449 lines
11 KiB
C
449 lines
11 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Christos Zoulas of Cornell University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if !defined(lint) && !defined(SCCSID)
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#if 0
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static char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/4/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint && not SCCSID */
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/*
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* read.c: Clean this junk up! This is horrible code.
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* Terminal read functions
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*/
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#include "sys.h"
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "el.h"
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#define OKCMD -1
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private int read__fixio __P((int, int));
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private int read_preread __P((EditLine *));
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private int read_getcmd __P((EditLine *, el_action_t *, char *));
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#ifdef DEBUG_EDIT
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private void
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read_debug(el)
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EditLine *el;
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{
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if (el->el_line.cursor > el->el_line.lastchar)
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(void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
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if (el->el_line.cursor < el->el_line.buffer)
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(void) fprintf(el->el_errfile, "cursor < buffer\r\n");
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if (el->el_line.cursor > el->el_line.limit)
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(void) fprintf(el->el_errfile, "cursor > limit\r\n");
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if (el->el_line.lastchar > el->el_line.limit)
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(void) fprintf(el->el_errfile, "lastchar > limit\r\n");
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if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
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(void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
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}
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#endif /* DEBUG_EDIT */
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/* read__fixio():
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* Try to recover from a read error
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*/
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private int
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read__fixio(fd, e)
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int fd, e;
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{
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switch (e) {
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case -1: /* Make sure that the code is reachable */
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#ifdef EWOULDBLOCK
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case EWOULDBLOCK:
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# ifndef TRY_AGAIN
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# define TRY_AGAIN
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# endif
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#endif /* EWOULDBLOCK */
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#if defined(POSIX) && defined(EAGAIN)
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# if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
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case EAGAIN:
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# ifndef TRY_AGAIN
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# define TRY_AGAIN
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# endif
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# endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
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#endif /* POSIX && EAGAIN */
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e = 0;
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#ifdef TRY_AGAIN
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# if defined(F_SETFL) && defined(O_NDELAY)
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if ((e = fcntl(fd, F_GETFL, 0)) == -1)
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return -1;
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if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
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return -1;
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else
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e = 1;
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# endif /* F_SETFL && O_NDELAY */
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# ifdef FIONBIO
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if (ioctl(fd, FIONBIO, (ioctl_t) &e) == -1)
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return -1;
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else
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e = 1;
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# endif /* FIONBIO */
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#endif /* TRY_AGAIN */
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return e ? 0 : -1;
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case EINTR:
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return 0;
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default:
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return -1;
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}
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}
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/* read_preread():
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* Try to read the stuff in the input queue;
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*/
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private int
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read_preread(el)
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EditLine *el;
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{
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int chrs = 0;
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if (el->el_chared.c_macro.nline) {
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el_free((ptr_t) el->el_chared.c_macro.nline);
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el->el_chared.c_macro.nline = NULL;
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}
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if (el->el_tty.t_mode == ED_IO)
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return 0;
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#ifdef FIONREAD
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(void) ioctl(el->el_infd, FIONREAD, (ioctl_t) &chrs);
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if (chrs > 0) {
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char buf[EL_BUFSIZ];
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chrs = read(el->el_infd, buf, (size_t) MIN(chrs, EL_BUFSIZ - 1));
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if (chrs > 0) {
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buf[chrs] = '\0';
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el->el_chared.c_macro.nline = strdup(buf);
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el_push(el->el_chared.c_macro.nline);
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}
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}
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#endif /* FIONREAD */
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return chrs > 0;
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}
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/* el_push():
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* Push a macro
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*/
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public void
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el_push(el, str)
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EditLine *el;
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const char *str;
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{
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c_macro_t *ma = &el->el_chared.c_macro;
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if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
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ma->level++;
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ma->macro[ma->level] = (char *) str;
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}
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else {
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term_beep(el);
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term__flush();
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}
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}
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/* read_getcmd():
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* Return next command from the input stream.
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*/
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private int
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read_getcmd(el, cmdnum, ch)
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EditLine *el;
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el_action_t *cmdnum;
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char *ch;
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{
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el_action_t cmd = ED_UNASSIGNED;
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int num;
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while (cmd == ED_UNASSIGNED || cmd == ED_SEQUENCE_LEAD_IN) {
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if ((num = el_getc(el, ch)) != 1) /* if EOF or error */
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return num;
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#ifdef KANJI
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if ((*ch & 0200)) {
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el->el_state.metanext = 0;
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cmd = CcViMap[' '];
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break;
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}
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else
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#endif /* KANJI */
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if (el->el_state.metanext) {
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el->el_state.metanext = 0;
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*ch |= 0200;
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}
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cmd = el->el_map.current[(unsigned char) *ch];
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if (cmd == ED_SEQUENCE_LEAD_IN) {
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key_value_t val;
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switch (key_get(el, ch, &val)) {
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case XK_CMD:
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cmd = val.cmd;
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break;
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case XK_STR:
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el_push(el, val.str);
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break;
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#ifdef notyet
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case XK_EXE:
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/* XXX: In the future to run a user function */
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RunCommand(val.str);
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break;
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#endif
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default:
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abort();
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break;
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}
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}
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if (el->el_map.alt == NULL)
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el->el_map.current = el->el_map.key;
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}
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*cmdnum = cmd;
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return OKCMD;
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}
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/* el_getc():
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* Read a character
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*/
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public int
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el_getc(el, cp)
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EditLine *el;
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char *cp;
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{
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int num_read;
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unsigned char tcp;
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int tried = 0;
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c_macro_t *ma = &el->el_chared.c_macro;
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term__flush();
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for (;;) {
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if (ma->level < 0) {
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if (!read_preread(el))
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break;
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}
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if (ma->level < 0)
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break;
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if (*ma->macro[ma->level] == 0) {
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ma->level--;
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continue;
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}
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*cp = *ma->macro[ma->level]++ & 0377;
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if (*ma->macro[ma->level] == 0) { /* Needed for QuoteMode On */
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ma->level--;
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}
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return 1;
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}
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#ifdef DEBUG_READ
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(void) fprintf(el->el_errfile, "Turning raw mode on\n");
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#endif /* DEBUG_READ */
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if (tty_rawmode(el) < 0) /* make sure the tty is set up correctly */
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return 0;
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#ifdef DEBUG_READ
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(void) fprintf(el->el_errfile, "Reading a character\n");
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#endif /* DEBUG_READ */
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while ((num_read = read(el->el_infd, (char *) &tcp, 1)) == -1)
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if (!tried && read__fixio(el->el_infd, errno) == 0)
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tried = 1;
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else {
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*cp = '\0';
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return -1;
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}
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#ifdef DEBUG_READ
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(void) fprintf(el->el_errfile, "Got it %c\n", tcp);
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#endif /* DEBUG_READ */
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*cp = tcp;
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return num_read;
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}
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public const char *
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el_gets(el, nread)
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EditLine *el;
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int *nread;
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{
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int retval;
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el_action_t cmdnum = 0;
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int num; /* how many chars we have read at NL */
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char ch;
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if (el->el_flags & HANDLE_SIGNALS)
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sig_set(el);
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re_clear_display(el); /* reset the display stuff */
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ch_reset(el);
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#ifdef FIONREAD
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if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
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long chrs = 0;
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(void) ioctl(el->el_infd, FIONREAD, (ioctl_t) &chrs);
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if (chrs == 0) {
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if (tty_rawmode(el) < 0) {
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if (nread)
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*nread = 0;
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return NULL;
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}
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}
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}
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#endif /* FIONREAD */
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re_refresh(el); /* print the prompt */
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for (num = OKCMD; num == OKCMD;) { /* while still editing this line */
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#ifdef DEBUG_EDIT
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read_debug(el);
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#endif /* DEBUG_EDIT */
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/* if EOF or error */
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if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
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#ifdef DEBUG_READ
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(void) fprintf(el->el_errfile, "Returning from el_gets %d\n", num);
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#endif /* DEBUG_READ */
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break;
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}
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if (cmdnum >= el->el_map.nfunc) { /* BUG CHECK command */
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#ifdef DEBUG_EDIT
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(void) fprintf(el->el_errfile,
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"ERROR: illegal command from key 0%o\r\n", ch);
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#endif /* DEBUG_EDIT */
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continue; /* try again */
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}
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/* now do the real command */
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#ifdef DEBUG_READ
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{
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el_bindings_t *b;
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for (b = el->el_map.help; b->name; b++)
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if (b->func == cmdnum)
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break;
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if (b->name)
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(void) fprintf(el->el_errfile, "Executing %s\n", b->name);
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else
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(void) fprintf(el->el_errfile, "Error command = %d\n", cmdnum);
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}
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#endif /* DEBUG_READ */
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retval = (*el->el_map.func[cmdnum])(el, ch);
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/* save the last command here */
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el->el_state.lastcmd = cmdnum;
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/* use any return value */
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switch (retval) {
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case CC_CURSOR:
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el->el_state.argument = 1;
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el->el_state.doingarg = 0;
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re_refresh_cursor(el);
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break;
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case CC_REDISPLAY:
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re_clear_lines(el);
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re_clear_display(el);
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/* FALLTHROUGH */
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case CC_REFRESH:
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el->el_state.argument = 1;
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el->el_state.doingarg = 0;
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re_refresh(el);
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break;
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case CC_NORM: /* normal char */
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el->el_state.argument = 1;
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el->el_state.doingarg = 0;
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break;
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case CC_ARGHACK: /* Suggested by Rich Salz */
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/* <rsalz@pineapple.bbn.com> */
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break; /* keep going... */
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case CC_EOF: /* end of file typed */
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num = 0;
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break;
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case CC_NEWLINE: /* normal end of line */
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num = el->el_line.lastchar - el->el_line.buffer;
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break;
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case CC_FATAL: /* fatal error, reset to known state */
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#ifdef DEBUG_READ
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(void) fprintf(el->el_errfile, "*** editor fatal ERROR ***\r\n\n");
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#endif /* DEBUG_READ */
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/* put (real) cursor in a known place */
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re_clear_display(el); /* reset the display stuff */
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ch_reset(el); /* reset the input pointers */
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re_refresh(el); /* print the prompt again */
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el->el_state.argument = 1;
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el->el_state.doingarg = 0;
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break;
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case CC_ERROR:
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default: /* functions we don't know about */
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#ifdef DEBUG_READ
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(void) fprintf(el->el_errfile, "*** editor ERROR ***\r\n\n");
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#endif /* DEBUG_READ */
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el->el_state.argument = 1;
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el->el_state.doingarg = 0;
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term_beep(el);
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term__flush();
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break;
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}
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}
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term__flush(); /* flush any buffered output */
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(void) tty_cookedmode(el); /* make sure the tty is set up correctly */
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if (el->el_flags & HANDLE_SIGNALS)
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sig_clr(el);
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if (nread)
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*nread = num;
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return num ? el->el_line.buffer : NULL;
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}
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