root/compat/win32/dirent.c

DEFINITIONS

1. finddata2dirent
2. opendir
3. readdir
4. closedir

#include "../../git-compat-util.h"

struct DIR {
        struct dirent dd_dir; /* includes d_type */
        HANDLE dd_handle;     /* FindFirstFile handle */
        int dd_stat;          /* 0-based index */
};

static inline void finddata2dirent(struct dirent *ent, WIN32_FIND_DATAW *fdata)
{
        /* convert UTF-16 name to UTF-8 */
        xwcstoutf(ent->d_name, fdata->cFileName, sizeof(ent->d_name));

        /* Set file type, based on WIN32_FIND_DATA */
        if (fdata->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
                ent->d_type = DT_DIR;
        else
                ent->d_type = DT_REG;
}

DIR *opendir(const char *name)
{
        wchar_t pattern[MAX_PATH + 2]; /* + 2 for '/' '*' */
        WIN32_FIND_DATAW fdata;
        HANDLE h;
        int len;
        DIR *dir;

        /* convert name to UTF-16 and check length < MAX_PATH */
        if ((len = xutftowcs_path(pattern, name)) < 0)
                return NULL;

        /* append optional '/' and wildcard '*' */
        if (len && !is_dir_sep(pattern[len - 1]))
                pattern[len++] = '/';
        pattern[len++] = '*';
        pattern[len] = 0;

        /* open find handle */
        h = FindFirstFileW(pattern, &fdata);
        if (h == INVALID_HANDLE_VALUE) {
                DWORD err = GetLastError();
                errno = (err == ERROR_DIRECTORY) ? ENOTDIR : err_win_to_posix(err);
                return NULL;
        }

        /* initialize DIR structure and copy first dir entry */
        dir = xmalloc(sizeof(DIR));
        dir->dd_handle = h;
        dir->dd_stat = 0;
        finddata2dirent(&dir->dd_dir, &fdata);
        return dir;
}

struct dirent *readdir(DIR *dir)
{
        if (!dir) {
                errno = EBADF; /* No set_errno for mingw */
                return NULL;
        }

        /* if first entry, dirent has already been set up by opendir */
        if (dir->dd_stat) {
                /* get next entry and convert from WIN32_FIND_DATA to dirent */
                WIN32_FIND_DATAW fdata;
                if (FindNextFileW(dir->dd_handle, &fdata)) {
                        finddata2dirent(&dir->dd_dir, &fdata);
                } else {
                        DWORD lasterr = GetLastError();
                        /* 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;
                }
        }

        ++dir->dd_stat;
        return &dir->dd_dir;
}

int closedir(DIR *dir)
{
        if (!dir) {
                errno = EBADF;
                return -1;
        }

        FindClose(dir->dd_handle);
        free(dir);
        return 0;
}