/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2024 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 <errno.h>
#include <limits.h>
#include <stdlib.h>

#define TEST(x) \
  if (!(x))     \
  return __LINE__

int main() {
  TEST(atoi("") == 0);
  TEST(atoi("-") == 0);
  TEST(atoi("0") == 0);
  TEST(atoi("1") == 1);
  TEST(atoi("+1") == 1);
  TEST(atoi("-1") == -1);
  TEST(atoi("1-") == 1);
  TEST(atoi("--1") == 0);
  TEST(atoi("16 32") == 16);
  TEST(atoi("\t 16") == 16);
  TEST(atoi("\v 16") == 16);
  TEST(atoi("\n 16") == 16);
  TEST(atoi("\r 16") == 16);
  TEST(atoi("rr 16") == 0);
  TEST(atoi("0123456789") == 123456789);
  TEST(atoi("2147483647") == INT_MAX);
  TEST(atoi("-2147483648") == INT_MIN);
  TEST(atoi("-2147483647") == INT_MIN + 1);
  TEST(!errno);
}