/* * luaiconv - Performs character set conversions in Lua * (c) 2005-09 Alexandre Erwin Ittner * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHOR OR COPYRIGHT HOLDER BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * If you use this package in a product, an acknowledgment in the product * documentation would be greatly appreciated (but it is not required). * * $Id: luaiconv.c 65 2009-08-06 16:30:06Z dermeister $ * */ #include #include #include #include #include #define LIB_NAME "iconv" #define LIB_VERSION LIB_NAME " 6" #define ICONV_TYPENAME "iconv_t" /* Compatibility between Lua 5.1+ and Lua 5.0 */ #ifndef LUA_VERSION_NUM #define LUA_VERSION_NUM 0 #endif #if LUA_VERSION_NUM < 501 #define luaL_register(a, b, c) luaL_openlib((a), (b), (c), 0) #endif /* Emulates lua_(un)boxpointer from Lua 5.0 (don't exists on Lua 5.1) */ #define boxptr(L, p) (*(void**)(lua_newuserdata(L, sizeof(void*))) = (p)) #define unboxptr(L, i) (*(void**)(lua_touserdata(L, i))) /* Table assumed on top */ #define tblseticons(L, c, v) \ lua_pushliteral(L, c); \ lua_pushnumber(L, v); \ lua_settable(L, -3); #define ERROR_NO_MEMORY 1 #define ERROR_INVALID 2 #define ERROR_INCOMPLETE 3 #define ERROR_UNKNOWN 4 static void push_iconv_t(lua_State *L, iconv_t cd) { boxptr(L, cd); luaL_getmetatable(L, ICONV_TYPENAME); lua_setmetatable(L, -2); } static iconv_t get_iconv_t(lua_State *L, int i) { if (luaL_checkudata(L, i, ICONV_TYPENAME) != NULL) { iconv_t cd = unboxptr(L, i); if (cd == (iconv_t) NULL) luaL_error(L, "attempt to use an invalid " ICONV_TYPENAME); return cd; } luaL_typerror(L, i, ICONV_TYPENAME); return NULL; } static int Liconv_open(lua_State *L) { const char *tocode = luaL_checkstring(L, 1); const char *fromcode = luaL_checkstring(L, 2); iconv_t cd = iconv_open(tocode, fromcode); if (cd != (iconv_t)(-1)) push_iconv_t(L, cd); /* ok */ else lua_pushnil(L); /* erro */ return 1; } static int Liconv(lua_State *L) { iconv_t cd = get_iconv_t(L, 1); size_t ibleft = lua_strlen(L, 2); char *inbuf = (char*) luaL_checkstring(L, 2); char *outbuf; char *outbufs; size_t obsize = (ibleft > 256) ? ibleft : 256; size_t obleft = obsize; size_t ret = -1; int hasone = 0; outbuf = (char*) malloc(obsize * sizeof(char)); if (outbuf == NULL) { lua_pushstring(L, ""); lua_pushnumber(L, ERROR_NO_MEMORY); return 2; } outbufs = outbuf; do { ret = iconv(cd, &inbuf, &ibleft, &outbuf, &obleft); if (ret == (size_t)(-1)) { lua_pushlstring(L, outbufs, obsize - obleft); if (hasone == 1) lua_concat(L, 2); hasone = 1; if (errno == EILSEQ) { lua_pushnumber(L, ERROR_INVALID); free(outbufs); return 2; /* Invalid character sequence */ } else if (errno == EINVAL) { lua_pushnumber(L, ERROR_INCOMPLETE); free(outbufs); return 2; /* Incomplete character sequence */ } else if (errno == E2BIG) { obleft = obsize; outbuf = outbufs; } else { lua_pushnumber(L, ERROR_UNKNOWN); free(outbufs); return 2; /* Unknown error */ } } } while (ret != (size_t) 0); lua_pushlstring(L, outbufs, obsize - obleft); if (hasone == 1) lua_concat(L, 2); free(outbufs); return 1; /* Done */ } #ifdef HAS_ICONVLIST /* a GNU extension? */ static int push_one(unsigned int cnt, char *names[], void *data) { lua_State *L = (lua_State*) data; int n = (int) lua_tonumber(L, -1); int i; /* Stack: n */ lua_remove(L, -1); for (i = 0; i < cnt; i++) { /* Stack> */ lua_pushnumber(L, n++); lua_pushstring(L, names[i]); /* Stack: n */ lua_settable(L, -3); } lua_pushnumber(L, n); /* Stack: n */ return 0; } static int Liconvlist(lua_State *L) { lua_newtable(L); lua_pushnumber(L, 1); /* Stack: 1 */ iconvlist(push_one, (void*) L); /* Stack: n */ lua_remove(L, -1); return 1; } #endif static int Liconv_close(lua_State *L) { iconv_t cd = get_iconv_t(L, 1); if (iconv_close(cd) == 0) lua_pushboolean(L, 1); /* ok */ else lua_pushnil(L); /* erro */ return 1; } static const luaL_reg inconvFuncs[] = { { "open", Liconv_open }, { "new", Liconv_open }, { "iconv", Liconv }, #ifdef HAS_ICONVLIST { "list", Liconvlist }, #endif { NULL, NULL } }; static const luaL_reg iconvMT[] = { { "__gc", Liconv_close }, { NULL, NULL } }; int luaopen_iconv(lua_State *L) { luaL_register(L, LIB_NAME, inconvFuncs); tblseticons(L, "ERROR_NO_MEMORY", ERROR_NO_MEMORY); tblseticons(L, "ERROR_INVALID", ERROR_INVALID); tblseticons(L, "ERROR_INCOMPLETE", ERROR_INCOMPLETE); tblseticons(L, "ERROR_UNKNOWN", ERROR_UNKNOWN); lua_pushliteral(L, "VERSION"); lua_pushstring(L, LIB_VERSION); lua_settable(L, -3); luaL_newmetatable(L, ICONV_TYPENAME); lua_pushliteral(L, "__index"); lua_pushvalue(L, -3); lua_settable(L, -3); luaL_openlib(L, NULL, iconvMT, 0); lua_pop(L, 1); return 1; }