PostgreSQL Source Code  git master
dirent.c
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1 /*-------------------------------------------------------------------------
2  *
3  * dirent.c
4  * opendir/readdir/closedir for win32/msvc
5  *
6  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/port/dirent.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 
16 #ifndef FRONTEND
17 #include "postgres.h"
18 #else
19 #include "postgres_fe.h"
20 #endif
21 
22 #include <dirent.h>
23 
24 
25 struct DIR
26 {
27  char *dirname;
28  struct dirent ret; /* Used to return to caller */
29  HANDLE handle;
30 };
31 
32 DIR *
33 opendir(const char *dirname)
34 {
35  DWORD attr;
36  DIR *d;
37 
38  /* Make sure it is a directory */
39  attr = GetFileAttributes(dirname);
40  if (attr == INVALID_FILE_ATTRIBUTES)
41  {
42  errno = ENOENT;
43  return NULL;
44  }
45  if ((attr & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY)
46  {
47  errno = ENOTDIR;
48  return NULL;
49  }
50 
51  d = malloc(sizeof(DIR));
52  if (!d)
53  {
54  errno = ENOMEM;
55  return NULL;
56  }
57  d->dirname = malloc(strlen(dirname) + 4);
58  if (!d->dirname)
59  {
60  errno = ENOMEM;
61  free(d);
62  return NULL;
63  }
64  strcpy(d->dirname, dirname);
65  if (d->dirname[strlen(d->dirname) - 1] != '/' &&
66  d->dirname[strlen(d->dirname) - 1] != '\\')
67  strcat(d->dirname, "\\"); /* Append backslash if not already there */
68  strcat(d->dirname, "*"); /* Search for entries named anything */
69  d->handle = INVALID_HANDLE_VALUE;
70  d->ret.d_ino = 0; /* no inodes on win32 */
71  d->ret.d_reclen = 0; /* not used on win32 */
72  d->ret.d_type = DT_UNKNOWN;
73 
74  return d;
75 }
76 
77 struct dirent *
79 {
80  WIN32_FIND_DATA fd;
81 
82  if (d->handle == INVALID_HANDLE_VALUE)
83  {
84  d->handle = FindFirstFile(d->dirname, &fd);
85  if (d->handle == INVALID_HANDLE_VALUE)
86  {
87  /* If there are no files, force errno=0 (unlike mingw) */
88  if (GetLastError() == ERROR_FILE_NOT_FOUND)
89  errno = 0;
90  else
91  _dosmaperr(GetLastError());
92  return NULL;
93  }
94  }
95  else
96  {
97  if (!FindNextFile(d->handle, &fd))
98  {
99  /* If there are no more files, force errno=0 (like mingw) */
100  if (GetLastError() == ERROR_NO_MORE_FILES)
101  errno = 0;
102  else
103  _dosmaperr(GetLastError());
104  return NULL;
105  }
106  }
107  strcpy(d->ret.d_name, fd.cFileName); /* Both strings are MAX_PATH long */
108  d->ret.d_namlen = strlen(d->ret.d_name);
109  /* The only identified types are: directory, regular file or symbolic link */
110  if ((fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
111  d->ret.d_type = DT_DIR;
112  /* For reparse points dwReserved0 field will contain the ReparseTag */
113  else if ((fd.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0 &&
114  (fd.dwReserved0 == IO_REPARSE_TAG_MOUNT_POINT))
115  d->ret.d_type = DT_LNK;
116  else
117  d->ret.d_type = DT_REG;
118 
119  return &d->ret;
120 }
121 
122 int
124 {
125  int ret = 0;
126 
127  if (d->handle != INVALID_HANDLE_VALUE)
128  ret = !FindClose(d->handle);
129  free(d->dirname);
130  free(d);
131 
132  return ret;
133 }
HANDLE handle
Definition: dirent.c:29
unsigned short d_reclen
Definition: dirent.h:12
#define DT_DIR
Definition: dirent.h:28
void _dosmaperr(unsigned long)
Definition: win32error.c:171
Definition: dirent.h:9
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define malloc(a)
Definition: header.h:50
struct dirent * readdir(DIR *d)
Definition: dirent.c:78
unsigned short d_namlen
Definition: dirent.h:14
Definition: dirent.c:25
char * dirname
Definition: dirent.c:27
#define DT_LNK
Definition: dirent.h:31
long d_ino
Definition: dirent.h:11
struct dirent ret
Definition: dirent.c:28
#define DT_UNKNOWN
Definition: dirent.h:25
unsigned char d_type
Definition: dirent.h:13
#define free(a)
Definition: header.h:65
DIR * opendir(const char *dirname)
Definition: dirent.c:33
int closedir(DIR *d)
Definition: dirent.c:123
#define DT_REG
Definition: dirent.h:30
char d_name[MAX_PATH]
Definition: dirent.h:15