1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
implement Tst;
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Point, Rect: import draw;
include "bufio.m";
bufio: Bufio;
Iobuf: import bufio;
Tst: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
File: adt {
name: string;
fd: ref Sys->FD;
pid: int;
};
files: list of ref File;
stderr: ref Sys->FD;
outputch: chan of chan of string;
init(ctxt: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
bufio = load Bufio Bufio->PATH;
sys->print(":cardtst\n");
stdin := bufio->fopen(sys->fildes(0), Sys->OREAD);
line := "";
currfd: ref Sys->FD;
outputch = chan of chan of string;
spawn outputproc();
while ((s := stdin.gets('\n')) != nil) {
if (len s > 1 && s[len s - 2] == '\\')
line += s[0:len s - 2] + "\n";
else {
s = line + s;
line = nil;
if (s[0] == ':') {
(nil, toks) := sys->tokenize(s, " \n");
case hd toks {
":open" =>
if (tl toks == nil) {
sys->fprint(stderr, "usage: open file\n");
continue;
}
f := open(hd tl toks);
if (f != nil) {
currfd = f.fd;
sys->print("current file is now %s\n", f.name);
}
":close" =>
if (tl toks == nil) {
sys->fprint(stderr, "usage: close file\n");
continue;
}
fl := files;
f: ref File;
for (files = nil; fl != nil; fl = tl fl) {
if ((hd fl).name == hd tl toks)
f = hd fl;
else
files = hd fl :: files;
}
if (f == nil) {
sys->fprint(stderr, "unknown file '%s'\n", hd tl toks);
continue;
}
sys->fprint(f.fd, "");
f = nil;
":files" =>
for (fl := files; fl != nil; fl = tl fl) {
if ((hd fl).fd == currfd)
sys->print(":%s <--- current\n", (hd fl).name);
else
sys->print(":%s\n", (hd fl).name);
}
* =>
for (fl := files; fl != nil; fl = tl fl)
if ((hd fl).name == (hd toks)[1:])
break;
if (fl == nil) {
sys->fprint(stderr, "unknown file '%s'\n", (hd toks)[1:]);
continue;
}
currfd = (hd fl).fd;
}
} else if (currfd == nil)
sys->fprint(stderr, "no current file\n");
else if (len s > 1 && sys->fprint(currfd, "%s", s[0:len s - 1]) == -1)
sys->fprint(stderr, "command failed: %r\n");
}
}
for (fl := files; fl != nil; fl = tl fl)
kill((hd fl).pid);
outputch <-= nil;
}
open(f: string): ref File
{
fd := sys->open("/n/remote/" + f, Sys->ORDWR);
if (fd == nil) {
sys->fprint(stderr, "cannot open %s: %r\n", f);
return nil;
}
sync := chan of int;
spawn updateproc(f, fd, sync);
files = ref File(f, fd, <-sync) :: files;
sys->print("opened %s\n", f);
return hd files;
}
updateproc(name: string, fd: ref Sys->FD, sync: chan of int)
{
sync <-= sys->pctl(0, nil);
c := chan of string;
buf := array[Sys->ATOMICIO] of byte;
while ((n := sys->read(fd, buf, len buf)) > 0) {
(nt, toks) := sys->tokenize(string buf[0:n], "\n");
outputch <-= c;
c <-= "++ " + name + ":\n";
for (; toks != nil; toks = tl toks)
c <-= sys->sprint("+%s\n", hd toks);
c <-= nil;
}
if (n < 0)
sys->fprint(stderr, "cards: error reading %s: %r\n", name);
sys->fprint(stderr, "cards: updateproc (%s) exiting\n", name);
}
outputproc()
{
for (;;) {
c := <-outputch;
if (c == nil)
exit;
while ((s := <-c) != nil)
sys->print("%s", s);
}
}
kill(pid: int)
{
if ((fd := sys->open("/prog/"+string pid+"/ctl", Sys->OWRITE)) != nil)
sys->write(fd, array of byte "kill", 4);
}
|
