递归列出目录中的文件列表

//在Linux-rethat下实现

 

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>

#define MAX_PATH 1024

/* dirwalk:  apply fcn to all files in dir */
void dirwalk(char *dir, void (*fcn)(char *))
{
        char name[MAX_PATH];
        struct dirent *dp;
        DIR *dfd;

if ((dfd = opendir(dir)) == NULL) {
                fprintf(stderr, "dirwalk: can't open %s\n", dir);
                return;
        }
        while ((dp = readdir(dfd)) != NULL) {
                if (strcmp(dp->d_name, ".") == 0
                    || strcmp(dp->d_name, "..") == 0)
                        continue;    /* skip self and parent */
                if (strlen(dir)+strlen(dp->d_name)+2 > sizeof(name))
                        fprintf(stderr, "dirwalk: name %s %s too long\n",
                                dir, dp->d_name);
                else {
                        sprintf(name, "%s/%s", dir, dp->d_name);
                        (*fcn)(name);
                }
        }
        closedir(dfd);
}

/* fsize:  print the size and name of file "name" */
void fsize(char *name)
{
        struct stat stbuf;

if (stat(name, &stbuf) == -1) {
                fprintf(stderr, "fsize: can't access %s\n", name);
                return;
        }
        if ((stbuf.st_mode & S_IFMT) == S_IFDIR)
                dirwalk(name, fsize);
        printf("%8ld %s\n", stbuf.st_size, name);
}

int main(int argc, char **argv)
{
        if (argc == 1)  /* default: current directory */
                fsize(".");
        else
                while (--argc > 0)
                        fsize(*++argv);
        return 0;
}