Comparing string in file

I am trying to print this line of code to the HTML file when my file reads the character "form". However, I keep failing and I have no idea how to do it. Please help

fgets(str,999,p);

while (!feof(p)) {
    if (strstr("form", str) != NULL) {
        printf("<input type=\"hidden\" name=\"gold\" value=\"%d\"", goldpieces);
    }

    printf("%s", str);
    fgets(str,999,p);
}

fclose(p);
return 0;