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block: sort formats alphabetically in bdrv_iterate_format() 

Format names are best consumed in alphabetical order.  This makes
human-readable output easy to produce.

bdrv_iterate_format() already has an array of format strings.  Sort them
before invoking the iteration callback.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Benoît Canet <benoit.canet@nodalink.com>
This commit is contained in:
Stefan Hajnoczi 2014-08-27 12:08:55 +01:00
parent 6d0de8eb21
commit ada4240103
1 changed files with 13 additions and 1 deletions
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14
block.c
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@ -3744,11 +3744,17 @@ const char *bdrv_get_format_name(BlockDriverState *bs)
return bs->drv ? bs->drv->format_name : NULL;
}
static int qsort_strcmp(const void *a, const void *b)
{
return strcmp(a, b);
}
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
void *opaque)
{
BlockDriver *drv;
int count = 0;
int i;
const char **formats = NULL;
QLIST_FOREACH(drv, &bdrv_drivers, list) {
@ -3762,10 +3768,16 @@ void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
if (!found) {
formats = g_renew(const char *, formats, count + 1);
formats[count++] = drv->format_name;
it(opaque, drv->format_name);
}
}
}
qsort(formats, count, sizeof(formats[0]), qsort_strcmp);
for (i = 0; i < count; i++) {
it(opaque, formats[i]);
}
g_free(formats);
}