summaryrefslogtreecommitdiffstats
path: root/sql/my_decimal.cc
blob: 54b038ccb2d2518dbd2ce67e74ba001c176bd356 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
/*
   Copyright (c) 2005, 2010, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */

#include "mariadb.h"
#include "sql_priv.h"
#include <time.h>

#ifndef MYSQL_CLIENT
#include "sql_class.h"                          // THD
#include "field.h"
#endif

#define DIG_BASE     1000000000
#define DIG_PER_DEC1 9
#define ROUND_UP(X)  (((X)+DIG_PER_DEC1-1)/DIG_PER_DEC1)

#ifndef MYSQL_CLIENT
/**
  report result of decimal operation.

  @param result  decimal library return code (E_DEC_* see include/decimal.h)

  @todo
    Fix error messages

  @return
    result
*/

int decimal_operation_results(int result, const char *value, const char *type)
{
  /* Avoid calling current_thd on default path */
  if (likely(result == E_DEC_OK))
    return(result);
  
  THD *thd= current_thd;
  switch (result) {
  case E_DEC_TRUNCATED:
    push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
			ER_DATA_TRUNCATED, ER_THD(thd, ER_DATA_TRUNCATED),
			value, type);
    break;
  case E_DEC_OVERFLOW:
    push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
                        ER_DATA_OVERFLOW, ER_THD(thd, ER_DATA_OVERFLOW),
			value, type);
    break;
  case E_DEC_DIV_ZERO:
    push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
			ER_DIVISION_BY_ZERO, ER_THD(thd, ER_DIVISION_BY_ZERO));
    break;
  case E_DEC_BAD_NUM:
    push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
			ER_BAD_DATA, ER_THD(thd, ER_BAD_DATA),
			value, type);
    break;
  case E_DEC_OOM:
    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    break;
  default:
    DBUG_ASSERT(0);
  }
  return result;
}


/**
  @brief Converting decimal to string

  @details Convert given my_decimal to String; allocate buffer as needed.

  @param[in]   mask        what problems to warn on (mask of E_DEC_* values)
  @param[in]   d           the decimal to print
  @param[in]   fixed_prec  overall number of digits if ZEROFILL, 0 otherwise
  @param[in]   fixed_dec   number of decimal places (if fixed_prec != 0)
  @param[in]   filler      what char to pad with (ZEROFILL et al.)
  @param[out]  *str        where to store the resulting string

  @return error coce
    @retval E_DEC_OK
    @retval E_DEC_TRUNCATED
    @retval E_DEC_OVERFLOW
    @retval E_DEC_OOM
*/

int my_decimal::to_string_native(String *str, uint fixed_prec, uint fixed_dec,
                                 char filler, uint mask) const
{
  /*
    Calculate the size of the string: For DECIMAL(a,b), fixed_prec==a
    holds true iff the type is also ZEROFILL, which in turn implies
    UNSIGNED. Hence the buffer for a ZEROFILLed value is the length
    the user requested, plus one for a possible decimal point, plus
    one if the user only wanted decimal places, but we force a leading
    zero on them, plus one for the '\0' terminator. Because the type
    is implicitly UNSIGNED, we do not need to reserve a character for
    the sign. For all other cases, fixed_prec will be 0, and
    my_decimal_string_length() will be called instead to calculate the
    required size of the buffer.
  */
  int length= (fixed_prec
               ? (fixed_prec + ((fixed_prec == fixed_dec) ? 1 : 0) + 1)
               : my_decimal_string_length(this));
  int result;
  if (str->alloc(length+1))                     // Alloc also space for \0
    return check_result(mask, E_DEC_OOM);
  result= decimal2string(this, (char*) str->ptr(),
                         &length, (int)fixed_prec, fixed_dec,
                         filler);
  str->length(length);
  str->set_charset(&my_charset_numeric);
  return check_result(mask, result);
}


/**
  @brief Converting decimal to string with character set conversion

  @details Convert given my_decimal to String; allocate buffer as needed.

  @param[in]   mask        what problems to warn on (mask of E_DEC_* values)
  @param[in]   val         the decimal to print
  @param[in]   fixed_prec  overall number of digits if ZEROFILL, 0 otherwise
  @param[in]   fixed_dec   number of decimal places (if fixed_prec != 0)
  @param[in]   filler      what char to pad with (ZEROFILL et al.)
  @param[out]  *str        where to store the resulting string
  @param[in]   cs          character set

  @return error coce
    @retval E_DEC_OK
    @retval E_DEC_TRUNCATED
    @retval E_DEC_OVERFLOW
    @retval E_DEC_OOM

  Would be great to make it a method of the String class,
  but this would need to include
  my_decimal.h from sql_string.h and sql_string.cc, which is not desirable.
*/
bool
str_set_decimal(uint mask, const my_decimal *val,
                uint fixed_prec, uint fixed_dec, char filler,
                String *str, CHARSET_INFO *cs)
{
  if (!(cs->state & MY_CS_NONASCII))
  {
    // For ASCII-compatible character sets we can use to_string_native()
    val->to_string_native(str, fixed_prec, fixed_dec, filler, mask);
    str->set_charset(cs);
    return FALSE;
  }
  else
  {
    /*
      For ASCII-incompatible character sets (like UCS2) we
      call my_string_native() on a temporary buffer first,
      and then convert the result to the target character
      with help of str->copy().
    */
    uint errors;
    StringBuffer<DECIMAL_MAX_STR_LENGTH> tmp;
    val->to_string_native(&tmp, fixed_prec, fixed_dec, filler, mask);
    return str->copy(tmp.ptr(), tmp.length(), &my_charset_latin1, cs, &errors);
  }
}


/*
  Convert from decimal to binary representation

  SYNOPSIS
    to_binary()
    mask        error processing mask
    d           number for conversion
    bin         pointer to buffer where to write result
    prec        overall number of decimal digits
    scale       number of decimal digits after decimal point

  NOTE
    Before conversion we round number if it need but produce truncation
    error in this case

  RETURN
    E_DEC_OK
    E_DEC_TRUNCATED
    E_DEC_OVERFLOW
*/

int my_decimal::to_binary(uchar *bin, int prec, decimal_digits_t scale,
                          uint mask) const
{
  int err1= E_DEC_OK, err2;
  my_decimal rounded;
  my_decimal2decimal(this, &rounded);
  rounded.frac= decimal_actual_fraction(&rounded);
  if (scale < rounded.frac)
  {
    err1= E_DEC_TRUNCATED;
    /* decimal_round can return only E_DEC_TRUNCATED */
    decimal_round(&rounded, &rounded, scale, HALF_UP);
  }
  err2= decimal2bin(&rounded, bin, prec, scale);
  if (!err2)
    err2= err1;
  return check_result(mask, err2);
}


/*
  Convert string for decimal when string can be in some multibyte charset

  SYNOPSIS
    str2my_decimal()
    mask            error processing mask
    from            string to process
    length          length of given string
    charset         charset of given string
    decimal_value   buffer for result storing

  RESULT
    E_DEC_OK
    E_DEC_TRUNCATED
    E_DEC_OVERFLOW
    E_DEC_BAD_NUM
    E_DEC_OOM
*/

int str2my_decimal(uint mask, const char *from, size_t length,
                   CHARSET_INFO *charset, my_decimal *decimal_value,
                   const char **end_ptr)
{
  int err;
  if (charset->mbminlen > 1)
  {
    StringBuffer<STRING_BUFFER_USUAL_SIZE> tmp;
    uint dummy_errors;
    tmp.copy(from, length, charset, &my_charset_latin1, &dummy_errors);
    char *end= (char*) tmp.end();
    err= string2decimal(tmp.ptr(), (decimal_t*) decimal_value, &end);
    *end_ptr= from + charset->mbminlen * (size_t) (end - tmp.ptr());
  }
  else
  {
    char *end= (char*) from + length;
    err= string2decimal(from, (decimal_t*) decimal_value, &end);
    *end_ptr= end;
  }
  check_result_and_overflow(mask, err, decimal_value);
  return err;
}


/**
  converts a decimal into a pair of integers - for integer and fractional parts

  special version, for decimals representing number of seconds.
  integer part cannot be larger that 1e18 (otherwise it's an overflow).
  fractional part is microseconds.
*/
bool my_decimal2seconds(const my_decimal *d, ulonglong *sec,
                        ulong *microsec, ulong *nanosec)
{
  int pos;
  
  if (d->intg)
  {
    pos= (d->intg-1)/DIG_PER_DEC1;
    *sec= d->buf[pos];
    if (pos > 0)
      *sec+= static_cast<longlong>(d->buf[pos-1]) * DIG_BASE;
  }
  else
  {
    *sec=0;
    pos= -1;
  }

  *microsec= d->frac ? static_cast<longlong>(d->buf[pos+1]) / (DIG_BASE/1000000) : 0;
  *nanosec=  d->frac ? static_cast<longlong>(d->buf[pos+1]) % (DIG_BASE/1000000) : 0;

  if (pos > 1)
  {
    for (int i=0; i < pos-1; i++)
      if (d->buf[i])
      {
        *sec= LONGLONG_MAX;
        break;
      }
  }
  return d->sign();
}


/**
  converts a pair of integers (seconds, microseconds) into a decimal
*/
my_decimal *seconds2my_decimal(bool sign,
                               ulonglong sec, ulong microsec, my_decimal *d)
{
  d->init();
  longlong2decimal(sec, d); // cannot fail
  if (microsec)
  {
    d->buf[(d->intg-1) / DIG_PER_DEC1 + 1]= microsec * (DIG_BASE/1000000);
    d->frac= 6;
  }
  ((decimal_t *)d)->sign= sign;
  return d;
}


my_decimal *date2my_decimal(const MYSQL_TIME *ltime, my_decimal *dec)
{
  longlong date= (ltime->year*100L + ltime->month)*100L + ltime->day;
  if (ltime->time_type > MYSQL_TIMESTAMP_DATE)
    date= ((date*100L + ltime->hour)*100L+ ltime->minute)*100L + ltime->second;
  return seconds2my_decimal(ltime->neg, date, ltime->second_part, dec);
}


void my_decimal_trim(ulonglong *precision, decimal_digits_t *scale)
{
  if (!(*precision) && !(*scale))
  {
    *precision= 10;
    *scale= 0;
    return;
  }
}


/*
  Convert a decimal to an ulong with a descriptive error message
*/

int my_decimal2int(uint mask, const decimal_t *d, bool unsigned_flag,
		   longlong *l, decimal_round_mode round_type)
{
  int res;
  my_decimal rounded;
  /* decimal_round can return only E_DEC_TRUNCATED */
  decimal_round(d, &rounded, 0, round_type);
  res= (unsigned_flag ?
        decimal2ulonglong(&rounded, (ulonglong *) l) :
        decimal2longlong(&rounded, l));
  if (res & mask)
  {
    char buff[DECIMAL_MAX_STR_LENGTH];
    int length= sizeof(buff);
    decimal2string(d, buff, &length, 0, 0, 0);

    decimal_operation_results(res, buff,
                              unsigned_flag ? "UNSIGNED INT" :
                              "INT");
  }
  return res;
}


longlong my_decimal::to_longlong(bool unsigned_flag) const
{
  longlong result;
  my_decimal2int(E_DEC_FATAL_ERROR, this, unsigned_flag, &result);
  return result;
}


my_decimal::my_decimal(Field *field)
{
  init();
  DBUG_ASSERT(!field->is_null());
#ifdef DBUG_ASSERT_EXISTS
  my_decimal *dec=
#endif
  field->val_decimal(this);
  DBUG_ASSERT(dec == this);
}


#ifndef DBUG_OFF
/* routines for debugging print */

/* print decimal */
void
print_decimal(const my_decimal *dec)
{
  int i, end;
  char buff[512], *pos;
  pos= buff;
  pos+= sprintf(buff, "Decimal: sign: %d  intg: %d  frac: %d  { ",
                dec->sign(), dec->intg, dec->frac);
  end= ROUND_UP(dec->frac)+ROUND_UP(dec->intg)-1;
  for (i=0; i < end; i++)
    pos+= sprintf(pos, "%09d, ", dec->buf[i]);
  pos+= sprintf(pos, "%09d }\n", dec->buf[i]);
  fputs(buff, DBUG_FILE);
}


/* print decimal with its binary representation */
void
print_decimal_buff(const my_decimal *dec, const uchar* ptr, int length)
{
  print_decimal(dec);
  fprintf(DBUG_FILE, "Record: ");
  for (int i= 0; i < length; i++)
  {
    fprintf(DBUG_FILE, "%02X ", (uint)((uchar *)ptr)[i]);
  }
  fprintf(DBUG_FILE, "\n");
}


const char *dbug_decimal_as_string(char *buff, const my_decimal *val)
{
  int length= DECIMAL_MAX_STR_LENGTH + 1;     /* minimum size for buff */
  if (!val)
    return "NULL";
  (void)decimal2string((decimal_t*) val, buff, &length, 0,0,0);
  return buff;
}


#endif /*DBUG_OFF*/
#endif /*MYSQL_CLIENT*/