busybox/libbb/ask_confirmation.c

/* vi: set sw=4 ts=4: */
/*
 * bb_ask_confirmation implementation for busybox
 *
 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* Read a line from stdin.  If the first non-whitespace char is 'y' or 'Y',
 * return 1.  Otherwise return 0.
 */

#include <stdio.h>
#include <ctype.h>
#include "libbb.h"

int bb_ask_confirmation(void)
{
	int retval = 0;
	int first = 1;
	int c;

	while (((c = getchar()) != EOF) && (c != '\n')) {
		/* Make sure we get the actual function call for isspace,
		 * as speed is not critical here. */
		if (first && !(isspace)(c)) {
			--first;
			if ((c == 'y') || (c == 'Y')) {
				++retval;
			}
		}
	}

	return retval;
}