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cutils: Adjust signature of parse_uint[_full]

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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>
This commit is contained in:
Eric Blake 2023-05-22 14:04:29 -05:00
parent 84760bbca9
commit bd1386cce1
12 changed files with 86 additions and 101 deletions
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13
util/cutils.c
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@ -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;
}