text: /*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
  │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
  ╞══════════════════════════════════════════════════════════════════════════════╡
  │ Copyright 2020 Justine Alexandra Roberts Tunney                              │
  │                                                                              │
  │ Permission to use, copy, modify, and/or distribute this software for         │
  │ any purpose with or without fee is hereby granted, provided that the         │
  │ above copyright notice and this permission notice appear in all copies.      │
  │                                                                              │
  │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
  │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
  │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
  │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
  │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
  │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
  │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
  │ PERFORMANCE OF THIS SOFTWARE.                                                │
  ╚─────────────────────────────────────────────────────────────────────────────*/
  #include "libc/log/color.internal.h"
  #include "libc/log/internal.h"
  #include "libc/log/libfatal.internal.h"
  #include "libc/runtime/runtime.h"
  
  /**
   * Prints initial part of fatal message.
   *
   * @note this is support code for __check_fail(), __assert_fail(), etc.
   * @see __start_fatal_ndebug()
   */
  relegated void __start_fatal(const char *file, int line) {
    bool colorful;
    char s[16 + 16 + 16 + 16 + PATH_MAX + 16 + NAME_MAX + 16], *p = s;
    __restore_tty(1);
    colorful = cancolor();
    *p++ = '\r';
    if (colorful) p = __stpcpy(p, "\e[J\e[30;101m");
    p = __stpcpy(p, "error");
    if (colorful) p = __stpcpy(p, "\e[94;49m"), *p++ = ':';
    p = __stpcpy(p, file), *p++ = ':';
    p = __intcpy(p, line), *p++ = ':';
    p = __stpcpy(p, program_invocation_short_name);
    if (colorful) p = __stpcpy(p, "\e[0m");
    *p++ = ':';
    *p++ = ' ';
    __write(s, p - s);
  }
  