From: matz@... (Yukihiro Matsumoto)
Date: 1996-12-26T12:44:14+09:00
Subject: [ruby-list:1518] dynamic endian check for nextstep

まつもと ゆきひろです

NEXTSTEPのFat Binary用のendian check patchです．
これで実行時にendianをチェックします．でもテストしてません．^^;;

--- defines.h~	Wed Dec 25 10:22:07 1996
+++ defines.h	Thu Dec 26 02:51:49 1996
@@ -17,6 +17,7 @@
 #undef SJIS
 
 #ifdef NeXT
+#define DYNAMIC_ENDIAN		/* determine endian at runtime */
 #define S_IXUSR _S_IXUSR        /* execute/search permission, owner */
 #define S_IXGRP 0000010         /* execute/search permission, group */
 #define S_IXOTH 0000001         /* execute/search permission, other */
--- pack.c~	Tue Dec 24 15:39:08 1996
+++ pack.c	Thu Dec 26 02:50:19 1996
@@ -19,6 +19,36 @@
 			+(((x)>>24)&0xFF)	\
 			+(((x)&0x0000FF00)<<8)	\
 			+(((x)&0x00FF0000)>>8)	)
+
+#ifdef DYNAMIC_ENDIAN
+#ifdef ntohs
+#undef ntohs
+#undef ntohl
+#undef htons
+#undef htonl
+#endif
+static int
+endian()
+{
+    static int init = 0;
+    static int endian_value;
+    char *p;
+
+    if (init) return endian_value;
+    init = 1;
+    p = (char*)&init;
+    return endian_value = p[0]?0:1;
+}
+
+#define ntohs(x) (endian()?(x):swaps(x))
+#define ntohl(x) (endian()?(x):swapl(x))
+#define htons(x) (endian()?(x):swaps(x))
+#define htonl(x) (endian()?(x):swapl(x))
+#define htovs(x) (endian()?swaps(x):(x))
+#define htovl(x) (endian()?swapl(x):(x))
+#define vtohs(x) (endian()?swaps(x):(x))
+#define vtohl(x) (endian()?swapl(x):(x))
+#else
 #ifdef WORDS_BIGENDIAN
 #ifndef ntohs
 #define ntohs(x) (x)
@@ -41,6 +71,7 @@
 #define htovl(x) (x)
 #define vtohs(x) (x)
 #define vtohl(x) (x)
+#endif
 #endif
 
 extern VALUE cString, cArray;