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hmp: make memchar-read escape ASCII control chars except \n and \t

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Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Markus Armbruster 2013-02-06 21:27:26 +01:00 committed by Anthony Liguori
parent de1cc36e10
commit 543f34126b
2 changed files with 16 additions and 1 deletions
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2
hmp-commands.hx
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@ -869,6 +869,8 @@ STEXI
@findex ringbuf_read
Read and print up to @var{size} bytes from ring buffer character
device @var{device}.
Certain non-printable characters are printed \uXXXX, where XXXX is the
character code in hexadecimal. Character \ is printed \\.
Bug: can screw up when the buffer contains invalid UTF-8 sequences,
NUL characters, after the ring buffer lost data, and when reading
stops because the size limit is reached.

15
hmp.c
View File

@ -679,6 +679,7 @@ void hmp_ringbuf_read(Monitor *mon, const QDict *qdict)
const char *chardev = qdict_get_str(qdict, "device");
char *data;
Error *errp = NULL;
int i;
data = qmp_ringbuf_read(chardev, size, false, 0, &errp);
if (errp) {
@ -687,7 +688,19 @@ void hmp_ringbuf_read(Monitor *mon, const QDict *qdict)
return;
}
monitor_printf(mon, "%s\n", data);
for (i = 0; data[i]; i++) {
unsigned char ch = data[i];
if (ch == '\\') {
monitor_printf(mon, "\\\\");
} else if ((ch < 0x20 && ch != '\n' && ch != '\t') || ch == 0x7F) {
monitor_printf(mon, "\\u%04X", ch);
} else {
monitor_printf(mon, "%c", ch);
}
}
monitor_printf(mon, "\n");
g_free(data);
}