rev: release-0.15 scopes/external/stb_sprintf.h -rw-r--r-- 43.9 KiB View raw Log this file
e53de6d7cb89 — Leonard Ritter * win32 build fix 1 year, 5 months ago
                                                                                
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// stb_sprintf - v1.02 - public domain snprintf() implementation
// originally by Jeff Roberts / RAD Game Tools, 2015/10/20
// http://github.com/nothings/stb
//
// allowed types:  sc uidBboXx p AaGgEef n
// lengths      :  h ll j z t I64 I32 I
//
// Contributors (bugfixes):
//    github:d26435
//    github:trex78
//    Jari Komppa (SI suffixes)
//
// LICENSE:
//
//   See end of file for license information.

#ifndef STB_SPRINTF_H_INCLUDE
#define STB_SPRINTF_H_INCLUDE

/*
Single file sprintf replacement.

Originally written by Jeff Roberts at RAD Game Tools - 2015/10/20.
Hereby placed in public domain.

This is a full sprintf replacement that supports everything that
the C runtime sprintfs support, including float/double, 64-bit integers,
hex floats, field parameters (%*.*d stuff), length reads backs, etc.

Why would you need this if sprintf already exists?  Well, first off,
it's *much* faster (see below). It's also much smaller than the CRT
versions code-space-wise. We've also added some simple improvements
that are super handy (commas in thousands, callbacks at buffer full,
for example). Finally, the format strings for MSVC and GCC differ
for 64-bit integers (among other small things), so this lets you use
the same format strings in cross platform code.

It uses the standard single file trick of being both the header file
and the source itself. If you just include it normally, you just get
the header file function definitions. To get the code, you include
it from a C or C++ file and define STB_SPRINTF_IMPLEMENTATION first.

It only uses va_args macros from the C runtime to do it's work. It
does cast doubles to S64s and shifts and divides U64s, which does
drag in CRT code on most platforms.

It compiles to roughly 8K with float support, and 4K without.
As a comparison, when using MSVC static libs, calling sprintf drags
in 16K.

API:
====
int stbsp_sprintf( char * buf, char const * fmt, ... )
int stbsp_snprintf( char * buf, int count, char const * fmt, ... )
  Convert an arg list into a buffer.  stbsp_snprintf always returns
  a zero-terminated string (unlike regular snprintf).

int stbsp_vsprintf( char * buf, char const * fmt, va_list va )
int stbsp_vsnprintf( char * buf, int count, char const * fmt, va_list va )
  Convert a va_list arg list into a buffer.  stbsp_vsnprintf always returns
  a zero-terminated string (unlike regular snprintf).

int stbsp_vsprintfcb( STBSP_SPRINTFCB * callback, void * user, char * buf, char const * fmt, va_list va )
    typedef char * STBSP_SPRINTFCB( char const * buf, void * user, int len );
  Convert into a buffer, calling back every STB_SPRINTF_MIN chars.
  Your callback can then copy the chars out, print them or whatever.
  This function is actually the workhorse for everything else.
  The buffer you pass in must hold at least STB_SPRINTF_MIN characters.
    // you return the next buffer to use or 0 to stop converting

void stbsp_set_separators( char comma, char period )
  Set the comma and period characters to use.

FLOATS/DOUBLES:
===============
This code uses a internal float->ascii conversion method that uses
doubles with error correction (double-doubles, for ~105 bits of
precision).  This conversion is round-trip perfect - that is, an atof
of the values output here will give you the bit-exact double back.

One difference is that our insignificant digits will be different than
with MSVC or GCC (but they don't match each other either).  We also
don't attempt to find the minimum length matching float (pre-MSVC15
doesn't either).

If you don't need float or doubles at all, define STB_SPRINTF_NOFLOAT
and you'll save 4K of code space.

64-BIT INTS:
============
This library also supports 64-bit integers and you can use MSVC style or
GCC style indicators (%I64d or %lld).  It supports the C99 specifiers
for size_t and ptr_diff_t (%jd %zd) as well.

EXTRAS:
=======
Like some GCCs, for integers and floats, you can use a ' (single quote)
specifier and commas will be inserted on the thousands: "%'d" on 12345
would print 12,345.

For integers and floats, you can use a "$" specifier and the number
will be converted to float and then divided to get kilo, mega, giga or
tera and then printed, so "%$d" 1000 is "1.0 k", "%$.2d" 2536000 is
"2.53 M", etc. For byte values, use two $:s, like "%$$d" to turn
2536000 to "2.42 Mi". If you prefer JEDEC suffixes to SI ones, use three
$:s: "%$$$d" -> "2.42 M". To remove the space between the number and the
suffix, add "_" specifier: "%_$d" -> "2.53M".

In addition to octal and hexadecimal conversions, you can print
integers in binary: "%b" for 256 would print 100.

PERFORMANCE vs MSVC 2008 32-/64-bit (GCC is even slower than MSVC):
===================================================================
"%d" across all 32-bit ints (4.8x/4.0x faster than 32-/64-bit MSVC)
"%24d" across all 32-bit ints (4.5x/4.2x faster)
"%x" across all 32-bit ints (4.5x/3.8x faster)
"%08x" across all 32-bit ints (4.3x/3.8x faster)
"%f" across e-10 to e+10 floats (7.3x/6.0x faster)
"%e" across e-10 to e+10 floats (8.1x/6.0x faster)
"%g" across e-10 to e+10 floats (10.0x/7.1x faster)
"%f" for values near e-300 (7.9x/6.5x faster)
"%f" for values near e+300 (10.0x/9.1x faster)
"%e" for values near e-300 (10.1x/7.0x faster)
"%e" for values near e+300 (9.2x/6.0x faster)
"%.320f" for values near e-300 (12.6x/11.2x faster)
"%a" for random values (8.6x/4.3x faster)
"%I64d" for 64-bits with 32-bit values (4.8x/3.4x faster)
"%I64d" for 64-bits > 32-bit values (4.9x/5.5x faster)
"%s%s%s" for 64 char strings (7.1x/7.3x faster)
"...512 char string..." ( 35.0x/32.5x faster!)
*/

#if defined(__has_feature)
 #if __has_feature(address_sanitizer)
  #define STBI__ASAN __attribute__((no_sanitize("address")))
 #endif
#endif
#ifndef STBI__ASAN
#define STBI__ASAN
#endif

#ifdef STB_SPRINTF_STATIC
#define STBSP__PUBLICDEC static
#define STBSP__PUBLICDEF static STBI__ASAN
#else
#ifdef __cplusplus
#define STBSP__PUBLICDEC extern "C"
#define STBSP__PUBLICDEF extern "C" STBI__ASAN
#else
#define STBSP__PUBLICDEC extern
#define STBSP__PUBLICDEF STBI__ASAN
#endif
#endif

#include <stdarg.h>  // for va_list()

#ifndef STB_SPRINTF_MIN
#define STB_SPRINTF_MIN 512 // how many characters per callback
#endif
typedef char * STBSP_SPRINTFCB( char * buf, void * user, int len );

#ifndef STB_SPRINTF_DECORATE
#define STB_SPRINTF_DECORATE(name) stbsp_##name  // define this before including if you want to change the names
#endif

STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( vsprintf )( char * buf, char const * fmt, va_list va );
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( vsnprintf )( char * buf, int count, char const * fmt, va_list va );
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( sprintf ) ( char * buf, char const * fmt, ... );
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( snprintf )( char * buf, int count, char const * fmt, ... );

STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( vsprintfcb )( STBSP_SPRINTFCB * callback, void * user, char * buf, char const * fmt, va_list va );
STBSP__PUBLICDEF void STB_SPRINTF_DECORATE( set_separators )( char comma, char period );

#endif // STB_SPRINTF_H_INCLUDE

#ifdef STB_SPRINTF_IMPLEMENTATION

#include <stdlib.h>  // for va_arg()

#define stbsp__uint32 unsigned int
#define stbsp__int32 signed int

#ifdef _MSC_VER
#define stbsp__uint64 unsigned __int64
#define stbsp__int64 signed __int64
#else
#define stbsp__uint64 unsigned long long
#define stbsp__int64 signed long long
#endif
#define stbsp__uint16 unsigned short

#ifndef stbsp__uintptr
#if defined(__ppc64__) || defined(__aarch64__) || defined(_M_X64) || defined(__x86_64__) || defined(__x86_64)
#define stbsp__uintptr stbsp__uint64
#else
#define stbsp__uintptr stbsp__uint32
#endif
#endif

#ifndef STB_SPRINTF_MSVC_MODE  // used for MSVC2013 and earlier (MSVC2015 matches GCC)
#if defined(_MSC_VER) && (_MSC_VER<1900)
#define STB_SPRINTF_MSVC_MODE
#endif
#endif

#ifdef STB_SPRINTF_NOUNALIGNED  // define this before inclusion to force stbsp_sprintf to always use aligned accesses
#define STBSP__UNALIGNED(code)
#else
#define STBSP__UNALIGNED(code) code
#endif

#ifndef STB_SPRINTF_NOFLOAT
// internal float utility functions
static stbsp__int32 stbsp__real_to_str( char const * * start, stbsp__uint32 * len, char *out, stbsp__int32 * decimal_pos, double value, stbsp__uint32 frac_digits );
static stbsp__int32 stbsp__real_to_parts( stbsp__int64 * bits, stbsp__int32 * expo, double value );
#define STBSP__SPECIAL 0x7000
#endif

static char stbsp__period='.';
static char stbsp__comma=',';
static char stbsp__digitpair[201]="00010203040506070809101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899";

STBSP__PUBLICDEF void STB_SPRINTF_DECORATE( set_separators )( char pcomma, char pperiod )
{
  stbsp__period=pperiod;
  stbsp__comma=pcomma;
}

#define STBSP__LEFTJUST 1
#define STBSP__LEADINGPLUS 2
#define STBSP__LEADINGSPACE 4
#define STBSP__LEADING_0X 8
#define STBSP__LEADINGZERO 16
#define STBSP__INTMAX 32
#define STBSP__TRIPLET_COMMA 64
#define STBSP__NEGATIVE 128
#define STBSP__METRIC_SUFFIX 256
#define STBSP__HALFWIDTH 512
#define STBSP__METRIC_NOSPACE 1024
#define STBSP__METRIC_1024 2048
#define STBSP__METRIC_JEDEC 4096

static void stbsp__lead_sign(stbsp__uint32 fl, char *sign)
{
  sign[0] = 0;
  if (fl&STBSP__NEGATIVE) {
    sign[0]=1;
    sign[1]='-';
  } else if (fl&STBSP__LEADINGSPACE) {
    sign[0]=1;
    sign[1]=' ';
  } else if (fl&STBSP__LEADINGPLUS) {
    sign[0]=1;
    sign[1]='+';
  }
}

STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( vsprintfcb )( STBSP_SPRINTFCB * callback, void * user, char * buf, char const * fmt, va_list va )
{
  static char hex[]="0123456789abcdefxp";
  static char hexu[]="0123456789ABCDEFXP";
  char * bf;
  char const * f;
  int tlen = 0;

  bf = buf;
  f = fmt;
  for(;;)
  {
    stbsp__int32 fw,pr,tz; stbsp__uint32 fl;

    // macros for the callback buffer stuff
    #define stbsp__chk_cb_bufL(bytes) { int len = (int)(bf-buf); if ((len+(bytes))>=STB_SPRINTF_MIN) { tlen+=len; if (0==(bf=buf=callback(buf,user,len))) goto done; } }
    #define stbsp__chk_cb_buf(bytes) { if ( callback ) { stbsp__chk_cb_bufL(bytes); } }
    #define stbsp__flush_cb() { stbsp__chk_cb_bufL(STB_SPRINTF_MIN-1); } //flush if there is even one byte in the buffer
    #define stbsp__cb_buf_clamp(cl,v) cl = v; if ( callback ) { int lg = STB_SPRINTF_MIN-(int)(bf-buf); if (cl>lg) cl=lg; }

    // fast copy everything up to the next % (or end of string)
    for(;;)
    {
      while (((stbsp__uintptr)f)&3)
      {
       schk1: if (f[0]=='%') goto scandd;
       schk2: if (f[0]==0) goto endfmt;
        stbsp__chk_cb_buf(1); *bf++=f[0]; ++f;
      }
      for(;;)
      {
        // Check if the next 4 bytes contain %(0x25) or end of string.
        // Using the 'hasless' trick:
        // https://graphics.stanford.edu/~seander/bithacks.html#HasLessInWord
        stbsp__uint32 v,c;
        v=*(stbsp__uint32*)f; c=(~v)&0x80808080;
        if (((v^0x25252525)-0x01010101)&c) goto schk1;
        if ((v-0x01010101)&c) goto schk2;
        if (callback) if ((STB_SPRINTF_MIN-(int)(bf-buf))<4) goto schk1;
        *(stbsp__uint32*)bf=v; bf+=4; f+=4;
      }
    } scandd:

    ++f;

    // ok, we have a percent, read the modifiers first
    fw = 0; pr = -1; fl = 0; tz = 0;

    // flags
    for(;;)
    {
      switch(f[0])
      {
        // if we have left justify
        case '-': fl|=STBSP__LEFTJUST; ++f; continue;
        // if we have leading plus
        case '+': fl|=STBSP__LEADINGPLUS; ++f; continue;
        // if we have leading space
        case ' ': fl|=STBSP__LEADINGSPACE; ++f; continue;
        // if we have leading 0x
        case '#': fl|=STBSP__LEADING_0X; ++f; continue;
        // if we have thousand commas
        case '\'': fl|=STBSP__TRIPLET_COMMA; ++f; continue;
        // if we have kilo marker (none->kilo->kibi->jedec)
        case '$':
            if (fl&STBSP__METRIC_SUFFIX)
            {
                if (fl&STBSP__METRIC_1024)
                {
                    fl|=STBSP__METRIC_JEDEC;
                }
                else
                {
                    fl|=STBSP__METRIC_1024;
                }
            }
            else
            {
                fl|=STBSP__METRIC_SUFFIX;
            }
            ++f; continue;
        // if we don't want space between metric suffix and number
        case '_': fl|=STBSP__METRIC_NOSPACE; ++f; continue;
        // if we have leading zero
        case '0': fl|=STBSP__LEADINGZERO; ++f; goto flags_done;
        default: goto flags_done;
      }
    }
    flags_done:

    // get the field width
    if ( f[0] == '*' ) {fw = va_arg(va,stbsp__uint32); ++f;} else { while (( f[0] >= '0' ) && ( f[0] <= '9' )) { fw = fw * 10 + f[0] - '0'; f++; } }
    // get the precision
    if ( f[0]=='.' ) { ++f; if ( f[0] == '*' ) {pr = va_arg(va,stbsp__uint32); ++f;} else { pr = 0; while (( f[0] >= '0' ) && ( f[0] <= '9' )) { pr = pr * 10 + f[0] - '0'; f++; } } }

    // handle integer size overrides
    switch(f[0])
    {
      // are we halfwidth?
      case 'h': fl|=STBSP__HALFWIDTH; ++f; break;
      // are we 64-bit (unix style)
      case 'l': ++f; if ( f[0]=='l') { fl|=STBSP__INTMAX; ++f; } break;
      // are we 64-bit on intmax? (c99)
      case 'j': fl|=STBSP__INTMAX; ++f; break;
      // are we 64-bit on size_t or ptrdiff_t? (c99)
      case 'z': case 't': fl|=((sizeof(char*)==8)?STBSP__INTMAX:0); ++f; break;
      // are we 64-bit (msft style)
      case 'I': if ( ( f[1]=='6') && ( f[2]=='4') ) { fl|=STBSP__INTMAX; f+=3; }
                else if ( ( f[1]=='3') && ( f[2]=='2') ) { f+=3; }
                else { fl|=((sizeof(void*)==8)?STBSP__INTMAX:0); ++f; } break;
      default: break;
    }

    // handle each replacement
    switch( f[0] )
    {
      #define STBSP__NUMSZ   512 // big enough for e308 (with commas) or e-307
      char num[STBSP__NUMSZ];
      char lead[8];
      char tail[8];
      char *s;
      char const *h;
      stbsp__uint32 l,n,cs;
      stbsp__uint64 n64;
      #ifndef STB_SPRINTF_NOFLOAT
      double fv;
      #endif
      stbsp__int32 dp; char const * sn;

      case 's':
        // get the string
        s = va_arg(va,char*); if (s==0) s = (char*)"null";
        // get the length
        sn = s;
        for(;;)
        {
          if ((((stbsp__uintptr)sn)&3)==0) break;
         lchk:
          if (sn[0]==0) goto ld;
          ++sn;
        }
        n = 0xffffffff;
        if (pr>=0) { n=(stbsp__uint32)(sn-s); if (n>=(stbsp__uint32)pr) goto ld; n=((stbsp__uint32)(pr-n))>>2; }
        while(n)
        {
          stbsp__uint32 v=*(stbsp__uint32*)sn;
          if ((v-0x01010101)&(~v)&0x80808080UL) goto lchk;
          sn+=4;
          --n;
        }
        goto lchk;
       ld:

        l = (stbsp__uint32) ( sn - s );
        // clamp to precision
        if ( l > (stbsp__uint32)pr ) l = pr;
        lead[0]=0; tail[0]=0; pr = 0; dp = 0; cs = 0;
        // copy the string in
        goto scopy;

      case 'c': // char
        // get the character
        s = num + STBSP__NUMSZ -1; *s = (char)va_arg(va,int);
        l = 1;
        lead[0]=0; tail[0]=0; pr = 0; dp = 0; cs = 0;
        goto scopy;

      case 'n': // weird write-bytes specifier
        { int * d = va_arg(va,int*);
        *d = tlen + (int)( bf - buf ); }
        break;

#ifdef STB_SPRINTF_NOFLOAT
      case 'A': // float
      case 'a': // hex float
      case 'G': // float
      case 'g': // float
      case 'E': // float
      case 'e': // float
      case 'f': // float
        va_arg(va,double); // eat it
        s = (char*)"No float";
        l = 8;
        lead[0]=0; tail[0]=0; pr = 0; dp = 0; cs = 0;
        goto scopy;
#else
      case 'A': // float
        h=hexu;
        goto hexfloat;

      case 'a': // hex float
        h=hex;
       hexfloat:
        fv = va_arg(va,double);
        if (pr==-1) pr=6; // default is 6
        // read the double into a string
        if ( stbsp__real_to_parts( (stbsp__int64*)&n64, &dp, fv ) )
          fl |= STBSP__NEGATIVE;

        s = num+64;

        stbsp__lead_sign(fl, lead);

        if (dp==-1023) dp=(n64)?-1022:0; else n64|=(((stbsp__uint64)1)<<52);
        n64<<=(64-56);
        if (pr<15) n64+=((((stbsp__uint64)8)<<56)>>(pr*4));
        // add leading chars

        #ifdef STB_SPRINTF_MSVC_MODE
        *s++='0';*s++='x';
        #else
        lead[1+lead[0]]='0'; lead[2+lead[0]]='x'; lead[0]+=2;
        #endif
        *s++=h[(n64>>60)&15]; n64<<=4;
        if ( pr ) *s++=stbsp__period;
        sn = s;

        // print the bits
        n = pr; if (n>13) n = 13; if (pr>(stbsp__int32)n) tz=pr-n; pr = 0;
        while(n--) { *s++=h[(n64>>60)&15]; n64<<=4; }

        // print the expo
        tail[1]=h[17];
        if (dp<0) { tail[2]='-'; dp=-dp;} else tail[2]='+';
        n = (dp>=1000)?6:((dp>=100)?5:((dp>=10)?4:3));
        tail[0]=(char)n;
        for(;;) { tail[n]='0'+dp%10; if (n<=3) break; --n; dp/=10; }

        dp = (int)(s-sn);
        l = (int)(s-(num+64));
        s = num+64;
        cs = 1 + (3<<24);
        goto scopy;

      case 'G': // float
        h=hexu;
        goto dosmallfloat;

      case 'g': // float
        h=hex;
       dosmallfloat:
        fv = va_arg(va,double);
        if (pr==-1) pr=6; else if (pr==0) pr = 1; // default is 6
        // read the double into a string
        if ( stbsp__real_to_str( &sn, &l, num, &dp, fv, (pr-1)|0x80000000 ) )
          fl |= STBSP__NEGATIVE;

        n = pr;

        // should we use %e
        if ((dp<=-4)||(dp>(stbsp__int32)n))
        {
          // clamp the precision and delete extra zeros after clamp
          if ( l > (stbsp__uint32)pr ) l = pr; while ((l>1)&&(pr)&&(sn[l-1]=='0')) { --pr; --l; }
          if ( pr > (stbsp__int32)l ) pr = l-1; else if ( pr ) --pr; // when using %e, there is one digit before the decimal
          goto doexpfromg;
        } else {
          if (*sn == '0') dp--; // (lritter) for a zero, insert a trailing 0.
          unsigned int minl = (dp > 0)?(dp+1):1; // (lritter) keep at least one zero after the dot
          // clamp the precision and delete extra zeros after clamp
          if ( l > (stbsp__uint32)pr ) l = pr; while ((l>minl)&&(pr)&&(sn[l-1]=='0')) { --pr; --l; }
        }
        // this is the insane action to get the pr to match %g sematics for %f
        if(dp>0) { pr=(dp<(stbsp__int32)l)?l-dp:0; } else { pr = -dp+((pr>(stbsp__int32)l)?l:pr); }
        goto dofloatfromg;

      case 'E': // float
        h=hexu;
        goto doexp;

      case 'e': // float
        h=hex;
       doexp:
        fv = va_arg(va,double);
        if (pr==-1) pr=6; // default is 6
        // read the double into a string
        if ( stbsp__real_to_str( &sn, &l, num, &dp, fv, pr|0x80000000 ) )
          fl |= STBSP__NEGATIVE;
       doexpfromg:
        tail[0]=0;
        stbsp__lead_sign(fl, lead);
        if ( dp == STBSP__SPECIAL ) { s=(char*)sn; cs=0; pr=0; goto scopy; }
        s=num+64;
        // handle leading chars
        *s++=sn[0];

        if (pr) *s++=stbsp__period;

        // handle after decimal
        if ((l-1)>(stbsp__uint32)pr) l=pr+1;
        for(n=1;n<l;n++) *s++=sn[n];
        // trailing zeros
        tz = pr-(l-1); pr=0;
        // dump expo
        tail[1]=h[0xe];
        dp -= 1;
        if (dp<0) { tail[2]='-'; dp=-dp;} else tail[2]='+';
        #ifdef STB_SPRINTF_MSVC_MODE
        n = 5;
        #else
        n = (dp>=100)?5:4;
        #endif
        tail[0]=(char)n;
        for(;;) { tail[n]='0'+dp%10; if (n<=3) break; --n; dp/=10; }
        cs = 1 + (3<<24); // how many tens
        goto flt_lead;

      case 'f': // float
        fv = va_arg(va,double);
       doafloat:
        // do kilos
        if (fl&STBSP__METRIC_SUFFIX)
        {
            double divisor;
            divisor=1000.0f;
            if (fl&STBSP__METRIC_1024) divisor = 1024.0;
            while(fl<0x4000000) { if ((fv<divisor) && (fv>-divisor)) break; fv/=divisor; fl+=0x1000000; }
        }
        if (pr==-1) pr=6; // default is 6
        // read the double into a string
        if ( stbsp__real_to_str( &sn, &l, num, &dp, fv, pr ) )
          fl |= STBSP__NEGATIVE;
        dofloatfromg:
        tail[0]=0;
        stbsp__lead_sign(fl, lead);
        if ( dp == STBSP__SPECIAL ) { s=(char*)sn; cs=0; pr=0; goto scopy; }
        s=num+64;

        // handle the three decimal varieties
        if (dp<=0)
        {
          stbsp__int32 i;
          // handle 0.000*000xxxx
          *s++='0'; if (pr) *s++=stbsp__period;
          n=-dp; if((stbsp__int32)n>pr) n=pr; i=n; while(i) { if ((((stbsp__uintptr)s)&3)==0) break; *s++='0'; --i; } while(i>=4) { *(stbsp__uint32*)s=0x30303030; s+=4; i-=4; } while(i) { *s++='0'; --i; }
          if ((stbsp__int32)(l+n)>pr) l=pr-n; i=l; while(i) { *s++=*sn++; --i; }
          tz = pr-(n+l);
          cs = 1 + (3<<24); // how many tens did we write (for commas below)
        }
        else
        {
          cs = (fl&STBSP__TRIPLET_COMMA)?((600-(stbsp__uint32)dp)%3):0;
          if ((stbsp__uint32)dp>=l)
          {
            // handle xxxx000*000.0
            n=0; for(;;) { if ((fl&STBSP__TRIPLET_COMMA) && (++cs==4)) { cs = 0; *s++=stbsp__comma; } else { *s++=sn[n]; ++n; if (n>=l) break; } }
            if (n<(stbsp__uint32)dp)
            {
              n = dp - n;
              if ((fl&STBSP__TRIPLET_COMMA)==0) { while(n) { if ((((stbsp__uintptr)s)&3)==0) break; *s++='0'; --n; }  while(n>=4) { *(stbsp__uint32*)s=0x30303030; s+=4; n-=4; } }
              while(n) { if ((fl&STBSP__TRIPLET_COMMA) && (++cs==4)) { cs = 0; *s++=stbsp__comma; } else { *s++='0'; --n; } }
            }
            cs = (int)(s-(num+64)) + (3<<24); // cs is how many tens
            if (pr) { *s++=stbsp__period; tz=pr;}
          }
          else
          {
            // handle xxxxx.xxxx000*000
            n=0; for(;;) { if ((fl&STBSP__TRIPLET_COMMA) && (++cs==4)) { cs = 0; *s++=stbsp__comma; } else { *s++=sn[n]; ++n; if (n>=(stbsp__uint32)dp) break; } }
            cs = (int)(s-(num+64)) + (3<<24); // cs is how many tens
            if (pr) *s++=stbsp__period;
            if ((l-dp)>(stbsp__uint32)pr) l=pr+dp;
            while(n<l) { *s++=sn[n]; ++n; }
            tz = pr-(l-dp);
          }
        }
        pr = 0;

        // handle k,m,g,t
        if (fl&STBSP__METRIC_SUFFIX)
        {
            char idx;
            idx=1;
            if (fl&STBSP__METRIC_NOSPACE)
                idx=0;
            tail[0]=idx;
            tail[1]=' ';
            {
                if (fl>>24)
                {   // SI kilo is 'k', JEDEC and SI kibits are 'K'.
                    if (fl&STBSP__METRIC_1024)
                        tail[idx+1]="_KMGT"[fl>>24];
                    else
                        tail[idx+1]="_kMGT"[fl>>24];
                    idx++;
                    // If printing kibits and not in jedec, add the 'i'.
                    if (fl&STBSP__METRIC_1024&&!(fl&STBSP__METRIC_JEDEC))
                    {
                        tail[idx+1]='i';
                        idx++;
                    }
                    tail[0]=idx;
                }
            }
        };

        flt_lead:
        // get the length that we copied
        l = (stbsp__uint32) ( s-(num+64) );
        s=num+64;
        goto scopy;
#endif

      case 'B': // upper binary
        h = hexu;
        goto binary;

      case 'b': // lower binary
        h = hex;
        binary:
        lead[0]=0;
        if (fl&STBSP__LEADING_0X) { lead[0]=2;lead[1]='0';lead[2]=h[0xb]; }
        l=(8<<4)|(1<<8);
        goto radixnum;

      case 'o': // octal
        h = hexu;
        lead[0]=0;
        if (fl&STBSP__LEADING_0X) { lead[0]=1;lead[1]='0'; }
        l=(3<<4)|(3<<8);
        goto radixnum;

      case 'p': // pointer
        fl |= (sizeof(void*)==8)?STBSP__INTMAX:0;
        pr = sizeof(void*)*2;
        fl &= ~STBSP__LEADINGZERO; // 'p' only prints the pointer with zeros
        // drop through to X

      case 'X': // upper binary
        h = hexu;
        goto dohexb;

      case 'x': // lower binary
        h = hex; dohexb:
        l=(4<<4)|(4<<8);
        lead[0]=0;
        if (fl&STBSP__LEADING_0X) { lead[0]=2;lead[1]='0';lead[2]=h[16]; }
       radixnum:
        // get the number
        if ( fl&STBSP__INTMAX )
          n64 = va_arg(va,stbsp__uint64);
        else
          n64 = va_arg(va,stbsp__uint32);

        s = num + STBSP__NUMSZ; dp = 0;
        // clear tail, and clear leading if value is zero
        tail[0]=0; if (n64==0) { lead[0]=0; if (pr==0) { l=0; cs = ( ((l>>4)&15)) << 24; goto scopy; } }
        // convert to string
        for(;;) { *--s = h[n64&((1<<(l>>8))-1)]; n64>>=(l>>8); if ( ! ( (n64) || ((stbsp__int32) ( (num+STBSP__NUMSZ) - s ) < pr ) ) ) break; if ( fl&STBSP__TRIPLET_COMMA) { ++l; if ((l&15)==((l>>4)&15)) { l&=~15; *--s=stbsp__comma; } } };
        // get the tens and the comma pos
        cs = (stbsp__uint32) ( (num+STBSP__NUMSZ) - s ) + ( ( ((l>>4)&15)) << 24 );
        // get the length that we copied
        l = (stbsp__uint32) ( (num+STBSP__NUMSZ) - s );
        // copy it
        goto scopy;

      case 'u': // unsigned
      case 'i':
      case 'd': // integer
        // get the integer and abs it
        if ( fl&STBSP__INTMAX )
        {
          stbsp__int64 i64 = va_arg(va,stbsp__int64); n64 = (stbsp__uint64)i64; if ((f[0]!='u') && (i64<0)) { n64=(stbsp__uint64)-i64; fl|=STBSP__NEGATIVE; }
        }
        else
        {
          stbsp__int32 i = va_arg(va,stbsp__int32); n64 = (stbsp__uint32)i; if ((f[0]!='u') && (i<0)) { n64=(stbsp__uint32)-i; fl|=STBSP__NEGATIVE; }
        }

        #ifndef STB_SPRINTF_NOFLOAT
        if (fl&STBSP__METRIC_SUFFIX) { if (n64<1024) pr=0; else if (pr==-1) pr=1; fv=(double)(stbsp__int64)n64; goto doafloat; }
        #endif

        // convert to string
        s = num+STBSP__NUMSZ; l=0;

        for(;;)
        {
          // do in 32-bit chunks (avoid lots of 64-bit divides even with constant denominators)
          char * o=s-8;
          if (n64>=100000000) { n = (stbsp__uint32)( n64 % 100000000);  n64 /= 100000000; } else {n = (stbsp__uint32)n64; n64 = 0; }
          if((fl&STBSP__TRIPLET_COMMA)==0) { while(n) { s-=2; *(stbsp__uint16*)s=*(stbsp__uint16*)&stbsp__digitpair[(n%100)*2]; n/=100; } }
          while (n) { if ( ( fl&STBSP__TRIPLET_COMMA) && (l++==3) ) { l=0; *--s=stbsp__comma; --o; } else { *--s=(char)(n%10)+'0'; n/=10; } }
          if (n64==0) { if ((s[0]=='0') && (s!=(num+STBSP__NUMSZ))) ++s; break; }
          while (s!=o) if ( ( fl&STBSP__TRIPLET_COMMA) && (l++==3) ) { l=0; *--s=stbsp__comma; --o; } else { *--s='0'; }
        }

        tail[0]=0;
        stbsp__lead_sign(fl, lead);

        // get the length that we copied
        l = (stbsp__uint32) ( (num+STBSP__NUMSZ) - s ); if ( l == 0 ) { *--s='0'; l = 1; }
        cs = l + (3<<24);
        if (pr<0) pr = 0;

       scopy:
        // get fw=leading/trailing space, pr=leading zeros
        if (pr<(stbsp__int32)l) pr = l;
        n = pr + lead[0] + tail[0] + tz;
        if (fw<(stbsp__int32)n) fw = n;
        fw -= n;
        pr -= l;

        // handle right justify and leading zeros
        if ( (fl&STBSP__LEFTJUST)==0 )
        {
          if (fl&STBSP__LEADINGZERO) // if leading zeros, everything is in pr
          {
            pr = (fw>pr)?fw:pr;
            fw = 0;
          }
          else
          {
            fl &= ~STBSP__TRIPLET_COMMA; // if no leading zeros, then no commas
          }
        }

        // copy the spaces and/or zeros
        if (fw+pr)
        {
          stbsp__int32 i; stbsp__uint32 c;

          // copy leading spaces (or when doing %8.4d stuff)
          if ( (fl&STBSP__LEFTJUST)==0 ) while(fw>0) { stbsp__cb_buf_clamp(i,fw); fw -= i; while(i) { if ((((stbsp__uintptr)bf)&3)==0) break; *bf++=' '; --i; } while(i>=4) { *(stbsp__uint32*)bf=0x20202020; bf+=4; i-=4; } while (i) {*bf++=' '; --i;} stbsp__chk_cb_buf(1); }

          // copy leader
          sn=lead+1; while(lead[0]) { stbsp__cb_buf_clamp(i,lead[0]); lead[0] -= (char)i; while (i) {*bf++=*sn++; --i;} stbsp__chk_cb_buf(1); }

          // copy leading zeros
          c = cs >> 24; cs &= 0xffffff;
          cs = (fl&STBSP__TRIPLET_COMMA)?((stbsp__uint32)(c-((pr+cs)%(c+1)))):0;
          while(pr>0) { stbsp__cb_buf_clamp(i,pr); pr -= i; if((fl&STBSP__TRIPLET_COMMA)==0) { while(i) { if ((((stbsp__uintptr)bf)&3)==0) break; *bf++='0'; --i; } while(i>=4) { *(stbsp__uint32*)bf=0x30303030; bf+=4; i-=4; } } while (i) { if((fl&STBSP__TRIPLET_COMMA) && (cs++==c)) { cs = 0; *bf++=stbsp__comma; } else *bf++='0'; --i; } stbsp__chk_cb_buf(1); }
        }

        // copy leader if there is still one
        sn=lead+1; while(lead[0]) { stbsp__int32 i; stbsp__cb_buf_clamp(i,lead[0]); lead[0] -= (char)i; while (i) {*bf++=*sn++; --i;} stbsp__chk_cb_buf(1); }

        // copy the string
        n = l; while (n) { stbsp__int32 i; stbsp__cb_buf_clamp(i,n); n-=i; STBSP__UNALIGNED( while(i>=4) { *(stbsp__uint32*)bf=*(stbsp__uint32*)s; bf+=4; s+=4; i-=4; } ) while (i) {*bf++=*s++; --i;} stbsp__chk_cb_buf(1); }

        // copy trailing zeros
        while(tz) { stbsp__int32 i; stbsp__cb_buf_clamp(i,tz); tz -= i; while(i) { if ((((stbsp__uintptr)bf)&3)==0) break; *bf++='0'; --i; } while(i>=4) { *(stbsp__uint32*)bf=0x30303030; bf+=4; i-=4; } while (i) {*bf++='0'; --i;} stbsp__chk_cb_buf(1); }

        // copy tail if there is one
        sn=tail+1; while(tail[0]) { stbsp__int32 i; stbsp__cb_buf_clamp(i,tail[0]); tail[0] -= (char)i; while (i) {*bf++=*sn++; --i;} stbsp__chk_cb_buf(1); }

        // handle the left justify
        if (fl&STBSP__LEFTJUST) if (fw>0) { while (fw) { stbsp__int32 i; stbsp__cb_buf_clamp(i,fw); fw-=i; while(i) { if ((((stbsp__uintptr)bf)&3)==0) break; *bf++=' '; --i; } while(i>=4) { *(stbsp__uint32*)bf=0x20202020; bf+=4; i-=4; } while (i--) *bf++=' '; stbsp__chk_cb_buf(1); } }
        break;

      default: // unknown, just copy code
        s = num + STBSP__NUMSZ -1; *s = f[0];
        l = 1;
        fw=pr=fl=0;
        lead[0]=0; tail[0]=0; pr = 0; dp = 0; cs = 0;
        goto scopy;
    }
    ++f;
  }
 endfmt:

  if (!callback)
    *bf = 0;
  else
    stbsp__flush_cb();

 done:
  return tlen + (int)(bf-buf);
}

// cleanup
#undef STBSP__LEFTJUST
#undef STBSP__LEADINGPLUS
#undef STBSP__LEADINGSPACE
#undef STBSP__LEADING_0X
#undef STBSP__LEADINGZERO
#undef STBSP__INTMAX
#undef STBSP__TRIPLET_COMMA
#undef STBSP__NEGATIVE
#undef STBSP__METRIC_SUFFIX
#undef STBSP__NUMSZ
#undef stbsp__chk_cb_bufL
#undef stbsp__chk_cb_buf
#undef stbsp__flush_cb
#undef stbsp__cb_buf_clamp

// ============================================================================
//   wrapper functions

STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( sprintf )( char * buf, char const * fmt, ... )
{
  int result;
  va_list va;
  va_start( va, fmt );
  result = STB_SPRINTF_DECORATE( vsprintfcb )( 0, 0, buf, fmt, va );
  va_end(va);
  return result;
}

typedef struct stbsp__context
{
  char * buf;
  int count;
  char tmp[ STB_SPRINTF_MIN ];
} stbsp__context;

static char * stbsp__clamp_callback( char * buf, void * user, int len )
{
  stbsp__context * c = (stbsp__context*)user;

  if ( len > c->count ) len = c->count;

  if (len)
  {
    if ( buf != c->buf )
    {
      char * s, * d, * se;
      d = c->buf; s = buf; se = buf+len;
      do{ *d++ = *s++; } while (s<se);
    }
    c->buf += len;
    c->count -= len;
  }

  if ( c->count <= 0 ) return 0;
  return ( c->count >= STB_SPRINTF_MIN ) ? c->buf : c->tmp; // go direct into buffer if you can
}

static char * stbsp__count_clamp_callback( char * buf, void * user, int len )
{
  stbsp__context * c = (stbsp__context*)user;

  c->count += len;
  return c->tmp; // go direct into buffer if you can
}

STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( vsnprintf )( char * buf, int count, char const * fmt, va_list va )
{
  stbsp__context c;
  int l;

  // (lritter) support querying length without providing a buffer
  if ( (count == 0) && !buf )
  {
    c.count = 0;

    STB_SPRINTF_DECORATE( vsprintfcb )( stbsp__count_clamp_callback, &c, c.tmp, fmt, va );
    l = c.count;
  }
  else
  {
    if ( count == 0 )
      return 0;

    c.buf = buf;
    c.count = count;

    STB_SPRINTF_DECORATE( vsprintfcb )( stbsp__clamp_callback, &c, stbsp__clamp_callback(0,&c,0), fmt, va );

    // zero-terminate
    l = (int)( c.buf - buf );
    if ( l >= count ) // should never be greater, only equal (or less) than count
      l = count - 1;
    buf[l] = 0;
  }

  return l;
}

STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( snprintf )( char * buf, int count, char const * fmt, ... )
{
  int result;
  va_list va;
  va_start( va, fmt );

  result = STB_SPRINTF_DECORATE( vsnprintf )( buf, count, fmt, va );
  va_end(va);

  return result;
}

STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( vsprintf )( char * buf, char const * fmt, va_list va )
{
  return STB_SPRINTF_DECORATE( vsprintfcb )( 0, 0, buf, fmt, va );
}

// =======================================================================
//   low level float utility functions

#ifndef STB_SPRINTF_NOFLOAT

// copies d to bits w/ strict aliasing (this compiles to nothing on /Ox)
#define STBSP__COPYFP(dest,src) { int cn; for(cn=0;cn<8;cn++) ((char*)&dest)[cn]=((char*)&src)[cn]; }

// get float info
static stbsp__int32 stbsp__real_to_parts( stbsp__int64 * bits, stbsp__int32 * expo, double value )
{
  double d;
  stbsp__int64 b = 0;

  // load value and round at the frac_digits
  d = value;

  STBSP__COPYFP( b, d );

  *bits = b & ((((stbsp__uint64)1)<<52)-1);
  *expo = (stbsp__int32) (((b >> 52) & 2047)-1023);

  return (stbsp__int32)(b >> 63);
}

static double const stbsp__bot[23]={1e+000,1e+001,1e+002,1e+003,1e+004,1e+005,1e+006,1e+007,1e+008,1e+009,1e+010,1e+011,1e+012,1e+013,1e+014,1e+015,1e+016,1e+017,1e+018,1e+019,1e+020,1e+021,1e+022};
static double const stbsp__negbot[22]={1e-001,1e-002,1e-003,1e-004,1e-005,1e-006,1e-007,1e-008,1e-009,1e-010,1e-011,1e-012,1e-013,1e-014,1e-015,1e-016,1e-017,1e-018,1e-019,1e-020,1e-021,1e-022};
static double const stbsp__negboterr[22]={-5.551115123125783e-018,-2.0816681711721684e-019,-2.0816681711721686e-020,-4.7921736023859299e-021,-8.1803053914031305e-022,4.5251888174113741e-023,4.5251888174113739e-024,-2.0922560830128471e-025,-6.2281591457779853e-026,-3.6432197315497743e-027,6.0503030718060191e-028,2.0113352370744385e-029,-3.0373745563400371e-030,1.1806906454401013e-032,-7.7705399876661076e-032,2.0902213275965398e-033,-7.1542424054621921e-034,-7.1542424054621926e-035,2.4754073164739869e-036,5.4846728545790429e-037,9.2462547772103625e-038,-4.8596774326570872e-039};
static double const stbsp__top[13]={1e+023,1e+046,1e+069,1e+092,1e+115,1e+138,1e+161,1e+184,1e+207,1e+230,1e+253,1e+276,1e+299};
static double const stbsp__negtop[13]={1e-023,1e-046,1e-069,1e-092,1e-115,1e-138,1e-161,1e-184,1e-207,1e-230,1e-253,1e-276,1e-299};
static double const stbsp__toperr[13]={8388608,6.8601809640529717e+028,-7.253143638152921e+052,-4.3377296974619174e+075,-1.5559416129466825e+098,-3.2841562489204913e+121,-3.7745893248228135e+144,-1.7356668416969134e+167,-3.8893577551088374e+190,-9.9566444326005119e+213,6.3641293062232429e+236,-5.2069140800249813e+259,-5.2504760255204387e+282};
static double const stbsp__negtoperr[13]={3.9565301985100693e-040,-2.299904345391321e-063,3.6506201437945798e-086,1.1875228833981544e-109,-5.0644902316928607e-132,-6.7156837247865426e-155,-2.812077463003139e-178,-5.7778912386589953e-201,7.4997100559334532e-224,-4.6439668915134491e-247,-6.3691100762962136e-270,-9.436808465446358e-293,8.0970921678014997e-317};

#if defined(_MSC_VER) && (_MSC_VER<=1200)
static stbsp__uint64 const stbsp__powten[20]={1,10,100,1000, 10000,100000,1000000,10000000, 100000000,1000000000,10000000000,100000000000,  1000000000000,10000000000000,100000000000000,1000000000000000,  10000000000000000,100000000000000000,1000000000000000000,10000000000000000000U };
#define stbsp__tento19th ((stbsp__uint64)1000000000000000000)
#else
static stbsp__uint64 const stbsp__powten[20]={1,10,100,1000, 10000,100000,1000000,10000000, 100000000,1000000000,10000000000ULL,100000000000ULL,  1000000000000ULL,10000000000000ULL,100000000000000ULL,1000000000000000ULL,  10000000000000000ULL,100000000000000000ULL,1000000000000000000ULL,10000000000000000000ULL };
#define stbsp__tento19th (1000000000000000000ULL)
#endif

#define stbsp__ddmulthi(oh,ol,xh,yh) \
{ \
  double ahi=0,alo,bhi=0,blo; \
  stbsp__int64 bt; \
  oh = xh * yh; \
  STBSP__COPYFP(bt,xh); bt&=((~(stbsp__uint64)0)<<27); STBSP__COPYFP(ahi,bt); alo = xh-ahi; \
  STBSP__COPYFP(bt,yh); bt&=((~(stbsp__uint64)0)<<27); STBSP__COPYFP(bhi,bt); blo = yh-bhi; \
  ol = ((ahi*bhi-oh)+ahi*blo+alo*bhi)+alo*blo; \
}

#define stbsp__ddtoS64(ob,xh,xl) \
{ \
  double ahi=0,alo,vh,t;\
  ob = (stbsp__int64)ph;\
  vh=(double)ob;\
  ahi = ( xh - vh );\
  t = ( ahi - xh );\
  alo = (xh-(ahi-t))-(vh+t);\
  ob += (stbsp__int64)(ahi+alo+xl);\
}


#define stbsp__ddrenorm(oh,ol) { double s; s=oh+ol; ol=ol-(s-oh); oh=s; }

#define stbsp__ddmultlo(oh,ol,xh,xl,yh,yl) \
  ol = ol + ( xh*yl + xl*yh ); \

#define stbsp__ddmultlos(oh,ol,xh,yl) \
  ol = ol + ( xh*yl ); \

static void stbsp__raise_to_power10( double *ohi, double *olo, double d, stbsp__int32 power )  // power can be -323 to +350
{
  double ph, pl;
  if ((power>=0) && (power<=22))
  {
    stbsp__ddmulthi(ph,pl,d,stbsp__bot[power]);
  }
  else
  {
    stbsp__int32 e,et,eb;
    double p2h,p2l;

    e=power; if (power<0) e=-e;
    et = (e*0x2c9)>>14;/* %23 */ if (et>13) et=13; eb = e-(et*23);

    ph = d; pl = 0.0;
    if (power<0)
    {
      if (eb) { --eb; stbsp__ddmulthi(ph,pl,d,stbsp__negbot[eb]); stbsp__ddmultlos(ph,pl,d,stbsp__negboterr[eb]); }
      if (et)
      {
        stbsp__ddrenorm(ph,pl);
        --et; stbsp__ddmulthi(p2h,p2l,ph,stbsp__negtop[et]); stbsp__ddmultlo(p2h,p2l,ph,pl,stbsp__negtop[et],stbsp__negtoperr[et]); ph=p2h;pl=p2l;
      }
    }
    else
    {
      if (eb)
      {
        e = eb; if (eb>22) eb=22; e -= eb;
        stbsp__ddmulthi(ph,pl,d,stbsp__bot[eb]);
        if ( e ) { stbsp__ddrenorm(ph,pl); stbsp__ddmulthi(p2h,p2l,ph,stbsp__bot[e]); stbsp__ddmultlos(p2h,p2l,stbsp__bot[e],pl); ph=p2h;pl=p2l; }
      }
      if (et)
      {
        stbsp__ddrenorm(ph,pl);
        --et; stbsp__ddmulthi(p2h,p2l,ph,stbsp__top[et]); stbsp__ddmultlo(p2h,p2l,ph,pl,stbsp__top[et],stbsp__toperr[et]); ph=p2h;pl=p2l;
      }
    }
  }
  stbsp__ddrenorm(ph,pl);
  *ohi = ph; *olo = pl;
}

// given a float value, returns the significant bits in bits, and the position of the
//   decimal point in decimal_pos.  +/-INF and NAN are specified by special values
//   returned in the decimal_pos parameter.
// frac_digits is absolute normally, but if you want from first significant digits (got %g and %e), or in 0x80000000
static stbsp__int32 stbsp__real_to_str( char const * * start, stbsp__uint32 * len, char *out, stbsp__int32 * decimal_pos, double value, stbsp__uint32 frac_digits )
{
  double d;
  stbsp__int64 bits = 0;
  stbsp__int32 expo, e, ng, tens;

  d = value;
  STBSP__COPYFP(bits,d);
  expo = (stbsp__int32) ((bits >> 52) & 2047);
  ng = (stbsp__int32)(bits >> 63);
  if (ng) d=-d;

  if ( expo == 2047 ) // is nan or inf?
  {
    *start = (bits&((((stbsp__uint64)1)<<52)-1)) ? "NaN" : "Inf";
    *decimal_pos =  STBSP__SPECIAL;
    *len = 3;
    return ng;
  }

  if ( expo == 0 ) // is zero or denormal
  {
    if ((bits<<1)==0) // do zero
    {
      *decimal_pos = 1;
      *start = out;
      out[0] = '0'; *len = 1;
      return ng;
    }
    // find the right expo for denormals
    {
      stbsp__int64 v = ((stbsp__uint64)1)<<51;
      while ((bits&v)==0) { --expo; v >>= 1; }
    }
  }

  // find the decimal exponent as well as the decimal bits of the value
  {
    double ph,pl;

    // log10 estimate - very specifically tweaked to hit or undershoot by no more than 1 of log10 of all expos 1..2046
    tens=expo-1023; tens = (tens<0)?((tens*617)/2048):(((tens*1233)/4096)+1);

    // move the significant bits into position and stick them into an int
    stbsp__raise_to_power10( &ph, &pl, d, 18-tens );

    // get full as much precision from double-double as possible
    stbsp__ddtoS64( bits, ph,pl );

    // check if we undershot
    if ( ((stbsp__uint64)bits) >= stbsp__tento19th ) ++tens;
  }

  // now do the rounding in integer land
  frac_digits = ( frac_digits & 0x80000000 ) ? ( (frac_digits&0x7ffffff) + 1 ) : ( tens + frac_digits );
  if ( ( frac_digits < 24 ) )
  {
    stbsp__uint32 dg = 1; if ((stbsp__uint64)bits >= stbsp__powten[9] ) dg=10; while( (stbsp__uint64)bits >= stbsp__powten[dg] ) { ++dg; if (dg==20) goto noround; }
    if ( frac_digits < dg )
    {
      stbsp__uint64 r;
      // add 0.5 at the right position and round
      e = dg - frac_digits;
      if ( (stbsp__uint32)e >= 24 ) goto noround;
      r = stbsp__powten[e];
      bits = bits + (r/2);
      if ( (stbsp__uint64)bits >= stbsp__powten[dg] ) ++tens;
      bits /= r;
    }
    noround:;
  }

  // kill long trailing runs of zeros
  if ( bits )
  {
    stbsp__uint32 n;
    for(;;) { if ( bits<=0xffffffff ) break; if (bits%1000) goto donez; bits/=1000; }
    n = (stbsp__uint32)bits;
    while ((n%1000)==0) n/=1000;
    bits=n;
    donez:;
  }

  // convert to string
  out += 64;
  e = 0;
  for(;;)
  {
    stbsp__uint32 n;
    char * o = out-8;
    // do the conversion in chunks of U32s (avoid most 64-bit divides, worth it, constant denomiators be damned)
    if (bits>=100000000) { n = (stbsp__uint32)( bits % 100000000);  bits /= 100000000; } else {n = (stbsp__uint32)bits; bits = 0; }
    while(n) { out-=2; *(stbsp__uint16*)out=*(stbsp__uint16*)&stbsp__digitpair[(n%100)*2]; n/=100; e+=2; }
    if (bits==0) { if ((e) && (out[0]=='0')) { ++out; --e; } break; }
    while( out!=o ) { *--out ='0'; ++e; }
  }

  *decimal_pos = tens;
  *start = out;
  *len = e;
  return ng;
}

#undef stbsp__ddmulthi
#undef stbsp__ddrenorm
#undef stbsp__ddmultlo
#undef stbsp__ddmultlos
#undef STBSP__SPECIAL
#undef STBSP__COPYFP

#endif // STB_SPRINTF_NOFLOAT

// clean up
#undef stbsp__uint16
#undef stbsp__uint32
#undef stbsp__int32
#undef stbsp__uint64
#undef stbsp__int64
#undef STBSP__UNALIGNED

#endif // STB_SPRINTF_IMPLEMENTATION


/*
------------------------------------------------------------------------------
This software is available under 2 licenses -- choose whichever you prefer.
------------------------------------------------------------------------------
ALTERNATIVE A - MIT License
Copyright (c) 2017 Sean Barrett
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
------------------------------------------------------------------------------
ALTERNATIVE B - Public Domain (www.unlicense.org)
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
software, either in source code form or as a compiled binary, for any purpose,
commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of this
software dedicate any and all copyright interest in the software to the public
domain. We make this dedication for the benefit of the public at large and to
the detriment of our heirs and successors. We intend this dedication to be an
overt act of relinquishment in perpetuity of all present and future rights to
this software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
------------------------------------------------------------------------------
*/