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---
name: patterns/adapter
description: Adapter (Wrapper) Pattern pattern for C development
---
# Adapter (Wrapper) Pattern
Convert interface of one module to interface expected by another. Enables integration of incompatible interfaces without modifying either.
## ikigai Application
**wrapper.h:** Adapts system calls to mockable interface:
- `posix_read_()` wraps `read()`
- `curl_easy_perform_()` wraps libcurl
- `yyjson_read_file_()` wraps yyjson
**Purpose:** Real implementations in production, mock implementations in tests via weak symbol linking.
**LLM providers:** Adapt different API formats (OpenAI, Anthropic) to unified internal message format.
**Benefit:** External dependencies isolated behind stable internal interface. Swap implementations without changing callers.
**Testing:** Inject failures, control responses, verify calls.
