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annotate lib/yesno.c @ 4686:70bf7ce55a75

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(main): Define with a prototype.
author Paul Eggert <eggert@cs.ucla.edu>
date Thu, 11 Sep 2003 08:46:51 +0000
parents 318c378b409b
children 3f479e57aac3
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1 /* yesno.c -- read a yes/no response from stdin
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2 Copyright (C) 1990, 1998, 2001, 2003 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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17
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18 #if HAVE_CONFIG_H
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19 # include <config.h>
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20 #endif
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22 #include <ctype.h>
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23 #include <stdlib.h>
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24 #include <stdio.h>
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25 #include "unlocked-io.h"
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26
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27 /* Read one line from standard input
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28 and return nonzero if that line begins with y or Y,
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29 otherwise return 0. */
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30
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31 extern int rpmatch (char const *response);
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33 int
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34 yesno (void)
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35 {
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36 /* We make some assumptions here:
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37 a) leading white space in the response are not vital
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38 b) the first 128 characters of the answer are enough (the rest can
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39 be ignored)
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40 I cannot think for a situation where this is not ok. --drepper@gnu */
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41 char buf[128];
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42 int len = 0;
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43 int c;
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44
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45 while ((c = getchar ()) != EOF && c != '\n')
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46 if ((len > 0 && len < 127) || (len == 0 && !isspace (c)))
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47 buf[len++] = c;
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48 buf[len] = '\0';
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49
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50 return rpmatch (buf) == 1;
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51 }