usr: sdk: Add memset() function

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

2 files changed, 31 insertions, 0 deletions

diff --git a/usr/sdk/common/string/memset.c b/usr/sdk/common/string/memset.c
new file mode 100644
index 0000000..ac0b4a2
--- /dev/null
+++ b/usr/sdk/common/string/memset.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025, Ian Moffett.
+ * Provided under the BSD-3 clause.
+ */
+
+#include <sdk/string.h>
+
+void *
+memset(void *s, int c, USIZE n)
+{
+    if (s == NULL) {
+        return NULL;
+    }
+
+    for (USIZE i = 0; i < n; ++i) {
+        ((BYTE *)s)[i] = c;
+    }
+
+    return s;
+}
diff --git a/usr/sdk/inc/sdk/string.h b/usr/sdk/inc/sdk/string.h
index 9e648d9..7233c50 100644
--- a/usr/sdk/inc/sdk/string.h
+++ b/usr/sdk/inc/sdk/string.h
@@ -29,6 +29,17 @@ USIZE strlen(const char *str);
 void *memcpy(void *dest, const void *src, USIZE count);
 
 /*
+ * Fill a memory area with a number of bytes
+ *
+ * @s: Target memory area
+ * @c: Bytes to fill with
+ * @n: Number of bytes
+ *
+ * Returns 's' on success
+ */
+void *memset(void *s, int c, USIZE n);
+
+/*
  * Compare two strings to see if they are equal.
  *
  * @s1: First string