///////////////////////////////////////////////////////////////////////////////
// \author (c) Marco Paland (info@paland.com)
//             2014-2019, PALANDesign Hannover, Germany
//
// \license The MIT License (MIT)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
// \brief Tiny printf, sprintf and snprintf implementation, optimized for speed on
//        embedded systems with a very limited resources.
//        Use this instead of bloated standard/newlib printf.
//        These routines are thread safe and reentrant.
//
///////////////////////////////////////////////////////////////////////////////

#pragma once

#ifndef FB_JSON_PRINT_H
#define FB_JSON_PRINT_H

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

#ifdef __cplusplus
extern "C"
{
#endif

    /**
     * Output a character to a custom device like UART, used by the printf() function
     * This function is declared here only. You have to write your custom implementation somewhere
     * \param character Character to output
     */
    void fb_json_putchar(char character) __attribute__((used));

    /**
     * Tiny printf implementation
     * You have to implement _putchar if you use printf()
     * To avoid conflicts with the regular printf() API it is overridden by macro defines
     * and internal underscore-appended functions like printf_() are used
     * \param format A string that specifies the format of the output
     * \return The number of characters that are written into the array, not counting the terminating null character
     */
    int fb_json_printf(const char *format, ...) __attribute__((used));

    /**
     * Tiny sprintf implementation
     * Due to security reasons (buffer overflow) YOU SHOULD CONSIDER USING (V)SNPRINTF INSTEAD!
     * \param buffer A pointer to the buffer where to store the formatted string. MUST be big enough to store the output!
     * \param format A string that specifies the format of the output
     * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
     */
    int fb_json_sprintf(char *buffer, const char *format, ...) __attribute__((used));

    /**
     * Tiny snprintf/vsnprintf implementation
     * \param buffer A pointer to the buffer where to store the formatted string
     * \param count The maximum number of characters to store in the buffer, including a terminating null character
     * \param format A string that specifies the format of the output
     * \param va A value identifying a variable arguments list
     * \return The number of characters that COULD have been written into the buffer, not counting the terminating
     *         null character. A value equal or larger than count indicates truncation. Only when the returned value
     *         is non-negative and less than count, the string has been completely written.
     */
#define fb_json_snprintf fb_json_snprintf_
#define fb_json_vsnprintf fb_json_vsnprintf_
    int fb_json_snprintf_(char *buffer, size_t count, const char *format, ...) __attribute__((used));
    int fb_json_vsnprintf_(char *buffer, size_t count, const char *format, va_list va) __attribute__((used));

    /**
     * Tiny vprintf implementation
     * \param format A string that specifies the format of the output
     * \param va A value identifying a variable arguments list
     * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
     */
    int fb_json_vprintf(const char *format, va_list va) __attribute__((used));

    /**
     * printf with output function
     * You may use this as dynamic alternative to printf() with its fixed _putchar() output
     * \param out An output function which takes one character and an argument pointer
     * \param arg An argument pointer for user data passed to output function
     * \param format A string that specifies the format of the output
     * \return The number of characters that are sent to the output function, not counting the terminating null character
     */
    int fb_json_fnprintf(void (*out)(char character, void *arg), void *arg, const char *format, ...) __attribute__((used));

#ifdef __cplusplus
}
#endif

#endif // _PRINTF_H_