agrego practicas

c/arena2/main.c

@@ -0,0 +1,82 @@
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define FPS 10
+
+typedef struct{
+    unsigned char *buffer;
+    size_t size;
+    size_t offset;
+}Arena;
+
+Arena arena_create(size_t);
+void* arena_alloc(Arena *, size_t);
+void arena_reset(Arena *);
+void arena_destroy(Arena *);
+
+int main(void){
+    srand(time(NULL));
+    Arena  arena =  arena_create(100);
+
+    for(int i=0; i < FPS; i++){
+
+        int* ptrLeft = arena_alloc(&arena, sizeof(int));
+
+        if(ptrLeft != NULL){
+            *ptrLeft = rand()%FPS;
+            printf("El datos del frame es: %d\n", *ptrLeft);
+        }
+
+        arena_reset(&arena);
+    }
+
+    arena_destroy(&arena);
+
+    return 0;
+}
+
+Arena arena_create( size_t bytes){
+    Arena new_arena = {
+        .buffer = NULL,
+        .size = bytes,
+        .offset = 0
+    };
+
+    new_arena.buffer = (unsigned char *)malloc(bytes);
+
+    if(new_arena.buffer == NULL){
+        perror("Error asignando memoria");
+        exit(1);
+    }
+
+    return new_arena;
+
+}
+void* arena_alloc(Arena *ref_arena, size_t bytes){
+
+    if(ref_arena->buffer == NULL){
+        return NULL;
+    }
+
+    if(ref_arena->offset + bytes > ref_arena->size){
+        perror("Memoria llena\n");
+        return NULL;
+    }
+    void* ptr_ref = ref_arena->buffer + ref_arena->offset;
+    ref_arena->offset += bytes;
+    return ptr_ref;
+}
+
+void arena_reset(Arena *ref_arena){
+    ref_arena->offset = 0;
+}
+
+void arena_destroy(Arena *ref_arena){
+    if(ref_arena->buffer != NULL){
+        free(ref_arena->buffer);
+        ref_arena->buffer = NULL;
+    }
+}
+