safe_fopen
extern FILE *safe_fopen(const char *filename, const char *smode, int perms);
extern FILE *safe_fopen();
if ((df = safe_fopen(increm, "r+", 0664)) == (FILE *)NULL) {
if ((df = safe_fopen(dirfile, "w", 0600)) == (FILE *)NULL) {
if ((mf = safe_fopen(modefile, "w", 0600)) == (FILE *)NULL) {
extern FILE *safe_fopen(const char *filename, const char *smode, int perms);
extern FILE *safe_fopen();
if ((fp = safe_fopen(filename, "w", 0600)) == (FILE *)NULL) {