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#include "internal.h"
#define MAXHEADERS 20
static io·Header *tracked[MAXHEADERS];
static int doexit;
static void
untrackall(void *arg)
{
int i;
io·Header *it;
for(i=0; i < MAXHEADERS; i++){
it = tracked[i];
if(it){
tracked[i] = nil;
io·flush(it);
}
}
}
static void
untrack(io·Header *io)
{
int i;
for(i=0; i<arrlen(tracked); i++){
if(tracked[i] == io)
tracked[i] = nil;
}
}
static void
track(io·Header *io)
{
int i;
untrack(io);
for(i=0; i<arrlen(tracked); i++){
if(!tracked[i]){
tracked[i] = io;
break;
}
}
if(!doexit){
doexit = 1;
rt·atexit(untrackall, nil);
}
}
int
io·initcap(io·Header *io, int fd, int mode, int cap, uchar *buf)
{
buf += io·BufUngets;
cap += io·BufUngets;
switch(mode & ~(sys·OCloseExec|sys·OTrunc)){
default:
/* fmt·fprint(2, "initcap: unknown mode %d\n" , mode); */
return io·BufErr;
case sys·ORead:
io->state = io·BufRdr;
io->olen = 0;
break;
case sys·OWrite:
track(io);
io->state = io·BufWtr;
io->olen = -cap;
break;
}
io->b = buf;
io->e = buf+cap;
io->g = io->e;
io->fd = fd;
io->cap = cap;
io->pos = io->runesz = io->flag = io->ilen = io->nread = 0;
return 0;
}
int
io·init(io·Buffer *io, int fd, int mode)
{
return io·initcap(header(io), fd, mode, io·BufLen + io·BufUngets, io->bytes);
}
int
io·close(io·Header *io)
{
int err;
untrack(io);
err = io·flush(io);
if(io->flag == io·BufMagic){
io->flag = 0;
if((err=sys·close(io->fd)))
return err;
}
return 0;
}
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