青木です。

以下のように、Alpha での unpack("N") の結果が変です。

  aamine@asv800 % ruby -ve 'p "\000\000\000\001".unpack("N")[0]'
  ruby 1.9.0 (2004-01-01) [alpha-netbsd]
  4294967296

[ruby-dev:22353] での確認が足りませんでした。すみません。

パッチを添付します。以下の環境で動作確認しました。

  * NetBSD/Alpha (64bit/little endian)
  * Solaris/SPARCv9 (64bit/big endian)
  * Linux/i686 (32bit/little endian)

なお、テストだけは先行してコミットしてあります。
-------------------------------------------------------------------
青木峰郎

Index: pack.c =================================================================== RCS file: /src/ruby/pack.c,v retrieving revision 1.63 diff -u -p -r1.63 pack.c --- pack.c 26 Dec 2003 15:34:31 -0000 1.63 +++ pack.c 4 Jan 2004 19:43:56 -0000 @@ -22,12 +22,14 @@ #endif #ifdef NATINT_PACK +# define OFF16B(p) ((char*)(p) + (natint?0:(sizeof(short) - SIZE16))) +# define OFF32B(p) ((char*)(p) + (natint?0:(sizeof(long) - SIZE32))) # define NATINT_I32(x) (natint?NUM2LONG(x):(NUM2I32(x))) # define NATINT_U32(x) (natint?NUM2ULONG(x):(NUM2U32(x))) # define NATINT_LEN(type,len) (natint?sizeof(type):(len)) # ifdef WORDS_BIGENDIAN -# define OFF16(p) ((char*)(p) + (natint?0:(sizeof(short) - SIZE16))) -# define OFF32(p) ((char*)(p) + (natint?0:(sizeof(long) - SIZE32))) +# define OFF16(p) OFF16B(p) +# define OFF32(p) OFF32B(p) # endif # define NATINT_HTOVS(x) (natint?htovs(x):htov16(x)) # define NATINT_HTOVL(x) (natint?htovl(x):htov32(x)) @@ -47,6 +49,10 @@ # define OFF16(p) (char*)(p) # define OFF32(p) (char*)(p) #endif +#ifndef OFF16B +# define OFF16B(p) (char*)(p) +# define OFF32B(p) (char*)(p) +#endif #define define_swapx(x, xtype) \ static xtype \ @@ -1648,7 +1654,7 @@ pack_unpack(str, fmt) PACK_LENGTH_ADJUST(unsigned short,2); while (len-- > 0) { unsigned short tmp = 0; - memcpy(OFF16(&tmp), s, NATINT_LEN(unsigned short,2)); + memcpy(OFF16B(&tmp), s, NATINT_LEN(unsigned short,2)); s += NATINT_LEN(unsigned short,2); rb_ary_push(ary, UINT2NUM(ntohs(tmp))); } @@ -1659,7 +1665,7 @@ pack_unpack(str, fmt) PACK_LENGTH_ADJUST(unsigned long,4); while (len-- > 0) { unsigned long tmp = 0; - memcpy(OFF32(&tmp), s, NATINT_LEN(unsigned long,4)); + memcpy(OFF32B(&tmp), s, NATINT_LEN(unsigned long,4)); s += NATINT_LEN(unsigned long,4); rb_ary_push(ary, ULONG2NUM(ntohl(tmp))); }