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- Subject: Non-FPU Lua 5.1
- From: ramsdell@... (John D. Ramsdell)
- Date: 07 Apr 2006 07:10:58 -0400
I am modifying my Lua 5.1 sources for an environment without a
floating point unit. I tried to retrieve the relevant patch described
at lua-users.org, but this is what happens:
$ svn co svn://slugak.dyndns.org/public/lua-patches
svn: Can't connect to host 'slugak.dyndns.org': Connection refused
So I simply hacked the sources, which seems to mean one must modify
only lmathlib.c and luaconf.h. It all seems straightforward with the
exception of changing the macro luai_numpow. What definition is
appropriate? Also, why is pow called directly in lmathlib.c, rather
than called via luai_numpow?
John
diff -ur olua-5.1/src/lmathlib.c lua-5.1/src/lmathlib.c
--- olua-5.1/src/lmathlib.c 2005-08-26 13:36:32.000000000 -0400
+++ lua-5.1/src/lmathlib.c 2006-04-04 15:28:38.000000000 -0400
@@ -252,8 +252,10 @@
luaL_register(L, LUA_MATHLIBNAME, mathlib);
lua_pushnumber(L, PI);
lua_setfield(L, -2, "pi");
+#if defined(LUA_NUMBER_DOUBLE)
lua_pushnumber(L, HUGE_VAL);
lua_setfield(L, -2, "huge");
+#endif
#if defined(LUA_COMPAT_MOD)
lua_getfield(L, -1, "fmod");
lua_setfield(L, -2, "mod");
diff -ur olua-5.1/src/luaconf.h lua-5.1/src/luaconf.h
--- olua-5.1/src/luaconf.h 2006-02-10 12:44:06.000000000 -0500
+++ lua-5.1/src/luaconf.h 2006-04-04 16:02:39.000000000 -0400
@@ -128,8 +128,8 @@
** CHANGE that if ptrdiff_t is not adequate on your machine. (On most
** machines, ptrdiff_t gives a good choice between int or long.)
*/
-#define LUA_INTEGER ptrdiff_t
+#define LUA_INTEGER long
/*
@@ LUA_API is a mark for all core API functions.
@@ -488,14 +488,14 @@
** ===================================================================
*/
-#define LUA_NUMBER_DOUBLE
-#define LUA_NUMBER double
+#define LUA_NUMBER_LONG
+#define LUA_NUMBER LUA_INTEGER
/*
@@ LUAI_UACNUMBER is the result of an 'usual argument conversion'
@* over a number.
*/
-#define LUAI_UACNUMBER double
+#define LUAI_UACNUMBER LUA_NUMBER
/*
@@ -505,11 +505,11 @@
@@ LUAI_MAXNUMBER2STR is maximum size of previous conversion.
@@ lua_str2number converts a string to a number.
*/
-#define LUA_NUMBER_SCAN "%lf"
-#define LUA_NUMBER_FMT "%.14g"
+#define LUA_NUMBER_SCAN "%ld"
+#define LUA_NUMBER_FMT "%ld"
#define lua_number2str(s,n) sprintf((s), LUA_NUMBER_FMT, (n))
-#define LUAI_MAXNUMBER2STR 32 /* 16 digits, sign, point, and \0 */
-#define lua_str2number(s,p) strtod((s), (p))
+#define LUAI_MAXNUMBER2STR 32
+#define lua_str2number(s,p) strtol((s), (p), 10)
/*
@@ -521,7 +521,7 @@
#define luai_numsub(a,b) ((a)-(b))
#define luai_nummul(a,b) ((a)*(b))
#define luai_numdiv(a,b) ((a)/(b))
-#define luai_nummod(a,b) ((a) - floor((a)/(b))*(b))
+#define luai_nummod(a,b) ((a)%(b))
#define luai_numpow(a,b) (pow(a,b))
#define luai_numunm(a) (-(a))
#define luai_numeq(a,b) ((a)==(b))