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#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <float.h>
#include <ieeefp.h>
#include <stdlib.h>
#include <string.h>
#define _MAX_CHARS 512
 
static char *lcset = "0123456789abcdef";
 
static struct p {
        double pvalue, nvalue;
        int exp;
} powers[] =
{
{ 1e32, 1e-32, 32},
{ 1e16, 1e-16, 16},
{ 1e8, 1e-8, 8},
{ 1e4, 1e-4, 4},
{ 1e2, 1e-2, 2},
{ 1e1, 1e-1, 1 },
{ 1e0, 1e-0, 0 }
};
 
#define _MAX_PREC 16
 
static char
_DEFUN(nextdigit,(value),
double *value)
{
  double tmp;
 
  *value = modf (*value * 10, &tmp) ;
  return  lcset[(int)tmp];
}
 
 
static char *
_DEFUN(print_nan,(buffer, value, precision),
       char *buffer _AND
       double value _AND
       int precision)
{
  size_t  i;
 
  if (isnan(value))
    {
      strcpy(buffer, "nan");
      i = 3;
 
    }
  else
    {
      strcpy(buffer, "infinity");
      i = 8;
    }
 
  while (i < precision)
    {
      buffer[i++] = ' ';
    }
  buffer[i++] = 0;
  return buffer;
 
}
 
/* A convert info struct */
typedef struct
{
  char *buffer ;                /* Destination of conversion */
  double value;                 /* scratch Value to convert */
  double original_value;        /* saved Value to convert */
  int value_neg;                /* OUT: 1 if value initialiy neg */
  int abs_exp;                  /* abs Decimal exponent of value */
  int abs_exp_sign;             /* + or - */
  int exp;                      /* exp not sgned */
  int type;                     /* fFeEgG used in printing before exp */
 
  int print_trailing_zeros;     /* Print 00's after a . */
 
  int null_idx;  /* Index of the null at the end */
 
/* These ones are read only */
  int decimal_places;           /* the number of digits to print after
                                   the decimal */
  int max_digits;               /* total number of digits to print */
  int buffer_size;              /* Size of output buffer */
 
  /* Two sorts of dot ness.
 
     1  print a dot if followed by a digit
     2  always print a dot, even if no digit following
     */
  enum { dot_never, dot_sometimes, dot_always} dot; /* Print a decimal point, always */
  int dot_idx;                  /* where the dot went, or would have gone */
} cvt_info_type;
 
 
void
_DEFUN(renormalize,(in),
       cvt_info_type *in)
{
 
  /* Make sure all numbers are less than 1 */
 
  while (in->value >= 1.0)
  {
    in->value = in->value * 0.1;
    in->exp++;
  }
 
  /* Now we have only numbers between 0 and .9999.., and have adjusted
     exp to account for the shift */
 
  if (in->exp >= 0)
  {
    in->abs_exp_sign = '+';
    in->abs_exp = in->exp;
  }
  else
  {
    in->abs_exp_sign  = '-';
    in->abs_exp = -in->exp;
  }
 
}
 
/* This routine looks at original_value, and makes it between 0 and 1,
   modifying exp as it goes
 */
 
static void
_DEFUN(normalize,(value, in),
       double value _AND
       cvt_info_type *in)
{
  int j;
  int texp;
  if (value != 0)
  {
     texp = -1;
 
 
  if (value < 0.0)
  {
    in->value_neg =1 ;
    value = - value;
  }
  else
  {
    in->value_neg = 0;
  }
 
 
  /* Work out texponent & normalise value */
 
  /* If value > 1, then shrink it */
  if (value >= 1.0)
  {
    for (j = 0; j < 6; j++)
    {
      while (value >= powers[j].pvalue)
      {
        value /= powers[j].pvalue;
        texp += powers[j].exp;
      }
    }
  }
  else if (value != 0.0)
  {
    for (j = 0; j < 6; j++)
    {
      while (value <= powers[j].nvalue)
      {
        value *= powers[j].pvalue;
        texp -= powers[j].exp;
      }
    }
  }
   }
 
  else
  {
    texp = 0;
  }
 
 
  in->exp = texp;
  in->value = value;
  in->original_value = value;
  renormalize(in);
 
}
int
_DEFUN(round,(in, start, now, ch),
       cvt_info_type *in _AND
       char *start _AND
       char *now _AND
       char ch)
{
  double rounder = 5.0;
 
  char *p;
  int ok = 0;
 
  now --;
 
  /* If the next digit to output would have been a '5' run back and */
  /* see if we can create a more rounded number. If we can then do it.
     If not (like when the number was 9.9 and the last char was
     another 9), then we'll have to modify the number and try again */
  if (ch < '5')
   return 0;
 
 
  for (p = now;!ok && p >= start; p--)
  {
    switch (*p)
    {
    default:
      abort();
    case '.':
      break;
    case '9':
      rounder = rounder * 0.1;
      break;
    case '8':
    case '7':
    case '6':
    case '5':
    case '4':
    case '3':
    case '2':
    case '1':
    case '0':
      p = now;
      while (1) {
          if (*p == '9') {
              *p = '0';
            }
          else if (*p != '.') {
              (*p)++;
              return 0;
            }
          p--;
        }
    }
 
  }
 
  /* Getting here means that we couldn't round the number in place
     textually - there have been all nines.
     We'll have to add to it and try the conversion again
     eg
     .99999[9] can't be rounded in place, so add
     .000005   to it giving:
     1.000004   we notice that the result is > 1 so add to exp and
     divide by 10
     .100004
     */
 
  in->original_value = in->value = in->original_value + rounder;
  normalize(in->original_value , in);
  return 1;
 
 
}
 
 
 
void
_DEFUN(_cvte,(in),
       register  cvt_info_type *in)
{
  int buffer_idx  =0;
  int digit = 0;
 
  int after_decimal =0;
 
  in->buffer[buffer_idx++] = nextdigit(&(in->value));
  digit++;
  in->dot_idx = buffer_idx;
 
 
  switch (in->dot)
  {
  case dot_never:
    break;
  case dot_sometimes:
    if (in->decimal_places
        && digit < in->max_digits)
    {
      in->buffer[buffer_idx++] = '.';
    }
    break;
  case dot_always:
    in->buffer[buffer_idx++] = '.';
  }
 
 
  while (buffer_idx < in->buffer_size
         && after_decimal < in->decimal_places
         && digit < in->max_digits)
  {
    in->buffer[buffer_idx] = nextdigit(&(in->value));
    after_decimal++;
    buffer_idx++;
    digit++;
 
  }
 
  if (round(in,
            in->buffer,
            in->buffer+buffer_idx,
            nextdigit(&(in->value))))
  {
    _cvte(in);
  }
  else
  {
    in->buffer[buffer_idx++] = in->type;
    in->buffer[buffer_idx++] = in->abs_exp_sign;
 
    if (in->abs_exp >= 100)
    {
      in->buffer[buffer_idx++] = lcset[in->abs_exp / 100];
      in->abs_exp %= 100;
    }
    in->buffer[buffer_idx++] = lcset[in->abs_exp / 10];
    in->buffer[buffer_idx++] = lcset[in->abs_exp % 10];
  }
 
  in->buffer[buffer_idx++] = 0;
}
 
 
 
 
/* Produce NNNN.FFFF */
void
_DEFUN(_cvtf,(in),
       cvt_info_type *in)
{
 
  int buffer_idx = 0;            /* Current char being output */
  int after_decimal = 0;
  int digit =0;
 
 
  in->dot_idx = in->exp + 1;
 
  /* Two sorts of number, NNN.FFF and 0.0000...FFFF */
 
 
  /* Print all the digits up to the decimal point */
 
  while (buffer_idx <= in->exp
         && digit < in->max_digits
         && buffer_idx < in->buffer_size)
  {
    in->buffer[buffer_idx]  = nextdigit(&(in->value));
    buffer_idx++;
    digit ++;
  }
 
 
  /* And the decimal point if we should */
  if (buffer_idx < in->buffer_size)
  {
 
    switch (in->dot)
    {
    case dot_never:
      break;
    case dot_sometimes:
      /* Only print a dot if following chars */
      if (in->decimal_places
          && digit < in->max_digits )
      {
       in->buffer[buffer_idx++] = '.';
     }
 
      break;
    case dot_always:
      in->buffer[buffer_idx++] = '.';
    }
 
    after_decimal = 0;
 
    /* And the digits following the point if necessary */
 
    /* Only print the leading zeros if a dot was possible */
    if (in->dot || in->exp>0)
    {
     while (buffer_idx < in->buffer_size
            && (in->abs_exp_sign == '-' && digit < in->abs_exp - 1)
            && (after_decimal < in->decimal_places)
            && (digit < in->max_digits))
     {
       in->buffer[buffer_idx] = '0';
       buffer_idx++;
       digit++;
       after_decimal++;
     }
   }
 
    while (buffer_idx < in->buffer_size
           && after_decimal < in->decimal_places
           && digit < in->max_digits)
    {
      in->buffer[buffer_idx]  = nextdigit(&(in->value));
      buffer_idx++;
      digit++;
      after_decimal++;
    }
  }
 
  in->null_idx = buffer_idx;
  in->buffer[buffer_idx] = 0;
  if (round(in, in->buffer, in->buffer+buffer_idx,
            nextdigit(&(in->value))))
  {
      _cvtf(in);
  }
 
 
 
 
}
 
 
 
char *
_DEFUN(_dcvt,(buffer, invalue, precision, width, type, dot),
       char *buffer _AND
       double invalue _AND
       int precision _AND
       int width _AND
       char type _AND
       int dot)
{
  cvt_info_type in;
 
 
 
  in.buffer = buffer;
  in.buffer_size = 512;
 
  if (!finite(invalue))
  {
    return print_nan(buffer, invalue, precision);
  }
 
 
  normalize(invalue, &in);
 
  in.type = type;
  in.dot = dot? dot_always: dot_sometimes;
 
  switch (type)
  {
 
  case 'g':
  case 'G':
    /* When formatting a g, the precision refers to the number of
       char positions *total*, this leads to various off by ones */
  {
    /* A precision of 0 means 1 */
    if (precision == 0)
     precision = 1;
 
    /* A g turns into an e if there are more digits than the
       precision, or it's smaller than e-4 */
    if (in.exp >= precision || in.exp < -4)
    {
      in.type = (type == 'g' ? 'e' : 'E');
      in.decimal_places = _MAX_CHARS;
      in.max_digits = precision;
      in.print_trailing_zeros = 1;
      _cvte(&in);
    }
    else
    {
      /* G means total number of chars to print */
      in.decimal_places = _MAX_CHARS;
      in.max_digits = precision;
      in.type = (type == 'g' ? 'f' : 'F');
      in.print_trailing_zeros = 0;
      _cvtf(&in);
 
   if (!dot) {
       /* trim trailing zeros */
       int j = in.null_idx -1;
       while (j > 0 && in.buffer[j] == '0')
       {
         in.buffer[j] = 0;
         j--;
       }
       /* Stamp on a . if not followed by zeros */
       if (j > 0 && buffer[j] == '.')
        in.buffer[j] = 0;
     }
    }
 
 
    break;
  case 'f':
  case 'F':
    in.decimal_places= precision;
    in.max_digits = _MAX_CHARS;
      in.print_trailing_zeros = 1;
    _cvtf(&in);
    break;
  case 'e':
  case 'E':
      in.print_trailing_zeros = 1;
    in.decimal_places = precision;
    in.max_digits = _MAX_CHARS;
    _cvte(&in);
    break;
  }
 
  }
 
 
  return buffer;
}
 
 
 
 
char *
_DEFUN(fcvtbuf,(invalue,ndigit,decpt,sign, fcvt_buf),
       double invalue _AND
       int ndigit _AND
       int *decpt _AND
       int *sign _AND
       char *fcvt_buf)
{
  cvt_info_type in;
  in.buffer = fcvt_buf;
  in.buffer_size = 512;
 
  if (!finite(invalue))
    {
      return print_nan(fcvt_buf, invalue, ndigit);
    }
 
  normalize(invalue, &in);
 
  in.dot = dot_never;                   /* Don't print a decimal point */
  in.max_digits = _MAX_CHARS;
  in.buffer_size = _MAX_CHARS;          /* Take as many as needed */
  in.decimal_places = ndigit;
  _cvtf(&in);
  *decpt = in.dot_idx;
  *sign = in.value_neg;
  return in.buffer;
}
 
 
char *
_DEFUN(ecvtbuf,(invalue,ndigit,decpt,sign, fcvt_buf),
       double invalue _AND
       int ndigit _AND
       int *decpt _AND
       int *sign _AND
       char *fcvt_buf)
{
  cvt_info_type in;
  in.buffer = fcvt_buf;
 
  if (!finite(invalue))
    {
      return print_nan(fcvt_buf, invalue, ndigit);
    }
 
  normalize(invalue, &in);
 
 
  in.dot = dot_never;                   /* Don't print a decimal point */
/* We can work out how many digits go after the decimal point */
 
  in.buffer_size =_MAX_CHARS;
  in.decimal_places = _MAX_CHARS;
  in.max_digits = ndigit;               /* Take as many as told */
  _cvtf(&in);
  *decpt = in.dot_idx;
  *sign = in.value_neg;
  return in.buffer;
}
 
 
 
char *
_DEFUN(gcvt,(d,ndigit,buf),
   double d _AND
   int ndigit _AND
   char *buf)
{
  return _dcvt(buf, d, ndigit, 0, 'g', 1);
}

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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libm/] [test/] [dcvt.c] - Blame information for rev 1767

Line No.	Rev	Author	Line
1	39	lampret
2
3			`#include <limits.h>`
4			`#include <math.h>`
5			`#include <stdio.h>`
6			`#include <float.h>`
7			`#include <ieeefp.h>`
8			`#include <stdlib.h>`
9			`#include <string.h>`
10			`#define _MAX_CHARS 512`
11
12			`static char *lcset = "0123456789abcdef";`
13
14			`static struct p {`
15			`double pvalue, nvalue;`
16			`int exp;`
17			`} powers[] =`
18			`{`
19			`{ 1e32, 1e-32, 32},`
20			`{ 1e16, 1e-16, 16},`
21			`{ 1e8, 1e-8, 8},`
22			`{ 1e4, 1e-4, 4},`
23			`{ 1e2, 1e-2, 2},`
24			`{ 1e1, 1e-1, 1 },`
25			`{ 1e0, 1e-0, 0 }`
26			`};`
27
28			`#define _MAX_PREC 16`
29
30			`static char`
31			`_DEFUN(nextdigit,(value),`
32			`double *value)`
33			`{`
34			`double tmp;`
35
36			`value = modf (value * 10, &tmp) ;`
37			`return lcset[(int)tmp];`
38			`}`
39
40
41			`static char *`
42			`_DEFUN(print_nan,(buffer, value, precision),`
43			`char *buffer _AND`
44			`double value _AND`
45			`int precision)`
46			`{`
47			`size_t i;`
48
49			`if (isnan(value))`
50			`{`
51			`strcpy(buffer, "nan");`
52			`i = 3;`
53
54			`}`
55			`else`
56			`{`
57			`strcpy(buffer, "infinity");`
58			`i = 8;`
59			`}`
60
61			`while (i < precision)`
62			`{`
63			`buffer[i++] = ' ';`
64			`}`
65			`buffer[i++] = 0;`
66			`return buffer;`
67
68			`}`
69
70			`/* A convert info struct */`
71			`typedef struct`
72			`{`
73			`char buffer ; / Destination of conversion */`
74			`double value; /* scratch Value to convert */`
75			`double original_value; /* saved Value to convert */`
76			`int value_neg; /* OUT: 1 if value initialiy neg */`
77			`int abs_exp; /* abs Decimal exponent of value */`
78			`int abs_exp_sign; /* + or - */`
79			`int exp; /* exp not sgned */`
80			`int type; /* fFeEgG used in printing before exp */`
81
82			`int print_trailing_zeros; /* Print 00's after a . */`
83
84			`int null_idx; /* Index of the null at the end */`
85
86			`/* These ones are read only */`
87			`int decimal_places; /* the number of digits to print after`
88			`the decimal */`
89			`int max_digits; /* total number of digits to print */`
90			`int buffer_size; /* Size of output buffer */`
91
92			`/* Two sorts of dot ness.`
93
94			`1 print a dot if followed by a digit`
95			`2 always print a dot, even if no digit following`
96			`*/`
97			`enum { dot_never, dot_sometimes, dot_always} dot; /* Print a decimal point, always */`
98			`int dot_idx; /* where the dot went, or would have gone */`
99			`} cvt_info_type;`
100
101
102			`void`
103			`_DEFUN(renormalize,(in),`
104			`cvt_info_type *in)`
105			`{`
106
107			`/* Make sure all numbers are less than 1 */`
108
109			`while (in->value >= 1.0)`
110			`{`
111			`in->value = in->value * 0.1;`
112			`in->exp++;`
113			`}`
114
115			`/* Now we have only numbers between 0 and .9999.., and have adjusted`
116			`exp to account for the shift */`
117
118			`if (in->exp >= 0)`
119			`{`
120			`in->abs_exp_sign = '+';`
121			`in->abs_exp = in->exp;`
122			`}`
123			`else`
124			`{`
125			`in->abs_exp_sign = '-';`
126			`in->abs_exp = -in->exp;`
127			`}`
128
129			`}`
130
131			`/* This routine looks at original_value, and makes it between 0 and 1,`
132			`modifying exp as it goes`
133			`*/`
134
135			`static void`
136			`_DEFUN(normalize,(value, in),`
137			`double value _AND`
138			`cvt_info_type *in)`
139			`{`
140			`int j;`
141			`int texp;`
142			`if (value != 0)`
143			`{`
144			`texp = -1;`
145
146
147			`if (value < 0.0)`
148			`{`
149			`in->value_neg =1 ;`
150			`value = - value;`
151			`}`
152			`else`
153			`{`
154			`in->value_neg = 0;`
155			`}`
156
157
158			`/* Work out texponent & normalise value */`
159
160			`/* If value > 1, then shrink it */`
161			`if (value >= 1.0)`
162			`{`
163			`for (j = 0; j < 6; j++)`
164			`{`
165			`while (value >= powers[j].pvalue)`
166			`{`
167			`value /= powers[j].pvalue;`
168			`texp += powers[j].exp;`
169			`}`
170			`}`
171			`}`
172			`else if (value != 0.0)`
173			`{`
174			`for (j = 0; j < 6; j++)`
175			`{`
176			`while (value <= powers[j].nvalue)`
177			`{`
178			`value *= powers[j].pvalue;`
179			`texp -= powers[j].exp;`
180			`}`
181			`}`
182			`}`
183			`}`
184
185			`else`
186			`{`
187			`texp = 0;`
188			`}`
189
190
191			`in->exp = texp;`
192			`in->value = value;`
193			`in->original_value = value;`
194			`renormalize(in);`
195
196			`}`
197			`int`
198			`_DEFUN(round,(in, start, now, ch),`
199			`cvt_info_type *in _AND`
200			`char *start _AND`
201			`char *now _AND`
202			`char ch)`
203			`{`
204			`double rounder = 5.0;`
205
206			`char *p;`
207			`int ok = 0;`
208
209			`now --;`
210
211			`/* If the next digit to output would have been a '5' run back and */`
212			`/* see if we can create a more rounded number. If we can then do it.`
213			`If not (like when the number was 9.9 and the last char was`
214			`another 9), then we'll have to modify the number and try again */`
215			`if (ch < '5')`
216			`return 0;`
217
218
219			`for (p = now;!ok && p >= start; p--)`
220			`{`
221			`switch (*p)`
222			`{`
223			`default:`
224			`abort();`
225			`case '.':`
226			`break;`
227			`case '9':`
228			`rounder = rounder * 0.1;`
229			`break;`
230			`case '8':`
231			`case '7':`
232			`case '6':`
233			`case '5':`
234			`case '4':`
235			`case '3':`
236			`case '2':`
237			`case '1':`
238			`case '0':`
239			`p = now;`
240			`while (1) {`
241			`if (*p == '9') {`
242			`*p = '0';`
243			`}`
244			`else if (*p != '.') {`
245			`(*p)++;`
246			`return 0;`
247			`}`
248			`p--;`
249			`}`
250			`}`
251
252			`}`
253
254			`/* Getting here means that we couldn't round the number in place`
255			`textually - there have been all nines.`
256			`We'll have to add to it and try the conversion again`
257			`eg`
258			`.99999[9] can't be rounded in place, so add`
259			`.000005 to it giving:`
260			`1.000004 we notice that the result is > 1 so add to exp and`
261			`divide by 10`
262			`.100004`
263			`*/`
264
265			`in->original_value = in->value = in->original_value + rounder;`
266			`normalize(in->original_value , in);`
267			`return 1;`
268
269
270			`}`
271
272
273
274			`void`
275			`_DEFUN(_cvte,(in),`
276			`register cvt_info_type *in)`
277			`{`
278			`int buffer_idx =0;`
279			`int digit = 0;`
280
281			`int after_decimal =0;`
282
283			`in->buffer[buffer_idx++] = nextdigit(&(in->value));`
284			`digit++;`
285			`in->dot_idx = buffer_idx;`
286
287
288			`switch (in->dot)`
289			`{`
290			`case dot_never:`
291			`break;`
292			`case dot_sometimes:`
293			`if (in->decimal_places`
294			`&& digit < in->max_digits)`
295			`{`
296			`in->buffer[buffer_idx++] = '.';`
297			`}`
298			`break;`
299			`case dot_always:`
300			`in->buffer[buffer_idx++] = '.';`
301			`}`
302
303
304			`while (buffer_idx < in->buffer_size`
305			`&& after_decimal < in->decimal_places`
306			`&& digit < in->max_digits)`
307			`{`
308			`in->buffer[buffer_idx] = nextdigit(&(in->value));`
309			`after_decimal++;`
310			`buffer_idx++;`
311			`digit++;`
312
313			`}`
314
315			`if (round(in,`
316			`in->buffer,`
317			`in->buffer+buffer_idx,`
318			`nextdigit(&(in->value))))`
319			`{`
320			`_cvte(in);`
321			`}`
322			`else`
323			`{`
324			`in->buffer[buffer_idx++] = in->type;`
325			`in->buffer[buffer_idx++] = in->abs_exp_sign;`
326
327			`if (in->abs_exp >= 100)`
328			`{`
329			`in->buffer[buffer_idx++] = lcset[in->abs_exp / 100];`
330			`in->abs_exp %= 100;`
331			`}`
332			`in->buffer[buffer_idx++] = lcset[in->abs_exp / 10];`
333			`in->buffer[buffer_idx++] = lcset[in->abs_exp % 10];`
334			`}`
335
336			`in->buffer[buffer_idx++] = 0;`
337			`}`
338
339
340
341
342			`/* Produce NNNN.FFFF */`
343			`void`
344			`_DEFUN(_cvtf,(in),`
345			`cvt_info_type *in)`
346			`{`
347
348			`int buffer_idx = 0; /* Current char being output */`
349			`int after_decimal = 0;`
350			`int digit =0;`
351
352
353			`in->dot_idx = in->exp + 1;`
354
355			`/* Two sorts of number, NNN.FFF and 0.0000...FFFF */`
356
357
358			`/* Print all the digits up to the decimal point */`
359
360			`while (buffer_idx <= in->exp`
361			`&& digit < in->max_digits`
362			`&& buffer_idx < in->buffer_size)`
363			`{`
364			`in->buffer[buffer_idx] = nextdigit(&(in->value));`
365			`buffer_idx++;`
366			`digit ++;`
367			`}`
368
369
370			`/* And the decimal point if we should */`
371			`if (buffer_idx < in->buffer_size)`
372			`{`
373
374			`switch (in->dot)`
375			`{`
376			`case dot_never:`
377			`break;`
378			`case dot_sometimes:`
379			`/* Only print a dot if following chars */`
380			`if (in->decimal_places`
381			`&& digit < in->max_digits )`
382			`{`
383			`in->buffer[buffer_idx++] = '.';`
384			`}`
385
386			`break;`
387			`case dot_always:`
388			`in->buffer[buffer_idx++] = '.';`
389			`}`
390
391			`after_decimal = 0;`
392
393			`/* And the digits following the point if necessary */`
394
395			`/* Only print the leading zeros if a dot was possible */`
396			`if (in->dot \|\| in->exp>0)`
397			`{`
398			`while (buffer_idx < in->buffer_size`
399			`&& (in->abs_exp_sign == '-' && digit < in->abs_exp - 1)`
400			`&& (after_decimal < in->decimal_places)`
401			`&& (digit < in->max_digits))`
402			`{`
403			`in->buffer[buffer_idx] = '0';`
404			`buffer_idx++;`
405			`digit++;`
406			`after_decimal++;`
407			`}`
408			`}`
409
410			`while (buffer_idx < in->buffer_size`
411			`&& after_decimal < in->decimal_places`
412			`&& digit < in->max_digits)`
413			`{`
414			`in->buffer[buffer_idx] = nextdigit(&(in->value));`
415			`buffer_idx++;`
416			`digit++;`
417			`after_decimal++;`
418			`}`
419			`}`
420
421			`in->null_idx = buffer_idx;`
422			`in->buffer[buffer_idx] = 0;`
423			`if (round(in, in->buffer, in->buffer+buffer_idx,`
424			`nextdigit(&(in->value))))`
425			`{`
426			`_cvtf(in);`
427			`}`
428
429
430
431
432			`}`
433
434
435
436			`char *`
437			`_DEFUN(_dcvt,(buffer, invalue, precision, width, type, dot),`
438			`char *buffer _AND`
439			`double invalue _AND`
440			`int precision _AND`
441			`int width _AND`
442			`char type _AND`
443			`int dot)`
444			`{`
445			`cvt_info_type in;`
446
447
448
449			`in.buffer = buffer;`
450			`in.buffer_size = 512;`
451
452			`if (!finite(invalue))`
453			`{`
454			`return print_nan(buffer, invalue, precision);`
455			`}`
456
457
458			`normalize(invalue, &in);`
459
460			`in.type = type;`
461			`in.dot = dot? dot_always: dot_sometimes;`
462
463			`switch (type)`
464			`{`
465
466			`case 'g':`
467			`case 'G':`
468			`/* When formatting a g, the precision refers to the number of`
469			`char positions total, this leads to various off by ones */`
470			`{`
471			`/* A precision of 0 means 1 */`
472			`if (precision == 0)`
473			`precision = 1;`
474
475			`/* A g turns into an e if there are more digits than the`
476			`precision, or it's smaller than e-4 */`
477			`if (in.exp >= precision \|\| in.exp < -4)`
478			`{`
479			`in.type = (type == 'g' ? 'e' : 'E');`
480			`in.decimal_places = _MAX_CHARS;`
481			`in.max_digits = precision;`
482			`in.print_trailing_zeros = 1;`
483			`_cvte(&in);`
484			`}`
485			`else`
486			`{`
487			`/* G means total number of chars to print */`
488			`in.decimal_places = _MAX_CHARS;`
489			`in.max_digits = precision;`
490			`in.type = (type == 'g' ? 'f' : 'F');`
491			`in.print_trailing_zeros = 0;`
492			`_cvtf(&in);`
493
494			`if (!dot) {`
495			`/* trim trailing zeros */`
496			`int j = in.null_idx -1;`
497			`while (j > 0 && in.buffer[j] == '0')`
498			`{`
499			`in.buffer[j] = 0;`
500			`j--;`
501			`}`
502			`/* Stamp on a . if not followed by zeros */`
503			`if (j > 0 && buffer[j] == '.')`
504			`in.buffer[j] = 0;`
505			`}`
506			`}`
507
508
509			`break;`
510			`case 'f':`
511			`case 'F':`
512			`in.decimal_places= precision;`
513			`in.max_digits = _MAX_CHARS;`
514			`in.print_trailing_zeros = 1;`
515			`_cvtf(&in);`
516			`break;`
517			`case 'e':`
518			`case 'E':`
519			`in.print_trailing_zeros = 1;`
520			`in.decimal_places = precision;`
521			`in.max_digits = _MAX_CHARS;`
522			`_cvte(&in);`
523			`break;`
524			`}`
525
526			`}`
527
528
529			`return buffer;`
530			`}`
531
532
533
534
535			`char *`
536			`_DEFUN(fcvtbuf,(invalue,ndigit,decpt,sign, fcvt_buf),`
537			`double invalue _AND`
538			`int ndigit _AND`
539			`int *decpt _AND`
540			`int *sign _AND`
541			`char *fcvt_buf)`
542			`{`
543			`cvt_info_type in;`
544			`in.buffer = fcvt_buf;`
545			`in.buffer_size = 512;`
546
547			`if (!finite(invalue))`
548			`{`
549			`return print_nan(fcvt_buf, invalue, ndigit);`
550			`}`
551
552			`normalize(invalue, &in);`
553
554			`in.dot = dot_never; /* Don't print a decimal point */`
555			`in.max_digits = _MAX_CHARS;`
556			`in.buffer_size = _MAX_CHARS; /* Take as many as needed */`
557			`in.decimal_places = ndigit;`
558			`_cvtf(&in);`
559			`*decpt = in.dot_idx;`
560			`*sign = in.value_neg;`
561			`return in.buffer;`
562			`}`
563
564
565			`char *`
566			`_DEFUN(ecvtbuf,(invalue,ndigit,decpt,sign, fcvt_buf),`
567			`double invalue _AND`
568			`int ndigit _AND`
569			`int *decpt _AND`
570			`int *sign _AND`
571			`char *fcvt_buf)`
572			`{`
573			`cvt_info_type in;`
574			`in.buffer = fcvt_buf;`
575
576			`if (!finite(invalue))`
577			`{`
578			`return print_nan(fcvt_buf, invalue, ndigit);`
579			`}`
580
581			`normalize(invalue, &in);`
582
583
584			`in.dot = dot_never; /* Don't print a decimal point */`
585			`/* We can work out how many digits go after the decimal point */`
586
587			`in.buffer_size =_MAX_CHARS;`
588			`in.decimal_places = _MAX_CHARS;`
589			`in.max_digits = ndigit; /* Take as many as told */`
590			`_cvtf(&in);`
591			`*decpt = in.dot_idx;`
592			`*sign = in.value_neg;`
593			`return in.buffer;`
594			`}`
595
596
597
598			`char *`
599			`_DEFUN(gcvt,(d,ndigit,buf),`
600			`double d _AND`
601			`int ndigit _AND`
602			`char *buf)`
603			`{`
604			`return _dcvt(buf, d, ndigit, 0, 'g', 1);`
605			`}`