[Qemu-devel] [PATCH v3 1/1] qemu-img.c: Clean up handling of image size in img_create()

[Jes.Sorensen@redhat.com]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

This cleans up the handling of image size in img_create() by parsing
the value early, and then only setting it once if a value has been
added as the last argument to the command line.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qemu-img.c |   23 +++++++++++++++++------
 1 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index d146d8c..d9667a2 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -282,6 +282,7 @@ static int add_old_style_options(const char *fmt, QEMUOptionParameter *list,
 static int img_create(int argc, char **argv)
 {
     int c, ret = 0;
+    uint64_t img_size = -1;
     const char *fmt = "raw";
     const char *base_fmt = NULL;
     const char *filename;
@@ -329,6 +330,20 @@ static int img_create(int argc, char **argv)
     }
     filename = argv[optind++];
 
+    /* Get image size, if specified */
+    if (optind < argc) {
+        ssize_t sval;
+        sval = strtosz(argv[optind++], NULL);
+        if (sval < 0) {
+            error("Invalid image size specified! You may use k, M, G or "
+                  "T suffixes for ");
+            error("kilobytes, megabytes, gigabytes and terabytes.");
+            ret = -1;
+            goto out;
+        }
+        img_size = (uint64_t)sval;
+    }
+
     if (options && !strcmp(options, "?")) {
         ret = print_block_option_help(filename, fmt);
         goto out;
@@ -356,7 +371,8 @@ static int img_create(int argc, char **argv)
 
     /* Create parameter list with default values */
     param = parse_option_parameters("", create_options, param);
-    set_option_parameter_int(param, BLOCK_OPT_SIZE, -1);
+
+    set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
 
     /* Parse -o options */
     if (options) {
@@ -368,11 +384,6 @@ static int img_create(int argc, char **argv)
         }
     }
 
-    /* Add size to parameters */
-    if (optind < argc) {
-        set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]);
-    }
-
     /* Add old-style options to parameters */
     ret = add_old_style_options(fmt, param, base_filename, base_fmt);
     if (ret < 0) {
-- 
1.7.3.2