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d1b6e6e015
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>
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
#include "../git-compat-util.h"
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#include "dirent.h"
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struct DIR {
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struct dirent dd_dir; /* includes d_type */
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HANDLE dd_handle; /* FindFirstFile handle */
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int dd_stat; /* 0-based index */
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char dd_name[1]; /* extend struct */
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};
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DIR *opendir(const char *name)
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{
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DWORD attrs = GetFileAttributesA(name);
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int len;
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DIR *p;
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/* check for valid path */
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if (attrs == INVALID_FILE_ATTRIBUTES) {
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errno = ENOENT;
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return NULL;
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}
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/* check if it's a directory */
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if (!(attrs & FILE_ATTRIBUTE_DIRECTORY)) {
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errno = ENOTDIR;
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return NULL;
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}
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/* check that the pattern won't be too long for FindFirstFileA */
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len = strlen(name);
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if (is_dir_sep(name[len - 1]))
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len--;
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if (len + 2 >= MAX_PATH) {
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errno = ENAMETOOLONG;
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return NULL;
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}
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p = malloc(sizeof(DIR) + len + 2);
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if (!p)
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return NULL;
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memset(p, 0, sizeof(DIR) + len + 2);
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strcpy(p->dd_name, name);
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p->dd_name[len] = '/';
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p->dd_name[len+1] = '*';
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p->dd_handle = INVALID_HANDLE_VALUE;
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return p;
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}
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struct dirent *readdir(DIR *dir)
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{
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WIN32_FIND_DATAA buf;
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HANDLE handle;
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if (!dir || !dir->dd_handle) {
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errno = EBADF; /* No set_errno for mingw */
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return NULL;
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}
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if (dir->dd_handle == INVALID_HANDLE_VALUE && dir->dd_stat == 0) {
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DWORD lasterr;
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handle = FindFirstFileA(dir->dd_name, &buf);
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lasterr = GetLastError();
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dir->dd_handle = handle;
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if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
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errno = err_win_to_posix(lasterr);
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return NULL;
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}
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} else if (dir->dd_handle == INVALID_HANDLE_VALUE) {
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return NULL;
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} else if (!FindNextFileA(dir->dd_handle, &buf)) {
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DWORD lasterr = GetLastError();
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FindClose(dir->dd_handle);
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dir->dd_handle = INVALID_HANDLE_VALUE;
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/* POSIX says you shouldn't set errno when readdir can't
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find any more files; so, if another error we leave it set. */
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if (lasterr != ERROR_NO_MORE_FILES)
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errno = err_win_to_posix(lasterr);
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return NULL;
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}
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/* We get here if `buf' contains valid data. */
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strcpy(dir->dd_dir.d_name, buf.cFileName);
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++dir->dd_stat;
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/* Set file type, based on WIN32_FIND_DATA */
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dir->dd_dir.d_type = 0;
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if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
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dir->dd_dir.d_type |= DT_DIR;
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else
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dir->dd_dir.d_type |= DT_REG;
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return &dir->dd_dir;
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}
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int closedir(DIR *dir)
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{
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if (!dir) {
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errno = EBADF;
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return -1;
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}
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if (dir->dd_handle != INVALID_HANDLE_VALUE)
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FindClose(dir->dd_handle);
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free(dir);
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return 0;
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}
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