ftell & fgetpos bug in b18.

[Stephen Bailey <steph at candide dot cs dot uchicago dot edu>]

ftell and fgetpos report incorrect positions under some circumstances
in B18.  I am running on Windows NT 4.0 (SP3).

If you run the program included below with the /* comment me out */
line commented out, ftell erroneously reports ``5'' for the position
in the (existing, and sufficiently large) file foo.txt.  With this
line in, ftell correctly reports ``2'' as the position in the input
file.

Steph

------------------------ftelltst.c------------------------------------
#include <stdio.h>

main ()
{
  FILE *f;
  long int p;
  int c;

  f = fopen("foo.txt", "r");
  (void) ftell(f); /* comment me out */
  c = getc(f);
  c = getc(f);
  p = ftell(f);
  fprintf(stderr,"Position: %d\n", p);
  
}
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