/*-
* Copyright (c) 2013 Izumi Tsutsui. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
static void
print_countdown(const char *pfmt, int n)
{
int len, i;
char fmtbuf[FMTLEN];
len = snprintf(fmtbuf, FMTLEN, pfmt, n);
printf("%s", fmtbuf);
for (i = 0; i < len; i++)
putchar('\b');
}
/*
* awaitkey(const char *pfmt, int timeout, bool tell)
*
* Wait timeout seconds until any input from stdin.
* print countdown message using "pfmt" if tell is true.
* Requires tgetchar(), which returns 0 if there is no input.
*/
char
awaitkey(const char *pfmt, int timeout, bool tell)
{
uint32_t otick;
char c = 0;
if (timeout <= 0)
goto out;
if (tell)
print_countdown(pfmt, timeout);
otick = tick;
for (;;) {
c = tgetchar();
if (c != 0)
break;
if (tick - otick >= hz) {
otick = tick;
if (--timeout == 0)
break;
if (tell)
print_countdown(pfmt, timeout);
}
}
