nanoprintf.cpp

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/*
 * Copyright (c) 2004,2012 Kustaa Nyholm / SpareTimeLabs
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 *
 * Neither the name of the Kustaa Nyholm or SpareTimeLabs nor the names of its
 * contributors may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

#include "nanoprintf.h"

namespace rosflight_firmware
{
namespace nanoprintf
{
typedef void (*putcf)(void *, char);
static putcf stdout_putf;
static void *stdout_putp;

#ifdef PRINTF_LONG_SUPPORT

static void uli2a(unsigned long int num, unsigned int base, int uc, char *bf)
{
  int n = 0;
  unsigned int d = 1;
  while (num / d >= base) d *= base;
  while (d != 0)
  {
    int dgt = num / d;
    num %= d;
    d /= base;
    if (n || dgt > 0 || d == 0)
    {
      *bf++ = dgt + (dgt < 10 ? '0' : (uc ? 'A' : 'a') - 10);
      ++n;
    }
  }
  *bf = 0;
}

static void li2a(long num, char *bf)
{
  if (num < 0)
  {
    num = -num;
    *bf++ = '-';
  }
  uli2a(num, 10, 0, bf);
}

#endif

static void ui2a(unsigned int num, unsigned int base, int uc, char *bf)
{
  int n = 0;
  unsigned int d = 1;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstrict-overflow"
  while (num / d >= base)
#pragma GCC diagnostic pop
    d *= base;
  while (d != 0)
  {
    int dgt = num / d;
    num %= d;
    d /= base;
    if (n || dgt > 0 || d == 0)
    {
      *bf++ = dgt + (dgt < 10 ? '0' : (uc ? 'A' : 'a') - 10);
      ++n;
    }
  }
  *bf = 0;
}

static void i2a(int num, char *bf)
{
  if (num < 0)
  {
    num = -num;
    *bf++ = '-';
  }
  ui2a(num, 10, 0, bf);
}

static int a2d(char ch)
{
  if (ch >= '0' && ch <= '9')
    return ch - '0';
  else if (ch >= 'a' && ch <= 'f')
    return ch - 'a' + 10;
  else if (ch >= 'A' && ch <= 'F')
    return ch - 'A' + 10;
  else
    return -1;
}

static char a2i(char ch, char **src, int base, int *nump)
{
  char *p = *src;
  int num = 0;
  int digit;
  while ((digit = a2d(ch)) >= 0)
  {
    if (digit > base)
      break;
    num = num * base + digit;
    ch = *p++;
  }
  *src = p;
  *nump = num;
  return ch;
}

static void putchw(void *putp, putcf putf, int n, char z, char *bf)
{
  char fc = z ? '0' : ' ';
  char ch;
  char *p = bf;
  while (*p++ && n != 0) n--;
  while (n-- != 0) putf(putp, fc);
  while ((ch = *bf++)) putf(putp, ch);
}

void tfp_format(void *putp, putcf putf, const char *fmt, va_list va)
{
  char bf[12];

  char ch;

  while ((ch = *(fmt++)))
  {
    if (ch != '%')
      putf(putp, ch);
    else
    {
      char lz = 0;
#ifdef PRINTF_LONG_SUPPORT
      char lng = 0;
#endif
      int w = 0;
      ch = *(fmt++);
      if (ch == '0')
      {
        ch = *(fmt++);
        lz = 1;
      }
      if (ch >= '0' && ch <= '9')
      {
        ch = a2i(ch, const_cast<char **>(&fmt), 10, &w);
      }
#ifdef PRINTF_LONG_SUPPORT
      if (ch == 'l')
      {
        ch = *(fmt++);
        lng = 1;
      }
#endif
      switch (ch)
      {
      case 0:
        goto abort;
      case 'u':
      {
#ifdef PRINTF_LONG_SUPPORT
        if (lng)
          uli2a(va_arg(va, unsigned long int), 10, 0, bf);
        else
#endif
          ui2a(va_arg(va, unsigned int), 10, 0, bf);
        putchw(putp, putf, w, lz, bf);
        break;
      }
      case 'd':
      {
#ifdef PRINTF_LONG_SUPPORT
        if (lng)
          li2a(va_arg(va, unsigned long int), bf);
        else
#endif
          i2a(va_arg(va, int), bf);
        putchw(putp, putf, w, lz, bf);
        break;
      }
      case 'x':
      case 'X':
#ifdef PRINTF_LONG_SUPPORT
        if (lng)
          uli2a(va_arg(va, unsigned long int), 16, (ch == 'X'), bf);
        else
#endif
          ui2a(va_arg(va, unsigned int), 16, (ch == 'X'), bf);
        putchw(putp, putf, w, lz, bf);
        break;
      case 'c':
        putf(putp, static_cast<char>(va_arg(va, int)));
        break;
      case 's':
        putchw(putp, putf, w, 0, va_arg(va, char *));
        break;
      case '%':
        putf(putp, ch);
      default:
        break;
      }
    }
  }
abort:;
}

void init_printf(void *putp, void (*putf)(void *, char))
{
  stdout_putf = putf;
  stdout_putp = putp;
}

void tfp_printf(const char *fmt, ...)
{
  va_list va;
  va_start(va, fmt);
  tfp_format(stdout_putp, stdout_putf, fmt, va);
  va_end(va);
}

static void putcp(void *p, char c)
{
  *(*(static_cast<char **>(p)))++ = c;
}

void tfp_sprintf(char *s, const char *fmt, va_list va)
{
  tfp_format(&s, putcp, fmt, va);
  putcp(&s, 0);
}

} // namespace nanoprintf
} // namespace rosflight_firmware