1 files changed, 91 insertions, 0 deletions
diff --git a/kernel/include/lib/kio.h b/kernel/include/lib/kio.h
new file mode 100644
index 0000000..652a85b
--- /dev/null
+++ b/kernel/include/lib/kio.h
@@ -0,0 +1,91 @@
+/**
+ * @file kio.h
+ *
+ * @author Freya Murphy <freya@freyacat.org>
+ *
+ * Kernel I/O definitions.
+ */
+
+#ifndef _KIO_H
+#define _KIO_H
+
+#include <stddef.h>
+#include <stdarg.h>
+
+/**
+ * Prints out a char
+ *
+ * @param c - the char
+ */
+void kputc(char c);
+
+/**
+ * Prints out a null terminated string
+ *
+ * @param s - the string
+ */
+void kputs(const char *s);
+
+/**
+ * prints out a formatted string
+ *
+ * @param format - the format string
+ * @param ... - variable args for the format
+ */
+__attribute__((format(printf, 1, 2))) void kprintf(const char *format, ...);
+
+/**
+ * prints out a formatted string to a buffer
+ *
+ * @param s - the string to write to
+ * @param format - the format string
+ * @param ... - variable args for the format
+ * @returns number of bytes written
+ */
+__attribute__((format(printf, 2, 3))) size_t ksprintf(char *restrict s,
+													  const char *format, ...);
+
+/**
+ * prints out a formatted string to a buffer with a given max length
+ *
+ * @param s - the string to write to
+ * @param maxlen - the max len of the buffer
+ * @param format - the format string
+ * @param ... - variable args for the format
+ * @returns number of bytes written
+ */
+__attribute__((format(printf, 3, 4))) size_t ksnprintf(char *restrict s,
+													   size_t maxlen,
+													   const char *format, ...);
+
+/**
+ * prints out a formatted string
+ *
+ * @param format - the format string
+ * @param args - variable arg list for the format
+ */
+void kvprintf(const char *format, va_list args);
+
+/**
+ * prints out a formatted string to a buffer
+ *
+ * @param s - the string to write to
+ * @param format - the format string
+ * @param args - variable arg list for the format
+ * @returns number of bytes written
+ */
+size_t kvsprintf(char *restrict s, const char *format, va_list args);
+
+/**
+ * prints out a formatted string to a buffer with a given max length
+ *
+ * @param s - the string to write to
+ * @param maxlen - the max len of the buffer
+ * @param format - the format string
+ * @param args - variable arg list for the format
+ * @returns number of bytes written
+ */
+size_t kvsnprintf(char *restrict s, size_t maxlen, const char *format,
+				  va_list args);
+
+#endif /* kio.h */