/*-*- 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 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/calls/calls.h"
#include "libc/dce.h"
#include "libc/limits.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/o.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/subprocess.h"
#include "libc/testlib/testlib.h"

static char *self;

void SetUpOnce(void) {
  self = GetProgramExecutableName();
  testlib_enable_tmp_setup_teardown();
}

__attribute__((__constructor__)) static void Child(int argc, char *argv[]) {
  static bool skiparg0tests;
  if (!IsXnuSilicon()) {
    /* TODO(mrdomino): these tests only pass on XnuSilicon right now because
                       __sys_execve fails there, so the ape loader is used.
                       the correct check here is "we have been invoked either
                       as an assimilated binary or via the ape loader, and not
                       via a raw __sys_execve." */
    skiparg0tests = true;
    if (argc < 2) {
      fprintf(stderr, "warning: skipping argv[0] tests\n");
    }
  }
  if (argc >= 2 && !strcmp(argv[1], "Child")) {
    ASSERT_EQ(argc, 4);
    EXPECT_STREQ(argv[2], GetProgramExecutableName());
    if (!skiparg0tests) {
      EXPECT_STREQ(argv[3], argv[0]);
    }
    exit(g_testlib_failed);
  }
}

TEST(GetProgramExecutableName, ofThisFile) {
  EXPECT_EQ('/', *self);
  EXPECT_TRUE(
      endswith(self, "test/libc/calls/getprogramexecutablename_test.com"));
}

TEST(GetProgramExecutableName, nullEnv) {
  SPAWN(fork);
  execve(self, (char *[]){self, "Child", self, self, 0}, (char *[]){0});
  abort();
  EXITS(0);
}

TEST(GetProramExecutableName, weirdArgv0NullEnv) {
  SPAWN(fork);
  execve(self, (char *[]){"hello", "Child", self, "hello", 0}, (char *[]){0});
  abort();
  EXITS(0);
}

TEST(GetProgramExecutableName, weirdArgv0CosmoVar) {
  char buf[32 + PATH_MAX];
  stpcpy(stpcpy(buf, "COSMOPOLITAN_PROGRAM_EXECUTABLE="), self);
  SPAWN(fork);
  execve(self, (char *[]){"hello", "Child", self, "hello", 0},
         (char *[]){buf, 0});
  abort();
  EXITS(0);
}

TEST(GetProgramExecutableName, weirdArgv0WrongCosmoVar) {
  char *bad = "COSMOPOLITAN_PROGRAM_EXECUTABLE=hi";
  SPAWN(fork);
  execve(self, (char *[]){"hello", "Child", self, "hello", 0},
         (char *[]){bad, 0});
  abort();
  EXITS(0);
}

TEST(GetProgramExecutableName, movedSelf) {
  char buf[BUFSIZ];
  ASSERT_SYS(0, 3, open(GetProgramExecutableName(), O_RDONLY));
  ASSERT_SYS(0, 4, creat("test", 0755));
  ssize_t rc;
  while ((rc = read(3, buf, BUFSIZ)) > 0) {
    ASSERT_SYS(0, rc, write(4, buf, rc));
  }
  ASSERT_EQ(0, rc);
  ASSERT_SYS(0, 0, close(4));
  ASSERT_SYS(0, 0, close(3));
  ASSERT_NE(NULL, getcwd(buf, BUFSIZ - 5));
  stpcpy(buf + strlen(buf), "/test");
  SPAWN(fork);
  execve(buf, (char *[]){"hello", "Child", buf, "hello", 0}, (char *[]){0});
  abort();
  EXITS(0);
}