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#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "dirent.h"
DIR*
opendir(const char* pDirName)
{
struct stat sb;
DIR* pDir;
char* pEndDirName;
int nBufferLen;
/* sanity checks */
if (!pDirName) {
errno = EINVAL;
return NULL;
}
if (stat(pDirName, &sb) != 0) {
errno = ENOENT;
return NULL;
}
if ((sb.st_mode & S_IFMT) != S_IFDIR) {
errno = ENOTDIR;
return NULL;
}
/* allocate a DIR structure to return */
pDir = (DIR *) malloc(sizeof (DIR));
if (!pDir)
return NULL;
/* input directory name length */
nBufferLen = strlen(pDirName);
/* copy input directory name to DIR buffer */
strcpy(pDir->dir_pDirectoryName, pDirName);
/* point to end of the copied directory name */
pEndDirName = &pDir->dir_pDirectoryName[nBufferLen - 1];
/* if directory name did not end in '/' or '\', add '/' */
if ((*pEndDirName != '/') && (*pEndDirName != '\\')) {
pEndDirName++;
*pEndDirName = '/';
}
/* now append the wildcard character to the buffer */
pEndDirName++;
*pEndDirName = '*';
pEndDirName++;
*pEndDirName = '\0';
/* other values defaulted */
pDir->dir_nNumFiles = 0;
pDir->dir_hDirHandle = INVALID_HANDLE_VALUE;
pDir->dir_ulCookie = __DIRENT_COOKIE;
return pDir;
}
void
closedir(DIR *pDir)
{
/* got a valid pointer? */
if (!pDir) {
errno = EINVAL;
return;
}
/* sanity check that this is a DIR pointer */
if (pDir->dir_ulCookie != __DIRENT_COOKIE) {
errno = EINVAL;
return;
}
/* close the WIN32 directory handle */
if (pDir->dir_hDirHandle != INVALID_HANDLE_VALUE)
FindClose(pDir->dir_hDirHandle);
free(pDir);
return;
}
struct dirent *
readdir(DIR* pDir)
{
WIN32_FIND_DATA wfdFindData;
if (!pDir) {
errno = EINVAL;
return NULL;
}
/* sanity check that this is a DIR pointer */
if (pDir->dir_ulCookie != __DIRENT_COOKIE) {
errno = EINVAL;
return NULL;
}
if (pDir->dir_nNumFiles == 0) {
pDir->dir_hDirHandle = FindFirstFile(pDir->dir_pDirectoryName, &wfdFindData);
if (pDir->dir_hDirHandle == INVALID_HANDLE_VALUE)
return NULL;
} else if (!FindNextFile(pDir->dir_hDirHandle, &wfdFindData))
return NULL;
/* bump count for next call to readdir() or telldir() */
pDir->dir_nNumFiles++;
/* fill in struct dirent values */
pDir->dir_sdReturn.d_ino = -1;
strcpy(pDir->dir_sdReturn.d_name, wfdFindData.cFileName);
return &pDir->dir_sdReturn;
}
void
rewinddir(DIR* pDir)
{
if (!pDir) {
errno = EINVAL;
return;
}
/* sanity check that this is a DIR pointer */
if (pDir->dir_ulCookie != __DIRENT_COOKIE) {
errno = EINVAL;
return;
}
/* close the WIN32 directory handle */
if (pDir->dir_hDirHandle != INVALID_HANDLE_VALUE)
if (!FindClose(pDir->dir_hDirHandle))
errno = EBADF;
/* reset members which control readdir() */
pDir->dir_hDirHandle = INVALID_HANDLE_VALUE;
pDir->dir_nNumFiles = 0;
return;
}
int
telldir(DIR* pDir)
{
if (!pDir) {
errno = EINVAL;
return -1;
}
/* sanity check that this is a DIR pointer */
if (pDir->dir_ulCookie != __DIRENT_COOKIE) {
errno = EINVAL;
return -1;
}
/* return number of times readdir() called */
return pDir->dir_nNumFiles;
}
void
seekdir(DIR* pDir, long nPosition)
{
if (!pDir)
return;
/* sanity check that this is a DIR pointer */
if (pDir->dir_ulCookie != __DIRENT_COOKIE)
return;
/* go back to beginning of directory */
rewinddir(pDir);
/* loop until we have found position we care about */
for (--nPosition; nPosition && readdir(pDir); nPosition--);
/* flag invalid nPosition value */
if (nPosition)
errno = EINVAL;
return;
}
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