From f8505690e3eb9e87d457f00e49b51e52241675be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C5=8Dshin?= <git@wholezero.org>
Date: Mon, 4 Dec 2023 12:18:08 -0500
Subject: [PATCH] Test cases for GetProgramExecutableName()

---
 .../calls/getprogramexecutablename_test.c     | 107 ++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 test/libc/calls/getprogramexecutablename_test.c

diff --git a/test/libc/calls/getprogramexecutablename_test.c b/test/libc/calls/getprogramexecutablename_test.c
new file mode 100644
index 000000000..6d37e1049
--- /dev/null
+++ b/test/libc/calls/getprogramexecutablename_test.c
@@ -0,0 +1,107 @@
+/*-*- 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/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/subprocess.h"
+#include "libc/testlib/testlib.h"
+
+static char *self;
+static bool skipexectests;
+
+void SetUp(void) {
+  self = GetProgramExecutableName();
+}
+
+void SetUpOnce(void) {
+  if (!getenv("COSMOPOLITAN_PROGRAM_EXECUTABLE")) {
+    fprintf(stderr,
+            "warning: old ape loader detected; skipping some tests %m\n");
+    skipexectests = true;
+  }
+  testlib_enable_tmp_setup_teardown();
+}
+
+__attribute__((__constructor__)) static void Child(int argc, char *argv[]) {
+  if (argc >= 2 && !strcmp(argv[1], "Child")) {
+    ASSERT_EQ(3, argc);
+    EXPECT_STREQ(argv[2], GetProgramExecutableName());
+    exit(0);
+  }
+}
+
+TEST(GetProgramExecutableName, ofThisFile) {
+  EXPECT_EQ('/', *self);
+  EXPECT_TRUE(
+    endswith(self, "test/libc/calls/getprogramexecutablename_test.com"));
+}
+
+TEST(GetProgramExecutableName, nullEnv) {
+  if (skipexectests) return;
+  SPAWN(fork);
+  execve(self, (char *[]){self, "Child", self, 0}, (char *[]){ 0 });
+  EXITS(0);
+}
+
+TEST(GetProramExecutableName, weirdArgv0NullEnv) {
+  if (skipexectests) return;
+  SPAWN(fork);
+  execve(self, (char *[]){"hello", "Child", self, 0}, (char *[]){ 0 });
+  EXITS(0);
+}
+
+TEST(GetProgramExecutableName, weirdArgv0CosmoVar) {
+  if (skipexectests) return;
+  char buf[32 + PATH_MAX];
+  stpcpy(stpcpy(buf, "COSMOPOLITAN_PROGRAM_EXECUTABLE="), self);
+  SPAWN(fork);
+  execve(self, (char *[]){"hello", "Child", self, 0}, (char *[]){ buf, 0});
+  EXITS(0);
+}
+
+TEST(GetProgramExecutableName, weirdArgv0WrongCosmoVar) {
+  if (skipexectests) return;
+  char *bad = "COSMOPOLITAN_PROGRAM_EXECUTABLE=hi";
+  SPAWN(fork);
+  execve(self, (char *[]){"hello", "Child", self, 0}, (char *[]){ bad, 0});
+  EXITS(0);
+}
+
+TEST(GetProgramExecutableName, MovedSelf) {
+  if (skipexectests) return;
+  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, 0}, (char *[]){ 0 });
+  EXITS(0);
+}