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+/* common.h - Common functions
+
+ Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
+ Copyright (C) 2008-2014 Daniel Baumann <mail@daniel-baumann.ch>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ The complete text of the GNU General Public License
+ can be found in /usr/share/common-licenses/GPL-3 file.
+*/
+
+#ifndef _COMMON_H
+#define _COMMON_H
+
+void die(const char *msg, ...) __attribute((noreturn));
+
+/* Displays a prinf-style message and terminates the program. */
+
+void pdie(const char *msg, ...) __attribute((noreturn));
+
+/* Like die, but appends an error message according to the state of errno. */
+
+void *alloc(int size);
+
+/* mallocs SIZE bytes and returns a pointer to the data. Terminates the program
+ if malloc fails. */
+
+void *qalloc(void **root, int size);
+
+/* Like alloc, but registers the data area in a list described by ROOT. */
+
+void qfree(void **root);
+
+/* Deallocates all qalloc'ed data areas described by ROOT. */
+
+int min(int a, int b);
+
+/* Returns the smaller integer value of a and b. */
+
+char get_key(const char *valid, const char *prompt);
+
+/* Displays PROMPT and waits for user input. Only characters in VALID are
+ accepted. Terminates the program on EOF. Returns the character. */
+
+#endif