aboutsummaryrefslogtreecommitdiff
path: root/mysql/sql/my_decimal.h
diff options
context:
space:
mode:
Diffstat (limited to 'mysql/sql/my_decimal.h')
-rw-r--r--mysql/sql/my_decimal.h538
1 files changed, 538 insertions, 0 deletions
diff --git a/mysql/sql/my_decimal.h b/mysql/sql/my_decimal.h
new file mode 100644
index 0000000..d964484
--- /dev/null
+++ b/mysql/sql/my_decimal.h
@@ -0,0 +1,538 @@
+/* Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
+
+ 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 02110-1301 USA */
+
+#ifndef MY_DECIMAL_INCLUDED
+#define MY_DECIMAL_INCLUDED
+
+/**
+ @file
+
+ It is interface module to fixed precision decimals library.
+
+ Most functions use 'uint mask' as parameter, if during operation error
+ which fit in this mask is detected then it will be processed automatically
+ here. (errors are E_DEC_* constants, see include/decimal.h)
+
+ Most function are just inline wrappers around library calls
+*/
+
+#if defined(MYSQL_SERVER) || defined(EMBEDDED_LIBRARY)
+#include "sql_string.h" /* String */
+#endif
+
+C_MODE_START
+#include <decimal.h>
+C_MODE_END
+
+class String;
+typedef struct st_mysql_time MYSQL_TIME;
+
+#define DECIMAL_LONGLONG_DIGITS 22
+#define DECIMAL_LONG_DIGITS 10
+#define DECIMAL_LONG3_DIGITS 8
+
+/** maximum length of buffer in our big digits (uint32). */
+#define DECIMAL_BUFF_LENGTH 9
+
+/* the number of digits that my_decimal can possibly contain */
+#define DECIMAL_MAX_POSSIBLE_PRECISION (DECIMAL_BUFF_LENGTH * 9)
+
+
+/**
+ maximum guaranteed precision of number in decimal digits (number of our
+ digits * number of decimal digits in one our big digit - number of decimal
+ digits in one our big digit decreased by 1 (because we always put decimal
+ point on the border of our big digits))
+*/
+#define DECIMAL_MAX_PRECISION (DECIMAL_MAX_POSSIBLE_PRECISION - 8*2)
+#define DECIMAL_MAX_SCALE 30
+#define DECIMAL_NOT_SPECIFIED 31
+
+/**
+ maximum length of string representation (number of maximum decimal
+ digits + 1 position for sign + 1 position for decimal point, no terminator)
+*/
+#define DECIMAL_MAX_STR_LENGTH (DECIMAL_MAX_POSSIBLE_PRECISION + 2)
+
+/**
+ maximum size of packet length.
+*/
+#define DECIMAL_MAX_FIELD_SIZE DECIMAL_MAX_PRECISION
+
+
+inline uint my_decimal_size(uint precision, uint scale)
+{
+ /*
+ Always allocate more space to allow library to put decimal point
+ where it want
+ */
+ return decimal_size(precision, scale) + 1;
+}
+
+
+inline int my_decimal_int_part(uint precision, uint decimals)
+{
+ return precision - ((decimals == DECIMAL_NOT_SPECIFIED) ? 0 : decimals);
+}
+
+
+/**
+ my_decimal class limits 'decimal_t' type to what we need in MySQL.
+
+ It contains internally all necessary space needed by the instance so
+ no extra memory is needed. Objects should be moved using copy CTOR
+ or assignment operator, rather than memcpy/memmove.
+*/
+
+class my_decimal :public decimal_t
+{
+ /*
+ Several of the routines in strings/decimal.c have had buffer
+ overrun/underrun problems. These are *not* caught by valgrind.
+ To catch them, we allocate dummy fields around the buffer,
+ and test that their values do not change.
+ */
+#if !defined(DBUG_OFF)
+ int foo1;
+#endif
+
+ decimal_digit_t buffer[DECIMAL_BUFF_LENGTH];
+
+#if !defined(DBUG_OFF)
+ int foo2;
+ static const int test_value= 123;
+#endif
+
+public:
+
+ my_decimal(const my_decimal &rhs) : decimal_t(rhs)
+ {
+ rhs.sanity_check();
+#if !defined(DBUG_OFF)
+ foo1= test_value;
+ foo2= test_value;
+#endif
+ for (uint i= 0; i < DECIMAL_BUFF_LENGTH; i++)
+ buffer[i]= rhs.buffer[i];
+ buf= buffer;
+ }
+
+ my_decimal& operator=(const my_decimal &rhs)
+ {
+ sanity_check();
+ rhs.sanity_check();
+ if (this == &rhs)
+ return *this;
+ decimal_t::operator=(rhs);
+ for (uint i= 0; i < DECIMAL_BUFF_LENGTH; i++)
+ buffer[i]= rhs.buffer[i];
+ buf= buffer;
+ return *this;
+ }
+
+ void init()
+ {
+#if !defined(DBUG_OFF)
+ foo1= test_value;
+ foo2= test_value;
+#endif
+ /*
+ Do not initialize more of the base class,
+ we want to catch uninitialized use.
+ */
+ len= DECIMAL_BUFF_LENGTH;
+ buf= buffer;
+ }
+
+ my_decimal()
+ {
+ init();
+ }
+ ~my_decimal()
+ {
+ sanity_check();
+ }
+
+ void sanity_check() const
+ {
+ DBUG_ASSERT(foo1 == test_value);
+ DBUG_ASSERT(foo2 == test_value);
+ DBUG_ASSERT(buf == buffer);
+ }
+
+ bool sign() const { return decimal_t::sign; }
+ void sign(bool s) { decimal_t::sign= s; }
+ uint precision() const { return intg + frac; }
+
+ /** Swap two my_decimal values */
+ void swap(my_decimal &rhs)
+ {
+ swap_variables(my_decimal, *this, rhs);
+ }
+
+ // Error reporting in server code only.
+ int check_result(uint mask, int result) const
+#ifdef MYSQL_CLIENT
+ {
+ return result;
+ }
+#endif
+ ;
+};
+
+
+#ifndef DBUG_OFF
+void print_decimal(const my_decimal *dec);
+void print_decimal_buff(const my_decimal *dec, const uchar* ptr, int length);
+const char *dbug_decimal_as_string(char *buff, const my_decimal *val);
+#else
+#define dbug_decimal_as_string(A) NULL
+#endif
+
+bool str_set_decimal(uint mask, const my_decimal *val, uint fixed_prec,
+ uint fixed_dec, char filler, String *str,
+ const CHARSET_INFO *cs);
+
+extern my_decimal decimal_zero;
+
+
+inline
+void max_my_decimal(my_decimal *to, int precision, int frac)
+{
+ DBUG_ASSERT((precision <= DECIMAL_MAX_PRECISION)&&
+ (frac <= DECIMAL_MAX_SCALE));
+ max_decimal(precision, frac, to);
+}
+
+inline void max_internal_decimal(my_decimal *to)
+{
+ max_my_decimal(to, DECIMAL_MAX_PRECISION, 0);
+}
+
+inline int check_result_and_overflow(uint mask, int result, my_decimal *val)
+{
+ if (val->check_result(mask, result) & E_DEC_OVERFLOW)
+ {
+ bool sign= val->sign();
+ val->sanity_check();
+ max_internal_decimal(val);
+ val->sign(sign);
+ }
+ /*
+ Avoid returning negative zero, cfr. decimal_cmp()
+ For result == E_DEC_DIV_ZERO *val has not been assigned.
+ */
+ if (result != E_DEC_DIV_ZERO && val->sign() && decimal_is_zero(val))
+ val->sign(false);
+ return result;
+}
+
+inline uint my_decimal_length_to_precision(uint length, uint scale,
+ bool unsigned_flag)
+{
+ /* Precision can't be negative thus ignore unsigned_flag when length is 0. */
+ DBUG_ASSERT(length || !scale);
+ uint retval= (uint) (length - (scale>0 ? 1:0) -
+ (unsigned_flag || !length ? 0:1));
+ return retval;
+}
+
+inline uint32 my_decimal_precision_to_length_no_truncation(uint precision,
+ uint8 scale,
+ bool unsigned_flag)
+{
+ /*
+ When precision is 0 it means that original length was also 0. Thus
+ unsigned_flag is ignored in this case.
+ */
+ DBUG_ASSERT(precision || !scale);
+ uint32 retval= (uint32)(precision + (scale > 0 ? 1 : 0) +
+ (unsigned_flag || !precision ? 0 : 1));
+ return retval;
+}
+
+inline uint32 my_decimal_precision_to_length(uint precision, uint8 scale,
+ bool unsigned_flag)
+{
+ /*
+ When precision is 0 it means that original length was also 0. Thus
+ unsigned_flag is ignored in this case.
+ */
+ DBUG_ASSERT(precision || !scale);
+ set_if_smaller(precision, DECIMAL_MAX_PRECISION);
+ return my_decimal_precision_to_length_no_truncation(precision, scale,
+ unsigned_flag);
+}
+
+inline
+int my_decimal_string_length(const my_decimal *d)
+{
+ /* length of string representation including terminating '\0' */
+ return decimal_string_size(d);
+}
+
+
+inline
+int my_decimal_max_length(const my_decimal *d)
+{
+ /* -1 because we do not count \0 */
+ return decimal_string_size(d) - 1;
+}
+
+
+inline
+int my_decimal_get_binary_size(uint precision, uint scale)
+{
+ return decimal_bin_size((int)precision, (int)scale);
+}
+
+
+inline
+void my_decimal2decimal(const my_decimal *from, my_decimal *to)
+{
+ *to= *from;
+}
+
+
+int my_decimal2binary(uint mask, const my_decimal *d, uchar *bin, int prec,
+ int scale);
+
+
+inline
+int binary2my_decimal(uint mask, const uchar *bin, my_decimal *d, int prec,
+ int scale)
+{
+ return d->check_result(mask, bin2decimal(bin, d, prec, scale));
+}
+
+
+inline
+int my_decimal_set_zero(my_decimal *d)
+{
+ /*
+ We need the up-cast here, since my_decimal has sign() member functions,
+ which conflicts with decimal_t::size
+ (and decimal_make_zero is a macro, rather than a funcion).
+ */
+ decimal_make_zero(static_cast<decimal_t*>(d));
+ return 0;
+}
+
+
+inline
+bool my_decimal_is_zero(const my_decimal *decimal_value)
+{
+ return decimal_is_zero(decimal_value);
+}
+
+
+inline
+int my_decimal_round(uint mask, const my_decimal *from, int scale,
+ bool truncate, my_decimal *to)
+{
+ return
+ from->check_result(mask, decimal_round(from, to, scale,
+ (truncate ? TRUNCATE : HALF_UP)));
+}
+
+
+inline
+int my_decimal_floor(uint mask, const my_decimal *from, my_decimal *to)
+{
+ return from->check_result(mask, decimal_round(from, to, 0, FLOOR));
+}
+
+
+inline
+int my_decimal_ceiling(uint mask, const my_decimal *from, my_decimal *to)
+{
+ return from->check_result(mask, decimal_round(from, to, 0, CEILING));
+}
+
+
+inline bool str_set_decimal(const my_decimal *val, String *str,
+ const CHARSET_INFO *cs)
+{
+ return str_set_decimal(E_DEC_FATAL_ERROR, val, 0, 0, 0, str, cs);
+}
+
+#ifndef MYSQL_CLIENT
+class String;
+int my_decimal2string(uint mask, const my_decimal *d, uint fixed_prec,
+ uint fixed_dec, char filler, String *str);
+#endif
+
+inline
+int my_decimal2int(uint mask, const my_decimal *d, my_bool unsigned_flag,
+ longlong *l)
+{
+ my_decimal rounded;
+ /* decimal_round can return only E_DEC_TRUNCATED */
+ decimal_round(d, &rounded, 0, HALF_UP);
+ return d->check_result(mask, (unsigned_flag ?
+ decimal2ulonglong(&rounded, (ulonglong *)l) :
+ decimal2longlong(&rounded, l)));
+}
+
+
+inline
+int my_decimal2double(uint, const my_decimal *d, double *result)
+{
+ /* No need to call check_result as this will always succeed */
+ return decimal2double(d, result);
+}
+
+
+inline int my_decimal2lldiv_t(uint mask, const my_decimal *d, lldiv_t *to)
+{
+ return d->check_result(mask, decimal2lldiv_t(d, to));
+}
+
+
+inline int str2my_decimal(uint mask, const char *str,
+ my_decimal *d, char **end)
+{
+ return check_result_and_overflow(mask, string2decimal(str, d, end), d);
+}
+
+
+int str2my_decimal(uint mask, const char *from, size_t length,
+ const CHARSET_INFO *charset, my_decimal *decimal_value);
+
+#if defined(MYSQL_SERVER) || defined(EMBEDDED_LIBRARY)
+inline
+int string2my_decimal(uint mask, const String *str, my_decimal *d)
+{
+ return str2my_decimal(mask, str->ptr(), (uint)str->length(), str->charset(), d);
+}
+
+
+my_decimal *date2my_decimal(const MYSQL_TIME *ltime, my_decimal *dec);
+my_decimal *time2my_decimal(const MYSQL_TIME *ltime, my_decimal *dec);
+my_decimal *timeval2my_decimal(const struct timeval *tm, my_decimal *dec);
+
+#endif /*defined(MYSQL_SERVER) || defined(EMBEDDED_LIBRARY) */
+
+inline
+int double2my_decimal(uint mask, double val, my_decimal *d)
+{
+ return check_result_and_overflow(mask, double2decimal(val, d), d);
+}
+
+
+inline
+int int2my_decimal(uint mask, longlong i, my_bool unsigned_flag, my_decimal *d)
+{
+ return d->check_result(mask, (unsigned_flag ?
+ ulonglong2decimal((ulonglong)i, d) :
+ longlong2decimal(i, d)));
+}
+
+
+inline
+void my_decimal_neg(decimal_t *arg)
+{
+ // Avoid returning negative zero, cfr. decimal_cmp()
+ if (decimal_is_zero(arg))
+ {
+ arg->sign= 0;
+ return;
+ }
+ arg->sign^= 1;
+}
+
+
+inline
+int my_decimal_add(uint mask, my_decimal *res, const my_decimal *a,
+ const my_decimal *b)
+{
+ return check_result_and_overflow(mask,
+ decimal_add(a, b, res),
+ res);
+}
+
+
+inline
+int my_decimal_sub(uint mask, my_decimal *res, const my_decimal *a,
+ const my_decimal *b)
+{
+ return check_result_and_overflow(mask,
+ decimal_sub(a, b, res),
+ res);
+}
+
+
+inline
+int my_decimal_mul(uint mask, my_decimal *res, const my_decimal *a,
+ const my_decimal *b)
+{
+ return check_result_and_overflow(mask,
+ decimal_mul(a, b, res),
+ res);
+}
+
+
+inline
+int my_decimal_div(uint mask, my_decimal *res, const my_decimal *a,
+ const my_decimal *b, int div_scale_inc)
+{
+ return check_result_and_overflow(mask,
+ decimal_div(a, b, res, div_scale_inc),
+ res);
+}
+
+
+inline
+int my_decimal_mod(uint mask, my_decimal *res, const my_decimal *a,
+ const my_decimal *b)
+{
+ return check_result_and_overflow(mask,
+ decimal_mod(a, b, res),
+ res);
+}
+
+
+/**
+ @return
+ -1 if a<b, 1 if a>b and 0 if a==b
+*/
+inline
+int my_decimal_cmp(const my_decimal *a, const my_decimal *b)
+{
+ return decimal_cmp(a, b);
+}
+
+inline
+bool operator<(const my_decimal &lhs, const my_decimal &rhs)
+{
+ return my_decimal_cmp(&lhs, &rhs) < 0;
+}
+
+inline
+bool operator!=(const my_decimal &lhs, const my_decimal &rhs)
+{
+ return my_decimal_cmp(&lhs, &rhs) != 0;
+}
+
+inline
+int my_decimal_intg(const my_decimal *a)
+{
+ return decimal_intg(a);
+}
+
+
+void my_decimal_trim(ulong *precision, uint *scale);
+
+#endif // MY_DECIMAL_INCLUDED
generated by cgit v1.1 at 2024-04-24 00:05:25 +0000