[libvirt] [PATCH 08/10] util: error: Use a more declarative approach in virErrorMsg

[Daniel P. Berrangé]

On Wed, Dec 05, 2018 at 05:47:49PM +0100, Peter Krempa wrote:
> Use a macro to declare how the strings for individual error codes. This
> unifies the used condition and will allow simplifying the code further.
> 
> Signed-off-by: Peter Krempa <pkrempa at redhat.com>
> ---
>  src/libvirt_private.syms |   1 +
>  src/util/virerror.c      | 792 +++++++++------------------------------
>  src/util/virerrorpriv.h  |   8 +
>  3 files changed, 188 insertions(+), 613 deletions(-)
> 
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index 6184030d59..775b33e151 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -1753,6 +1753,7 @@ virDispatchError;
>  virErrorCopyNew;
>  virErrorInitialize;
>  virErrorMsg;
> +virErrorMsgStrings;
>  virErrorPreserveLast;
>  virErrorRestore;
>  virErrorSetErrnoFromLastError;
> diff --git a/src/util/virerror.c b/src/util/virerror.c
> index 7444d671bb..d3cd06331f 100644
> --- a/src/util/virerror.c
> +++ b/src/util/virerror.c
> @@ -903,6 +903,178 @@ void virRaiseErrorObject(const char *filename,
>  }
> 
> 
> +const virErrorMsgTuple virErrorMsgStrings[VIR_ERR_NUMBER_LAST] = {
> +    { VIR_ERR_OK, NULL, NULL },
> +    { VIR_ERR_INTERNAL_ERROR, "internal error", "internal error: %s" },
> +    { VIR_ERR_NO_MEMORY, "out of memory", "out of memory: %s" },
> +    { VIR_ERR_NO_SUPPORT,
> +        "this function is not supported by the connection driver",
> +        "this function is not supported by the connection driver: %s" },

The vast majority of messages have identical text apart from a small
suffix. How about using a macro to kill the duplication in the source
eg

 #define MSG(msg, suffix) \
      msg, msg # suffix

  { VIR_ERR_NO_SUPPORT,
    MSG("this function is not supported by the connection driver", ": %s") },

Then, only a handful will need separate entries 


Regards,
Daniel
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