//調(diào)用opendir和readdir函數(shù)對(duì)指定目錄進(jìn)行遍歷操作

//然后打印輸出指定目錄中各種類型的文件數(shù)目

#include?

#include?

#include?

#include?

#include?

#include?

#include?

typedefint?Myfunc(const?char?*,?const?struct?stat?*,?int);???//定義一個(gè)函數(shù)

static?Myfunc?myfunc;

static?int?myftw(char?*,?Myfunc?*);

static?int?dopath(Myfunc?*);

static?long?nreg,?ndir,?nblk,?nchr,?nfifo,?nslink,?nsock,?ntot;

//各種類型的文件數(shù)目對(duì)應(yīng)的變量

char?*path_alloc(int*?size);

int?main(int?argc,?char?*argv[])

{

int?ret;

if?(argc?!=?2)

{

printf("請(qǐng)輸入正確的參數(shù)!\n");???//參數(shù)錯(cuò)誤

return?1;

}

ret?=?myftw(argv[1],?myfunc);/*?does?it?all?*/

ntot?=?nreg?+?ndir?+?nblk?+?nchr?+?nfifo?+?nslink?+?nsock;

//計(jì)算文件總量

if?(ntot?==?0)?????//如果目錄中沒(méi)有文件則將ntot設(shè)置為1以避免除數(shù)為0

{

ntot?=?1;

}

//以下一次打印各種類型文件的數(shù)據(jù)

printf("普通文件?=?%7ld,?%5.2f?%%\n",?nreg,?nreg*100.0/ntot);

printf("目錄文件?=?%7ld,?%5.2f?%%\n",?ndir,ndir*100.0/ntot);

printf("塊設(shè)備文件?=?%7ld,?%5.2f?%%\n",?nblk,nblk*100.0/ntot);

printf("字設(shè)備文件?=?%7ld,?%5.2f?%%\n",?nchr,?nchr*100.0/ntot);

printf("FIFOs?=?%7ld,?%5.2f?%%\n",?nfifo,nfifo*100.0/ntot);

printf("符號(hào)鏈接文件?=?%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;

}

//路徑緩沖區(qū)分配函數(shù)

char?*path_alloc(int*?size)

{

char?*p?=?NULL;

if(!size)

{

return?NULL;

}

p?=?malloc(256);

if(p)

{

*size?=?256;

}

else

{

*size?=?0;

}

return?p;

}

#defineFTW_F1//

#defineFTW_D2//目錄

#defineFTW_DNR3//不能讀的目錄

#defineFTW_NS4//不能獲得狀態(tài)的文件

static?char*fullpath;//存放每個(gè)文件完整路徑

static?int?myftw(char?*pathname,?Myfunc?*func)

{

int?len;

fullpath?=?path_alloc(&len);//給路徑緩沖區(qū)分配一個(gè)長(zhǎng)度

strncpy(fullpath,?pathname,?len);//復(fù)制文件名稱

fullpath[len-1]?=?0;

return(dopath(func));

}

//獲得文件的狀態(tài)

static?int?dopath(Myfunc*?func)

{

struct?statstatbuf;

struct?dirent*dirp;

DIR?*dp;

int?ret;

char?*ptr;

if?(lstat(fullpath,?&statbuf)?

{

return(func(fullpath,?&statbuf,?FTW_NS));

}

if?(S_ISDIR(statbuf.st_mode)?==?0)//如果不是目錄

{

return(func(fullpath,?&statbuf,?FTW_F));

}

if?((ret?=?func(fullpath,?&statbuf,?FTW_D))?!=?0)

{

return(ret);

}

ptr?=?fullpath?+?strlen(fullpath);//指向路徑緩沖區(qū)結(jié)尾

*ptr++?=?'/';

*ptr?=?0;

if?((dp?=?opendir(fullpath))?==?NULL)//如果不能讀目錄

{

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)?

{

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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