C

Configuration example

[project]
name      = "my-c-app"
root      = "."
languages = ["c"]

[[layers]]
name            = "domain"
paths           = ["src/domain/**"]
dependency_mode = "opt-in"
allow           = []
external_mode   = "opt-out"
external_deny   = []

[[layers]]
name            = "usecase"
paths           = ["src/usecase/**"]
dependency_mode = "opt-in"
allow           = ["domain"]
external_mode   = "opt-out"
external_deny   = []

[[layers]]
name            = "infrastructure"
paths           = ["src/infrastructure/**"]
dependency_mode = "opt-out"
deny            = []
external_mode   = "opt-out"
external_deny   = []

Include classification

Include	Category
#include "domain/user.h"	Internal (local header)
#include "create_user.h"	Internal (same directory)
#include <stdio.h>	Stdlib
#include <stdlib.h>	Stdlib
#include <curl/curl.h>	External (third-party)

Classification rules

• #include "..." (double quotes) → Internal (project headers)
• #include <...> (angle brackets) → Stdlib if it’s a C standard / POSIX header, otherwise External

Relative paths (e.g. ../domain/user.h) are normalized before layer matching.

Supported file extensions

Both .c and .h files are analyzed.

Naming conventions

Symbol (function definitions, struct/enum/union/typedef), Variable (global variables), and Comment are all checked against name_deny rules.