ref: 5edeca01b0622463a65c126ebcc29314013fd928
dir: /appl/cmd/xd.b/
implement Xd;
#
# based on Plan9 xd
#
include "sys.m";
include "draw.m";
include "bufio.m";
Xd: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
sys : Sys;
bufio : Bufio;
Iobuf : import bufio;
stdin, stdout, stderr : ref Sys->FD;
wbytes := array [] of {
1,
2,
4,
8,
};
fmtchars : con "odx";
fmtbases := array [] of {
8,
10,
16,
};
fwidths := array [] of {
3, # 1o
3, # 1d
2, # 1x
6, # 2o
5, # 2d
4, # 2x
11, # 4o
10, # 4d
8, # 4x
22, # 8o
20, # 8d
16, # 8x
};
bytepos := array [16] of { * => 0 };
formats := array [10] of (int, int, int); # (nbytes, base, fieldwidth)
nformats := 0;
addrbase := 16;
repeats := 0;
swab := 0;
flush := 0;
addr := big 0;
output : ref Iobuf;
pad : string;
init(nil : ref Draw->Context, argv : list of string)
{
sys = load Sys Sys->PATH;
stdin = sys->fildes(0);
stdout = sys->fildes(1);
stderr = sys->fildes(2);
bufio = load Bufio Bufio->PATH;
if (bufio == nil) {
sys->fprint(stderr, "cannot load bufio: %r\n");
raise "fail:init";
}
output = bufio->fopen(stdout, Sys->OWRITE);
if (argv == nil)
raise "fail:bad argv";
pad = string array [32] of { * => byte ' ' };
for (argv = tl argv; argv != nil; argv = tl argv) {
arg := hd argv;
if (arg == nil)
continue;
if (arg[0] != '-')
break;
if (len arg == 2) {
case arg[1] {
'c' =>
addformat(0, 256);
'r' =>
repeats = 1;
's' =>
swab = 1;
'u' =>
flush = 1;
* =>
usage();
}
continue;
}
# XXX should allow -x1, -x
if (len arg == 3) {
n := 0;
baseix := strchr(fmtchars,arg[2]);
if (baseix == -1)
usage();
case arg[1] {
'a' =>
addrbase = fmtbases[baseix];
continue;
'b' or '1' => n = 0;
'w' or '2' => n = 1;
'l' or '4' => n = 2;
'v' or '8' => n = 3;
* =>
usage();
}
addformat(n, baseix);
continue;
}
usage();
}
if (nformats == 0)
addformat(2, 2); # "4x"
if (argv == nil)
dump(nil, 0);
else if (tl argv == nil)
dump(hd argv, 0);
else {
for (; argv != nil; argv = tl argv) {
dump(hd argv, 1);
}
}
}
usage()
{
sys->fprint(stderr, "usage: xd [-u] [-r] [-s] [-a{odx}] [-c|{b1w2l4v8}{odx}] ... file ...\n");
raise "fail:usage";
}
strchr(s : string, ch : int) : int
{
for (ix := 0; ix < len s; ix++)
if (s[ix] == ch)
return ix;
return -1;
}
addformat(widix, baseix : int)
{
nbytes := wbytes[widix];
if (nformats >= len formats) {
sys->fprint(stderr, "xd: too many formats\n");
raise "fail:error";
}
fw : int;
if (baseix == 256) {
# special -c case
formats[nformats++] = (nbytes, 256, 2);
fw = 2;
} else {
fw = fwidths[baseix + (widix *len fmtbases)];
formats[nformats++] = (nbytes, fmtbases[baseix], fw);
}
bpos := 0;
for (ix := 0; ix < 16; ix += nbytes) {
if (bytepos[ix] >= bpos)
bpos = bytepos[ix];
else {
d := bpos - bytepos[ix];
for (dix := ix; dix < 16; dix++)
bytepos[dix] += d;
}
bpos += fw + 1;
}
}
dump(path : string, title : int)
{
input := bufio->fopen(stdin, Sys->OREAD);
zeros := array [16] of {* => byte 0};
if (path != nil) {
input = bufio->open(path, Sys->OREAD);
if (input == nil) {
sys->fprint(stderr, "xd: cannot open %s: %r\n", path);
raise "fail:cannot open";
}
}
if (title) {
output.puts(path);
output.putc('\n');
}
addr = big 0;
star := 0;
obuf: array of byte;
for (;;) {
n := 0;
buf := array [16] of byte;
while (n < 16 && (r := input.read(buf[n:], 16 - n)) > 0)
n += r;
if (n < 16)
buf[n:] = zeros[n:];
if (swab)
doswab(buf);
if (n == 16 && repeats) {
if (obuf != nil && buf[0]==obuf[0]) {
for (i := 0; i < 16; i++)
if (obuf[i] != buf[i])
break;
if (i == 16) {
addr += big 16;
if (star == 0) {
star++;
output.puts("*\n");
}
continue;
}
}
obuf = buf;
star = 0;
}
for (fmt := 0; fmt < nformats; fmt++) {
if (fmt == 0)
output.puts(big2str(addr, 7, addrbase, '0'));
else
output.puts(big2str(addr, 7, addrbase, ' '));
output.putc(' ');
(w, b, fw) := formats[fmt];
pdata(fw, w, b, n, buf);
output.putc('\n');
if (flush)
output.flush();
}
addr += big n;
if (n < 16) {
output.puts(big2str(addr, 7, addrbase, '0'));
output.putc('\n');
if (flush)
output.flush();
break;
}
}
output.flush();
}
hexchars : con "0123456789abcdef";
big2str(b : big, minw, base, padc : int) : string
{
s := "";
do {
d := int (b % big base);
s[len s] = hexchars[d];
b /= big base;
} while (b > big 0);
t := "";
if (len s < minw)
t = string array [minw] of { * => byte padc };
else
t = s;
for (i := len s - 1; i >= 0; i--)
t[len t - 1 - i] = s[i];
return t;
}
pdata(fw, n, base, dlen : int, data : array of byte)
{
nout := 0;
text := "";
for (i := 0; i < dlen; i += n) {
if (i != 0) {
padlen := bytepos[i] - nout;
output.puts(pad[0:padlen]);
nout += padlen;
}
if (base == 256) {
# special -c case
ch := int data[i];
case ch {
'\t' => text = "\\t";
'\r' => text = "\\r";
'\n' => text = "\\n";
'\b' => text = "\\b";
* =>
if (ch >= 16r7f || ' ' > ch)
text = sys->sprint("%.2x", ch);
else
text = sys->sprint("%c", ch);
}
} else {
v := big data[i];
for (ix := 1; ix < n; ix++)
v = (v << 8) + big data[i+ix];
text = big2str(v, fw, base, '0');
}
output.puts(text);
nout += len text;
}
}
doswab(b : array of byte)
{
ix := 0;
for (i := 0; i < 4; i++) {
(b[ix], b[ix+3]) = (b[ix+3], b[ix]);
(b[ix+1], b[ix+2]) = (b[ix+2], b[ix+1]);
ix += 4;
}
}