1/*
2 * FreeBSD install - a package for the installation and maintenance
3 * of non-core utilities.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * Jordan K. Hubbard
15 * 18 July 1993
16 *
17 * Miscellaneous message routines.
18 *
19 */
20
21#include <sys/cdefs.h>
22__FBSDID("$FreeBSD$");
23
24#include "lib.h"
25#include <err.h>
26#include <paths.h>
27
28/* Die a relatively simple death */
29void
30upchuck(const char *message)
31{
32    cleanup(0);
33    errx(1, "fatal error during execution: %s", message);
34}
35
36/*
37 * As a yes/no question, prompting from the varargs string and using
38 * default if user just hits return.
39 */
40Boolean
41y_or_n(Boolean def, const char *msg, ...)
42{
43    va_list args;
44    int ch = 0;
45    FILE *tty;
46
47    va_start(args, msg);
48    /*
49     * Need to open /dev/tty because file collection may have been
50     * collected on stdin
51     */
52    tty = fopen(_PATH_TTY, "r");
53    if (!tty) {
54	cleanup(0);
55	errx(2, "can't open %s!", _PATH_TTY);
56    }
57    while (ch != 'Y' && ch != 'N') {
58	vfprintf(stderr, msg, args);
59	if (def)
60	    fprintf(stderr, " [yes]? ");
61	else
62	    fprintf(stderr, " [no]? ");
63	fflush(stderr);
64	if (AutoAnswer) {
65	    ch = (AutoAnswer == YES) ? 'Y' : 'N';
66	    fprintf(stderr, "%c\n", ch);
67	}
68	else
69	    ch = toupper(fgetc(tty));
70	if (ch == '\n')
71	    ch = (def) ? 'Y' : 'N';
72    }
73    fclose(tty) ;
74    va_end(args);
75    return (ch == 'Y') ? TRUE : FALSE;
76}
77