Add a simple dprintf() implementation for systems that do not have it

noice.c

@@ -10,6 +10,7 @@
 #include <limits.h>
 #include <locale.h>
 #include <regex.h>
+#include <stdarg.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <signal.h>
@@ -90,6 +91,22 @@ void printwarn(void);
 void printerr(int ret, char *prefix);
 char *makepath(char *dir, char *name);
 
+#undef dprintf
+int
+dprintf(int fd, const char *fmt, ...)
+{
+	char buf[BUFSIZ];
+	int r;
+	va_list ap;
+
+	va_start(ap, fmt);
+	r = vsnprintf(buf, sizeof(buf), fmt, ap);
+	if (r > 0)
+		write(fd, buf, r);
+	va_end(ap);
+	return r;
+}
+
 void *
 xmalloc(size_t size)
 {