libf2c/libI77/rewind.c

   1 #include "config.h"
   2 #include "f2c.h"
   3 #include "fio.h"
   4 integer
   5 f_rew (alist * a)
   6 {
   7   unit *b;
   8   if (f__init & 2)
   9     f__fatal (131, "I/O recursion");
  10   if (a->aunit >= MXUNIT || a->aunit < 0)
  11     err (a->aerr, 101, "rewind");
  12   b = &f__units[a->aunit];
  13   if (b->ufd == NULL || b->uwrt == 3)
  14     return (0);
  15   if (!b->useek)
  16     err (a->aerr, 106, "rewind");
  17   if (b->uwrt)
  18     {
  19       (void) t_runc (a);
  20       b->uwrt = 3;
  21     }
  22   FSEEK (b->ufd, 0, SEEK_SET);
  23   b->uend = 0;
  24   return (0);
  25 }