87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
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/* -*- C -*-
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* Copyright (c) 1998-2006 Motoyuki Kasahara
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#include <string.h>
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#define YESNO_RESPONSE_SIZE 80
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/*
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* Get y/n response to `message'.
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* If `y' is selected, 1 is returned. Otherwise 0 is returned.
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*/
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int
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query_y_or_n(const char *message)
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{
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char response[YESNO_RESPONSE_SIZE];
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char *head, *tail;
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for (;;) {
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/*
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* Output `message' to standard error.
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*/
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fputs(message, stderr);
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fflush(stderr);
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/*
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* Get a line from standard in.
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*/
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if (fgets(response, YESNO_RESPONSE_SIZE, stdin) == NULL)
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return 0;
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if (strchr(response, '\n') == NULL)
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continue;
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/*
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* Delete spaces and tabs in the beginning and end of the
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* line.
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*/
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for (head = response; *head == ' ' || *head == '\t'; head++)
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;
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for (tail = head + strlen(head) - 1;
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head <= tail && (*tail == ' ' || *tail == '\t' || *tail == '\n');
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tail--)
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*tail = '\0';
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/*
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* Return if the line is `y' or `n'.
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*/
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if ((*head == 'Y' || *head == 'y') && *(head + 1) == '\0')
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return 1;
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if ((*head == 'N' || *head == 'n') && *(head + 1) == '\0')
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return 0;
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}
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/* not reached */
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return 0;
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}
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