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/* common.h - Common functions
Copyright (C) 1993 Werner Almesberger <>
Copyright (C) 2008-2014 Daniel Baumann <>
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
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 <>.
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. */