compat/win32/dirent.c

   1 #include "../../git-compat-util.h"
   2
   3 struct DIR {
   4         struct dirent dd_dir; /* includes d_type */
   5         HANDLE dd_handle;     /* FindFirstFile handle */
   6         int dd_stat;          /* 0-based index */
   7 };
   8
   9 static inline void finddata2dirent(struct dirent *ent, WIN32_FIND_DATAA *fdata)
  10 {
  11         /* copy file name from WIN32_FIND_DATA to dirent */
  12         memcpy(ent->d_name, fdata->cFileName, sizeof(ent->d_name));
  13
  14         /* Set file type, based on WIN32_FIND_DATA */
  15         if (fdata->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
  16                 ent->d_type = DT_DIR;
  17         else
  18                 ent->d_type = DT_REG;
  19 }
  20
  21 DIR *opendir(const char *name)
  22 {
  23         char pattern[MAX_PATH];
  24         WIN32_FIND_DATAA fdata;
  25         HANDLE h;
  26         int len;
  27         DIR *dir;
  28
  29         /* check that name is not NULL */
  30         if (!name) {
  31                 errno = EINVAL;
  32                 return NULL;
  33         }
  34         /* check that the pattern won't be too long for FindFirstFileA */
  35         len = strlen(name);
  36         if (len + 2 >= MAX_PATH) {
  37                 errno = ENAMETOOLONG;
  38                 return NULL;
  39         }
  40         /* copy name to temp buffer */
  41         memcpy(pattern, name, len + 1);
  42
  43         /* append optional '/' and wildcard '*' */
  44         if (len && !is_dir_sep(pattern[len - 1]))
  45                 pattern[len++] = '/';
  46         pattern[len++] = '*';
  47         pattern[len] = 0;
  48
  49         /* open find handle */
  50         h = FindFirstFileA(pattern, &fdata);
  51         if (h == INVALID_HANDLE_VALUE) {
  52                 DWORD err = GetLastError();
  53                 errno = (err == ERROR_DIRECTORY) ? ENOTDIR : err_win_to_posix(err);
  54                 return NULL;
  55         }
  56
  57         /* initialize DIR structure and copy first dir entry */
  58         dir = xmalloc(sizeof(DIR));
  59         dir->dd_handle = h;
  60         dir->dd_stat = 0;
  61         finddata2dirent(&dir->dd_dir, &fdata);
  62         return dir;
  63 }
  64
  65 struct dirent *readdir(DIR *dir)
  66 {
  67         if (!dir) {
  68                 errno = EBADF; /* No set_errno for mingw */
  69                 return NULL;
  70         }
  71
  72         /* if first entry, dirent has already been set up by opendir */
  73         if (dir->dd_stat) {
  74                 /* get next entry and convert from WIN32_FIND_DATA to dirent */
  75                 WIN32_FIND_DATAA fdata;
  76                 if (FindNextFileA(dir->dd_handle, &fdata)) {
  77                         finddata2dirent(&dir->dd_dir, &fdata);
  78                 } else {
  79                         DWORD lasterr = GetLastError();
  80                         /* POSIX says you shouldn't set errno when readdir can't
  81                            find any more files; so, if another error we leave it set. */
  82                         if (lasterr != ERROR_NO_MORE_FILES)
  83                                 errno = err_win_to_posix(lasterr);
  84                         return NULL;
  85                 }
  86         }
  87
  88         ++dir->dd_stat;
  89         return &dir->dd_dir;
  90 }
  91
  92 int closedir(DIR *dir)
  93 {
  94         if (!dir) {
  95                 errno = EBADF;
  96                 return -1;
  97         }
  98
  99         FindClose(dir->dd_handle);
 100         free(dir);
 101         return 0;
 102 }