03-11-2020
@nezabudka: You are right if the last field is well-formed, i.e. >= 4 chars. Compare the versions for the case of last field < 4 char...
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LEARN ABOUT DEBIAN
gd_reference
gd_reference(3) GETDATA gd_reference(3)
NAME
gd_reference -- retrieve or set the reference field for a dirfile
SYNOPSIS
#include <getdata.h>
const char *gd_reference(DIRFILE *dirfile, const char *field_code);
DESCRIPTION
The gd_reference() function sets or retrieves the reference field (see dirfile(5)) associated with the dirfile specified by dirfile. If
the field_code argument is non-NULL, the reference field for the dirfile will be set to the field specified. If field_code is NULL, the
reference field is not modified. The field code should refer to a RAW field, and may not contain a representation suffix.
RETURN VALUE
On success, gd_reference() returns the field code of the dirfile's reference field, which will be field_code, if field_code is non-NULL.
If no RAW fields are defined in the dirfile, this function will return NULL, without raising an error. On error, NULL 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
The field specified by field_code was not a RAW field.
GD_E_PROTECTED
The metadata of the primary format specification fragment (the file named format in the root dirfile directory) was protected from
change.
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).
SEE ALSO
gd_metaflush(3), gd_open(3), gd_error(3), gd_error_string(3), dirfile(5), dirfile-format(5)
Version 0.7.0 20 July 2010 gd_reference(3)