Random access to a file

/* 2201.c: Random access to a file */
#include <stdio.h>

enum {SUCCESS, FAIL, MAX_LEN = 80};

void PtrSeek(FILE *fptr);
long PtrTell(FILE *fptr);
void DataRead(FILE *fptr);
int ErrorMsg(char *str);

main(void)
{
FILE *fptr;
char filename[]= "test1.txt";
int reval = SUCCESS;

if ((fptr = fopen(filename, "r")) == NULL){
reval = ErrorMsg(filename);
} else {
PtrSeek(fptr);
fclose(fptr);
}

return reval;
}
/* function definition */
void PtrSeek(FILE *fptr)
{
long offset1, offset2, offset3;

offset1 = PtrTell(fptr);
DataRead(fptr);
offset2 = PtrTell(fptr);
DataRead(fptr);
offset3 = PtrTell(fptr);
DataRead(fptr);

printf("\nRe-read the haiku:\n");
/* re-read the third verse of the haiku */
fseek(fptr, offset3, SEEK_SET);
DataRead(fptr);
/* re-read the second verse of the haiku */
fseek(fptr, offset2, SEEK_SET);
DataRead(fptr);
/* re-read the first verse of the haiku */
fseek(fptr, offset1, SEEK_SET);
DataRead(fptr);
}
/* function definition */
long PtrTell(FILE *fptr)
{
long reval;

reval = ftell(fptr);
printf("The fptr is at %ld\n", reval);

return reval;
}
/* function definition */
void DataRead(FILE *fptr)
{
char buff[MAX_LEN];

fgets(buff, MAX_LEN, fptr);
printf("---%s", buff);
}
/* function definition */
int ErrorMsg(char *str)
{
printf("Cannot open %s.\n", str);
return FAIL;
}