Implemented memset()

photon/libc/include/string.h

@@ -10,6 +10,7 @@ extern "C" {
 extern void *memcpy(void *dest, const void *src, size_t sz);
 extern void *memcmp(const void *a, const void *b, size_t sz);
 extern void *memmove(void *dest, const void *src, size_t sz);
+extern void *memset(void *ptr, int value, size_t sz);
 
 extern size_t strlen(const char *str);
 extern int strcmp(const char *a, const char *b);

photon/libc/string/memset.c

@@ -0,0 +1,28 @@
+#include <stddef.h>
+
+void *memset(void *ptr, int value, size_t sz)
+{
+    value = (unsigned char)value;
+    unsigned int realval =
+         value        |
+        (value << 8)  |
+        (value << 16) |
+        (value << 24);
+
+    unsigned char *buf = ptr;
+    size_t i = 0;
+    for (i = 0; i < sz; i += sizeof(unsigned int)) {
+        unsigned int *t = (unsigned int *)&buf[i];
+        *t = realval;
+    }
+
+    if (sz % sizeof(unsigned int)) {
+        i -= sizeof(unsigned int);
+
+        while (i < sz) {
+            buf[i++] = value;
+        }
+    }
+
+    return ptr;
+}