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+/* common.c - Common functions
+
+ Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
+ Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
+ Copyright (C) 2008-2013 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/>.
+
+ On Debian systems, the complete text of the GNU General Public License
+ can be found in /usr/share/common-licenses/GPL-3 file.
+*/
+
+/* FAT32, VFAT, Atari format support, and various fixes additions May 1998
+ * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#include "common.h"
+
+typedef struct _link {
+ void *data;
+ struct _link *next;
+} LINK;
+
+void die(char *msg, ...)
+{
+ va_list args;
+
+ va_start(args, msg);
+ vfprintf(stderr, msg, args);
+ va_end(args);
+ fprintf(stderr, "\n");
+ exit(1);
+}
+
+void pdie(char *msg, ...)
+{
+ va_list args;
+
+ va_start(args, msg);
+ vfprintf(stderr, msg, args);
+ va_end(args);
+ fprintf(stderr, ":%s\n", strerror(errno));
+ exit(1);
+}
+
+void *alloc(int size)
+{
+ void *this;
+
+ if ((this = malloc(size)))
+ return this;
+ pdie("malloc");
+ return NULL; /* for GCC */
+}
+
+void *qalloc(void **root, int size)
+{
+ LINK *link;
+
+ link = alloc(sizeof(LINK));
+ link->next = *root;
+ *root = link;
+ return link->data = alloc(size);
+}
+
+void qfree(void **root)
+{
+ LINK *this;
+
+ while (*root) {
+ this = (LINK *) * root;
+ *root = this->next;
+ free(this->data);
+ free(this);
+ }
+}
+
+int min(int a, int b)
+{
+ return a < b ? a : b;
+}
+
+char get_key(char *valid, char *prompt)
+{
+ int ch, okay;
+
+ while (1) {
+ if (prompt)
+ printf("%s ", prompt);
+ fflush(stdout);
+ while (ch = getchar(), ch == ' ' || ch == '\t') ;
+ if (ch == EOF)
+ exit(1);
+ if (!strchr(valid, okay = ch))
+ okay = 0;
+ while (ch = getchar(), ch != '\n' && ch != EOF) ;
+ if (ch == EOF)
+ exit(1);
+ if (okay)
+ return okay;
+ printf("Invalid input.\n");
+ }
+}