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#include "buffer.h"
#include "byte.h"
#include "error.h"
static int oneread(int (*op)(),int fd,char *buf,unsigned int len)
{
int r;
for (;;) {
r = op(fd,buf,len);
if (r == -1) if (errno == error_intr) continue;
return r;
}
}
static int getthis(buffer *s,char *buf,unsigned int len)
{
if (len > s->p) len = s->p;
s->p -= len;
byte_copy(buf,len,s->x + s->n);
s->n += len;
return len;
}
int buffer_feed(buffer *s)
{
int r;
if (s->p) return s->p;
r = oneread(s->op,s->fd,s->x,s->n);
if (r <= 0) return r;
s->p = r;
s->n -= r;
if (s->n > 0) byte_copyr(s->x + s->n,r,s->x);
return r;
}
int buffer_bget(buffer *s,char *buf,unsigned int len)
{
int r;
if (s->p > 0) return getthis(s,buf,len);
if (s->n <= len) return oneread(s->op,s->fd,buf,s->n);
r = buffer_feed(s); if (r <= 0) return r;
return getthis(s,buf,len);
}
int buffer_get(buffer *s,char *buf,unsigned int len)
{
int r;
if (s->p > 0) return getthis(s,buf,len);
if (s->n <= len) return oneread(s->op,s->fd,buf,len);
r = buffer_feed(s); if (r <= 0) return r;
return getthis(s,buf,len);
}
char *buffer_peek(buffer *s)
{
return s->x + s->n;
}
void buffer_seek(buffer *s,unsigned int len)
{
s->n += len;
s->p -= len;
}