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/* This file is part of Eclat.
Copyright (C) 2012-2015 Sergey Poznyakoff.
Eclat is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Eclat is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Eclat. If not, see <http://www.gnu.org/licenses/>. */
#include "libeclat.h"
#include <stdio.h>
#include <sysexits.h>
int
eclat_vgetyn(int dfl, const char *prompt, va_list ap)
{
static char *hint[] = { "y/n", "y/N", "Y/n" };
int state = 0;
int c, resp;
if (dfl < -1)
dfl = -1;
else if (dfl > 1)
dfl = 1;
do {
switch (state) {
case 1:
if (c == ' ' || c == '\t')
continue;
resp = c;
state = 2;
/* fall through */
case 2:
if (c == '\n') {
switch (resp) {
case 'y':
case 'Y':
return 1;
case 'n':
case 'N':
return 0;
case '\n':
if (dfl >= 0)
return dfl;
/* fall through */
default:
err("Please, reply 'y' or 'n'");
}
state = 0;
} else
break;
case 0:
vfprintf(stdout, prompt, ap);
fprintf(stdout, " [%s] ", hint[dfl+1]);
fflush(stdout);
state = 1;
break;
}
} while ((c = getchar()) != EOF);
exit(EX_USAGE);
}
int
eclat_getyn(int dfl, const char *prompt, ...)
{
va_list ap;
int rc;
va_start(ap, prompt);
rc = eclat_vgetyn(dfl, prompt, ap);
va_end(ap);
return rc;
}
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