cutils: Adjust signature of parse_uint[_full]

It's already confusing that we have two very similar functions for
wrapping the parse of a 64-bit unsigned value, differing mainly on
whether they permit leading '-'.  Adjust the signature of parse_uint()
and parse_uint_full() to be like all of qemu_strto*(): put the result
parameter last, use the same types (uint64_t and unsigned long long
have the same width, but are not always the same type), and mark
endptr const (this latter change only affects the rare caller of
parse_uint).  Adjust all callers in the tree.

While at it, note that since cutils.c already includes:

    QEMU_BUILD_BUG_ON(sizeof(int64_t) != sizeof(long long));

we are guaranteed that the result of parse_uint* cannot exceed
UINT64_MAX (or the build would have failed), so we can drop
pre-existing dead comparisons in opts-visitor.c that were never false.

Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20230522190441.64278-8-eblake@redhat.com>
[eblake: Drop dead code spotted by Markus]
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/contrib/ivshmem-server/main.c b/contrib/ivshmem-server/main.c
index 224dbeb547..5901f17707 100644
--- a/contrib/ivshmem-server/main.c
+++ b/contrib/ivshmem-server/main.c
@@ -69,7 +69,7 @@ static void
 ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[])
 {
     int c;
-    unsigned long long v;
+    uint64_t v;
     Error *err = NULL;
 
     while ((c = getopt(argc, argv, "hvFp:S:m:M:l:n:")) != -1) {
@@ -112,7 +112,7 @@ ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[])
             break;
 
         case 'n': /* number of vectors */
-            if (parse_uint_full(optarg, &v, 0) < 0) {
+            if (parse_uint_full(optarg, 0, &v) < 0) {
                 fprintf(stderr, "cannot parse n_vectors\n");
                 ivshmem_server_help(argv[0]);
                 exit(1);