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sfvprintf.c

#include    "sfhdr.h"

/*    The engine for formatting data
**
**    Written by Kiem-Phong Vo (06/27/90)
*/

#define HIGHBITI  (~((~((uint)0)) >> 1))
#define HIGHBITL  (~((~((Sfulong_t)0)) >> 1))

#define SFFMT_PREFIX    (SFFMT_MINUS|SFFMT_SIGN|SFFMT_BLANK)

#define FPRECIS         6     /* default precision for floats     */


#if __STD_C
int sfvprintf(Sfio_t* f, const char* form, va_list args)
#else
int sfvprintf(f,form,args)
Sfio_t*     f;          /* file to print to     */
char* form;       /* format to use  */
va_list     args;       /* arg list if !argf    */
#endif
{
      reg int           v = 0, n_s, base, fmt, flags;
      Sflong_t    lv;
      reg char    *sp, *ssp, *endsp, *ep, *endep;
      int         dot, width, precis, n, n_output;
      int         sign, decpt;
      ssize_t           size;
      double            dval;
#if !_ast_fltmax_double
      Sfdouble_t  ldval;
#endif
      char        *tls[2], **ls;    /* for %..[separ]s            */
      char*       t_str;            /* stuff between ()           */
      ssize_t           n_str;            /* its length                 */

      Argv_t            argv;       /* for extf to return value   */
      Sffmt_t           *ft;        /* format environment         */
      Fmt_t       *fm, *fmstk;      /* stack contexts       */

      char*       oform;            /* original format string     */
      va_list           oargs;            /* original arg list          */
      Fmtpos_t*   fp;         /* arg position list          */
      int         argp, argn; /* arg position and number    */

#define SLACK           1024
      char        buf[SF_MAXDIGITS+SLACK], data[SF_GRAIN];
      int         decimal = 0, thousand = 0;

      /* fast io system */
      reg uchar   *d, *endd;
      reg int           w;
#define SFBUF(f)  (d = f->next, endd = f->endb)
#define SFINIT(f) (SFBUF(f), n_output = 0)
#define SFEND(f)  ((n_output += d - f->next), (f->next = d))
#define SFputc(f,c) \
      { if(d < endd)    { *d++ = (uchar)c; } \
        else \
        { SFEND(f); n_output += (w = SFFLSBUF(f,c)) >= 0 ? 1 : 0; SFBUF(f); \
          if(w < 0) goto done; \
        } \
      }
#define SFnputc(f,c,n) \
      { if((endd-d) >= n) { while(n--) *d++ = (uchar)c; } \
        else \
        { SFEND(f); n_output += (w = SFNPUTC(f,c,n)) > 0 ? w : 0; SFBUF(f); \
          if(n != w) goto done; n = 0;\
        } \
      }
#define SFwrite(f,s,n) \
      { if((endd-d) >= n) { MEMCPY(d,s,n); } \
        else \
        { SFEND(f); n_output += (w = SFWRITE(f,(Void_t*)s,n)) > 0 ? w : 0; SFBUF(f); \
          if(n != w) goto done; \
        } \
      }

      SFCVINIT(); /* initialize conversion tables */

      /* make sure stream is in write mode and buffer is not NULL */
      if(f->mode != SF_WRITE && _sfmode(f,SF_WRITE,0) < 0)
            return -1;

      SFLOCK(f,0);

      if(!f->data && !(f->flags&SF_STRING))
      {     f->data = f->next = (uchar*)data;
            f->endb = f->data+sizeof(data);
      }
      SFINIT(f);

      tls[1] = NIL(char*);

      fmstk = NIL(Fmt_t*); ft = NIL(Sffmt_t*);

      oform = (char*)form; va_copy(oargs,args);
      fp = NIL(Fmtpos_t*); argn = -1;

loop_fmt :
      while((n = *form) )
      {     if(n != '%') /* collect the non-pattern chars */
            {     sp = (char*)form++;
                  while(*form && *form != '%')
                        form += 1;
                  n = form-sp;
                  SFwrite(f,sp,n);
                  continue;
            }
            else  form += 1;

            flags = 0;
            size = width = precis = base = n_s = argp = -1;
            ssp = _Sfdigits;
            endep = ep = NIL(char*);
            endsp = sp = buf+(sizeof(buf)-1);
            t_str = NIL(char*);
            n_str = dot = 0;

      loop_flags: /* LOOP FOR \0, %, FLAGS, WIDTH, PRECISION, BASE, TYPE */
            switch((fmt = *form++) )
            {
            case '\0':
                  SFputc(f,'%');
                  goto pop_fmt;
            case '%' :
                  SFputc(f,'%');
                  continue;

            case LEFTP : /* get the type enclosed in balanced parens */
                  t_str = (char*)form;
                  for(v = 1;;)
                  {     switch(*form++)
                        {
                        case 0 :    /* not balancable, retract */
                              form = t_str;
                              t_str = NIL(char*);
                              n_str = 0;
                              goto loop_flags;
                        case LEFTP :      /* increasing nested level */
                              v += 1;
                              continue;
                        case RIGHTP :     /* decreasing nested level */
                              if((v -= 1) != 0)
                                    continue;
                              if(*t_str != '*' )
                                    n_str = (form-1)-t_str;
                              else
                              {     t_str = (*_Sffmtintf)(t_str+1,&n);
                                    if(*t_str == '$')
                                    {     if(!fp &&
                                             !(fp = (*_Sffmtposf)
                                                  (f,oform,oargs,0)) )
                                                goto pop_fmt;
                                          n = FP_SET(n,argn);
                                    }
                                    else  n = FP_SET(-1,argn);

                                    if(fp)
                                    {     t_str = fp[n].argv.s;
                                          n_str = fp[n].ft.size;
                                    }
                                    else if(ft && ft->extf )
                                    {     FMTSET(ft, form,args,
                                                LEFTP, 0, 0, 0,0,0,
                                                NIL(char*),0);
                                          n = (*ft->extf)
                                                (f,(Void_t*)&argv,ft);
                                          if(n < 0)
                                                goto pop_fmt;
                                          if(!(ft->flags&SFFMT_VALUE) )
                                                goto t_arg;
                                          if((t_str = argv.s) &&
                                             (n_str = (int)ft->size) < 0)
                                                n_str = strlen(t_str);
                                    }
                                    else
                                    { t_arg:
                                          if((t_str = va_arg(args,char*)) )
                                                n_str = strlen(t_str);
                                    }
                              }
                              goto loop_flags;
                        }
                  }

            case '-' :
                  flags = (flags & ~SFFMT_ZERO) | SFFMT_LEFT;
                  goto loop_flags;
            case '0' :
                  if(!(flags&SFFMT_LEFT) )
                        flags |= SFFMT_ZERO;
                  goto loop_flags;
            case ' ' :
                  if(!(flags&SFFMT_SIGN) )
                        flags |= SFFMT_BLANK;
                  goto loop_flags;
            case '+' :
                  flags = (flags & ~SFFMT_BLANK) | SFFMT_SIGN;
                  goto loop_flags;
            case '#' :
                  flags |= SFFMT_ALTER;
                  goto loop_flags;
            case QUOTE:
                  SFSETLOCALE(&decimal,&thousand);
                  if(thousand)
                        flags |= SFFMT_THOUSAND;
                  goto loop_flags;

            case '.' :
                  if((dot += 1) == 2)
                        base = 0; /* for %s,%c */
                  if(isdigit(*form) )
                  {     fmt = *form++;
                        goto dot_size;
                  }
                  else if(*form != '*')
                        goto loop_flags;
                  else  form += 1; /* fall thru for '*' */

            case '*' :
                  form = (*_Sffmtintf)(form,&n);
                  if(*form == '$')
                  {     form += 1;
                        if(!fp && !(fp = (*_Sffmtposf)(f,oform,oargs,0)) )
                              goto pop_fmt;
                        n = FP_SET(n,argn);
                  }
                  else  n = FP_SET(-1,argn);

                  if(fp)
                        v = fp[n].argv.i;
                  else if(ft && ft->extf)
                  {     FMTSET(ft, form,args, '.',dot, 0, 0,0,0, NIL(char*), 0);
                        if((*ft->extf)(f, (Void_t*)(&argv), ft) < 0)
                              goto pop_fmt;
                        if(ft->flags&SFFMT_VALUE)
                              v = argv.i;
                        else  v = (dot <= 2) ? va_arg(args,int) : 0;
                  }
                  else  v = dot <= 2 ? va_arg(args,int) : 0;
                  goto dot_set;

            case '1' : case '2' : case '3' :
            case '4' : case '5' : case '6' :
            case '7' : case '8' : case '9' :
            dot_size :
                  for(v = fmt - '0'; isdigit(*form); ++form)
                        v = v*10 + (*form - '0');
                  if(*form == '$')
                  {     form += 1;
                        if(!fp && !(fp = (*_Sffmtposf)(f,oform,oargs,0)) )
                              goto pop_fmt;
                        argp = v-1;
                        goto loop_flags;
                  }
            dot_set :
                  if(dot == 0)
                  {     if((width = v) < 0)
                        {     width = -width;
                              flags = (flags & ~SFFMT_ZERO) | SFFMT_LEFT;
                        }
                  }
                  else if(dot == 1)
                        precis = v;
                  else if(dot == 2)
                        base = v;
                  goto loop_flags;

            case 'I' : /* object length */
                  size = 0;
                  flags = (flags & ~SFFMT_TYPES) | SFFMT_IFLAG;
                  if(isdigit(*form) )
                  {     for(n = *form; isdigit(n); n = *++form)
                              size = size*10 + (n - '0');
                  }
                  else if(*form == '*')
                  {     form = (*_Sffmtintf)(form+1,&n);
                        if(*form == '$')
                        {     form += 1;
                              if(!fp && !(fp = (*_Sffmtposf)(f,oform,oargs,0)))
                                    goto pop_fmt;
                              n = FP_SET(n,argn);
                        }
                        else  n = FP_SET(-1,argn);

                        if(fp)      /* use position list */
                              size = fp[n].argv.i;
                        else if(ft && ft->extf)
                        {     FMTSET(ft, form,args, 'I',sizeof(int), 0, 0,0,0,
                                    NIL(char*), 0);
                              if((*ft->extf)(f, (Void_t*)(&argv), ft) < 0)
                                    goto pop_fmt;
                              if(ft->flags&SFFMT_VALUE)
                                    size = argv.i;
                              else  size = va_arg(args,int);
                        }
                        else  size = va_arg(args,int);
                  }
                  goto loop_flags;

            case 'l' :
                  size = -1;
                  flags &= ~SFFMT_TYPES;
                  if(*form == 'l')
                  {     form += 1;
                        flags |= SFFMT_LLONG;
                  }
                  else  flags |= SFFMT_LONG;
                  goto loop_flags;
            case 'h' :
                  size = -1;
                  flags = (flags & ~SFFMT_TYPES) | SFFMT_SHORT;
                  goto loop_flags;
            case 'L' :
                  size = -1;
                  flags = (flags & ~SFFMT_TYPES) | SFFMT_LDOUBLE;
                  goto loop_flags;
            }

            /* set the correct size */
            if(flags & (SFFMT_TYPES & ~SFFMT_IFLAG) )
            {     if((_Sftype[fmt]&(SFFMT_INT|SFFMT_UINT)) || fmt == 'n')
                  {     size =      (flags&SFFMT_LLONG) ? sizeof(Sflong_t) :
                              (flags&SFFMT_LONG) ? sizeof(long) :
                              (flags&SFFMT_SHORT) ? sizeof(short) : -1;
                  }
                  else if(_Sftype[fmt]&SFFMT_FLOAT)
                  {     size = (flags&SFFMT_LDOUBLE) ? sizeof(Sfdouble_t) :
                               (flags&(SFFMT_LONG|SFFMT_LLONG)) ?
                                    sizeof(double) : -1;
                  }
            }

            argp = FP_SET(argp,argn);
            if(fp)
            {     if(ft && ft->extf && fp[argp].ft.fmt != fp[argp].fmt)
                        fmt = fp[argp].ft.fmt;
                  argv = fp[argp].argv;
                  size = fp[argp].ft.size;
            }
            else if(ft && ft->extf )      /* extended processing */
            {     FMTSET(ft, form,args, fmt, size,flags, width,precis,base,
                        t_str,n_str);
                  SFEND(f); SFOPEN(f,0);
                  v = (*ft->extf)(f, (Void_t*)(&argv), ft);
                  SFLOCK(f,0); SFBUF(f);

                  if(v < 0)
                        goto pop_fmt;
                  else if(v == 0)   /* extf did not output */
                  {     FMTGET(ft, form,args, fmt, size,flags, width,precis,base);
                        if(!(ft->flags&SFFMT_VALUE) )
                              goto get_val;
                  }
                  else if(v > 0) /* extf output v bytes */
                  {     n_output += v;
                        continue;
                  }
            }
            else
            { get_val:
                  switch(_Sftype[fmt])
                  { case SFFMT_INT:
                    case SFFMT_UINT:
#if !_ast_intmax_long
                        if(FMTCMP(size, Sflong_t, Sflong_t))
                              argv.ll = va_arg(args, Sflong_t);
                        else
#endif
                        if(FMTCMP(size, long, Sflong_t) )
                              argv.l = va_arg(args, long);
                        else  argv.i = va_arg(args, int);
                        break;
                   case SFFMT_FLOAT:
#if !_ast_fltmax_double
                        if(FMTCMP(size, Sfdouble_t, Sfdouble_t))
                              argv.ld = va_arg(args,Sfdouble_t);
                        else
#endif
                              argv.d  = va_arg(args,double);
                        break;
                   case SFFMT_POINTER:
                              argv.vp = va_arg(args,Void_t*);
                        break;
                   case SFFMT_BYTE:
                        if(base >= 0)
                              argv.s = va_arg(args,char*);
                        else  argv.c = (char)va_arg(args,int);
                        break;
                   default: /* unknown pattern */
                        break;
                  }
            }

            switch(fmt) /* PRINTF DIRECTIVES */
            {
            default :   /* unknown directive */
                  form -= 1;
                  argn -= 1;
                  continue;

            case '!' :  /* stacking a new environment */
                  if(!fp)
                        fp = (*_Sffmtposf)(f,oform,oargs,0);
                  else  goto pop_fmt;

                  if(!argv.ft)
                        goto pop_fmt;
                  if(!argv.ft->form && ft ) /* change extension functions */
                  {     if(ft->eventf &&
                           (*ft->eventf)(f,SF_DPOP,(Void_t*)form,ft) < 0)
                              continue;
                        fmstk->ft = ft = argv.ft;
                  }
                  else              /* stack a new environment */
                  {     if(!FMTALLOC(fm))
                              goto done;

                        if(argv.ft->form)
                        {     fm->form = (char*)form;
                              va_copy(fm->args,args);

                              fm->oform = oform;
                              va_copy(fm->oargs,oargs);
                              fm->argn = argn;
                              fm->fp = fp;

                              form = argv.ft->form;   
                              va_copy(args,argv.ft->args);
                              argn = -1;
                              fp = NIL(Fmtpos_t*);
                        }
                        else  fm->form = NIL(char*);

                        fm->eventf = argv.ft->eventf;
                        fm->ft = ft;
                        fm->next = fmstk;
                        fmstk = fm;
                        ft = argv.ft;
                  }
                  continue;

            case 's':
                  if(base >= 0)     /* list of strings */
                  {     if(!(ls = argv.sp) || !ls[0])
                              continue;
                  }
                  else
                  {     if(!(sp = argv.s))
                              sp = "(null)";
                        ls = tls; tls[0] = sp;
                  }
                  for(sp = *ls; ; )
                  {     if((v = size) >= 0)
                        {     if(precis >= 0 && v > precis)
                                    v = precis;
                        }
                        else if(precis < 0)
                              v = strlen(sp);
                        else /* precis >= 0 means min(strlen,precis) */
                        {     for(v = 0; v < precis; ++v)
                                    if(sp[v] == 0)
                                          break;
                        }
                        if((n = width - v) > 0)
                        {     if(flags&SFFMT_ZERO)
                                    { SFnputc(f,'0',n); }
                              else if(!(flags&SFFMT_LEFT) )
                                    { SFnputc(f,' ',n); }
                        }
                        SFwrite(f,sp,v);
                        if(n > 0)
                              { SFnputc(f,' ',n); }
                        if(!(sp = *++ls))
                              break;
                        else if(base > 0)
                              { SFputc(f,base); }
                  }
                  continue;

            case 'c':   /* an array of characters */
                  if(base >= 0)
                  {     if(!(sp = argv.s) || !sp[0])
                              continue;
                  }
                  else
                  {     fmt = (int)argv.c;
                        sp = buf; buf[0] = fmt; buf[1] = 0;
                  }
                  if(precis <= 0)
                        precis = 1;
                  for(fmt = *sp;; )
                  {     if((n = width-precis) > 0 && !(flags&SFFMT_LEFT))
                              { SFnputc(f,' ',n) };
                        v = precis;
                        SFnputc(f,fmt,v);
                        if(n > 0)
                              { SFnputc(f,' ',n) };
                        if(!(fmt = *++sp))
                              break;
                        else if(base > 0)
                              { SFputc(f,base); }
                  }
                  continue;

            case 'n':   /* return current output length */
                  SFEND(f);
#if !_ast_intmax_long
                  if(FMTCMP(size, Sflong_t, Sflong_t))
                        *((Sflong_t*)argv.vp) = (Sflong_t)n_output;
                  else
#endif
                  if(FMTCMP(size, long, Sflong_t))
                        *((long*)argv.vp) = (long)n_output;
                  else if(sizeof(short) < sizeof(int) &&
                        FMTCMP(size,short,Sflong_t) )
                        *((short*)argv.vp) = (short)n_output;
                  else  *((int*)argv.vp) = (int)n_output;

                  continue;

            case 'p':   /* pointer value */
                  fmt = 'x';
                  base = 16; n_s = 15; n = 4;
                  flags = (flags&~(SFFMT_SIGN|SFFMT_BLANK|SFFMT_ZERO))|SFFMT_ALTER;
#if _more_void_int
                  lv = (Sflong_t)((Sfulong_t)argv.vp);
                  goto long_cvt;
#else
                  v = (int)((uint)argv.vp);
                  goto int_cvt;
#endif
            case 'o':
                  base = 8; n_s = 7; n = 3;
                  flags &= ~(SFFMT_SIGN|SFFMT_BLANK);
                  goto int_arg;
            case 'X':
                  ssp = "0123456789ABCDEF";
            case 'x':
                  base = 16; n_s = 15; n = 4;
                  flags &= ~(SFFMT_SIGN|SFFMT_BLANK);
                  goto int_arg;
            case 'i':
                  fmt = 'd';
                  goto d_format;
            case 'u':
                  flags &= ~(SFFMT_SIGN|SFFMT_BLANK);
            case 'd':
            d_format:
                  if(base < 2 || base > SF_RADIX)
                        base = 10;
                  if((base&(n_s = base-1)) == 0)
                  {     if(base < 8)
                              n = base <  4 ? 1 : 2;
                        else if(base < 32)
                              n = base < 16 ? 3 : 4;
                        else  n = base < 64 ? 5 : 6;
                  }
                  else  n_s = base == 10 ? -1 : 0;

            int_arg:
#if !_ast_intmax_long ||  _more_long_int || _more_void_int
                  if(FMTCMP(size, Sflong_t, Sflong_t))
                  {     lv = argv.ll;
                        goto long_cvt;
                  }
                  else if(FMTCMP(size, long, Sflong_t))
                  {     if(fmt == 'd')
                              lv = (Sflong_t)argv.l;
                        else  lv = (Sflong_t)((ulong)argv.l);
                  long_cvt:
                        if(lv == 0 && precis == 0)
                              break;
                        if(lv < 0 && fmt == 'd' )
                        {     flags |= SFFMT_MINUS;
                              if(lv == HIGHBITL) /* avoid overflow */
                              {     lv = (Sflong_t)(HIGHBITL/base);
                                    *--sp = _Sfdigits[HIGHBITL -
                                                  ((Sfulong_t)lv)*base];
                              }
                              else  lv = -lv;
                        }
                        if(n_s < 0) /* base 10 */
                        {     reg Sflong_t      nv;
                              sfucvt(lv,sp,nv,ssp,Sflong_t,Sfulong_t);
                        }
                        else if(n_s > 0) /* base power-of-2 */
                        {     do
                              {     *--sp = ssp[lv&n_s];
                              } while((lv = ((Sfulong_t)lv) >> n) );
                        }
                        else        /* general base */
                        {     do
                              {     *--sp = ssp[((Sfulong_t)lv)%base];
                              } while((lv = ((Sfulong_t)lv)/base) );
                        }
                  } else
#endif
                  if(sizeof(short) < sizeof(int) && FMTCMP(size,short,Sflong_t))
                  {     if(ft && ft->extf && (ft->flags&SFFMT_VALUE) )
                        {     if(fmt == 'd')
                                    v = (int)argv.h;
                              else  v = (int)((ushort)argv.h);
                        }
                        else
                        {     if(fmt == 'd')
                                    v = (int)argv.i;
                              else  v = (int)(ushort)argv.i;
                        }
                        goto int_cvt;
                  }
                  else
                  {     v = argv.i;
                  int_cvt:
                        if(v == 0 && precis == 0)
                              break;
                        if(v < 0 && fmt == 'd' )
                        {     flags |= SFFMT_MINUS;
                              if(v == HIGHBITI) /* avoid overflow */
                              {     v = (int)(HIGHBITI/base);
                                    *--sp = _Sfdigits[HIGHBITI -
                                                  ((uint)v)*base];
                              }
                              else  v = -v;
                        }
                        if(n_s < 0) /* base 10 */
                        {     sfucvt(v,sp,n,ssp,int,uint);
                        }
                        else if(n_s > 0) /* base power-of-2 */
                        {     do
                              {     *--sp = ssp[v&n_s];
                              } while((v = ((uint)v) >> n) );
                        }
                        else /* n_s == 0, general base */
                        {     do
                              {     *--sp = ssp[((uint)v)%base];
                              } while((v = ((uint)v)/base) );
                        }
                  }

                  if(n_s < 0 && (flags&SFFMT_THOUSAND) && (n = endsp-sp) > 3)
                  {     if((n %= 3) == 0)
                              n = 3;
                        for(ep = buf+SLACK, endep = ep + n; ; )
                        {     while(ep < endep)
                                    *ep++ = *sp++;
                              if(sp == endsp)
                                    break;
                              if(sp <= endsp-3)
                                    *ep++ = thousand;
                              endep = ep+3;
                        }
                        sp = buf+SLACK;
                        endsp = ep;
                  }

                  /* zero padding for precision if have room in buffer */
                  if(precis > 0 && (precis -= (endsp-sp)) < (sp-buf)-64)
                        while(precis-- > 0)
                              *--sp = '0';

                  if(flags&SFFMT_ALTER) /* prefix */
                  {     if(fmt == 'o')
                        {     if(*sp != '0')
                                    *--sp = '0';
                        }
                        else
                        {     if(width > 0 && (flags&SFFMT_ZERO))
                              {     /* do 0 padding first */
                                    if(fmt == 'x' || fmt == 'X')
                                          n = 0;
                                    else if(dot < 2)
                                          n = width;
                                    else  n = base < 10 ? 2 : 3;
                                    n += (flags&(SFFMT_MINUS|SFFMT_SIGN)) ?
                                          1 : 0;
                                    n = width - (n + (endsp-sp));
                                    while(n-- > 0)
                                          *--sp = '0';
                              }
                              if(fmt == 'x' || fmt == 'X')
                              {     *--sp = (char)fmt;
                                    *--sp = '0';
                              }
                              else if(dot >= 2)
                              {     /* base#value notation */
                                    *--sp = '#';
                                    if(base < 10)
                                          *--sp = (char)('0'+base);
                                    else
                                    {     *--sp = _Sfdec[(base <<= 1)+1];
                                          *--sp = _Sfdec[base];
                                    }
                              }
                        }
                  }

                  break;

            case 'g': case 'G': /* these ultimately become %e or %f */
            case 'e': case 'E':
            case 'f':
#if !_ast_fltmax_double
                  if(FMTCMP(size,Sfdouble_t,Sfdouble_t))
                        ldval = argv.ld;
                  else
#endif
                  if(!(ft && ft->extf && (ft->flags&SFFMT_VALUE)) ||
                     FMTCMP(size,double,Sfdouble_t))
                        dval = argv.d;
                  else  dval = (double)argv.f;

                  if(fmt == 'e' || fmt == 'E')
                  {     n = (precis = precis < 0 ? FPRECIS : precis)+1;
#if !_ast_fltmax_double
                        if(FMTCMP(size,Sfdouble_t,Sfdouble_t))
                        {     ep = _sfcvt(&ldval,min(n,SF_FDIGITS),
                                    &decpt,&sign,
                                    SFFMT_EFORMAT|SFFMT_LDOUBLE );
                        } else
#endif
                        {     ep = _sfcvt(&dval,min(n,SF_FDIGITS),
                                    &decpt,&sign,SFFMT_EFORMAT);
                        }
                        goto e_format;
                  }
                  else if(fmt == 'f' || fmt == 'F')
                  {     precis = precis < 0 ? FPRECIS : precis;
#if !_ast_fltmax_double
                        if(FMTCMP(size,Sfdouble_t,Sfdouble_t))
                        {     ep = _sfcvt(&ldval,min(precis,SF_FDIGITS),
                                    &decpt,&sign,SFFMT_LDOUBLE);
                        } else
#endif
                        {     ep = _sfcvt(&dval,min(precis,SF_FDIGITS),
                                    &decpt,&sign,0);
                        }
                        goto f_format;
                  }

                  /* 'g' or 'G' format */
                  precis = precis < 0 ? FPRECIS : precis == 0 ? 1 : precis;
#if !_ast_fltmax_double
                  if(FMTCMP(size,Sfdouble_t,Sfdouble_t))
                  {     ep = _sfcvt(&ldval,min(precis,SF_FDIGITS),
                              &decpt,&sign,SFFMT_EFORMAT|SFFMT_LDOUBLE);
                        if(ldval == 0.)
                              decpt = 1;
                        else if(*ep == 'I')
                              goto infinite;
                  } else
#endif
                  {     ep = _sfcvt(&dval,min(precis,SF_FDIGITS),
                              &decpt,&sign,SFFMT_EFORMAT);
                        if(dval == 0.)
                              decpt = 1;
                        else if(*ep == 'I')
                              goto infinite;
                  }

                  if(!(flags&SFFMT_ALTER))
                  {     /* zap trailing 0s */
                        if((n = sfslen()) > precis)
                              n = precis;
                        while((n -= 1) >= 1 && ep[n] == '0')
                              ;
                        n += 1;
                  }
                  else  n = precis;

                  if(decpt < -3 || decpt > precis)
                  {     precis = n-1;
                        goto e_format;
                  }
                  else
                  {     precis = n - decpt;
                        goto f_format;
                  }

            e_format: /* build the x.yyyy string */
                  if(isalpha(*ep))
                        goto infinite;
                  sp = endsp = buf+1;     /* reserve space for sign */
                  *endsp++ = *ep ? *ep++ : '0';

                  SFSETLOCALE(&decimal,&thousand);
                  if(precis > 0 || (flags&SFFMT_ALTER))
                        *endsp++ = decimal;
                  ssp = endsp;
                  endep = ep+precis;
                  while((*endsp++ = *ep++) && ep <= endep)
                        ;
                  precis -= (endsp -= 1) - ssp;

                  /* build the exponent */
                  ep = endep = buf+(sizeof(buf)-1);
#if !_ast_fltmax_double
                  if(FMTCMP(size,Sfdouble_t,Sfdouble_t))
                        dval = ldval ? 1. : 0.; /* so the below test works */
#endif
                  if(dval != 0.)
                  {     if((n = decpt - 1) < 0)
                              n = -n;
                        while(n > 9)
                        {     v = n; n /= 10;   
                              *--ep = (char)('0' + (v - n*10));
                        }
                  }
                  else  n = 0;
                  *--ep = (char)('0' + n);
                  if(endep-ep <= 1) /* at least 2 digits */
                        *--ep = '0';

                  /* the e/Exponent separator and sign */
                  *--ep = (decpt > 0 || dval == 0.) ? '+' : '-';
                  *--ep = isupper(fmt) ? 'E' : 'e';

                  goto end_efg;

            f_format: /* data before the decimal point */
                  if(isalpha(*ep))
                  {
                  infinite:
                        endsp = (sp = ep)+sfslen();
                        ep = endep;
                        precis = 0;
                        goto end_efg;
                  }

                  SFSETLOCALE(&decimal,&thousand);
                  endsp = sp = buf+1;     /* save a space for sign */
                  endep = ep+decpt;
                  if(decpt > 3 && (flags&SFFMT_THOUSAND) )
                  {     if((n = decpt%3) == 0)
                              n = 3;
                        while(ep < endep && (*endsp++ = *ep++) )
                        {     if(--n == 0 && (ep <= endep-3) )
                              {     *endsp++ = thousand;
                                    n = 3;
                              }
                        }
                  }
                  else
                  {     while(ep < endep && (*endsp++ = *ep++))
                              ;
                  }
                  if(endsp == sp)
                        *endsp++ = '0';

                  if(precis > 0 || (flags&SFFMT_ALTER))
                        *endsp++ = decimal;

                  if((n = -decpt) > 0)
                  {     /* output zeros for negative exponent */
                        ssp = endsp + min(n,precis);
                        precis -= n;
                        while(endsp < ssp)
                              *endsp++ = '0';
                  }

                  ssp = endsp;
                  endep = ep+precis;
                  while((*endsp++ = *ep++) && ep <= endep)
                        ;
                  precis -= (endsp -= 1) - ssp;
                  ep = endep;
            end_efg:
                  flags |= SFFMT_FLOAT;
                  if(sign)
                        flags |= SFFMT_MINUS;
                  break;
            }

            if(flags == 0 && width <= 0)
                  goto do_output;

            if(flags&SFFMT_PREFIX)
                  fmt = (flags&SFFMT_MINUS) ? '-' : (flags&SFFMT_SIGN) ? '+' : ' ';

            n = (endsp-sp) + (endep-ep) + (precis <= 0 ? 0 : precis) +
                ((flags&SFFMT_PREFIX) ? 1 : 0);
            if((v = width-n) <= 0)
                  v = 0;
            else if(!(flags&SFFMT_ZERO)) /* right padding */
            {     if(flags&SFFMT_LEFT)
                        v = -v;
                  else if(flags&SFFMT_PREFIX) /* blank padding, output prefix now */
                  {     *--sp = fmt;
                        flags &= ~SFFMT_PREFIX;
                  }
            }

            if(flags&SFFMT_PREFIX) /* put out the prefix */
            {     SFputc(f,fmt);
                  if(fmt != ' ')
                        flags |= SFFMT_ZERO;
            }

            if((n = v) > 0) /* left padding */
            {     v = (flags&SFFMT_ZERO) ? '0' : ' ';
                  SFnputc(f,v,n);
            }

            if((n = precis) > 0 && !(flags&SFFMT_FLOAT))
            {     /* padding for integer precision */
                  SFnputc(f,'0',n);
                  precis = 0;
            }

      do_output:
            if((n = endsp-sp) > 0)
                  SFwrite(f,sp,n);

            if(flags&(SFFMT_FLOAT|SFFMT_LEFT))
            {     /* SFFMT_FLOAT: right padding for float precision */
                  if((n = precis) > 0)
                        SFnputc(f,'0',n);

                  /* SFFMT_FLOAT: the exponent of %eE */
                  if((n = endep-(sp=ep)) > 0)
                        SFwrite(f,sp,n);

                  /* SFFMT_LEFT: right padding */
                  if((n = -v) > 0)
                        SFnputc(f,' ',n);
            }
      }

pop_fmt:
      if(fp)
      {     free(fp);
            fp = NIL(Fmtpos_t*);
      }
      while((fm = fmstk) ) /* pop the format stack and continue */
      {     if(fm->eventf)
            {     if(!form || !form[0])
                        (*fm->eventf)(f,SF_FINAL,NIL(Void_t*),ft);
                  else if((*fm->eventf)(f,SF_DPOP,(Void_t*)form,ft) < 0)
                        goto loop_fmt;
            }

            fmstk = fm->next;
            if((form = fm->form) )
            {     va_copy(args, fm->args);
                  oform = fm->oform;
                  va_copy(oargs,fm->oargs);
                  argn = fm->argn;
                  fp = fm->fp;
            }
            ft = fm->ft;
            FMTFREE(fm);
            if(form && form[0])
                  goto loop_fmt;
      }

done:
      if(fp)
            free(fp);
      while((fm = fmstk) )
      {     if(fm->eventf)
                  (*fm->eventf)(f,SF_FINAL,NIL(Void_t*),fm->ft);
            fmstk = fm->next;
            FMTFREE(fm);
      }

      SFEND(f);

      n = f->next - f->data;
      if((d = f->data) == (uchar*)data)
            f->endw = f->endr = f->endb = f->data = NIL(uchar*);
      f->next = f->data;

      if((((flags = f->flags)&SF_SHARE) && !(flags&SF_PUBLIC) ) ||
         (n > 0 && (d == (uchar*)data || (flags&SF_LINE) ) ) )
            (void)SFWRITE(f,(Void_t*)d,n);
      else  f->next += n;

      SFOPEN(f,0);
      return n_output;
}

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