add setbyte

5 files changed, 75 insertions, 1 deletions

diff --git a/core/src/xmake/engine.c b/core/src/xmake/engine.c
index e4ac9f0f5..e7c4c9644 100644
--- a/core/src/xmake/engine.c
+++ b/core/src/xmake/engine.c
@@ -231,6 +231,7 @@ tb_int_t xm_libc_dataptr(lua_State* lua);
 tb_int_t xm_libc_ptraddr(lua_State* lua);
 tb_int_t xm_libc_diffptr(lua_State* lua);
 tb_int_t xm_libc_byteof(lua_State* lua);
+tb_int_t xm_libc_setbyte(lua_State* lua);
 
 #ifdef XM_CONFIG_API_HAVE_CURSES
 // register curses
@@ -435,6 +436,7 @@ static luaL_Reg const g_libc_functions[] =
 ,   { "ptraddr",        xm_libc_ptraddr     }
 ,   { "diffptr",        xm_libc_diffptr     }
 ,   { "byteof",         xm_libc_byteof      }
+,   { "setbyte",        xm_libc_setbyte     }
 ,   { tb_null,          tb_null             }
 };
 
diff --git a/core/src/xmake/libc/setbyte.c b/core/src/xmake/libc/setbyte.c
new file mode 100644
index 000000000..298e056a6
--- /dev/null
+++ b/core/src/xmake/libc/setbyte.c
@@ -0,0 +1,62 @@
+/*!A cross-platform build utility based on Lua
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright (C) 2015-present, TBOOX Open Source Group.
+ *
+ * @author      ruki
+ * @file        setbyte.c
+ *
+ */
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * trace
+ */
+#define TB_TRACE_MODULE_NAME    "setbyte"
+#define TB_TRACE_MODULE_DEBUG   (0)
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * includes
+ */
+#include "prefix.h"
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * implementation
+ */
+tb_int_t xm_libc_setbyte(lua_State* lua)
+{
+    // check
+    tb_assert_and_check_return_val(lua, 0);
+
+    // get data
+    tb_pointer_t data = tb_null;
+    if (xm_lua_ispointer(lua, 1))
+        data = (tb_pointer_t)xm_lua_topointer(lua, 1);
+    else if (lua_isstring(lua, 1))
+        data = (tb_pointer_t)luaL_checkstring(lua, 1);
+    else xm_libc_return_error(lua, "libc.setbyte(invalid data)!");
+
+    // get offset
+    tb_int_t offset = 0;
+    if (lua_isnumber(lua, 2))
+        offset = (tb_int_t)lua_tonumber(lua, 2);
+    else xm_libc_return_error(lua, "libc.setbyte(invalid offset)!");
+
+    // set byte
+    if (lua_isnumber(lua, 3))
+        ((tb_byte_t*)data)[offset] = (tb_byte_t)lua_tointeger(lua, 3);
+    else xm_libc_return_error(lua, "libc.setbyte(invalid value)!");
+    return 0;
+}
+
+
diff --git a/core/src/xmake/makefile b/core/src/xmake/makefile
index a37003b37..5d3236c2d 100644
--- a/core/src/xmake/makefile
+++ b/core/src/xmake/makefile
@@ -124,6 +124,7 @@ xmake_C_FILES 			+= \
 						libc/ptraddr \
 						libc/diffptr \
 						libc/byteof \
+						libc/setbyte \
 						libc/strndup
 
 iswin =
diff --git a/xmake/core/base/bytes.lua b/xmake/core/base/bytes.lua
index 0486f0178..300d2a073 100644
--- a/xmake/core/base/bytes.lua
+++ b/xmake/core/base/bytes.lua
@@ -411,7 +411,7 @@ function _instance:__newindex(key, value)
         if key < 1 or key > self:size() then
             os.raise("%s: index(%d/%d) out of bounds!", self, key, self:size())
         end
-        self._CDATA[key - 1] = value
+        libc.setbyte(self._CDATA, key - 1, value)
         return
     elseif type(key) == "table" then
         local start, last = key[1], key[2]
diff --git a/xmake/core/base/libc.lua b/xmake/core/base/libc.lua
index d3f02d7f5..6e69dd203 100644
--- a/xmake/core/base/libc.lua
+++ b/xmake/core/base/libc.lua
@@ -31,6 +31,7 @@ libc._dataptr = libc._dataptr or libc.dataptr
 libc._ptraddr = libc._ptraddr or libc.ptraddr
 libc._diffptr = libc._diffptr or libc.diffptr
 libc._byteof  = libc._byteof or libc.byteof
+libc._setbyte = libc._setbyte or libc.setbyte
 
 -- load modules
 local ffi = xmake._LUAJIT and require("ffi")
@@ -103,6 +104,14 @@ function libc.byteof(data, offset)
     end
 end
 
+function libc.setbyte(data, offset, value)
+    if ffi then
+        data[offset] = value
+    else
+        return libc._setbyte(data, offset, value)
+    end
+end
+
 function libc.diffptr(data, offset)
     if ffi then
         return data + offset