+
+#ifdef DEBUG
+static FILE *debug_fp = NULL;
+
+void dputs(char *buf)
+{
+ if (!debug_fp) {
+ debug_fp = fopen("debug.log", "w");
+ }
+
+ write(1, buf, strlen(buf));
+
+ fputs(buf, debug_fp);
+ fflush(debug_fp);
+}
+#endif
+
+char *get_username(void)
+{
+ struct passwd *p;
+ uid_t uid = getuid();
+ char *user, *ret = NULL;
+
+ /*
+ * First, find who we think we are using getlogin. If this
+ * agrees with our uid, we'll go along with it. This should
+ * allow sharing of uids between several login names whilst
+ * coping correctly with people who have su'ed.
+ */
+ user = getlogin();
+ setpwent();
+ if (user)
+ p = getpwnam(user);
+ else
+ p = NULL;
+ if (p && p->pw_uid == uid) {
+ /*
+ * The result of getlogin() really does correspond to
+ * our uid. Fine.
+ */
+ ret = user;
+ } else {
+ /*
+ * If that didn't work, for whatever reason, we'll do
+ * the simpler version: look up our uid in the password
+ * file and map it straight to a name.
+ */
+ p = getpwuid(uid);
+ if (!p)
+ return NULL;
+ ret = p->pw_name;
+ }
+ endpwent();
+
+ return dupstr(ret);
+}