0001 BVNULL(3)
0002 =========
0003 :doctype: manpage
0004
0005
0006 NAME
0007 ----
0008 Bvnull - Test is structure field have a NULL value according to the view
0009
0010
0011 SYNOPSIS
0012 --------
0013
0014 #include <ubf.h>
0015
0016 int Bvnull(char *'cstruct', char *'cname', BFLDOCC 'occ', char *'view');
0017
0018 Link with '-lubf -lnstd -lm -lpthread'
0019
0020 DESCRIPTION
0021 -----------
0022
0023 Test is field in structure NULL. The tests are done by comparing the field value
0024 with 'NULL' value column defined in view file. Note that if 'NULL' was set to
0025 *NONE*, then function will always return *FALSE*. The pointer to structure
0026 is given in 'cstruct'. The field name is specified in 'cname'. The array element
0027 index (zero based) is passed in 'occ' field. If 'COUNT' is set to 1 in view file,
0028 then field is tested via occ set to *0*.
0029
0030 RETURN VALUE
0031 ------------
0032 If field is NULL, *Bvnull()* return *1*; If field is no NULL, function returns *0*;
0033 on error, -1 is returned, with *Berror* set to indicate the error.
0034
0035 ERRORS
0036 ------
0037 Note that *Bstrerror()* returns generic error message plus custom message with
0038 debug info from last function call.
0039
0040 *BEINVAL* Invalid value passed to function, parameters are NULL or invalid 'occ'
0041 index.
0042
0043 *BNOCNAME* Invalid 'cname' specified (field not found).
0044
0045 *BBADVIEW* View is not found, object file is defective or system error.
0046
0047
0048 EXAMPLE
0049 -------
0050 See *atmitest/test040_typedview/viewunit1.c* for sample code.
0051
0052 BUGS
0053 ----
0054 Report bugs to support@mavimax.com
0055
0056 SEE ALSO
0057 --------
0058 *viewc(8)* *Bvstof(3)* *Bvftos(3)* *Bvsinit(3)* *Bvselinit(3)* *Bvnull(3)* *ex_env(5)*
0059 *Bupdate(3)* *Bconcat(3)*
0060
0061 COPYING
0062 -------
0063 (C) Mavimax, Ltd
0064
