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Showing content from https://cplusplus.com/reference/cstdio/fgetpos/ below:

function

fgetpos

int fgetpos ( FILE * stream, fpos_t * pos );

Get current position in stream

Retrieves the current position in the stream.

The function fills the fpos_t object pointed by pos with the information needed from the stream's position indicator to restore the stream to its current position (and multibyte state, if wide-oriented) with a call to fsetpos.

The ftell function can be used to retrieve the current position in the stream as an integer value.

Parameters

stream: Pointer to a FILE object that identifies the stream.
pos: Pointer to a fpos_t object.
This should point to an object already allocated.

Return Value On success, the function returns zero.
In case of error, errno is set to a platform-specific positive value and the function returns a non-zero value.

Example

/* fgetpos example */
#include <stdio.h>
int main ()
{
   FILE * pFile;
   int c;
   int n;
   fpos_t pos;

   pFile = fopen ("myfile.txt","r");
   if (pFile==NULL) perror ("Error opening file");
   else
   {
     c = fgetc (pFile);
     printf ("1st character is %c\n",c);
     fgetpos (pFile,&pos);
     for (n=0;n<3;n++)
     {
        fsetpos (pFile,&pos);
        c = fgetc (pFile);
        printf ("2nd character is %c\n",c);
     }
     fclose (pFile);
   }
   return 0;
}

Possible output (with myfile.txt containing ABC):

1st character is A
2nd character is B
2nd character is B
2nd character is B

The example opens myfile.txt, then reads the first character once, and then reads 3 times the same second character.