feat: initial version

srcs/ft_memset32.c

@@ -0,0 +1,37 @@
+#include <stddef.h>
+#include <stdint.h>
+
+void *ft_memset32(void *s, int c, size_t n)
+{
+    unsigned char   *ptr = (unsigned char *)s;
+    uint32_t        pattern;
+    uint32_t        *long_ptr;
+
+    unsigned char byte = (unsigned char)c;
+
+    while (n > 0 && ((uintptr_t)ptr % 4 != 0))
+    {
+        *ptr++ = byte;
+        n--;
+    }
+
+    if (n >= 4)
+    {
+        pattern = byte;
+        pattern |= pattern << 8;
+        pattern |= pattern << 16;
+
+        long_ptr = (uint32_t *)ptr;
+        while (n >= 4)
+        {
+            *long_ptr++ = pattern;
+            n -= 4;
+        }
+        ptr = (unsigned char *)long_ptr;
+    }
+
+    while (n--)
+        *ptr++ = byte;
+
+    return s;
+}