Re: [PATCH 1/2] util/cutils: Turn FIXME comment into QEMU_BUILD_BUG_ON()

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 11/25/19 2:38 PM, Markus Armbruster wrote:
> qemu_strtoi64() assumes int64_t is long long.  This is marked FIXME.
> Replace by a QEMU_BUILD_BUG_ON() to avoid surprises.
> 
> Same for qemu_strtou64().
> 
> Fix a typo in qemu_strtoul()'s contract while there.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>   util/cutils.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/util/cutils.c b/util/cutils.c
> index fd591cadf0..b372dd3e68 100644
> --- a/util/cutils.c
> +++ b/util/cutils.c
> @@ -502,7 +502,7 @@ int qemu_strtoul(const char *nptr, const char **endptr, int base,
>    * Convert string @nptr to an int64_t.
>    *
>    * Works like qemu_strtol(), except it stores INT64_MAX on overflow,
> - * and INT_MIN on underflow.
> + * and INT64_MIN on underflow.
>    */
>   int qemu_strtoi64(const char *nptr, const char **endptr, int base,
>                    int64_t *result)
> @@ -517,8 +517,9 @@ int qemu_strtoi64(const char *nptr, const char **endptr, int base,
>           return -EINVAL;
>       }
>   
> +    /* This assumes int64_t is long long TODO relax */
> +    QEMU_BUILD_BUG_ON(sizeof(int64_t) != sizeof(long long));

Ready for 128-bit!
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

>       errno = 0;
> -    /* FIXME This assumes int64_t is long long */
>       *result = strtoll(nptr, &ep, base);
>       return check_strtox_error(nptr, ep, endptr, errno);
>   }
> @@ -541,8 +542,9 @@ int qemu_strtou64(const char *nptr, const char **endptr, int base,
>           return -EINVAL;
>       }
>   
> +    /* This assumes uint64_t is unsigned long long TODO relax */
> +    QEMU_BUILD_BUG_ON(sizeof(uint64_t) != sizeof(unsigned long long));
>       errno = 0;
> -    /* FIXME This assumes uint64_t is unsigned long long */
>       *result = strtoull(nptr, &ep, base);
>       /* Windows returns 1 for negative out-of-range values.  */
>       if (errno == ERANGE) {
>