gd_invalid_dirfile(3) [debian man page]

gd_invalid_dirfile(3)						      GETDATA						     gd_invalid_dirfile(3)

NAME

       gd_invalid_dirfile -- obtain an pointer to an invalid DIRFILE object

SYNOPSIS

       #include <getdata.h>

       DIRFILE* gd_invalid_dirfile(void);

DESCRIPTION

       The  gd_invalid_dirfile()  returns  a  pointer  to  a  newly allocated, invalid DIRFILE object.	Like any other DIRFILE object, the invalid
       DIRFILE object should be de-allocated by calling gd_close(3) or gd_discard(3) when it is no longer needed.

       The DIRFILE object returned may be passed to any other GetData function which requires one, but doing so will  inevitably  result  in  that
       function failing with the GD_BAD_DIRFILE error.

       A similar effect can be achieved by making an invalid gd_open(3) call, such as:

		gd_open("", 0);

       which  also  returns  a pointer to an invalid DIRFILE object.  The difference is that an invalid DIRFILE created in this way has a non-zero
       dirfile error (obtainable with gd_error(3)), while the dirfile error of the invalid DIRFILE returned by gd_invalid_dirfile(3) is zero  (in-
       dicating success).

RETURN VALUE

       This function always returns a pointer to a newly allocated, invalid DIRFILE object.

SEE ALSO

       gd_close(3), gd_discard(3), gd_error(3), gd_open(3)

Version 0.7.0							  20 October 2010					     gd_invalid_dirfile(3)

gd_vector_list(3)						      GETDATA							 gd_vector_list(3)

NAME

       gd_vector_list -- retrieve a list of vector fields in a dirfile

SYNOPSIS

       #include <getdata.h>

       const char **gd_vector_list(DIRFILE *dirfile);

DESCRIPTION

       The  gd_vector_list()  function	queries a dirfile(5) database specified by dirfile and returns a read-only list of names of the all vector
       type fields defined in the database (i.e.  fields of types BIT, LINCOM, LINTERP, MULTIPLY, PHASE, POLYNOM, RAW, SBIT).  Notably, this  list
       does not include /META subfields.

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

       The  array  returned  will be de-allocated by a call to gd_close(3) and should not be de-allocated by the caller.  The list returned should
       not be assumed to be in any particular order.  The array is terminated by a NULL pointer.  The number of strings in the array  can  be  ob-
       tained from a call to gd_nvectors(3).

       The  caller may not modify any strings in the array, or the array itself.  Doing so may cause database corruption.  The pointer returned is
       guaranteed to be valid until gd_vector_list() is called again on the same DIRFILE object, or until the array is de-allocated by a  call	to
       gd_close(3).

RETURN VALUE

       Upon successful completion, gd_vector_list() returns a pointer to an array of strings containing the names of all the vector fields defined
       in the dirfile database.  On error it returns NULL and sets the dirfile error to a non-zero error value.  Possible error values are:

       GD_E_ALLOC
	       The library was unable to allocate memory.

       GD_E_BAD_DIRFILE
	       The supplied dirfile was invalid.

       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

       dirfile(5), gd_open(3), gd_error(3), gd_error_string(3), gd_field_list(3), gd_mvector_list(3), gd_nvectors(3)

Version 0.7.0							  15 October 2010						 gd_vector_list(3)