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Avoid using the internal printf routine for round(x,y) in the common case where y==0.

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FossilOrigin-Name: d76ad8b3c494ffb4e670da0e92a1f8dbf7f48daf
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shaneh
2010-02-17 04:19:27 +00:00
parent 35c1a793ce
commit 147e176aff
3 changed files with 21 additions and 11 deletions
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src/func.c
+14 -4
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@@ -271,14 +271,24 @@ static void roundFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
}
if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
r = sqlite3_value_double(argv[0]);
zBuf = sqlite3_mprintf("%.*f",n,r);
if( zBuf==0 ){
sqlite3_result_error_nomem(context);
/* If Y==0 and X will fit in a 64-bit int,
** handle the rounding directly,
** otherwise use printf.
*/
if( n==0 && r>=0 && r<LARGEST_INT64-1 ){
r = (double)((sqlite_int64)(r+0.5));
}else if( n==0 && r<0 && (-r)<LARGEST_INT64-1 ){
r = -(double)((sqlite_int64)((-r)+0.5));
}else{
zBuf = sqlite3_mprintf("%.*f",n,r);
if( zBuf==0 ){
sqlite3_result_error_nomem(context);
return;
}
sqlite3AtoF(zBuf, &r);
sqlite3_free(zBuf);
sqlite3_result_double(context, r);
}
sqlite3_result_double(context, r);
}
#endif