read_file.c

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

// reads text from path to source 
void read_file (char path[], char **source) {
    FILE *f = fopen(path, "r");
    fseek(f, 0, SEEK_END);
    long fsize = ftell(f);
    fseek(f, 0, SEEK_SET);

    *source = malloc(fsize + 1);
    fread(*source, fsize, 1, f);
    fclose(f);

    // *source[fsize]='\0'; // this line causes a segfault
}

int main(){
    char path[] = "read_file.c";

    char *source;
    read_file(path, &source);

    printf("Source file:\n%s\n", source);

    return 0;
}