[hackers] [lchat] lchat: flush earlier to make sure the initial prompt is displayed || Tom Schwindl

[git]

commit 7effd7e7013dd385bf4cd6d4fbaea28475ab4886
Author:     Tom Schwindl <schwi...@posteo.de>
AuthorDate: Mon Aug 22 22:28:37 2022 +0200
Commit:     Jan Klemkow <j.klem...@wemelug.de>
CommitDate: Tue Sep 20 17:12:45 2022 +0200

    lchat: flush earlier to make sure the initial prompt is displayed
    
    The first fflush(3) occurs when the first character is read. In case we
    need to wait a bit longer for this to happen, the initial prompt isn't
    printed immediately and the program looks like it hung up.

diff --git a/lchat.c b/lchat.c
index d96d30e..3d820c2 100644
--- a/lchat.c
+++ b/lchat.c
@@ -335,6 +335,9 @@ main(int argc, char *argv[])
        fputs(prompt, stdout);
 
        for (;;) {
+               if (fflush(stdout) == EOF)
+                       err(EXIT_FAILURE, "fflush");
+
                errno = 0;
                if (poll(pfd, nfds, INFTIM) == -1 && errno != EINTR)
                        err(EXIT_FAILURE, "poll");
@@ -445,9 +448,6 @@ main(int argc, char *argv[])
                        if (sl->rcur + prompt_len > 0)
                                printf("\033[%zuC", sl->rcur + prompt_len);
                }
-
-               if (fflush(stdout) == EOF)
-                       err(EXIT_FAILURE, "fflush");
        }
        return EXIT_SUCCESS;
 }