utils.c

/*
 * Copyright (c) 2017 Jose M. Dana
 *
 * This file is part of gadget_snapshots.
 * http://github.com/jmdana/gadget_snapshots
 *
 * gadget_snapshots 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 (version 3 of the License only).
 *
 * gadget_snapshots 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 gadget_snapshots. If not, see <http://www.gnu.org/licenses/>.
 */


#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <termios.h>

int same_file(char *src, char *dst) {
    struct stat s1;
    struct stat s2;
    int f1;
    int f2;

    f1 = open(src, O_RDONLY);
    f2 = open(dst, O_RDONLY);

    fstat(f1, &s1);
    fstat(f2, &s2);

    close(f1);
    close(f2);

    return s1.st_ino == s2.st_ino && s1.st_dev == s2.st_dev;
}


int getonechar() {
    int c;
    static struct termios oldt, newt;

    /*tcgetattr gets the parameters of the current terminal
    STDIN_FILENO will tell tcgetattr that it should write the settings
    of stdin to oldt*/
    tcgetattr(STDIN_FILENO, &oldt);

    newt = oldt;

    /*ICANON normally takes care that one line at a time will be processed
    that means it will return if it sees a "\n" or an EOF or an EOL*/
    newt.c_lflag &= ~(ICANON);

    /*Those new settings will be set to STDIN
    TCSANOW tells tcsetattr to change attributes immediately. */
    tcsetattr(STDIN_FILENO, TCSANOW, &newt);

    c = getchar();

    /*restore the old settings*/
    tcsetattr(STDIN_FILENO, TCSANOW, &oldt);

    return c;
}