Remove 'gshadow' and merge into 'nss'

The majority of gshadow routines are entry points for nss functionality.
This commit removes the 'gshadow' subdirectory and moves all
functionality and tests to 'nss'.  References to gshadow/ are
accordingly changed.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 192 insertions, 0 deletions

diff --git a/nss/tst-fgetsgent_r.c b/nss/tst-fgetsgent_r.c
new file mode 100644
index 0000000..17558fa
--- /dev/null
+++ b/nss/tst-fgetsgent_r.c
@@ -0,0 +1,192 @@
+/* Test for fgetsgent_r and buffer sizes.
+   Copyright (C) 2020-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <array_length.h>
+#include <errno.h>
+#include <gshadow.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/support.h>
+#include <support/temp_file.h>
+#include <support/xmemstream.h>
+#include <support/xstdio.h>
+
+/* Turn a parsed struct back into a line string.  The returned string
+   should be freed.  */
+static char *
+format_ent (const struct sgrp *e)
+{
+  struct xmemstream stream;
+  xopen_memstream (&stream);
+  TEST_COMPARE (putsgent (e, stream.out), 0);
+  xfclose_memstream (&stream);
+  return stream.buffer;
+}
+
+/* An entry in the input file along with the expected output.  */
+struct input
+{
+  const char *line;		/* Line in the file.  */
+  const char *expected;		/* Expected output.  NULL if skipped.  */
+};
+
+const struct input inputs[] =
+  {
+   /* Regular entries.  */
+   { "g1:x1::\n", "g1:x1::\n" },
+   { "g2:x2:a1:\n", "g2:x2:a1:\n" },
+   { "g3:x3:a2:u1\n", "g3:x3:a2:u1\n" },
+   { "g4:x4:a3,a4:u2,u3,u4\n", "g4:x4:a3,a4:u2,u3,u4\n" },
+
+   /* Comments and empty lines.  */
+   { "\n", NULL },
+   { " \n", NULL },
+   { "\t\n", NULL },
+   { "#g:x::\n", NULL },
+   { " #g:x::\n", NULL },
+   { "\t#g:x::\n", NULL },
+   { " \t#g:x::\n", NULL },
+
+   /* Marker for synchronization.  */
+   { "g5:x5::\n", "g5:x5::\n" },
+
+   /* Leading whitespace.  */
+   { " g6:x6::\n", "g6:x6::\n" },
+   { "\tg7:x7::\n", "g7:x7::\n" },
+
+   /* This is expected to trigger buffer exhaustion during parsing
+      (bug 20338).  */
+   {
+    "g8:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:u5,u6,u7,u8,u9:\n",
+    "g8:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:u5,u6,u7,u8,u9:\n",
+   },
+   {
+    "g9:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx::a5,a6,a7,a8,a9,a10\n",
+    "g9:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx::a5,a6,a7,a8,a9,a10\n",
+   },
+  };
+
+/* Writes the test data to a temporary file and returns its name.  The
+   returned pointer should be freed.  */
+static char *
+create_test_file (void)
+{
+  char *path;
+  int fd = create_temp_file ("tst-fgetsgent_r-", &path);
+  FILE *fp = fdopen (fd, "w");
+  TEST_VERIFY_EXIT (fp != NULL);
+
+  for (size_t i = 0; i < array_length (inputs); ++i)
+    fputs (inputs[i].line, fp);
+
+  xfclose (fp);
+  return path;
+}
+
+/* Read the test file with the indicated start buffer size.  Return
+   true if the buffer size had to be increased during reading.  */
+static bool
+run_test (const char *path, size_t buffer_size)
+{
+  bool resized = false;
+  FILE *fp = xfopen (path, "r");
+
+  /* This avoids repeated lseek system calls (bug 26257).  */
+  TEST_COMPARE (fseeko64 (fp, 0, SEEK_SET), 0);
+
+  size_t i = 0;
+  while (true)
+    {
+      /* Skip over unused expected entries.  */
+      while (i < array_length (inputs) && inputs[i].expected == NULL)
+	++i;
+
+      /* Store the data on the heap, to help valgrind to detect
+	 invalid accesses.  */
+      struct sgrp *result_storage = xmalloc (sizeof (*result_storage));
+      char *buffer = xmalloc (buffer_size);
+      struct sgrp **result_pointer_storage
+	= xmalloc (sizeof (*result_pointer_storage));
+
+      int ret = fgetsgent_r (fp, result_storage, buffer, buffer_size,
+			     result_pointer_storage);
+      if (ret == 0)
+	{
+	  TEST_VERIFY (*result_pointer_storage != NULL);
+	  TEST_VERIFY (i < array_length (inputs));
+	  if (*result_pointer_storage != NULL
+	      && i < array_length (inputs))
+	    {
+	      char * actual = format_ent (*result_pointer_storage);
+	      TEST_COMPARE_STRING (inputs[i].expected, actual);
+	      free (actual);
+	      ++i;
+	    }
+	  else
+	    break;
+	}
+      else
+	{
+	  TEST_VERIFY (*result_pointer_storage == NULL);
+	  TEST_COMPARE (ret, errno);
+
+	  if (ret == ENOENT)
+	    {
+	      TEST_COMPARE (i, array_length (inputs));
+	      free (result_pointer_storage);
+	      free (buffer);
+	      free (result_storage);
+	      break;
+	    }
+	  else if (ret == ERANGE)
+	    {
+	      resized = true;
+	      ++buffer_size;
+	    }
+	  else
+	    FAIL_EXIT1 ("read failure: %m");
+	}
+
+      free (result_pointer_storage);
+      free (buffer);
+      free (result_storage);
+    }
+
+  xfclose (fp);
+  return resized;
+}
+
+static int
+do_test (void)
+{
+  char *path = create_test_file ();
+
+  for (size_t buffer_size = 3; ; ++buffer_size)
+    {
+      bool resized = run_test (path, buffer_size);
+      if (!resized)
+	break;
+    }
+
+  free (path);
+
+  return 0;
+}
+
+#include <support/test-driver.c>