ref: 54bac038f411c10a596adf84c06df32f8c7c4c53
dir: /appl/lib/tcl_io.b/
implement TclLib;
include "sys.m";
sys: Sys;
include "draw.m";
include "bufio.m";
bufmod : Bufio;
Iobuf : import bufmod;
include "string.m";
str : String;
include "tk.m";
include "tcl.m";
include "tcllib.m";
error : int;
started : int;
tclmod : ref Tcl_Core->TclData;
name2fid : array of (ref Iobuf,string,int);
valid_commands := array[] of {
"close",
"eof" ,
"file",
"flush",
"gets" ,
"open",
"puts",
"read" ,
"seek" ,
"tell"
};
init() : string {
started=1;
str = load String String->PATH;
sys = load Sys Sys->PATH;
bufmod = load Bufio Bufio->PATH;
if (str==nil || bufmod==nil)
return "Can't initialise IO package.";
name2fid = array[100] of (ref Iobuf,string,int);
stdout := bufmod->fopen(sys->fildes(1),bufmod->OWRITE);
if (stdout==nil)
return "cannot open stdout for writing.\n";
name2fid[0]=(nil,"stdin",0);
name2fid[1]=(stdout,"stdout",0);
return nil;
}
about() : array of string{
return valid_commands;
}
exec(tcl : ref Tcl_Core->TclData,argv : array of string) : (int,string) {
tclmod=tcl;
msg :string;
if (!started) init();
error=0;
case argv[0] {
"close" =>
msg = do_close(argv);
return (error,msg);
"eof" =>
msg = do_eof(argv);
return (error,msg);
"file" =>
msg = do_nothing(argv);
return (error,msg);
"flush" =>
msg = do_nothing(argv);
return (error,msg);
"gets" =>
msg = do_gets(argv);
return (error,msg);
"open" =>
msg = do_open(argv);
return (error,msg);
"puts" =>
msg = do_puts(argv);
return (error,msg);
"read" =>
msg = do_read(argv);
return (error,msg);
"seek" =>
msg = do_seek(argv);
return (error,msg);
"tell" =>
msg = do_nothing(argv);
return (error,msg);
}
return (1,nil);
}
do_nothing(argv : array of string) : string {
if (len argv==0);
return nil;
}
do_close(argv : array of string) : string {
iob : ref Iobuf;
name : string;
j : int;
iob=nil;
if (len argv!=2)
return notify(1,"close fileId");
for(i:=0;i<len name2fid;i++){
(iob,name,j)=name2fid[i];
if (name==argv[1])
break;
}
if (iob==nil)
return notify(0,sys->sprint("bad file identifier \"%s\"",
argv[1]));
iob.flush();
iob.close();
iob=nil;
name2fid[i]=(nil,"",0);
return nil;
}
do_eof(argv : array of string) : string {
name : string;
j : int;
iob : ref Iobuf;
if (len argv!=2)
return notify(1,"eof fileId");
for(i:=0;i<len name2fid;i++){
(iob,name,j)=name2fid[i];
if (name==argv[1])
return string j;
}
return notify(0,sys->sprint("bad file identifier \"%s\"",argv[1]));
}
do_gets(argv : array of string) : string {
iob : ref Iobuf;
line : string;
if (len argv==1 || len argv > 3)
return notify(1,"gets fileId ?varName?");
if (argv[1]=="stdin")
line = <- tclmod.lines;
else{
iob=lookup_iob(argv[1]);
if (iob==nil)
return notify(0,sys->sprint(
"bad file identifier \"%s\"",argv[1]));
line=iob.gets('\n');
}
if (line==nil){
set_eof(iob);
return nil;
}
return line[0:len line -1];
}
do_seek(argv : array of string) : string {
iob : ref Iobuf;
if (len argv < 3 || len argv > 4)
return notify(1,"seek fileId offset ?origin?");
iob=lookup_iob(argv[1]);
if (iob==nil)
return notify(0,sys->sprint(
"bad file identifier \"%s\"",argv[1]));
flag := Sys->SEEKSTART;
if (len argv == 4) {
case argv[3] {
"SEEKSTART" =>
flag = Sys->SEEKSTART;
"SEEKRELA" =>
flag = Sys->SEEKRELA;
"SEEKEND" =>
flag = Sys->SEEKEND;
* =>
return notify(0,sys->sprint(
"illegal access mode \"%s\"",
argv[3]));
}
}
iob.seek(big argv[2],flag);
return nil;
}
do_open(argv : array of string) : string {
flag : int;
if (len argv==1 || len argv > 3)
return notify(1,
"open filename ?access? ?permissions?");
name:=argv[1];
if (len argv == 2)
flag = bufmod->OREAD;
else {
case argv[2] {
"OREAD" =>
flag = bufmod->OREAD;
"OWRITE" =>
flag = bufmod->OWRITE;
"ORDWR" =>
flag = bufmod->ORDWR;
* =>
return notify(0,sys->sprint(
"illegal access mode \"%s\"",
argv[2]));
}
}
iob := bufmod->open(name,flag);
if (iob==nil)
return notify(0,
sys->sprint("couldn't open \"%s\": No" +
" such file or directory.",name));
for (i:=0;i<len name2fid;i++){
(iob2,name2,j):=name2fid[i];
if (iob2==nil){
name2fid[i]=(iob,"file"+string i,0);
return "file"+string i;
}
}
return notify(0,"File table full!");
}
do_puts(argv : array of string) : string {
iob : ref Iobuf;
if (len argv==1 || len argv >4)
return notify(1,
"puts ?-nonewline? ?fileId? string");
if (argv[1]=="-nonewline"){
if (len argv==2)
return notify(1,
"puts ?-nonewline? ?fileId? string");
if (len argv==3)
sys->print("%s",argv[2]);
else{
iob=lookup_iob(argv[2]);
if (iob==nil)
return notify(0,sys->sprint(
"bad file identifier \"%s\"",
argv[2]));
iob.puts(argv[3]);
iob.flush();
}
} else {
if (len argv==2)
sys->print("%s\n",argv[1]);
if (len argv==3){
iob=lookup_iob(argv[1]);
if (iob==nil)
return notify(0,sys->sprint(
"bad file identifier \"%s\"",
argv[1]));
iob.puts(argv[2]+"\n");
iob.flush();
}
if (len argv==4)
return notify(0,sys->sprint(
"bad argument \"%s\": should be"+
" \"nonewline\"",argv[3]));
}
return nil;
}
do_read(argv : array of string) : string {
iob : ref Iobuf;
line :string;
if (len argv<2 || len argv>3)
return notify(1,
"read fileId ?numBytes?\" or \"read ?-nonewline? fileId");
if (argv[1]!="-nonewline"){
iob=lookup_iob(argv[1]);
if (iob==nil)
return notify(0,sys->sprint(
"bad file identifier \"%s\"", argv[1]));
if (len argv == 3){
buf := array[int argv[2]] of byte;
n:=iob.read(buf,len buf);
if (n==0){
set_eof(iob);
return nil;
}
return string buf[0:n];
}
line=iob.gets('\n');
if (line==nil)
set_eof(iob);
else
line[len line]='\n';
return line;
}else{
iob=lookup_iob(argv[2]);
if (iob==nil)
return notify(0,sys->sprint(
"bad file identifier \"%s\"", argv[2]));
line=iob.gets('\n');
if (line==nil)
set_eof(iob);
return line;
}
}
notify(num : int,s : string) : string {
error=1;
case num{
1 =>
return sys->sprint(
"wrong # args: should be \"%s\"",s);
* =>
return s;
}
}
lookup_iob(s:string) : ref Iobuf{
iob : ref Iobuf;
name : string;
j : int;
for(i:=0;i<len name2fid;i++){
(iob,name,j)=name2fid[i];
if (name==s)
break;
}
if (i==len name2fid)
return nil;
return iob;
}
set_eof(iob : ref Iobuf) {
iob2 : ref Iobuf;
name : string;
j : int;
for(i:=0;i<len name2fid;i++){
(iob2,name,j)=name2fid[i];
if (iob==iob2)
break;
}
if (i!=len name2fid)
name2fid[i]=(iob,name,1);
return;
}