table of contents
gd_dirfile_standards — change or report the current Dirfile Standards Version for a DirFile
int gd_dirfile_standards(DIRFILE *dirfile, int version);
The gd_dirfile_standards() function sets the current Standards Version for the open dirfile dirfile to the value specified by version, determining the syntax used to write metadata to disk for dirfile.
The Standards Version of the loaded dirfile also affects the operation of functions which add fields, such as dirfile_add(3) or dirfile_add_spec(3); and functions which modify field metadata, such as dirfile_alter_entry(3) or dirfile_alter_spec(3). For specific behaviour see the manual page of the appropriate function.
The version parameter should be between zero and the value of the symbol GD_DIRFILE_STANDARDS_VERSION, which is the newest Standards Version understood by GetData, inclusive, or else one of the following special symbols:
- Specifies the current Standards Version should be set to the earliest version that supports all the features of the loaded dirfile;
- Specifies that the current Standards Version should not be changed. In this case, this function simply reports the current Standards Version;
- Specifies the current Standards Version should be set to the latest
version that supports all the features of the loaded dirfile;
If the loaded dirfile does not conform to the specified version, this function fails, and the current Standards Version is unchanged. If the loaded dirfile conforms to no known Standards Version, this function will fail regardless of the value of version (even if GD_VERSION_CURRENT is used).
The caller should not assume that the loaded dirfile conforms to every Standards Version between the values reported by GD_VERSION_EARLIEST and GD_VERSION_LATEST.
On success, gd_dirfile_standards() returns the current Standards Version of the loaded dirfile, after possibly having been updated by the call. This will be a non-negative integer between zero and GD_DIRFILE_STANDARDS_VERSION inclusive. On error, a negative-valued error code is returned, and the current Standards Version is not changed. Possible error codes are:
- The loaded dirfile did not conform to the specified version. Or the dirfile conforms to no known Standards Version.
- The supplied dirfile was invalid.
The error code is also stored in the DIRFILE object and may be retrieved after this function returns by calling gd_error(3). A descriptive error string for the error may be obtained by calling gd_error_string(3).
This function only changes the current Standards Version of the loaded dirfile. It does not update the any format specification fragments on disk to conform to the specified Standards Version. To do that, use gd_metaflush(3) or gd_rewrite_fragment(3).
The function gd_dirfile_standards() appeared in GetData-0.7.0.
In GetData-0.10.0, the error return from this function changed from -1 to a negative-valued error code.
|25 December 2016||Version 0.10.0|