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ASCII support in z/OS

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From:
Yaroslav Kuzmin
Date:
July 26, 2016 11:43
Subject:
ASCII support in z/OS
Message ID:
1469533413.16923.39.camel@rocketsoftware.com
Hi All,

IBM offers  all tools  build with 'ASCII support' for  USS z/OS.

Overview:
Enhanced ASCII support is a collection of services and options for dealing with the EBCDIC/ASCII
problem. :

    Files can be "tagged" (using chtag ) to indicate whether or not they are pure text files, and if
they are, the character set (CCSID) used to encode them. The typical values will be "1047" (for ibm-
1047) or "819" (for iso8859-1).
    C/C++ programs can be compiled such that all the character and string constants in the program
are compiled into ASCII (or other code page, for that matter), rather than EBCDIC.
    C/C++ programs are marked with a "program CCSID" that indicates the character set the program
uses internally. Note that all programs have a program CCSID,
    Given a tagged file, data can automatically be converted from one code page to another when the
file is read or written.


Documentation:
    Unix System Services Planning
        Chapter 11 (Converting files between code pages), section "Using Enhanced ASCII" (http://www
.ibm.com/support/knowledgecenter/en/SSLTBW_2.2.0/com.ibm.zos.v2r2.bpxb200/uenha.htm), provides an
overview of how to setup and use Enhanced ASCII support.
    Unix System Services (USS z/OS) Command Reference contains details on these commands:
        chtag - query/change the file type (binary/text) and codeset information for a file.
        ls - the -T flag can be used to display file tag information.
        pax - interchange portable archives. pax can record (on archive) and honor (on restore) file
tag information.
        tar - similar to pax. z/OS tar supports processing of file tags.
    XL C/C++ Programming Guide
        Chapter 11 (Performing z/OS UNIX file system I/O operations), section "File tagging and
conversion" (http://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.2.0/com.ibm.zos.v2r2.cbcpx01/cbc
1p273.htm), discusses file tagging, the notion of a program's CCSID, and various facilities related
to enhanced ASCII support
        Chapter 32 "Using environment variables" (http://www.ibm.com/support/knowledgecenter/en/SSLT
BW_2.2.0/com.ibm.zos.v2r2.cbcpx01/setenv.htm) has very good information and descriptions of specific
environment variables (see below).

    XL C/C++ Runtime Library Reference
        Appendix B (Function support table), section "Enhanced ASCII support" (http://www.ibm.com/su
pport/knowledgecenter/en/SSLTBW_2.2.0/com.ibm.zos.v2r2.bpxbd00/enhascii.htm) has a good discussion
of the feature test macros defined for various levels of enhanced ASCII support and a large table
describing the level of support for enhanced ASCII for nearly all runtime functions.
     z/OS Language Environment Programming Reference
        Chapter 2 (Using the Language Environment runtime options) describes the FILETAG runtime
option
    z/OS Language Environment Programming Guide
    This manual describes how to control runtime options using environment variables (_CEE_RUNOPTS)
and compile-time pragmas (#pragma runopts).

    UNIX System Services z/OS Version 1 Release 7 Implementation Redbook, Chapters 10.13 (Enhanced
ASCII functionality), 10.14 (Automatic conversion) and 10.15 (File tagging) are good, but old
(2006).


If all tools will work with ASCII support system, the z/OS can use the ISO-8859-1 character set
(ASCII) instead of IBM-1047 (EBCDIC) and is VERY VERY GOOD.

We are now build bash-4.3 and git-2.4.0 with ASCII support , we test these tools. But to complete
the work git needed  perl c ASCII support. And so we want to build perl with ASCII support.


So :
 1 how to make a branch hints/os390-ascii.sh or in file hints/os390.sh  ?

 2 Should to support two branches perl-zOS-ebcdic и perl-zOS-ascii or only support one perl-zOS-
ascii ?

 3 I have the first progress for version perl-zOS-ascii.



--

Regards,

Yaroslav Kuzmin
Developer C/C++ ,z/OS , Linux
3 Zhukovskiy Street · Miass, Chelyabinsk region 456318 · Russia
Tel:  +7.922.2.38.33.38
Email: YKuzmin@rocketsoftware.com
Web: www.rocketsoftware.com

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