sig_no = 0;
287 while ((num_read = read(el->el_infd, cbuf + cbp, (size_t)1)) == -1) {
289 switch (el->el_signal->sig_no) {
291 el_wset(el, EL_REFRESH);
299 if (!tried && read__fixio(el->el_infd, e) == 0) {
319 /* This only works because UTF8 is stateless. */
320 memset(&mbs, 0, sizeof(mbs));
321 switch (mbrtowc(cp, cbuf, cbp, &mbs)) {
325 * Invalid sequence, discard all bytes
326 * except the last one.
328 cbuf[0] = cbuf[cbp - 1];
332 /* Invalid byte, discard it. */
337 if (cbp >= MB_LEN_MAX) {
342 /* Incomplete sequence, read another byte. */
345 /* Valid character, process it. */
352 * Pop a macro from the stack
355 read_pop(struct macros *ma)
359 el_free(ma->macro[0]);
360 for (i = 0; i < ma->level; i++)
361 ma->macro[i] = ma->macro[i + 1];
367 read_clearmacros(struct macros *ma)
369 while (ma->level >= 0)
370 el_free(ma->macro[ma->level--]);
375 * Read a wide character
378 el_wgetc(EditLine *el, wchar_t *cp)
380 struct macros *ma = &el->el_read->macros;
388 if (ma->macro[0][ma->offset] == '\0') {
393 *cp = ma->macro[0][ma->offset++];
395 if (ma->macro[0][ma->offset] == '\0') {
396 /* Needed for QuoteMode On */
403 if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
406 num_read = (*el->el_read->read_char)(el, cp);
409 * Remember the original reason of a read failure
410 * such that el_wgets() can restore it after doing
411 * various cleanup operation that might change errno.
414 el->el_read->read_errno = errno;
420 read_prepare(EditLine *el)
422 if (el->el_flags & HANDLE_SIGNALS)
424 if (el->el_flags & NO_TTY)
426 if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
429 /* This is relatively cheap, and things go terribly wrong if
430 we have the wrong size. */
432 re_clear_display(el); /* reset the display stuff */
434 re_refresh(el); /* print the prompt */
436 if (el->el_flags & UNBUFFERED)
441 read_finish(EditLine *el)
443 if ((el->el_flags & UNBUFFERED) == 0)
444 (void) tty_cookedmode(el);
445 if (el->el_flags & HANDLE_SIGNALS)
449 static const wchar_t *
450 noedit_wgets(EditLine *el, int *nread)
452 el_line_t *lp = &el->el_line;
455 while ((num = (*el->el_read->read_char)(el, lp->lastchar)) == 1) {
456 if (lp->lastchar + 1 >= lp->limit &&
457 !ch_enlargebufs(el, (size_t)2))
460 if (el->el_flags & UNBUFFERED ||
461 lp->lastchar[-1] == '\r' ||
462 lp->lastchar[-1] == '\n')
465 if (num == -1 && errno == EINTR)
466 lp->lastchar = lp->buffer;
467 lp->cursor = lp->lastchar;
468 *lp->lastchar = '\0';
469 *nread = (int)(lp->lastchar - lp->buffer);
470 return *nread ? lp->buffer : NULL;
474 el_wgets(EditLine *el, int *nread)
477 el_action_t cmdnum = 0;
478 int num; /* how many chars we have read at NL */
485 el->el_read->read_errno = 0;
487 if (el->el_flags & NO_TTY) {
488 el->el_line.lastchar = el->el_line.buffer;
489 return noedit_wgets(el, nread);
493 if (el->el_tty.t_mode == EX_IO && el->el_read->macros.level < 0) {
496 (void) ioctl(el->el_infd, FIONREAD, &chrs);
498 if (tty_rawmode(el) < 0) {
505 #endif /* FIONREAD */
507 if ((el->el_flags & UNBUFFERED) == 0)
510 if (el->el_flags & EDIT_DISABLED) {
511 if ((el->el_flags & UNBUFFERED) == 0)
512 el->el_line.lastchar = el->el_line.buffer;
514 return noedit_wgets(el, nread);
517 for (num = -1; num == -1;) { /* while still editing this line */
518 /* if EOF or error */
519 if (read_getcmd(el, &cmdnum, &ch) == -1)
521 if ((size_t)cmdnum >= el->el_map.nfunc) /* BUG CHECK command */
522 continue; /* try again */
523 /* now do the real command */
524 /* vi redo needs these way down the levels... */
525 el->el_state.thiscmd = cmdnum;
526 el->el_state.thisch = ch;
527 if (el->el_map.type == MAP_VI &&
528 el->el_map.current == el->el_map.key &&
529 el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
530 if (cmdnum == VI_DELETE_PREV_CHAR &&
531 el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
532 && iswprint(el->el_chared.c_redo.pos[-1]))
533 el->el_chared.c_redo.pos--;
535 *el->el_chared.c_redo.pos++ = ch;
537 retval = (*el->el_map.func[cmdnum]) (el, ch);
539 /* save the last command here */
540 el->el_state.lastcmd = cmdnum;
542 /* use any return value */
545 re_refresh_cursor(el);
550 re_clear_display(el);
557 case CC_REFRESH_BEEP:
562 case CC_NORM: /* normal char */
565 case CC_ARGHACK: /* Suggested by Rich Salz */
566 /* <rsalz@pineapple.bbn.com> */
567 continue; /* keep going... */
569 case CC_EOF: /* end of file typed */
570 if ((el->el_flags & UNBUFFERED) == 0)
572 else if (num == -1) {
573 *el->el_line.lastchar++ = CONTROL('d');
574 el->el_line.cursor = el->el_line.lastchar;
579 case CC_NEWLINE: /* normal end of line */
580 num = (int)(el->el_line.lastchar - el->el_line.buffer);
583 case CC_FATAL: /* fatal error, reset to known state */
584 /* put (real) cursor in a known place */
585 re_clear_display(el); /* reset the display stuff */
586 ch_reset(el); /* reset the input pointers */
587 read_clearmacros(&el->el_read->macros);
588 re_refresh(el); /* print the prompt again */
592 default: /* functions we don't know about */
597 el->el_state.argument = 1;
598 el->el_state.doingarg = 0;
599 el->el_chared.c_vcmd.action = NOP;
600 if (el->el_flags & UNBUFFERED)
604 terminal__flush(el); /* flush any buffered output */
605 /* make sure the tty is set up correctly */
606 if ((el->el_flags & UNBUFFERED) == 0) {
608 *nread = num != -1 ? num : 0;
610 *nread = (int)(el->el_line.lastchar - el->el_line.buffer);
615 if (el->el_read->read_errno)
616 errno = el->el_read->read_errno;
620 return el->el_line.buffer;