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qemu-io: use readline.c

Browse source 
Use readline.c for command-line history.  There was support for GNU
Readline and BSD Editline but it was never compiled in.  Since QEMU has
its own readline.c, just use that when qemu-io runs with stdin attached
to a terminal.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2013-11-14 11:54:17 +01:00 committed by Kevin Wolf
parent 13401ba0b9
commit 0cf17e1817
1 changed files with 63 additions and 50 deletions
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113
qemu-io.c
View file

@ -18,6 +18,7 @@
#include "qemu/main-loop.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qemu/readline.h"
#include "block/block_int.h"
#include "trace/control.h"
@ -32,6 +33,8 @@ extern int qemuio_misalign;
static int ncmdline;
static char **cmdline;
static ReadLineState *readline_state;
static int close_f(BlockDriverState *bs, int argc, char **argv)
{
bdrv_unref(bs);
@ -203,14 +206,6 @@ static void usage(const char *name)
name);
}
#if defined(ENABLE_READLINE)
# include <readline/history.h>
# include <readline/readline.h>
#elif defined(ENABLE_EDITLINE)
# include <histedit.h>
#endif
static char *get_prompt(void)
{
static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
@ -222,52 +217,47 @@ static char *get_prompt(void)
return prompt;
}
#if defined(ENABLE_READLINE)
static char *fetchline(void)
static void readline_printf_func(void *opaque, const char *fmt, ...)
{
char *line = readline(get_prompt());
if (line && *line) {
add_history(line);
va_list ap;
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
}
static void readline_flush_func(void *opaque)
{
fflush(stdout);
}
static void readline_func(void *opaque, const char *str, void *readline_opaque)
{
char **line = readline_opaque;
*line = g_strdup(str);
}
static void readline_completion_func(void *opaque, const char *str)
{
/* No command or argument completion implemented yet */
}
static char *fetchline_readline(void)
{
char *line = NULL;
readline_start(readline_state, get_prompt(), 0, readline_func, &line);
while (!line) {
int ch = getchar();
if (ch == EOF) {
break;
}
readline_handle_byte(readline_state, ch);
}
return line;
}
#elif defined(ENABLE_EDITLINE)
static char *el_get_prompt(EditLine *e)
{
return get_prompt();
}
static char *fetchline(void)
{
static EditLine *el;
static History *hist;
HistEvent hevent;
char *line;
int count;
if (!el) {
hist = history_init();
history(hist, &hevent, H_SETSIZE, 100);
el = el_init(progname, stdin, stdout, stderr);
el_source(el, NULL);
el_set(el, EL_SIGNAL, 1);
el_set(el, EL_PROMPT, el_get_prompt);
el_set(el, EL_HIST, history, (const char *)hist);
}
line = strdup(el_gets(el, &count));
if (line) {
if (count > 0) {
line[count-1] = '\0';
}
if (*line) {
history(hist, &hevent, H_ENTER, line);
}
}
return line;
}
#else
# define MAXREADLINESZ 1024
static char *fetchline(void)
#define MAXREADLINESZ 1024
static char *fetchline_fgets(void)
{
char *p, *line = g_malloc(MAXREADLINESZ);
@ -283,7 +273,15 @@ static char *fetchline(void)
return line;
}
#endif
static char *fetchline(void)
{
if (readline_state) {
return fetchline_readline();
} else {
return fetchline_fgets();
}
}
static void prep_fetchline(void *opaque)
{
@ -339,6 +337,11 @@ static void add_user_command(char *optarg)
cmdline[ncmdline-1] = optarg;
}
static void reenable_tty_echo(void)
{
qemu_set_tty_echo(STDIN_FILENO, true);
}
int main(int argc, char **argv)
{
int readonly = 0;
@ -435,6 +438,15 @@ int main(int argc, char **argv)
qemuio_add_command(&open_cmd);
qemuio_add_command(&close_cmd);
if (isatty(STDIN_FILENO)) {
readline_state = readline_init(readline_printf_func,
readline_flush_func,
NULL,
readline_completion_func);
qemu_set_tty_echo(STDIN_FILENO, false);
atexit(reenable_tty_echo);
}
/* open the device */
if (!readonly) {
flags |= BDRV_O_RDWR;
@ -453,5 +465,6 @@ int main(int argc, char **argv)
if (qemuio_bs) {
bdrv_unref(qemuio_bs);
}
g_free(readline_state);
return 0;
}