Implement debug console device

libdebugconsole/debugconsole.c

@@ -0,0 +1,30 @@
+#include <debugconsole.h>
+#include <devices.h>
+#include <liballoc.h>
+#include <printf.h>
+#include <stddef.h>
+#include <system.h>
+
+int debugconsole_print (const char* string, size_t len) {
+  return device_do ("DEBUGCONSOLE", DEBUGCONSOLE_PUTSTR, (void*)string, (void*)&len, NULL, NULL);
+}
+
+void debug_printf (const char* fmt, ...) {
+  va_list args;
+  va_start (args, fmt);
+
+  char* buf = malloc (DEBUG_PRINTF_MAX);
+
+  if (buf == NULL) {
+    va_end (args);
+    return;
+  }
+
+  buf[0] = '\0';
+  int len = vsnprintf (buf, DEBUG_PRINTF_MAX, fmt, args);
+
+  va_end (args);
+
+  debugconsole_print (buf, len);
+  free (buf);
+}