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/*
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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 "monitor/readline.h" |
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#include "monitor/monitor.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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#undef printf
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#define printf do_not_use_printf
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void readline_show_prompt(ReadLineState *rs)
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{ |
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monitor_printf(rs->mon, "%s", rs->prompt);
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monitor_flush(rs->mon); |
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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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monitor_printf(rs->mon, "\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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monitor_printf(rs->mon, "*");
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} else {
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monitor_printf(rs->mon, "%s", rs->cmd_buf);
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} |
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monitor_printf(rs->mon, "\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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monitor_printf(rs->mon, "\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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monitor_printf(rs->mon, "\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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monitor_flush(rs->mon); |
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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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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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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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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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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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if (strcmp(hist_entry, cmdline) == 0) { |
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same_entry:
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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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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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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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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 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_malloc(rs->cmd_buf_index + 1);
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memcpy(cmdline, rs->cmd_buf, rs->cmd_buf_index); |
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cmdline[rs->cmd_buf_index] = '\0';
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rs->completion_finder(rs->mon, 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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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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} else {
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monitor_printf(rs->mon, "\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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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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if (len > max_width)
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max_width = len; |
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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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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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monitor_printf(rs->mon, "%-*s", max_width, rs->completions[i]);
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if (++j == nb_cols || i == (rs->nb_completions - 1)) { |
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monitor_printf(rs->mon, "\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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} |
340 |
for (i = 0; i < rs->nb_completions; i++) { |
341 |
g_free(rs->completions[i]); |
342 |
} |
343 |
} |
344 |
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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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350 |
switch(ch) {
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case 1: |
352 |
readline_bol(rs); |
353 |
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: |
358 |
readline_eol(rs); |
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break;
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case 9: |
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readline_completion(rs); |
362 |
break;
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case 10: |
364 |
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); |
368 |
monitor_printf(rs->mon, "\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->mon, rs->cmd_buf, rs->readline_opaque); |
374 |
break;
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case 23: |
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/* ^W */
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readline_backword(rs); |
378 |
break;
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case 27: |
380 |
rs->esc_state = IS_ESC; |
381 |
break;
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case 127: |
383 |
case 8: |
384 |
readline_backspace(rs); |
385 |
break;
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386 |
case 155: |
387 |
rs->esc_state = IS_CSI; |
388 |
break;
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389 |
default:
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390 |
if (ch >= 32) { |
391 |
readline_insert_char(rs, ch); |
392 |
} |
393 |
break;
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} |
395 |
break;
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396 |
case IS_ESC:
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397 |
if (ch == '[') { |
398 |
rs->esc_state = IS_CSI; |
399 |
rs->esc_param = 0;
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400 |
} else if (ch == 'O') { |
401 |
rs->esc_state = IS_SS3; |
402 |
rs->esc_param = 0;
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403 |
} else {
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404 |
rs->esc_state = IS_NORM; |
405 |
} |
406 |
break;
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407 |
case IS_CSI:
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408 |
switch(ch) {
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409 |
case 'A': |
410 |
case 'F': |
411 |
readline_up_char(rs); |
412 |
break;
|
413 |
case 'B': |
414 |
case 'E': |
415 |
readline_down_char(rs); |
416 |
break;
|
417 |
case 'D': |
418 |
readline_backward_char(rs); |
419 |
break;
|
420 |
case 'C': |
421 |
readline_forward_char(rs); |
422 |
break;
|
423 |
case '0' ... '9': |
424 |
rs->esc_param = rs->esc_param * 10 + (ch - '0'); |
425 |
goto the_end;
|
426 |
case '~': |
427 |
switch(rs->esc_param) {
|
428 |
case 1: |
429 |
readline_bol(rs); |
430 |
break;
|
431 |
case 3: |
432 |
readline_delete_char(rs); |
433 |
break;
|
434 |
case 4: |
435 |
readline_eol(rs); |
436 |
break;
|
437 |
} |
438 |
break;
|
439 |
default:
|
440 |
break;
|
441 |
} |
442 |
rs->esc_state = IS_NORM; |
443 |
the_end:
|
444 |
break;
|
445 |
case IS_SS3:
|
446 |
switch(ch) {
|
447 |
case 'F': |
448 |
readline_eol(rs); |
449 |
break;
|
450 |
case 'H': |
451 |
readline_bol(rs); |
452 |
break;
|
453 |
} |
454 |
rs->esc_state = IS_NORM; |
455 |
break;
|
456 |
} |
457 |
readline_update(rs); |
458 |
} |
459 |
|
460 |
void readline_start(ReadLineState *rs, const char *prompt, int read_password, |
461 |
ReadLineFunc *readline_func, void *opaque)
|
462 |
{ |
463 |
pstrcpy(rs->prompt, sizeof(rs->prompt), prompt);
|
464 |
rs->readline_func = readline_func; |
465 |
rs->readline_opaque = opaque; |
466 |
rs->read_password = read_password; |
467 |
readline_restart(rs); |
468 |
} |
469 |
|
470 |
void readline_restart(ReadLineState *rs)
|
471 |
{ |
472 |
rs->cmd_buf_index = 0;
|
473 |
rs->cmd_buf_size = 0;
|
474 |
} |
475 |
|
476 |
const char *readline_get_history(ReadLineState *rs, unsigned int index) |
477 |
{ |
478 |
if (index >= READLINE_MAX_CMDS)
|
479 |
return NULL; |
480 |
return rs->history[index];
|
481 |
} |
482 |
|
483 |
ReadLineState *readline_init(Monitor *mon, |
484 |
ReadLineCompletionFunc *completion_finder) |
485 |
{ |
486 |
ReadLineState *rs = g_malloc0(sizeof(*rs));
|
487 |
|
488 |
rs->hist_entry = -1;
|
489 |
rs->mon = mon; |
490 |
rs->completion_finder = completion_finder; |
491 |
|
492 |
return rs;
|
493 |
} |