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#include <sys/types.h>
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#include <unistd.h>
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#include <string.h>
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/* bsd extensions */
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include "priv.h"
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int
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writev(int fd, struct iovec *v, int ent)
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{
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	int i, n, written;
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	char *t, *e, *f;
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	char buf[10*1024];
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	written = 0;
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	t = buf;
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	e = buf+sizeof(buf);
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	for(;ent ; v++, ent--){
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		n = v->iov_len;
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		f = v->iov_base;
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		while(n > 0){
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			i = e-t;
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			if(n < i){
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				memmove(t, f, n);
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				t += n;
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				break;
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			}
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			memmove(t, f, i);
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			n -= i;
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			f += i;
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			i = write(fd, buf, sizeof(buf));
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			if(i < 0){
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				if(written > 0){
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					return written;
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				}else{
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					_syserrno();
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					return -1;
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				}
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			}
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			written += i;
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			if(i != sizeof(buf)) {
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				return written;
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			}
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			t = buf;
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		}
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	}
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	i = t - buf;
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	if(i > 0){
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		n = write(fd, buf, i);
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		if(n < 0){
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			if(written == 0){
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				_syserrno();
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				return -1;
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			}
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		} else
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			written += n;
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	}
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	return written;
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}