strstr() causing a segmentation fault error - c

Question

The objective here is to take a whole text file that I dump into a buffer and then use the strcasestr() function to find the pointer of the word I am looking for within my buffer. It constantly gives me the segmentation fault error. At first, I thought it may be size so I tried with smaller sizes but it doesn't work either. The function only works with strings I create inside the actual code (ex : char * bob = "bob"; char * bobsentence = "bob is cool"; strstr(bobsentence, bob);). Which leads me to believe it has something to do with the fgets(). Any help is appreciated, really stuck on this one.
#define _GNU_SOURCE //to use strcasestr
#include <unistd.h>
#include <sys/types.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
void textEdit(char *path, char *word){
printf("%s\n", path);
FILE *textFile;
//FILE *locationFile;
//FILE *tempFile;
char counter[1024];
int count = 0;
textFile = fopen(path, "r+");
//locationFile = fopen(path, "r+");
//opens file to read and write and opens temp file to write
if( textFile == NULL){ //|| tempFile == NULL || locationFile == NULL) ) {
printf ("\nerror\n");
return;
}
// SECTION : ALLOCATES MEMORY NEEDED FOR COPY TEXT IN ARRAY
// finds number of lines to estimate total size of array needed for buffer
while((fgets(counter, sizeof(counter), textFile)) != NULL){
count++;
}
fclose(textFile);
FILE *tempFile = fopen(path, "r+");
count *= 1024;
printf("%d %zu\n",count, sizeof(char));
char *buffer = malloc(count); //1024 is the max number of characters per line in a traditional txt
if(buffer == NULL){ //error with malloc
return;
}
// SECTION : DUMPS TEXT INTO ARRAY
if(fgets(buffer, count, tempFile) == NULL){
printf("error");
} //dumps all text into array
printf("%s\n", buffer);
char * searchedWord;
while((searchedWord = strcasestr(buffer, word)) != NULL){
}
fclose(tempFile);
//fclose(locationFile);
free(buffer);
}

Answer 1

It looks that you forgot to initialize count variable to 0:
int count = 0;
You increment it and it can contain any random value, even negative.
Also, note that your utilization of strstr doesn't look correct. The function returns the pointer to first occurrence that matches. Note, that it doesn't remember already found matches, so if match exists it should loop forever in this loop. Instead it should look like:
char *pos = buffer;
while((pos = strcasestr(pos, word)) != NULL){
searchedWord = pos;
/* do something with searchedWord but remember that it belongs to
allocated buffer and can't be used after free() */
pos++;
}