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60 lines
2.9 KiB
C
60 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 2021 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 "libc/calls/struct/metatermios.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/errno.h"
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#include "libc/log/internal.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/termios.h"
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/**
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* @fileoverview Terminal Restoration Helper for System Five.
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*
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* This is used by the crash reporting functions, e.g. __die(), to help
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* ensure the terminal is in an unborked state after a crash happens.
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*/
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#define RESET_COLOR "\e[0m"
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#define SHOW_CURSOR "\e[?25h"
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#define DISABLE_MOUSE "\e[?1000;1002;1015;1006l"
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#define ANSI_RESTORE RESET_COLOR SHOW_CURSOR DISABLE_MOUSE
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static bool __isrestorable;
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static union metatermios __oldtermios;
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// called weakly by libc/calls/ioctl_tcsets.c to avoid pledge("tty")
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void __on_ioctl_tcsets(void) {
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int e;
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e = errno;
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if (sys_ioctl(0, TCGETS, &__oldtermios) != -1) {
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__isrestorable = true;
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}
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errno = e;
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}
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void __restore_tty(void) {
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int e;
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if (__isrestorable && !__isworker && !__nocolor) {
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e = errno;
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sys_write(0, ANSI_RESTORE, __strlen(ANSI_RESTORE));
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sys_ioctl(0, TCSETSF, &__oldtermios);
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errno = e;
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}
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}
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