Function wasmer_runtime_c_api::instance::wasmer_instance_context_memory

#[no_mangle]
pub extern "C" fn wasmer_instance_context_memory(
    ctx: *const wasmer_instance_context_t, 
    _memory_idx: u32
) -> *const wasmer_memory_t

Gets the memory_idxth memory of the instance.

Note that the index is always 0 until multiple memories are supported.

This function is mostly used inside host functions (aka imported functions) to read the instance memory.

Example of a host function that reads and prints a string based on a pointer and a length:

void print_string(const wasmer_instance_context_t *context, int32_t pointer, int32_t length) {
    // Get the 0th memory.
    const wasmer_memory_t *memory = wasmer_instance_context_memory(context, 0);

    // Get the memory data as a pointer.
    uint8_t *memory_bytes = wasmer_memory_data(memory);

    // Print what we assumed to be a string!
    printf("%.*s", length, memory_bytes + pointer);
}