The following functions provide an interface to extract and manipulate
the header entry (see Filling in the Header Entry) from a file loaded in memory.
The meta information must be written back into the domain message with
the empty string as msgid.
const char * po_file_domain_header (po_file_t file, const char *domain) ¶Returns the header entry of a domain from file, a PO file loaded in
memory. The value NULL provided as domain denotes the
default domain. Returns NULL if there is no header entry.
char * po_header_field (const char *header, const char *field) ¶Returns the value of field in the header entry. The return
value is either a freshly allocated string, to be freed by the caller,
or NULL.
char * po_header_set_field (const char *header, const char *field, const char *value) ¶Returns a freshly allocated string which contains the entry from header with field set to value. The field is added if necessary.