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FILE* f;
char *editor;

f = fopen("Sensitive.txt", "r");
if (fdf == NULL) {
  /* Handle fopen() error */
}
/* ... */
editor = getenv("EDITOR");
if (editor == NULL) {
  /* Handle getenv() error */
}
system(editor);

FILE* f;
char *editor;

f = fopen("Sensitive.txt", "r");
if (fdf == NULL) {
  /* Handle fopen() error */
}
/* ... */
fclose(f);
editor = getenv("EDITOR");
if (editor == NULL) {
  /* Handle getenv() error */
}