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// Ripped out of latest ecos build from http://sources-redhat.mirrors.airband.net/ecos/releases/ecos-3.0b1/ecos-3.0beta1.i386linux.tar.bz2

// File: ecos-3.0b1/packages/language/c/libc/stdio/v3_0b1/src/output/vfnprintf.cxx

//  Hacked to pieces so it would work with OpenRISC compiler, not using libc

//===========================================================================

//

//      vfnprintf.c

//

//      I/O routines for vfnprintf() for use with ANSI C library

//

//===========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under    

// the terms of the GNU General Public License as published by the Free     

// Software Foundation; either version 2 or (at your option) any later      

// version.                                                                 

//

// eCos 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 General Public License    

// for more details.                                                        

//

// You should have received a copy of the GNU General Public License        

// along with eCos; if not, write to the Free Software Foundation, Inc.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            

//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

// and link it with other works to produce a work based on this file,       

// this file does not by itself cause the resulting work to be covered by   

// the GNU General Public License. However the source code for this file    

// must still be made available in accordance with section (3) of the GNU   

// General Public License v2.                                               

//

// This exception does not invalidate any other reasons why a work based    

// on this file might be covered by the GNU General Public License.         

// -------------------------------------------                              

// ####ECOSGPLCOPYRIGHTEND####                                              

//===========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    jlarmour

// Contributors: 

// Date:         2000-04-20

// Purpose:     

// Description: 

// Usage:       

//

//####DESCRIPTIONEND####

//

//===========================================================================

//

// This code is based on original code with the following copyright:

//

/*-

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Chris Torek.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. 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.

 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.

 */

// CONFIGURATION

//#include <pkgconf/libc_stdio.h>   // Configuration header

//#include <pkgconf/libc_i18n.h>    // Configuration header for mb support

// INCLUDES

#include <stdlib.h> // For mbtowc()

#include <stddef.h>

//#include <cyg/infra/cyg_type.h>   // Common type definitions and support

#define CYG_MACRO_START do {

#define CYG_MACRO_END   } while (0)

#define CYG_EMPTY_STATEMENT CYG_MACRO_START CYG_MACRO_END

#define CYG_UNUSED_PARAM( _type_, _name_ ) CYG_MACRO_START      \

  _type_ __tmp1 = (_name_);                                     \

  _type_ __tmp2 = __tmp1;                                       \

  __tmp1 = __tmp2;                                              \

CYG_MACRO_END

#include <stdarg.h>               // Variable argument definitions

//#include <stdio.h>                // Standard header for all stdio files

#include <string.h>               // memchr() and strlen() functions

//#include <cyg/libc/stdio/stream.hxx> // C library streams

#include "vfnprintf.h"

# define BUF            40

/*

 * Actual printf innards.

 *

 * This code is large and complicated...

 */

/*

 * Macros for converting digits to letters and vice versa

 */

#define to_digit(c)     ((c) - '0')

#define is_digit(c)     ((unsigned)to_digit(c) <= 9)

#define to_char(n)      ((n) + '0')

/*

 * Flags used during conversion.

 */

#define ALT             0x001           /* alternate form */

#define HEXPREFIX       0x002           /* add 0x or 0X prefix */

#define LADJUST         0x004           /* left adjustment */

#define LONGDBL         0x008           /* long double; unimplemented */

#define LONGINT         0x010           /* long integer */

#define QUADINT         0x020           /* quad integer */

#define SHORTINT        0x040           /* short integer */

#define ZEROPAD         0x080           /* zero (as opposed to blank) pad */

#define FPT             0x100           /* Floating point number */

#define SIZET           0x200           /* size_t */

// Function which prints back to the buffer, ptr, len bytes

// returns 1 if it should finish up, otherwise 0 to continue

int print_back_to_string(char * ptr, int len, size_t * n, int * ret, char ** stream)

{

#define MIN(a, b) ((a) < (b) ? (a) : (b))

  do {

    int length = MIN( (int) len, *n - *ret - 1);

    memcpy(*stream + *ret, ptr, length);

    if (length < (int)len) {

      *ret += length;

      return 1; // finish up

    }

  } while(0);

    return 0;

}

//externC int 

int

//vfnprintf ( FILE *stream, size_t n, const char *format, va_list arg) __THROW

vfnprintf ( char *stream, size_t n, const char *format, va_list arg)

{

  char *fmt;     /* format string */

  int ch;        /* character from fmt */

  int x, y;      /* handy integers (short term usage) */

  char *cp;      /* handy char pointer (short term usage) */

  int flags;     /* flags as above */

  int ret;                /* return value accumulator */

  int width;              /* width from format (%8d), or 0 */

  int prec;               /* precision from format (%.3d), or -1 */

  char sign;              /* sign prefix (' ', '+', '-', or \0) */

  wchar_t wc;

#define quad_t    long long

#define u_quad_t  unsigned long long

  u_quad_t _uquad;        /* integer arguments %[diouxX] */

  enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */

  int dprec;              /* a copy of prec if [diouxX], 0 otherwise */

  int fieldsz;            /* field size expanded by sign, etc */

  int realsz;             /* field size expanded by dprec */

  int size;               /* size of converted field or string */

  char *xdigs;            /* digits for [xX] conversion */

#define NIOV 8

  char buf[BUF];          /* space for %c, %[diouxX], %[eEfgG] */

  char ox[2];             /* space for 0x hex-prefix */

  /*

   * Choose PADSIZE to trade efficiency vs. size.  If larger printf

   * fields occur frequently, increase PADSIZE and make the initialisers

   * below longer.

   */

#define PADSIZE 16              /* pad chunk size */

  static char blanks[PADSIZE] =

    {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};

  static char zeroes[PADSIZE] =

    {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};

  /*

   * BEWARE, these `goto error' on error, and PAD uses `n'.

   */

  // We'll copy len bytes from (char*) ptr, into the output stream

  // making sure we don't go over the end, so calculate length to be

  // either the whole length we've been passed, or the whole length

  // that is possible to write

  // We finish if it was not possible to write the entire variable

  // into the buffer, ie we had to write all we could, not all we

  // wanted to.

  /*

    #define PRINT(ptr, len)                                             \

    CYG_MACRO_START                                                     \

    int length = MIN( (int) len, n - ret - 1);                          \

    char* begin_stream_write = stream;                                  \

    stream = memcpy(stream, ptr, length);                               \

    length = (unsigned long) stream - (unsigned long) begin_stream_write; \

    if (length < (int)len) {                                            \

    ret += length;                                                      \

    goto done;                                                          \

    }                                                                   \

    CYG_MACRO_END

  */

        //PRINT(with, PADSIZE);                                         \

      //PRINT(with, x);                                                 \

#define PAD(howmany, with)                                              \

  CYG_MACRO_START                                                       \

    if ((x = (howmany)) > 0) {                                           \

      while (x > PADSIZE) {                                             \

        if (print_back_to_string(with, PADSIZE, &n, &ret, &stream)) goto done; \

        x -= PADSIZE;                                                   \

      }                                                                 \

      if (print_back_to_string(with, x, &n, &ret, &stream))goto done;   \

    }                                                                   \

  CYG_MACRO_END

  /*

   * To extend shorts properly, we need both signed and unsigned

   * argument extraction methods.

   */

#define SARG()                                    \

  (flags&QUADINT ? va_arg(arg, long long) :       \

   flags&LONGINT ? va_arg(arg, long) :                       \

   flags&SHORTINT ? (long)(short)va_arg(arg, int) :          \

   flags&SIZET ? (long)va_arg(arg, size_t) :                 \

   (long)va_arg(arg, int))

#define UARG()                                             \

  (flags&QUADINT ? va_arg(arg, unsigned long long) :       \

   flags&LONGINT ? va_arg(arg, unsigned long) :                         \

   flags&SHORTINT ? (unsigned long)(unsigned short)va_arg(arg, int) :   \

   flags&SIZET ? va_arg(arg, size_t) :                                  \

   (unsigned long)va_arg(arg, unsigned int))

  xdigs = NULL;  // stop compiler whinging

  fmt = (char *)format;

  ret = 0;

  /*

   * Scan the format for conversions (`%' character).

   */

  for (;;) {

    cp = (char *)fmt; // char pointer - set to where we begin looking from

    while ((x = ((wc = *fmt) != 0))) { // While, wc=next char and x is one while there's still chars left

      fmt += x; // increment the pointer to the char

      if (wc == '%') { // check if it's the beginning of

        fmt--; // Decrement the char pointer, actually

        break;

      }

    }

    if ((y = fmt - cp) != 0) { // y is length of string to copy out just now

      //PRINT(cp, y); // Copy macro 

      if(print_back_to_string(cp, y, &n, &ret, &stream)) goto done; // Copy macro 

      ret += y; // increment return chars

    }

    if ((x <= 0) || (ret >= (int)n))  // @@@ this check with n isn't good enough

      goto done;

    fmt++;          /* skip over '%' */

    flags = 0;

    dprec = 0;

    width = 0;

    prec = -1;

    sign = '\0';

  rflag:          ch = *fmt++;

  reswitch:       switch (ch) {

    case ' ':

      /*

       * ``If the space and + flags both appear, the space

       * flag will be ignored.''

       *      -- ANSI X3J11

       */

      if (!sign)

        sign = ' ';

      goto rflag;

    case '#':

      flags |= ALT;

      goto rflag;

    case '*':

      /*

       * ``A negative field width argument is taken as a

       * - flag followed by a positive field width.''

       *      -- ANSI X3J11

       * They don't exclude field widths read from args.

       */

      if ((width = va_arg(arg, int)) >= 0)

        goto rflag;

      width = -width;

      /* FALLTHROUGH */

    case '-':

      flags |= LADJUST;

      goto rflag;

    case '+':

      sign = '+';

      goto rflag;

    case '.':

      if ((ch = *fmt++) == '*') {

        x = va_arg(arg, int);

        prec = x < 0 ? -1 : x;

        goto rflag;

      }

      x = 0;

      while (is_digit(ch)) {

        x = 10 * x + to_digit(ch);

        ch = *fmt++;

      }

      prec = x < 0 ? -1 : x;

      goto reswitch;

    case '0':

      /*

       * ``Note that 0 is taken as a flag, not as the

       * beginning of a field width.''

       *      -- ANSI X3J11

       */

      flags |= ZEROPAD;

      goto rflag;

    case '1': case '2': case '3': case '4':

    case '5': case '6': case '7': case '8': case '9':

      x = 0;

      do {

        x = 10 * x + to_digit(ch);

        ch = *fmt++;

      } while (is_digit(ch));

      width = x;

      goto reswitch;

    case 'h':

      flags |= SHORTINT;

      goto rflag;

    case 'l':

      if (*fmt == 'l') {

        fmt++;

        flags |= QUADINT;

      } else {

        flags |= LONGINT;

      }

      goto rflag;

    case 'q':

      flags |= QUADINT;

      goto rflag;

    case 'c':

      *(cp = buf) = va_arg(arg, int);

      size = 1;

      sign = '\0';

      break;

    case 'D':

      flags |= LONGINT;

      /*FALLTHROUGH*/

    case 'd':

    case 'i':

      _uquad = SARG();

#ifndef _NO_LONGLONG

      if ((quad_t)_uquad < 0)

#else

        if ((long) _uquad < 0)

#endif

          {

            _uquad = -_uquad;

            sign = '-';

          }

      base = DEC;

      goto number;

    case 'e':

    case 'E':

    case 'f':

    case 'g':

    case 'G':

      // Output nothing at all

      (void) va_arg(arg, double); // take off arg anyway

      cp = "";

      size = 0;

      sign = '\0';

      break;

    case 'n':

#ifndef _NO_LONGLONG

      if (flags & QUADINT)

        *va_arg(arg, quad_t *) = ret;

      else

#endif

        if (flags & LONGINT)

          *va_arg(arg, long *) = ret;

        else if (flags & SHORTINT)

          *va_arg(arg, short *) = ret;

        else if (flags & SIZET)

          *va_arg(arg, size_t *) = ret;

        else

          *va_arg(arg, int *) = ret;

      continue;       /* no output */

    case 'O':

      flags |= LONGINT;

      /*FALLTHROUGH*/

    case 'o':

      _uquad = UARG();

      base = OCT;

      goto nosign;

    case 'p':

      /*

       * ``The argument shall be a pointer to void.  The

       * value of the pointer is converted to a sequence

       * of printable characters, in an implementation-

       * defined manner.''

       *      -- ANSI X3J11

       */

      /* NOSTRICT */

      _uquad = (unsigned long)va_arg(arg, void *);

      base = HEX;

      xdigs = (char *)"0123456789abcdef";

      flags |= HEXPREFIX;

      ch = 'x';

      goto nosign;

    case 's':

      if ((cp = va_arg(arg, char *)) == NULL)

        cp = (char *)"(null)";

      if (prec >= 0) {

        /*

         * can't use strlen; can only look for the

         * NUL in the first `prec' characters, and

         * strlen() will go further.

         */

        char *p = (char *)memchr(cp, 0, prec);

        if (p != NULL) {

          size = p - cp;

          if (size > prec)

            size = prec;

        } else

          size = prec;

      } else

        size = strlen(cp);

      sign = '\0';

      break;

    case 'U':

      flags |= LONGINT;

      /*FALLTHROUGH*/

    case 'u':

      _uquad = UARG();

      base = DEC;

      goto nosign;

    case 'X':

      xdigs = (char *)"0123456789ABCDEF";

      goto hex;

    case 'x':

      xdigs = (char *)"0123456789abcdef";

    hex:                    _uquad = UARG();

      base = HEX;

      /* leading 0x/X only if non-zero */

      if (flags & ALT && _uquad != 0)

        flags |= HEXPREFIX;

      /* unsigned conversions */

    nosign:                 sign = '\0';

      /*

       * ``... diouXx conversions ... if a precision is

       * specified, the 0 flag will be ignored.''

       *      -- ANSI X3J11

       */

    number:                 if ((dprec = prec) >= 0)

        flags &= ~ZEROPAD;

      /*

       * ``The result of converting a zero value with an

       * explicit precision of zero is no characters.''

       *      -- ANSI X3J11

       */

      cp = buf + BUF;

      if (_uquad != 0 || prec != 0) {

        /*

         * Unsigned mod is hard, and unsigned mod

         * by a constant is easier than that by

         * a variable; hence this switch.

         */

        switch (base) {

        case OCT:

          do {

            *--cp = to_char(_uquad & 7);

            _uquad >>= 3;

          } while (_uquad);

          /* handle octal leading 0 */

          if (flags & ALT && *cp != '0')

            *--cp = '0';

          break;

        case DEC:

          if (!(flags & QUADINT)) {

            /* many numbers are 1 digit */

            unsigned long v = (unsigned long)_uquad;

            while (v >= 10) {

              /* The following is usually faster than using a modulo */

              unsigned long next = v / 10;

              *--cp = to_char(v - (next * 10));

              v = next;

            }

            *--cp = to_char(v);

          }

          else {

            while (_uquad >= 10) {

              /* The following is usually faster than using a modulo */

              u_quad_t next = _uquad / 10;

              *--cp = to_char(_uquad - (next * 10));

              _uquad = next;

            }

            *--cp = to_char(_uquad);

          }

          break;

        case HEX:

          do {

            *--cp = xdigs[_uquad & 15];

            _uquad >>= 4;

          } while (_uquad);

          break;

        default:

          cp = (char *)"bug in vfprintf: bad base";

          size = strlen(cp);

          goto skipsize;

        }

      }

      size = buf + BUF - cp;

    skipsize:

      break;

    case 'z':

      flags |= SIZET;

      goto rflag;

    default:        /* "%?" prints ?, unless ? is NUL */

      if (ch == '\0')

        goto done;

      /* pretend it was %c with argument ch */

      cp = buf;

      *cp = ch;

      size = 1;

      sign = '\0';

      break;

    }

    /*

     * All reasonable formats wind up here.  At this point, `cp'

     * points to a string which (if not flags&LADJUST) should be

     * padded out to `width' places.  If flags&ZEROPAD, it should

     * first be prefixed by any sign or other prefix; otherwise,

     * it should be blank padded before the prefix is emitted.

     * After any left-hand padding and prefixing, emit zeroes

     * required by a decimal [diouxX] precision, then print the

     * string proper, then emit zeroes required by any leftover

     * floating precision; finally, if LADJUST, pad with blanks.

     *

     * Compute actual size, so we know how much to pad.

     * fieldsz excludes decimal prec; realsz includes it.

     */

#ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT

    fieldsz = size + fpprec;

#else

    fieldsz = size;

#endif

    if (sign)

      fieldsz++;

    else if (flags & HEXPREFIX)

      fieldsz+= 2;

    realsz = dprec > fieldsz ? dprec : fieldsz;

    /* right-adjusting blank padding */

    if ((flags & (LADJUST|ZEROPAD)) == 0) {

      if (width - realsz > 0) {

        PAD(width - realsz, blanks);

        ret += width - realsz;

      }

    }

    /* prefix */

    if (sign) {

      //PRINT(&sign, 1);

      if(print_back_to_string(&sign, 1, &n, &ret, &stream))goto done;

      ret++;

    } else if (flags & HEXPREFIX) {

      ox[0] = '0';

      ox[1] = ch;

      //PRINT(ox, 2);

      if(print_back_to_string(ox, 2, &n, &ret, &stream))goto done;

      ret += 2;

    }

    /* right-adjusting zero padding */

    if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) {

      if (width - realsz > 0) {

        PAD(width - realsz, zeroes);

        ret += width - realsz;

      }

    }

    if (dprec - fieldsz > 0) {

      /* leading zeroes from decimal precision */

      PAD(dprec - fieldsz, zeroes);

      ret += dprec - fieldsz;

    }

    /* the string or number proper */

    //PRINT(cp, size);

    if(print_back_to_string(cp,size, &n, &ret, &stream))goto done;

    ret += size;

#ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT

    /* trailing f.p. zeroes */

    PAD(fpprec, zeroes);

    ret += fpprec;

#endif

    /* left-adjusting padding (always blank) */

    if (flags & LADJUST) {

      if (width - realsz > 0) {

        PAD(width - realsz, blanks);

        ret += width - realsz;

      }

    }

  }

 done:

 error:

  return ret;// remove this error stuff (((Cyg_OutputStream *) stream)->get_error() ? EOF : ret);

  /* NOTREACHED */

}

// EOF vfnprintf.c