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diff --git a/src/lib/stdio.h b/src/lib/stdio.h
new file mode 100644
index 0000000..7141387
--- /dev/null
+++ b/src/lib/stdio.h
@@ -0,0 +1,30 @@
+#ifndef LIB_STDIO_H
+#define LIB_STDIO_H
+
+#include <debug.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdarg.h>
+
+/* Standard functions. */
+int vsnprintf (char *, size_t, const char *, va_list) PRINTF_FORMAT (3, 0);
+int snprintf (char *, size_t, const char *, ...) PRINTF_FORMAT (3, 4);
+int vprintf (const char *, va_list) PRINTF_FORMAT (1, 0);
+int printf (const char *, ...) PRINTF_FORMAT (1, 2);
+int putchar (int);
+int puts (const char *);
+
+/* Nonstandard functions. */
+void hex_dump (const void *, size_t size, bool ascii);
+
+/* Internal functions. */
+void __vprintf (const char *format, va_list args,
+                void (*output) (char, void *), void *aux);
+void __printf (const char *format,
+               void (*output) (char, void *), void *aux, ...);
+
+/* Try to be helpful. */
+#define sprintf dont_use_sprintf_use_snprintf
+#define vsprintf dont_use_vsprintf_use_vsnprintf
+
+#endif /* lib/stdio.h */