test/WriteFile: new debug program

Makefile.am

@@ -1533,6 +1533,7 @@ noinst_PROGRAMS = \
 	test/read_conf \
 	test/run_resolver \
 	test/run_input \
+	test/WriteFile \
 	test/dump_text_file \
 	test/dump_playlist \
 	test/run_decoder \
@@ -1727,6 +1728,16 @@ test_run_gunzip_LDADD = \
 
 endif
 
+test_WriteFile_LDADD = \
+	$(FS_LIBS) \
+	$(ICU_LDADD) \
+	libsystem.a \
+	libutil.a \
+	$(GLIB_LIBS)
+test_WriteFile_SOURCES = \
+	src/Log.cxx src/LogBackend.cxx \
+	test/WriteFile.cxx
+
 test_dump_text_file_LDADD = \
 	$(INPUT_LIBS) \
 	$(ARCHIVE_LIBS) \

test/WriteFile.cxx

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2003-2015 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "fs/io/FileOutputStream.hxx"
+#include "util/Error.hxx"
+
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+static bool
+Copy(OutputStream &dest, int src)
+{
+	Error error;
+
+	while (true) {
+		uint8_t buffer[8192];
+		ssize_t nbytes = read(src, buffer, sizeof(buffer));
+		if (nbytes < 0) {
+			fprintf(stderr, "Failed to read from stdin: %s\n",
+				strerror(errno));
+			return false;
+		}
+
+		if (nbytes == 0)
+			return true;
+
+		if (!dest.Write(buffer, nbytes, error)) {
+			fprintf(stderr, "%s\n", error.GetMessage());
+			return false;
+		}
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: WriteFile PATH\n");
+		return EXIT_FAILURE;
+	}
+
+	const Path path = Path::FromFS(argv[1]);
+
+	Error error;
+	FileOutputStream fos(path, error);
+	if (!fos.IsDefined()) {
+		fprintf(stderr, "%s\n", error.GetMessage());
+		return EXIT_FAILURE;
+	}
+
+	if (!Copy(fos, STDIN_FILENO))
+		return EXIT_FAILURE;
+
+	if (!fos.Commit(error)) {
+		fprintf(stderr, "%s\n", error.GetMessage());
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}