gnu cflow 教學 (gnu cflow tutorial)

gnu cflow 教學與筆記。

Get started

Official manual webpage

Download source code

Official download webpage

wget https://ftp.gnu.org/gnu/cflow/cflow-latest.tar.gz
tar -xvf cflow-latest.tar.gz

Build source code

解壓縮後裡面有 INSTALL 文字檔案說明如何 build

cd <cflow folder>
./configure
make
sudo make install

使用方式

如果需要畫圖功能，還需要安裝 graphviz

sudo apt install graphviz

• 官網範例

/* whoami.c - a simple implementation of whoami utility */
#include <pwd.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>

int who_am_i(void) {
	struct passwd *pw;
	char *user = NULL;

	pw = getpwuid(geteuid());
	if(pw)
		user = pw->pw_name;
	else if((user = getenv("USER")) == NULL) {
		fprintf(stderr, "I don't know!\n");
		return 1;
	}
	printf("%s\n", user);
	return 0;
}

int main(int argc, char **argv) {
	if (argc > 1) {
		fprintf(stderr, "usage: whoami\n");
		return 1;
	}
	return who_am_i();
}

• 產生 pdf 檔

  cflow -f dot whoami.c | dot -Tpdf -o ~/Desktop/cflow_example.pdf

• 結果圖