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#include "f2c.h"
#include "fio.h"
#ifdef KR_headers
integer f_rew(a) alist *a;
#else
integer f_rew(alist *a)
#endif
{
unit *b;
if(a->aunit>=MXUNIT || a->aunit<0)
err(a->aerr,101,"rewind");
b = &f__units[a->aunit];
if(b->ufd == NULL || b->uwrt == 3)
return(0);
if(!b->useek)
err(a->aerr,106,"rewind")
if(b->uwrt) {
(void) t_runc(a);
b->uwrt = 3;
}
rewind(b->ufd);
b->uend=0;
return(0);
}
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