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

function

<cstdio>

int fsetpos ( FILE * stream, const fpos_t * pos );

Set position indicator of stream

The internal file position indicator associated with stream is set to the position represented by pos, which is a pointer to an fpos_t object whose value shall have been previously obtained by a call to fgetpos.

The end-of-file internal indicator of the stream is cleared after a successful call to this function, and all effects from previous calls to ungetc on this stream are dropped.

On streams open for update (read+write), a call to fsetpos allows to switch between reading and writing.

A similar function, fseek, can be used to set arbitrary positions on streams open in binary mode.

stream

Pointer to a FILE object that identifies the stream.

position

Pointer to a fpos_t object containing a position previously obtained with fgetpos.

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/* fsetpos example */
#include <stdio.h>

int main ()
{
  FILE * pFile;
  fpos_t position;

  pFile = fopen ("myfile.txt","w");
  fgetpos (pFile, &position);
  fputs ("That is a sample",pFile);
  fsetpos (pFile, &position);
  fputs ("This",pFile);
  fclose (pFile);
  return 0;
}

fgetpos

Get current position in stream (function)

fseek

Reposition stream position indicator (function)

rewind

Set position of stream to the beginning (function)

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