arbitrary precision decimal numbers

.bzrignore

@@ -920,3 +920,4 @@ vio/test-ssl
 vio/test-sslclient
 vio/test-sslserver
 vio/viotest-ssl
+strings/test_decimal

include/decimal.h

+/* Copyright (C) 2000 MySQL AB
+
+   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; either version 2 of the License, or
+   (at your option) any later version.
+
+   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef _decimal_h
+#define _decimal_h
+
+#include <my_global.h>
+#include <m_ctype.h>
+#include <my_sys.h> /* for my_alloca */
+
+typedef enum {TRUNCATE=0, EVEN} dec_round_mode;
+typedef uint32 decimal_digit;
+
+typedef struct st_decimal {
+  int     intg, frac, len;
+  my_bool sign;
+  decimal_digit *buf;
+} decimal;
+
+int decimal2string(decimal *from, char *to, uint *to_len);
+int string2decimal(char *from, decimal *to, char **end);
+int decimal2ulonglong(decimal *from, ulonglong *to);
+int ulonglong2decimal(ulonglong from, decimal *to);
+int decimal2longlong(decimal *from, longlong *to);
+int longlong2decimal(longlong from, decimal *to);
+int decimal2double(decimal *from, double *to);
+int double2decimal(double from, decimal *to);
+
+int decimal_add(decimal *from1, decimal *from2, decimal *to);
+int decimal_sub(decimal *from1, decimal *from2, decimal *to);
+int decimal_mul(decimal *from1, decimal *from2, decimal *to);
+int decimal_div(decimal *from1, decimal *from2, decimal *to, int scale_incr);
+int decimal_mod(decimal *from1, decimal *from2, decimal *to);
+int decimal_result_size(decimal *from1, decimal *from2, char op, int param);
+int decimal_round(decimal *dec, int new_scale, dec_round_mode mode);
+
+/*
+  conventions:
+
+    decimal_smth() == 0     -- everything's ok
+    decimal_smth() <= 0     -- result is usable, precision loss is possible
+    decimal_smth() <= 1     -- result is unusable, but most significant digits
+                               can be lost
+    decimal_smth() >  1     -- no result was generated
+*/
+
+#define E_DEC_TRUNCATED        -1
+#define E_DEC_OK                0
+#define E_DEC_OVERFLOW          1
+#define E_DEC_DIV_ZERO          2
+#define E_DEC_BAD_NUM           3
+#define E_DEC_OOM               4
+
+#endif
+

strings/Makefile.am

@@ -22,19 +22,19 @@ pkglib_LIBRARIES =	libmystrings.a
 # Exact one of ASSEMBLER_X
 if ASSEMBLER_x86
 ASRCS		= strings-x86.s longlong2str-x86.s my_strtoll10-x86.s
-CSRCS		= bfill.c bmove.c bmove512.c bchange.c strxnmov.c int2str.c str2int.c r_strinstr.c strtod.c bcmp.c strtol.c strtoul.c strtoll.c strtoull.c llstr.c strnlen.c ctype.c ctype-simple.c ctype-mb.c ctype-big5.c ctype-czech.c ctype-euc_kr.c ctype-gb2312.c ctype-gbk.c ctype-sjis.c ctype-tis620.c ctype-ujis.c ctype-utf8.c ctype-ucs2.c ctype-uca.c ctype-win1250ch.c ctype-bin.c ctype-latin1.c my_vsnprintf.c xml.c ctype-extra.c
+CSRCS		= bfill.c bmove.c bmove512.c bchange.c strxnmov.c int2str.c str2int.c r_strinstr.c strtod.c bcmp.c strtol.c strtoul.c strtoll.c strtoull.c llstr.c strnlen.c ctype.c ctype-simple.c ctype-mb.c ctype-big5.c ctype-czech.c ctype-euc_kr.c ctype-gb2312.c ctype-gbk.c ctype-sjis.c ctype-tis620.c ctype-ujis.c ctype-utf8.c ctype-ucs2.c ctype-uca.c ctype-win1250ch.c ctype-bin.c ctype-latin1.c my_vsnprintf.c xml.c decimal.c ctype-extra.c
 else
 if ASSEMBLER_sparc32
 # These file MUST all be on the same line!! Otherwise automake
 # generats a very broken makefile
 ASRCS		= bmove_upp-sparc.s strappend-sparc.s strend-sparc.s strinstr-sparc.s strmake-sparc.s strmov-sparc.s strnmov-sparc.s strstr-sparc.s
-CSRCS		= strcont.c strfill.c strcend.c is_prefix.c longlong2str.c bfill.c bmove.c bmove512.c bchange.c strxnmov.c int2str.c str2int.c r_strinstr.c strtod.c bcmp.c strtol.c strtoul.c strtoll.c strtoull.c llstr.c strnlen.c strxmov.c ctype.c ctype-simple.c ctype-mb.c ctype-big5.c ctype-czech.c ctype-euc_kr.c ctype-gb2312.c ctype-gbk.c ctype-sjis.c ctype-tis620.c ctype-ujis.c ctype-utf8.c ctype-ucs2.c ctype-uca.c ctype-win1250ch.c ctype-bin.c ctype-latin1.c my_vsnprintf.c xml.c ctype-extra.c my_strtoll10.c
+CSRCS		= strcont.c strfill.c strcend.c is_prefix.c longlong2str.c bfill.c bmove.c bmove512.c bchange.c strxnmov.c int2str.c str2int.c r_strinstr.c strtod.c bcmp.c strtol.c strtoul.c strtoll.c strtoull.c llstr.c strnlen.c strxmov.c ctype.c ctype-simple.c ctype-mb.c ctype-big5.c ctype-czech.c ctype-euc_kr.c ctype-gb2312.c ctype-gbk.c ctype-sjis.c ctype-tis620.c ctype-ujis.c ctype-utf8.c ctype-ucs2.c ctype-uca.c ctype-win1250ch.c ctype-bin.c ctype-latin1.c my_vsnprintf.c xml.c decimal.c ctype-extra.c my_strtoll10.c
 else
 #no assembler
 ASRCS		=
 # These file MUST all be on the same line!! Otherwise automake
 # generats a very broken makefile
-CSRCS		= strxmov.c bmove_upp.c strappend.c strcont.c strend.c strfill.c strcend.c is_prefix.c strstr.c strinstr.c strmake.c strnmov.c strmov.c longlong2str.c bfill.c bmove.c bmove512.c bchange.c strxnmov.c int2str.c str2int.c r_strinstr.c strtod.c bcmp.c strtol.c strtoul.c strtoll.c strtoull.c llstr.c strnlen.c ctype.c ctype-simple.c ctype-mb.c ctype-big5.c ctype-czech.c ctype-euc_kr.c ctype-gb2312.c ctype-gbk.c ctype-sjis.c ctype-tis620.c ctype-ujis.c ctype-utf8.c ctype-ucs2.c ctype-uca.c ctype-win1250ch.c ctype-bin.c ctype-latin1.c my_vsnprintf.c xml.c ctype-extra.c my_strtoll10.c
+CSRCS		= strxmov.c bmove_upp.c strappend.c strcont.c strend.c strfill.c strcend.c is_prefix.c strstr.c strinstr.c strmake.c strnmov.c strmov.c longlong2str.c bfill.c bmove.c bmove512.c bchange.c strxnmov.c int2str.c str2int.c r_strinstr.c strtod.c bcmp.c strtol.c strtoul.c strtoll.c strtoull.c llstr.c strnlen.c ctype.c ctype-simple.c ctype-mb.c ctype-big5.c ctype-czech.c ctype-euc_kr.c ctype-gb2312.c ctype-gbk.c ctype-sjis.c ctype-tis620.c ctype-ujis.c ctype-utf8.c ctype-ucs2.c ctype-uca.c ctype-win1250ch.c ctype-bin.c ctype-latin1.c my_vsnprintf.c xml.c decimal.c ctype-extra.c my_strtoll10.c
 endif
 endif
 
@@ -45,7 +45,7 @@ DISTCLEANFILES = ctype_autoconf.c
 EXTRA_DIST =		ctype-big5.c ctype-czech.c ctype-euc_kr.c ctype-win1250ch.c \
 			ctype-gb2312.c ctype-gbk.c ctype-sjis.c ctype-utf8.c \
 			ctype-ucs2.c ctype-uca.c ctype-tis620.c ctype-ujis.c \
-                        xml.c strto.c strings-x86.s \
+			xml.c decimal.c strto.c strings-x86.s \
 			longlong2str.c longlong2str-x86.s \
 			my_strtoll10.c my_strtoll10-x86.s \
 			strxmov.c bmove_upp.c strappend.c strcont.c strend.c \
@@ -73,8 +73,17 @@ if ASSEMBLER
 	$(AS) $(ASFLAGS) -o $@ $<
 endif
 
+FLAGS=$(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) @NOINST_LDFLAGS@
+LIBS=libmystrings.a
+
 str_test: str_test.c $(LIBRARIES)
-	$(LINK) $(FLAGS) -DMAIN $INCLUDES $(srcdir)/str_test.c $(LDADD) $(LIBS) $(pkglib_LIBRARIES)
+	$(LINK) $(FLAGS) -DMAIN $(INCLUDES) $(srcdir)/str_test.c $(LDADD) $(LIBS) $(pkglib_LIBRARIES)
+
+test_decimal$(EXEEXT): decimal.c $(LIBRARIES)
+	$(CP) $(srcdir)/decimal.c ./test_decimal.c
+	$(LINK) $(FLAGS) -DMAIN  ./test_decimal.c $(LDADD) $(LIBS)
+	$(RM) -f ./test_decimal.c
 
 # Don't update the files from bitkeeper
 %::SCCS/s.%
+

strings/llstr.c

@@ -30,6 +30,6 @@
 
 char *llstr(longlong value,char *buff)
 {
-  longlong2str(value,buff,-10);
+  longlong10_to_str(value,buff,-10);
   return buff;
 }