LINESIZE.REX

From Rosetta Code

The   LINESIZE.REX   is a REXX program to emulate the   linesize   BIF for some REXX programs.


The help for the   LINESIZE   REXX program is included here ──► LINESIZE.HEL.

/*REXX program find the  LINESIZE  (of the console/terminal)  when in MS Windows or DOS.*/
 
trace off
 
 
/*┌────────────────────────────────────────────────────────────────────┐
┌─┘ └─┐
│ support the LINESIZE built-in function. │
│ │
│ The following REXXes (and others) support the LINESIZE as a BIF: │
│ │
│ CMS │
│ PC/REXX │
│ Personal REXX │
│ R4 │
│ ROO │
│ TSO │
│ │
│ Method: to save time, this program first attempts to find the DOS │
│ environmental variable LINES. Failing that, it then parses the result │
│ from the MODE CON (DOS) command and scans for the COLUMNS text. │
└─┐ ┌─┘
└────────────────────────────────────────────────────────────────────┘*/

 
 
parse arg !
if !all(arg()) then exit
if !cms then address ''
 
signal on halt
signal on noValue
signal on syntax
 
 
if \!dos then return 24 80 /*not DOS? Return default. */
 
@abc= 'abcdefghijklmnopqrstuvwxyz'
@erase = 'ERASE' /*point to the DOS ERASE cmd.*/
@find = 'FIND' /* " " " " FIND " */
@MODE = 'MODE' /* " " " " MODE " */
tfid= /*name of a temporary fileID.*/
 
/*Note: /i = ignore case. */
@find_col = '/i "column"' /*find a line with COLUMN. */
 
findLines= 1
sw= 0
 
 
parse var !! _ . '(' ops ')' __
if _\=='' | __\=='' then call er 59
ops= space(ops)
 
do while ops\==''
parse var ops _1 2 1 _ . 1 _o ops
upper _
 
select
when _==',' then nop
when _1==. & pos("=",_)\==0 then tops= tops _o
when abbn('SCRWIDths' )|,
abbn('WIDths' )|,
abbn('WIDes' )|,
abbn('WIDs' )|,
abbn('COLumns' )|,
abbn('COLs' ) then findLines= no()
otherwise call er 55,_o
end /*select*/
 
end /*while*/
 
 
/*attempt to use the DOS */
/* environmental variable: */
/* LINES */
if findLines then do
sd= word( !var('LINES'), 1) /*pick off the first word. */
if \isInt(sd) then sd= 0 /*Not a whole #? Then use 0 */
sd= sd / 1 /*Has a decimal point? Remove*/
end
 
/*if above not defined, then */
/* use the (DOS) MODE cmd.*/
if sw==0 then do /*Not defined? Then use MODE*/
if !regina then call regina
else call hardWay
end
 
if sw==0 then sw= 80 /*just in case MODE failed.*/
/*use positive values. */
return abs(sw) /*return width. */
 
 
/*──────────────────────────────────────────────────────────────────────────────────────*/
regina: $.= /*assign default value. */
address system @mode 'CON: |' @find @find_col with output stem $.
if $.0=='' then $.0= 0 /*in case ADDRESS failed. */
 
do j=1 for $.0 /*process all the responses. */
_= translate( $.j, ,'=:') /*translate = : ──> blanks. */
parse upper var _ yname yval . /*parse with name value. */
if yname=='COLUMNS' then sw= yval /*if COLUMNS, it's width. */
end /*j*/
 
return /*return the screen width. */
 
 
/*──────────────────────────────────────────────────────────────────────────────────────*/
hardWay: /*use MODE CON to find LINES*/
call gettfid ,'$$$' /*get a TEMP id:  !fn $$$ */
 
@mode 'CON: |' @find @find_col '>' tfid /*issue MODE CON | filter>fid*/
 
call linein tfid,1,0 /*point to record 1. */
 
do while sw==0 /*read file while sw | sw =0 */
if lines(tfid)==0 then leave /*No lines left? We're done. */
_= translate( linein(tfid), ,'=:') /*translate = : ──> blanks. */
parse upper var _ yname yval . /*parse with name value. */
if yname=='COLUMNS' then sw= yval /*if COLUMNS, it's width. */
end /*while*/
 
@erase tfid /*erase the temp. file. */
return /*return the screen width. */
 
 
/*═════════════════════════════general 1─line subs══════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════*/
!all:  !!=!;!=space(!);upper !;call !fid;!nt=right(!var('OS'),2)=='NT';!cls=word('CLS VMFCLEAR CLRSCREEN',1+!cms+!tso*2);if arg(1)\==1 then return 0;if wordpos(!,'? ?SAMPLES ?AUTHOR ?FLOW')==0 then return 0;!call=']$H';call '$H' !fn !;!call=;return 1
!cal: if symbol('!CALL')\=="VAR" then !call=; return !call
!env:  !env='ENVIRONMENT'; if !sys=='MSDOS' | !brexx | !r4 | !roo then !env='SYSTEM'; if !os2 then !env='OS2'!env; !ebcdic= 3=='f3'x; if !crx then !env='DOS'; return
!fid: parse upper source !sys !fun !fid . 1 . . !fn !ft !fm .; call !sys; if !dos then do; _= lastpos('\', !fn); !fm= left(!fn, _); !fn= substr(!fn, _ + 1); parse var !fn !fn '.' !ft; end; return word(0 !fn !ft !fm, 1 + ('0'arg(1) ) )
!rex: parse upper version !ver !vernum !verdate .; !brexx= 'BY'==!vernum; !kexx= 'KEXX'==!ver; !pcrexx= 'REXX/PERSONAL'==!ver | 'REXX/PC'==!ver; !r4= 'REXX-R4'==!ver; !regina= 'REXX-REGINA'==left(!ver, 11); !roo= 'REXX-ROO'==!ver; call !env; return
!sys:  !cms= !sys=='CMS';  !os2= !sys=='OS2';  !tso= !sys=='TSO' | !sys=='MVS'; !vse= !sys=='VSE'; !dos= pos('DOS', !sys)\==0 | pos('WIN', !sys)\==0 | !sys=='CMD'; !crx= left(!sys, 6)=='DOSCRX'; call !rex; return
!var: call !fid; if !kexx then return space( dosenv( arg(1) ) ); return space( value( arg(1), , !env) )
$fact!: procedure; parse arg x _ .; l= length(x); n= l - length( strip(x, 'T', "!") ); if n<=-n | _\=='' | arg()\==1 then return x; z=left(x, l - n); if z<0 | \isInt(z) then return x; return $fact(z, n)
$fact: procedure; parse arg x _ .; arg ,n ! .; n= p(n 1); if \isInt(n) then n= 0; if x<-n | \isInt(x) | n<1 | _ || !\=='' | arg()>2 then return x || copies("!", max(1, n) ); != 1; s= x//n; if s==0 then s=n; do j=s to x by n; !=!*j; end; return !
$sfxa: parse arg ,s,m; arg u,c; if pos( left(s, 2), u)\==0 then do j=length(s) to compare(s, c)-1 by -1; if right(u, j)\==left(c, j) then iterate; _= left(u, length(u) - j); if isNum(_) then return m * _; leave; end; return arg(1)
$sfxf: parse arg y; if right(y, 1)=='!' then y= $fact!(y); if \isNum(y) then y= $sfxz(); if isNum(y) then return y; return $sfxm(y)
$sfxm: parse arg z; arg w; b= 1000; if right(w, 1)=='I' then do; z= shorten(z); w=z; upper w; b=1024; end; p= pos(right(w,1),'KMGTPEZYXWVU'); if p==0 then return arg(1); n=shorten(z); r=num(n,f,1); if isNum(r) then return r*b**p; return arg(1)
$sfxz: return $sfxa( $sfxa( $sfxa( $sfxa( $sfxa( $sfxa(y, 'PAIRs', 2), 'DOZens', 12), 'SCore', 20), 'GREATGRoss', 1728), 'GRoss', 144), 'GOOGOLs', 1e100)
abb: arg abbu; parse arg abb; return abbrev(abbu, _, abbl(abb) )
abbl: return verify( arg(1)'a', @abc, 'M') - 1
abbn: parse arg abbn; return abb(abbn) | abb('NO'abbn)
er: parse arg _1,_2; call '$ERR' "14"p(_1) p(word(_1,2) !fid(1)) _2; if _1<0 then return _1; exit result
err: call er '-'arg(1),arg(2); return ''
erx: call er '-'arg(1),arg(2); exit ''
getdtfid: tfid= p(!var("TMP") !var('TEMP') homedrive()"\"); if substr(tfid, 2, 1)==':' & substr(tfid, 3, 1)\=="\" then tfid= insert('\', t, 2); return strip(tfid, 'T', "\")'\'arg(1)'.'arg(2)
getTFID: if symbol('TFID')=='LIT' then tfid=; if tfid\=='' then return tfid; gfn=word(arg(1) !fn,1); gft=word(arg(2) 'ANS',1); tfid='TEMP';if !tso then tfid=gfn'.'gft;if !cms then tfid=gfn','gft",A4";if !dos then tfid=getdTFID(gfn,gft); return tfid
halt: call er .1
homedrive: if symbol('HOMEDRIVE')\=="VAR" then homedrive= p(!var('HOMEDRIVE') 'C:'); return homedrive
int: int= num(arg(1), arg(2)); if \isInt(int) then call er 92,arg(1) arg(2); return int/1
isInt: return datatype( arg(1), 'W')
isNum: return datatype( arg(1), 'N')
na: if arg(1)\=='' then call er 01,arg(2); parse var ops na ops; if na=='' then call er 35,_o;return na
nai: return int(na(), _o)
nan: return num(na(), _o)
no: if arg(1)\=='' then call er 01,arg(2); return left(_,2)\=='NO'
noValue:  !sigl=sigl; call er 17,!fid(2) !fid(3)  !sigl condition('D') sourceline(!sigl)
num: procedure; parse arg x .,f,q; if x=='' then return x; if isNum(x) then return x/1; x=space(translate(x,,','),0); if \isNum(x) then x=$sfxf(x); if isNum(x) then return x/1; if q==1 then return x;if q=='' then call er 53,x f; call erx 53,x f
p: return word( arg(1), 1)
s: if arg(1)==1 then return arg(3); return word( arg(2) 's', 1)
shorten: procedure; parse arg a,n; return left(a, max(0, length(a) - p(n 1) ) )
syntax:  !sigl= sigl; call er 13,!fid(2)  !fid(3)  !sigl  !cal() condition('D') sourceline(!sigl)