Add build option to disable invalid numbers

Windows MinGW doesn't convert Infinity/NaN/hexadecimal numbers. Add
DISABLE_INVALID_NUMBERS build option option to disable invalid numbers.

4 files changed, 39 insertions, 16 deletions

diff --git a/Makefile b/Makefile
index 085e78a..999b877 100644
--- a/Makefile
+++ b/Makefile
@@ -2,8 +2,10 @@ LUA_VERSION =   5.1
 
 ## Available defines for CJSON_CFLAGS
 #
-# USE_INTERNAL_ISINF:   Workaround for Solaris platforms missing isinf().
-# DISABLE_CJSON_GLOBAL: Do not store module is "cjson" global
+# USE_INTERNAL_ISINF:      Workaround for Solaris platforms missing isinf().
+# DISABLE_CJSON_GLOBAL:    Do not store module is "cjson" global.
+# DISABLE_INVALID_NUMBERS: Permanently disable invalid JSON numbers:
+#                          - NaN, Infinity, hex.
 
 ## Build defaults
 TARGET =            cjson.so
@@ -38,7 +40,7 @@ INSTALL_CMD =       install
 ## Windows (MinGW)
 #TARGET =            cjson.dll
 #PREFIX =            /home/user/opt
-#CJSON_CFLAGS =
+#CJSON_CFLAGS =      -DDISABLE_INVALID_NUMBERS
 #CJSON_LDFLAGS =     -shared -L$(PREFIX)/lib -llua51
 
 ## End platform specific section
diff --git a/lua-cjson-1.0devel-1.rockspec b/lua-cjson-1.0devel-1.rockspec
index fa20c53..9ef9f2c 100644
--- a/lua-cjson-1.0devel-1.rockspec
+++ b/lua-cjson-1.0devel-1.rockspec
@@ -25,15 +25,18 @@ build = {
         cjson = {
             sources = { "lua_cjson.c", "strbuf.c", "fpconv.c" },
             defines = {
--- Optional workaround:
--- USE_INTERNAL_ISINF:  Provide internal isinf() implementation. Required
---                      on some Solaris platforms.
 -- LuaRocks does not support platform specific configuration for Solaris.
--- Uncomment the line below on Solaris platforms.
+-- Uncomment the line below on Solaris platforms if required.
 --                "USE_INTERNAL_ISINF"
             }
         }
     },
+    -- Override default build options (per platform)
+    platforms = {
+        win32 = { modules = { cjson = { defines = {
+            "DISABLE_INVALID_NUMBERS"
+        } } } }
+    },
     copy_directories = { "tests" }
 }
 
diff --git a/lua_cjson.c b/lua_cjson.c
index 175433a..ca85156 100644
--- a/lua_cjson.c
+++ b/lua_cjson.c
@@ -67,6 +67,11 @@
 #define DEFAULT_ENCODE_KEEP_BUFFER 1
 #define DEFAULT_ENCODE_NUMBER_PRECISION 14
 
+#ifdef DISABLE_INVALID_NUMBERS
+#undef DEFAULT_DECODE_REFUSE_BADNUM
+#define DEFAULT_DECODE_REFUSE_BADNUM 1
+#endif
+
 typedef enum {
     T_OBJ_BEGIN,
     T_OBJ_END,
@@ -341,6 +346,16 @@ static int json_cfg_refuse_invalid_numbers(lua_State *l)
                      &cfg->encode_refuse_badnum,
                      &cfg->decode_refuse_badnum);
 
+#if DISABLE_INVALID_NUMBERS
+    /* Some non-POSIX platforms don't handle double <-> string translations
+     * for Infinity/NaN/hexadecimal properly. Throw an error if the
+     * user attempts to enable them. */
+    if (!cfg->encode_refuse_badnum || !cfg->decode_refuse_badnum) {
+        cfg->encode_refuse_badnum = cfg->decode_refuse_badnum = 1;
+        luaL_error(l, "Infinity, NaN, and/or hexadecimal numbers are not supported.");
+    }
+#endif
+
     return 1;
 }
 
diff --git a/manual.txt b/manual.txt
index 3ccbce3..33fcc56 100644
--- a/manual.txt
+++ b/manual.txt
@@ -42,15 +42,6 @@ RPM:: Linux
 LuaRocks:: Unix, Windows
 
 
-Build Options (#define)
-~~~~~~~~~~~~~~~~~~~~~~~
-
-[horizontal]
-USE_INTERNAL_ISINF:: Workaround for Solaris platforms missing isinf().
-DISABLE_CJSON_GLOBAL:: Do not store module table in global "cjson"
-  variable. Redundant from Lua 5.2 onwards.
-
-
 Make
 ~~~~
 
@@ -117,6 +108,18 @@ Review the http://luarocks.org/en/Documentation[LuaRocks documentation]
 for further details.
 
 
+Build Options (#define)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+[horizontal]
+USE_INTERNAL_ISINF:: Workaround for Solaris platforms missing ++isinf++(3).
+DISABLE_CJSON_GLOBAL:: Do not store module table in global "cjson"
+  variable. Redundant from Lua 5.2 onwards.
+DISABLE_INVALID_NUMBERS:: Recommended on platforms where ++strtod++(3) /
+  ++sprintf++(3) are not POSIX compliant (Eg, Windows MinGW). Restricts
+  the +cjson.refuse_invalid_numbers+ runtime configuration to +true+.
+
+
 API (Functions)
 ---------------