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#include "f2c.h"
#include "fio.h"
extern char *mkstemp(), *strcpy();
integer f_end(a) alist *a;
{
unit *b;
if(a->aunit>=MXUNIT || a->aunit<0) err(a->aerr,101,"endfile");
b = &units[a->aunit];
if(b->ufd==NULL) {
char nbuf[10];
(void) sprintf(nbuf,"fort.%ld",a->aunit);
close(creat(nbuf, 0666));
return(0);
}
b->uend=1;
return(b->useek ? t_runc(a) : 0);
}
static int
copy(from, len, to)
char *from, *to;
register int len;
{
register int n;
int k, rc = 0, tmp;
char buf[BUFSIZ];
if ((k = open(from, 0)) < 0)
return 1;
if ((tmp = creat(to,0666)) < 0)
return 1;
while((n = read(k, buf, len > BUFSIZ ? BUFSIZ : (int)len)) > 0) {
if (write(tmp, buf, n) != n)
{ rc = 1; break; }
if ((len -= n) <= 0)
break;
}
close(k);
close(tmp);
return n < 0 ? 1 : rc;
}
t_runc(a) alist *a;
{
char nm[16];
int loc, len;
unit *b;
int rc = 0;
b = &units[a->aunit];
if(b->url) return(0); /*don't truncate direct files*/
loc=ftell(b->ufd);
(void) fseek(b->ufd,0L,2);
len=ftell(b->ufd);
if (loc >= len || b->useek == 0 || b->ufnm == NULL)
return(0);
rewind(b->ufd); /* empty buffer */
if (!loc) {
if (close(creat(b->ufnm,0666)))
{ rc = 1; goto done; }
if (b->uwrt)
b->uwrt = 1;
return 0;
}
(void) strcpy(nm,"tmp.FXXXXXX");
(void) mkstemp(nm);
if (copy(b->ufnm, loc, nm)
|| copy(nm, loc, b->ufnm))
rc = 1;
unlink(nm);
done:
fseek(b->ufd, loc, 0);
if (rc)
err(a->aerr,111,"endfile");
return 0;
}
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