greenplumn dirent 源码
greenplumn dirent 代码
文件路径：/src/port/dirent.c
/*-------------------------------------------------------------------------
*
* dirent.c
* opendir/readdir/closedir for win32/msvc
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/port/dirent.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include <dirent.h>
struct DIR
{
char *dirname;
struct dirent ret; /* Used to return to caller */
HANDLE handle;
};
DIR *
opendir(const char *dirname)
{
DWORD attr;
DIR *d;
/* Make sure it is a directory */
attr = GetFileAttributes(dirname);
if (attr == INVALID_FILE_ATTRIBUTES)
{
errno = ENOENT;
return NULL;
}
if ((attr & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY)
{
errno = ENOTDIR;
return NULL;
}
d = malloc(sizeof(DIR));
if (!d)
{
errno = ENOMEM;
return NULL;
}
d->dirname = malloc(strlen(dirname) + 4);
if (!d->dirname)
{
errno = ENOMEM;
free(d);
return NULL;
}
strcpy(d->dirname, dirname);
if (d->dirname[strlen(d->dirname) - 1] != '/' &&
d->dirname[strlen(d->dirname) - 1] != '\\')
strcat(d->dirname, "\\"); /* Append backslash if not already there */
strcat(d->dirname, "*"); /* Search for entries named anything */
d->handle = INVALID_HANDLE_VALUE;
d->ret.d_ino = 0; /* no inodes on win32 */
d->ret.d_reclen = 0; /* not used on win32 */
return d;
}
struct dirent *
readdir(DIR *d)
{
WIN32_FIND_DATA fd;
if (d->handle == INVALID_HANDLE_VALUE)
{
d->handle = FindFirstFile(d->dirname, &fd);
if (d->handle == INVALID_HANDLE_VALUE)
{
/* If there are no files, force errno=0 (unlike mingw) */
if (GetLastError() == ERROR_FILE_NOT_FOUND)
errno = 0;
else
_dosmaperr(GetLastError());
return NULL;
}
}
else
{
if (!FindNextFile(d->handle, &fd))
{
/* If there are no more files, force errno=0 (like mingw) */
if (GetLastError() == ERROR_NO_MORE_FILES)
errno = 0;
else
_dosmaperr(GetLastError());
return NULL;
}
}
strcpy(d->ret.d_name, fd.cFileName); /* Both strings are MAX_PATH long */
d->ret.d_namlen = strlen(d->ret.d_name);
return &d->ret;
}
int
closedir(DIR *d)
{
int ret = 0;
if (d->handle != INVALID_HANDLE_VALUE)
ret = !FindClose(d->handle);
free(d->dirname);
free(d);
return ret;
}
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