581 lines
13 KiB
C
581 lines
13 KiB
C
/* $OpenBSD: read.c,v 1.49 2021/08/13 10:21:25 schwarze Exp $ */
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/* $NetBSD: read.c,v 1.100 2016/05/24 19:31:27 christos Exp $ */
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/*-
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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. 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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#include "config.h"
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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/ioctl.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "el.h"
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#include "fcns.h"
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#include "read.h"
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#define EL_MAXMACRO 10
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struct macros {
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wchar_t **macro;
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int level;
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int offset;
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};
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struct el_read_t {
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struct macros macros;
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el_rfunc_t read_char; /* Function to read a character. */
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int read_errno;
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};
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static int read_char(EditLine *, wchar_t *);
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static int read_getcmd(EditLine *, el_action_t *, wchar_t *);
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static void read_clearmacros(struct macros *);
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static void read_pop(struct macros *);
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/* read_init():
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* Initialize the read stuff
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*/
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protected int
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read_init(EditLine *el)
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{
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struct macros *ma;
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if ((el->el_read = malloc(sizeof(*el->el_read))) == NULL)
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return -1;
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ma = &el->el_read->macros;
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if ((ma->macro = reallocarray(NULL, EL_MAXMACRO,
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sizeof(*ma->macro))) == NULL) {
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free(el->el_read);
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return -1;
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}
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ma->level = -1;
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ma->offset = 0;
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/* builtin read_char */
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el->el_read->read_char = read_char;
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return 0;
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}
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/* el_read_end():
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* Free the data structures used by the read stuff.
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*/
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protected void
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read_end(struct el_read_t *el_read)
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{
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read_clearmacros(&el_read->macros);
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free(el_read->macros.macro);
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el_read->macros.macro = NULL;
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}
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/* el_read_setfn():
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* Set the read char function to the one provided.
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* If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
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*/
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protected int
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el_read_setfn(struct el_read_t *el_read, el_rfunc_t rc)
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{
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el_read->read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
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return 0;
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}
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/* el_read_getfn():
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* return the current read char function, or EL_BUILTIN_GETCFN
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* if it is the default one
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*/
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protected el_rfunc_t
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el_read_getfn(struct el_read_t *el_read)
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{
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return el_read->read_char == read_char ?
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EL_BUILTIN_GETCFN : el_read->read_char;
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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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void
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el_wpush(EditLine *el, const wchar_t *str)
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{
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struct macros *ma = &el->el_read->macros;
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if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
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ma->level++;
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if ((ma->macro[ma->level] = wcsdup(str)) != NULL)
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return;
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ma->level--;
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}
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terminal_beep(el);
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terminal__flush(el);
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}
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/* read_getcmd():
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* Get next command from the input stream,
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* return 0 on success or -1 on EOF or error.
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* Character values > 255 are not looked up in the map, but inserted.
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*/
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static int
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read_getcmd(EditLine *el, el_action_t *cmdnum, wchar_t *ch)
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{
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static const wchar_t meta = (wchar_t)0x80;
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el_action_t cmd;
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int num;
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do {
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if ((num = el_wgetc(el, ch)) != 1)
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return -1;
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#ifdef KANJI
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if ((*ch & meta)) {
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el->el_state.metanext = 0;
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cmd = CcViMap[' '];
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break;
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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 |= meta;
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}
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if (*ch >= N_KEYS)
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cmd = ED_INSERT;
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else
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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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keymacro_value_t val;
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switch (keymacro_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_wpush(el, val.str);
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break;
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case XK_NOD:
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return -1;
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default:
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EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
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break;
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}
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}
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} while (cmd == ED_SEQUENCE_LEAD_IN);
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*cmdnum = cmd;
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return 0;
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}
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/* read_char():
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* Read a character from the tty.
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*/
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static int
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read_char(EditLine *el, wchar_t *cp)
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{
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char cbuf[MB_LEN_MAX];
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int cbp = 0;
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again:
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el->el_signal->sig_no = 0;
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switch (read(el->el_infd, cbuf + cbp, 1)) {
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case -1:
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if (errno == EINTR) {
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switch (el->el_signal->sig_no) {
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case SIGCONT:
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el_set(el, EL_REFRESH);
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/*FALLTHROUGH*/
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case SIGWINCH:
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sig_set(el);
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goto again;
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default:
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break;
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}
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}
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*cp = L'\0';
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return -1;
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case 0:
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*cp = L'\0';
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return 0;
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default:
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break;
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}
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for (;;) {
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mbstate_t mbs;
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++cbp;
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/* This only works because UTF8 is stateless. */
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memset(&mbs, 0, sizeof(mbs));
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switch (mbrtowc(cp, cbuf, cbp, &mbs)) {
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case (size_t)-1:
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if (cbp > 1) {
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/*
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* Invalid sequence, discard all bytes
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* except the last one.
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*/
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cbuf[0] = cbuf[cbp - 1];
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cbp = 0;
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break;
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} else {
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/* Invalid byte, discard it. */
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cbp = 0;
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goto again;
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}
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case (size_t)-2:
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/*
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* We don't support other multibyte charsets.
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* The second condition shouldn't happen
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* and is here merely for additional safety.
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*/
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if ((el->el_flags & CHARSET_IS_UTF8) == 0 ||
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cbp >= MB_LEN_MAX) {
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errno = EILSEQ;
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*cp = L'\0';
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return -1;
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}
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/* Incomplete sequence, read another byte. */
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goto again;
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default:
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/* Valid character, process it. */
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return 1;
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}
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}
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}
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/* read_pop():
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* Pop a macro from the stack
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*/
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static void
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read_pop(struct macros *ma)
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{
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int i;
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free(ma->macro[0]);
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for (i = 0; i < ma->level; i++)
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ma->macro[i] = ma->macro[i + 1];
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ma->level--;
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ma->offset = 0;
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}
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static void
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read_clearmacros(struct macros *ma)
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{
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while (ma->level >= 0)
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free(ma->macro[ma->level--]);
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ma->offset = 0;
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}
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/* el_wgetc():
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* Read a wide character
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*/
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int
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el_wgetc(EditLine *el, wchar_t *cp)
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{
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struct macros *ma = &el->el_read->macros;
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int num_read;
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terminal__flush(el);
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for (;;) {
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if (ma->level < 0)
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break;
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if (ma->macro[0][ma->offset] == '\0') {
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read_pop(ma);
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continue;
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}
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*cp = ma->macro[0][ma->offset++];
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if (ma->macro[0][ma->offset] == '\0') {
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/* Needed for QuoteMode On */
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read_pop(ma);
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}
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return 1;
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}
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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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num_read = (*el->el_read->read_char)(el, cp);
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/*
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* Remember the original reason of a read failure
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* such that el_wgets() can restore it after doing
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* various cleanup operation that might change errno.
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*/
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if (num_read < 0)
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el->el_read->read_errno = errno;
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return num_read;
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}
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protected void
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read_prepare(EditLine *el)
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{
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if (el->el_flags & HANDLE_SIGNALS)
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sig_set(el);
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if (el->el_flags & NO_TTY)
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return;
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if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
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tty_rawmode(el);
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/* This is relatively cheap, and things go terribly wrong if
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we have the wrong size. */
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el_resize(el);
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re_clear_display(el); /* reset the display stuff */
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ch_reset(el);
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re_refresh(el); /* print the prompt */
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if (el->el_flags & UNBUFFERED)
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terminal__flush(el);
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}
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protected void
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read_finish(EditLine *el)
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{
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if ((el->el_flags & UNBUFFERED) == 0)
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(void) tty_cookedmode(el);
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if (el->el_flags & HANDLE_SIGNALS)
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sig_clr(el);
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}
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const wchar_t *
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el_wgets(EditLine *el, 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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wchar_t wc;
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wchar_t ch, *cp;
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int crlf = 0;
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int nrb;
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if (nread == NULL)
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nread = &nrb;
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*nread = 0;
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el->el_read->read_errno = 0;
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if (el->el_flags & NO_TTY) {
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size_t idx;
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cp = el->el_line.buffer;
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while ((num = (*el->el_read->read_char)(el, &wc)) == 1) {
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*cp = wc;
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/* make sure there is space for next character */
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if (cp + 1 >= el->el_line.limit) {
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idx = (cp - el->el_line.buffer);
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if (!ch_enlargebufs(el, 2))
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break;
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cp = &el->el_line.buffer[idx];
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}
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cp++;
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if (el->el_flags & UNBUFFERED)
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break;
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if (cp[-1] == '\r' || cp[-1] == '\n')
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break;
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}
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if (num == -1 && errno == EINTR)
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cp = el->el_line.buffer;
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goto noedit;
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}
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#ifdef FIONREAD
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if (el->el_tty.t_mode == EX_IO && el->el_read->macros.level < 0) {
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int chrs = 0;
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(void) ioctl(el->el_infd, FIONREAD, &chrs);
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if (chrs == 0) {
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if (tty_rawmode(el) < 0) {
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errno = 0;
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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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if ((el->el_flags & UNBUFFERED) == 0)
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read_prepare(el);
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if (el->el_flags & EDIT_DISABLED) {
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size_t idx;
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if ((el->el_flags & UNBUFFERED) == 0)
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cp = el->el_line.buffer;
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else
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cp = el->el_line.lastchar;
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terminal__flush(el);
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while ((num = (*el->el_read->read_char)(el, &wc)) == 1) {
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*cp = wc;
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/* make sure there is space next character */
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if (cp + 1 >= el->el_line.limit) {
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idx = (cp - el->el_line.buffer);
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if (!ch_enlargebufs(el, 2))
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break;
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cp = &el->el_line.buffer[idx];
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}
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cp++;
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crlf = cp[-1] == '\r' || cp[-1] == '\n';
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if (el->el_flags & UNBUFFERED)
|
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break;
|
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if (crlf)
|
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break;
|
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}
|
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if (num == -1 && errno == EINTR)
|
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cp = el->el_line.buffer;
|
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goto noedit;
|
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}
|
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|
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for (num = -1; num == -1;) { /* while still editing this line */
|
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/* if EOF or error */
|
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if (read_getcmd(el, &cmdnum, &ch) == -1)
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break;
|
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if ((int)cmdnum >= el->el_map.nfunc) /* BUG CHECK command */
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continue; /* try again */
|
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/* now do the real command */
|
|
/* vi redo needs these way down the levels... */
|
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el->el_state.thiscmd = cmdnum;
|
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el->el_state.thisch = ch;
|
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if (el->el_map.type == MAP_VI &&
|
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el->el_map.current == el->el_map.key &&
|
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el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
|
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if (cmdnum == VI_DELETE_PREV_CHAR &&
|
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el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
|
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&& iswprint(el->el_chared.c_redo.pos[-1]))
|
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el->el_chared.c_redo.pos--;
|
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else
|
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*el->el_chared.c_redo.pos++ = ch;
|
|
}
|
|
retval = (*el->el_map.func[cmdnum]) (el, ch);
|
|
|
|
/* save the last command here */
|
|
el->el_state.lastcmd = cmdnum;
|
|
|
|
/* use any return value */
|
|
switch (retval) {
|
|
case CC_CURSOR:
|
|
re_refresh_cursor(el);
|
|
break;
|
|
|
|
case CC_REDISPLAY:
|
|
re_clear_lines(el);
|
|
re_clear_display(el);
|
|
/* FALLTHROUGH */
|
|
|
|
case CC_REFRESH:
|
|
re_refresh(el);
|
|
break;
|
|
|
|
case CC_REFRESH_BEEP:
|
|
re_refresh(el);
|
|
terminal_beep(el);
|
|
break;
|
|
|
|
case CC_NORM: /* normal char */
|
|
break;
|
|
|
|
case CC_ARGHACK: /* Suggested by Rich Salz */
|
|
/* <rsalz@pineapple.bbn.com> */
|
|
continue; /* keep going... */
|
|
|
|
case CC_EOF: /* end of file typed */
|
|
if ((el->el_flags & UNBUFFERED) == 0)
|
|
num = 0;
|
|
else if (num == -1) {
|
|
*el->el_line.lastchar++ = CONTROL('d');
|
|
el->el_line.cursor = el->el_line.lastchar;
|
|
num = 1;
|
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}
|
|
break;
|
|
|
|
case CC_NEWLINE: /* normal end of line */
|
|
num = (int)(el->el_line.lastchar - el->el_line.buffer);
|
|
break;
|
|
|
|
case CC_FATAL: /* fatal error, reset to known state */
|
|
/* put (real) cursor in a known place */
|
|
re_clear_display(el); /* reset the display stuff */
|
|
ch_reset(el); /* reset the input pointers */
|
|
read_clearmacros(&el->el_read->macros);
|
|
re_refresh(el); /* print the prompt again */
|
|
break;
|
|
|
|
case CC_ERROR:
|
|
default: /* functions we don't know about */
|
|
terminal_beep(el);
|
|
terminal__flush(el);
|
|
break;
|
|
}
|
|
el->el_state.argument = 1;
|
|
el->el_state.doingarg = 0;
|
|
el->el_chared.c_vcmd.action = NOP;
|
|
if (el->el_flags & UNBUFFERED)
|
|
break;
|
|
}
|
|
|
|
terminal__flush(el); /* flush any buffered output */
|
|
/* make sure the tty is set up correctly */
|
|
if ((el->el_flags & UNBUFFERED) == 0) {
|
|
read_finish(el);
|
|
*nread = num != -1 ? num : 0;
|
|
} else {
|
|
*nread = (int)(el->el_line.lastchar - el->el_line.buffer);
|
|
}
|
|
goto done;
|
|
noedit:
|
|
el->el_line.cursor = el->el_line.lastchar = cp;
|
|
*cp = '\0';
|
|
*nread = (int)(el->el_line.cursor - el->el_line.buffer);
|
|
done:
|
|
if (*nread == 0) {
|
|
if (num == -1) {
|
|
*nread = -1;
|
|
if (el->el_read->read_errno)
|
|
errno = el->el_read->read_errno;
|
|
}
|
|
return NULL;
|
|
} else
|
|
return el->el_line.buffer;
|
|
}
|