ref: 1018d7a7091fd5e0433f501a3474cdc3fec322cc
dir: /appl/cmd/sum.b/
implement Sum; include "sys.m"; include "draw.m"; include "crc.m"; Sum : module { init : fn(nil : ref Draw->Context, argv : list of string); }; init(nil : ref Draw->Context, argv : list of string) { sys := load Sys Sys->PATH; stderr := sys->fildes(2); crcm := load Crc Crc->PATH; crcs := crcm->init(0, 0); a := tl argv; buf := array[Sys->ATOMICIO] of byte; err := 0; for ( ; a != nil; a = tl a) { s := hd a; (ok, d) := sys->stat(s); if (ok < 0) { sys->fprint(stderr, "sum: cannot get status of %s: %r\n", s); err = 1; continue; } if (d.mode & Sys->DMDIR) continue; fd := sys->open(s, Sys->OREAD); if (fd == nil) { sys->fprint(stderr, "sum: cannot open %s: %r\n", s); err = 1; continue; } crc := 0; nbytes := big 0; while((nr := sys->read(fd, buf, len buf)) > 0){ crc = crcm->crc(crcs, buf, nr); nbytes += big nr; } if(nr < 0) { sys->fprint(stderr, "sum: error reading %s: %r\n", s); err = 1; } # encode the length but make n==0 not 0 l := int (nbytes & big 16rFFFFFFFF); buf[0] = byte((l>>24)^16rCC); buf[1] = byte((l>>16)^16r55); buf[2] = byte((l>>8)^16rCC); buf[3] = byte(l^16r55); crc = crcm->crc(crcs, buf, 4); sys->print("%.8ux %6bd %s\n", crc, nbytes, s); crcm->reset(crcs); } if(err) raise "fail:error"; }