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Improved rounding accuracy on test-to-float conversions.

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FossilOrigin-Name: 699b792c6a0e989994549959b11ec1bfad8bbd92
This commit is contained in:
drh
2012-06-19 00:45:16 +00:00
parent 2ae26b759d
commit 89f15088f0
5 changed files with 85 additions and 10 deletions
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38
src/test_func.c
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@@ -422,6 +422,43 @@ static void testHexToUtf16le(
}
#endif
/*
** SQL function: real2hex(X)
**
** If argument X is a real number, then convert it into a string which is
** the big-endian hexadecimal representation of the ieee754 encoding of
** that number. If X is not a real number, return NULL.
*/
static void real2hex(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
union {
sqlite3_uint64 i;
double r;
unsigned char x[8];
} v;
char zOut[20];
int i;
int bigEndian;
v.i = 1;
bigEndian = v.x[0]==0;
v.r = sqlite3_value_double(argv[0]);
for(i=0; i<8; i++){
if( bigEndian ){
zOut[i*2] = "0123456789abcdef"[v.x[i]>>4];
zOut[i*2+1] = "0123456789abcdef"[v.x[i]&0xf];
}else{
zOut[14-i*2] = "0123456789abcdef"[v.x[i]>>4];
zOut[14-i*2+1] = "0123456789abcdef"[v.x[i]&0xf];
}
}
zOut[16] = 0;
sqlite3_result_text(context, zOut, -1, SQLITE_TRANSIENT);
}
static int registerTestFunctions(sqlite3 *db){
static const struct {
char *zName;
@@ -444,6 +481,7 @@ static int registerTestFunctions(sqlite3 *db){
{ "test_eval", 1, SQLITE_UTF8, test_eval},
{ "test_isolation", 2, SQLITE_UTF8, test_isolation},
{ "test_counter", 1, SQLITE_UTF8, counterFunc},
{ "real2hex", 1, SQLITE_UTF8, real2hex},
};
int i;