Addressing sanity check

driver.c

@@ -14,14 +14,23 @@ main(void)
   rb_init(&rb, 10, malloc, sizeof(int));
 
   int data[] = { 5, 6, 7, 8 };
-  rb_push(&rb, (void *)data, 4, memcpy);
+  printf("Address at first element: %p\n", &data[0]);
+  rb_push(&rb, data, 4, memcpy);
+
+  // Print addresses of data
+  for (int i = 0; i < 4; i++) {
+    printf("Address: %u\n", &data[i]);
+  }
+
+  print_seq(data, 4);
+  print_seq(rb.buffer, 4);
 
   int dest[5];
-  rb_read(&rb, (void *)dest, 5);
+  // rb_read(&rb, (void *)dest, 5);
 
-  for (int i = 0; i < 5; i++) {
+  // for (int i = 0; i < 5; i++) {
-    printf("Data: %d\n", dest[i]);
+  //   printf("Data: %d\n", dest[i]);
-  }
+  // }
 
   rb_destroy(&rb, free);
 

ringbuf.c

@@ -7,7 +7,8 @@
 #include "ringbuf.h"
 
 void
-rb_init(struct RingBuf *rb, rb_size_t capacity, ALLOC_T malloc_fn, rb_size_t struct_size)
+rb_init(struct RingBuf *rb, rb_size_t capacity, ALLOC_T malloc_fn,
+        rb_size_t struct_size)
 {
   rb->struct_size = struct_size;
   rb->capacity = capacity;
@@ -32,9 +33,30 @@ rb_destroy(struct RingBuf *rb, void(free)())
 }
 
 enum WriteResult
-rb_push(struct RingBuf *rb, void *data[], rb_size_t amount, MEMCPY_T memcpy_fn)
+rb_push(struct RingBuf *rb, void *data, rb_size_t amount, MEMCPY_T memcpy_fn)
 {
   printf("\nWriting %d elements\n", amount);
+
+  // We need to do this iteratively, since a memcpy of 
+  // multiple elements may overshoot the buffer.
+  for(int i = 0; i < amount; i++) {
+    void *src = data + i * rb->struct_size; // One element
+    void *dest = rb->buffer + (rb->write_idx + i) * rb->struct_size;
+
+    printf("Destination: %p\n", dest);
+    printf("Buffer: %p\n", rb->buffer);
+
+    printf("struct_size: %d\n", rb->struct_size);
+
+    // For each byte in the struct, copy it over
+    for (int j = 0; j < rb->struct_size; j++) {
+      printf("Copying from %p to %p\n", src + j, dest + j);
+      printf("j: %d\n", j);
+      memcpy_fn(dest+j, src+j, 1);
+    }
+
+    // memcpy_fn(dest, src, rb->struct_size);
+  }
   return Ok;
 }
 
@@ -42,5 +64,16 @@ void
 rb_read(struct RingBuf *rb, void *dest, int amount)
 {
   printf("\nReading %d elements\n", amount);
-  for(int i = 0; i < amount; i++) { }
+  for(int i = 0; i < amount; i++) {
+  }
+}
+
+void
+print_seq(void *begin, int amount)
+{
+  printf("\nPrinting sequence\n");
+  for(int i = 0; i < amount; i++) {
+    int *val = (int *)(begin + 4 * i);
+    printf("V: %d, A: %u\n", *val, val);
+  }
 }

ringbuf.h

@@ -16,7 +16,7 @@ typedef void *(*MEMCPY_T)(void *, const void *, rb_size_t);
 struct RingBuf {
   rb_size_t struct_size; /* Size of the struct */
   rb_size_t capacity;    /* The physical capacity of the entire ringbuf */
-  rb_size_t size;    /* The current size of the ring buffer */
+  rb_size_t size;        /* The current size of the ring buffer */
   rb_size_t write_idx;   /* The write head */
   rb_size_t read_idx;    /* THe read head */
   void    **buffer;      /* The actual data */
@@ -29,7 +29,7 @@ void rb_init(struct RingBuf *rb, rb_size_t capacity, void *(*alloc)(rb_size_t),
              rb_size_t struct_size);
 
 /** Insert data to the ring buffer */
-enum WriteResult rb_push(struct RingBuf *rb, void *data[], rb_size_t amount,
+enum WriteResult rb_push(struct RingBuf *rb, void *data, rb_size_t amount,
                          void *(*memcpy)(void *, const void *, rb_size_t));
 
 /** Read data from the ring buffer */
@@ -37,3 +37,5 @@ void rb_read(struct RingBuf *rb, void *dest, int amount);
 
 /** Free the ring buffer */
 void rb_destroy(struct RingBuf *rb, void(free)());
+
+void print_seq(void *begin, int amount);