PostgreSQL Source Code: src/port/dirent.c Source File

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dirent.c
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1/*-------------------------------------------------------------------------
2 *
3 * dirent.c
4 * opendir/readdir/closedir for win32/msvc
5 *
6 * Portions Copyright (c) 1996-2025, 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
32DIR *
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
77struct dirent *
78 readdir(DIR *d)
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
110 /*
111 * For reparse points dwReserved0 field will contain the ReparseTag. We
112 * check this first, because reparse points are also reported as
113 * directories.
114 */
115 if ((fd.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0 &&
116 (fd.dwReserved0 == IO_REPARSE_TAG_MOUNT_POINT))
117 d->ret.d_type = DT_LNK;
118 else if ((fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
119 d->ret.d_type = DT_DIR;
120 else
121 d->ret.d_type = DT_REG;
122
123 return &d->ret;
124}
125
126int
127 closedir(DIR *d)
128{
129 int ret = 0;
130
131 if (d->handle != INVALID_HANDLE_VALUE)
132 ret = !FindClose(d->handle);
133 free(d->dirname);
134 free(d);
135
136 return ret;
137}
int closedir(DIR *d)
Definition: dirent.c:127
struct dirent * readdir(DIR *d)
Definition: dirent.c:78
DIR * opendir(const char *dirname)
Definition: dirent.c:33
#define DT_DIR
Definition: dirent.h:28
#define DT_UNKNOWN
Definition: dirent.h:25
#define DT_REG
Definition: dirent.h:30
#define DT_LNK
Definition: dirent.h:31
#define free(a)
Definition: header.h:65
#define malloc(a)
Definition: header.h:50
static int fd(const char *x, int i)
Definition: preproc-init.c:105
Definition: dirent.c:26
struct dirent ret
Definition: dirent.c:28
HANDLE handle
Definition: dirent.c:29
char * dirname
Definition: dirent.c:27
Definition: dirent.h:10
char d_name[MAX_PATH]
Definition: dirent.h:15
unsigned short d_namlen
Definition: dirent.h:14
unsigned short d_reclen
Definition: dirent.h:12
long d_ino
Definition: dirent.h:11
unsigned char d_type
Definition: dirent.h:13
void _dosmaperr(unsigned long)
Definition: win32error.c:177

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