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qemu/readline.c

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/*
* QEMU readline utility
*
* Copyright (c) 2003-2004 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "readline.h"
#include "monitor.h"
#define IS_NORM 0
#define IS_ESC 1
#define IS_CSI 2
#undef printf
#define printf do_not_use_printf
void readline_show_prompt(ReadLineState *rs)
{
monitor_printf(rs->mon, "%s", rs->prompt);
monitor_flush(rs->mon);
rs->last_cmd_buf_index = 0;
rs->last_cmd_buf_size = 0;
rs->esc_state = IS_NORM;
}
/* update the displayed command line */
static void readline_update(ReadLineState *rs)
{
int i, delta, len;
if (rs->cmd_buf_size != rs->last_cmd_buf_size ||
memcmp(rs->cmd_buf, rs->last_cmd_buf, rs->cmd_buf_size) != 0) {
for(i = 0; i < rs->last_cmd_buf_index; i++) {
monitor_printf(rs->mon, "\033[D");
}
rs->cmd_buf[rs->cmd_buf_size] = '\0';
if (rs->read_password) {
len = strlen(rs->cmd_buf);
for(i = 0; i < len; i++)
monitor_printf(rs->mon, "*");
} else {
monitor_printf(rs->mon, "%s", rs->cmd_buf);
}
monitor_printf(rs->mon, "\033[K");
memcpy(rs->last_cmd_buf, rs->cmd_buf, rs->cmd_buf_size);
rs->last_cmd_buf_size = rs->cmd_buf_size;
rs->last_cmd_buf_index = rs->cmd_buf_size;
}
if (rs->cmd_buf_index != rs->last_cmd_buf_index) {
delta = rs->cmd_buf_index - rs->last_cmd_buf_index;
if (delta > 0) {
for(i = 0;i < delta; i++) {
monitor_printf(rs->mon, "\033[C");
}
} else {
delta = -delta;
for(i = 0;i < delta; i++) {
monitor_printf(rs->mon, "\033[D");
}
}
rs->last_cmd_buf_index = rs->cmd_buf_index;
}
monitor_flush(rs->mon);
}
static void readline_insert_char(ReadLineState *rs, int ch)
{
if (rs->cmd_buf_index < READLINE_CMD_BUF_SIZE) {
memmove(rs->cmd_buf + rs->cmd_buf_index + 1,
rs->cmd_buf + rs->cmd_buf_index,
rs->cmd_buf_size - rs->cmd_buf_index);
rs->cmd_buf[rs->cmd_buf_index] = ch;
rs->cmd_buf_size++;
rs->cmd_buf_index++;
}
}
static void readline_backward_char(ReadLineState *rs)
{
if (rs->cmd_buf_index > 0) {
rs->cmd_buf_index--;
}
}
static void readline_forward_char(ReadLineState *rs)
{
if (rs->cmd_buf_index < rs->cmd_buf_size) {
rs->cmd_buf_index++;
}
}
static void readline_delete_char(ReadLineState *rs)
{
if (rs->cmd_buf_index < rs->cmd_buf_size) {
memmove(rs->cmd_buf + rs->cmd_buf_index,
rs->cmd_buf + rs->cmd_buf_index + 1,
rs->cmd_buf_size - rs->cmd_buf_index - 1);
rs->cmd_buf_size--;
}
}
static void readline_backspace(ReadLineState *rs)
{
if (rs->cmd_buf_index > 0) {
readline_backward_char(rs);
readline_delete_char(rs);
}
}
static void readline_backword(ReadLineState *rs)
{
int start;
if (rs->cmd_buf_index == 0 || rs->cmd_buf_index > rs->cmd_buf_size) {
return;
}
start = rs->cmd_buf_index - 1;
/* find first word (backwards) */
while (start > 0) {
if (!qemu_isspace(rs->cmd_buf[start])) {
break;
}
--start;
}
/* find first space (backwards) */
while (start > 0) {
if (qemu_isspace(rs->cmd_buf[start])) {
++start;
break;
}
--start;
}
/* remove word */
if (start < rs->cmd_buf_index) {
memmove(rs->cmd_buf + start,
rs->cmd_buf + rs->cmd_buf_index,
rs->cmd_buf_size - rs->cmd_buf_index);
rs->cmd_buf_size -= rs->cmd_buf_index - start;
rs->cmd_buf_index = start;
}
}
static void readline_bol(ReadLineState *rs)
{
rs->cmd_buf_index = 0;
}
static void readline_eol(ReadLineState *rs)
{
rs->cmd_buf_index = rs->cmd_buf_size;
}
static void readline_up_char(ReadLineState *rs)
{
int idx;
if (rs->hist_entry == 0)
return;
if (rs->hist_entry == -1) {
/* Find latest entry */
for (idx = 0; idx < READLINE_MAX_CMDS; idx++) {
if (rs->history[idx] == NULL)
break;
}
rs->hist_entry = idx;
}
rs->hist_entry--;
if (rs->hist_entry >= 0) {
pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf),
rs->history[rs->hist_entry]);
rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf);
}
}
static void readline_down_char(ReadLineState *rs)
{
if (rs->hist_entry == -1)
return;
if (rs->hist_entry < READLINE_MAX_CMDS - 1 &&
rs->history[++rs->hist_entry] != NULL) {
pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf),
rs->history[rs->hist_entry]);
} else {
rs->cmd_buf[0] = 0;
rs->hist_entry = -1;
}
rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf);
}
static void readline_hist_add(ReadLineState *rs, const char *cmdline)
{
char *hist_entry, *new_entry;
int idx;
if (cmdline[0] == '\0')
return;
new_entry = NULL;
if (rs->hist_entry != -1) {
/* We were editing an existing history entry: replace it */
hist_entry = rs->history[rs->hist_entry];
idx = rs->hist_entry;
if (strcmp(hist_entry, cmdline) == 0) {
goto same_entry;
}
}
/* Search cmdline in history buffers */
for (idx = 0; idx < READLINE_MAX_CMDS; idx++) {
hist_entry = rs->history[idx];
if (hist_entry == NULL)
break;
if (strcmp(hist_entry, cmdline) == 0) {
same_entry:
new_entry = hist_entry;
/* Put this entry at the end of history */
memmove(&rs->history[idx], &rs->history[idx + 1],
(READLINE_MAX_CMDS - (idx + 1)) * sizeof(char *));
rs->history[READLINE_MAX_CMDS - 1] = NULL;
for (; idx < READLINE_MAX_CMDS; idx++) {
if (rs->history[idx] == NULL)
break;
}
break;
}
}
if (idx == READLINE_MAX_CMDS) {
/* Need to get one free slot */
free(rs->history[0]);
memcpy(rs->history, &rs->history[1],
(READLINE_MAX_CMDS - 1) * sizeof(char *));
rs->history[READLINE_MAX_CMDS - 1] = NULL;
idx = READLINE_MAX_CMDS - 1;
}
if (new_entry == NULL)
new_entry = strdup(cmdline);
rs->history[idx] = new_entry;
rs->hist_entry = -1;
}
/* completion support */
void readline_add_completion(ReadLineState *rs, const char *str)
{
if (rs->nb_completions < READLINE_MAX_COMPLETIONS) {
rs->completions[rs->nb_completions++] = g_strdup(str);
}
}
void readline_set_completion_index(ReadLineState *rs, int index)
{
rs->completion_index = index;
}
static void readline_completion(ReadLineState *rs)
{
Monitor *mon = cur_mon;
int len, i, j, max_width, nb_cols, max_prefix;
char *cmdline;
rs->nb_completions = 0;
cmdline = g_malloc(rs->cmd_buf_index + 1);
memcpy(cmdline, rs->cmd_buf, rs->cmd_buf_index);
cmdline[rs->cmd_buf_index] = '\0';
rs->completion_finder(cmdline);
g_free(cmdline);
/* no completion found */
if (rs->nb_completions <= 0)
return;
if (rs->nb_completions == 1) {
len = strlen(rs->completions[0]);
for(i = rs->completion_index; i < len; i++) {
readline_insert_char(rs, rs->completions[0][i]);
}
/* extra space for next argument. XXX: make it more generic */
if (len > 0 && rs->completions[0][len - 1] != '/')
readline_insert_char(rs, ' ');
} else {
monitor_printf(mon, "\n");
max_width = 0;
max_prefix = 0;
for(i = 0; i < rs->nb_completions; i++) {
len = strlen(rs->completions[i]);
if (i==0) {
max_prefix = len;
} else {
if (len < max_prefix)
max_prefix = len;
for(j=0; j<max_prefix; j++) {
if (rs->completions[i][j] != rs->completions[0][j])
max_prefix = j;
}
}
if (len > max_width)
max_width = len;
}
if (max_prefix > 0)
for(i = rs->completion_index; i < max_prefix; i++) {
readline_insert_char(rs, rs->completions[0][i]);
}
max_width += 2;
if (max_width < 10)
max_width = 10;
else if (max_width > 80)
max_width = 80;
nb_cols = 80 / max_width;
j = 0;
for(i = 0; i < rs->nb_completions; i++) {
monitor_printf(rs->mon, "%-*s", max_width, rs->completions[i]);
if (++j == nb_cols || i == (rs->nb_completions - 1)) {
monitor_printf(rs->mon, "\n");
j = 0;
}
}
readline_show_prompt(rs);
}
}
/* return true if command handled */
void readline_handle_byte(ReadLineState *rs, int ch)
{
switch(rs->esc_state) {
case IS_NORM:
switch(ch) {
case 1:
readline_bol(rs);
break;
case 4:
readline_delete_char(rs);
break;
case 5:
readline_eol(rs);
break;
case 9:
readline_completion(rs);
break;
case 10:
case 13:
rs->cmd_buf[rs->cmd_buf_size] = '\0';
if (!rs->read_password)
readline_hist_add(rs, rs->cmd_buf);
monitor_printf(rs->mon, "\n");
rs->cmd_buf_index = 0;
rs->cmd_buf_size = 0;
rs->last_cmd_buf_index = 0;
rs->last_cmd_buf_size = 0;
rs->readline_func(rs->mon, rs->cmd_buf, rs->readline_opaque);
break;
case 23:
/* ^W */
readline_backword(rs);
break;
case 27:
rs->esc_state = IS_ESC;
break;
case 127:
case 8:
readline_backspace(rs);
break;
case 155:
rs->esc_state = IS_CSI;
break;
default:
if (ch >= 32) {
readline_insert_char(rs, ch);
}
break;
}
break;
case IS_ESC:
if (ch == '[') {
rs->esc_state = IS_CSI;
rs->esc_param = 0;
} else {
rs->esc_state = IS_NORM;
}
break;
case IS_CSI:
switch(ch) {
case 'A':
case 'F':
readline_up_char(rs);
break;
case 'B':
case 'E':
readline_down_char(rs);
break;
case 'D':
readline_backward_char(rs);
break;
case 'C':
readline_forward_char(rs);
break;
case '0' ... '9':
rs->esc_param = rs->esc_param * 10 + (ch - '0');
goto the_end;
case '~':
switch(rs->esc_param) {
case 1:
readline_bol(rs);
break;
case 3:
readline_delete_char(rs);
break;
case 4:
readline_eol(rs);
break;
}
break;
default:
break;
}
rs->esc_state = IS_NORM;
the_end:
break;
}
readline_update(rs);
}
void readline_start(ReadLineState *rs, const char *prompt, int read_password,
ReadLineFunc *readline_func, void *opaque)
{
pstrcpy(rs->prompt, sizeof(rs->prompt), prompt);
rs->readline_func = readline_func;
rs->readline_opaque = opaque;
rs->read_password = read_password;
readline_restart(rs);
}
void readline_restart(ReadLineState *rs)
{
rs->cmd_buf_index = 0;
rs->cmd_buf_size = 0;
}
const char *readline_get_history(ReadLineState *rs, unsigned int index)
{
if (index >= READLINE_MAX_CMDS)
return NULL;
return rs->history[index];
}
ReadLineState *readline_init(Monitor *mon,
ReadLineCompletionFunc *completion_finder)
{
ReadLineState *rs = g_malloc0(sizeof(*rs));
rs->hist_entry = -1;
rs->mon = mon;
rs->completion_finder = completion_finder;
return rs;
}
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