mirror of
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236 lines
7.1 KiB
C++
236 lines
7.1 KiB
C++
/**
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* Print.cpp - Base class that provides print() and println()
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* Copyright (c) 2008 David A. Mellis. All right reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Modified 23 November 2006 by David A. Mellis
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* Modified 03 August 2015 by Chuck Todd
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* Modified 03 February 2018 by Scott Lahteine
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <inttypes.h>
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#include "Print.h"
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#include <stdarg.h>
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#define ENABLE_PRINTF
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// Public Methods //////////////////////////////////////////////////////////////
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/* default implementation: may be overridden */
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size_t Print::write(const uint8_t *buffer, size_t size) {
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size_t n = 0;
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while (size--) {
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if (write(*buffer++)) n++;
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else break;
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}
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return n;
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}
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size_t Print::print(const char str[]) { return write(str); }
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size_t Print::print(char c) { return write(c); }
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size_t Print::print(unsigned char b, int base) { return print((unsigned long) b, base); }
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size_t Print::print(int n, int base) { return print((long) n, base); }
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size_t Print::print(unsigned int n, int base) { return print((unsigned long) n, base); }
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size_t Print::print(double n, int digits) { return printFloat(n, digits); }
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size_t Print::print(const Printable& x) { return x.printTo(*this); }
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size_t Print::println(void) { return write("\r\n"); }
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size_t Print::print(long n, int base) {
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if (base == 0) return write(n);
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if (base == 10) {
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if (n < 0) {
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const int t = print('-');
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return printNumber(-n, 10) + t;
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}
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}
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return printNumber(n, base);
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}
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size_t Print::print(unsigned long n, int base) {
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if (base == 0) return write(n);
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return printNumber(n, base);
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}
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#define PRINTLN(...) do{ \
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size_t n = print(__VA_ARGS__); \
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n += println(); \
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return n; \
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}while(0)
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size_t Print::println(const char c[]) { PRINTLN(c); }
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size_t Print::println(char c) { PRINTLN(c); }
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size_t Print::println(unsigned char b, int base) { PRINTLN(b, base); }
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size_t Print::println(int num, int base) { PRINTLN(num, base); }
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size_t Print::println(unsigned int num, int base) { PRINTLN(num, base); }
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size_t Print::println(long num, int base) { PRINTLN(num, base); }
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size_t Print::println(unsigned long num, int base) { PRINTLN(num, base); }
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size_t Print::println(double num, int digits) { PRINTLN(num, digits); }
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size_t Print::println(const Printable& x) { PRINTLN(x); }
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// Private Methods /////////////////////////////////////////////////////////////
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size_t Print::printNumber(unsigned long n, uint8_t base) {
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char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
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char *str = &buf[sizeof(buf) - 1];
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*str = '\0';
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// prevent crash if called with base == 1
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if (base < 2) base = 10;
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do {
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unsigned long m = n;
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n /= base;
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char c = m - base * n;
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*--str = c < 10 ? c + '0' : c + 'A' - 10;
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} while(n);
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return write(str);
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}
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size_t Print::printFloat(double number, uint8_t digits) {
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size_t n = 0;
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if (isnan(number)) return print("nan");
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if (isinf(number)) return print("inf");
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if (number > 4294967040.0) return print ("ovf"); // constant determined empirically
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if (number <-4294967040.0) return print ("ovf"); // constant determined empirically
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// Handle negative numbers
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if (number < 0.0) {
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n += print('-');
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number = -number;
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}
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// Round correctly so that print(1.999, 2) prints as "2.00"
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double rounding = 0.5;
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for (uint8_t i = 0; i < digits; ++i) rounding /= 10.0;
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number += rounding;
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// Extract the integer part of the number and print it
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uint32_t int_part = (uint32_t)number;
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double remainder = number - (double)int_part;
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n += print(int_part);
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// Print the decimal point, but only if there are digits beyond
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if (digits > 0) n += print('.');
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// Extract digits from the remainder one at a time
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while (digits-- > 0) {
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remainder *= 10.0;
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const int toPrint = int(remainder);
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n += print(toPrint);
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remainder -= toPrint;
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}
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return n;
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}
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#ifdef ENABLE_PRINTF
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size_t Print::printf(const char *argList, ...) {
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const char *ptr;
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double floatNum_f32;
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va_list argp;
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int16_t num_s16;
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int32_t num_s32;
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uint16_t num_u16;
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uint32_t num_u32;
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char *str;
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char ch;
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uint8_t numOfDigits;
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va_start(argp, argList);
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// Loop through the list to extract all the input arguments
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for (ptr = argList; (ch = *ptr); ptr++) {
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if (ch == '%') { //Check for '%' as there will be format specifier after it
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ptr++;
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ch = *ptr;
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if (ch >= '0' && ch <= '9') {
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numOfDigits = 0;
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while (ch >= '0' && ch <= '9') {
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numOfDigits = numOfDigits * 10 + ch - '0';
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ptr++;
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ch = *ptr;
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}
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}
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else
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numOfDigits = 0xFF;
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switch(ch) { // Decode the type of the argument
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case 'C':
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case 'c': // Argument type is of char, hence read char data from the argp
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ch = va_arg(argp, int);
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print(ch);
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break;
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case 'd': // Argument type is of signed integer, hence read 16bit data from the argp
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case 'D':
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num_s32 = va_arg(argp, int);
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print(num_s32, 10);
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break;
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case 'u':
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case 'U': // Argument type is of integer, hence read 32bit unsigend data
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num_u32 = va_arg(argp, uint32_t);
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print(num_u32, 10);
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break;
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case 'x':
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case 'X': // Argument type is of hex, hence hexadecimal data from the argp
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num_u32 = va_arg(argp, uint32_t);
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print(num_u32, 16);
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break;
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case 'b':
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case 'B': // Argument type is of binary,Read int and convert to binary
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num_u32 = va_arg(argp, uint32_t);
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print(num_u32, 2);
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break;
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case 'F':
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case 'f': // Argument type is of float, hence read double data from the argp
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floatNum_f32 = va_arg(argp, double);
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printFloat(floatNum_f32, 10);
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break;
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case 'S':
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case 's': // Argument type is of string, hence get the pointer to sting passed
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str = va_arg(argp, char *);
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print(str);
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break;
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case '%':
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print('%');
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break;
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}
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}
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else
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print(ch); // As '%' is not detected transmit the char passed
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}
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va_end(argp);
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}
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#endif // ENABLE_PRINTF
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