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