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annotate lib/yesno.c @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
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1 /* yesno.c -- read a yes/no response from stdin
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3 Copyright (C) 1990, 1998, 2001, 2003-2019 Free Software Foundation, Inc.
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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17
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18 #include <config.h>
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19
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20 #include "yesno.h"
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21
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22 #include <stdlib.h>
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23 #include <stdio.h>
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24
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25 /* Return true if we read an affirmative line from standard input.
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26
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27 Since this function uses stdin, it is suggested that the caller not
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28 use STDIN_FILENO directly, and also that the line
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29 atexit(close_stdin) be added to main(). */
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31 bool
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32 yesno (void)
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33 {
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34 bool yes;
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36 #if ENABLE_NLS
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37 char *response = NULL;
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38 size_t response_size = 0;
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39 ssize_t response_len = getline (&response, &response_size, stdin);
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40
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41 if (response_len <= 0)
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42 yes = false;
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43 else
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44 {
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45 /* Remove EOL if present as that's not part of the matched response,
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46 and not matched by $ for example. */
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47 if (response[response_len - 1] == '\n')
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48 response[response_len - 1] = '\0';
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49 yes = (0 < rpmatch (response));
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50 }
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51
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52 free (response);
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53 #else
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54 /* Test against "^[yY]", hardcoded to avoid requiring getline,
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55 regex, and rpmatch. */
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56 int c = getchar ();
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57 yes = (c == 'y' || c == 'Y');
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58 while (c != '\n' && c != EOF)
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59 c = getchar ();
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60 #endif
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61
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62 return yes;
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63 }