usr: sdk: Add vsnprintf() family helpers

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 21 insertions, 1 deletions

diff --git a/usr/sdk/inc/sdk/string.h b/usr/sdk/inc/sdk/string.h
index 0f7ff27..965f66a 100644
--- a/usr/sdk/inc/sdk/string.h
+++ b/usr/sdk/inc/sdk/string.h
@@ -6,7 +6,8 @@
 #ifndef _SDK_STRING_H_
 #define _SDK_STRING_H_ 1
 
- #include <sdk/types.h>
+#include <sdk/types.h>
+#include <sdk/stdarg.h>
 
 /*
  * Returns the length of a string
@@ -39,4 +40,23 @@ void *memcpy(void *dest, const void *src, USIZE count);
  */
 char *itoa(QUAD value, char *buf, int base);
 
+/*
+ * Write a formatted string to a buffer
+ *
+ * @s: Target buffer
+ * @size: Maximum buffer size
+ * @fmt: Format string
+ * @<...>: Args
+ */
+int snprintf(char *s, USIZE size, const char *fmt, ...);
+
+/*
+ * Write a formatted string to a buffer using a va_list
+ *
+ * @s: Target buffer
+ * @size: Maximum buffer size
+ * @ap: Args pointer
+ */
+int vsnprintf(char *s, USIZE size, const char *fmt, va_list ap);
+
 #endif  /* !_SDK_STRING_H_ */