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- /*
- ** $Id: lauxlib.c,v 1.159.1.3 2008/01/21 13:20:51 roberto Exp $
- ** Auxiliary functions for building Lua libraries
- ** See Copyright Notice in lua.h
- */
- #include "lua.h"
- #include <ctype.h>
- #if defined(LUA_CROSS_COMPILER) && defined(_MSC_VER)
- #undef errno //msvc #defines errno, which interferes with our #include macro
- #else
- #include <errno.h>
- #endif
- #ifndef LUA_CROSS_COMPILER
- #include "vfs.h"
- #include "user_interface.h"
- #endif
- #include <stdlib.h>
- #include <string.h>
- #include <fcntl.h>
- /* This file uses only the official API of Lua.
- ** Any function declared here could be written as an application function.
- */
- #define lauxlib_c
- #define LUA_LIB
- #include "lauxlib.h"
- #include "lgc.h"
- #include "ldo.h"
- #include "lobject.h"
- #include "lstate.h"
- #define FREELIST_REF 0 /* free list of references */
- /* convert a stack index to positive */
- #define abs_index(L, i) ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
- lua_gettop(L) + (i) + 1)
- // Parameters for luaI_openlib
- #define LUA_USECCLOSURES 0
- #define LUA_USELIGHTFUNCTIONS 1
- //#define DEBUG_ALLOCATOR
- #ifdef DEBUG_ALLOCATOR
- #ifdef LUA_CROSS_COMPILER
- static void break_hook(void) {}
- #define ASSERT(s) if (!(s)) {break_hook();}
- #else
- #define ASSERT(s) if (!(s)) {asm ("break 0,0" ::);}
- #endif
- /*
- ** {======================================================================
- ** Diagnosticd version for realloc. This is enabled only if the
- ** DEBUG_ALLOCATOR is defined. It is a cutdown version of the allocator
- ** used in the Lua Test Suite -- a compromise between the ability catch
- ** most alloc/free errors and overruns and working within the RAM limits
- ** of the ESP8266 architecture. ONLY FOR HEAVY HACKERS
- ** =======================================================================
- */
- #define this_realloc debug_realloc
- #define MARK 0x55 /* 01010101 (a nice pattern) */
- #define MARKSIZE 2*sizeof(size_t) /* size of marks after each block */
- #define fillmem(mem,size) memset(mem, ~MARK, size)
- typedef union MemHeader MemHeader;
- union MemHeader {
- L_Umaxalign a; /* ensures maximum alignment for Header */
- struct {
- size_t size;
- MemHeader *next;
- size_t mark[2];
- };
- };
- typedef struct Memcontrol { /* memory-allocator control variables */
- MemHeader *start;
- lu_int32 numblocks;
- lu_int32 total;
- lu_int32 maxmem;
- lu_int32 memlimit;
- } Memcontrol;
- static Memcontrol mc = {NULL,0,0,0,32768*64};
- static size_t marker[2] = {0,0};
- static void scanBlocks (void) {
- MemHeader *p = mc.start;
- int i;
- char s,e;
- for (i=0; p ;i++) {
- s = memcmp(p->mark, marker, MARKSIZE) ? '<' : ' ';
- e = memcmp(cast(char *, p+1) + p->size, marker, MARKSIZE) ? '>' : ' ';
- printf("%4u %p %8lu %c %c\n", i, p, p->size, s, e);
- ASSERT(p->next);
- p = p->next;
- }
- }
- static int checkBlocks (void) {
- MemHeader *p = mc.start;
- while(p) {
- if (memcmp(p->mark, marker, MARKSIZE) ||
- memcmp(cast(char *, p+1) + p->size, marker, MARKSIZE)) {
- scanBlocks();
- return 0;
- }
- p = p->next;
- }
- return 1;
- }
- static void freeblock (MemHeader *block) {
- if (block) {
- MemHeader *p = mc.start;
- MemHeader *next = block->next;
- size_t size = block->size;
- ASSERT(checkBlocks());
- if (p == block) {
- mc.start = next;
- } else {
- while (p->next != block) {
- ASSERT(p);
- p = p->next;
- }
- p->next = next;
- }
- fillmem(block, sizeof(MemHeader) + size + MARKSIZE); /* erase block */
- free(block); /* actually free block */
- mc.numblocks--; /* update counts */
- mc.total -= size;
- }
- }
- void *debug_realloc (void *b, size_t oldsize, size_t size) {
- MemHeader *block = cast(MemHeader *, b);
- ASSERT(checkBlocks());
- if (!marker[0]) memset(marker, MARK, MARKSIZE);
- if (block == NULL) {
- oldsize = 0;
- } else {
- block--; /* go to real header */
- ASSERT(!memcmp(block->mark, marker, MARKSIZE))
- ASSERT(oldsize == block->size);
- ASSERT(!memcmp(cast(char *, b)+oldsize, marker, MARKSIZE));
- }
- if (size == 0) {
- freeblock(block);
- return NULL;
- } else if (size > oldsize && mc.total+size-oldsize > mc.memlimit)
- return NULL; /* fake a memory allocation error */
- else {
- MemHeader *newblock;
- size_t commonsize = (oldsize < size) ? oldsize : size;
- size_t realsize = sizeof(MemHeader) + size + MARKSIZE;
- newblock = cast(MemHeader *, malloc(realsize)); /* alloc a new block */
- if (newblock == NULL)
- return NULL; /* really out of memory? */
- if (block) {
- memcpy(newblock + 1, block + 1, commonsize); /* copy old contents */
- freeblock(block); /* erase (and check) old copy */
- }
- /* initialize new part of the block with something weird */
- if (size > commonsize)
- fillmem(cast(char *, newblock + 1) + commonsize, size - commonsize);
- /* initialize marks after block */
- memset(newblock->mark, MARK, MARKSIZE);
- newblock->size = size;
- newblock->next = mc.start;
- mc.start = newblock;
- memset(cast(char *, newblock + 1)+ size, MARK, MARKSIZE);
- mc.total += size;
- if (mc.total > mc.maxmem)
- mc.maxmem = mc.total;
- mc.numblocks++;
- return (newblock + 1);
- }
- }
- /* }====================================================================== */
- #else
- #define this_realloc(p,os,s) realloc(p,s)
- #endif /* DEBUG_ALLOCATOR */
- /*
- ** {======================================================
- ** Error-report functions
- ** =======================================================
- */
- LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
- lua_Debug ar;
- if (!lua_getstack(L, 0, &ar)) /* no stack frame? */
- return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
- lua_getinfo(L, "n", &ar);
- if (strcmp(ar.namewhat, "method") == 0) {
- narg--; /* do not count `self' */
- if (narg == 0) /* error is in the self argument itself? */
- return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
- ar.name, extramsg);
- }
- if (ar.name == NULL)
- ar.name = "?";
- return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
- narg, ar.name, extramsg);
- }
- LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
- const char *msg = lua_pushfstring(L, "%s expected, got %s",
- tname, lua_typename(L, narg));
- return luaL_argerror(L, narg, msg);
- }
- static void tag_error (lua_State *L, int narg, int tag) {
- luaL_typerror(L, narg, lua_typename(L, tag));
- }
- LUALIB_API void luaL_where (lua_State *L, int level) {
- lua_Debug ar;
- if (lua_getstack(L, level, &ar)) { /* check function at level */
- lua_getinfo(L, "Sl", &ar); /* get info about it */
- if (ar.currentline > 0) { /* is there info? */
- lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
- return;
- }
- }
- lua_pushliteral(L, ""); /* else, no information available... */
- }
- LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
- va_list argp;
- va_start(argp, fmt);
- luaL_where(L, 1);
- lua_pushvfstring(L, fmt, argp);
- va_end(argp);
- lua_concat(L, 2);
- return lua_error(L);
- }
- /* }====================================================== */
- LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
- const char *const lst[]) {
- const char *name = (def) ? luaL_optstring(L, narg, def) :
- luaL_checkstring(L, narg);
- int i;
- for (i=0; lst[i]; i++)
- if (strcmp(lst[i], name) == 0)
- return i;
- return luaL_argerror(L, narg,
- lua_pushfstring(L, "invalid option " LUA_QS, name));
- }
- LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
- lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get registry.name */
- if (!lua_isnil(L, -1)) /* name already in use? */
- return 0; /* leave previous value on top, but return 0 */
- lua_pop(L, 1);
- lua_newtable(L); /* create metatable */
- lua_pushvalue(L, -1);
- lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
- return 1;
- }
- LUALIB_API int luaL_rometatable (lua_State *L, const char* tname, const ROTable *p) {
- lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get registry.name */
- if (!lua_isnil(L, -1)) /* name already in use? */
- return 0; /* leave previous value on top, but return 0 */
- lua_pop(L, 1);
- lua_pushrotable(L, p);
- lua_pushvalue(L, -1);
- lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
- return 1;
- }
- LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
- void *p = lua_touserdata(L, ud);
- if (p != NULL) { /* value is a userdata? */
- if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
- lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
- if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */
- lua_pop(L, 2); /* remove both metatables */
- return p;
- }
- }
- }
- luaL_typerror(L, ud, tname); /* else error */
- return NULL; /* to avoid warnings */
- }
- LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
- if (!lua_checkstack(L, space))
- luaL_error(L, "stack overflow (%s)", mes);
- }
- LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
- if (lua_type(L, narg) != t)
- tag_error(L, narg, t);
- }
- LUALIB_API void luaL_checkany (lua_State *L, int narg) {
- if (lua_type(L, narg) == LUA_TNONE)
- luaL_argerror(L, narg, "value expected");
- }
- LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
- const char *s = lua_tolstring(L, narg, len);
- if (!s) tag_error(L, narg, LUA_TSTRING);
- return s;
- }
- LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
- const char *def, size_t *len) {
- if (lua_isnoneornil(L, narg)) {
- if (len)
- *len = (def ? strlen(def) : 0);
- return def;
- }
- else return luaL_checklstring(L, narg, len);
- }
- LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
- lua_Number d = lua_tonumber(L, narg);
- if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
- tag_error(L, narg, LUA_TNUMBER);
- return d;
- }
- LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
- return luaL_opt(L, luaL_checknumber, narg, def);
- }
- LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
- lua_Integer d = lua_tointeger(L, narg);
- if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
- tag_error(L, narg, LUA_TNUMBER);
- return d;
- }
- LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
- lua_Integer def) {
- return luaL_opt(L, luaL_checkinteger, narg, def);
- }
- LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
- if (!lua_getmetatable(L, obj)) /* no metatable? */
- return 0;
- lua_pushstring(L, event);
- lua_rawget(L, -2);
- if (lua_isnil(L, -1)) {
- lua_pop(L, 2); /* remove metatable and metafield */
- return 0;
- }
- else {
- lua_remove(L, -2); /* remove only metatable */
- return 1;
- }
- }
- LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
- obj = abs_index(L, obj);
- if (!luaL_getmetafield(L, obj, event)) /* no metafield? */
- return 0;
- lua_pushvalue(L, obj);
- lua_call(L, 1, 1);
- return 1;
- }
- LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
- const luaL_Reg *l) {
- luaI_openlib(L, libname, l, 0, LUA_USECCLOSURES);
- }
- LUALIB_API void (luaL_register_light) (lua_State *L, const char *libname,
- const luaL_Reg *l) {
- luaI_openlib(L, libname, l, 0, LUA_USELIGHTFUNCTIONS);
- }
- static int libsize (const luaL_Reg *l) {
- int size = 0;
- for (; l->name; l++) size++;
- return size;
- }
- LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
- const luaL_Reg *l, int nup, int ftype) {
- if (libname) {
- int size = libsize(l);
- /* check whether lib already exists */
- luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
- lua_getfield(L, -1, libname); /* get _LOADED[libname] */
- if (!lua_istable(L, -1)) { /* not found? */
- lua_pop(L, 1); /* remove previous result */
- /* try global variable (and create one if it does not exist) */
- if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
- luaL_error(L, "name conflict for module " LUA_QS, libname);
- lua_pushvalue(L, -1);
- lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
- }
- lua_remove(L, -2); /* remove _LOADED table */
- lua_insert(L, -(nup+1)); /* move library table to below upvalues */
- }
- for (; l->name; l++) {
- int i;
- for (i=0; i<nup; i++) /* copy upvalues to the top */
- lua_pushvalue(L, -nup);
- if (ftype == LUA_USELIGHTFUNCTIONS)
- lua_pushcfunction(L, l->func);
- else
- lua_pushcclosure(L, l->func, nup);
- lua_setfield(L, -(nup+2), l->name);
- }
- lua_pop(L, nup); /* remove upvalues */
- }
- /*
- ** {======================================================
- ** getn-setn: size for arrays
- ** =======================================================
- */
- #if defined(LUA_COMPAT_GETN)
- static int checkint (lua_State *L, int topop) {
- int n = (lua_type(L, -1) == LUA_TNUMBER) ? lua_tointeger(L, -1) : -1;
- lua_pop(L, topop);
- return n;
- }
- static void getsizes (lua_State *L) {
- lua_getfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");
- if (lua_isnil(L, -1)) { /* no `size' table? */
- lua_pop(L, 1); /* remove nil */
- lua_newtable(L); /* create it */
- lua_pushvalue(L, -1); /* `size' will be its own metatable */
- lua_setmetatable(L, -2);
- lua_pushliteral(L, "kv");
- lua_setfield(L, -2, "__mode"); /* metatable(N).__mode = "kv" */
- lua_pushvalue(L, -1);
- lua_setfield(L, LUA_REGISTRYINDEX, "LUA_SIZES"); /* store in register */
- }
- }
- LUALIB_API void luaL_setn (lua_State *L, int t, int n) {
- t = abs_index(L, t);
- lua_pushliteral(L, "n");
- lua_rawget(L, t);
- if (checkint(L, 1) >= 0) { /* is there a numeric field `n'? */
- lua_pushliteral(L, "n"); /* use it */
- lua_pushinteger(L, n);
- lua_rawset(L, t);
- }
- else { /* use `sizes' */
- getsizes(L);
- lua_pushvalue(L, t);
- lua_pushinteger(L, n);
- lua_rawset(L, -3); /* sizes[t] = n */
- lua_pop(L, 1); /* remove `sizes' */
- }
- }
- LUALIB_API int luaL_getn (lua_State *L, int t) {
- int n;
- t = abs_index(L, t);
- lua_pushliteral(L, "n"); /* try t.n */
- lua_rawget(L, t);
- if ((n = checkint(L, 1)) >= 0) return n;
- getsizes(L); /* else try sizes[t] */
- lua_pushvalue(L, t);
- lua_rawget(L, -2);
- if ((n = checkint(L, 2)) >= 0) return n;
- return (int)lua_objlen(L, t);
- }
- #endif
- /* }====================================================== */
- LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
- const char *r) {
- const char *wild;
- size_t l = strlen(p);
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- while ((wild = strstr(s, p)) != NULL) {
- luaL_addlstring(&b, s, wild - s); /* push prefix */
- luaL_addstring(&b, r); /* push replacement in place of pattern */
- s = wild + l; /* continue after `p' */
- }
- luaL_addstring(&b, s); /* push last suffix */
- luaL_pushresult(&b);
- return lua_tostring(L, -1);
- }
- LUALIB_API const char *luaL_findtable (lua_State *L, int idx,
- const char *fname, int szhint) {
- const char *e;
- lua_pushvalue(L, idx);
- do {
- e = strchr(fname, '.');
- if (e == NULL) e = fname + strlen(fname);
- lua_pushlstring(L, fname, e - fname);
- lua_rawget(L, -2);
- if (lua_isnil(L, -1)) { /* no such field? */
- lua_pop(L, 1); /* remove this nil */
- lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
- lua_pushlstring(L, fname, e - fname);
- lua_pushvalue(L, -2);
- lua_settable(L, -4); /* set new table into field */
- }
- else if (!lua_istable(L, -1)) { /* field has a non-table value? */
- lua_pop(L, 2); /* remove table and value */
- return fname; /* return problematic part of the name */
- }
- lua_remove(L, -2); /* remove previous table */
- fname = e + 1;
- } while (*e == '.');
- return NULL;
- }
- /*
- ** {======================================================
- ** Generic Buffer manipulation
- ** =======================================================
- */
- #define bufflen(B) ((B)->p - (B)->buffer)
- #define bufffree(B) ((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
- #define LIMIT (LUA_MINSTACK/2)
- static int emptybuffer (luaL_Buffer *B) {
- size_t l = bufflen(B);
- if (l == 0) return 0; /* put nothing on stack */
- else {
- lua_pushlstring(B->L, B->buffer, l);
- B->p = B->buffer;
- B->lvl++;
- return 1;
- }
- }
- static void adjuststack (luaL_Buffer *B) {
- if (B->lvl > 1) {
- lua_State *L = B->L;
- int toget = 1; /* number of levels to concat */
- size_t toplen = lua_strlen(L, -1);
- do {
- size_t l = lua_strlen(L, -(toget+1));
- if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
- toplen += l;
- toget++;
- }
- else break;
- } while (toget < B->lvl);
- lua_concat(L, toget);
- B->lvl = B->lvl - toget + 1;
- }
- }
- LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
- if (emptybuffer(B))
- adjuststack(B);
- return B->buffer;
- }
- LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
- while (l--)
- luaL_addchar(B, *s++);
- }
- LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
- luaL_addlstring(B, s, strlen(s));
- }
- LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
- emptybuffer(B);
- lua_concat(B->L, B->lvl);
- B->lvl = 1;
- }
- LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
- lua_State *L = B->L;
- size_t vl;
- const char *s = lua_tolstring(L, -1, &vl);
- if (vl <= bufffree(B)) { /* fit into buffer? */
- memcpy(B->p, s, vl); /* put it there */
- B->p += vl;
- lua_pop(L, 1); /* remove from stack */
- }
- else {
- if (emptybuffer(B))
- lua_insert(L, -2); /* put buffer before new value */
- B->lvl++; /* add new value into B stack */
- adjuststack(B);
- }
- }
- LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
- B->L = L;
- B->p = B->buffer;
- B->lvl = 0;
- }
- /* }====================================================== */
- LUALIB_API int luaL_ref (lua_State *L, int t) {
- int ref;
- t = abs_index(L, t);
- if (lua_isnil(L, -1)) {
- lua_pop(L, 1); /* remove from stack */
- return LUA_REFNIL; /* `nil' has a unique fixed reference */
- }
- lua_rawgeti(L, t, FREELIST_REF); /* get first free element */
- ref = (int)lua_tointeger(L, -1); /* ref = t[FREELIST_REF] */
- lua_pop(L, 1); /* remove it from stack */
- if (ref != 0) { /* any free element? */
- lua_rawgeti(L, t, ref); /* remove it from list */
- lua_rawseti(L, t, FREELIST_REF); /* (t[FREELIST_REF] = t[ref]) */
- }
- else { /* no free elements */
- ref = (int)lua_objlen(L, t);
- ref++; /* create new reference */
- }
- lua_rawseti(L, t, ref);
- return ref;
- }
- LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
- if (ref >= 0) {
- t = abs_index(L, t);
- lua_rawgeti(L, t, FREELIST_REF);
- lua_rawseti(L, t, ref); /* t[ref] = t[FREELIST_REF] */
- lua_pushinteger(L, ref);
- lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */
- }
- }
- LUALIB_API void (luaL_reref) (lua_State *L, int t, int *ref) {
- int reft;
- /*
- * If the ref is positive and the entry in table t exists then
- * overwrite the value otherwise fall through to luaL_ref()
- */
- if (ref) {
- if (*ref >= 0) {
- t = abs_index(L, t);
- lua_rawgeti(L, t, *ref);
- reft = lua_type(L, -1);
- lua_pop(L, 1);
- if (reft != LUA_TNIL) {
- lua_rawseti(L, t, *ref);
- return;
- }
- }
- *ref = luaL_ref(L, t);
- }
- }
- /*
- ** {======================================================
- ** Load functions
- ** =======================================================
- */
- typedef struct LoadF {
- int extraline;
- #ifdef LUA_CROSS_COMPILER
- FILE *f;
- #else
- int f;
- #endif
- char buff[LUAL_BUFFERSIZE];
- } LoadF;
- #ifdef LUA_CROSS_COMPILER
- # define freopen_bin(f,fn) freopen(f,"rb",fn)
- # define read_buff(b,f) fread(b, 1, sizeof (b), f)
- #else
- # define strerror(n) ""
- #undef feof
- # define feof(f) vfs_eof(f)
- #undef fopen
- # define fopen(f, m) vfs_open(f, m)
- # define freopen_bin(fn,f) ((void) vfs_close(f), vfs_open(fn, "r"))
- #undef getc
- # define getc(f) vfs_getc(f)
- #undef ungetc
- # define ungetc(c,f) vfs_ungetc(c, f)
- # define read_buff(b,f) vfs_read(f, b, sizeof (b))
- #endif
- static const char *getF (lua_State *L, void *ud, size_t *size) {
- LoadF *lf = (LoadF *)ud;
- (void)L;
- if (lf->extraline) {
- lf->extraline = 0;
- *size = 1;
- return "\n";
- }
- if (feof(lf->f)) return NULL;
- *size = read_buff(lf->buff, lf->f);
- return (*size > 0) ? lf->buff : NULL;
- }
- static int errfile (lua_State *L, const char *what, int fnameindex) {
- const char *serr = strerror(errno);
- const char *filename = lua_tostring(L, fnameindex) + 1;
- lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
- lua_remove(L, fnameindex);
- return LUA_ERRFILE;
- }
- LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
- LoadF lf;
- int status, readstatus;
- int c;
- int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
- lf.extraline = 0;
- if (filename == NULL) {
- #ifdef LUA_CROSS_COMPILER
- lua_pushliteral(L, "=stdin");
- lf.f = stdin;
- #else
- return luaL_error(L, "filename is NULL");
- #endif
- }
- else {
- lua_pushfstring(L, "@%s", filename);
- lf.f = fopen(filename, "r");
- if (!lf.f) return errfile(L, "open", fnameindex);
- }
- c = getc(lf.f);
- if (c == '#') { /* Unix exec. file? */
- lf.extraline = 1;
- while ((c = getc(lf.f)) != EOF && c != '\n') ; /* skip first line */
- if (c == '\n') c = getc(lf.f);
- }
- if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */
- lf.f = freopen_bin(filename, lf.f); /* reopen in binary mode */
- if (!lf.f) return errfile(L, "reopen", fnameindex);
- /* skip eventual `#!...' */
- while ((c = getc(lf.f)) != EOF && c != LUA_SIGNATURE[0]) {}
- lf.extraline = 0;
- }
- ungetc(c, lf.f);
- status = lua_load(L, getF, &lf, lua_tostring(L, -1));
- #ifdef LUA_CROSS_COMPILER
- readstatus = ferror(lf.f);
- if (filename) fclose(lf.f); /* close file (even in case of errors) */
- if (readstatus) {
- lua_settop(L, fnameindex); /* ignore results from `lua_load' */
- return errfile(L, "read", fnameindex);
- }
- #else
- (void) readstatus; /* avoid compile error */
- if (filename) vfs_close(lf.f); /* close file (even in case of errors) */
- #endif
- lua_remove(L, fnameindex);
- return status;
- }
- typedef struct LoadS {
- const char *s;
- size_t size;
- } LoadS;
- static const char *getS (lua_State *L, void *ud, size_t *size) {
- LoadS *ls = (LoadS *)ud;
- (void)L;
- if (L == NULL && size == NULL) // direct mode check
- return NULL;
- if (ls->size == 0) return NULL;
- *size = ls->size;
- ls->size = 0;
- return ls->s;
- }
- LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
- const char *name) {
- LoadS ls;
- ls.s = buff;
- ls.size = size;
- return lua_load(L, getS, &ls, name);
- }
- LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s) {
- return luaL_loadbuffer(L, s, strlen(s), s);
- }
- /* }====================================================== */
- static int l_check_memlimit(lua_State *L, size_t needbytes) {
- global_State *g = G(L);
- int cycle_count = 0;
- lu_mem limit = g->memlimit - needbytes;
- /* don't allow allocation if it requires more memory then the total limit. */
- if (needbytes > g->memlimit) return 1;
- /* make sure the GC is not disabled. */
- if (!is_block_gc(L)) {
- while (g->totalbytes >= limit) {
- /* only allow the GC to finished atleast 1 full cycle. */
- if (g->gcstate == GCSpause && ++cycle_count > 1) break;
- luaC_step(L);
- }
- }
- return (g->totalbytes >= limit) ? 1 : 0;
- }
- static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
- lua_State *L = (lua_State *)ud;
- int mode = L == NULL ? 0 : G(L)->egcmode;
- void *nptr;
- if (nsize == 0) {
- #ifdef DEBUG_ALLOCATOR
- return (void *)this_realloc(ptr, osize, nsize);
- #else
- free(ptr);
- return NULL;
- #endif
- }
- if (L != NULL && (mode & EGC_ALWAYS)) /* always collect memory if requested */
- luaC_fullgc(L);
- #ifndef LUA_CROSS_COMPILER
- if (L != NULL && (mode & EGC_ON_MEM_LIMIT) && G(L)->memlimit < 0 &&
- (system_get_free_heap_size() < (-G(L)->memlimit)))
- luaC_fullgc(L);
- #endif
- if(nsize > osize && L != NULL) {
- #if defined(LUA_STRESS_EMERGENCY_GC)
- luaC_fullgc(L);
- #endif
- if(G(L)->memlimit > 0 && (mode & EGC_ON_MEM_LIMIT) && l_check_memlimit(L, nsize - osize))
- return NULL;
- }
- nptr = (void *)this_realloc(ptr, osize, nsize);
- if (nptr == NULL && L != NULL && (mode & EGC_ON_ALLOC_FAILURE)) {
- luaC_fullgc(L); /* emergency full collection. */
- nptr = (void *)this_realloc(ptr, osize, nsize); /* try allocation again */
- }
- return nptr;
- }
- LUALIB_API void luaL_assertfail(const char *file, int line, const char *message) {
- dbg_printf("ASSERT@%s(%d): %s\n", file, line, message);
- #if defined(LUA_CROSS_COMPILER)
- exit(1);
- #endif
- }
- #ifdef DEVELOPMENT_USE_GDB
- /*
- * This is a simple stub used by lua_assert() if DEVELOPMENT_USE_GDB is defined.
- * Instead of crashing out with an assert error, this hook starts the GDB remote
- * stub if not already running and then issues a break. The rationale here is
- * that when testing the developer might be using screen/PuTTY to work interactively
- * with the Lua Interpreter via UART0. However if an assert triggers, then there
- * is the option to exit the interactive session and start the Xtensa remote GDB
- * which will then sync up with the remote GDB client to allow forensics of the error.
- */
- extern void gdbstub_init(void);
- extern void gdbstub_redirect_output(int);
- LUALIB_API void lua_debugbreak (void) {
- #ifdef LUA_CROSS_COMPILER
- puts(" lua_debugbreak "); /* allows gdb BT analysis of assert fails */
- #else
- static int repeat_entry = 0;
- if (repeat_entry == 0) {
- dbg_printf("Start up the gdb stub if not already started\n");
- gdbstub_init();
- gdbstub_redirect_output(1);
- repeat_entry = 1;
- }
- asm("break 0,0" ::);
- #endif
- }
- #endif
- static int panic (lua_State *L) {
- (void)L; /* to avoid warnings */
- lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",
- lua_tostring(L, -1));
- while (1) {}
- return 0;
- }
- LUALIB_API lua_State *luaL_newstate (void) {
- lua_State *L = lua_newstate(l_alloc, NULL);
- lua_setallocf(L, l_alloc, L); /* allocator need lua_State. */
- if (L) lua_atpanic(L, &panic);
- return L;
- }
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