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https://github.com/jart/cosmopolitan.git
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9e3e985ae5
Here's some screenshots of an emulator tui program that was compiled on Linux, then scp'd it to Windows, Mac, and FreeBSD. https://justine.storage.googleapis.com/blinkenlights-cmdexe.png https://justine.storage.googleapis.com/blinkenlights-imac.png https://justine.storage.googleapis.com/blinkenlights-freebsd.png https://justine.storage.googleapis.com/blinkenlights-lisp.png How is this even possible that we have a nontrivial ui binary that just works on Mac, Windows, Linux, and BSD? Surely a first ever achievement. Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in emulator for fun and profit.
61 lines
2.9 KiB
C
61 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "dsp/tty/tty.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/termios.h"
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#include "libc/errno.h"
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#include "libc/sock/sock.h"
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#include "libc/sysv/consts/poll.h"
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#include "libc/sysv/consts/termios.h"
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/* TODO(jart): DELETE */
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/**
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* Sends data to teletypewriter the pain-free way.
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*
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* This function blocks forever until the full amount is transmitted,
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* regardless of whether or not the character device is in non-blocking
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* mode, regardless of whether or not it's interrupted by a signal. It
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* can still be escaped by longjmp'ing out of a signal handler.
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*
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* @return 0 on success, or -1 w/ errno
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*/
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ssize_t ttywrite(int fd, const void *data, size_t size) {
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char *p;
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ssize_t rc;
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size_t wrote, n;
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p = data;
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n = size;
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do {
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TryAgain:
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if ((rc = write(fd, p, n)) != -1) {
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wrote = rc;
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p += wrote;
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n -= wrote;
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} else if (errno == EINTR) {
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goto TryAgain;
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} else if (errno == EAGAIN) {
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poll((struct pollfd[]){{fd, POLLOUT}}, 1, -1);
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} else {
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return -1;
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}
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} while (n);
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return 0;
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}
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