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qemu-print: New qemu_fprintf(), qemu_vfprintf()

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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>
This commit is contained in:
Markus Armbruster 2019-04-17 21:18:01 +02:00
parent 11cb6c152a
commit 19aaa4c3fd
2 changed files with 31 additions and 0 deletions
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4
include/qemu/qemu-print.h
View file

@ -16,4 +16,8 @@
int qemu_vprintf(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
int qemu_printf(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
int qemu_vfprintf(FILE *stream, const char *fmt, va_list ap)
GCC_FMT_ATTR(2, 0);
int qemu_fprintf(FILE *stream, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
#endif

27
util/qemu-print.c
View file

@ -40,3 +40,30 @@ int qemu_printf(const char *fmt, ...)
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;
}