/* common.c  -  Common functions *//* Written 1993 by Werner Almesberger *//* 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");    }}/* Local Variables: *//* tab-width: 8     *//* End:             */