Implemented stdlib.h

libc/stdlib/alloc.c

@@ -0,0 +1,41 @@
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <syscall.h>
+
+void* malloc(size_t size) {
+    return (void*)syscall(SYS_MALLOC, size, 0, 0);
+}
+
+void* calloc(size_t count, size_t size) {
+    size_t total = count * size;
+    void* ptr = malloc(total);
+    
+    if (!ptr) { return NULL; }
+    memset(ptr, 0, total);
+
+    return ptr;
+}
+
+void* realloc(void* ptr, size_t size) {
+    if (size == 0) {
+        free(ptr);
+        return NULL;
+    }
+
+    if (ptr == NULL) { return malloc(size); }
+
+    void* newptr = malloc(size);
+    if (!newptr) { return NULL; }
+
+    // TODO: retrieve the old size
+    memcpy(newptr, ptr, size);
+
+    free(ptr);
+    return newptr;
+}
+
+void free(void* ptr) {
+    syscall(SYS_FREE, (int)ptr, 0, 0);
+}
+