20060303a

1 files changed, 132 insertions, 0 deletions

diff --git a/appl/cmd/uudecode.b b/appl/cmd/uudecode.b
new file mode 100644
index 00000000..12894aa3
--- /dev/null
+++ b/appl/cmd/uudecode.b
@@ -0,0 +1,132 @@
+implement Uudecode;
+
+include "sys.m";
+	sys : Sys;
+include "draw.m";
+include "string.m";
+	str : String;
+include "bufio.m";
+	bufio : Bufio;
+	Iobuf : import bufio;
+
+Uudecode : module
+{
+	init : fn(nil : ref Draw->Context, argv : list of string);
+};
+
+fatal(s : string)
+{
+	sys->fprint(sys->fildes(2), "%s\n", s);
+	exit;
+}
+
+usage()
+{
+	fatal("usage: uudecode [ -p ] [ encodedfile... ]");
+}
+
+init(nil : ref Draw->Context, argv : list of string)
+{
+	fd : ref Sys->FD;
+
+	tostdout := 0;
+	sys = load Sys Sys->PATH;
+	str = load String String->PATH;
+	bufio = load Bufio Bufio->PATH;
+	argv = tl argv;
+	if (argv != nil && hd argv == "-p") {
+		tostdout = 1;
+		argv = tl argv;
+	}
+	if (argv != nil) {
+		for (; argv != nil; argv = tl argv) {
+			fd = sys->open(hd argv, Sys->OREAD);
+			if (fd == nil)
+				fatal(sys->sprint("cannot open %s", hd argv));
+			decode(fd, tostdout);
+		}
+	}
+	else
+		decode(sys->fildes(0), tostdout);
+}
+
+code(c : byte) : int
+{
+	return (int c - ' ')&16r3f;
+}
+
+LEN : con 45;
+			
+decode(ifd : ref Sys->FD, tostdout : int)
+{
+	mode : int;
+	ofile : string;
+
+	bio := bufio->fopen(ifd, Bufio->OREAD);
+	if (bio == nil)
+		fatal("cannot open input for buffered io: %r");
+	while ((s := bio.gets('\n')) != nil) {
+		if (len s >= 6 && s[0:6] == "begin ") {
+			(n, l) := sys->tokenize(s, " \n");
+			if (n < 3)
+				fatal("bad begin line");
+			(mode, nil) = str->toint(hd tl l, 8);
+			ofile = hd tl tl l;
+			break;
+		}
+	}
+	if (ofile == nil)
+		fatal("no begin line");
+	if (tostdout)
+		ofd := sys->fildes(1);
+	else {
+		if (ofile[0] == '~')	# ~user/file
+			ofile = "/usr/" + ofile[1:];
+		ofd = sys->create(ofile, Sys->OWRITE, 8r666);
+		if (ofd == nil)
+			fatal(sys->sprint("cannot create %s: %r", ofile));
+	}
+	ob := array[LEN] of byte;
+	while ((s = bio.gets('\n')) != nil) {
+		b := array of byte s;
+		n := code(b[0]);
+		if (n == 0 && (len b != 2 || b[1] != byte '\n'))
+			fatal("bad 0 count line");
+		if (n <= 0)
+			break;
+		if (n > LEN)
+			fatal("too many bytes on line");
+		e := 0; f := 0;
+		if (n%3 == 1) {
+			e = 2; f = 4;
+		}
+		else if (n%3 == 2) {
+			e = 3; f = 4;
+		}
+		if (len b < 4*(n/3)+e+2 || len b > 4*(n/3)+f+2)
+			fatal("bad uuencode count");
+		b = b[1:];
+		i := 0;
+		nl := n;
+		for (j := 0; nl > 0; j += 4) {
+			if (nl >= 1)
+				ob[i++] = byte (code(b[j+0])<<2 | code(b[j+1])>>4);
+			if (nl >= 2)
+				ob[i++] = byte (code(b[j+1])<<4 | code(b[j+2])>>2);
+			if (nl >= 3)
+				ob[i++] = byte (code(b[j+2])<<6 | code(b[j+3])>>0);
+			nl -= 3;
+		}
+		if (sys->write(ofd, ob, i) != i)
+			fatal("bad write to output: %r");	
+	}
+	s = bio.gets('\n');
+	if (s == nil || len s < 4 || s[0:4] != "end\n")
+		fatal("missing end line");
+	if (!tostdout) {
+		d := sys->nulldir;
+		d.mode = mode;
+		if (sys->fwstat(ofd, d) < 0)
+			fatal(sys->sprint("cannot wstat %s: %r", ofile));
+	}
+}