volatile string fns

1 files changed, 32 insertions, 0 deletions

diff --git a/include/string.h b/include/string.h
index 4d32f57..e376918 100644
--- a/include/string.h
+++ b/include/string.h
@@ -52,6 +52,38 @@ extern void *memmove(void *restrict dest, const void *restrict src, size_t n);
 extern void *memset(void *restrict dest, int c, size_t n);
 
 /**
+ * Copy the first n bytes from memory area src to memory area dest. The memory
+ * areas must not overlap.
+ * @param dest - the destination
+ * @param src - the source
+ * @param n - the byte count
+ * @returns a pointer to dest
+ */
+extern void *memcpyv(volatile void *restrict dest,
+					 const volatile void *restrict src, size_t n);
+
+/**
+ * Copy the first n bytes from memory area src to memory area dest. The memory
+ * areas may overlap; memmove behaves as though the bytes are first copied to a
+ * temporary array.
+ * @param dest - the destination
+ * @param src - the source
+ * @param n - the byte count
+ * @returns a pointer to dest
+ */
+extern void *memmovev(volatile void *restrict dest,
+					  const volatile void *restrict src, size_t n);
+
+/**
+ * Fill the first n bytes of the memory region dest with the constant byte c.
+ * @param dest - the destination
+ * @param c - the byte to write
+ * @param n - the byte count
+ * @returns a pointer to dest
+ */
+extern void *memsetv(volatile void *restrict dest, int c, size_t n);
+
+/**
  * Calculates the length of the string pointed to by str, excluding
  * the terminating null byte
  * @param str - the string pointer