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Description of problem:
 *** Notes: CADENCE_RD  21-OCT-2004 13:26:25
Incorrect results returned by ftell()

The problem can be reproduced with the following two C programs.

main1.c
-------
#include <stdio.h>
main() {

int a = 0, b = 0;
int c, code, position;
FILE *fd;

fd = fopen("input.dat","r");
a = fgetc(fd);
b = fgetc(fd);
code = fgetc(fd);
c = 'c';
code = ungetc(c, fd);
position = ftell(fd);
printf("c - ungetc. position = %d\n", position);
a = fgetc(fd);
position = ftell(fd);
printf("c - getc. position = %d\n", position);
fclose(fd);
}

main2.c
-------
#include <stdio.h>
main() {

int a = 0, b = 0, ci;
int c, code, position;
FILE *fd;

fd = fopen("input.dat","r");

a = fgetc(fd);
b = fgetc(fd);

code = fgetc(fd);

c = 'c';
code = ungetc(c, fd);
a = fgetc(fd);

position = ftell(fd);
printf("c - ungetc. position = %d\n", position);

fscanf(fd, "%x %x %x", &a, &b, &ci);
printf("a, b, ci = %x, %x, %x\n", a, b, ci);

fscanf(fd, "%x %x %x", &a, &b, &ci);
printf("a, b, ci = %x, %x, %x\n", a, b, ci);

fseek(fd, position, 0);
fscanf(fd, "%x %x %x", &a, &b, &ci);
printf("a, b, ci = %x, %x, %x\n", a, b, ci);

fflush(fd);

rewind(fd);

a = fgetc(fd);
printf("a, b, ci = %x, %x, %x\n", a, b, ci);

fclose(fd);
}

input.dat:
----------
aab
11111111    00000000     1
11111111    11111111     0
00000000    11111111     0


Note: In main1.c, if we add an ftell() call right after the fopen(),
the problem won't show.  However, doing the same thing to main2.c
won't avoid the problem.

Version-Release number of selected component (if applicable):
glibc-headers-2.3.2-95.28

How reproducible:
Always

Steps to Reproduce:
1.run above test cases
2.
3.
    

Actual Results:  ftell() returns incorrect info

Expected Results:  ftell() returns correct info

Additional info: