[Minor] Lua_util: Fix Lua 5.2 compatibility

Issue: #2831

diff --git a/src/lua/lua_util.c b/src/lua/lua_util.c
index 1a5f11c4fadf97df25da9f7f3e1af79535ad8cae..25fdc15144d4c5fb6899367d428c8669daaeefb9 100644 (file)
--- a/src/lua/lua_util.c
+++ b/src/lua/lua_util.c
@@ -3114,7 +3114,12 @@ typedef enum KOption {
        Knop        /* no-op (configuration or spaces) */
 } KOption;
 
-#if LUA_VERSION_NUM < 503
+#if LUA_VERSION_NUM <= 502
+#define lua_Unsigned size_t
+#endif
+
+#if LUA_VERSION_NUM < 502
+
 #define lua_Unsigned size_t
 
 typedef struct luaL_Buffer_53 {
@@ -3128,6 +3133,7 @@ typedef struct luaL_Buffer_53 {
 #define luaL_Buffer luaL_Buffer_53
 #define COMPAT53_PREFIX lua
 #undef COMPAT53_API
+
 #if defined(__GNUC__) || defined(__clang__)
 # define COMPAT53_API __attribute__((__unused__)) static
 #else
@@ -3176,19 +3182,14 @@ COMPAT53_API void
 luaL_buffinit (lua_State *L, luaL_Buffer_53 *B)
 {
        /* make it crash if used via pointer to a 5.1-style luaL_Buffer */
-#if LUA_VERSION_NUM < 502
        B->b.p = NULL;
        B->b.L = NULL;
        B->b.lvl = 0;
        /* reuse the buffer from the 5.1-style luaL_Buffer though! */
        B->ptr = B->b.buffer;
        B->nelems = 0;
-#elif LUA_VERSION_NUM == 502
-        B->ptr = B->b.b;
-       B->nelems = B->b.n;
-#endif
        B->capacity = LUAL_BUFFERSIZE;
-        B->L2 = L;
+       B->L2 = L;
 }
 
 
@@ -3204,12 +3205,9 @@ luaL_prepbuffsize (luaL_Buffer_53 *B, size_t s)
                        luaL_error (B->L2, "buffer too large");
                newptr = (char *) lua_newuserdata (B->L2, newcap);
                memcpy(newptr, B->ptr, B->nelems);
-#if LUA_VERSION_NUM < 502
-               if (B->ptr != B->b.buffer)
-#elif LUA_VERSION_NUM == 502
-               if (B->ptr != B->b.b)
-#endif
+               if (B->ptr != B->b.buffer) {
                        lua_replace (B->L2, -2); /* remove old buffer */
+               }
                B->ptr = newptr;
                B->capacity = newcap;
        }
@@ -3232,18 +3230,11 @@ luaL_addvalue (luaL_Buffer_53 *B)
        const char *s = lua_tolstring (B->L2, -1, &len);
        if (!s)
                luaL_error (B->L2, "cannot convert value to string");
-#if LUA_VERSION_NUM < 502
-       if (B->ptr != B->b.buffer)
-#elif LUA_VERSION_NUM == 502
-       if (B->ptr != B->b.b)
-#endif
+       if (B->ptr != B->b.buffer) {
                lua_insert (B->L2, -2); /* userdata buffer must be at stack top */
+       }
        luaL_addlstring (B, s, len);
-#if LUA_VERSION_NUM < 502
        lua_remove (B->L2, B->ptr != B->b.buffer ? -2 : -1);
-#elif LUA_VERSION_NUM == 502
-       lua_remove (B->L2, B->ptr != B->b.b ? -2 : -1);
-#endif
 }
 
 
@@ -3251,12 +3242,9 @@ COMPAT53_API void
 luaL_pushresult (luaL_Buffer_53 *B)
 {
        lua_pushlstring (B->L2, B->ptr, B->nelems);
-#if LUA_VERSION_NUM < 502
-       if (B->ptr != B->b.buffer)
-#elif LUA_VERSION_NUM == 502
-       if (B->ptr != B->b.b)
-#endif
+       if (B->ptr != B->b.buffer) {
                lua_replace (B->L2, -2); /* remove userdata buffer */
+       }
 }
 
 #endif