diff options
Diffstat (limited to 'src/test_func.c')
| -rw-r--r-- | src/test_func.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/test_func.c b/src/test_func.c index c4fe351..6f9bb03 100644 --- a/src/test_func.c +++ b/src/test_func.c @@ -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; |