ref: 3efb5bbb4061056e523858b134c555949591efe2
dir: /appl/cmd/uuencode.b/
implement Uuencode; include "sys.m"; sys : Sys; include "draw.m"; Uuencode : 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: uuencode [ sourcefile ] remotefile"); } init(nil : ref Draw->Context, argv : list of string) { fd : ref Sys->FD; mode : int; sys = load Sys Sys->PATH; argv = tl argv; if (argv == nil) usage(); if (tl argv != nil) { fd = sys->open(hd argv, Sys->OREAD); if (fd == nil) fatal(sys->sprint("cannot open %s", hd argv)); (ok, d) := sys->fstat(fd); if (ok < 0) fatal(sys->sprint("cannot stat %s: %r", hd argv)); if (d.mode & Sys->DMDIR) fatal("cannot uuencode a directory"); mode = d.mode; argv = tl argv; } else { fd = sys->fildes(0); mode = 8r666; } if (tl argv != nil) usage(); sys->print("begin %o %s\n", mode, hd argv); encode(fd); sys->print("end\n"); } LEN : con 45; code(c : int) : byte { return byte ((c&16r3f) + ' '); } encode(ifd : ref Sys->FD) { c, d, e : int; ofd := sys->fildes(1); ib := array[LEN] of byte; ob := array[4*LEN/3 + 2] of byte; for (;;) { n := sys->read(ifd, ib, LEN); if (n < 0) fatal("cannot read input file: %r"); if (n == 0) break; i := 0; ob[i++] = code(n); for (j := 0; j < n; j += 3) { c = int ib[j]; ob[i++] = code((0<<6)&16r00 | (c>>2)&16r3f); if (j+1 < n) d = int ib[j+1]; else d = 0; ob[i++] = code((c<<4)&16r30 | (d>>4)&16r0f); if (j+2 < n) e = int ib[j+2]; else e = 0; ob[i++] = code((d<<2)&16r3c | (e>>6)&16r03); ob[i++] = code((e<<0)&16r3f | (0>>8)&16r00); } ob[i++] = byte '\n'; if (sys->write(ofd, ob, i) != i) fatal("bad write to output: %r"); } ob[0] = code(0); ob[1] = byte '\n'; if (sys->write(ofd, ob, 2) != 2) fatal("bad write to output: %r"); }