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win32: use our own dirent.h 

The mingw-runtime implemenation of opendir, readdir and closedir
sets errno to 0 on success, something that POSIX explicitly
forbids. 3ba7a06 ("A loose object is not corrupt if it cannot be
read due to EMFILE") introduce a dependency on this behaviour,
leading to a broken "git clone" on Windows.

compat/mingw.c contains an implementation of readdir, and
compat/msvc.c contains implementations of opendir and closedir.

Move these to compat/win32/dirent.[ch], and change to our own DIR
structure at the same time.

This provides a generic Win32-implementation of opendir, readdir
and closedir which works on both MinGW and MSVC and does not reset
errno, and as a result git clone is working again on Windows.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Erik Faye-Lund 2010-11-23 19:38:29 +01:00 committed by Junio C Hamano
parent e7772600e9
commit d1b6e6e015
7 changed files with 137 additions and 271 deletions
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7
Makefile
View File

@ -499,6 +499,7 @@ LIB_H += compat/mingw.h
LIB_H += compat/win32/pthread.h
LIB_H += compat/win32/syslog.h
LIB_H += compat/win32/sys/poll.h
LIB_H += compat/win32/dirent.h
LIB_H += csum-file.h
LIB_H += decorate.h
LIB_H += delta.h
@ -1084,7 +1085,9 @@ ifeq ($(uname_S),Windows)
AR = compat/vcbuild/scripts/lib.pl
CFLAGS =
BASIC_CFLAGS = -nologo -I. -I../zlib -Icompat/vcbuild -Icompat/vcbuild/include -DWIN32 -D_CONSOLE -DHAVE_STRING_H -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE
COMPAT_OBJS = compat/msvc.o compat/fnmatch/fnmatch.o compat/winansi.o compat/win32/pthread.o compat/win32/syslog.o compat/win32/sys/poll.o
COMPAT_OBJS = compat/msvc.o compat/fnmatch/fnmatch.o compat/winansi.o \
compat/win32/pthread.o compat/win32/syslog.o \
compat/win32/sys/poll.o compat/win32/dirent.o
COMPAT_CFLAGS = -D__USE_MINGW_ACCESS -DNOGDI -DHAVE_STRING_H -DHAVE_ALLOCA_H -Icompat -Icompat/fnmatch -Icompat/regex -Icompat/fnmatch -Icompat/win32 -DSTRIP_EXTENSION=\".exe\"
BASIC_LDFLAGS = -IGNORE:4217 -IGNORE:4049 -NOLOGO -SUBSYSTEM:CONSOLE -NODEFAULTLIB:MSVCRT.lib
EXTLIBS = advapi32.lib shell32.lib wininet.lib ws2_32.lib
@ -1137,7 +1140,7 @@ ifneq (,$(findstring MINGW,$(uname_S)))
COMPAT_CFLAGS += -DSTRIP_EXTENSION=\".exe\"
COMPAT_OBJS += compat/mingw.o compat/fnmatch/fnmatch.o compat/winansi.o \
compat/win32/pthread.o compat/win32/syslog.o \
compat/win32/sys/poll.o
compat/win32/sys/poll.o compat/win32/dirent.o
EXTLIBS += -lws2_32
PTHREAD_LIBS =
X = .exe

60
compat/mingw.c
View File

@ -1564,63 +1564,3 @@ pid_t waitpid(pid_t pid, int *status, unsigned options)
errno = EINVAL;
return -1;
}
#ifndef NO_MINGW_REPLACE_READDIR
/* MinGW readdir implementation to avoid extra lstats for Git */
struct mingw_DIR
{
struct _finddata_t dd_dta; /* disk transfer area for this dir */
struct mingw_dirent dd_dir; /* Our own implementation, including d_type */
long dd_handle; /* _findnext handle */
int dd_stat; /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
char dd_name[1]; /* given path for dir with search pattern (struct is extended) */
};
struct dirent *mingw_readdir(DIR *dir)
{
WIN32_FIND_DATAA buf;
HANDLE handle;
struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
if (!dir || !dir->dd_handle) {
errno = EBADF; /* No set_errno for mingw */
return NULL;
}
if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
{
DWORD lasterr;
handle = FindFirstFileA(dir->dd_name, &buf);
lasterr = GetLastError();
dir->dd_handle = (long)handle;
if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
errno = err_win_to_posix(lasterr);
return NULL;
}
} else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
return NULL;
} else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
DWORD lasterr = GetLastError();
FindClose((HANDLE)dir->dd_handle);
dir->dd_handle = (long)INVALID_HANDLE_VALUE;
/* POSIX says you shouldn't set errno when readdir can't
find any more files; so, if another error we leave it set. */
if (lasterr != ERROR_NO_MORE_FILES)
errno = err_win_to_posix(lasterr);
return NULL;
}
/* We get here if `buf' contains valid data. */
strcpy(dir->dd_dir.d_name, buf.cFileName);
++dir->dd_stat;
/* Set file type, based on WIN32_FIND_DATA */
mdir->dd_dir.d_type = 0;
if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
mdir->dd_dir.d_type |= DT_DIR;
else
mdir->dd_dir.d_type |= DT_REG;
return (struct dirent*)&dir->dd_dir;
}
#endif // !NO_MINGW_REPLACE_READDIR

29
compat/mingw.h
View File

@ -319,35 +319,6 @@ int main(int argc, const char **argv) \
} \
static int mingw_main(c,v)
#ifndef NO_MINGW_REPLACE_READDIR
/*
* A replacement of readdir, to ensure that it reads the file type at
* the same time. This avoid extra unneeded lstats in git on MinGW
*/
#undef DT_UNKNOWN
#undef DT_DIR
#undef DT_REG
#undef DT_LNK
#define DT_UNKNOWN 0
#define DT_DIR 1
#define DT_REG 2
#define DT_LNK 3
struct mingw_dirent
{
long d_ino; /* Always zero. */
union {
unsigned short d_reclen; /* Always zero. */
unsigned char d_type; /* Reimplementation adds this */
};
unsigned short d_namlen; /* Length of name in d_name. */
char d_name[FILENAME_MAX]; /* File name. */
};
#define dirent mingw_dirent
#define readdir(x) mingw_readdir(x)
struct dirent *mingw_readdir(DIR *dir);
#endif // !NO_MINGW_REPLACE_READDIR
/*
* Used by Pthread API implementation for Windows
*/

52
compat/msvc.c
View File

@ -3,56 +3,4 @@
#include <conio.h>
#include "../strbuf.h"
DIR *opendir(const char *name)
{
DWORD attrs = GetFileAttributes(name);
int len;
DIR *p;
/* check for valid path */
if (attrs == INVALID_FILE_ATTRIBUTES) {
errno = ENOENT;
return NULL;
}
/* check if it's a directory */
if (!(attrs & FILE_ATTRIBUTE_DIRECTORY)) {
errno = ENOTDIR;
return NULL;
}
/* check that the pattern won't be too long for FindFirstFileA */
len = strlen(name);
if (is_dir_sep(name[len - 1]))
len--;
if (len + 2 >= MAX_PATH) {
errno = ENAMETOOLONG;
return NULL;
}
p = malloc(sizeof(DIR) + len + 2);
if (!p)
return NULL;
memset(p, 0, sizeof(DIR) + len + 2);
strcpy(p->dd_name, name);
p->dd_name[len] = '/';
p->dd_name[len+1] = '*';
p->dd_handle = (long)INVALID_HANDLE_VALUE;
return p;
}
int closedir(DIR *dir)
{
if (!dir) {
errno = EBADF;
return -1;
}
if (dir->dd_handle != (long)INVALID_HANDLE_VALUE)
FindClose((HANDLE)dir->dd_handle);
free(dir);
return 0;
}
#include "mingw.c"

128
compat/vcbuild/include/dirent.h
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@ -1,128 +0,0 @@
/*
* DIRENT.H (formerly DIRLIB.H)
* This file has no copyright assigned and is placed in the Public Domain.
* This file is a part of the mingw-runtime package.
*
* The mingw-runtime package and its code is distributed in the hope that it
* will be useful but WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESSED OR
* IMPLIED ARE HEREBY DISCLAIMED. This includes but is not limited to
* warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You are free to use this package and its code without limitation.
*/
#ifndef _DIRENT_H_
#define _DIRENT_H_
#include <io.h>
#define PATH_MAX 512
#define __MINGW_NOTHROW
#ifndef RC_INVOKED
#ifdef __cplusplus
extern "C" {
#endif
struct dirent
{
long d_ino; /* Always zero. */
unsigned short d_reclen; /* Always zero. */
unsigned short d_namlen; /* Length of name in d_name. */
char d_name[FILENAME_MAX]; /* File name. */
};
/*
* This is an internal data structure. Good programmers will not use it
* except as an argument to one of the functions below.
* dd_stat field is now int (was short in older versions).
*/
typedef struct
{
/* disk transfer area for this dir */
struct _finddata_t dd_dta;
/* dirent struct to return from dir (NOTE: this makes this thread
* safe as long as only one thread uses a particular DIR struct at
* a time) */
struct dirent dd_dir;
/* _findnext handle */
long dd_handle;
/*
* Status of search:
* 0 = not started yet (next entry to read is first entry)
* -1 = off the end
* positive = 0 based index of next entry
*/
int dd_stat;
/* given path for dir with search pattern (struct is extended) */
char dd_name[PATH_MAX+3];
} DIR;
DIR* __cdecl __MINGW_NOTHROW opendir (const char*);
struct dirent* __cdecl __MINGW_NOTHROW readdir (DIR*);
int __cdecl __MINGW_NOTHROW closedir (DIR*);
void __cdecl __MINGW_NOTHROW rewinddir (DIR*);
long __cdecl __MINGW_NOTHROW telldir (DIR*);
void __cdecl __MINGW_NOTHROW seekdir (DIR*, long);
/* wide char versions */
struct _wdirent
{
long d_ino; /* Always zero. */
unsigned short d_reclen; /* Always zero. */
unsigned short d_namlen; /* Length of name in d_name. */
wchar_t d_name[FILENAME_MAX]; /* File name. */
};
/*
* This is an internal data structure. Good programmers will not use it
* except as an argument to one of the functions below.
*/
typedef struct
{
/* disk transfer area for this dir */
//struct _wfinddata_t dd_dta;
/* dirent struct to return from dir (NOTE: this makes this thread
* safe as long as only one thread uses a particular DIR struct at
* a time) */
struct _wdirent dd_dir;
/* _findnext handle */
long dd_handle;
/*
* Status of search:
* 0 = not started yet (next entry to read is first entry)
* -1 = off the end
* positive = 0 based index of next entry
*/
int dd_stat;
/* given path for dir with search pattern (struct is extended) */
wchar_t dd_name[1];
} _WDIR;
_WDIR* __cdecl __MINGW_NOTHROW _wopendir (const wchar_t*);
struct _wdirent* __cdecl __MINGW_NOTHROW _wreaddir (_WDIR*);
int __cdecl __MINGW_NOTHROW _wclosedir (_WDIR*);
void __cdecl __MINGW_NOTHROW _wrewinddir (_WDIR*);
long __cdecl __MINGW_NOTHROW _wtelldir (_WDIR*);
void __cdecl __MINGW_NOTHROW _wseekdir (_WDIR*, long);
#ifdef __cplusplus
}
#endif
#endif /* Not RC_INVOKED */
#endif /* Not _DIRENT_H_ */

108
compat/win32/dirent.c Normal file
View File

@ -0,0 +1,108 @@
#include "../git-compat-util.h"
#include "dirent.h"
struct DIR {
struct dirent dd_dir; /* includes d_type */
HANDLE dd_handle; /* FindFirstFile handle */
int dd_stat; /* 0-based index */
char dd_name[1]; /* extend struct */
};
DIR *opendir(const char *name)
{
DWORD attrs = GetFileAttributesA(name);
int len;
DIR *p;
/* check for valid path */
if (attrs == INVALID_FILE_ATTRIBUTES) {
errno = ENOENT;
return NULL;
}
/* check if it's a directory */
if (!(attrs & FILE_ATTRIBUTE_DIRECTORY)) {
errno = ENOTDIR;
return NULL;
}
/* check that the pattern won't be too long for FindFirstFileA */
len = strlen(name);
if (is_dir_sep(name[len - 1]))
len--;
if (len + 2 >= MAX_PATH) {
errno = ENAMETOOLONG;
return NULL;
}
p = malloc(sizeof(DIR) + len + 2);
if (!p)
return NULL;
memset(p, 0, sizeof(DIR) + len + 2);
strcpy(p->dd_name, name);
p->dd_name[len] = '/';
p->dd_name[len+1] = '*';
p->dd_handle = INVALID_HANDLE_VALUE;
return p;
}
struct dirent *readdir(DIR *dir)
{
WIN32_FIND_DATAA buf;
HANDLE handle;
if (!dir || !dir->dd_handle) {
errno = EBADF; /* No set_errno for mingw */
return NULL;
}
if (dir->dd_handle == INVALID_HANDLE_VALUE && dir->dd_stat == 0) {
DWORD lasterr;
handle = FindFirstFileA(dir->dd_name, &buf);
lasterr = GetLastError();
dir->dd_handle = handle;
if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
errno = err_win_to_posix(lasterr);
return NULL;
}
} else if (dir->dd_handle == INVALID_HANDLE_VALUE) {
return NULL;
} else if (!FindNextFileA(dir->dd_handle, &buf)) {
DWORD lasterr = GetLastError();
FindClose(dir->dd_handle);
dir->dd_handle = INVALID_HANDLE_VALUE;
/* POSIX says you shouldn't set errno when readdir can't
find any more files; so, if another error we leave it set. */
if (lasterr != ERROR_NO_MORE_FILES)
errno = err_win_to_posix(lasterr);
return NULL;
}
/* We get here if `buf' contains valid data. */
strcpy(dir->dd_dir.d_name, buf.cFileName);
++dir->dd_stat;
/* Set file type, based on WIN32_FIND_DATA */
dir->dd_dir.d_type = 0;
if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
dir->dd_dir.d_type |= DT_DIR;
else
dir->dd_dir.d_type |= DT_REG;
return &dir->dd_dir;
}
int closedir(DIR *dir)
{
if (!dir) {
errno = EBADF;
return -1;
}
if (dir->dd_handle != INVALID_HANDLE_VALUE)
FindClose(dir->dd_handle);
free(dir);
return 0;
}

24
compat/win32/dirent.h Normal file
View File

@ -0,0 +1,24 @@
#ifndef DIRENT_H
#define DIRENT_H
typedef struct DIR DIR;
#define DT_UNKNOWN 0
#define DT_DIR 1
#define DT_REG 2
#define DT_LNK 3
struct dirent {
long d_ino; /* Always zero. */
char d_name[FILENAME_MAX]; /* File name. */
union {
unsigned short d_reclen; /* Always zero. */
unsigned char d_type; /* Reimplementation adds this */
};
};
DIR *opendir(const char *dirname);
struct dirent *readdir(DIR *dir);
int closedir(DIR *dir);
#endif /* DIRENT_H */