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https://github.com/jart/cosmopolitan.git
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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
102 lines
4.1 KiB
C
102 lines
4.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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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/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/pollfd.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/poll.h"
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#include "libc/sysv/errfuns.h"
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/* TODO(jart): DELETE */
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static int ttyident_probe(struct TtyIdent *ti, int ttyinfd, int ttyoutfd,
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const char *msg) {
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ssize_t rc;
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size_t got;
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char buf[64];
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int id, version;
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if ((rc = write(ttyoutfd, msg, strlen(msg))) != -1) {
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TryAgain:
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if ((rc = read(ttyinfd, buf, sizeof(buf))) != -1) {
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buf[min((got = (size_t)rc), sizeof(buf) - 1)] = '\0';
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if (sscanf(buf, "\e[>%d;%d", &id, &version) >= 1) {
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ti->id = id;
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ti->version = version;
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rc = 0;
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} else {
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rc = eio();
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}
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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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if (poll((struct pollfd[]){{ttyinfd, POLLIN}}, 1, 100) != 0) {
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goto TryAgain;
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} else {
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rc = etimedout();
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}
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}
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}
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return rc;
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}
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/**
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* Identifies teletypewriter.
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*
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* For example, we can tell if process is running in a GNU Screen
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* session Gnome Terminal.
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*
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* @return object if TTY responds, or NULL w/ errno
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* @see ttyidentclear()
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*/
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int ttyident(struct TtyIdent *ti, int ttyinfd, int ttyoutfd) {
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int rc;
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struct termios old;
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struct TtyIdent outer;
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rc = -1;
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if (!IsWindows()) {
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if (ttyconfig(ttyinfd, ttysetrawdeadline, 3, &old) != -1) {
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if (ttyident_probe(ti, ttyinfd, ttyoutfd, "\e[>c") != -1) {
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rc = 0;
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memset(&outer, 0, sizeof(outer));
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if (ti->id == 83 /* GNU Screen */ && (ti->next || _weaken(malloc)) &&
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ttyident_probe(&outer, ttyinfd, ttyoutfd, "\eP\e[>c\e\\") != -1 &&
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(ti->next =
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(ti->next ? ti->next
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: _weaken(malloc)(sizeof(struct TtyIdent))))) {
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memcpy(ti->next, &outer, sizeof(outer));
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} else {
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free(ti->next);
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ti->next = 0;
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}
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}
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ttyrestore(ttyinfd, &old);
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}
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}
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return rc;
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}
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