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implement Cat;
include "sys.m";
sys: Sys;
include "draw.m";
Cat: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
stdout: ref Sys->FD;
init(nil: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
stdout = sys->fildes(1);
args = tl args;
if(args == nil)
args = "-" :: nil;
for(; args != nil; args = tl args){
file := hd args;
if(file != "-"){
fd := sys->open(file, Sys->OREAD);
if(fd == nil){
sys->fprint(sys->fildes(2), "cat: cannot open %s: %r\n", file);
raise "fail:bad open";
}
cat(fd, file);
}else
cat(sys->fildes(0), "<stdin>");
}
}
cat(fd: ref Sys->FD, file: string)
{
buf := array[Sys->ATOMICIO] of byte;
while((n := sys->read(fd, buf, len buf)) > 0)
if(sys->write(stdout, buf, n) < n) {
sys->fprint(sys->fildes(2), "cat: write error: %r\n");
raise "fail:write error";
}
if(n < 0) {
sys->fprint(sys->fildes(2), "cat: error reading %s: %r\n", file);
raise "fail:read error";
}
}
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