#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[1024];
    size_t buffer_len;
    int rc;

    xds_int32_t  int32;
    xds_uint32_t uint32;
    char*        string;

    buffer_len = 0;
    do
	{
	rc = read(STDIN_FILENO, buffer + buffer_len, sizeof(buffer) - buffer_len);
	if (rc < 0)
	    error_exit(1, "read() failed: %s\n", strerror(errno));
	else if (rc > 0)
	    buffer_len += rc;
	}
    while (rc > 0 && buffer_len < sizeof(buffer));

    if (buffer_len >= sizeof(buffer))
	error_exit(1, "Too much input data for our buffer.\n");

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

    if (xds_register(xds, "int32",  &xdr_decode_int32, NULL) != XDS_OK ||
	xds_register(xds, "uint32", &xdr_decode_uint32, NULL) != XDS_OK ||
	xds_register(xds, "string", &xdr_decode_string, NULL) != XDS_OK)
	error_exit(1, "Failed to register my decoding engines!\n");

    if (xds_setbuffer(xds, XDS_LOAN, buffer, buffer_len) != XDS_OK)
	error_exit(1, "setbuffer() failed.\n");

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

    xds_destroy(xds);

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

    free(string);

    return 0;
    }