From Rosetta Code

The   $ERR.REX   (REXX) program is used to issue various formatted error messages from other REXX programs.

The   $ERR.REX   program makes use of the   $T.REX   program to issue the error messages in red (if available).

The help for the   $ERR   REXX program is included here   ──►   $ERR.HEL. <lang rexx>/*REXX program to display error or informational messages (in color, if supported). */

trace off /*turn off all REXX cmd error messages.*/

parse arg ! /*obtain the original arguments. */

if !all( arg() ) then exit /*Request for help? Display, then exit*/ if !cms then address /*handle ADDRESS for CMS. */

signal on halt /*be able to handle the halting of pgm.*/ signal on noValue /* " " " " undefined variables*/ signal on syntax /* " " " " pgm syntax errors.*/

numeric digits 100 /*what the hell, support big numbers. */

                                                /*══════ a list of external commands.  */

@ctty = 'CTTY' /*point to the CTTY command. */ @globalv = 'GLOBALV' /* " " " GLOBALV " */ @finis = 'FINIS' /* " " " FINIS " */ @subcom = 'SUBCOM' /* " " " CMS SUBCOM " */ @cpset = 'CP SET' /* " " " CP SET " */ @conwait = 'CONWAIT' /* " " " CONWAIT " */ @cpspool = 'CP SPOOL' /* " " " CP SPOOL " */ @cmstype = 'SET CMSTYPE' /* " " " SET CMSTYPE " */

if !cms | !dos then @ = '────────' /*use hyphens for dashes in messages. */

               else @ = '--------'              /* "   minuses  "     "    "     "     */

parse var !! !! ' ..F=' ftops /*is $ERR to write errors to file? */ if ftops\== then ftops= '.F='ftops /*Yes, then add to FTOPS variable. */ etops= strip(ftops '.C=red .END=1') /*also, add it to the ETOPS variable.*/ g.1= space(!!) /*a version with no extra blanks. */ pblank= '05'x /*use pseudoBlank as the "true" blank*/

 do j=2  to 9                                   /*process some possible shortcuts.     */
 k= j - 1                                       /*point to the previous variable.      */
 parse var  g.k    a.k  g.j                     /*get the  "G"  version (equals "all").*/
 if a.k==','  then a.k=                         /*if omitted, then use a null.         */
 g.k= translate(g.k, , pblank)                  /*translate to a true blank.           */
 a.k= translate(a.k, , pblank)                  /*    "      " "   "    "              */
 aU.k= a.k
 upper aU.k                                     /*get an uppercase version of   a.k    */
 L.k= length(a.k)                               /*get the length of the  a.k  variable.*/
 c.k=  comma(a.k)                               /*add a comma (,)  to the number.      */
 w.k= length(c.k)                               /*get the length of commatized number. */
 end   /*j*/
                                                /* [↓]  shortcut versions of   a.      */

a2= a.2; a3= a.3; a4= a.4; a5= a.5; a6= a.6; a7= a.7; a8= a.8

           g3= g.3;    g4= g.4;    g5= g.5;    g6= g.6;    g7= g.7;    g8= g.8

aa5= a.5 if isNum(aa5) then aa5= abs(aa5) /*if it's a number, then use ABS value.*/ i= a.1 /*this is the error number. */ errmsgto= errmsgnt= xedit= 0 /*indicate no XEDIT (so far). */

if !cms then do /*if CMS, then do some housework first.*/

             @globalv 'SELECT'  !fn  "GET ERRMSGTO ERRMSGNT"
             @finis '* * *'                     /*close all open files.                */
             @cmstype 'RT'                      /*ensure the user sees the error msgs. */
             @conwait                           /*wait for all messages to be written. */
             @cpspool 'CON TERM'                /*ensure user sees the error messages. */
             @cpset' IMSG ON'                   /*   "     "    "  informational msgs. */
             @cpset' EMSG ON'                   /*   "     "    "      error       "   */
             @subcom 'XEDIT'                    /*see if executing under  XEDIT.       */
             xedit= \rc  &  \cmsflag('SUBSET')  /*set flag: running under XEDIT |SUBSET*/
             ufid= a3 a4 a5                     /*maybe obtain a fileID for a message. */

if !dos then do /*if DOS, then perform some housework.*/

             if \!nt  then @ctty 'con'          /*Not Windows NT?  Then use  CTTY  cmd.*/
             _= a4
             if _\==  &  right(_,1)\=="\"  then _= _'\'
             ufid= _  ||  a2'.'a3

i= space( translate(i, , '-'), 0) /*remove all minus signs from string. */ if i== then call erb 57 /*Is it null? Than an oops-say message*/

if i=0 then do /*if "error" is zero, show the author. */

            _=                                  /*now,  start with a clean slate.      */
            iL= length(i)                       /*use number of zeroes for more info.  */
            if iL>1  then _= @'author'@"÷÷÷÷Gerard J. Schildberger"
            if iL>2  then _= _           '÷÷phone   (701)-242-8238'
            if iL>3  then _= _           '÷÷E-mail gerardS@rrt.net'
            if iL>5  then _= _           '÷÷9411  West Ridge Road,'
            if iL>5  then _= _           '÷÷Hankinson, ND    58041'
            atops= strip(ftops '.A=-2 .X=-2 .E=2 .C=yell .J=c .BOX= .KD=÷')
            if _\==  then call $t atops _     /*tell if more info  if  than one zero.*/
            exit 0                              /*exit with a  return code  of zero.   */

if i==14000 |, /*is this a message for a HALT ? */

  i==14.1    then do                            /*  ··· or in some cases,  14.1 error. */
                  htops= strip(ftops '.X=-1 .C=red .J=c .BOX=')
                  call $t htops 'The REXX program' @ a2 @ "has been halted !"
                  exit 14000                    /*  ··· and indicate a  HALT  condition*/

if \isInt(i) then call erb 53,i "error_code" /*Hmmm, we got an "internal" pgm error.*/ oi= i /*keep the original error number around*/ xedit= (xedit & i>0) /*inside the XEDIT program? */ i= abs(i) /*use the absolute value of I. */ if i<1400 | i>1499 then call erb 99,oi /*check for a legal range of I. */ k= i - 1400 /*from now on, use a shorter I. */ if xedit then address 'XEDIT' "SET MSGM ON LONG" /*allow XEDIT messages to be seen. */ call sy /*display a blank line for the eyeballs*/ call sy '($$$'i") *error*:" /*write a header line (before the msg).*/

                                                /*now, display the error message(s).   */

if k== 0 then call sy "some commands can't or shouldn't be executed while in" g3

if k== 1 then call sy "the" g3 'was previously specified or specified more than once'

if k== 2 then call sy "the" a4 "argument can't be" choose("negative", g5)":" a3

if k== 3 then call sy 'the (disk) filemode' a3 "can't have any read-only extensions" g4

if k== 4 then call sy 'the' a4 "filemode/address can't be" choose('RELEASEd',g5)":" a3

if k== 5 then do

              call sy "illegal comparator operator" @ a3 'specified,'
              call sy "it must be one of:    =  \=  <  <=  >  >=  \<  \>"

if k== 6 then call sy "no special characters are allowed in the" g4':' a3

if k== 7 then call sy "fixed-point underflow or overflow (result is too small or too large)"

if k== 8 then call sy "illegal filemode" @ a3 @ g4

if k== 9 then call sy "a terminal screen (CRT) is required with the" @ a3 @ 'feature'

if k==10 then if a3== then call sy "missing fileid for" g4

                         else call sy "illegal fileid"  @  space(a3 a4 a5)  @  g6

if k==11 then call sy "comparand operand must be an = or \= when using *xxx* type comparisons"

if k==12 then call sy "not enough" choose('virtual storage', g4)", at least" a3 'are needed'

if k==13 then do

              call sy "REXX syntax error"
              if isInt(a.6)  then call sy errortext(a.6)
              call syline

if k==14 then call sy 'the' a5 "argument" a3 "can't be" choose('greater',a.7) "than" a6 a4

if k==15 then do

              if a3==  then call sy "division by zero"
                         else do
                              call sy 'raising a negative number' @ a3 @
                              call sy "to a negative or an odd fractional power" @ a4 @
                              call fto g5

if k==16 then do

              call sy "illegal MDISK" g4 'address:' a3","
              call sy 'it must be exactly three hexadecimal characters  (but not 000),  or it may be'
              call sy "preceded by an asterisk (*)  followed by three decimal characters"

if k==17 then do

              call sy "undefined REXX variable referenced" a.6
              call syline

if k==18 then do

              call sy "illegal MDISK address or filemode,"
              call sy "the 191 A MDISK address is reserved for the CMS user's private MDISK"

if k==19 then call sy 'numeric digits ('comma(a6)") isn't sufficient to" a4 a5 'to' a3

if k==20 then call sy "the" a3 @ a4 'and' g5 @ "aren't alike"

if k==21 then call sy choose("increment",a3) 'must be preceded by a plus (+) or a minus (-)'

if k==22 then do

              _= 'combination of characters:'
              if L.4==1  then _="character:"
              call sy a3 'contains an invalid' _ g4

if k==23 then call sy "the" a3 choose("option",a5) "requires the" a4 choose('option or feature',g6)

if k==24 then call sy "illegal" choose('volume',a4) "serial:" a3 ' (it must be six or less characters)'

if k==25 then do

              call sy "you must be in the"  a3  'mode/program to use the'
              call sy "specified command (or it's" g4 "option)"

if k==26 then do

              call sy "illegal MDISK" g4  'address:' a3","
              call sy 'it must be exactly three hexadecimal characters  (but not 000)'

if k==27 then call sy choose('number',g4) "can't be negative or zero (must be positive):" a3

if k==28 then call sy "duplicate" a3 'defined or specified:' g4

if k==29 then call sy "illegal filemode:" a3', it must be one character'

if k==30 then do

              call say30
              if a5==a6 | a6== | a6==","  then call sy "it must be" space(aa5 g8 _b)
                                            else do
                                                 _to= 'to'
                                                 if a6==aa5+1  then _to= "or"
                                                 call sy 'it must be from' aa5 _to a6 _b

if k==31 then call sy "no lines (or incorrect lines) were put in the program stack" g3

if k==32 then call sy 'the command' a3 "exited, but it isn't supposed to exit or stop"

if k==33 then call sy 'the' a3 "MDISK isn't a CMS MDISK, it's in the wrong format"

if k==34 then call sy @ a3 a4 @ "can't be executed from the" a5 'MDISK'

if k==35 then do

              call sy "no" choose('argument', a4)  'was specified after or'
              call fto a3 g5

if k==36 then call sy 'file' @ g3 @ "can't exist on the" a5 'MDISK'

if k==37 then do

              y= a3
              _= pos(a3,"`{[(«')
              if _\==0  then y=translate(word('single_quote double_quote grave_accent left_brace left_bracket left_parenthesis left_double_carrot',_),,"_") a3
              call sy 'unmatched'  y  g4

if k==38 then call sy 'file' @ space(a3 a4 a5) @ choose("can't be located or is empty",g6)

if k==39 then call sy "the" a3 choose('argument',a8) 'must be' a4 a5 "the" a6 choose('argument',a7)

if k==40 then do

              call sy 'argument' @ a3 @ "isn't a valid hexadecimal string/number"
              call sy "(it contains a character other than 0123456789ABCDEFabcdef or a blank)"
              call fto g4

if k==41 then do

              call sy "VM userid" @ g3 @ "doesn't exist or"
              call sy 'is illegal  (it may have an illegal character in it)'

if k==42 then call sy "the MDISK" a4 'for the user' a3 "doesn't exist"

if k==43 then call sy "illegal password for the" a3 a5 'MDISK was specified'

if k==44 then do

              call sy "a CMS command is being used out of context,  or"
              call sy 'a command was renamed,  or the FSTs have been altered'
              _= 'DOS'
              if !cms  then _="CMS"
              call sy '(you may have to IPL' _")"

if k==45 then call sy 'VM userid' @ g3 @ "isn't logged on"

if k==46 then call sy "the file's" @ g4 "LRECL can't exceed" a3

if k==47 then call sy a3 @ a4 @ "not found" g5

if k==48 then do

              L= 1
              if L.4==1  |  right(aU.4,1)=='X'  then _= " an"
              if _==  then L= 0
              call sy @ a3 g5 @ 'contains'_ "invalid character"s(L)':'  a4

if k==49 then call sy "CP LINK error for MDISK" a4 'userid' a3

if k==50 then do

              call sy 'illegal/invalid'  a3  "specified"  @  a4  @
              call fto g5

if k==51 then call sy choose("documentation", a5) 'for' a3 a4 "couldn't be located"

if k==52 then do

              call sy "arguments aren't permitted"
              call fto a4

if k==53 then do

              call sy 'argument' @  a3  @ "isn't numeric"  g5
              call fto a4

if k==54 then do

              call sy "not enough" choose('arguments',a3) "were specified"  g5
              call fto a4

if k==55 then do

              call sy "illegal argument" @  a3  @  g5
              call fto a4

if k==56 then call sy "illegal number of" choose('arguments',a4) "were specified" g5 a3

if k==57 then do

              y= choose("arguments", a3)
              z= 'was'
              if translate(right(y,1))=="S"  then z= 'were'
              call sy "no" y z "specified"

if k==58 then call sy "only" g3 'argument's(a3) 'are accepted'

if k==59 then do

              call sy "too many" choose('arguments',a3) "were specified"  g5
              call fto a4

if k==60 then call sy "argument#" a4 @ a3 @ 'must be an * or numeric'

if k==61 then call sy "conflicting arguments:" g3

if k==62 then call sy choose('fileid1',a3) "and" choose('fileid2',a4) "can't be identical" g5

if k==63 then do

              call sy "no" 'argument was specified after or'
              call fto g3

if k==64 then call sy "up to" g3 'argument's(a3) 'are accepted'

if k==65 then call sy "bad argument" @ a3 @ "illegal use of" g4

if k==66 then call sy "only" a3 'to' a4 "arguments are accepted"

if k==67 then call sy "unable to parse" a3 'from the results of:' g4

if k==68 then do

              call sy "return code" a3 'doing:'
              call sy g4
              i= a3

if k==69 then call sy 'user' @ a3 @ "can't be logged on while the command" @ a2 @ 'is running'

if k==70 then do

              if a3==2  then call sy "the" @ a2 @ 'command must be executed under the' a4 "userid"
              if a3==1  then call sy "the" @ a2 @ "command must be executed from the A MDISK"
              call sy "illegal use of the" @ a2 @ "command, subrc="a3

if k==71 then call sy "can't attach a" g3

if k==72 then do

              call sy 'argument'  @  a3  @ "isn't alphabetic"  g5
              call fto a4

if k==73 then do

              call sy "an attempt was made to execute an unauthorized or restricted command"
              if g3\==  then call sy g3

if k==74 then call sy "the user" @ a3 @ 'must be in' a4 "mode"

if k==75 then call sy "no" choose('write',a4) "access to the" @ choose('A',space(left(a3),1)) @ "MDISK"

if k==76 then call sy a3 g5 "isn't known or supported:" a4

if k==77 then call sy space('error' a3 "in writing to disk file" @ g4 @)

if k==78 then call sy choose("file", g6) @ a3 a4 a5 @ 'not found'

if k==79 then call sy "the time window for execution is" a3 'through' a4

if k==80 then call sy @ a3 @ "isn't a known userid"

if k==81 then do

              call sy 'argument' @ a5 space(@ g7) "is out of range"
              _= max(w.3, w.4)
              if L.3\==0  then call sy 'the lower limit is:'  right(c.3, _)
              if L.4\==0  then call sy 'the upper limit is:'  right(c.4, _)
              call fto a6

if k==82 then call sy g4 @ a3 @ "can't be located"

if k==83 then call sy "the" @ g3 @ 'option is required'

if k==84 then call sy "file" @ g4 @ 'had a syntax error for' a3

if k==85 then call sy "illegal combination of arguments:" g4

if k==86 then do

              call sy "the" choose(a3,a2) 'command is being invoked out of context'
              if g4\==  then call sy g4

if k==87 then do

              call sy 'argument' @ a3 @ "isn't a valid" choose('bit digit',a4)
              call sy '(it contains more than one binary digit)'
              call fto g5

if k==88 then call sy g4 @ a3 @ "doesn't exist"

if k==89 then call sy 'the' a3 "command can't be found"

if k==90 then do

              call sy 'evaluation of' a3 "contains a zero divisor and"
              call sy 'the result is infinite' g4

if k==91 then do

              call sy 'argument' @ a3 @ "isn't a valid" choose('bit string',a4)
              call sy '(it contains a non-binary character other than 0 or 1)'
              call fto g5

if k==92 then do

              call sy choose('argument',a4) @ a3 @ "isn't a whole number (integer)" g7
              call fto a5

if k==93 then call sy "file" @ g3 @ 'already exists'

if k==94 then call sy "the T-DISK requested can't be obtained"

if k==95 then call sy "not enough free storage can be obtained"

if k==96 then call sy "illegal file" @ g3 @ 'or it was incorrectly modified'

if k==97 then do

              call sy "a command failed,"
              if a3\==  then call sy "sub-command" @ g3 @','
              call sy "it's all or partially restricted to authorized users"

if k==98 then do

              call sy "an attempt was made to execute the" @ a2 @ 'command while'
              call sy "the user" @ userid() @ "was in disconnected mode"

if k==99 then call sy "illegal error number for the" !fn 'REXX EXEC' ":" g3

if a2\== then call sy "for the" @ a2 @ 'command or function.' call sy if errmsgnt\== & errmsgto\=="" then call sy 'A notification (via $M) of this error has been sent to' errmsgto if !cms then @globalv 'SELECT' !fn "PURGE" if \isInt(i) then call er 53, i exit sign(oi)*i

/*─────────────────────────────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)) $t: !call=']$T'; call "$T" arg(1); call=; return choose: parse arg c1,c2; if c2== | c2=="," then return c1; return c2 comma: procedure; parse arg _,c,p,t; c=pickBlank(c,","); o=p(p 3); p=abs(o); t=p(t 999999999); if \isInt(p) | \isInt(t) | p==0 | arg()>4 then return _; n=_'.9'; #=123456789; k=0; return comma_() comma_: if o<0 then do; b=verify(_,' '); if b==0 then return _; e=length(_)-verify(reverse(_),' ')+1; end; else do; b=verify(n,#,"M"); e=verify(n,#'0',,verify(n,#"0.",'M'))-p-1; end; do j=e to b by -p while k<t; _=insert(c,_,j); k=k+1;end;return _ er: parse arg _1,_2; call '$ERR' "14"p(_1) p(word(_1,2) !fid(1)) _2; if _1<0 then return _1; exit result erb: call sy; if a2\=="" then call sy '('!fn "was invoked by the" @ a2 @ 'EXEC)'; call er arg(1),arg(2) fto: parse arg fto ftox; ftoo='option'; if right(fto,2)=='()' then ftoo='function'; if fto\== then call sy "for the" ftoo @ space(fto ftox) @; return halt: call er .1 isInt: return datatype(arg(1),'W') isNum: return datatype(arg(1),'N') noValue: !sigl=sigl; call er 17,!fid(2) !fid(3) !sigl condition('D') sourceline(!sigl) opf: if right(arg(1),2)=='()' then return "function"; return 'option' p: return word(arg(1),1) pickBlank: procedure; parse arg x,y; arg xu; if xu=='BLANK' then return ' '; return p(x y) s: if arg(1)==1 then return arg(3); return p(arg(2) 's') say30: if a5==-1 then call sy 'illegal' a4":" a3; else call sy "illegal length of" a4":" a3; _t=p(a7 'character'); _b=_t || s(p(a6 aa5))" in length"; return sy: sy=arg(1); if length(sy)<81 then do; call syit sy; return; end; sysy=; do forever while sy\==; parse var sy _t sy; if length(sysy _t)<80 then do;sysy=sysy _t;iterate;end; call syitb;sysy=_t;end; if strip(sysy)\== then call syitb;return syfunc: if left(a6,1)==']' then do; _sl=g8; call sy "invocation of an undefined REXX function/subroutine" substr(a6,2); end; return syit: syit=arg(1); if xedit then address 'XEDIT' "EMSG" syit; else if a2=='$T' then say syit; else call $t etops syit; if errmsgto\== & syit\== then call '$M' errmsgto syit; return syitb: if left(sysy,1)==' ' then sysy=substr(sysy,2); call syit sysy; return syline: if a5\==0 then call sy 'on line' a5 "of" ufid; _sl=g7; call syfunc; if _sl\== then do; call sy; call sy "REXX sourceline is:"; call sy; call sy _sl; call sy; end; if !cms then do;'EXECSTAT' a2 a3;if rc==0 then "EXECDROP" a2 a3;end;return syntax: !sigl=sigl; call er 13,!fid(2) !fid(3) !sigl !cal() condition('D') sourceline(!sigl)</lang>