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https://github.com/git-for-windows/git.git
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b08f49f5ec
Emulating the POSIX `dirent` API on Windows via `FindFirstFile()`/`FindNextFile()` is pretty staightforward, however, most of the information provided in the `WIN32_FIND_DATA` structure is thrown away in the process. A more sophisticated implementation may cache this data, e.g. for later reuse in calls to `lstat()`. Make the `dirent` implementation pluggable so that it can be switched at runtime, e.g. based on a config option. Define a base DIR structure with pointers to `readdir()`/`closedir()` that match the `opendir()` implementation (similar to vtable pointers in Object-Oriented Programming). Define `readdir()`/`closedir()` so that they call the function pointers in the `DIR` structure. This allows to choose the `opendir()` implementation on a call-by-call basis. Make the fixed-size `dirent.d_name` buffer a flex array, as `d_name` may be implementation specific (e.g. a caching implementation may allocate a `struct dirent` with _just_ the size needed to hold the `d_name` in question). Signed-off-by: Karsten Blees <blees@dcon.de> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
#include "../../git-compat-util.h"
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wpedantic"
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typedef struct dirent_DIR {
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struct DIR base_dir; /* extend base struct DIR */
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HANDLE dd_handle; /* FindFirstFile handle */
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int dd_stat; /* 0-based index */
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struct dirent dd_dir; /* includes d_type */
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} dirent_DIR;
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#pragma GCC diagnostic pop
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DIR *(*opendir)(const char *dirname) = dirent_opendir;
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static inline void finddata2dirent(struct dirent *ent, WIN32_FIND_DATAW *fdata)
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{
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/* convert UTF-16 name to UTF-8 (d_name points to dirent_DIR.dd_name) */
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xwcstoutf(ent->d_name, fdata->cFileName, MAX_PATH * 3);
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/* Set file type, based on WIN32_FIND_DATA */
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if (fdata->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
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ent->d_type = DT_DIR;
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else
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ent->d_type = DT_REG;
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}
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static struct dirent *dirent_readdir(dirent_DIR *dir)
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{
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if (!dir) {
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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 first entry, dirent has already been set up by opendir */
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if (dir->dd_stat) {
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/* get next entry and convert from WIN32_FIND_DATA to dirent */
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WIN32_FIND_DATAW fdata;
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if (FindNextFileW(dir->dd_handle, &fdata)) {
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finddata2dirent(&dir->dd_dir, &fdata);
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} else {
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DWORD lasterr = GetLastError();
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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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}
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++dir->dd_stat;
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return &dir->dd_dir;
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}
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static int dirent_closedir(dirent_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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FindClose(dir->dd_handle);
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free(dir);
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return 0;
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}
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DIR *dirent_opendir(const char *name)
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{
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wchar_t pattern[MAX_PATH + 2]; /* + 2 for '/' '*' */
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WIN32_FIND_DATAW fdata;
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HANDLE h;
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int len;
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dirent_DIR *dir;
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/* convert name to UTF-16 and check length < MAX_PATH */
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if ((len = xutftowcs_path(pattern, name)) < 0)
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return NULL;
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/* append optional '/' and wildcard '*' */
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if (len && !is_dir_sep(pattern[len - 1]))
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pattern[len++] = '/';
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pattern[len++] = '*';
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pattern[len] = 0;
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/* open find handle */
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h = FindFirstFileW(pattern, &fdata);
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if (h == INVALID_HANDLE_VALUE) {
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DWORD err = GetLastError();
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errno = (err == ERROR_DIRECTORY) ? ENOTDIR : err_win_to_posix(err);
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return NULL;
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}
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/* initialize DIR structure and copy first dir entry */
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dir = xmalloc(sizeof(dirent_DIR) + MAX_PATH);
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dir->base_dir.preaddir = (struct dirent *(*)(DIR *dir)) dirent_readdir;
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dir->base_dir.pclosedir = (int (*)(DIR *dir)) dirent_closedir;
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dir->dd_handle = h;
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dir->dd_stat = 0;
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finddata2dirent(&dir->dd_dir, &fdata);
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return (DIR*) dir;
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}
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