--- /dev/null
+/*
+ * Copyright (c) 2006, 2010, 2013 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#ifndef _SYSTEM_SIMPLE_H_
+#define _SYSTEM_SIMPLE_H_
+
+#include <sys/cdefs.h>
+#include <stdarg.h>
+
+#include <Availability.h>
+
+typedef void *_SIMPLE_STRING;
+typedef const char *_esc_func(unsigned char);
+
+__BEGIN_DECLS
+/*
+ * A simplified vfprintf variant. The format string is interpreted with
+ * arguments from the va_list, and the results are written to the given
+ * file descriptor.
+ */
+void _simple_vdprintf(int __fd, const char *__fmt, va_list __ap) __printflike(2, 0);
+
+/*
+ * A simplified fprintf variant. The format string is interpreted with
+ * arguments from the variable argument list, and the results are written
+ * to the given file descriptor.
+ */
+void _simple_dprintf(int __fd, const char *__fmt, ...) __printflike(2, 3);
+
+/*
+ * A simplified string allocate routine. Pass the opaque pointer to structure
+ * to _simple_*sprintf() routines. Use _simple_string() to retrieve the
+ * current string (the string is guaranteed to be null terminated only on
+ * the call to _simple_string()). Use _simple_sfree() to free the structure
+ * and string memory.
+ */
+_SIMPLE_STRING _simple_salloc(void);
+
+/*
+ * The format string is interpreted with arguments from the va_list, and the
+ * results are appended to the string maintained by the opaque structure, as
+ * returned by a previous call to _simple_salloc(). Non-zero is returned on
+ * out-of-memory error.
+ */
+int _simple_vsprintf(_SIMPLE_STRING __b, const char *__fmt, va_list __ap) __printflike(2, 0);
+
+/*
+ * The format string is interpreted with arguments from the variable argument
+ * list, and the results are appended to the string maintained by the opaque
+ * structure, as returned by a previous call to _simple_salloc(). Non-zero is
+ * returned on out-of-memory error.
+ */
+int _simple_sprintf(_SIMPLE_STRING __b, const char *__fmt, ...) __printflike(2, 3);
+
+/*
+ * Like _simple_vsprintf(), except __esc is a function to call on each
+ * character; the function returns NULL if the character should be passed
+ * as is, otherwise, the returned character string is used instead.
+ */
+int _simple_vesprintf(_SIMPLE_STRING __b, _esc_func __esc, const char *__fmt, va_list __ap) __printflike(3, 0);
+
+/*
+ * Like _simple_sprintf(), except __esc is a function to call on each
+ * character; the function returns NULL if the character should be passed
+ * as is, otherwise, the returned character string is used instead.
+ */
+int _simple_esprintf(_SIMPLE_STRING __b, _esc_func __esc, const char *__fmt, ...) __printflike(3, 4);
+
+/*
+ * Return the null terminated string from the opaque structure, as returned
+ * by a previous call to _simple_salloc().
+ */
+char *_simple_string(_SIMPLE_STRING __b);
+
+/*
+ * Reposition the pointer to the first null in the buffer. After a call to
+ * _simple_string, the buffer can be modified, and shrunk.
+ */
+void _simple_sresize(_SIMPLE_STRING __b);
+
+/*
+ * Append the null-terminated string to the string associated with the opaque
+ * structure. Non-zero is returned on out-of-memory error.
+ */
+int _simple_sappend(_SIMPLE_STRING __b, const char *__str);
+
+/*
+ * Like _simple_sappend(), except __esc is a function to call on each
+ * character; the function returns NULL if the character should be passed
+ * as is, otherwise, the returned character string is used instead.
+ */
+int _simple_esappend(_SIMPLE_STRING __b, _esc_func __esc, const char *__str);
+
+/*
+ * Write the string associated with the opaque structure to the file descriptor.
+ */
+void _simple_put(_SIMPLE_STRING __b, int __fd);
+
+/*
+ * Write the string associated with the opaque structure and a trailing newline,
+ * to the file descriptor.
+ */
+void _simple_putline(_SIMPLE_STRING __b, int __fd);
+
+/*
+ * Free the opaque structure, and the associated string.
+ */
+void _simple_sfree(_SIMPLE_STRING __b);
+
+/*
+ * Simplified ASL log interface; does not use malloc. Unfortunately, this
+ * requires knowledge of the format used by ASL.
+ */
+#ifndef ASL_LEVEL_DEBUG
+#define ASL_LEVEL_EMERG 0
+#define ASL_LEVEL_ALERT 1
+#define ASL_LEVEL_CRIT 2
+#define ASL_LEVEL_ERR 3
+#define ASL_LEVEL_WARNING 4
+#define ASL_LEVEL_NOTICE 5
+#define ASL_LEVEL_INFO 6
+#define ASL_LEVEL_DEBUG 7
+#endif
+
+void _simple_asl_log(int __level, const char *__facility, const char *__message);
+void _simple_asl_log_prog(int level, const char *facility, const char *message, const char *progname);
+
+__OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0)
+_SIMPLE_STRING _simple_asl_msg_new(void);
+
+__OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0)
+void _simple_asl_msg_set(_SIMPLE_STRING __b, const char *__key, const char *__val);
+
+__OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0)
+void _simple_asl_send(_SIMPLE_STRING __b);
+
+__OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0)
+const char *_simple_getenv(const char *envp[], const char *var);
+
+__END_DECLS
+
+#endif /* _SYSTEM_SIMPLE_H_ */