/*** $Id: loadlib.c,v 1.124 2015/01/05 13:51:39 roberto Exp $** Dynamic library loader for Lua** See Copyright Notice in lua.h**** This module contains an implementation of loadlib for Unix systems** that have dlfcn, an implementation for Windows, and a stub for other** systems.*/ #define loadlib_c#define LUA_LIB #include "lprefix.h" #include <stdlib.h>#include <string.h> #include "lua.h" #include "lauxlib.h"#include "lualib.h" /*** LUA_PATH_VAR and LUA_CPATH_VAR are the names of the environment** variables that Lua check to set its paths.*/#if !defined(LUA_PATH_VAR)#define LUA_PATH_VAR "LUA_PATH"#endif #if !defined(LUA_CPATH_VAR)#define LUA_CPATH_VAR "LUA_CPATH"#endif #define LUA_PATHSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR #define LUA_PATHVARVERSION LUA_PATH_VAR LUA_PATHSUFFIX#define LUA_CPATHVARVERSION LUA_CPATH_VAR LUA_PATHSUFFIX /*** LUA_PATH_SEP is the character that separates templates in a path.** LUA_PATH_MARK is the string that marks the substitution points in a** template.** LUA_EXEC_DIR in a Windows path is replaced by the executable's** directory.** LUA_IGMARK is a mark to ignore all before it when building the** luaopen_ function name.*/#if !defined (LUA_PATH_SEP)#define LUA_PATH_SEP ";"#endif#if !defined (LUA_PATH_MARK)#define LUA_PATH_MARK "?"#endif#if !defined (LUA_EXEC_DIR)#define LUA_EXEC_DIR "!"#endif#if !defined (LUA_IGMARK)#define LUA_IGMARK "-"#endif /*** LUA_CSUBSEP is the character that replaces dots in submodule names** when searching for a C loader.** LUA_LSUBSEP is the character that replaces dots in submodule names** when searching for a Lua loader.*/#if !defined(LUA_CSUBSEP)#define LUA_CSUBSEP LUA_DIRSEP#endif #if !defined(LUA_LSUBSEP)#define LUA_LSUBSEP LUA_DIRSEP#endif /* prefix for open functions in C libraries */#define LUA_POF "luaopen_" /* separator for open functions in C libraries */#define LUA_OFSEP "_" /*** unique key for table in the registry that keeps handles** for all loaded C libraries*/static const int CLIBS = 0; #define LIB_FAIL "open" #define setprogdir(L) ((void)0) /*** system-dependent functions*/ /*** unload library 'lib'*/static void lsys_unloadlib (void *lib); /*** load C library in file 'path'. If 'seeglb', load with all names in** the library global.** Returns the library; in case of error, returns NULL plus an** error string in the stack.*/static void *lsys_load (lua_State *L, const char *path, int seeglb); /*** Try to find a function named 'sym' in library 'lib'.** Returns the function; in case of error, returns NULL plus an** error string in the stack.*/static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym); #if defined(LUA_USE_DLOPEN) /* { *//*** {========================================================================** This is an implementation of loadlib based on the dlfcn interface.** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least** as an emulation layer on top of native functions.** =========================================================================*/ #include <dlfcn.h> /*** Macro to covert pointer to void* to pointer to function. This cast** is undefined according to ISO C, but POSIX assumes that it must work.** (The '__extension__' in gnu compilers is only to avoid warnings.)*/#if defined(__GNUC__)#define cast_func(p) (__extension__ (lua_CFunction)(p))#else#define cast_func(p) ((lua_CFunction)(p))#endif static void lsys_unloadlib (void *lib) { dlclose(lib);} static void *lsys_load (lua_State *L, const char *path, int seeglb) { void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL)); if (lib == NULL) lua_pushstring(L, dlerror()); return lib;} static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { lua_CFunction f = cast_func(dlsym(lib, sym)); if (f == NULL) lua_pushstring(L, dlerror()); return f;} /* }====================================================== */ #elif defined(LUA_DL_DLL) /* }{ *//*** {======================================================================** This is an implementation of loadlib for Windows using native functions.** =======================================================================*/ #include <windows.h> #undef setprogdir /*** optional flags for LoadLibraryEx*/#if !defined(LUA_LLE_FLAGS)#define LUA_LLE_FLAGS 0#endif static void setprogdir (lua_State *L) { char buff[MAX_PATH + 1]; char *lb; DWORD nsize = sizeof(buff)/sizeof(char); DWORD n = GetModuleFileNameA(NULL, buff, nsize); if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) luaL_error(L, "unable to get ModuleFileName"); else { *lb = '\0'; luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff); lua_remove(L, -2); /* remove original string */ }} static void pusherror (lua_State *L) { int error = GetLastError(); char buffer[128]; if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL)) lua_pushstring(L, buffer); else lua_pushfstring(L, "system error %d\n", error);} static void lsys_unloadlib (void *lib) { FreeLibrary((HMODULE)lib);} static void *lsys_load (lua_State *L, const char *path, int seeglb) { HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS); (void)(seeglb); /* not used: symbols are 'global' by default */ if (lib == NULL) pusherror(L); return lib;} static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym); if (f == NULL) pusherror(L); return f;} /* }====================================================== */ #else /* }{ *//*** {======================================================** Fallback for other systems** =======================================================*/ #undef LIB_FAIL#define LIB_FAIL "absent" #define DLMSG "dynamic libraries not enabled; check your Lua installation" static void lsys_unloadlib (void *lib) { (void)(lib); /* not used */} static void *lsys_load (lua_State *L, const char *path, int seeglb) { (void)(path); (void)(seeglb); /* not used */ lua_pushliteral(L, DLMSG); return NULL;} static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { (void)(lib); (void)(sym); /* not used */ lua_pushliteral(L, DLMSG); return NULL;} /* }====================================================== */#endif /* } */ /*** return registry.CLIBS[path]*/static void *checkclib (lua_State *L, const char *path) { void *plib; lua_rawgetp(L, LUA_REGISTRYINDEX, &CLIBS); lua_getfield(L, -1, path); plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */ lua_pop(L, 2); /* pop CLIBS table and 'plib' */ return plib;} /*** registry.CLIBS[path] = plib -- for queries** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries*/static void addtoclib (lua_State *L, const char *path, void *plib) { lua_rawgetp(L, LUA_REGISTRYINDEX, &CLIBS); lua_pushlightuserdata(L, plib); lua_pushvalue(L, -1); lua_setfield(L, -3, path); /* CLIBS[path] = plib */ lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */ lua_pop(L, 1); /* pop CLIBS table */} /*** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib** handles in list CLIBS*/static int gctm (lua_State *L) { lua_Integer n = luaL_len(L, 1); for (; n >= 1; n--) { /* for each handle, in reverse order */ lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */ lsys_unloadlib(lua_touserdata(L, -1)); lua_pop(L, 1); /* pop handle */ } return 0;} /* error codes for 'lookforfunc' */#define ERRLIB 1#define ERRFUNC 2 /*** Look for a C function named 'sym' in a dynamically loaded library** 'path'.** First, check whether the library is already loaded; if not, try** to load it.** Then, if 'sym' is '*', return true (as library has been loaded).** Otherwise, look for symbol 'sym' in the library and push a** C function with that symbol.** Return 0 and 'true' or a function in the stack; in case of** errors, return an error code and an error message in the stack.*/static int lookforfunc (lua_State *L, const char *path, const char *sym) { void *reg = checkclib(L, path); /* check loaded C libraries */ if (reg == NULL) { /* must load library? */ reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */ if (reg == NULL) return ERRLIB; /* unable to load library */ addtoclib(L, path, reg); } if (*sym == '*') { /* loading only library (no function)? */ lua_pushboolean(L, 1); /* return 'true' */ return 0; /* no errors */ } else { lua_CFunction f = lsys_sym(L, reg, sym); if (f == NULL) return ERRFUNC; /* unable to find function */ lua_pushcfunction(L, f); /* else create new function */ return 0; /* no errors */ }} static int ll_loadlib (lua_State *L) { const char *path = luaL_checkstring(L, 1); const char *init = luaL_checkstring(L, 2); int stat = lookforfunc(L, path, init); if (stat == 0) /* no errors? */ return 1; /* return the loaded function */ else { /* error; error message is on stack top */ lua_pushnil(L); lua_insert(L, -2); lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init"); return 3; /* return nil, error message, and where */ }} /*** {======================================================** 'require' function** =======================================================*/ static int readable (const char *filename) { FILE *f = fopen(filename, "r"); /* try to open file */ if (f == NULL) return 0; /* open failed */ fclose(f); return 1;} static const char *pushnexttemplate (lua_State *L, const char *path) { const char *l; while (*path == *LUA_PATH_SEP) path++; /* skip separators */ if (*path == '\0') return NULL; /* no more templates */ l = strchr(path, *LUA_PATH_SEP); /* find next separator */ if (l == NULL) l = path + strlen(path); lua_pushlstring(L, path, l - path); /* template */ return l;} static const char *searchpath (lua_State *L, const char *name, const char *path, const char *sep, const char *dirsep) { luaL_Buffer msg; /* to build error message */ luaL_buffinit(L, &msg); if (*sep != '\0') /* non-empty separator? */ name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */ while ((path = pushnexttemplate(L, path)) != NULL) { 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 */ lua_pushfstring(L, "\n\tno file '%s'", filename); lua_remove(L, -2); /* remove file name */ luaL_addvalue(&msg); /* concatenate error msg. entry */ } luaL_pushresult(&msg); /* create error message */ return NULL; /* not found */} static int ll_searchpath (lua_State *L) { const char *f = searchpath(L, luaL_checkstring(L, 1), luaL_checkstring(L, 2), luaL_optstring(L, 3, "."), luaL_optstring(L, 4, LUA_DIRSEP)); 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 *dirsep) { const char *path; lua_getfield(L, lua_upvalueindex(1), pname); path = lua_tostring(L, -1); if (path == NULL) luaL_error(L, "'package.%s' must be a string", pname); return searchpath(L, name, path, ".", dirsep);} static int checkload (lua_State *L, int stat, const char *filename) { if (stat) { /* module loaded successfully? */ lua_pushstring(L, filename); /* will be 2nd argument to module */ return 2; /* return open function and file name */ } else return luaL_error(L, "error loading module '%s' from file '%s':\n\t%s", lua_tostring(L, 1), filename, lua_tostring(L, -1));} static int searcher_Lua (lua_State *L) { const char *filename; const char *name = luaL_checkstring(L, 1); filename = findfile(L, name, "path", LUA_LSUBSEP); if (filename == NULL) return 1; /* module not found in this path */ return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename);} /*** Try to find a load function for module 'modname' at file 'filename'.** First, change '.' to '_' in 'modname'; then, if 'modname' has** the form X-Y (that is, it has an "ignore mark"), build a function** name "luaopen_X" and look for it. (For compatibility, if that** fails, it also tries "luaopen_Y".) If there is no ignore mark,** look for a function named "luaopen_modname".*/static int loadfunc (lua_State *L, const char *filename, const char *modname) { const char *openfunc; const char *mark; modname = luaL_gsub(L, modname, ".", LUA_OFSEP); mark = strchr(modname, *LUA_IGMARK); if (mark) { int stat; openfunc = lua_pushlstring(L, modname, mark - modname); openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc); stat = lookforfunc(L, filename, openfunc); if (stat != ERRFUNC) return stat; modname = mark + 1; /* else go ahead and try old-style name */ } openfunc = lua_pushfstring(L, LUA_POF"%s", modname); return lookforfunc(L, filename, openfunc);} static int searcher_C (lua_State *L) { const char *name = luaL_checkstring(L, 1); const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP); if (filename == NULL) return 1; /* module not found in this path */ return checkload(L, (loadfunc(L, filename, name) == 0), filename);} static int searcher_Croot (lua_State *L) { const char *filename; const char *name = luaL_checkstring(L, 1);Lines 1–500 of 786. Load more
/* ** $Id: loadlib.c,v 1.124 2015/01/05 13:51:39 roberto Exp $ ** Dynamic library loader for Lua ** See Copyright Notice in lua.h ** ** This module contains an implementation of loadlib for Unix systems ** that have dlfcn, an implementation for Windows, and a stub for other ** systems. */ #define loadlib_c #define LUA_LIB #include "lprefix.h" #include <stdlib.h> #include <string.h> #include "lua.h" #include "lauxlib.h" #include "lualib.h" /* ** LUA_PATH_VAR and LUA_CPATH_VAR are the names of the environment ** variables that Lua check to set its paths. */ #if !defined(LUA_PATH_VAR) #define LUA_PATH_VAR "LUA_PATH" #endif #if !defined(LUA_CPATH_VAR) #define LUA_CPATH_VAR "LUA_CPATH" #endif #define LUA_PATHSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR #define LUA_PATHVARVERSION LUA_PATH_VAR LUA_PATHSUFFIX #define LUA_CPATHVARVERSION LUA_CPATH_VAR LUA_PATHSUFFIX /* ** LUA_PATH_SEP is the character that separates templates in a path. ** LUA_PATH_MARK is the string that marks the substitution points in a ** template. ** LUA_EXEC_DIR in a Windows path is replaced by the executable's ** directory. ** LUA_IGMARK is a mark to ignore all before it when building the ** luaopen_ function name. */ #if !defined (LUA_PATH_SEP) #define LUA_PATH_SEP ";" #endif #if !defined (LUA_PATH_MARK) #define LUA_PATH_MARK "?" #endif #if !defined (LUA_EXEC_DIR) #define LUA_EXEC_DIR "!" #endif #if !defined (LUA_IGMARK) #define LUA_IGMARK "-" #endif /* ** LUA_CSUBSEP is the character that replaces dots in submodule names ** when searching for a C loader. ** LUA_LSUBSEP is the character that replaces dots in submodule names ** when searching for a Lua loader. */ #if !defined(LUA_CSUBSEP) #define LUA_CSUBSEP LUA_DIRSEP #endif #if !defined(LUA_LSUBSEP) #define LUA_LSUBSEP LUA_DIRSEP #endif /* prefix for open functions in C libraries */ #define LUA_POF "luaopen_" /* separator for open functions in C libraries */ #define LUA_OFSEP "_" /* ** unique key for table in the registry that keeps handles ** for all loaded C libraries */ static const int CLIBS = 0; #define LIB_FAIL "open" #define setprogdir(L) ((void)0) /* ** system-dependent functions */ /* ** unload library 'lib' */ static void lsys_unloadlib (void *lib); /* ** load C library in file 'path'. If 'seeglb', load with all names in ** the library global. ** Returns the library; in case of error, returns NULL plus an ** error string in the stack. */ static void *lsys_load (lua_State *L, const char *path, int seeglb); /* ** Try to find a function named 'sym' in library 'lib'. ** Returns the function; in case of error, returns NULL plus an ** error string in the stack. */ static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym); #if defined(LUA_USE_DLOPEN) /* { */ /* ** {======================================================================== ** This is an implementation of loadlib based on the dlfcn interface. ** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD, ** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least ** as an emulation layer on top of native functions. ** ========================================================================= */ #include <dlfcn.h> /* ** Macro to covert pointer to void* to pointer to function. This cast ** is undefined according to ISO C, but POSIX assumes that it must work. ** (The '__extension__' in gnu compilers is only to avoid warnings.) */ #if defined(__GNUC__) #define cast_func(p) (__extension__ (lua_CFunction)(p)) #else #define cast_func(p) ((lua_CFunction)(p)) #endif static void lsys_unloadlib (void *lib) { dlclose(lib); } static void *lsys_load (lua_State *L, const char *path, int seeglb) { void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL)); if (lib == NULL) lua_pushstring(L, dlerror()); return lib; } static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { lua_CFunction f = cast_func(dlsym(lib, sym)); if (f == NULL) lua_pushstring(L, dlerror()); return f; } /* }====================================================== */ #elif defined(LUA_DL_DLL) /* }{ */ /* ** {====================================================================== ** This is an implementation of loadlib for Windows using native functions. ** ======================================================================= */ #include <windows.h> #undef setprogdir /* ** optional flags for LoadLibraryEx */ #if !defined(LUA_LLE_FLAGS) #define LUA_LLE_FLAGS 0 #endif static void setprogdir (lua_State *L) { char buff[MAX_PATH + 1]; char *lb; DWORD nsize = sizeof(buff)/sizeof(char); DWORD n = GetModuleFileNameA(NULL, buff, nsize); if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) luaL_error(L, "unable to get ModuleFileName"); else { *lb = '\0'; luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff); lua_remove(L, -2); /* remove original string */ } } static void pusherror (lua_State *L) { int error = GetLastError(); char buffer[128]; if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL)) lua_pushstring(L, buffer); else lua_pushfstring(L, "system error %d\n", error); } static void lsys_unloadlib (void *lib) { FreeLibrary((HMODULE)lib); } static void *lsys_load (lua_State *L, const char *path, int seeglb) { HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS); (void)(seeglb); /* not used: symbols are 'global' by default */ if (lib == NULL) pusherror(L); return lib; } static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym); if (f == NULL) pusherror(L); return f; } /* }====================================================== */ #else /* }{ */ /* ** {====================================================== ** Fallback for other systems ** ======================================================= */ #undef LIB_FAIL #define LIB_FAIL "absent" #define DLMSG "dynamic libraries not enabled; check your Lua installation" static void lsys_unloadlib (void *lib) { (void)(lib); /* not used */ } static void *lsys_load (lua_State *L, const char *path, int seeglb) { (void)(path); (void)(seeglb); /* not used */ lua_pushliteral(L, DLMSG); return NULL; } static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { (void)(lib); (void)(sym); /* not used */ lua_pushliteral(L, DLMSG); return NULL; } /* }====================================================== */ #endif /* } */ /* ** return registry.CLIBS[path] */ static void *checkclib (lua_State *L, const char *path) { void *plib; lua_rawgetp(L, LUA_REGISTRYINDEX, &CLIBS); lua_getfield(L, -1, path); plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */ lua_pop(L, 2); /* pop CLIBS table and 'plib' */ return plib; } /* ** registry.CLIBS[path] = plib -- for queries ** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries */ static void addtoclib (lua_State *L, const char *path, void *plib) { lua_rawgetp(L, LUA_REGISTRYINDEX, &CLIBS); lua_pushlightuserdata(L, plib); lua_pushvalue(L, -1); lua_setfield(L, -3, path); /* CLIBS[path] = plib */ lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */ lua_pop(L, 1); /* pop CLIBS table */ } /* ** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib ** handles in list CLIBS */ static int gctm (lua_State *L) { lua_Integer n = luaL_len(L, 1); for (; n >= 1; n--) { /* for each handle, in reverse order */ lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */ lsys_unloadlib(lua_touserdata(L, -1)); lua_pop(L, 1); /* pop handle */ } return 0; } /* error codes for 'lookforfunc' */ #define ERRLIB 1 #define ERRFUNC 2 /* ** Look for a C function named 'sym' in a dynamically loaded library ** 'path'. ** First, check whether the library is already loaded; if not, try ** to load it. ** Then, if 'sym' is '*', return true (as library has been loaded). ** Otherwise, look for symbol 'sym' in the library and push a ** C function with that symbol. ** Return 0 and 'true' or a function in the stack; in case of ** errors, return an error code and an error message in the stack. */ static int lookforfunc (lua_State *L, const char *path, const char *sym) { void *reg = checkclib(L, path); /* check loaded C libraries */ if (reg == NULL) { /* must load library? */ reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */ if (reg == NULL) return ERRLIB; /* unable to load library */ addtoclib(L, path, reg); } if (*sym == '*') { /* loading only library (no function)? */ lua_pushboolean(L, 1); /* return 'true' */ return 0; /* no errors */ } else { lua_CFunction f = lsys_sym(L, reg, sym); if (f == NULL) return ERRFUNC; /* unable to find function */ lua_pushcfunction(L, f); /* else create new function */ return 0; /* no errors */ } } static int ll_loadlib (lua_State *L) { const char *path = luaL_checkstring(L, 1); const char *init = luaL_checkstring(L, 2); int stat = lookforfunc(L, path, init); if (stat == 0) /* no errors? */ return 1; /* return the loaded function */ else { /* error; error message is on stack top */ lua_pushnil(L); lua_insert(L, -2); lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init"); return 3; /* return nil, error message, and where */ } } /* ** {====================================================== ** 'require' function ** ======================================================= */ static int readable (const char *filename) { FILE *f = fopen(filename, "r"); /* try to open file */ if (f == NULL) return 0; /* open failed */ fclose(f); return 1; } static const char *pushnexttemplate (lua_State *L, const char *path) { const char *l; while (*path == *LUA_PATH_SEP) path++; /* skip separators */ if (*path == '\0') return NULL; /* no more templates */ l = strchr(path, *LUA_PATH_SEP); /* find next separator */ if (l == NULL) l = path + strlen(path); lua_pushlstring(L, path, l - path); /* template */ return l; } static const char *searchpath (lua_State *L, const char *name, const char *path, const char *sep, const char *dirsep) { luaL_Buffer msg; /* to build error message */ luaL_buffinit(L, &msg); if (*sep != '\0') /* non-empty separator? */ name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */ while ((path = pushnexttemplate(L, path)) != NULL) { 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 */ lua_pushfstring(L, "\n\tno file '%s'", filename); lua_remove(L, -2); /* remove file name */ luaL_addvalue(&msg); /* concatenate error msg. entry */ } luaL_pushresult(&msg); /* create error message */ return NULL; /* not found */ } static int ll_searchpath (lua_State *L) { const char *f = searchpath(L, luaL_checkstring(L, 1), luaL_checkstring(L, 2), luaL_optstring(L, 3, "."), luaL_optstring(L, 4, LUA_DIRSEP)); 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 *dirsep) { const char *path; lua_getfield(L, lua_upvalueindex(1), pname); path = lua_tostring(L, -1); if (path == NULL) luaL_error(L, "'package.%s' must be a string", pname); return searchpath(L, name, path, ".", dirsep); } static int checkload (lua_State *L, int stat, const char *filename) { if (stat) { /* module loaded successfully? */ lua_pushstring(L, filename); /* will be 2nd argument to module */ return 2; /* return open function and file name */ } else return luaL_error(L, "error loading module '%s' from file '%s':\n\t%s", lua_tostring(L, 1), filename, lua_tostring(L, -1)); } static int searcher_Lua (lua_State *L) { const char *filename; const char *name = luaL_checkstring(L, 1); filename = findfile(L, name, "path", LUA_LSUBSEP); if (filename == NULL) return 1; /* module not found in this path */ return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename); } /* ** Try to find a load function for module 'modname' at file 'filename'. ** First, change '.' to '_' in 'modname'; then, if 'modname' has ** the form X-Y (that is, it has an "ignore mark"), build a function ** name "luaopen_X" and look for it. (For compatibility, if that ** fails, it also tries "luaopen_Y".) If there is no ignore mark, ** look for a function named "luaopen_modname". */ static int loadfunc (lua_State *L, const char *filename, const char *modname) { const char *openfunc; const char *mark; modname = luaL_gsub(L, modname, ".", LUA_OFSEP); mark = strchr(modname, *LUA_IGMARK); if (mark) { int stat; openfunc = lua_pushlstring(L, modname, mark - modname); openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc); stat = lookforfunc(L, filename, openfunc); if (stat != ERRFUNC) return stat; modname = mark + 1; /* else go ahead and try old-style name */ } openfunc = lua_pushfstring(L, LUA_POF"%s", modname); return lookforfunc(L, filename, openfunc); } static int searcher_C (lua_State *L) { const char *name = luaL_checkstring(L, 1); const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP); if (filename == NULL) return 1; /* module not found in this path */ return checkload(L, (loadfunc(L, filename, name) == 0), filename); } static int searcher_Croot (lua_State *L) { const char *filename; const char *name = luaL_checkstring(L, 1);