add code coverage report

Author: jacksonwalters

Makefile

@@ -1,6 +1,11 @@
 # Compiler
 CC = gcc
 CFLAGS = -Wall -Wextra -Iinclude -g
+LDFLAGS = 
+
+# Coverage flags
+CFLAGS_COVERAGE = -Wall -Wextra -Iinclude -g -O0 -fprofile-arcs -ftest-coverage
+LDFLAGS_COVERAGE = -fprofile-arcs -ftest-coverage
 
 # Debug toggle
 ifeq ($(DEBUG),1)
@@ -26,7 +31,11 @@ APPS = $(patsubst $(APP_DIR)/%.c, $(BIN_DIR)/%, $(APP_SRCS))
 TESTS = $(patsubst $(TEST_DIR)/%.c, $(BIN_DIR)/%, $(TEST_SRCS))
 
 # Default target
-all: $(OBJ_DIR) $(BIN_DIR) $(APPS) $(TESTS)
+all: $(OBJ_DIR) $(BIN_DIR) apps tests
+
+# Build apps and tests separately
+apps: $(APPS)
+tests: $(TESTS)
 
 # Compile source files
 $(OBJ_DIR)/%.o: $(SRC_DIR)/%.c
@@ -47,8 +56,8 @@ $(OBJ_DIR):
 $(BIN_DIR):
 	mkdir -p $(BIN_DIR)
 
-# Run all tests dynamically and fail CI if any test fails
-test: $(TESTS)
+# Run all tests dynamically
+test: tests
 	@echo "Running all tests..."
 	@failed=0; \
 	for t in $(TESTS); do \
@@ -68,8 +77,28 @@ test: $(TESTS)
 		echo "All tests PASSED."; \
 	fi
 
+# Coverage targets
+coverage: clean_coverage
+	@echo "Building tests with coverage flags..."
+	$(MAKE) clean
+	$(MAKE) CFLAGS="$(CFLAGS_COVERAGE)" LDFLAGS="$(LDFLAGS_COVERAGE)" all
+	@echo "Running tests for coverage..."
+	$(MAKE) test
+	@echo "Capturing coverage..."
+	lcov --capture --directory . --output-file coverage.info --ignore-errors unsupported,unused
+	genhtml coverage.info --output-directory coverage-report
+	@echo "Coverage report generated: coverage-report/index.html"
+
+clean_coverage:
+	rm -f *.gcda *.gcno coverage.info
+	rm -rf coverage-report
+
+# Optional: quick badge
+badge:
+	@coverage=$(shell lcov --summary coverage.info 2>/dev/null | awk '/lines/ {val=$$3; gsub("%","",val); print int(val)}'); \
+	if [ -z "$$coverage" ]; then coverage=0; fi; \
+	echo "![Coverage](https://img.shields.io/badge/coverage-$$coverage%25-brightgreen)"
+
 # Clean
 clean:
 	rm -rf $(OBJ_DIR)/*.o $(BIN_DIR)/*
-
-.PHONY: all clean test

README.md

@@ -2,6 +2,7 @@
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-brightgreen.svg)](https://opensource.org/licenses/MIT)
 ![basic tests](https://github.com/jacksonwalters/aes-block-cipher-standards/actions/workflows/build.yml/badge.svg)
+![Coverage](https://img.shields.io/badge/coverage-0%25-brightgreen)
 
 This repository implements several cryptographic standards in C.