Re: [Qemu-devel] [ [PATCH 1/2] cutils:change strtosz_suffix_unit function

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 7 Dec 2012 11:49:49 +0800
liguang <lig.fnst@cn.fujitsu.com> wrote:

> if value to be translated is larger than INT64_MAX,
> this function will not be convenient for caller to
> be aware of it, so change a little for this.
> 
> Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
> ---
>  cutils.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/cutils.c b/cutils.c
> index 4f0692f..8905b5e 100644
> --- a/cutils.c
> +++ b/cutils.c
> @@ -219,11 +219,11 @@ static int64_t suffix_mul(char suffix, int64_t unit)
>  int64_t strtosz_suffix_unit(const char *nptr, char **end,
>                              const char default_suffix, int64_t unit)
>  {
> -    int64_t retval = -1;
> +    int64_t retval = -1, mul;
>      char *endptr;
>      unsigned char c;
>      int mul_required = 0;
> -    double val, mul, integral, fraction;
> +    double val, integral, fraction;
>  
>      errno = 0;
>      val = strtod(nptr, &endptr);
> @@ -246,6 +246,7 @@ int64_t strtosz_suffix_unit(const char *nptr, char
> **end, goto fail;
>      }
>      if ((val * mul >= INT64_MAX) || val < 0) {
> +        retval = 0;
Why not to add Error argument to return errors instead of using return value?
That way function would be easier to generalize in future to handle whole
INT64 range. And callers would check only returned error instead of return
value or if 'end' == 0. 

>          goto fail;
>      }
>      retval = val * mul;