Re: [Qemu-devel] [PATCH v3 03/12] qga: move string split in separate function

["Denis V. Lunev" <den-lists@parallels.com>]

On 08/26/2015 01:05 PM, marcandre.lureau@redhat.com wrote:
> From: Marc-André Lureau <marcandre.lureau@redhat.com>
>
> The function is going to be reused in a later patch.
>
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> ---
>   qga/main.c | 33 ++++++++++++++++++++++-----------
>   1 file changed, 22 insertions(+), 11 deletions(-)
>
> diff --git a/qga/main.c b/qga/main.c
> index 10bb2f7..e75022c 100644
> --- a/qga/main.c
> +++ b/qga/main.c
> @@ -921,6 +921,26 @@ static void ga_print_cmd(QmpCommand *cmd, void *opaque)
>       printf("%s\n", qmp_command_name(cmd));
>   }
>   
> +static GList *split_list(gchar *str, const gchar separator)
> +{
it would be much better to declare this helper as "split_list(const 
gchar *str, ...
and make temporary copy of parameter inside. Without this the function
as NASTY side-effect and trashes the string passed in.

Also it is rather reinvents strtok wheel.

you can also use g_strsplit at your convenience, but may be this is overkill

> +    GList *list = NULL;
> +    int i, j, len;
> +
> +    for (j = 0, i = 0, len = strlen(str); i < len; i++) {
> +        if (str[i] == separator) {
> +            str[i] = 0;
> +            list = g_list_append(list, &str[j]);
> +            j = i + 1;
> +        }
> +    }
> +
> +    if (j < i) {
> +        list = g_list_append(list, &str[j]);
> +    }
> +
> +    return list;
> +}
> +
>   int main(int argc, char **argv)
>   {
>       const char *sopt = "hVvdm:p:l:f:F::b:s:t:";
> @@ -953,7 +973,7 @@ int main(int argc, char **argv)
>           { "statedir", 1, NULL, 't' },
>           { NULL, 0, NULL, 0 }
>       };
> -    int opt_ind = 0, ch, daemonize = 0, i, j, len;
> +    int opt_ind = 0, ch, daemonize = 0;
>       GLogLevelFlags log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
>       GList *blacklist = NULL;
>       GAState *s;
> @@ -1001,16 +1021,7 @@ int main(int argc, char **argv)
>                   qmp_for_each_command(ga_print_cmd, NULL);
>                   exit(EXIT_SUCCESS);
>               }
> -            for (j = 0, i = 0, len = strlen(optarg); i < len; i++) {
> -                if (optarg[i] == ',') {
> -                    optarg[i] = 0;
> -                    blacklist = g_list_append(blacklist, &optarg[j]);
> -                    j = i + 1;
> -                }
> -            }
> -            if (j < i) {
> -                blacklist = g_list_append(blacklist, &optarg[j]);
> -            }
> +            blacklist = g_list_concat(blacklist, split_list(optarg, ','));
>               break;
>           }
>   #ifdef _WIN32