Print.cpp

/*
 Print.cpp - Base class that provides print() and println()
 Copyright (c) 2008 David A. Mellis.  All right reserved.

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 Modified 23 November 2006 by David A. Mellis
 Modified 03 August 2015 by Chuck Todd
 */

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#include "Arduino.h"

#include "Print.h"

// Public Methods //////////////////////////////////////////////////////////////

/* default implementation: may be overridden */
size_t Print::write(const uint8_t *buffer, size_t size)
{
  size_t n = 0;
  while (size--) {
    if (write(*buffer++)) {
      n++;
    } else {
      break;
    }
  }
  return n;
}

size_t Print::print(const __FlashStringHelper *ifsh)
{
  return print(reinterpret_cast<const char *>(ifsh));
}

size_t Print::print(const String &s)
{
  return write(s.c_str(), s.length());
}

size_t Print::print(const char str[])
{
  return write(str);
}

size_t Print::print(char c)
{
  return write(c);
}

size_t Print::print(unsigned char b, int base)
{
  return print((unsigned long) b, base);
}

size_t Print::print(int n, int base)
{
  return print((long) n, base);
}

size_t Print::print(unsigned int n, int base)
{
  return print((unsigned long) n, base);
}

size_t Print::print(long n, int base)
{
  if (base == 0) {
    return write(n);
  } else if (base == 10) {
    if (n < 0) {
      int t = print('-');
      n = -n;
      return printNumber(n, 10) + t;
    }
    return printNumber(n, 10);
  } else {
    return printNumber(n, base);
  }
}

size_t Print::print(unsigned long n, int base)
{
  if (base == 0) {
    return write(n);
  } else {
    return printNumber(n, base);
  }
}

size_t Print::print(double n, int digits)
{
  return printFloat(n, digits);
}

size_t Print::println(const __FlashStringHelper *ifsh)
{
  size_t n = print(ifsh);
  n += println();
  return n;
}

size_t Print::print(const Printable &x)
{
  return x.printTo(*this);
}

size_t Print::println(void)
{
  return write("\r\n");
}

size_t Print::println(const String &s)
{
  size_t n = print(s);
  n += println();
  return n;
}

size_t Print::println(const char c[])
{
  size_t n = print(c);
  n += println();
  return n;
}

size_t Print::println(char c)
{
  size_t n = print(c);
  n += println();
  return n;
}

size_t Print::println(unsigned char b, int base)
{
  size_t n = print(b, base);
  n += println();
  return n;
}

size_t Print::println(int num, int base)
{
  size_t n = print(num, base);
  n += println();
  return n;
}

size_t Print::println(unsigned int num, int base)
{
  size_t n = print(num, base);
  n += println();
  return n;
}

size_t Print::println(long num, int base)
{
  size_t n = print(num, base);
  n += println();
  return n;
}

size_t Print::println(unsigned long num, int base)
{
  size_t n = print(num, base);
  n += println();
  return n;
}

size_t Print::println(double num, int digits)
{
  size_t n = print(num, digits);
  n += println();
  return n;
}

size_t Print::println(const Printable &x)
{
  size_t n = print(x);
  n += println();
  return n;
}

extern "C" {
  __attribute__((weak))
  int _write(int file, char *ptr, int len)
  {
#if defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
    switch (file) {
      case STDOUT_FILENO:
      case STDERR_FILENO:
        uart_debug_write((uint8_t *)ptr, (uint32_t)len);
        break;
      case STDIN_FILENO:
        break;
      default:
        ((class Print *)file)->write((uint8_t *)ptr, len);
        break;
    }
#else
    (void)file;
    (void)ptr;
#endif
    return len;
  }
}

int Print::printf(const char *format, ...)
{
  va_list ap;
  va_start(ap, format);
  return vdprintf((int)this, format, ap);
}

int Print::printf(const __FlashStringHelper *format, ...)
{
  va_list ap;
  va_start(ap, format);
  return vdprintf((int)this, (const char *)format, ap);
}

// Private Methods /////////////////////////////////////////////////////////////

size_t Print::printNumber(unsigned long n, uint8_t base)
{
  char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
  char *str = &buf[sizeof(buf) - 1];

  *str = '\0';

  // prevent crash if called with base == 1
  if (base < 2) {
    base = 10;
  }

  do {
    unsigned long m = n;
    n /= base;
    char c = m - base * n;
    *--str = c < 10 ? c + '0' : c + 'A' - 10;
  } while (n);

  return write(str);
}

size_t Print::printFloat(double number, uint8_t digits)
{
  size_t n = 0;

  if (isnan(number)) {
    return print("nan");
  }
  if (isinf(number)) {
    return print("inf");
  }
  if (number > 4294967040.0) {
    return print("ovf");  // constant determined empirically
  }
  if (number < -4294967040.0) {
    return print("ovf");  // constant determined empirically
  }

  // Handle negative numbers
  if (number < 0.0) {
    n += print('-');
    number = -number;
  }

  // Round correctly so that print(1.999, 2) prints as "2.00"
  double rounding = 0.5;
  for (uint8_t i = 0; i < digits; ++i) {
    rounding /= 10.0;
  }

  number += rounding;

  // Extract the integer part of the number and print it
  unsigned long int_part = (unsigned long)number;
  double remainder = number - (double)int_part;
  n += print(int_part);

  // Print the decimal point, but only if there are digits beyond
  if (digits > 0) {
    n += print(".");
  }

  // Extract digits from the remainder one at a time
  while (digits-- > 0) {
    remainder *= 10.0;
    int toPrint = int(remainder);
    n += print(toPrint);
    remainder -= toPrint;
  }

  return n;
}

#ifdef SUPPORT_LONGLONG

void Print::println(int64_t n, uint8_t base)
{
  print(n, base);
  println();
}

void Print::print(int64_t n, uint8_t base)
{
  if (n < 0) {
    print((char)'-');
    n = -n;
  }
  if (base < 2) {
    base = 2;
  }
  print((uint64_t)n, base);
}

void Print::println(uint64_t n, uint8_t base)
{
  print(n, base);
  println();
}

void Print::print(uint64_t n, uint8_t base)
{
  if (base < 2) {
    base = 2;
  }
  printLLNumber(n, base);
}

void Print::printLLNumber(uint64_t n, uint8_t base)
{
  unsigned char buf[16 * sizeof(long)];
  unsigned int i = 0;

  if (n == 0) {
    print((char)'0');
    return;
  }

  while (n > 0) {
    buf[i++] = n % base;
    n /= base;
  }

  for (; i > 0; i--) {
    print((char)(buf[i - 1] < 10 ? '0' + buf[i - 1] : 'A' + buf[i - 1] - 10));
  }
}
#endif