[ruby-list:9315] Re: printf float as hex, bug or spec

わたなべです.

SUGAI Norihiko <[e-mail]> writes:

:$ ruby -e 'printf("%02x\n",1.0)'
:(d:\usr\local\bin\ruby.exe 1041) Exception: STATUS_ACCESS_VIOLATION
:/tmp/rb001041:1: [BUG] Segmentation fault
:bash.exe: [1001: 1] tcsetattr: Not a character device
:Aborted

Exception: は CYGWIN DLL が出してます.
とりあえずは
$ ruby -e 'printf("%02x\n",1.0.to_i)'
01
としましょう.


--- sprintf.c.orig	Fri Jul 24 13:32:51 1998
+++ sprintf.c	Fri Aug 28 10:42:32 1998
@@ -328,2 +328,3 @@
 		int len, pos;
+		double f;
 
@@ -358,4 +359,10 @@
 		  case T_FLOAT:
-		    val = dbl2big(RFLOAT(val)->value);
-		    bignum = 1;
+		    f = RFLOAT(val)->value;
+		    if (!FIXABLE(f)) {
+			val = dbl2big(f);
+			bignum = 1;
+		    }
+		    else {
+			v = f;
+		    }
 		    break;