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qemu-img: sort block formats in help message

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The help message for qemu-img lists the supported block formats, of
which there are 27 as of version 2.0.50. The formats are printed in
the order of their driver's position in a linked list, which appears
random. This patch prints the formats in sorted order, making it
easier to read and to find a specific format in the list.

[Added suggestions from Fam Zheng <famz@redhat.com> to declare variables
at the top of the scope in help() and to omit explicit cast for void*
opaque.
--Stefan]

Signed-off-by: Mike Day <ncmike@ncultra.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Mike Day 2014-05-05 12:53:34 -04:00 committed by Stefan Hajnoczi
parent f915db07ef
commit 1a443c1b8b
1 changed files with 25 additions and 3 deletions
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28
qemu-img.c
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@ -32,6 +32,7 @@
#include "block/block_int.h"
#include "block/qapi.h"
#include <getopt.h>
#include <glib.h>
#define QEMU_IMG_VERSION "qemu-img version " QEMU_VERSION \
", Copyright (c) 2004-2008 Fabrice Bellard\n"
@ -55,9 +56,25 @@ typedef enum OutputFormat {
#define BDRV_O_FLAGS BDRV_O_CACHE_WB
#define BDRV_DEFAULT_CACHE "writeback"
static void format_print(void *opaque, const char *name)
static gint compare_data(gconstpointer a, gconstpointer b, gpointer user)
{
printf(" %s", name);
return g_strcmp0(a, b);
}
static void print_format(gpointer data, gpointer user)
{
printf(" %s", (char *)data);
}
static void add_format_to_seq(void *opaque, const char *fmt_name)
{
GSequence *seq = opaque;
if (!g_sequence_lookup(seq, (gpointer)fmt_name,
compare_data, NULL)) {
g_sequence_insert_sorted(seq, (gpointer)fmt_name,
compare_data, NULL);
}
}
static void QEMU_NORETURN GCC_FMT_ATTR(1, 2) error_exit(const char *fmt, ...)
@ -142,10 +159,15 @@ static void QEMU_NORETURN help(void)
" '-f' first image format\n"
" '-F' second image format\n"
" '-s' run in Strict mode - fail on different image size or sector allocation\n";
GSequence *seq;
printf("%s\nSupported formats:", help_msg);
bdrv_iterate_format(format_print, NULL);
seq = g_sequence_new(NULL);
bdrv_iterate_format(add_format_to_seq, seq);
g_sequence_foreach(seq, print_format, NULL);
printf("\n");
g_sequence_free(seq);
exit(EXIT_SUCCESS);
}