#include <talloc.h>

main () {
	const char *dc_name = NULL;
	char *dc_unc = NULL;
	TALLOC_CTX *mem_ctx = NULL;
	mem_ctx = talloc_new(NULL);

	dc_name = "mydc.foobar.local";

	printf("Wrong: ");
	dc_unc = talloc_asprintf(mem_ctx, "%s%s",
	dc_name[0] == '\\'? "\\\\":"",
	talloc_strdup(mem_ctx, dc_name));

	printf("dc_name: %s\t=> ", dc_name);
	printf("dc_unc: %s\n", dc_unc);

	printf("Right: ");
	dc_unc = talloc_asprintf(mem_ctx, "%s%s",
	dc_name[0] != '\\'? "\\\\":"",
	talloc_strdup(mem_ctx, dc_name));

	printf("dc_name: %s\t=> ", dc_name);
	printf("dc_unc: %s\n", dc_unc);

	dc_name = "\\\\mydc.foobar.local";

	printf("Wrong: ");
	dc_unc = talloc_asprintf(mem_ctx, "%s%s",
	dc_name[0] == '\\'? "\\\\":"",
	talloc_strdup(mem_ctx, dc_name));

	printf("dc_name: %s\t=> ", dc_name);
	printf("dc_unc: %s\n", dc_unc);

	printf("Right: ");
	dc_unc = talloc_asprintf(mem_ctx, "%s%s",
	dc_name[0] != '\\'? "\\\\":"",
	talloc_strdup(mem_ctx, dc_name));

	printf("dc_name: %s\t=> ", dc_name);
	printf("dc_unc: %s\n", dc_unc);

	talloc_free(mem_ctx);
}