90 lines
1.8 KiB
Modula-2
90 lines
1.8 KiB
Modula-2
(*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*)
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(*$R-*)
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IMPLEMENTATION MODULE Traps;
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(*
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Module: Facility for handling traps
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Author: Ceriel J.H. Jacobs
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Version: $Header$
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*)
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IMPORT EM;
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IMPORT Unix;
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FROM SYSTEM IMPORT ADDRESS, ADR;
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FROM Arguments IMPORT Argv;
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PROCEDURE InstallTrapHandler(t: TrapHandler): TrapHandler;
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(* Install a new trap handler, and return the previous one.
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Parameter of trap handler is the trap number.
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*)
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BEGIN
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RETURN EM.SIG(t);
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END InstallTrapHandler;
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PROCEDURE Message(str: ARRAY OF CHAR);
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(* Write message "str" on standard error, preceeded by filename and
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linenumber if possible
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*)
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VAR p, q: POINTER TO CHAR;
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l: CARDINAL;
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lino: INTEGER;
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buf, buf2: ARRAY [0..255] OF CHAR;
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i, j: CARDINAL;
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BEGIN
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p := EM.FILN();
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IF p # NIL THEN
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q := p;
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WHILE p^ # 0C DO
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p := ADDRESS(p) + 1;
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END;
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IF Unix.write(2, q, ADDRESS(p) - ADDRESS(q)) < 0 THEN END;
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ELSE
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l := Argv(0, buf);
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IF Unix.write(2, ADR(buf), l) < 0 THEN END;
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END;
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lino := EM.LINO();
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i := 0;
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IF lino # 0 THEN
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i := 2;
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buf[0] := ',';
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buf[1] := ' ';
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IF lino < 0 THEN
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buf[2] := '-';
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i := 3;
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lino := - lino;
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END;
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j := 0;
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REPEAT
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buf2[j] := CHR(CARDINAL(lino) MOD 10 + ORD('0'));
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lino := lino DIV 10;
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INC(j);
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UNTIL lino = 0;
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WHILE j > 0 DO
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DEC(j);
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buf[i] := buf2[j];
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INC(i);
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END;
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END;
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buf[i] := ':';
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buf[i+1] := ' ';
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IF Unix.write(2, ADR(buf), i+2) < 0 THEN END;
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i := 0;
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WHILE (i <= HIGH(str)) AND (str[i] # 0C) DO
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INC(i);
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END;
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IF Unix.write(2, ADR(str), i) < 0 THEN END;
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buf[0] := 12C;
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IF Unix.write(2, ADR(buf), 1) < 0 THEN END;
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END Message;
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PROCEDURE Trap(n: INTEGER);
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(* cause trap number "n" to occur *)
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BEGIN
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EM.TRP(n);
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END Trap;
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END Traps.
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