TNS/R Native Application Migration Guide

C and C++ Migration Tasks

TNS/R Native Application Migration Guide—523745-001

3-8

Replacing Obsolete Keywords

D-series TNS C compilers recognize but issue warnings for certain C-series keywords

with D-series replacements. The native C compiler does not recognize the C-series

keywords. Replace the following C-series keywords with the equivalent D-series

keywords:

The extptr keywords identify 32-bit pointers in external function declarations for TAL.

Native programs only support 32-bit pointers, so this keyword is unnecessary. Delete

the extptr keyword.

Changing Use of _cc_status for Return Values

_cc_status is used for calls to Guardian and TAL procedures that set a condition-

code register instead of returning a value. For TNS C and C++ programs, the CCL,

CCE, and CCG macros examine the results of a function declared with the

_cc_status type specifier. For native C and C++ programs, you must replace these

macros with the _status_lt(x), _status_eq(x), and _status_gt(x) macros.

These new macros are defined in the tal.h header and can be used in TNS and

native programs. These macros are:

•

For TNS/R native C and C++:

#define _status_lt(x) ((x) < 0)

#define _status_eq(x) ((x) == 0)

#define _status_gt(x) ((x) > 0)

•

For TNS C and C++:

#define _status_lt(x) ((x) == 2)

#define _status_eq(x) ((x) == 1)

#define _status_gt(x) ((x) == 0)

Example 3-1 on page 3-9 shows the difference between using the new macros defined

at D40 and those used prior to D40 to examine _cc_status.

C-Series Keyword D-Series Keyword

cc_status _cc_status

extensible _extensible

extptr See the following paragraph.

lowmem _lowmem

tal _tal

variable _variable

myproc ="alias-name" _alias("alias-name") myproc

(or use the FUNCTION pragma syntax instead—see C/C++

Programmer’s Guide for more information)