+// Return the type of an open file
+//
+// Some file types on some platforms seem seekable but in fact are not.
+// The main use of this function is to allow such cases to be detected
+// (IsSeekable() is implemented as wxGetFileKind() == wxFILE_KIND_DISK).
+//
+// This is important for the archive streams, which benefit greatly from
+// being able to seek on a stream, but which will produce corrupt archives
+// if they unknowingly seek on a non-seekable stream.
+//
+// wxFILE_KIND_DISK is a good catch all return value, since other values
+// disable features of the archive streams. Some other value must be returned
+// for a file type that appears seekable but isn't.
+//
+// Known examples:
+// * Pipes on Windows
+// * Files on VMS with a record format other than StreamLF
+//
+wxFileKind wxGetFileKind(int fd)
+{
+#if defined __WXMSW__ && !defined __WXWINCE__ && defined wxGetOSFHandle
+ switch (::GetFileType(wxGetOSFHandle(fd)) & ~FILE_TYPE_REMOTE)
+ {
+ case FILE_TYPE_CHAR:
+ return wxFILE_KIND_TERMINAL;
+ case FILE_TYPE_DISK:
+ return wxFILE_KIND_DISK;
+ case FILE_TYPE_PIPE:
+ return wxFILE_KIND_PIPE;
+ }
+
+ return wxFILE_KIND_UNKNOWN;
+
+#elif defined(__UNIX__)
+ if (isatty(fd))
+ return wxFILE_KIND_TERMINAL;
+
+ struct stat st;
+ fstat(fd, &st);
+
+ if (S_ISFIFO(st.st_mode))
+ return wxFILE_KIND_PIPE;
+ if (!S_ISREG(st.st_mode))
+ return wxFILE_KIND_UNKNOWN;
+
+ #if defined(__VMS__)
+ if (st.st_fab_rfm != FAB$C_STMLF)
+ return wxFILE_KIND_UNKNOWN;
+ #endif
+
+ return wxFILE_KIND_DISK;
+
+#else
+ #define wxFILEKIND_STUB
+ (void)fd;
+ return wxFILE_KIND_DISK;
+#endif
+}
+
+wxFileKind wxGetFileKind(FILE *fp)
+{
+ // Note: The watcom rtl dll doesn't have fileno (the static lib does).
+ // Should be fixed in version 1.4.
+#if defined(wxFILEKIND_STUB) || \
+ (defined(__WATCOMC__) && __WATCOMC__ <= 1230 && defined(__SW_BR))
+ (void)fp;
+ return wxFILE_KIND_DISK;
+#else
+ return fp ? wxGetFileKind(fileno(fp)) : wxFILE_KIND_UNKNOWN;
+#endif
+}
projects / wxWidgets.git / blobdiff