/*-*- 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 2023 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/runtime/runtime.h"
#include "libc/runtime/sysconf.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/prot.h"
#include "libc/testlib/testlib.h"

TEST(memchr, test) {
  const char *s = "hello";
  ASSERT_EQ(s + 1, memchr(s, 'e', 5));
}

TEST(memchr, pageOverlapTorture) {
  long pagesz = sysconf(_SC_PAGESIZE);
  char *map = mmap(0, pagesz * 2, PROT_READ | PROT_WRITE,
                   MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
  ASSERT_SYS(0, 0, mprotect(map + pagesz, pagesz, PROT_NONE));
  strcpy(map + pagesz - 9, "12345678");
  EXPECT_EQ(map + pagesz - 1, memchr(map + pagesz - 9, 0, 79));
  EXPECT_SYS(0, 0, munmap(map, pagesz * 2));
}