gd_move(3)

NAME
gd_move — move a dirfile field between format specification fragments

SYNOPSIS
#include <getdata.h>

int gd_move(DIRFILE *dirfile, const char *field_code, int new_fragment, int move_data);

DESCRIPTION
The gd_move() function transfers the field specified by field_code, which should not have a representation suffix, defined in the dirfile specified by dirfile from it's current format specification fragment to the fragment index by new_fragment. If the field is already defined in the fragment index by new_fragment, this function does nothing.

If the flag move_data is non-zero, and field_code specifies a RAW field, the binary file associated with the field will be translated to account for the possibly different encoding, endianness, and frame offset of the new format specification fragment. It will also be moved to a new directory, if necessary. If move_data is zero, no changes will be made to the binary file. If field_code specifies a field of type other than RAW, the move_data flag is ignored.

If the binary file is translated, and the frame offset of the destination fragment is larger than that of the source fragment, this will result in permanent deletion of data from the database. If the new frame offset is smaller than the old frame offset, the binary file will be padded at the front with zeroes.

RETURN VALUE
On success, gd_move() returns zero. On error, -1 is returned and the dirfile error is set to a non-zero error value. Possible error values are:

GD_E_ACCMODE
    The specified dirfile was opened read-only.

GD_E_ALLOC
    The library was unable to allocate memory.

GD_E_BAD_CODE
    The field specified by field_code was not found.

GD_E_BAD_DIRFILE
    The supplied dirfile was invalid.

GD_E_BAD_FIELD_TYPE
    An attempt was made to move the immutable INDEX field.

GD_E_BAD_INDEX
    The new_fragment argument did not index a valid format specification fragment.

GD_E_PROTECTED
    The metadata of the source or destination format specification fragments was protected from change, or the binary data of the source or destination fragments was protected from change and binary file translation was requested.

GD_E_RAW_IO
    An I/O error occurred while attempting to translate a binary file.

GD_E_UNKNOWN_ENCODING
    The encoding scheme of the source or destination fragment is unknown.

GD_E_UNSUPPORTED
    The encoding scheme of the source or destination fragment does not support binary file translation.

The dirfile error may be retrieved by calling gd_error(3). A descriptive error string for the last error encountered can be obtained from a call to gd_error_string(3).

NOTES
A binary file translation occurs out-of-place. As a result, sufficient space must be present on the filesystem for both the binary file before translation and the binary file after translation.

SEE ALSO
gd_metaflush(3), gd_open(3), gd_error(3), gd_error_string(3), dirfile(5), dirfile-format(5)