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>

3 files changed, 13 insertions, 14 deletions

diff --git a/util/cutils.c b/util/cutils.c
index 36c14b7..0e279a5 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -722,10 +722,10 @@ const char *qemu_strchrnul(const char *s, int c)
  * parse_uint:
  *
  * @s: String to parse
- * @value: Destination for parsed integer value
  * @endptr: Destination for pointer to first character not consumed, must
  * not be %NULL
  * @base: integer base, between 2 and 36 inclusive, or 0
+ * @value: Destination for parsed integer value
  *
  * Parse unsigned integer
  *
@@ -748,8 +748,7 @@ const char *qemu_strchrnul(const char *s, int c)
  *
  * Else, set *@value to the parsed integer, and return 0.
  */
-int parse_uint(const char *s, unsigned long long *value, char **endptr,
-               int base)
+int parse_uint(const char *s, const char **endptr, int base, uint64_t *value)
 {
     int r = 0;
     char *endp = (char *)s;
@@ -793,8 +792,8 @@ out:
  * parse_uint_full:
  *
  * @s: String to parse
- * @value: Destination for parsed integer value
  * @base: integer base, between 2 and 36 inclusive, or 0
+ * @value: Destination for parsed integer value
  *
  * Parse unsigned integer from entire string
  *
@@ -803,12 +802,12 @@ out:
  * characters are present after a non-overflowing parsed number, the
  * function will return -EINVAL, and *@v will be set to 0.
  */
-int parse_uint_full(const char *s, unsigned long long *value, int base)
+int parse_uint_full(const char *s, int base, uint64_t *value)
 {
-    char *endp;
+    const char *endp;
     int r;
 
-    r = parse_uint(s, value, &endp, base);
+    r = parse_uint(s, &endp, base, value);
     if (r < 0) {
         return r;
     }
diff --git a/util/guest-random.c b/util/guest-random.c
index a24d276..9465dda 100644
--- a/util/guest-random.c
+++ b/util/guest-random.c
@@ -89,8 +89,8 @@ void qemu_guest_random_seed_thread_part2(uint64_t seed)
 
 int qemu_guest_random_seed_main(const char *optarg, Error **errp)
 {
-    unsigned long long seed;
-    if (parse_uint_full(optarg, &seed, 0)) {
+    uint64_t seed;
+    if (parse_uint_full(optarg, 0, &seed)) {
         error_setg(errp, "Invalid seed number: %s", optarg);
         return -1;
     } else {
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index c06a4dc..892d33f 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -249,12 +249,12 @@ static int inet_listen_saddr(InetSocketAddress *saddr,
 
     /* lookup */
     if (port_offset) {
-        unsigned long long baseport;
+        uint64_t baseport;
         if (strlen(port) == 0) {
             error_setg(errp, "port not specified");
             return -1;
         }
-        if (parse_uint_full(port, &baseport, 10) < 0) {
+        if (parse_uint_full(port, 10, &baseport) < 0) {
             error_setg(errp, "can't convert to a number: %s", port);
             return -1;
         }
@@ -732,19 +732,19 @@ static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
                                           struct sockaddr_vm *svm,
                                           Error **errp)
 {
-    unsigned long long val;
+    uint64_t val;
 
     memset(svm, 0, sizeof(*svm));
     svm->svm_family = AF_VSOCK;
 
-    if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
+    if (parse_uint_full(vaddr->cid, 10, &val) < 0 ||
         val > UINT32_MAX) {
         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
         return false;
     }
     svm->svm_cid = val;
 
-    if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
+    if (parse_uint_full(vaddr->port, 10, &val) < 0 ||
         val > UINT32_MAX) {
         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
         return false;