open file read into buffer

#include <stdio.h>
#include <stdlib.h>

char *readIntoBuffer(FILE *fp);


int random_int(int min, int max)
{
   return min + rand() % (max+1 - min);
}


FILE * openfile(char *file) {
FILE *fptr;
fptr = fopen(file,"r");
if(fptr==NULL){
printf("FILE B NULL\n");
exit(1);
}
return fptr;
}
void printFile(char *f)
{
size_t sz=strlen(f);
  for(int i=0;i<sz;i++){
     printf("%c",f[i]);
  }
}


void printRandomWords(char *w);

void mess1(){
printf("Enter a filename "
"to be opened\n");
}
void mess2(){
printf("HEY, WHAT DID I TELL YOU?\n"
"Now you have to start out "
"all over again\n");
}


int main(int argc, char **argv){
char *fp;
mess1();

if(argc<2){
mess2();
exit(1);
}

fp = strdup(argv[1]);
FILE *file = openfile(fp);
char *s=readIntoBuffer(file);
printFile(s);
printf("\n");
printRandomWords(s);
free(s);
fclose(file);
return 0;
}

char *readIntoBuffer(FILE *fp){
// unknown file size
char *source = NULL;

    /* Go to the end of the file. */
    if (fseek(fp, 0L, SEEK_END) == 0) {
        /* Get the size of the file. */
        long bufsize = ftell(fp);
        if (bufsize == -1) { /* Error */ }

    /* Allocate our buffer to that size. */
      source =
      malloc(sizeof(char) * (bufsize + 1));

    /* Go back to the start of the file. */
      if (fseek(fp, 0L, SEEK_SET) != 0)
	{ /* Error */ }

   /* Read the entire file into memory. */
      size_t newLen =
       fread(source, sizeof(char),
       bufsize, fp);
        if ( ferror( fp ) != 0 ) {
            fputs("Error reading file",
             stderr);
        } else {
            source[newLen++] = '\0';
          /* Just to be safe add EOF */
        }
    }
return source;
}


void printRandomWords(char *w){
/*
get x amount of random words
from sorce store in an array
for later use,return type should
then be changed, or print
ramdom words from source.

code goes here.
*/
size_t sz=strlen(w);
//printf("%zu\n",sz);
char *token;
int c=0,ct,ct2;

ct=random_int(2,sz-30);
printf("ran %d\n\n",ct);
  token=strtok(w, " ");
  while(token != NULL){
      for(int i=0;i<ct;i++)
          ; /* move down x amount
               before start
               grabbing "random" words */
    if(c==5){
       printf("%s\n",token);
       c=0;
     }

  token=strtok(NULL, " ");
  c++;
 }

}