qemu/util/qemu-print.c
Markus Armbruster 19aaa4c3fd qemu-print: New qemu_fprintf(), qemu_vfprintf()
Code that doesn't want to know about current monitor vs. stdout
vs. stderr takes an fprintf_function callback and a FILE * argument to
pass to it.  Actual arguments are either fprintf() and stdout or
stderr, or monitor_fprintf() and the current monitor cast to FILE *.
monitor_fprintf() casts it right back, and is otherwise identical to
monitor_printf().  The type-punning is ugly.

New qemu_fprintf() and qemu_vprintf() address this need without type
punning: they are like fprintf() and vfprintf(), except they print to
the current monitor when passed a null FILE *.  The next commits will
put them to use.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190417191805.28198-14-armbru@redhat.com>
2019-04-18 22:18:59 +02:00

70 lines
1.4 KiB
C

/*
* Print to stream or current monitor
*
* Copyright (C) 2019 Red Hat Inc.
*
* Authors:
* Markus Armbruster <armbru@redhat.com>,
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "monitor/monitor.h"
#include "qemu/qemu-print.h"
/*
* Print like vprintf().
* Print to current monitor if we have one, else to stdout.
*/
int qemu_vprintf(const char *fmt, va_list ap)
{
if (cur_mon) {
return monitor_vprintf(cur_mon, fmt, ap);
}
return vprintf(fmt, ap);
}
/*
* Print like printf().
* Print to current monitor if we have one, else to stdout.
*/
int qemu_printf(const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = qemu_vprintf(fmt, ap);
va_end(ap);
return ret;
}
/*
* Print like vfprintf()
* Print to @stream if non-null, else to current monitor.
*/
int qemu_vfprintf(FILE *stream, const char *fmt, va_list ap)
{
if (!stream) {
return monitor_vprintf(cur_mon, fmt, ap);
}
return vfprintf(stream, fmt, ap);
}
/*
* Print like fprintf().
* Print to @stream if non-null, else to current monitor.
*/
int qemu_fprintf(FILE *stream, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = qemu_vfprintf(stream, fmt, ap);
va_end(ap);
return ret;
}