cutils: Use parse_uint in qemu_strtosz for negative rejection

Rather than open-coding two different ways to check for an unwanted
negative sign, reuse the same code in both functions.  That way, if we
decide down the road to accept "-0" instead of rejecting it, we have
fewer places to change.  Also, it means we now get ERANGE instead of
EINVAL for negative values in qemu_strtosz, which is reasonable for
what it represents.  This in turn changes the expected output of a
couple of iotests.

The change is not quite complete: negative fractional scaled values
can trip us up.  This will be fixed in a later patch addressing other
issues with fractional scaled values.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20230522190441.64278-18-eblake@redhat.com>

4 files changed, 7 insertions, 13 deletions

diff --git a/tests/qemu-iotests/049.out b/tests/qemu-iotests/049.out
index 8719c91b48..34e1b452e6 100644
--- a/tests/qemu-iotests/049.out
+++ b/tests/qemu-iotests/049.out
@@ -92,13 +92,10 @@ Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off comp
 == 3. Invalid sizes ==
 
 qemu-img create -f qcow2 TEST_DIR/t.qcow2 -- -1024
-qemu-img: Invalid image size specified. You may use k, M, G, T, P or E suffixes for
-qemu-img: kilobytes, megabytes, gigabytes, terabytes, petabytes and exabytes.
+qemu-img: Invalid image size specified. Must be between 0 and 9223372036854775807.
 
 qemu-img create -f qcow2 -o size=-1024 TEST_DIR/t.qcow2
-qemu-img: TEST_DIR/t.qcow2: Parameter 'size' expects a non-negative number below 2^64
-Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
-and exabytes, respectively.
+qemu-img: TEST_DIR/t.qcow2: Value '-1024' is out of range for parameter 'size'
 
 qemu-img create -f qcow2 TEST_DIR/t.qcow2 -- -1k
 qemu-img: Invalid image size specified. You may use k, M, G, T, P or E suffixes for
diff --git a/tests/qemu-iotests/178.out.qcow2 b/tests/qemu-iotests/178.out.qcow2
index 0d51fe401e..fe193fd5f4 100644
--- a/tests/qemu-iotests/178.out.qcow2
+++ b/tests/qemu-iotests/178.out.qcow2
@@ -13,8 +13,7 @@ qemu-img: Invalid option list: ,
 qemu-img: Invalid parameter 'snapshot.foo'
 qemu-img: Failed in parsing snapshot param 'snapshot.foo=bar'
 qemu-img: --output must be used with human or json as argument.
-qemu-img: Invalid image size specified. You may use k, M, G, T, P or E suffixes for
-qemu-img: kilobytes, megabytes, gigabytes, terabytes, petabytes and exabytes.
+qemu-img: Invalid image size specified. Must be between 0 and 9223372036854775807.
 qemu-img: Unknown file format 'foo'
 
 == Size calculation for a new file (human) ==
diff --git a/tests/qemu-iotests/178.out.raw b/tests/qemu-iotests/178.out.raw
index 116241ddef..445e460fad 100644
--- a/tests/qemu-iotests/178.out.raw
+++ b/tests/qemu-iotests/178.out.raw
@@ -13,8 +13,7 @@ qemu-img: Invalid option list: ,
 qemu-img: Invalid parameter 'snapshot.foo'
 qemu-img: Failed in parsing snapshot param 'snapshot.foo=bar'
 qemu-img: --output must be used with human or json as argument.
-qemu-img: Invalid image size specified. You may use k, M, G, T, P or E suffixes for
-qemu-img: kilobytes, megabytes, gigabytes, terabytes, petabytes and exabytes.
+qemu-img: Invalid image size specified. Must be between 0 and 9223372036854775807.
 qemu-img: Unknown file format 'foo'
 
 == Size calculation for a new file (human) ==
diff --git a/tests/unit/test-cutils.c b/tests/unit/test-cutils.c
index cfe1fc8a17..0e3215a46e 100644
--- a/tests/unit/test-cutils.c
+++ b/tests/unit/test-cutils.c
@@ -3519,10 +3519,9 @@ static void test_qemu_strtosz_trailing(void)
 static void test_qemu_strtosz_erange(void)
 {
     /* FIXME negative values fit better as ERANGE */
-    do_strtosz(" -0", -EINVAL /* FIXME -ERANGE */, 0, 0 /* FIXME 3 */);
-    do_strtosz("-1", -EINVAL /* FIXME -ERANGE */, 0, 0 /* FIXME 2 */);
-    do_strtosz_full("-2M", qemu_strtosz, -EINVAL /* FIXME -ERANGE */, 0,
-                    0 /* FIXME 2 */, -EINVAL, 0);
+    do_strtosz(" -0", -ERANGE, 0, 3);
+    do_strtosz("-1", -ERANGE, 0, 2);
+    do_strtosz_full("-2M", qemu_strtosz, -ERANGE, 0, 2, -EINVAL, 0);
     do_strtosz(" -.0", -EINVAL /* FIXME -ERANGE */, 0, 0 /* FIXME 4 */);
     do_strtosz_full("-.1k", qemu_strtosz, -EINVAL /* FIXME -ERANGE */, 0,
                     0 /* FIXME 3 */, -EINVAL, 0);