Linux 文件遍历程序

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

unsigned int list_files(char *pathname, unsigned int pathnamelength, unsigned int pathnamesize)
{
    DIR *dir;
    struct dirent *ptr;
    unsigned int l;
    unsigned int result = 0;

    if (pathnamelength == 0 || pathname[pathnamelength - 1] != '/')
    {
        pathname[pathnamelength++] = '/';
    }
    pathname[pathnamelength] = '\0';

    if ((dir = opendir(pathname)) != NULL)
    {
    while ((ptr = readdir(dir)) != NULL)
        {
            if (ptr->d_name[0] != '.' || 
                (ptr->d_name[1] != '\0' && (ptr->d_name[1] != '.' || ptr->d_name[2] != '\0')))
        {
                l = strlen(ptr->d_name);

                if (pathnamelength + l < pathnamesize)
                {
                    strcpy(pathname + pathnamelength, ptr->d_name);

                    if (ptr->d_type == 4)
                    {
                        result += list_files(pathname, pathnamelength + l, pathnamesize);
                    }
                    else
                    {
                        printf("%s\r\n", pathname);
                        result++;
                    }
                }
        }
        }
        closedir(dir);
    }
    return(result);
}

int main(int argc, char *argv[])
{
    char pathname[1024];
    unsigned int pathnamelength;

    pathname[0] = '\0';
    if (argc > 1)
    {
        pathnamelength = strlen(argv[1]);
        if (pathnamelength < sizeof(pathname))
        {
            //getcwd(pathname, sizeof(pathname));
            strcpy(pathname, argv[1]);
        }
    }
    pathnamelength = strlen(pathname);
    list_files(pathname, pathnamelength, sizeof(pathname));

    return 0;
}