#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <xds.h>

static void error_exit(int rc, const char* msg, ...)
    {
    va_list args;
    va_start(args, msg);
    vfprintf(stderr, msg, args);
    va_end(args);
    exit(rc);
    }

int main()
    {
    xds_t* xds;
    char*  buffer;
    size_t buffer_size;

    xds_int32_t  int32  = -42;
    xds_uint32_t uint32 = 0x12345678;
    const char*  string = "This is a test.";

    xds = xds_init(XDS_ENCODE);
    if (xds == NULL)
	error_exit(1, "Failed to initialize XDS context: %s\n", strerror(errno));

    if (xds_register(xds, "int32",  &xdr_encode_int32, NULL) != XDS_OK ||
	xds_register(xds, "uint32", &xdr_encode_uint32, NULL) != XDS_OK ||
	xds_register(xds, "string", &xdr_encode_string, NULL) != XDS_OK)
	error_exit(1, "Failed to register my encoding engines!\n");

    if (xds_encode(xds, "int32 uint32 string", int32, uint32, string) != XDS_OK)
	error_exit(1, "xds_encode() failed!\n");

    if (xds_getbuffer(xds, XDS_GIFT, (void**)&buffer, &buffer_size) != XDS_OK)
	error_exit(1, "getbuffer() failed.\n");

    xds_destroy(xds);

    write(STDOUT_FILENO, buffer, buffer_size);

    free(buffer);

    fprintf(stderr, "Encoded data:\n");
    fprintf(stderr, "\tint32   = %d\n", int32);
    fprintf(stderr, "\tuint32 = 0x%x\n", uint32);
    fprintf(stderr, "\tstring = \"%s\"\n", string);

    return 0;
    }