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