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-rw-r--r--tests/test-supersede-fopen.h269
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diff --git a/tests/test-supersede-fopen.h b/tests/test-supersede-fopen.h
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+++ b/tests/test-supersede-fopen.h
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+/* Tests for opening a file without destroying an old file with the same name.
+
+ Copyright (C) 2020-2024 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible, 2020. */
+
+static void
+test_fopen_supersede (bool supersede_if_exists, bool supersede_if_does_not_exist)
+{
+ char xtemplate[] = "gnulibtestXXXXXX";
+ char *dir = mkdtemp (xtemplate);
+ char *filename = file_name_concat (dir, "test.mo", NULL);
+ struct stat statbuf;
+
+ /* Test the case that the file does not yet exist. */
+ {
+ ASSERT (stat (filename, &statbuf) < 0);
+
+ struct supersede_final_action action;
+ FILE *fp =
+ fopen_supersede (filename, "wb",
+ supersede_if_exists, supersede_if_does_not_exist,
+ &action);
+ ASSERT (fp != NULL);
+ ASSERT (fwrite ("Hello world\n", 1, 12, fp) == 12 && fflush (fp) == 0);
+ if (supersede_if_does_not_exist)
+ ASSERT (stat (filename, &statbuf) < 0);
+ else
+ ASSERT (stat (filename, &statbuf) == 0);
+ ASSERT (fclose_supersede (fp, &action) == 0);
+
+ ASSERT (stat (filename, &statbuf) == 0);
+
+ size_t file_size;
+ char *file_contents = read_file (filename, RF_BINARY, &file_size);
+ ASSERT (file_size == 12);
+ ASSERT (memcmp (file_contents, "Hello world\n", 12) == 0);
+ }
+
+ /* Test the case that the file exists and is a regular file. */
+ {
+ ASSERT (stat (filename, &statbuf) == 0);
+ dev_t orig_dev = statbuf.st_dev;
+ ino_t orig_ino = statbuf.st_ino;
+
+ struct supersede_final_action action;
+ FILE *fp =
+ fopen_supersede (filename, "wb",
+ supersede_if_exists, supersede_if_does_not_exist,
+ &action);
+ ASSERT (fp != NULL);
+ ASSERT (fwrite ("Foobar\n", 1, 7, fp) == 7 && fflush (fp) == 0);
+ ASSERT (stat (filename, &statbuf) == 0);
+ {
+ size_t file_size;
+ char *file_contents = read_file (filename, RF_BINARY, &file_size);
+ if (supersede_if_exists)
+ {
+ ASSERT (file_size == 12);
+ ASSERT (memcmp (file_contents, "Hello world\n", 12) == 0);
+ }
+ else
+ {
+ ASSERT (file_size == 7);
+ ASSERT (memcmp (file_contents, "Foobar\n", 7) == 0);
+ }
+ }
+ ASSERT (fclose_supersede (fp, &action) == 0);
+
+ ASSERT (stat (filename, &statbuf) == 0);
+
+ size_t file_size;
+ char *file_contents = read_file (filename, RF_BINARY, &file_size);
+ ASSERT (file_size == 7);
+ ASSERT (memcmp (file_contents, "Foobar\n", 7) == 0);
+
+ if (supersede_if_exists)
+ {
+ /* Verify that the file now has a different inode number, on the same
+ device. */
+#if !(defined _WIN32 && !defined __CYGWIN__)
+ /* Note: On Linux/mips, statbuf.st_dev is smaller than a dev_t! */
+ dev_t new_dev = statbuf.st_dev;
+ ASSERT (memcmp (&orig_dev, &new_dev, sizeof (dev_t)) == 0);
+ ASSERT (memcmp (&orig_ino, &statbuf.st_ino, sizeof (ino_t)) != 0);
+#endif
+ }
+ }
+
+ /* Test the case that the file exists and is a character device. */
+ {
+ ASSERT (stat (DEV_NULL, &statbuf) == 0);
+
+ struct supersede_final_action action;
+ FILE *fp =
+ fopen_supersede (DEV_NULL, "wb",
+ supersede_if_exists, supersede_if_does_not_exist,
+ &action);
+ ASSERT (fp != NULL);
+ ASSERT (fwrite ("Foobar\n", 1, 7, fp) == 7 && fflush (fp) == 0);
+ ASSERT (stat (DEV_NULL, &statbuf) == 0);
+ ASSERT (fclose_supersede (fp, &action) == 0);
+
+ ASSERT (stat (DEV_NULL, &statbuf) == 0);
+ }
+
+ /* Test the case that the file is a symbolic link to an existing regular
+ file. */
+ {
+ const char *linkname = "link1";
+ unlink (linkname);
+ if (symlink (filename, linkname) >= 0)
+ {
+ ASSERT (stat (linkname, &statbuf) == 0);
+ dev_t orig_dev = statbuf.st_dev;
+ ino_t orig_ino = statbuf.st_ino;
+
+ struct supersede_final_action action;
+ FILE *fp =
+ fopen_supersede (linkname, "wb",
+ supersede_if_exists, supersede_if_does_not_exist,
+ &action);
+ ASSERT (fp != NULL);
+ ASSERT (fwrite ("New\n", 1, 4, fp) == 4 && fflush (fp) == 0);
+ ASSERT (stat (linkname, &statbuf) == 0);
+ {
+ size_t file_size;
+ char *file_contents = read_file (linkname, RF_BINARY, &file_size);
+ if (supersede_if_exists)
+ {
+ ASSERT (file_size == 7);
+ ASSERT (memcmp (file_contents, "Foobar\n", 7) == 0);
+ }
+ else
+ {
+ ASSERT (file_size == 4);
+ ASSERT (memcmp (file_contents, "New\n", 4) == 0);
+ }
+ }
+ ASSERT (fclose_supersede (fp, &action) == 0);
+
+ ASSERT (stat (linkname, &statbuf) == 0);
+
+ size_t file_size;
+ char *file_contents = read_file (linkname, RF_BINARY, &file_size);
+ ASSERT (file_size == 4);
+ ASSERT (memcmp (file_contents, "New\n", 4) == 0);
+
+ if (supersede_if_exists)
+ {
+ /* Verify that the file now has a different inode number, on the
+ same device. */
+#if !(defined _WIN32 && !defined __CYGWIN__)
+ /* Note: On Linux/mips, statbuf.st_dev is smaller than a dev_t! */
+ dev_t new_dev = statbuf.st_dev;
+ ASSERT (memcmp (&orig_dev, &new_dev, sizeof (dev_t)) == 0);
+ ASSERT (memcmp (&orig_ino, &statbuf.st_ino, sizeof (ino_t)) != 0);
+#endif
+ }
+
+ /* Clean up. */
+ unlink (linkname);
+ }
+ }
+
+ /* Test the case that the file is a symbolic link to an existing character
+ device. */
+ {
+ const char *linkname = "link2";
+ unlink (linkname);
+ if (symlink (DEV_NULL, linkname) >= 0)
+ {
+ ASSERT (stat (linkname, &statbuf) == 0);
+
+ struct supersede_final_action action;
+ FILE *fp =
+ fopen_supersede (linkname, "wb",
+ supersede_if_exists, supersede_if_does_not_exist,
+ &action);
+ ASSERT (fp != NULL);
+ ASSERT (fwrite ("New\n", 1, 4, fp) == 4 && fflush (fp) == 0);
+ ASSERT (stat (linkname, &statbuf) == 0);
+ ASSERT (fclose_supersede (fp, &action) == 0);
+
+ ASSERT (stat (linkname, &statbuf) == 0);
+
+ /* Clean up. */
+ unlink (linkname);
+ }
+ }
+
+ /* Clean up. */
+ unlink (filename);
+
+ /* Test the case that the file is a symbolic link to a nonexistent file in an
+ existing directory. */
+ {
+ const char *linkname = "link3";
+ unlink (linkname);
+ if (symlink (filename, linkname) >= 0)
+ {
+ ASSERT (stat (linkname, &statbuf) < 0);
+
+ struct supersede_final_action action;
+ FILE *fp =
+ fopen_supersede (linkname, "wb",
+ supersede_if_exists, supersede_if_does_not_exist,
+ &action);
+ ASSERT (fp != NULL);
+ ASSERT (fwrite ("Hello world\n", 1, 12, fp) == 12 && fflush (fp) == 0);
+ if (supersede_if_does_not_exist)
+ ASSERT (stat (linkname, &statbuf) < 0);
+ else
+ ASSERT (stat (linkname, &statbuf) == 0);
+ ASSERT (fclose_supersede (fp, &action) == 0);
+
+ ASSERT (stat (linkname, &statbuf) == 0);
+
+ size_t file_size;
+ char *file_contents = read_file (linkname, RF_BINARY, &file_size);
+ ASSERT (file_size == 12);
+ ASSERT (memcmp (file_contents, "Hello world\n", 12) == 0);
+
+ /* Clean up. */
+ unlink (linkname);
+ }
+ }
+
+ /* Test the case that the file is a symbolic link to a nonexistent file in a
+ nonexistent directory. */
+ {
+ const char *linkname = "link4";
+ unlink (linkname);
+ if (symlink ("/nonexistent/gnulibtest8237/24715863701440", linkname) >= 0)
+ {
+ ASSERT (stat (linkname, &statbuf) < 0);
+
+ struct supersede_final_action action;
+ FILE *fp =
+ fopen_supersede (linkname, "wb",
+ supersede_if_exists, supersede_if_does_not_exist,
+ &action);
+ ASSERT (fp == NULL);
+ ASSERT (errno == ENOENT);
+
+ ASSERT (stat (linkname, &statbuf) < 0);
+
+ /* Clean up. */
+ unlink (linkname);
+ }
+ }
+
+ /* Clean up. */
+ unlink (filename);
+ rmdir (dir);
+}

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