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/* This file is part of Eclat.
Copyright (C) 2012 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 <termios.h>
#include <signal.h>
#include <sysexits.h>
#include <errno.h>
#include <string.h>
void
eclat_trimnl(char *s)
{
size_t len = strlen(s);
while (len > 0 && s[len-1] == '\n')
--len;
s[len] = 0;
}
#ifndef TCSASOFT
# define TCSASOFT 0
#endif
char *
eclat_getans(char *prompt, char *dfl, int pass)
{
char *buf = NULL;
size_t size = 0;
struct termios t, tsave;
int rc;
int fd = fileno(stdin);
sigset_t oldset;
fprintf(stdout, "%s", prompt);
if (dfl)
fprintf(stdout, " [%s]", dfl);
fprintf(stdout, ": ");
fflush(stdout);
if (pass) {
sigset_t set;
static int signum[] = {
SIGHUP, SIGINT, SIGQUIT, SIGABRT, SIGPIPE,
SIGALRM, SIGTERM
};
int i;
if (tcgetattr(fd, &t))
die(EX_SOFTWARE, "cannot query console attributes: %s",
strerror(errno));
tsave = t;
t.c_lflag &= ~(ECHO | ISIG);
if (tcsetattr(fd, TCSAFLUSH | TCSASOFT, &t))
die(EX_SOFTWARE, "cannot turn echo off; %s",
strerror(errno));
sigemptyset(&set);
for (i = 0; i < sizeof(signum)/sizeof(signum[0]); i++)
sigaddset(&set, signum[i]);
sigprocmask(SIG_BLOCK, &set, &oldset);
}
rc = grecs_getline(&buf, &size, stdin);
if (pass) {
if (tcsetattr(fd, TCSAFLUSH | TCSASOFT, &tsave))
die(EX_SOFTWARE, "failed to restore echo state: %s",
strerror(errno));
sigprocmask(SIG_SETMASK, &oldset, NULL);
}
if (rc <= 0) {
free(buf);
return NULL;
}
eclat_trimnl(buf);
if (buf[0] == 0 && dfl) {
free(buf);
buf = grecs_strdup(dfl);
}
return buf;
}
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