text: /*
  File: tinyprintf.h
  
  Copyright (C) 2004  Kustaa Nyholm
  
  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
  This library is really just two files: 'tinyprintf.h' and 'tinyprintf.c'.
  
  They provide a simple and small (+400 loc) printf functionality to
  be used in embedded systems.
  
  I've found them so useful in debugging that I do not bother with a
  debugger at all.
  
  They are distributed in source form, so to use them, just compile them
  into your project.
  
  Two printf variants are provided: printf and the 'sprintf' family of
  functions ('snprintf', 'sprintf', 'vsnprintf', 'vsprintf').
  
  The formats supported by this implementation are:
  'c' 'd' 'i' 'o' 'p' 'u' 's' 'x' 'X'.
  
  Zero padding and field width are also supported.
  
  If the library is compiled with 'PRINTF_SUPPORT_LONG' defined, then
  the long specifier is also supported. Note that this will pull in some
  long math routines (pun intended!) and thus make your executable
  noticeably longer. Likewise with 'PRINTF_LONG_LONG_SUPPORT' for the
  long long specifier, and with 'PRINTF_SIZE_T_SUPPORT' for the size_t
  specifier.
  
  The memory footprint of course depends on the target CPU, compiler and
  compiler options, but a rough guesstimate (based on a H8S target) is about
  1.4 kB for code and some twenty 'int's and 'char's, say 60 bytes of stack space.
  Not too bad. Your mileage may vary. By hacking the source code you can
  get rid of some hundred bytes, I'm sure, but personally I feel the balance of
  functionality and flexibility versus  code size is close to optimal for
  many embedded systems.
  
  To use the printf, you need to supply your own character output function,
  something like :
  
  void putc ( void* p, char c)
  {
      while (!SERIAL_PORT_EMPTY) ;
      SERIAL_PORT_TX_REGISTER = c;
  }
  
  Before you can call printf, you need to initialize it to use your
  character output function with something like:
  
  init_printf(NULL,putc);
  
  Notice the 'NULL' in 'init_printf' and the parameter 'void* p' in 'putc',
  the NULL (or any pointer) you pass into the 'init_printf' will eventually be
  passed to your 'putc' routine. This allows you to pass some storage space (or
  anything really) to the character output function, if necessary.
  This is not often needed but it was implemented like that because it made
  implementing the sprintf function so neat (look at the source code).
  
  The code is re-entrant, except for the 'init_printf' function, so it is safe
  to call it from interrupts too, although this may result in mixed output.
  If you rely on re-entrancy, take care that your 'putc' function is re-entrant!
  
  The printf and sprintf functions are actually macros that translate to
  'tfp_printf' and 'tfp_sprintf' when 'TINYPRINTF_OVERRIDE_LIBC' is set
  (default). Setting it to 0 makes it possible to use them along with
  'stdio.h' printf's in a single source file. When
  'TINYPRINTF_OVERRIDE_LIBC' is set, please note that printf/sprintf are
  not function-like macros, so if you have variables or struct members
  with these names, things will explode in your face.  Without variadic
  macros this is the best we can do to wrap these function. If it is a
  problem, just give up the macros and use the functions directly, or
  rename them.
  
  It is also possible to avoid defining tfp_printf and/or tfp_sprintf by
  clearing 'TINYPRINTF_DEFINE_TFP_PRINTF' and/or
  'TINYPRINTF_DEFINE_TFP_SPRINTF' to 0. This allows for example to
  export only tfp_format, which is at the core of all the other
  functions.
  
  For further details see source code.
  
  regs Kusti, 23.10.2004
  */
  
  #ifndef __TFP_PRINTF__
  #define __TFP_PRINTF__
  
  #include <stdarg.h>
  
  /* Global configuration */
  
  /* Set this to 0 if you do not want to provide tfp_printf */
  #ifndef TINYPRINTF_DEFINE_TFP_PRINTF
  # define TINYPRINTF_DEFINE_TFP_PRINTF 1
  #endif
  
  /* Set this to 0 if you do not want to provide
     tfp_sprintf/snprintf/vsprintf/vsnprintf */
  #ifndef TINYPRINTF_DEFINE_TFP_SPRINTF
  # define TINYPRINTF_DEFINE_TFP_SPRINTF 1
  #endif
  
  /* Set this to 0 if you do not want tfp_printf and
     tfp_{vsn,sn,vs,s}printf to be also available as
     printf/{vsn,sn,vs,s}printf */
  #ifndef TINYPRINTF_OVERRIDE_LIBC
  # define TINYPRINTF_OVERRIDE_LIBC 1
  #endif
  
  /* Optional external types dependencies */
  
  #if TINYPRINTF_DEFINE_TFP_SPRINTF
  #if defined(__GNUC__)
  # include <sys/types.h>  /* size_t */
  #elif defined(__MIKROC_PRO_FOR_FT90x__)
  # include <stddef.h>  /* size_t */
  #endif
  #endif
  
  /* Declarations */
  
  #ifdef __GNUC__
  # define _TFP_SPECIFY_PRINTF_FMT(fmt_idx,arg1_idx) \
      __attribute__((format (printf, fmt_idx, arg1_idx)))
  #else
  # define _TFP_SPECIFY_PRINTF_FMT(fmt_idx,arg1_idx)
  #endif
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  typedef void (*putcf) (void *, char);
  
  /*
     'tfp_format' really is the central function for all tinyprintf. For
     each output character after formatting, the 'putf' callback is
     called with 2 args:
       - an arbitrary void* 'putp' param defined by the user and
         passed unmodified from 'tfp_format',
       - the character.
     The 'tfp_printf' and 'tfp_sprintf' functions simply define their own
     callback and pass to it the right 'putp' it is expecting.
  */
  void tfp_format(void *putp, putcf putf, const char *fmt, va_list va);
  
  #if TINYPRINTF_DEFINE_TFP_SPRINTF
  int tfp_vsnprintf(char *str, size_t size, const char *fmt, va_list ap);
  int tfp_snprintf(char *str, size_t size, const char *fmt, ...) \
       _TFP_SPECIFY_PRINTF_FMT(3, 4);
  int tfp_vsprintf(char *str, const char *fmt, va_list ap);
  int tfp_sprintf(char *str, const char *fmt, ...) \
      _TFP_SPECIFY_PRINTF_FMT(2, 3);
  # if TINYPRINTF_OVERRIDE_LIBC
  #  define vsnprintf tfp_vsnprintf
  #  define snprintf tfp_snprintf
  #  define vsprintf tfp_vsprintf
  #  define sprintf tfp_sprintf
  # endif
  #endif
  
  #if TINYPRINTF_DEFINE_TFP_PRINTF
  void init_printf(void *putp, putcf putf);
  void tfp_printf(char *fmt, ...) _TFP_SPECIFY_PRINTF_FMT(1, 2);
  # if TINYPRINTF_OVERRIDE_LIBC
  #  define printf tfp_printf
  # endif
  #endif
  
  #ifdef  __cplusplus
  }
  #endif
  
  #endif