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IMPLEMENTATION MODULE ShellVars;
FROM ASCII IMPORT nul;
FROM SYSTEM IMPORT ADDRESS,TSIZE;
FROM CPROC IMPORT margc,margv,menvp;
%{
extern int m2argc;
extern char **m2argv,**m2envp;
#define margc(v) v=m2argc
#define margv(v) *(char ***)&(v)=m2argv
#define menvp(v) *(char ***)&(v)=m2envp
%}
TYPE PtrToArgs=POINTER TO POINTER TO CHAR;
PROCEDURE GetNArg():CARDINAL;
VAR
argc:CARDINAL;argv,envp:PtrToArgs;
BEGIN
margc(argc);
margv(argv);
menvp(envp);
RETURN argc;
END GetNArg;
PROCEDURE GetNthArgStr(n:CARDINAL;VAR str: ARRAY OF CHAR);
VAR
argc:CARDINAL;argv,envp:PtrToArgs;
BEGIN
str[0]:=nul;
margc(argc);
margv(argv);
menvp(envp);
IF n>=argc THEN RETURN END;
argv:=PtrToArgs(CARDINAL(argv)+n*TSIZE(ADDRESS));
GetStr(argv,str);
END GetNthArgStr;
PROCEDURE GetNthEnvStr(n:CARDINAL;VAR str: ARRAY OF CHAR);
VAR
argc:CARDINAL;argv,envp:PtrToArgs;i:CARDINAL;
BEGIN
str[0]:=nul;
margc(argc);
margv(argv);
menvp(envp);
i:=0;
LOOP
IF envp^=NIL THEN RETURN END;
IF i=n THEN EXIT END;
envp:=PtrToArgs(CARDINAL(envp)+TSIZE(ADDRESS));
INC(i);
END;
GetStr(envp,str);
END GetNthEnvStr;
(*----- internal procedure:---------*)
PROCEDURE GetStr(p:PtrToArgs;VAR str:ARRAY OF CHAR);
TYPE PtrToChar=POINTER TO CHAR;
VAR
i:CARDINAL; pch: PtrToChar;
BEGIN
pch:=PtrToChar(p^); i:=0;
WHILE (i<=CARDINAL(HIGH(str))) & (pch^#nul) DO
str[i]:=pch^; pch:=PtrToChar(CARDINAL(pch)+1); INC(i);
END;
IF i<=CARDINAL(HIGH(str)) THEN str[i]:=nul END;
END GetStr;
BEGIN
END ShellVars.
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