gd_verbose_prefix man page

gd_verbose_prefix — set the prefix on error messages printed by GetData


#include <getdata.h>

int gd_verbose_prefix(DIRFILE *dirfile, const char *prefix);


The gd_verbose_prefix() sets the prefix printed before error messages output by the GetData library for the dirfile(5) database specified by dirfile. If prefix is NULL, the current prefix (if any) is deleted and no new prefix is saved.

GetData only prints error messages for a given Dirfile if opened along with the GD_VERBOSE flag, or if the flag has been subsequently set on the dirfile using gd_flags(3). If this flag is not set, this function still updates the prefix, but GetData does not use it.

If GD_VERBOSE is set, when the library encounters an error, it prints the supplied prefix (if any), followed immediately by the error message (which is the message returned by gd_error_string(3)), followed by a newline.  All output goes to the caller's standard error (stderr(3)).

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

Return Value

Upon successful completion, gd_verbose_prefix() returns zero.  On error, it returns a negative-valued error code.  Possible error codes are:


The library was unable to allocate memory.

The error code is also stored in the DIRFILE object and may be retrieved after this function returns by calling gd_error(3). A descriptive error string for the error may be obtained by calling gd_error_string(3).


The gd_verbose_prefix() function appared in GetData-0.8.0.

In GetData-0.10.0, the error return from this function changed from -1 to a negative-valued error code.

See Also

gd_error(3), gd_error_string(3), gd_flags(3), gd_open(3), stderr(3), dirfile(5)

Referenced By

gd_flags(3), gd_open(3).

25 December 2016 Version 0.10.0 GETDATA