C; storing strings in an array Post: 302643861

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LEARN ABOUT DEBIAN

gd_mfield_list

gd_mfield_list(3)						      GETDATA							 gd_mfield_list(3)

NAME

       gd_mfield_list -- retrieve a list of fields in a dirfile

SYNOPSIS

       #include <getdata.h>

       const char **gd_mfield_list(DIRFILE *dirfile, const char *parent);

DESCRIPTION

       The  gd_mfield_list()  function	queries  a  dirfile(5)	database  specified  by  dirfile  and returns a read-only list of names of the all
       metafields for the specified parent field in the database.

       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_nmfields(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_mfield_list() is called again with the same arguments, or until the array is de-allocated by a call to
       gd_close(3).

RETURN VALUE

       Upon successful completion, gd_mfield_list() returns a pointer to an array of strings containing the names of all  the  metafields  of  the
       given parent.  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_CODE
	       The supplied parent field code was not found, or referred to a metafield itself.

       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_mfield_list_by_type(3), gd_mvector_list(3), gd_nfields(3)

Version 0.7.0							  15 October 2010						 gd_mfield_list(3)