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qemu-patch-raspberry4/readline.c
aliguori 376253ece4 monitor: Rework API (Jan Kiszka) 
Refactor the monitor API and prepare it for decoupled terminals:
term_print functions are renamed to monitor_* and all monitor services
gain a new parameter (mon) that will once refer to the monitor instance
the output is supposed to appear on. However, the argument remains
unused for now. All monitor command callbacks are also extended by a mon
parameter so that command handlers are able to pass an appropriate
reference to monitor output services.

For the case that monitor outputs so far happen without clearly
identifiable context, the global variable cur_mon is introduced that
shall once provide a pointer either to the current active monitor (while
processing commands) or to the default one. On the mid or long term,
those use case will be obsoleted so that this variable can be removed
again.

Due to the broad usage of the monitor interface, this patch mostly deals
with converting users of the monitor API. A few of them are already
extended to pass 'mon' from the command handler further down to internal
functions that invoke monitor_printf.

At this chance, monitor-related prototypes are moved from console.h to
a new monitor.h. The same is done for the readline API.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6711 c046a42c-6fe2-441c-8c8c-71466251a162
2009-03-05 23:01:23 +00:00

490 lines
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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 TERM_CMD_BUF_SIZE 4095
#define TERM_MAX_CMDS 64
#define NB_COMPLETIONS_MAX 256
#define IS_NORM 0
#define IS_ESC 1
#define IS_CSI 2
#define printf do_not_use_printf
static char term_cmd_buf[TERM_CMD_BUF_SIZE + 1];
static int term_cmd_buf_index;
static int term_cmd_buf_size;
static char term_last_cmd_buf[TERM_CMD_BUF_SIZE + 1];
static int term_last_cmd_buf_index;
static int term_last_cmd_buf_size;
static int term_esc_state;
static int term_esc_param;
static char *term_history[TERM_MAX_CMDS];
static int term_hist_entry = -1;
static int nb_completions;
static int completion_index;
static char *completions[NB_COMPLETIONS_MAX];
static ReadLineFunc *term_readline_func;
static int term_is_password;
static char term_prompt[256];
static void *term_readline_opaque;
void readline_show_prompt(void)
{
Monitor *mon = cur_mon;
monitor_printf(mon, "%s", term_prompt);
monitor_flush(mon);
term_last_cmd_buf_index = 0;
term_last_cmd_buf_size = 0;
term_esc_state = IS_NORM;
}
/* update the displayed command line */
static void term_update(void)
{
Monitor *mon = cur_mon;
int i, delta, len;
if (term_cmd_buf_size != term_last_cmd_buf_size ||
memcmp(term_cmd_buf, term_last_cmd_buf, term_cmd_buf_size) != 0) {
for(i = 0; i < term_last_cmd_buf_index; i++) {
monitor_printf(mon, "\033[D");
}
term_cmd_buf[term_cmd_buf_size] = '\0';
if (term_is_password) {
len = strlen(term_cmd_buf);
for(i = 0; i < len; i++)
monitor_printf(mon, "*");
} else {
monitor_printf(mon, "%s", term_cmd_buf);
}
monitor_printf(mon, "\033[K");
memcpy(term_last_cmd_buf, term_cmd_buf, term_cmd_buf_size);
term_last_cmd_buf_size = term_cmd_buf_size;
term_last_cmd_buf_index = term_cmd_buf_size;
}
if (term_cmd_buf_index != term_last_cmd_buf_index) {
delta = term_cmd_buf_index - term_last_cmd_buf_index;
if (delta > 0) {
for(i = 0;i < delta; i++) {
monitor_printf(mon, "\033[C");
}
} else {
delta = -delta;
for(i = 0;i < delta; i++) {
monitor_printf(mon, "\033[D");
}
}
term_last_cmd_buf_index = term_cmd_buf_index;
}
monitor_flush(mon);
}
static void term_insert_char(int ch)
{
if (term_cmd_buf_index < TERM_CMD_BUF_SIZE) {
memmove(term_cmd_buf + term_cmd_buf_index + 1,
term_cmd_buf + term_cmd_buf_index,
term_cmd_buf_size - term_cmd_buf_index);
term_cmd_buf[term_cmd_buf_index] = ch;
term_cmd_buf_size++;
term_cmd_buf_index++;
}
}
static void term_backward_char(void)
{
if (term_cmd_buf_index > 0) {
term_cmd_buf_index--;
}
}
static void term_forward_char(void)
{
if (term_cmd_buf_index < term_cmd_buf_size) {
term_cmd_buf_index++;
}
}
static void term_delete_char(void)
{
if (term_cmd_buf_index < term_cmd_buf_size) {
memmove(term_cmd_buf + term_cmd_buf_index,
term_cmd_buf + term_cmd_buf_index + 1,
term_cmd_buf_size - term_cmd_buf_index - 1);
term_cmd_buf_size--;
}
}
static void term_backspace(void)
{
if (term_cmd_buf_index > 0) {
term_backward_char();
term_delete_char();
}
}
static void term_backword(void)
{
int start;
if (term_cmd_buf_index == 0 || term_cmd_buf_index > term_cmd_buf_size) {
return;
}
start = term_cmd_buf_index - 1;
/* find first word (backwards) */
while (start > 0) {
if (!qemu_isspace(term_cmd_buf[start])) {
break;
}
--start;
}
/* find first space (backwards) */
while (start > 0) {
if (qemu_isspace(term_cmd_buf[start])) {
++start;
break;
}
--start;
}
/* remove word */
if (start < term_cmd_buf_index) {
memmove(term_cmd_buf + start,
term_cmd_buf + term_cmd_buf_index,
term_cmd_buf_size - term_cmd_buf_index);
term_cmd_buf_size -= term_cmd_buf_index - start;
term_cmd_buf_index = start;
}
}
static void term_bol(void)
{
term_cmd_buf_index = 0;
}
static void term_eol(void)
{
term_cmd_buf_index = term_cmd_buf_size;
}
static void term_up_char(void)
{
int idx;
if (term_hist_entry == 0)
return;
if (term_hist_entry == -1) {
/* Find latest entry */
for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
if (term_history[idx] == NULL)
break;
}
term_hist_entry = idx;
}
term_hist_entry--;
if (term_hist_entry >= 0) {
pstrcpy(term_cmd_buf, sizeof(term_cmd_buf),
term_history[term_hist_entry]);
term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
}
}
static void term_down_char(void)
{
if (term_hist_entry == TERM_MAX_CMDS - 1 || term_hist_entry == -1)
return;
if (term_history[++term_hist_entry] != NULL) {
pstrcpy(term_cmd_buf, sizeof(term_cmd_buf),
term_history[term_hist_entry]);
} else {
term_hist_entry = -1;
}
term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
}
static void term_hist_add(const char *cmdline)
{
char *hist_entry, *new_entry;
int idx;
if (cmdline[0] == '\0')
return;
new_entry = NULL;
if (term_hist_entry != -1) {
/* We were editing an existing history entry: replace it */
hist_entry = term_history[term_hist_entry];
idx = term_hist_entry;
if (strcmp(hist_entry, cmdline) == 0) {
goto same_entry;
}
}
/* Search cmdline in history buffers */
for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
hist_entry = term_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(&term_history[idx], &term_history[idx + 1],
(TERM_MAX_CMDS - idx + 1) * sizeof(char *));
term_history[TERM_MAX_CMDS - 1] = NULL;
for (; idx < TERM_MAX_CMDS; idx++) {
if (term_history[idx] == NULL)
break;
}
break;
}
}
if (idx == TERM_MAX_CMDS) {
/* Need to get one free slot */
free(term_history[0]);
memcpy(term_history, &term_history[1],
(TERM_MAX_CMDS - 1) * sizeof(char *));
term_history[TERM_MAX_CMDS - 1] = NULL;
idx = TERM_MAX_CMDS - 1;
}
if (new_entry == NULL)
new_entry = strdup(cmdline);
term_history[idx] = new_entry;
term_hist_entry = -1;
}
/* completion support */
void readline_add_completion(const char *str)
{
if (nb_completions < NB_COMPLETIONS_MAX) {
completions[nb_completions++] = qemu_strdup(str);
}
}
void readline_set_completion_index(int index)
{
completion_index = index;
}
static void term_completion(void)
{
Monitor *mon = cur_mon;
int len, i, j, max_width, nb_cols, max_prefix;
char *cmdline;
nb_completions = 0;
cmdline = qemu_malloc(term_cmd_buf_index + 1);
memcpy(cmdline, term_cmd_buf, term_cmd_buf_index);
cmdline[term_cmd_buf_index] = '\0';
readline_find_completion(cmdline);
qemu_free(cmdline);
/* no completion found */
if (nb_completions <= 0)
return;
if (nb_completions == 1) {
len = strlen(completions[0]);
for(i = completion_index; i < len; i++) {
term_insert_char(completions[0][i]);
}
/* extra space for next argument. XXX: make it more generic */
if (len > 0 && completions[0][len - 1] != '/')
term_insert_char(' ');
} else {
monitor_printf(mon, "\n");
max_width = 0;
max_prefix = 0;
for(i = 0; i < nb_completions; i++) {
len = strlen(completions[i]);
if (i==0) {
max_prefix = len;
} else {
if (len < max_prefix)
max_prefix = len;
for(j=0; j<max_prefix; j++) {
if (completions[i][j] != completions[0][j])
max_prefix = j;
}
}
if (len > max_width)
max_width = len;
}
if (max_prefix > 0)
for(i = completion_index; i < max_prefix; i++) {
term_insert_char(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 < nb_completions; i++) {
monitor_printf(mon, "%-*s", max_width, completions[i]);
if (++j == nb_cols || i == (nb_completions - 1)) {
monitor_printf(mon, "\n");
j = 0;
}
}
readline_show_prompt();
}
}
/* return true if command handled */
void readline_handle_byte(int ch)
{
Monitor *mon = cur_mon;
switch(term_esc_state) {
case IS_NORM:
switch(ch) {
case 1:
term_bol();
break;
case 4:
term_delete_char();
break;
case 5:
term_eol();
break;
case 9:
term_completion();
break;
case 10:
case 13:
term_cmd_buf[term_cmd_buf_size] = '\0';
if (!term_is_password)
term_hist_add(term_cmd_buf);
monitor_printf(mon, "\n");
term_cmd_buf_index = 0;
term_cmd_buf_size = 0;
term_last_cmd_buf_index = 0;
term_last_cmd_buf_size = 0;
/* NOTE: readline_start can be called here */
term_readline_func(mon, term_cmd_buf, term_readline_opaque);
break;
case 23:
/* ^W */
term_backword();
break;
case 27:
term_esc_state = IS_ESC;
break;
case 127:
case 8:
term_backspace();
break;
case 155:
term_esc_state = IS_CSI;
break;
default:
if (ch >= 32) {
term_insert_char(ch);
}
break;
}
break;
case IS_ESC:
if (ch == '[') {
term_esc_state = IS_CSI;
term_esc_param = 0;
} else {
term_esc_state = IS_NORM;
}
break;
case IS_CSI:
switch(ch) {
case 'A':
case 'F':
term_up_char();
break;
case 'B':
case 'E':
term_down_char();
break;
case 'D':
term_backward_char();
break;
case 'C':
term_forward_char();
break;
case '0' ... '9':
term_esc_param = term_esc_param * 10 + (ch - '0');
goto the_end;
case '~':
switch(term_esc_param) {
case 1:
term_bol();
break;
case 3:
term_delete_char();
break;
case 4:
term_eol();
break;
}
break;
default:
break;
}
term_esc_state = IS_NORM;
the_end:
break;
}
term_update();
}
void readline_start(const char *prompt, int is_password,
ReadLineFunc *readline_func, void *opaque)
{
pstrcpy(term_prompt, sizeof(term_prompt), prompt);
term_readline_func = readline_func;
term_readline_opaque = opaque;
term_is_password = is_password;
term_cmd_buf_index = 0;
term_cmd_buf_size = 0;
}
const char *readline_get_history(unsigned int index)
{
if (index >= TERM_MAX_CMDS)
return NULL;
return term_history[index];
}
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