[libvirt] [PATCH 3/7] util: json: Use virBuffer in JSON->string conversion

Laine Stump laine at laine.org
Wed Apr 3 00:23:56 UTC 2019


On 3/29/19 9:33 AM, Peter Krempa wrote:
> The last step of the conversion involves copying of the generated JSON
> into a separate string. We can use a virBuffer to do this as this will
> also allow to subsequently use the buffer when we actually need to do
> some other formatting of the string.
>
> Signed-off-by: Peter Krempa <pkrempa at redhat.com>


Reviewed-by: Laine Stump <laine at laine.org>


(by itself it's pointless to convert. But of course in patch 7 you're 
using the ToBuffer function separately)


> ---
>   src/util/virjson.c | 38 +++++++++++++++++++++++++++++---------
>   1 file changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/src/util/virjson.c b/src/util/virjson.c
> index d5d66f879f..7dfc589944 100644
> --- a/src/util/virjson.c
> +++ b/src/util/virjson.c
> @@ -28,6 +28,7 @@
>   #include "virlog.h"
>   #include "virstring.h"
>   #include "virutil.h"
> +#include "virbuffer.h"
>
>   #if WITH_YAJL
>   # include <yajl/yajl_gen.h>
> @@ -1969,17 +1970,18 @@ virJSONValueToStringOne(virJSONValuePtr object,
>   }
>
>
> -char *
> -virJSONValueToString(virJSONValuePtr object,
> +static int
> +virJSONValueToBuffer(virJSONValuePtr object,
> +                     virBufferPtr buf,
>                        bool pretty)
>   {
>       yajl_gen g;
>       const unsigned char *str;
> -    char *ret = NULL;
>       yajl_size_t len;
>   # ifndef WITH_YAJL2
>       yajl_gen_config conf = { pretty ? 1 : 0, pretty ? "  " : " "};
>   # endif
> +    int ret = -1;
>
>       VIR_DEBUG("object=%p", object);
>
> @@ -2009,13 +2011,12 @@ virJSONValueToString(virJSONValuePtr object,
>           goto cleanup;
>       }
>
> -    ignore_value(VIR_STRDUP(ret, (const char *)str));
> +    virBufferAdd(buf, (const char *) str, len);
> +    ret = 0;
>
>    cleanup:
>       yajl_gen_free(g);
>
> -    VIR_DEBUG("result=%s", NULLSTR(ret));
> -
>       return ret;
>   }
>
> @@ -2030,17 +2031,36 @@ virJSONValueFromString(const char *jsonstring ATTRIBUTE_UNUSED)
>   }
>
>
> -char *
> -virJSONValueToString(virJSONValuePtr object ATTRIBUTE_UNUSED,
> +static int
> +virJSONValueToBuffer(virJSONValuePtr object ATTRIBUTE_UNUSED,
> +                     virBufferPtr buf ATTRIBUTE_UNUSED,
>                        bool pretty ATTRIBUTE_UNUSED)
>   {
>       virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
>                      _("No JSON parser implementation is available"));
> -    return NULL;
> +    return -1;
>   }
>   #endif
>
>
> +char *
> +virJSONValueToString(virJSONValuePtr object,
> +                     bool pretty)
> +{
> +    VIR_AUTOCLEAN(virBuffer) buf = VIR_BUFFER_INITIALIZER;
> +    char *ret = NULL;
> +
> +    if (virJSONValueToBuffer(object, &buf, pretty) < 0)
> +        return NULL;
> +
> +    ret = virBufferContentAndReset(&buf);
> +
> +    VIR_DEBUG("result=%s", NULLSTR(ret));
> +
> +    return ret;
> +}
> +
> +
>   /**
>    * virJSONStringReformat:
>    * @jsonstr: string to reformat





More information about the libvir-list mailing list