cflow -- C程序流程图,函数调用关系 生成工具

cflow : cflow 支持生成流程图的文件类型为： asm, c, yacc, lex
其生成的流程图支持两种模式：顺序（从main 开始） 与 逆序

针对个单个文件：
xrand.c 

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

typedef struct _display_info{
    char res[512];
    struct _display_info *next;
}Display_info;

void data_parse(char *buf, char *resdata)
{
    char res[16];
    char *split = "@";

    printf(" len: %d\t %s", strlen(buf), buf);
    int i = 0, j = 0, k = 0;
    int isblank = 1;
    int changed = 0;

    memset(res, 0, sizeof(res));
    for (i=0; i< strlen(buf); i++) {
        if (buf[i] == ' ') {
            isblank = 1;
            if (changed) {
                changed = 0;
                k++;
                printf("res: %s\n", res);
                if (k > 1) //第一获取的为分辨率
                    res[4] = 0; //只要精确到小点后1位
                strcat(resdata, res);
                strcat(resdata, split);
                memset(res, 0, sizeof(res));
            }
            continue;
        }

        if (buf[i] == '\n') {
            if (changed) {
                changed = 0;
                k++;
                printf("res: %s\n", res);
                if (k > 1) //第一获取的为分辨率
                    res[4] = 0; //只要精确到小点后1位
                strcat(resdata, res);
                strcat(resdata, split);
                memset(res, 0, sizeof(res));
            }
            continue;
        }

        if (buf[i] != ' ') {
            if (isblank) {
                j = i;
                isblank = 0;
                changed = 1;
            }
            res[i-j] = buf[i];
        }
    }

}

void get_randr(Display_info **list)
{
    char *cmd = "xrandr";
    char *mode = "r";
    FILE *fp = NULL;
    char buf[512];
//    char res[512];

    Display_info *node = NULL;
    Display_info *head = NULL;
    Display_info *tmp = NULL;

    fp = popen(cmd, mode);
    if (!fp) {
        perror("popen error:");
        return ;
    }

    memset(buf, 0, sizeof(buf));
    while(fgets(buf, sizeof(buf), fp)) {
        if (isblank(buf[0])) {
            node = (Display_info *)malloc(sizeof(Display_info));
            if(!node) {
                perror("malloc failure");
            }

            memset(node->res, 0, sizeof(node->res));
            node->next = NULL;
            data_parse(buf, node->res);
            node->res[strlen(node->res) -1] = 0;
            printf("resdata:%s\n", node->res);
            memset(buf, 0, sizeof(buf));

            if (!head) {
                head = node;
                tmp = head;
            } else {
                tmp->next = node;
                tmp = tmp->next;
            }
        }

    }

    *list = head;
}


int main(int argc, char *argv)
{
    Display_info *list = NULL;

    get_randr(&list);
    while (list) {
        printf("main:%s\n",list->res);
        list = list->next;
    }


    return 0;
}

cflow 输出内容及格式是可配制的 ，详见：

$ cflow xrandr.c
main() <int main (int argc, char *argv) at xrandr.c:112>:
    get_randr() <void get_randr (Display_info **list) at xrandr.c:64>:
        popen()
        perror()
        memset()
        fgets()
        isblank()
        malloc()
        data_parse() <void data_parse (char *buf, char *resdata) at xrandr.c:11>:
            printf()
            strlen()
            memset()
            strcat()
        strlen()
        printf()
    printf()

$ cflow --tree  xrandr.c
+-main() <int main (int argc, char *argv) at xrandr.c:112>
  +-get_randr() <void get_randr (Display_info **list) at xrandr.c:64>
  | +-popen()
  | +-perror()
  | +-memset()
  | +-fgets()
  | +-isblank()
  | +-malloc()
  | +-data_parse() <void data_parse (char *buf, char *resdata) at xrandr.c:11>
  | | +-printf()
  | | +-strlen()
  | | +-memset()
  | | \-strcat()
  | +-strlen()
  | \-printf()
  \-printf()

$ cflow --tree -f posix  xrandr.c
    1 +-main: int (int argc, char *argv), <xrandr.c 112>
    2 +-get_randr: void (Display_info **list), <xrandr.c 64>
    3 | +-popen: <>
    4 | +-perror: <>
    5 | +-memset: <>
    6 | +-fgets: <>
    7 | +-isblank: <>
    8 | +-malloc: <>
    9 | +-data_parse: void (char *buf, char *resdata), <xrandr.c 11>
   10 | | +-printf: <>
   11 | | +-strlen: <>
   12 | | +-memset: <>
   13 | | \-strcat: <>
   14 | +-strlen: <>
   15 | \-printf: <>
   16   \-printf: <>

$ cflow --tree -f gnu --number  xrandr.c
    1 +-main() <int main (int argc, char *argv) at xrandr.c:112>
    2 +-get_randr() <void get_randr (Display_info **list) at xrandr.c:64>
    3 | +-popen()
    4 | +-perror()
    5 | +-memset()
    6 | +-fgets()
    7 | +-isblank()
    8 | +-malloc()
    9 | +-data_parse() <void data_parse (char *buf, char *resdata) at xrandr.c:11>
   10 | | +-printf()
   11 | | +-strlen()
   12 | | +-memset()
   13 | | \-strcat()
   14 | +-strlen()
   15 | \-printf()
   16   \-printf()

多文件模式，即在makefile 中使用 cflow。详见：
Makefile(clfow 专用)

CFLOW_FLAGS= --tree --number

SRC=$(wildcard *.c)
program_CFLOW_INPUT=$(SRC)

program.cflow: $(program_CFLOW_INPUT) cflow.rc
    CFLOWRC=cflow.rc \
        cflow -o $@ $(CFLOW_FLAGS) $(DEFS) \
        $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
        $(CPPFLAGS) \
        $(program_CFLOW_INPUT)

在与Makefile 文件相同的目录下touch cflow.rc
执行 make 后, 生成 program.cflow 

查看program.cflow

$ cat program.cflow
    1 +-main() <int main (int argc, char *argv[]) at yuv2jpg.c:190>
    2 +-malloc()
    3 +-perror()
    4 +-init_video() <int init_video (pVd vd, char *device_name, int capture_type, int pic_format, int height, int width) at capture.c:264>
    5 | +-init_config() <int init_config (pVd vd, char *device_name, int capture_type, int pic_format, int height, int width) at capture.c:117>
    6 | | +-assert()
    7 | | +-open_video() <int open_video (char *device_name) at capture.c:33>
    8 | | | +-open()
    9 | | | \-perror()
   10 | | +-get_video_cap() <int get_video_cap (pVd vd) at capture.c:54>
   11 | | | +-ioctl()
   12 | | | \-perror()
   13 | | \-get_video_support_format() <void get_video_support_format (pVd vd) at capture.c:85>
   14 | | +-memset()
   15 | | +-ioctl()
   16 | | \-debug_p()
   17 | \-set_video() <int set_video (pVd vd) at capture.c:215>
   18 | +-ioctl()
   19 | +-perror()
   20 | +-malloc()
   21 | +-debug_p()
   22 | +-memset()
   23 | \-set_mmap_space() <int set_mmap_space (pVd vd) at capture.c:155>
   24 | +-ioctl()
   25 | +-perror()
   26 | +-memset()
   27 | +-mmap()
   28 | \-debug_p()
   29 +-capture_video() <int capture_video (pVd vd) at capture.c:448>
   30 | +-mmap_mode() <int mmap_mode (pVd vd) at capture.c:369>
   31 | | +-enable_video() <int enable_video (pVd vd) at capture.c:292>
   32 | | | +-ioctl()
   33 | | | \-perror()
   34 | | +-perror()
   35 | | +-memset()
   36 | | +-ioctl()
   37 | | +-debug_p()
   38 | | \-memcpy()
   39 | \-read_mode() <int read_mode (pVd vd) at capture.c:345>
   40 | +-read()
   41 | +-perror()
   42 | \-debug_p()
   43 +-write_file() <int write_file (FILE *fp, unsigned char *buf, int size) at yuv2jpg.c:100>
   44 | +-debug_p()
   45 | +-assert()
   46 | +-fopen()
   47 | +-fprintf()
   48 | +-fwrite()
   49 | \-fclose()
   50 +-open_file() <FILE *open_file (char *filename, char *mode) at yuv2jpg.c:28>
   51 | +-fopen()
   52 | \-perror()
   53 +-yuv422_to_jpeg() <int yuv422_to_jpeg (unsigned char *data, int image_width, int image_height, FILE *fp, int quality) at yuv2jpg.c:123>
   54 | +-jpeg_std_error()
   55 | +-jpeg_create_compress()
   56 | +-jpeg_stdio_dest()
   57 | +-jpeg_set_defaults()
   58 | +-jpeg_set_quality()
   59 | +-jpeg_start_compress()
   60 | +-memcpy()
   61 | +-jpeg_write_raw_data()
   62 | +-jpeg_finish_compress()
   63 | \-jpeg_destroy_compress()
   64 +-close_video() <void close_video (pVd vd) at capture.c:468>
   65 | +-disable_video() <int disable_video (pVd vd) at capture.c:319>
   66 | | +-ioctl()
   67 | | \-perror()
   68 | +-debug_p()
   69 | +-munmap()
   70 | +-free()
   71 | \-close()
   72 +-free()
   73 +-get_file_size() <long get_file_size (FILE *fp) at yuv2jpg.c:50>
   74 | +-fseek()
   75 | +-ftell()
   76 | \-debug_p()
   77 +-exit()
   78   \-read_file() <int read_file (FILE *fp, unsigned char *buf) at yuv2jpg.c:76>
   79 +-fread()
   80     \-debug_p()