summaryrefslogtreecommitdiff
path: root/lib/yesno.c
blob: 44c437caf7bb3b7c0e7ae8bb8fa0637595f6f088 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
/* yesno.c -- read a yes/no response from stdin
   Copyright (C) 1990 Free Software Foundation, Inc.

   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 2, 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, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <ctype.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#include <stdio.h>

/* Read one line from standard input
   and return nonzero if that line begins with y or Y,
   otherwise return 0. */

int rpmatch ();

int
yesno ()
{
  /* We make some assumptions here:
     a) leading white space in the response are not vital
     b) the first 128 characters of the answer are enough (the rest can
	be ignored)
     I cannot think for a situation where this is not ok.  --drepper@gnu  */
  char buf[128];
  int len = 0;
  int c;

  while ((c = getchar ()) != EOF && c != '\n')
    if ((len > 0 && len < 127) || (len == 0 && !isspace (c)))
      buf[len++] = c;
  buf[len] = '\0';

  return rpmatch (buf) == 1;
}