C++遍历目录，并把目录里超过7天的文件删除(跨平台windows&linux)

C++遍历目录，并把目录里超过7天的文件删除，适用于项目里删除过期的日志，或者视频文件。

在windows和linux下测试通过。

windows测试结果：

linux测试结果：

源码：

#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dirent.h"
#include <sys/stat.h>
#include <errno.h>
#ifdef WIN32

#else
    #include <unistd.h>
#endif

static int find_directory (const char *dirname);


int main(int argc, char *argv[])
{
    int i;
    int result;

    //循环遍历命令行里的每个目录
    i = 1;
    while (i < argc) {
        result = find_directory (argv[i]);
        if (result == -1) {
            exit (EXIT_FAILURE);
        }
        i++;
    }

    //如果命令行参数为空，则遍历当前工作目录
    if (argc == 1) {
        find_directory (".");
    }
    return EXIT_SUCCESS;
}

//删除7天前的文件
int RemoveFile( char* filename )
{
   int result;
   //errno_t errno;
   //获取文件信息
#ifdef WIN32
   struct _stat buf;
   result = _stat(filename, &buf);
#else
   struct stat buf;
   result = stat(filename, &buf);
#endif

   if( result != 0 )
   {
      perror( "Problem getting information" );
      switch (errno)
      {
         case ENOENT:
           printf("File %s not found.
", filename);
           break;
         case EINVAL:
           printf("Invalid parameter to _stat.
");
           break;
         default:
           /* Should never be reached. */
           printf("Unexpected error in _stat.
");
      }
      return -1;
   }
   else
   {
      // Output some of the statistics:
      printf( "File size     : %ld
", buf.st_size );
      printf( "Drive         : %c:
", buf.st_dev + 'A' );

      time_t t;
      tzset(); /*tzset()*/
      t = time(NULL);
      if((t - buf.st_mtime) > 604800)//604800是7天的秒数，下面是删除超过7天的文件
      {
        remove(filename);
        printf("remove file : %s 
" ,filename);
      }
      return 0;
   }

}

//遍历子目录和目录中的文件
static int find_directory(const char *dirname)
{
    DIR *dir;
    char buffer[PATH_MAX + 2];
    char *p = buffer;
    const char *src;
    char *end = &buffer[PATH_MAX];
    int result; //返回结果

    //copy目录名到buffer
    src = dirname;
    while (p < end  &&  *src != '') {
        *p++ = *src++;
    }
    *p = '';

    //打开目录
    dir = opendir (dirname);
    if (dir != NULL) {
        struct dirent *ent;

        while ((ent = readdir (dir)) != NULL) {//这里返回的是当前目录.
            char *q = p;
            char c;

            //获得目录的最后一个字符
            if (buffer < q) {
                c = q[-1];
            } else {
                c = ':';
            }

            //在当前给出的目录下加上/
            if (c != ':'  &&  c != '/'  &&  c != '\') {
                *q++ = '/';
            }

            //把文件名附加在后面
            src = ent->d_name; //src 为根目录.
            while (q < end  &&  *src != '') {
                *q++ = *src++;
            }
            *q = '';

            //根据是否是文件还是目录来选择操作
            switch (ent->d_type) {
            case DT_LNK:
            case DT_REG:
                //如果是文件
                printf ("%s
", buffer);
                RemoveFile(buffer);
                break;

            case DT_DIR:
                //如果是目录
                if (strcmp (ent->d_name, ".") != 0
                        &&  strcmp (ent->d_name, "..") != 0) {
                    find_directory (buffer);
                }
                break;

            default:
                /* Ignore device entries */
                /*NOP*/;
            }

        }

        closedir (dir);
        result = 0;

    } else {
        //目录打不开
        printf ("Cannot open directory %s
", dirname);
        result = -1;
    }

    return result;
}

dirent.h文件代码如下：

/*
 * dirent.h - dirent API for Microsoft Visual Studio
 *
 * Copyright (C) 2006-2012 Toni Ronkko
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * ``Software''), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL TONI RONKKO BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * $Id: dirent.h,v 1.20 2014/03/19 17:52:23 tronkko Exp $
 */
#ifndef DIRENT_H
#define DIRENT_H

/*
 * Define architecture flags so we don't need to include windows.h.
 * Avoiding windows.h makes it simpler to use windows sockets in conjunction
 * with dirent.h.
 */
#if !defined(_68K_) && !defined(_MPPC_) && !defined(_X86_) && !defined(_IA64_) && !defined(_AMD64_) && defined(_M_IX86)
#   define _X86_
#endif
#if !defined(_68K_) && !defined(_MPPC_) && !defined(_X86_) && !defined(_IA64_) && !defined(_AMD64_) && defined(_M_AMD64)
#define _AMD64_
#endif

#include <stdio.h>
#include <stdarg.h>
#include <windef.h>
#include <winbase.h>
#include <wchar.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

/* Indicates that d_type field is available in dirent structure */
#define _DIRENT_HAVE_D_TYPE

/* Indicates that d_namlen field is available in dirent structure */
#define _DIRENT_HAVE_D_NAMLEN

/* Entries missing from MSVC 6.0 */
#if !defined(FILE_ATTRIBUTE_DEVICE)
#   define FILE_ATTRIBUTE_DEVICE 0x40
#endif

/* File type and permission flags for stat() */
#if !defined(S_IFMT)
#   define S_IFMT   _S_IFMT                     /* File type mask */
#endif
#if !defined(S_IFDIR)
#   define S_IFDIR  _S_IFDIR                    /* Directory */
#endif
#if !defined(S_IFCHR)
#   define S_IFCHR  _S_IFCHR                    /* Character device */
#endif
#if !defined(S_IFFIFO)
#   define S_IFFIFO _S_IFFIFO                   /* Pipe */
#endif
#if !defined(S_IFREG)
#   define S_IFREG  _S_IFREG                    /* Regular file */
#endif
#if !defined(S_IREAD)
#   define S_IREAD  _S_IREAD                    /* Read permission */
#endif
#if !defined(S_IWRITE)
#   define S_IWRITE _S_IWRITE                   /* Write permission */
#endif
#if !defined(S_IEXEC)
#   define S_IEXEC  _S_IEXEC                    /* Execute permission */
#endif
#if !defined(S_IFIFO)
#   define S_IFIFO _S_IFIFO                     /* Pipe */
#endif
#if !defined(S_IFBLK)
#   define S_IFBLK   0                          /* Block device */
#endif
#if !defined(S_IFLNK)
#   define S_IFLNK   0                          /* Link */
#endif
#if !defined(S_IFSOCK)
#   define S_IFSOCK  0                          /* Socket */
#endif

#if defined(_MSC_VER)
#   define S_IRUSR  S_IREAD                     /* Read user */
#   define S_IWUSR  S_IWRITE                    /* Write user */
#   define S_IXUSR  0                           /* Execute user */
#   define S_IRGRP  0                           /* Read group */
#   define S_IWGRP  0                           /* Write group */
#   define S_IXGRP  0                           /* Execute group */
#   define S_IROTH  0                           /* Read others */
#   define S_IWOTH  0                           /* Write others */
#   define S_IXOTH  0                           /* Execute others */
#endif

/* Maximum length of file name */
#if !defined(PATH_MAX)
#   define PATH_MAX MAX_PATH
#endif
#if !defined(FILENAME_MAX)
#   define FILENAME_MAX MAX_PATH
#endif
#if !defined(NAME_MAX)
#   define NAME_MAX FILENAME_MAX
#endif

/* File type flags for d_type */
#define DT_UNKNOWN  0
#define DT_REG      S_IFREG
#define DT_DIR      S_IFDIR
#define DT_FIFO     S_IFIFO
#define DT_SOCK     S_IFSOCK
#define DT_CHR      S_IFCHR
#define DT_BLK      S_IFBLK
#define DT_LNK      S_IFLNK

/* Macros for converting between st_mode and d_type */
#define IFTODT(mode) ((mode) & S_IFMT)
#define DTTOIF(type) (type)

/*
 * File type macros.  Note that block devices, sockets and links cannot be
 * distinguished on Windows and the macros S_ISBLK, S_ISSOCK and S_ISLNK are
 * only defined for compatibility.  These macros should always return false
 * on Windows.
 */
#define    S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
#define    S_ISDIR(mode)  (((mode) & S_IFMT) == S_IFDIR)
#define    S_ISREG(mode)  (((mode) & S_IFMT) == S_IFREG)
#define    S_ISLNK(mode)  (((mode) & S_IFMT) == S_IFLNK)
#define    S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
#define    S_ISCHR(mode)  (((mode) & S_IFMT) == S_IFCHR)
#define    S_ISBLK(mode)  (((mode) & S_IFMT) == S_IFBLK)

/* Return the exact length of d_namlen without zero terminator */
#define _D_EXACT_NAMLEN(p) ((p)->d_namlen)

/* Return number of bytes needed to store d_namlen */
#define _D_ALLOC_NAMLEN(p) (PATH_MAX)


#ifdef __cplusplus
extern "C" {
#endif


/* Wide-character version */
struct _wdirent {
    long d_ino;                                 /* Always zero */
    unsigned short d_reclen;                    /* Structure size */
    size_t d_namlen;                            /* Length of name without  */
    int d_type;                                 /* File type */
    wchar_t d_name[PATH_MAX];                   /* File name */
};
typedef struct _wdirent _wdirent;

struct _WDIR {
    struct _wdirent ent;                        /* Current directory entry */
    WIN32_FIND_DATAW data;                      /* Private file data */
    int cached;                                 /* True if data is valid */
    HANDLE handle;                              /* Win32 search handle */
    wchar_t *patt;                              /* Initial directory name */
};
typedef struct _WDIR _WDIR;

static _WDIR *_wopendir (const wchar_t *dirname);
static struct _wdirent *_wreaddir (_WDIR *dirp);
static int _wclosedir (_WDIR *dirp);
static void _wrewinddir (_WDIR* dirp);


/* For compatibility with Symbian */
#define wdirent _wdirent
#define WDIR _WDIR
#define wopendir _wopendir
#define wreaddir _wreaddir
#define wclosedir _wclosedir
#define wrewinddir _wrewinddir


/* Multi-byte character versions */
struct dirent {
    long d_ino;                                 /* Always zero */
    unsigned short d_reclen;                    /* Structure size */
    size_t d_namlen;                            /* Length of name without  */
    int d_type;                                 /* File type */
    char d_name[PATH_MAX];                      /* File name */
};
typedef struct dirent dirent;

struct DIR {
    struct dirent ent;
    struct _WDIR *wdirp;
};
typedef struct DIR DIR;

static DIR *opendir (const char *dirname);
static struct dirent *readdir (DIR *dirp);
static int closedir (DIR *dirp);
static void rewinddir (DIR* dirp);


/* Internal utility functions */
static WIN32_FIND_DATAW *dirent_first (_WDIR *dirp);
static WIN32_FIND_DATAW *dirent_next (_WDIR *dirp);

static int dirent_mbstowcs_s(
    size_t *pReturnValue,
    wchar_t *wcstr,
    size_t sizeInWords,
    const char *mbstr,
    size_t count);

static int dirent_wcstombs_s(
    size_t *pReturnValue,
    char *mbstr,
    size_t sizeInBytes,
    const wchar_t *wcstr,
    size_t count);

static void dirent_set_errno (int error);

/*
 * Open directory stream DIRNAME for read and return a pointer to the
 * internal working area that is used to retrieve individual directory
 * entries.
 */
static _WDIR*
_wopendir(
    const wchar_t *dirname)
{
    _WDIR *dirp = NULL;
    int error;

    /* Must have directory name */
    if (dirname == NULL  ||  dirname[0] == '') {
        dirent_set_errno (ENOENT);
        return NULL;
    }

    /* Allocate new _WDIR structure */
    dirp = (_WDIR*) malloc (sizeof (struct _WDIR));
    if (dirp != NULL) {
        DWORD n;

        /* Reset _WDIR structure */
        dirp->handle = INVALID_HANDLE_VALUE;
        dirp->patt = NULL;
        dirp->cached = 0;

        /* Compute the length of full path plus zero terminator */
        n = GetFullPathNameW (dirname, 0, NULL, NULL);

        /* Allocate room for absolute directory name and search pattern */
        dirp->patt = (wchar_t*) malloc (sizeof (wchar_t) * n + 16);
        if (dirp->patt) {

            /*
             * Convert relative directory name to an absolute one.  This
             * allows rewinddir() to function correctly even when current
             * working directory is changed between opendir() and rewinddir().
             */
            n = GetFullPathNameW (dirname, n, dirp->patt, NULL);
            if (n > 0) {
                wchar_t *p;

                /* Append search pattern * to the directory name */
                p = dirp->patt + n;
                if (dirp->patt < p) {
                    switch (p[-1]) {
                    case '\':
                    case '/':
                    case ':':
                        /* Directory ends in path separator, e.g. c:	emp */
                        /*NOP*/;
                        break;

                    default:
                        /* Directory name doesn't end in path separator */
                        *p++ = '\';
                    }
                }
                *p++ = '*';
                *p = '';

                /* Open directory stream and retrieve the first entry */
                if (dirent_first (dirp)) {
                    /* Directory stream opened successfully */
                    error = 0;
                } else {
                    /* Cannot retrieve first entry */
                    error = 1;
                    dirent_set_errno (ENOENT);
                }

            } else {
                /* Cannot retrieve full path name */
                dirent_set_errno (ENOENT);
                error = 1;
            }

        } else {
            /* Cannot allocate memory for search pattern */
            error = 1;
        }

    } else {
        /* Cannot allocate _WDIR structure */
        error = 1;
    }

    /* Clean up in case of error */
    if (error  &&  dirp) {
        _wclosedir (dirp);
        dirp = NULL;
    }

    return dirp;
}

/*
 * Read next directory entry.  The directory entry is returned in dirent
 * structure in the d_name field.  Individual directory entries returned by
 * this function include regular files, sub-directories, pseudo-directories
 * "." and ".." as well as volume labels, hidden files and system files.
 */
static struct _wdirent*
_wreaddir(
    _WDIR *dirp)
{
    WIN32_FIND_DATAW *datap;
    struct _wdirent *entp;

    /* Read next directory entry */
    datap = dirent_next (dirp);
    if (datap) {
        size_t n;
        DWORD attr;
        
        /* Pointer to directory entry to return */
        entp = &dirp->ent;

        /* 
         * Copy file name as wide-character string.  If the file name is too
         * long to fit in to the destination buffer, then truncate file name
         * to PATH_MAX characters and zero-terminate the buffer.
         */
        n = 0;
        while (n + 1 < PATH_MAX  &&  datap->cFileName[n] != 0) {
            entp->d_name[n] = datap->cFileName[n];
            n++;
        }
        dirp->ent.d_name[n] = 0;

        /* Length of file name excluding zero terminator */
        entp->d_namlen = n;

        /* File type */
        attr = datap->dwFileAttributes;
        if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
            entp->d_type = DT_CHR;
        } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
            entp->d_type = DT_DIR;
        } else {
            entp->d_type = DT_REG;
        }

        /* Reset dummy fields */
        entp->d_ino = 0;
        entp->d_reclen = sizeof (struct _wdirent);

    } else {

        /* Last directory entry read */
        entp = NULL;

    }

    return entp;
}

/*
 * Close directory stream opened by opendir() function.  This invalidates the
 * DIR structure as well as any directory entry read previously by
 * _wreaddir().
 */
static int
_wclosedir(
    _WDIR *dirp)
{
    int ok;
    if (dirp) {

        /* Release search handle */
        if (dirp->handle != INVALID_HANDLE_VALUE) {
            FindClose (dirp->handle);
            dirp->handle = INVALID_HANDLE_VALUE;
        }

        /* Release search pattern */
        if (dirp->patt) {
            free (dirp->patt);
            dirp->patt = NULL;
        }

        /* Release directory structure */
        free (dirp);
        ok = /*success*/0;

    } else {
        /* Invalid directory stream */
        dirent_set_errno (EBADF);
        ok = /*failure*/-1;
    }
    return ok;
}

/*
 * Rewind directory stream such that _wreaddir() returns the very first
 * file name again.
 */
static void
_wrewinddir(
    _WDIR* dirp)
{
    if (dirp) {
        /* Release existing search handle */
        if (dirp->handle != INVALID_HANDLE_VALUE) {
            FindClose (dirp->handle);
        }

        /* Open new search handle */
        dirent_first (dirp);
    }
}

/* Get first directory entry (internal) */
static WIN32_FIND_DATAW*
dirent_first(
    _WDIR *dirp)
{
    WIN32_FIND_DATAW *datap;

    /* Open directory and retrieve the first entry */
    dirp->handle = FindFirstFileW (dirp->patt, &dirp->data);
    if (dirp->handle != INVALID_HANDLE_VALUE) {

        /* a directory entry is now waiting in memory */
        datap = &dirp->data;
        dirp->cached = 1;

    } else {

        /* Failed to re-open directory: no directory entry in memory */
        dirp->cached = 0;
        datap = NULL;

    }
    return datap;
}

/* Get next directory entry (internal) */
static WIN32_FIND_DATAW*
dirent_next(
    _WDIR *dirp)
{
    WIN32_FIND_DATAW *p;

    /* Get next directory entry */
    if (dirp->cached != 0) {

        /* A valid directory entry already in memory */
        p = &dirp->data;
        dirp->cached = 0;

    } else if (dirp->handle != INVALID_HANDLE_VALUE) {

        /* Get the next directory entry from stream */
        if (FindNextFileW (dirp->handle, &dirp->data) != FALSE) {
            /* Got a file */
            p = &dirp->data;
        } else {
            /* The very last entry has been processed or an error occured */
            FindClose (dirp->handle);
            dirp->handle = INVALID_HANDLE_VALUE;
            p = NULL;
        }

    } else {

        /* End of directory stream reached */
        p = NULL;

    }

    return p;
}

/* 
 * Open directory stream using plain old C-string.
 */
static DIR*
opendir(
    const char *dirname) 
{
    struct DIR *dirp;
    int error;

    /* Must have directory name */
    if (dirname == NULL  ||  dirname[0] == '') {
        dirent_set_errno (ENOENT);
        return NULL;
    }

    /* Allocate memory for DIR structure */
    dirp = (DIR*) malloc (sizeof (struct DIR));
    if (dirp) {
        wchar_t wname[PATH_MAX];
        size_t n;

        /* Convert directory name to wide-character string */
        error = dirent_mbstowcs_s (&n, wname, PATH_MAX, dirname, PATH_MAX);
        if (!error) {

            /* Open directory stream using wide-character name */
            dirp->wdirp = _wopendir (wname);
            if (dirp->wdirp) {
                /* Directory stream opened */
                error = 0;
            } else {
                /* Failed to open directory stream */
                error = 1;
            }

        } else {
            /* 
             * Cannot convert file name to wide-character string.  This
             * occurs if the string contains invalid multi-byte sequences or
             * the output buffer is too small to contain the resulting
             * string.
             */
            error = 1;
        }

    } else {
        /* Cannot allocate DIR structure */
        error = 1;
    }

    /* Clean up in case of error */
    if (error  &&  dirp) {
        free (dirp);
        dirp = NULL;
    }

    return dirp;
}

/*
 * Read next directory entry.
 *
 * When working with text consoles, please note that file names returned by
 * readdir() are represented in the default ANSI code page while any output to
 * console is typically formatted on another code page.  Thus, non-ASCII
 * characters in file names will not usually display correctly on console.  The
 * problem can be fixed in two ways: (1) change the character set of console
 * to 1252 using chcp utility and use Lucida Console font, or (2) use
 * _cprintf function when writing to console.  The _cprinf() will re-encode
 * ANSI strings to the console code page so many non-ASCII characters will
 * display correcly.
 */
static struct dirent*
readdir(
    DIR *dirp) 
{
    WIN32_FIND_DATAW *datap;
    struct dirent *entp;

    /* Read next directory entry */
    datap = dirent_next (dirp->wdirp);
    if (datap) {
        size_t n;
        int error;

        /* Attempt to convert file name to multi-byte string */
        error = dirent_wcstombs_s(
            &n, dirp->ent.d_name, PATH_MAX, datap->cFileName, PATH_MAX);

        /* 
         * If the file name cannot be represented by a multi-byte string,
         * then attempt to use old 8+3 file name.  This allows traditional
         * Unix-code to access some file names despite of unicode
         * characters, although file names may seem unfamiliar to the user.
         *
         * Be ware that the code below cannot come up with a short file
         * name unless the file system provides one.  At least
         * VirtualBox shared folders fail to do this.
         */
        if (error  &&  datap->cAlternateFileName[0] != '') {
            error = dirent_wcstombs_s(
                &n, dirp->ent.d_name, PATH_MAX, 
                datap->cAlternateFileName, PATH_MAX);
        }

        if (!error) {
            DWORD attr;

            /* Initialize directory entry for return */
            entp = &dirp->ent;

            /* Length of file name excluding zero terminator */
            entp->d_namlen = n - 1;

            /* File attributes */
            attr = datap->dwFileAttributes;
            if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
                entp->d_type = DT_CHR;
            } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
                entp->d_type = DT_DIR;
            } else {
                entp->d_type = DT_REG;
            }

            /* Reset dummy fields */
            entp->d_ino = 0;
            entp->d_reclen = sizeof (struct dirent);

        } else {
            /* 
             * Cannot convert file name to multi-byte string so construct
             * an errornous directory entry and return that.  Note that
             * we cannot return NULL as that would stop the processing
             * of directory entries completely.
             */
            entp = &dirp->ent;
            entp->d_name[0] = '?';
            entp->d_name[1] = '';
            entp->d_namlen = 1;
            entp->d_type = DT_UNKNOWN;
            entp->d_ino = 0;
            entp->d_reclen = 0;
        }

    } else {
        /* No more directory entries */
        entp = NULL;
    }

    return entp;
}

/*
 * Close directory stream.
 */
static int
closedir(
    DIR *dirp) 
{
    int ok;
    if (dirp) {

        /* Close wide-character directory stream */
        ok = _wclosedir (dirp->wdirp);
        dirp->wdirp = NULL;

        /* Release multi-byte character version */
        free (dirp);

    } else {

        /* Invalid directory stream */
        dirent_set_errno (EBADF);
        ok = /*failure*/-1;

    }
    return ok;
}

/*
 * Rewind directory stream to beginning.
 */
static void
rewinddir(
    DIR* dirp) 
{
    /* Rewind wide-character string directory stream */
    _wrewinddir (dirp->wdirp);
}

/* Convert multi-byte string to wide character string */
static int
dirent_mbstowcs_s(
    size_t *pReturnValue,
    wchar_t *wcstr,
    size_t sizeInWords,
    const char *mbstr,
    size_t count)
{
    int error;

#if defined(_MSC_VER)  &&  _MSC_VER >= 1400

    /* Microsoft Visual Studio 2005 or later */
    error = mbstowcs_s (pReturnValue, wcstr, sizeInWords, mbstr, count);

#else

    /* Older Visual Studio or non-Microsoft compiler */
    size_t n;

    /* Convert to wide-character string (or count characters) */
    n = mbstowcs (wcstr, mbstr, sizeInWords);
    if (!wcstr  ||  n < count) {

        /* Zero-terminate output buffer */
        if (wcstr  &&  sizeInWords) {
            if (n >= sizeInWords) {
                n = sizeInWords - 1;
            }
            wcstr[n] = 0;
        }

        /* Length of resuting multi-byte string WITH zero terminator */
        if (pReturnValue) {
            *pReturnValue = n + 1;
        }

        /* Success */
        error = 0;

    } else {

        /* Could not convert string */
        error = 1;

    }

#endif

    return error;
}

/* Convert wide-character string to multi-byte string */
static int
dirent_wcstombs_s(
    size_t *pReturnValue,
    char *mbstr,
    size_t sizeInBytes, /* max size of mbstr */
    const wchar_t *wcstr,
    size_t count)
{
    int error;

#if defined(_MSC_VER)  &&  _MSC_VER >= 1400

    /* Microsoft Visual Studio 2005 or later */
    error = wcstombs_s (pReturnValue, mbstr, sizeInBytes, wcstr, count);

#else

    /* Older Visual Studio or non-Microsoft compiler */
    size_t n;

    /* Convert to multi-byte string (or count the number of bytes needed) */
    n = wcstombs (mbstr, wcstr, sizeInBytes);
    if (!mbstr  ||  n < count) {

        /* Zero-terminate output buffer */
        if (mbstr  &&  sizeInBytes) {
            if (n >= sizeInBytes) {
                n = sizeInBytes - 1;
            }
            mbstr[n] = '';
        }

        /* Lenght of resulting multi-bytes string WITH zero-terminator */
        if (pReturnValue) {
            *pReturnValue = n + 1;
        }

        /* Success */
        error = 0;

    } else {

        /* Cannot convert string */
        error = 1;

    }

#endif

    return error;
}

/* Set errno variable */
static void
dirent_set_errno(
    int error)
{
#if defined(_MSC_VER)  &&  _MSC_VER >= 1400

    /* Microsoft Visual Studio 2005 and later */
    _set_errno (error);

#else

    /* Non-Microsoft compiler or older Microsoft compiler */
    errno = error;

#endif
}


#ifdef __cplusplus
}
#endif
#endif /*DIRENT_H*/

头文件请参考我的另外一篇博客：

http://www.cnblogs.com/matthew-2013/p/4676112.html