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When the 'cmdline' is the last entry in 'rs->history' array, there is no need to put this entry to the end of the array, partly because it is the last entry, and partly because the next operition will lead to array index out of bounds. Reported-by: Euler Robot <euler.robot@huawei.com> Signed-off-by: Alex Chen <alex.chen@huawei.com> Message-id: 20201203135043.117072-1-alex.chen@huawei.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
550 lines
15 KiB
C
550 lines
15 KiB
C
/*
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* QEMU readline utility
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/readline.h"
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#include "qemu/ctype.h"
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#include "qemu/cutils.h"
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#define IS_NORM 0
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#define IS_ESC 1
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#define IS_CSI 2
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#define IS_SS3 3
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void readline_show_prompt(ReadLineState *rs)
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{
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rs->printf_func(rs->opaque, "%s", rs->prompt);
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rs->flush_func(rs->opaque);
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rs->last_cmd_buf_index = 0;
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rs->last_cmd_buf_size = 0;
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rs->esc_state = IS_NORM;
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}
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/* update the displayed command line */
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static void readline_update(ReadLineState *rs)
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{
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int i, delta, len;
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if (rs->cmd_buf_size != rs->last_cmd_buf_size ||
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memcmp(rs->cmd_buf, rs->last_cmd_buf, rs->cmd_buf_size) != 0) {
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for (i = 0; i < rs->last_cmd_buf_index; i++) {
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rs->printf_func(rs->opaque, "\033[D");
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}
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rs->cmd_buf[rs->cmd_buf_size] = '\0';
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if (rs->read_password) {
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len = strlen(rs->cmd_buf);
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for (i = 0; i < len; i++) {
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rs->printf_func(rs->opaque, "*");
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}
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} else {
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rs->printf_func(rs->opaque, "%s", rs->cmd_buf);
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}
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rs->printf_func(rs->opaque, "\033[K");
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memcpy(rs->last_cmd_buf, rs->cmd_buf, rs->cmd_buf_size);
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rs->last_cmd_buf_size = rs->cmd_buf_size;
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rs->last_cmd_buf_index = rs->cmd_buf_size;
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}
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if (rs->cmd_buf_index != rs->last_cmd_buf_index) {
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delta = rs->cmd_buf_index - rs->last_cmd_buf_index;
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if (delta > 0) {
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for (i = 0; i < delta; i++) {
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rs->printf_func(rs->opaque, "\033[C");
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}
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} else {
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delta = -delta;
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for (i = 0; i < delta; i++) {
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rs->printf_func(rs->opaque, "\033[D");
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}
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}
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rs->last_cmd_buf_index = rs->cmd_buf_index;
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}
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rs->flush_func(rs->opaque);
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}
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static void readline_insert_char(ReadLineState *rs, int ch)
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{
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if (rs->cmd_buf_index < READLINE_CMD_BUF_SIZE) {
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memmove(rs->cmd_buf + rs->cmd_buf_index + 1,
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rs->cmd_buf + rs->cmd_buf_index,
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rs->cmd_buf_size - rs->cmd_buf_index);
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rs->cmd_buf[rs->cmd_buf_index] = ch;
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rs->cmd_buf_size++;
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rs->cmd_buf_index++;
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}
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}
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static void readline_backward_char(ReadLineState *rs)
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{
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if (rs->cmd_buf_index > 0) {
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rs->cmd_buf_index--;
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}
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}
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static void readline_forward_char(ReadLineState *rs)
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{
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if (rs->cmd_buf_index < rs->cmd_buf_size) {
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rs->cmd_buf_index++;
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}
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}
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static void readline_delete_char(ReadLineState *rs)
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{
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if (rs->cmd_buf_index < rs->cmd_buf_size) {
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memmove(rs->cmd_buf + rs->cmd_buf_index,
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rs->cmd_buf + rs->cmd_buf_index + 1,
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rs->cmd_buf_size - rs->cmd_buf_index - 1);
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rs->cmd_buf_size--;
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}
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}
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static void readline_backspace(ReadLineState *rs)
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{
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if (rs->cmd_buf_index > 0) {
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readline_backward_char(rs);
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readline_delete_char(rs);
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}
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}
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static void readline_backword(ReadLineState *rs)
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{
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int start;
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if (rs->cmd_buf_index == 0 || rs->cmd_buf_index > rs->cmd_buf_size) {
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return;
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}
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start = rs->cmd_buf_index - 1;
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/* find first word (backwards) */
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while (start > 0) {
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if (!qemu_isspace(rs->cmd_buf[start])) {
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break;
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}
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--start;
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}
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/* find first space (backwards) */
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while (start > 0) {
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if (qemu_isspace(rs->cmd_buf[start])) {
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++start;
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break;
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}
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--start;
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}
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/* remove word */
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if (start < rs->cmd_buf_index) {
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memmove(rs->cmd_buf + start,
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rs->cmd_buf + rs->cmd_buf_index,
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rs->cmd_buf_size - rs->cmd_buf_index);
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rs->cmd_buf_size -= rs->cmd_buf_index - start;
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rs->cmd_buf_index = start;
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}
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}
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static void readline_bol(ReadLineState *rs)
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{
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rs->cmd_buf_index = 0;
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}
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static void readline_eol(ReadLineState *rs)
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{
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rs->cmd_buf_index = rs->cmd_buf_size;
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}
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static void readline_up_char(ReadLineState *rs)
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{
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int idx;
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if (rs->hist_entry == 0) {
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return;
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}
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if (rs->hist_entry == -1) {
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/* Find latest entry */
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for (idx = 0; idx < READLINE_MAX_CMDS; idx++) {
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if (rs->history[idx] == NULL) {
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break;
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}
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}
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rs->hist_entry = idx;
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}
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rs->hist_entry--;
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if (rs->hist_entry >= 0) {
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pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf),
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rs->history[rs->hist_entry]);
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rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf);
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}
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}
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static void readline_down_char(ReadLineState *rs)
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{
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if (rs->hist_entry == -1) {
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return;
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}
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if (rs->hist_entry < READLINE_MAX_CMDS - 1 &&
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rs->history[++rs->hist_entry] != NULL) {
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pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf),
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rs->history[rs->hist_entry]);
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} else {
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rs->cmd_buf[0] = 0;
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rs->hist_entry = -1;
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}
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rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf);
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}
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static void readline_hist_add(ReadLineState *rs, const char *cmdline)
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{
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char *hist_entry, *new_entry;
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int idx;
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if (cmdline[0] == '\0') {
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return;
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}
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new_entry = NULL;
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if (rs->hist_entry != -1) {
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/* We were editing an existing history entry: replace it */
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hist_entry = rs->history[rs->hist_entry];
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idx = rs->hist_entry;
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if (strcmp(hist_entry, cmdline) == 0) {
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goto same_entry;
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}
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}
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/* Search cmdline in history buffers */
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for (idx = 0; idx < READLINE_MAX_CMDS; idx++) {
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hist_entry = rs->history[idx];
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if (hist_entry == NULL) {
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break;
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}
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if (strcmp(hist_entry, cmdline) == 0) {
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same_entry:
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if (idx == READLINE_MAX_CMDS - 1) {
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return;
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}
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new_entry = hist_entry;
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/* Put this entry at the end of history */
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memmove(&rs->history[idx], &rs->history[idx + 1],
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(READLINE_MAX_CMDS - (idx + 1)) * sizeof(char *));
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rs->history[READLINE_MAX_CMDS - 1] = NULL;
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for (; idx < READLINE_MAX_CMDS; idx++) {
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if (rs->history[idx] == NULL) {
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break;
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}
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}
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break;
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}
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}
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if (idx == READLINE_MAX_CMDS) {
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/* Need to get one free slot */
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g_free(rs->history[0]);
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memmove(rs->history, &rs->history[1],
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(READLINE_MAX_CMDS - 1) * sizeof(char *));
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rs->history[READLINE_MAX_CMDS - 1] = NULL;
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idx = READLINE_MAX_CMDS - 1;
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}
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if (new_entry == NULL) {
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new_entry = g_strdup(cmdline);
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}
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rs->history[idx] = new_entry;
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rs->hist_entry = -1;
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}
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/* completion support */
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void readline_add_completion(ReadLineState *rs, const char *str)
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{
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if (rs->nb_completions < READLINE_MAX_COMPLETIONS) {
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int i;
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for (i = 0; i < rs->nb_completions; i++) {
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if (!strcmp(rs->completions[i], str)) {
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return;
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}
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}
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rs->completions[rs->nb_completions++] = g_strdup(str);
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}
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}
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void readline_set_completion_index(ReadLineState *rs, int index)
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{
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rs->completion_index = index;
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}
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static int completion_comp(const void *a, const void *b)
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{
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return strcmp(*(const char **) a, *(const char **) b);
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}
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static void readline_completion(ReadLineState *rs)
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{
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int len, i, j, max_width, nb_cols, max_prefix;
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char *cmdline;
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rs->nb_completions = 0;
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cmdline = g_strndup(rs->cmd_buf, rs->cmd_buf_index);
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rs->completion_finder(rs->opaque, cmdline);
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g_free(cmdline);
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/* no completion found */
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if (rs->nb_completions <= 0) {
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return;
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}
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if (rs->nb_completions == 1) {
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len = strlen(rs->completions[0]);
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for (i = rs->completion_index; i < len; i++) {
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readline_insert_char(rs, rs->completions[0][i]);
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}
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/* extra space for next argument. XXX: make it more generic */
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if (len > 0 && rs->completions[0][len - 1] != '/') {
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readline_insert_char(rs, ' ');
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}
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} else {
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qsort(rs->completions, rs->nb_completions, sizeof(char *),
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completion_comp);
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rs->printf_func(rs->opaque, "\n");
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max_width = 0;
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max_prefix = 0;
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for (i = 0; i < rs->nb_completions; i++) {
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len = strlen(rs->completions[i]);
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if (i == 0) {
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max_prefix = len;
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} else {
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if (len < max_prefix) {
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max_prefix = len;
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}
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for (j = 0; j < max_prefix; j++) {
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if (rs->completions[i][j] != rs->completions[0][j]) {
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max_prefix = j;
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}
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}
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}
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if (len > max_width) {
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max_width = len;
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}
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}
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if (max_prefix > 0)
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for (i = rs->completion_index; i < max_prefix; i++) {
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readline_insert_char(rs, rs->completions[0][i]);
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}
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max_width += 2;
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if (max_width < 10) {
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max_width = 10;
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} else if (max_width > 80) {
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max_width = 80;
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}
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nb_cols = 80 / max_width;
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j = 0;
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for (i = 0; i < rs->nb_completions; i++) {
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rs->printf_func(rs->opaque, "%-*s", max_width, rs->completions[i]);
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if (++j == nb_cols || i == (rs->nb_completions - 1)) {
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rs->printf_func(rs->opaque, "\n");
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j = 0;
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}
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}
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readline_show_prompt(rs);
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}
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for (i = 0; i < rs->nb_completions; i++) {
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g_free(rs->completions[i]);
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}
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}
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static void readline_clear_screen(ReadLineState *rs)
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{
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rs->printf_func(rs->opaque, "\033[2J\033[1;1H");
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readline_show_prompt(rs);
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}
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/* return true if command handled */
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void readline_handle_byte(ReadLineState *rs, int ch)
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{
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switch (rs->esc_state) {
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case IS_NORM:
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switch (ch) {
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case 1:
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readline_bol(rs);
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break;
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case 4:
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readline_delete_char(rs);
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break;
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case 5:
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readline_eol(rs);
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break;
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case 9:
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readline_completion(rs);
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break;
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case 12:
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readline_clear_screen(rs);
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break;
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case 10:
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case 13:
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rs->cmd_buf[rs->cmd_buf_size] = '\0';
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if (!rs->read_password) {
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readline_hist_add(rs, rs->cmd_buf);
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}
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rs->printf_func(rs->opaque, "\n");
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rs->cmd_buf_index = 0;
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rs->cmd_buf_size = 0;
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rs->last_cmd_buf_index = 0;
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rs->last_cmd_buf_size = 0;
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rs->readline_func(rs->opaque, rs->cmd_buf, rs->readline_opaque);
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break;
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case 23:
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/* ^W */
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readline_backword(rs);
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break;
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case 27:
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rs->esc_state = IS_ESC;
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break;
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case 127:
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case 8:
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readline_backspace(rs);
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break;
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case 155:
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rs->esc_state = IS_CSI;
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break;
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default:
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if (ch >= 32) {
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readline_insert_char(rs, ch);
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}
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break;
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}
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break;
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case IS_ESC:
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if (ch == '[') {
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rs->esc_state = IS_CSI;
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rs->esc_param = 0;
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} else if (ch == 'O') {
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rs->esc_state = IS_SS3;
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rs->esc_param = 0;
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} else {
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rs->esc_state = IS_NORM;
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}
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break;
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case IS_CSI:
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switch (ch) {
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case 'A':
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case 'F':
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readline_up_char(rs);
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break;
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case 'B':
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case 'E':
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readline_down_char(rs);
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break;
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case 'D':
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readline_backward_char(rs);
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break;
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case 'C':
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readline_forward_char(rs);
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break;
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case '0' ... '9':
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rs->esc_param = rs->esc_param * 10 + (ch - '0');
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goto the_end;
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case '~':
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switch (rs->esc_param) {
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case 1:
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readline_bol(rs);
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break;
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case 3:
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readline_delete_char(rs);
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break;
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case 4:
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readline_eol(rs);
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break;
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}
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break;
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default:
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break;
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}
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rs->esc_state = IS_NORM;
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the_end:
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break;
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case IS_SS3:
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switch (ch) {
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case 'F':
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readline_eol(rs);
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break;
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case 'H':
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readline_bol(rs);
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break;
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}
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rs->esc_state = IS_NORM;
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break;
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}
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readline_update(rs);
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}
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void readline_start(ReadLineState *rs, const char *prompt, int read_password,
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ReadLineFunc *readline_func, void *opaque)
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{
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pstrcpy(rs->prompt, sizeof(rs->prompt), prompt);
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rs->readline_func = readline_func;
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rs->readline_opaque = opaque;
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rs->read_password = read_password;
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readline_restart(rs);
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}
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void readline_restart(ReadLineState *rs)
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{
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rs->cmd_buf_index = 0;
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rs->cmd_buf_size = 0;
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}
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const char *readline_get_history(ReadLineState *rs, unsigned int index)
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{
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if (index >= READLINE_MAX_CMDS) {
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return NULL;
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}
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return rs->history[index];
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|
}
|
|
|
|
void readline_free(ReadLineState *rs)
|
|
{
|
|
int i;
|
|
|
|
if (!rs) {
|
|
return;
|
|
}
|
|
for (i = 0; i < READLINE_MAX_CMDS; i++) {
|
|
g_free(rs->history[i]);
|
|
}
|
|
g_free(rs);
|
|
}
|
|
|
|
ReadLineState *readline_init(ReadLinePrintfFunc *printf_func,
|
|
ReadLineFlushFunc *flush_func,
|
|
void *opaque,
|
|
ReadLineCompletionFunc *completion_finder)
|
|
{
|
|
ReadLineState *rs = g_new0(ReadLineState, 1);
|
|
|
|
rs->hist_entry = -1;
|
|
rs->opaque = opaque;
|
|
rs->printf_func = printf_func;
|
|
rs->flush_func = flush_func;
|
|
rs->completion_finder = completion_finder;
|
|
|
|
return rs;
|
|
}
|