// Copyright 2017 Open Source Robotics Foundation, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef RCUTILS__SNPRINTF_H_
#define RCUTILS__SNPRINTF_H_

#ifdef __cplusplus
extern "C"
{
#endif

#include <stdarg.h>
#include <stddef.h>

#include "rcutils/macros.h"
#include "rcutils/visibility_control.h"

/// Format a string.
/**
 * This function just wraps snprintf() as defined in C11 in a portable way.
 *
 * On Windows this defaults to the _TRUNCATE behavior of _snprintf_s(), but
 * only returns -1 if errno is not 0.
 * Unlike _snprintf_s() which returns -1 when truncation occurs, this function
 * behaves like snprintf() (http://en.cppreference.com/w/cpp/io/c/fprintf):
 *
 * > Number of characters written if successful or negative value if an error
 * > occurred.
 * > If the resulting string gets truncated due to buf_size limit, function
 * > returns the total number of characters (not including the terminating
 * > null-byte) which would have been written, if the limit was not imposed.
 *
 * If `NULL` and `0` are given for buffer and buffer_size respectively, the
 * size of the string that would be generated is returned.
 * Either snprintf() or _vscprintf() is used to calculate this value.
 *
 * \see snprintf()
 * \see _snprintf_s()
 * \returns the number of bytes that would have been written given enough space,
 *   or a negative number if there is an error, but unlike _snprintf_s(),
 *   -1 is not returned if there is truncation.
 */
RCUTILS_PUBLIC
RCUTILS_WARN_UNUSED
int
rcutils_snprintf(char * buffer, size_t buffer_size, const char * format, ...)
RCUTILS_ATTRIBUTE_PRINTF_FORMAT(3, 4);

/// Format a string with va_list for arguments, see rcutils_snprintf().
RCUTILS_PUBLIC
RCUTILS_WARN_UNUSED
int
rcutils_vsnprintf(char * buffer, size_t buffer_size, const char * format, va_list args);

#ifdef __cplusplus
}
#endif

#endif  // RCUTILS__SNPRINTF_H_