gd_put_string(3) retrieve a string from a dirfile database


#include <getdata.h>
int gd_put_string(DIRFILE *dirfile, const char *field_code, const char *data_in);


The gd_put_string() function queries a dirfile(5) database specified by dirfile and sets the STRING field_code , which should not contain a representation suffix, to the value specified in data_in.

The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3).

Because string values are stored in the dirfile metadata, the new value of field_code won't be written to disk until the dirfile metadata is flushed with gd_metaflush(3), or until the dirfile is closed.


On success, gd_put_string() returns the length of the string stored, including the trailing NUL character. On error, it returns 0 and sets the dirfile error to a non-zero value. Possible error values are:
The specified dirfile was opened read-only.
The field specified by field_code was not found in the database.
An invalid dirfile was supplied.
The supplied field_code referred to a field of type other than STRING. The caller should use gd_putdata(3), gd_put_carray(3), or gd_put_constant(3) instead.
An invalid data_type was specified.
An internal error occurred in the library while trying to perform the task. This indicates a bug in the library. Please report the incident to the maintainer.
The fragment containing the string was protected from change.

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