put_string (3) - Linux Manuals

put_string: retrieve a string from a dirfile database


put_string --- retrieve a string from a dirfile database


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


The 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 dirfile_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 dirfile_metaflush(3), or until the dirfile is closed.


On success, 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 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 putdata(3), or put_constant(3) instead.
The representation suffix specified in field_code was not recognised.
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 get_error(3). A descriptive error string for the last error encountered may be obtained from a call to get_error_string(3).