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Overview
Comment:Merge overflow and rounding fixes for sqlite4_num_to_int64().
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SHA1: e8db1e81a4d3020ea8a2913534d2963d53dca484
User & Date: dan 2013-06-03 15:23:11
Context
2013-06-03
19:25
Remove the use of type 'double' from date.c. check-in: fa869b0982 user: dan tags: trunk
15:23
Merge overflow and rounding fixes for sqlite4_num_to_int64(). check-in: e8db1e81a4 user: dan tags: trunk
11:47
Modify the round() and abs() SQL functions to use decimal arithmetic. check-in: 7b3bb63808 user: dan tags: trunk
2013-06-01
23:42
Handle overflow and rounding cases in sqlite4_num_to_int64. check-in: de7fb192cb user: peterreid tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/math.c. 

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}

/*
** Convert the number passed as the first argument to a signed 64-bit
** integer and return the value. If the second argument is not NULL,
** then set the value that it points to 1 if data was lost as part
** of the conversion, or 0 otherwise.




*/
sqlite4_int64 sqlite4_num_to_int64(sqlite4_num num, int *pbLossy){
  static const i64 L10 = (LARGEST_INT64 / 10);
  i64 iRet;
  int i;
  iRet = num.m;

  if( pbLossy ){
    *pbLossy = (num.m==LARGEST_UINT64 || (num.m+num.sign)>(u64)LARGEST_INT64);


  }
  for(i=num.e; i<0; i++){
    if( pbLossy && (iRet % 10) ) *pbLossy = 1;
    iRet = iRet / 10;
  }
  for(i=0; i<num.e; i++){
    if( pbLossy && iRet>L10 ) *pbLossy = 1;
    iRet = iRet * 10;
  }








#define LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
#define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
#define LARGEST_UINT64  (0xffffffff|(((u64)0xffffffff)<<32))


  if( num.sign ) iRet = iRet*-1;
  return iRet;
}


/*
** Convert an integer into text in the buffer supplied. The
** text is zero-terminated and right-justified in the buffer.
** A pointer to the first character of text is returned.








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}

/*
** Convert the number passed as the first argument to a signed 64-bit
** integer and return the value. If the second argument is not NULL,
** then set the value that it points to 1 if data was lost as part
** of the conversion, or 0 otherwise.
**
** Values round towards 0. If the number is outside the range that a
** signed 64-bit integer can represent, it is clamped to be inside
** that range.
*/
sqlite4_int64 sqlite4_num_to_int64(sqlite4_num num, int *pbLossy){
  static const i64 L10 = (LARGEST_INT64 / 10);
  u64 iRet;
  int i;
  iRet = num.m;

  if( pbLossy ) *pbLossy = 0;
  for(i=0; i<num.e; i++){
    if( iRet>L10 ) goto overflow;
    iRet = iRet * 10;
  }
  for(i=num.e; i<0; i++){
    if( pbLossy && (iRet % 10) ) *pbLossy = 1;
    iRet = iRet / 10;
  }




  if( num.sign ){
    if( iRet>(u64)LARGEST_INT64+1 ) goto overflow;
    return -(i64)iRet;
  }else{
    if( iRet>(u64)LARGEST_INT64 ) goto overflow; 
    return (i64)iRet;
  }





overflow:
  if( pbLossy ) *pbLossy = 1;
  return num.sign ? -LARGEST_INT64-1 : LARGEST_INT64;
}


/*
** Convert an integer into text in the buffer supplied. The
** text is zero-terminated and right-justified in the buffer.
** A pointer to the first character of text is returned.

Changes to test/num.test. 

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  5.1   1   {sign:0 approx:0 e:0 m:1}
  5.2   1.0 {sign:0 approx:0 e:-1 m:10}
  5.3   1.  {sign:0 approx:0 e:0 m:1}
  5.4   1e0 {sign:0 approx:0 e:0 m:1}
} {
  do_test num-9.1.$tn { sqlite4_num_from_text $in } [list {*}$out]
}
























#-------------------------------------------------------------------------
finish_test










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  5.1   1   {sign:0 approx:0 e:0 m:1}
  5.2   1.0 {sign:0 approx:0 e:-1 m:10}
  5.3   1.  {sign:0 approx:0 e:0 m:1}
  5.4   1e0 {sign:0 approx:0 e:0 m:1}
} {
  do_test num-9.1.$tn { sqlite4_num_from_text $in } [list {*}$out]
}

foreach {tn in out} {
  0     50                                            50
  1     -94                                           -94
  2     {sign:0 approx:0 e:4 m:2}                     20000
  3     9223372036854775807                           9223372036854775807
  4     -9223372036854775808                          -9223372036854775808
  5     {sign:0 approx:0 e:-1 m:51}                   ~5
  6     {sign:0 approx:0 e:0 m:9223372036854775808}  ~9223372036854775807
  7     9223372036854775808                          ~9223372036854775807
  8     10000000000000000000                         ~9223372036854775807
  9     -10000000000000000000                        ~-9223372036854775808
  10    {sign:0 approx:0 e:50 m:244}                 ~9223372036854775807
  11    {sign:1 approx:0 e:50 m:34220}               ~-9223372036854775808
  12    50.1                                         ~50
  13    10.9                                         ~10
  14    .995                                         ~0
  15    -93.9                                        ~-93
  16    -12.1                                        ~-12
} {
  do_test num-10.1.$tn { sqlite4_num_to_int64 $in } [list {*}$out]
}


#-------------------------------------------------------------------------
finish_test

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#include <string.h>

#include "sqliteInt.h"
#include "testInt.h"

#define MIN(x,y) ((x)<(y) ? (x) : (y))

typedef unsigned int  u32;
typedef unsigned char u8;
typedef long long int i64;
typedef unsigned long long int u64;

#if defined(__GLIBC__)
  extern int backtrace(void**,int);
  extern void backtrace_symbols_fd(void*const*,int,int);
# define TM_BACKTRACE 12
#else
# define backtrace(A,B) 1
# define backtrace_symbols_fd(A,B,C)








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#include <string.h>

#include "sqliteInt.h"
#include "testInt.h"

#define MIN(x,y) ((x)<(y) ? (x) : (y))






#if defined(__GLIBC__)
  extern int backtrace(void**,int);
  extern void backtrace_symbols_fd(void*const*,int,int);
# define TM_BACKTRACE 12
#else
# define backtrace(A,B) 1
# define backtrace_symbols_fd(A,B,C)

Changes to test/test_num.c. 

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  ret = sqlite4_num_from_double(val);

  Tcl_ResetResult(interp);
  append_num_result(interp, ret);
  return TCL_OK;
}

























/*
** Register commands with the TCL interpreter.
*/
int Sqlitetest_num_init(Tcl_Interp *interp){
  static struct {
     char *zName;
................................................................................
     { "sqlite4_num_to_text",           (Tcl_CmdProc*)test_num_to_text      },
     { "sqlite4_num_add",               (Tcl_CmdProc*)test_num_add          },
     { "sqlite4_num_sub",               (Tcl_CmdProc*)test_num_sub          },
     { "sqlite4_num_mul",               (Tcl_CmdProc*)test_num_mul          },
     { "sqlite4_num_div",               (Tcl_CmdProc*)test_num_div          },
     { "sqlite4_num_isinf",             (Tcl_CmdProc*)test_num_isinf        },
     { "sqlite4_num_isnan",             (Tcl_CmdProc*)test_num_isnan        },

  };

  static struct {
     char *zName;
     Tcl_ObjCmdProc *xProc;
     void *clientData;
  } aObjCmd[] = {








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  ret = sqlite4_num_from_double(val);

  Tcl_ResetResult(interp);
  append_num_result(interp, ret);
  return TCL_OK;
}


static int test_num_to_int64(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite4_num A;
  int lossy;
  sqlite4_int64 iVal;
  char buf[50];
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
      " NUM\"", 0);
    return TCL_ERROR;
  }
  A = test_parse_num(argv[1]);
  iVal = sqlite4_num_to_int64(A, &lossy);
  sprintf( buf, "%s%lld", lossy?"~":"", iVal );
  Tcl_AppendResult(interp, buf, 0);
  return TCL_OK;
}


/*
** Register commands with the TCL interpreter.
*/
int Sqlitetest_num_init(Tcl_Interp *interp){
  static struct {
     char *zName;
................................................................................
     { "sqlite4_num_to_text",           (Tcl_CmdProc*)test_num_to_text      },
     { "sqlite4_num_add",               (Tcl_CmdProc*)test_num_add          },
     { "sqlite4_num_sub",               (Tcl_CmdProc*)test_num_sub          },
     { "sqlite4_num_mul",               (Tcl_CmdProc*)test_num_mul          },
     { "sqlite4_num_div",               (Tcl_CmdProc*)test_num_div          },
     { "sqlite4_num_isinf",             (Tcl_CmdProc*)test_num_isinf        },
     { "sqlite4_num_isnan",             (Tcl_CmdProc*)test_num_isnan        },
     { "sqlite4_num_to_int64",          (Tcl_CmdProc*)test_num_to_int64     },
  };

  static struct {
     char *zName;
     Tcl_ObjCmdProc *xProc;
     void *clientData;
  } aObjCmd[] = {

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