Re: [PATCH v2 11/11] tests/9pfs: add local Tmkdir test

["Daniel P. Berrangé" <berrange@redhat.com>]

On Fri, Oct 02, 2020 at 01:51:54PM +0200, Christian Schoenebeck wrote:
> This test case uses the 9pfs 'local' driver to create a directory
> and then checks if the expected directory was actually created
> (as real directory) on host side.
> 
> Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
> ---
>  tests/qtest/virtio-9p-test.c | 139 +++++++++++++++++++++++++++++++++++
>  1 file changed, 139 insertions(+)
> 
> diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
> index af7e169d3a..93161a4b35 100644
> --- a/tests/qtest/virtio-9p-test.c
> +++ b/tests/qtest/virtio-9p-test.c
> @@ -18,6 +18,62 @@
>  #define QVIRTIO_9P_TIMEOUT_US (10 * 1000 * 1000)
>  static QGuestAllocator *alloc;
>  
> +/*
> + * Used to auto generate new fids. Start with arbitrary high value to avoid
> + * collision with hard coded fids in basic test code.
> + */
> +static uint32_t fid_generator = 1000;
> +
> +static uint32_t genfid(void)
> +{
> +    return fid_generator++;
> +}
> +
> +/**
> + * Splits the @a in string by @a delim into individual (non empty) strings
> + * and outputs them to @a out. The output array @a out is NULL terminated.
> + *
> + * Output array @a out must be freed by calling split_free().
> + *
> + * @returns number of individual elements in output array @a out (without the
> + *          final NULL terminating element)
> + */
> +static int split(const char *in, const char *delim, char ***out)
> +{
> +    int n = 0, i = 0;
> +    char *tmp, *p;
> +
> +    tmp = g_strdup(in);
> +    for (p = strtok(tmp, delim); p != NULL; p = strtok(NULL, delim)) {
> +        if (strlen(p) > 0) {
> +            ++n;
> +        }
> +    }
> +    g_free(tmp);
> +
> +    *out = g_malloc0(n * sizeof(char *) + 1); /* last element NULL delimiter */

Surely this should be  (n + 1) * sizeof(char *), because the last
element still needs to be large enough to hold a pointer, not a
single extra byte.

> +
> +    tmp = g_strdup(in);
> +    for (p = strtok(tmp, delim); p != NULL; p = strtok(NULL, delim)) {
> +        if (strlen(p) > 0) {
> +            (*out)[i++] = g_strdup(p);
> +        }
> +    }
> +    g_free(tmp);
> +
> +    return n;
> +}

This seems to largely re-invent g_strsplit 

https://developer.gnome.org/glib/2.62/glib-String-Utility-Functions.html#g-strsplit

> +
> +static void split_free(char ***out)
> +{
> +    int i;
> +    for (i = 0; (*out)[i]; ++i) {
> +        g_free((*out)[i]);
> +    }
> +    g_free(*out);
> +    *out = NULL;
> +}

And g_strfreev



Regards,
Daniel
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