[hackers] [scroll] check explicit for return of -1 || Jan Klemkow

[git]

commit 6612bc96e47e1db1199a4d1b657dd10eb4cd438e
Author:     Jan Klemkow <j.klem...@wemelug.de>
AuthorDate: Mon Apr 20 23:01:21 2020 +0200
Commit:     Jan Klemkow <j.klem...@wemelug.de>
CommitDate: Mon Apr 20 23:01:21 2020 +0200

    check explicit for return of -1

diff --git a/scroll.c b/scroll.c
index 14fb287..22e2970 100644
--- a/scroll.c
+++ b/scroll.c
@@ -223,11 +223,11 @@ getcursorposition(int *x, int *y)
        char input[BUFSIZ];
        ssize_t n;
 
-       if (write(STDOUT_FILENO, "\033[6n", 4) < 0)
+       if (write(STDOUT_FILENO, "\033[6n", 4) == -1)
                die("requesting cursor position");
 
        do {
-               if ((n = read(STDIN_FILENO, input, sizeof(input)-1)) < 0)
+               if ((n = read(STDIN_FILENO, input, sizeof(input)-1)) == -1)
                        die("reading cursor position");
                input[n] = '\0';
        } while (sscanf(input, "\033[%d;%dR", x, y) != 2);
@@ -415,7 +415,7 @@ main(int argc, char *argv[])
                die("atexit:");
 
        /* get window size of the terminal */
-       if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0)
+       if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1)
                die("ioctl:");
 
        if (signal(SIGWINCH, sigwinch) == SIG_ERR)