在Linux中如何统计目录内文件

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//调用opendir和readdir函数对指定目录进行遍历操作//然后打印输出指定目录中各种类型的文件数目#include #include #include #include #include #include #include typedef int Myfunc(const char *, const struct stat *, int);   //定义一个函数static Myfunc myfunc;static int myftw(char *, Myfunc *);static int dopath(Myfunc *);static long nreg, ndir, nblk, nchr, nfifo, nslink, nsock, ntot;//各种类型的文件数目对应的变量char *path_alloc(int* size);int main(int argc, char *argv[]){  int ret;  if (argc != 2)  {     printf("请输入正确的参数!\n");   //参数错误     return 1;  }  ret = myftw(argv[1], myfunc);                /* does it all */  ntot = nreg + ndir + nblk + nchr + nfifo + nslink + nsock;  //计算文件总量  if (ntot == 0)     //如果目录中没有文件则将ntot设置为1以避免除数为0  {    ntot = 1;       }  //以下一次打印各种类型文件的数据  printf("普通文件 = %7ld, %5.2f %%\n", nreg, nreg*100.0/ntot);  printf("目录文件 = %7ld, %5.2f %%\n", ndir,ndir*100.0/ntot);  printf("块设备文件 = %7ld, %5.2f %%\n", nblk,nblk*100.0/ntot);  printf("字设备文件 = %7ld, %5.2f %%\n", nchr, nchr*100.0/ntot);  printf("FIFOs = %7ld, %5.2f %%\n", nfifo,nfifo*100.0/ntot);  printf("符号链接文件 = %7ld, %5.2f %%\n", nslink, nslink*100.0/ntot);  printf("套接字文件 = %7ld, %5.2f %%\n", nsock,nsock*100.0/ntot);  return ret;}//路径缓冲区分配函数char *path_alloc(int* size){  char *p = NULL;  if(!size)  {     return NULL;  }  p = malloc(256);  if(p)  {    *size = 256;  }  else  {    *size = 0;  }  return p;}#define FTW_F   1               //#define FTW_D   2               //目录#define FTW_DNR 3               //不能读的目录#define FTW_NS  4               //不能获得状态的文件static char        *fullpath;      //存放每个文件完整路径static int myftw(char *pathname, Myfunc *func){  int len;  fullpath = path_alloc(&len);  //给路径缓冲区分配一个长度  strncpy(fullpath, pathname, len); //复制文件名称  fullpath[len-1] = 0;                        return(dopath(func));}//获得文件的状态static int dopath(Myfunc* func){  struct stat    statbuf;  struct dirent  *dirp;  DIR *dp;  int ret;  char *ptr;  if (lstat(fullpath, &statbuf) < 0)       //获得文件状态失败  {    return(func(fullpath, &statbuf, FTW_NS));  }  if (S_ISDIR(statbuf.st_mode) == 0)   //如果不是目录  {    return(func(fullpath, &statbuf, FTW_F));  }  if ((ret = func(fullpath, &statbuf, FTW_D)) != 0)  {    return(ret);  }  ptr = fullpath + strlen(fullpath);      //指向路径缓冲区结尾  *ptr++ = '/';  *ptr = 0;  if ((dp = opendir(fullpath)) == NULL)      //如果不能读目录  {    return(func(fullpath, &statbuf, FTW_DNR));  }  while ((dirp = readdir(dp)) != NULL) {                if (strcmp(dirp->d_name, ".") == 0  ||                    strcmp(dirp->d_name, "..") == 0)                                continue;               /* ignore dot and dot-dot */                strcpy(ptr, dirp->d_name);      /* append name after slash */                if ((ret = dopath(func)) != 0)         /* recursive */                        break;  /* time to leave */        }        ptr[-1] = 0;  /* erase everything from slash onwards */        if (closedir(dp) < 0)        {                printf("can't close directory %s\n", fullpath);    }        return(ret);}static int myfunc(const char *pathname, const struct stat *statptr, int type){        switch (type) {        case FTW_F:                switch (statptr->st_mode & S_IFMT) {                case S_IFREG:      nreg++;         break;                case S_IFBLK:      nblk++;         break;                case S_IFCHR:      nchr++;         break;                case S_IFIFO:      nfifo++;        break;                case S_IFLNK:      nslink++;       break;                case S_IFSOCK:     nsock++;        break;                case S_IFDIR:                        printf("for S_IFDIR for %s\n", pathname);                }                break;        case FTW_D:                ndir++;                break;        case FTW_DNR:                printf("can't read directory %s\n", pathname);                break;        case FTW_NS:                printf("stat error for %s\n", pathname);                break;        default:                printf("unknown type %d for pathname %s\n", type, pathname);        }        return(0);}

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