mirror of
https://github.com/lua/lua
synced 2024-11-25 22:29:39 +03:00
some janitorial work (comments, small refactoring)
This commit is contained in:
Roberto Ierusalimschy
parent
925d1b59f9
commit
255d59ed5e
145
loadlib.c
145
loadlib.c
@ -1,5 +1,5 @@
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/*
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** $Id: loadlib.c,v 1.113 2014/03/12 20:57:40 roberto Exp roberto $
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** $Id: loadlib.c,v 1.114 2014/07/16 13:56:14 roberto Exp roberto $
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** Dynamic library loader for Lua
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** See Copyright Notice in lua.h
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**
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@ -97,20 +97,33 @@
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#define LIB_FAIL "open"
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/* error codes for ll_loadfunc */
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#define ERRLIB 1
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#define ERRFUNC 2
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#define setprogdir(L) ((void)0)
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/*
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** system-dependent functions
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*/
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static void ll_unloadlib (void *lib);
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static void *ll_load (lua_State *L, const char *path, int seeglb);
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
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/*
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** unload library 'lib'
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*/
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static void lsys_unloadlib (void *lib);
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/*
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** load C library in file 'path'. If 'seeglb', load with all names in
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** the library global.
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** Returns the library; in case of error, returns NULL plus an
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** error string in the stack.
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*/
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static void *lsys_load (lua_State *L, const char *path, int seeglb);
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/*
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** Try to find a function named 'sym' in library 'lib'.
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** Returns the function; in case of error, returns NULL plus an
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** error string in the stack.
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*/
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static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym);
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@ -126,19 +139,19 @@ static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
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#include <dlfcn.h>
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static void ll_unloadlib (void *lib) {
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static void lsys_unloadlib (void *lib) {
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dlclose(lib);
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}
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static void *ll_load (lua_State *L, const char *path, int seeglb) {
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static void *lsys_load (lua_State *L, const char *path, int seeglb) {
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void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL));
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if (lib == NULL) lua_pushstring(L, dlerror());
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return lib;
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}
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
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lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
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if (f == NULL) lua_pushstring(L, dlerror());
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return f;
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@ -190,12 +203,12 @@ static void pusherror (lua_State *L) {
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lua_pushfstring(L, "system error %d\n", error);
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}
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static void ll_unloadlib (void *lib) {
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static void lsys_unloadlib (void *lib) {
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FreeLibrary((HMODULE)lib);
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}
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static void *ll_load (lua_State *L, const char *path, int seeglb) {
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static void *lsys_load (lua_State *L, const char *path, int seeglb) {
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HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS);
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(void)(seeglb); /* not used: symbols are 'global' by default */
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if (lib == NULL) pusherror(L);
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@ -203,7 +216,7 @@ static void *ll_load (lua_State *L, const char *path, int seeglb) {
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}
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
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lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym);
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if (f == NULL) pusherror(L);
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return f;
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@ -226,19 +239,19 @@ static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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#define DLMSG "dynamic libraries not enabled; check your Lua installation"
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static void ll_unloadlib (void *lib) {
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static void lsys_unloadlib (void *lib) {
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(void)(lib); /* not used */
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}
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static void *ll_load (lua_State *L, const char *path, int seeglb) {
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static void *lsys_load (lua_State *L, const char *path, int seeglb) {
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(void)(path); (void)(seeglb); /* not used */
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lua_pushliteral(L, DLMSG);
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return NULL;
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}
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
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(void)(lib); (void)(sym); /* not used */
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lua_pushliteral(L, DLMSG);
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return NULL;
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@ -248,7 +261,10 @@ static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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#endif
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static void *ll_checkclib (lua_State *L, const char *path) {
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/*
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** return registry.CLIBS[path]
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*/
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static void *checkclib (lua_State *L, const char *path) {
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void *plib;
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lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);
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lua_getfield(L, -1, path);
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@ -258,7 +274,11 @@ static void *ll_checkclib (lua_State *L, const char *path) {
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}
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static void ll_addtoclib (lua_State *L, const char *path, void *plib) {
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/*
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** registry.CLIBS[path] = plib -- for queries
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** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries
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*/
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static void addtoclib (lua_State *L, const char *path, void *plib) {
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lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);
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lua_pushlightuserdata(L, plib);
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lua_pushvalue(L, -1);
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@ -269,33 +289,49 @@ static void ll_addtoclib (lua_State *L, const char *path, void *plib) {
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/*
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** __gc tag method for CLIBS table: calls 'll_unloadlib' for all lib
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** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib
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** handles in list CLIBS
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*/
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static int gctm (lua_State *L) {
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int n = luaL_len(L, 1);
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for (; n >= 1; n--) { /* for each handle, in reverse order */
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lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */
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ll_unloadlib(lua_touserdata(L, -1));
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lsys_unloadlib(lua_touserdata(L, -1));
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lua_pop(L, 1); /* pop handle */
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}
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return 0;
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}
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static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
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void *reg = ll_checkclib(L, path); /* check loaded C libraries */
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/* error codes for 'lookforfunc' */
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#define ERRLIB 1
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#define ERRFUNC 2
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/*
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** Look for a C function named 'sym' in a dynamically loaded library
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** 'path'.
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** First, check whether the library is already loaded; if not, try
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** to load it.
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** Then, if 'sym' is '*', return true (as library has been loaded).
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** Otherwise, look for symbol 'sym' in the library and push a
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** C function with that symbol.
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** Return 0 and 'true' or a function in the stack; in case of
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** errors, return an error code and an error message in the stack.
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*/
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static int lookforfunc (lua_State *L, const char *path, const char *sym) {
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void *reg = checkclib(L, path); /* check loaded C libraries */
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if (reg == NULL) { /* must load library? */
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reg = ll_load(L, path, *sym == '*');
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reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */
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if (reg == NULL) return ERRLIB; /* unable to load library */
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ll_addtoclib(L, path, reg);
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addtoclib(L, path, reg);
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}
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if (*sym == '*') { /* loading only library (no function)? */
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lua_pushboolean(L, 1); /* return 'true' */
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return 0; /* no errors */
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}
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else {
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lua_CFunction f = ll_sym(L, reg, sym);
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lua_CFunction f = lsys_sym(L, reg, sym);
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if (f == NULL)
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return ERRFUNC; /* unable to find function */
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lua_pushcfunction(L, f); /* else create new function */
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@ -307,7 +343,7 @@ static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
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static int ll_loadlib (lua_State *L) {
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const char *path = luaL_checkstring(L, 1);
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const char *init = luaL_checkstring(L, 2);
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int stat = ll_loadfunc(L, path, init);
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int stat = lookforfunc(L, path, init);
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if (stat == 0) /* no errors? */
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return 1; /* return the loaded function */
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else { /* error; error message is on stack top */
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@ -416,21 +452,29 @@ static int searcher_Lua (lua_State *L) {
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}
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/*
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** Try to find a load function for module 'modname' at file 'filename'.
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** First, change '.' to '_' in 'modname'; then, if 'modname' has
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** the form X-Y (that is, it has an "ignore mark"), build a function
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** name "luaopen_X" and look for it. (For compatibility, if that
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** fails, it also tries "luaopen_Y".) If there is no ignore mark,
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** look for a function named "luaopen_modname".
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*/
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static int loadfunc (lua_State *L, const char *filename, const char *modname) {
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const char *funcname;
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const char *openfunc;
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const char *mark;
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modname = luaL_gsub(L, modname, ".", LUA_OFSEP);
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mark = strchr(modname, *LUA_IGMARK);
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if (mark) {
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int stat;
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funcname = lua_pushlstring(L, modname, mark - modname);
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funcname = lua_pushfstring(L, LUA_POF"%s", funcname);
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stat = ll_loadfunc(L, filename, funcname);
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openfunc = lua_pushlstring(L, modname, mark - modname);
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openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc);
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stat = lookforfunc(L, filename, openfunc);
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if (stat != ERRFUNC) return stat;
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modname = mark + 1; /* else go ahead and try old-style name */
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}
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funcname = lua_pushfstring(L, LUA_POF"%s", modname);
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return ll_loadfunc(L, filename, funcname);
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openfunc = lua_pushfstring(L, LUA_POF"%s", modname);
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return lookforfunc(L, filename, openfunc);
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}
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@ -686,24 +730,31 @@ static void createsearcherstable (lua_State *L) {
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lua_pushcclosure(L, searchers[i], 1);
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lua_rawseti(L, -2, i+1);
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}
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}
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LUAMOD_API int luaopen_package (lua_State *L) {
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/* create table CLIBS to keep track of loaded C libraries */
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luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS);
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lua_createtable(L, 0, 1); /* metatable for CLIBS */
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lua_pushcfunction(L, gctm);
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lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */
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lua_setmetatable(L, -2);
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/* create `package' table */
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luaL_newlib(L, pk_funcs);
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createsearcherstable(L);
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#if defined(LUA_COMPAT_LOADERS)
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lua_pushvalue(L, -1); /* make a copy of 'searchers' table */
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lua_setfield(L, -3, "loaders"); /* put it in field `loaders' */
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#endif
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lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */
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}
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/*
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** create table CLIBS to keep track of loaded C libraries,
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** setting a finalizer to close all libraries when closing state.
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*/
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static void createclibstable (lua_State *L) {
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luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); /* create CLIBS table */
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lua_createtable(L, 0, 1); /* create metatable for CLIBS */
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lua_pushcfunction(L, gctm);
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lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */
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lua_setmetatable(L, -2);
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}
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LUAMOD_API int luaopen_package (lua_State *L) {
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createclibstable(L);
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luaL_newlib(L, pk_funcs); /* create `package' table */
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createsearcherstable(L);
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/* set field 'path' */
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setpath(L, "path", LUA_PATHVARVERSION, LUA_PATH_VAR, LUA_PATH_DEFAULT);
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/* set field 'cpath' */
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