HP 3000 Manuals HP 3000 Manuals
Example of Core Sorting Routine
The following program sorts the personnel files shown below. They are
sorted together by last name. The record size is determined by the input
files. The status parameter is checked after the calls to HPSORTINIT and
HPSORTEND.
The files that are used in this example are as follows (character
positions and data descriptions are indicated for convenience only):
TEMPEMP Information file about temporary employees:
Last Name First Name Employee Number Hire Date
Gangley, Tomas 000003 06/06/87
Rields, Evelyn 000007 07/12/87
Everett, Joyce 000029 10/19/87
0 1 2 3 4 5 6 7
1234567890123456789012345678901234567890123456789012345678901234567890
PERMEMP Information file about permanent employees:
Last Name First Name Employee Number Hire Date
Jones, Eliza 000001 06/06/87
Smith, James 000005 06/06/87
Jackson, Johnathon 000006 06/06/87
Washington, Lois 000014 07/23/87
Jackson, Rosa 000022 08/15/87
0 1 2 3 4 5 6 7
1234567890123456789012345678901234567890123456789012345678901234567890
Example 2-1. SORTFILE Program
program SORTFILE (input,output);
{This program reads the files, TEMPEMP and PERMEMP, }
{sorts by last name, and outputs to the file, ALLEMP}
var
tempFileNum: INTEGER;
permFileNum: INTEGER;
outFileNum : INTEGER;
status : INTEGER;
procedure HPFOPEN ; intrinsic;
procedure HPSORTINIT; intrinsic;
procedure HPSORTERRORMESS; intrinsic;
procedure HPSORTEND; intrinsic;
procedure FCLOSE; intrinsic;
procedure OPEN_FILES;
const
designator = 2;
domain = 3;
access = 11;
record_size = 19;
var
tempFile : packed array [1..10] of CHAR;
permFile : packed array [1..10] of CHAR;
outFile : packed array [1..10] of CHAR;
permanent : INTEGER;
new : INTEGER;
write : INTEGER;
size : INTEGER;
begin
tempFile := '%TEMPEMP%';
permanent := 1;
HPFOPEN (tempFileNum, status, designator, tempFile, domain, permanent) ;
permFile := '%PERMEMP%';
HPFOPEN (permFileNum, status, designator, permFile, domain, permanent) ;
Example 2-1. SORTFILE Program, continued
new := 4;
write := 1;
size := 80;
outFile := '%ALLEMP%';
HPFOPEN (outFileNum, status, designator, outFile, domain, new, access,
write, record_size, size);
end;
procedure DO_SORT;
var
inputfiles : array [1..3] of INTEGER;
outputfile : array [1..2] of INTEGER;
outputOption : INTEGER;
numKeys : INTEGER;
keys : array [1..4] of INTEGER;
altseq : packed array [1..2] of CHAR;
message : packed array [1..80] of CHAR;
length : INTEGER;
statistics : array [1..6] of INTEGER;
begin
inputfiles [1] := tempFileNum;
inputfiles [2] := permFileNum;
inputfiles [3] := 0;
outputfile [1] := outFileNum; {from HPFOPEN}
outputfile [2] := 0;
outputOption := 0; {output record format same as input record format}
numKeys := 1; {one key }
keys[1] := 1; {key begins}
keys[2] := 20; {key length}
keys[3] := 0; {byte data }
keys[4] := 0; {ascending order}
altseq[1] := CHR(255); {data = ASCII; sequence = ASCII}
altseq[2] := CHR(255); {256 characters in ASCII}
HPSORTINIT (status, inputfiles, outputfile, outputOption,,, numKeys, keys,
altseq,,,,,);
if status <> 0 then {If error in HPSORTINIT }
begin {Get message and write it to screen}
Message := ' ';
HPSORTERRORMESS (status, message, length);
writeln (message);
end;
Example 2-1. SORTFILE Program, continued
HPSORTEND (status, );
if status <> 0 then {If error in HPSORTEND }
begin {Get message and write it to screen}
message := ' ';
HPSORTERRORMESS (status, message, length);
writeln (message)
end;
end;
procedure CLOSE_FILES;
var
disposition : SHORTINT;
securityCode : SHORTINT;
begin
disposition := 0;
securityCode := 0;
FCLOSE (tempFileNum, disposition, securityCode);
FCLOSE (permFileNum, disposition, securityCode);
disposition := 1;
FCLOSE (outFileNum, disposition, securityCode);
end;
begin {main}
OPEN_FILES;
DO_SORT;
CLOSE_FILES;
end.
When this program is executed, the output from the sort is written to
ALLEMP. To view the output:
_____________________________________________________________________________
| |
| |
| :print allemp |
| |
| Everett, Joyce 000029 10/19/87 |
| Gangley, Tomas 000003 06/06/87 |
| Jackson, Jonathan 000006 06/06/87 |
| Jackson, Rosa 000022 08/15/87 |
| Jones, Eliza 000001 06/06/87 |
| Rields, Evelyn 000007 07/12/87 |
| Smith, James 000005 06/06/87 |
| Washington, Lois 000014 07/23/87 |
| |
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