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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef VBOOT_REFERENCE_CROSSYSTEM_H_
#define VBOOT_REFERENCE_CROSSYSTEM_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <stddef.h>
/* Recommended size for string property buffers used with
* VbGetSystemPropertyString(). */
#define VB_MAX_STRING_PROPERTY ((size_t) 8192)
/* Reads a system property integer.
*
* Returns the property value, or -1 if error. */
int VbGetSystemPropertyInt(const char* name);
/* Read a system property string into a destination buffer of the
* specified size. Returned string will be null-terminated. If the
* buffer is too small, the returned string will be truncated.
*
* The caller can expect an un-truncated value if the size provided is
* at least VB_MAX_STRING_PROPERTY.
*
* Returns the passed buffer, or NULL if error. */
const char* VbGetSystemPropertyString(const char* name, char* dest,
size_t size);
/* Sets a system property integer.
*
* Returns 0 if success, -1 if error. */
int VbSetSystemPropertyInt(const char* name, int value);
/* Set a system property string.
*
* The maximum length of the value accepted depends on the specific
* property, not on VB_MAX_STRING_PROPERTY.
*
* Returns 0 if success, -1 if error. */
int VbSetSystemPropertyString(const char* name, const char* value);
#ifdef __cplusplus
}
#endif
#endif /* VBOOT_REFERENCE_CROSSYSTEM_H_ */
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