[libvirt] [PATCH 2/4 v2] conf: Parse and format disk <wwn>

[Eric Blake]

On 08/31/2012 04:10 AM, Osier Yang wrote:
> Validates the wwn while parsing, error out if it's malformed.
> 
> * src/util/util.h: Declare virValidateWWN
> * src/util/util.c: Implement virValidateWWN
> * src/libvirt_private.syms: Export virValidateWWN.
> * src/conf/domain_conf.h: New member 'wwn' for disk def.
> * src/conf/domain_conf.c: Parse and format disk <wwn>

> +#define WWN_REG_PATTERN    "[0-9a-zA-Z]{16}"
> +bool
> +virValidateWWN(const char *wwn) {
> +    regex_t re;
> +    int err;
> +    char error[100];
> +
> +    if ((err = regcomp(&re, WWN_REG_PATTERN, REG_EXTENDED)) != 0)

Do we really need regcomp() for this?  I'm thinking it's much faster to
just do something like:

for (i = 0; wwn[i]; i++)
    if (!c_isxdigit(wwn[i]))
        break;
if (i != 16 || wwn[i])
    // error, return false;
return true;

-- 
-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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