help on how to wrap a C macros when binding linux/spi/spidev.h

[Nicholas Wilson]

On Thursday, 29 March 2018 at 08:47:50 UTC, dangbinghoo wrote:

>  * #define SPI_MSGSIZE(N) \
> 	((((N)*(sizeof (struct spi_ioc_transfer))) < (1 << 
> _IOC_SIZEBITS)) \
> 		? ((N)*(sizeof (struct spi_ioc_transfer))) : 0)
>  */
> extern (D) size_t SPI_MSGSIZE(size_t N)
> {
>     return ((N * (spi_ioc_transfer.sizeof)) < (1 << 
> _IOC_SIZEBITS)) ? (N * (spi_ioc_transfer.sizeof)) : 0;
> }
>
> /* #define SPI_IOC_MESSAGE(N) _IOW(SPI_IOC_MAGIC, 0, 
> char[SPI_MSGSIZE(N)]) */
> extern (D) auto SPI_IOC_MESSAGE(size_t N)
> {
>     size_t n = SPI_MSGSIZE(N);
>     return _IOW!(char[static n])(SPI_IOC_MAGIC, 0);
>     //mixin("return _IOW!(char[n])(SPI_IOC_MAGIC, 0);");
> }
> ```
>

try

> extern (D) auto SPI_IOC_MESSAGE(size_t N)()
> {
>     enum n = SPI_MSGSIZE(N);
>     return _IOW!(char[n])(SPI_IOC_MAGIC, 0);
>     //mixin("return _IOW!(char[n])(SPI_IOC_MAGIC, 0);");
> }