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From Lua 5.2: Add package.searchpath().

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Thanks to F. Perrad.
This commit is contained in:
Mike Pall 2011-02-20 20:48:13 +01:00
parent f83d58d6fb
commit baef199ece
1 changed files with 29 additions and 10 deletions
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39
src/lib_package.c
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@ -3,7 +3,7 @@
** Copyright (C) 2005-2011 Mike Pall. See Copyright Notice in luajit.h
**
** Major portions taken verbatim or adapted from the Lua interpreter.
** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
** Copyright (C) 1994-2011 Lua.org, PUC-Rio. See Copyright Notice in lua.h
*/
#define lib_package_c
@ -210,19 +210,14 @@ static const char *pushnexttemplate(lua_State *L, const char *path)
return l;
}
static const char *findfile(lua_State *L, const char *name,
const char *pname)
static const char *searchpath (lua_State *L, const char *name,
const char *path)
{
const char *path;
name = luaL_gsub(L, name, ".", LUA_DIRSEP);
lua_getfield(L, LUA_ENVIRONINDEX, pname);
path = lua_tostring(L, -1);
if (path == NULL)
luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
lua_pushliteral(L, ""); /* error accumulator */
while ((path = pushnexttemplate(L, path)) != NULL) {
const char *filename;
filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
const char *filename = luaL_gsub(L, lua_tostring(L, -1),
LUA_PATH_MARK, name);
lua_remove(L, -2); /* remove path template */
if (readable(filename)) /* does file exist and is readable? */
return filename; /* return that file name */
@ -233,6 +228,29 @@ static const char *findfile(lua_State *L, const char *name,
return NULL; /* not found */
}
static int lj_cf_package_searchpath(lua_State *L)
{
const char *f = searchpath(L, luaL_checkstring(L, 1), luaL_checkstring(L, 2));
if (f != NULL) {
return 1;
} else { /* error message is on top of the stack */
lua_pushnil(L);
lua_insert(L, -2);
return 2; /* return nil + error message */
}
}
static const char *findfile(lua_State *L, const char *name,
const char *pname)
{
const char *path;
lua_getfield(L, LUA_ENVIRONINDEX, pname);
path = lua_tostring(L, -1);
if (path == NULL)
luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
return searchpath(L, name, path);
}
static void loaderror(lua_State *L, const char *filename)
{
luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
@ -459,6 +477,7 @@ static void setpath(lua_State *L, const char *fieldname, const char *envname,
static const luaL_Reg package_lib[] = {
{ "loadlib", lj_cf_package_loadlib },
{ "searchpath", lj_cf_package_searchpath },
{ "seeall", lj_cf_package_seeall },
{ NULL, NULL }
};