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101 lines
4.4 KiB
C
101 lines
4.4 KiB
C
//-----------------------------------------------------------------------------
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// Borrowed initially from https://github.com/mpaland/printf
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// Copyright (C) Marco Paland 2014-2019, PALANDesign Hannover, Germany
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// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// See LICENSE.txt for the text of the license.
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//-----------------------------------------------------------------------------
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// Tiny printf, sprintf and (v)snprintf implementation, optimized for speed on
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// embedded systems with a very limited resources. These routines are thread
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// safe and reentrant!
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// Use this instead of the bloated standard/newlib printf cause these use
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// malloc for printf (and may not be thread safe).
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//-----------------------------------------------------------------------------
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#ifndef _PRINTF_H_
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#define _PRINTF_H_
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#include <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdarg.h>
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/**
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* Output a character to a custom device like UART, used by the printf() function
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* This function is declared here only. You have to write your custom implementation somewhere
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* \param character Character to output
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*/
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void _putchar(char character);
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/**
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* Tiny printf implementation
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* You have to implement _putchar if you use printf()
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* To avoid conflicts with the regular printf() API it is overridden by macro defines
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* and internal underscore-appended functions like printf_() are used
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* \param format A string that specifies the format of the output
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* \return The number of characters that are written into the array, not counting the terminating null character
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*/
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#define printf printf_
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int printf_(const char *format, ...);
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/**
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* Tiny sprintf implementation
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* Due to security reasons (buffer overflow) YOU SHOULD CONSIDER USING (V)SNPRINTF INSTEAD!
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* \param buffer A pointer to the buffer where to store the formatted string. MUST be big enough to store the output!
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* \param format A string that specifies the format of the output
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* \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
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*/
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#define sprintf sprintf_
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int sprintf_(char *buffer, const char *format, ...);
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/**
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* Tiny snprintf/vsnprintf implementation
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* \param buffer A pointer to the buffer where to store the formatted string
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* \param count The maximum number of characters to store in the buffer, including a terminating null character
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* \param format A string that specifies the format of the output
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* \param va A value identifying a variable arguments list
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* \return The number of characters that COULD have been written into the buffer, not counting the terminating
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* null character. A value equal or larger than count indicates truncation. Only when the returned value
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* is non-negative and less than count, the string has been completely written.
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*/
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#define snprintf snprintf_
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#define vsnprintf vsnprintf_
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int snprintf_(char *buffer, size_t count, const char *format, ...);
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int vsnprintf_(char *buffer, size_t count, const char *format, va_list va);
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/**
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* Tiny vprintf implementation
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* \param format A string that specifies the format of the output
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* \param va A value identifying a variable arguments list
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* \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
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*/
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#define vprintf vprintf_
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int vprintf_(const char *format, va_list va);
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/**
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* printf with output function
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* You may use this as dynamic alternative to printf() with its fixed _putchar() output
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* \param out An output function which takes one character and an argument pointer
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* \param arg An argument pointer for user data passed to output function
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* \param format A string that specifies the format of the output
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* \return The number of characters that are sent to the output function, not counting the terminating null character
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*/
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int fctprintf(void (*out)(char character, void *arg), void *arg, const char *format, ...);
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#endif // _PRINTF_H_
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