--- /dev/null
+/*
+** $Id: lauxlib.c,v 1.286 2016/01/08 15:33:09 roberto Exp $
+** Auxiliary functions for building Lua libraries
+** See Copyright Notice in lua.h
+*/
+
+#define lauxlib_c
+#define LUA_LIB
+
+#include "lprefix.h"
+
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/*
+** This file uses only the official API of Lua.
+** Any function declared here could be written as an application function.
+*/
+
+#include "lua.h"
+
+#include "lauxlib.h"
+
+
+/*
+** {======================================================
+** Traceback
+** =======================================================
+*/
+
+
+#define LEVELS1 10 /* size of the first part of the stack */
+#define LEVELS2 11 /* size of the second part of the stack */
+
+
+
+/*
+** search for 'objidx' in table at index -1.
+** return 1 + string at top if find a good name.
+*/
+static int findfield (lua_State *L, int objidx, int level) {
+ if (level == 0 || !lua_istable(L, -1))
+ return 0; /* not found */
+ lua_pushnil(L); /* start 'next' loop */
+ while (lua_next(L, -2)) { /* for each pair in table */
+ if (lua_type(L, -2) == LUA_TSTRING) { /* ignore non-string keys */
+ if (lua_rawequal(L, objidx, -1)) { /* found object? */
+ lua_pop(L, 1); /* remove value (but keep name) */
+ return 1;
+ }
+ else if (findfield(L, objidx, level - 1)) { /* try recursively */
+ lua_remove(L, -2); /* remove table (but keep name) */
+ lua_pushliteral(L, ".");
+ lua_insert(L, -2); /* place '.' between the two names */
+ lua_concat(L, 3);
+ return 1;
+ }
+ }
+ lua_pop(L, 1); /* remove value */
+ }
+ return 0; /* not found */
+}
+
+
+/*
+** Search for a name for a function in all loaded modules
+** (registry._LOADED).
+*/
+static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {
+ int top = lua_gettop(L);
+ lua_getinfo(L, "f", ar); /* push function */
+ lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
+ if (findfield(L, top + 1, 2)) {
+ const char *name = lua_tostring(L, -1);
+ if (strncmp(name, "_G.", 3) == 0) { /* name start with '_G.'? */
+ lua_pushstring(L, name + 3); /* push name without prefix */
+ lua_remove(L, -2); /* remove original name */
+ }
+ lua_copy(L, -1, top + 1); /* move name to proper place */
+ lua_pop(L, 2); /* remove pushed values */
+ return 1;
+ }
+ else {
+ lua_settop(L, top); /* remove function and global table */
+ return 0;
+ }
+}
+
+
+static void pushfuncname (lua_State *L, lua_Debug *ar) {
+ if (pushglobalfuncname(L, ar)) { /* try first a global name */
+ lua_pushfstring(L, "function '%s'", lua_tostring(L, -1));
+ lua_remove(L, -2); /* remove name */
+ }
+ else if (*ar->namewhat != '\0') /* is there a name from code? */
+ lua_pushfstring(L, "%s '%s'", ar->namewhat, ar->name); /* use it */
+ else if (*ar->what == 'm') /* main? */
+ lua_pushliteral(L, "main chunk");
+ else if (*ar->what != 'C') /* for Lua functions, use <file:line> */
+ lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);
+ else /* nothing left... */
+ lua_pushliteral(L, "?");
+}
+
+
+static int lastlevel (lua_State *L) {
+ lua_Debug ar;
+ int li = 1, le = 1;
+ /* find an upper bound */
+ while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }
+ /* do a binary search */
+ while (li < le) {
+ int m = (li + le)/2;
+ if (lua_getstack(L, m, &ar)) li = m + 1;
+ else le = m;
+ }
+ return le - 1;
+}
+
+
+LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1,
+ const char *msg, int level) {
+ lua_Debug ar;
+ int top = lua_gettop(L);
+ int last = lastlevel(L1);
+ int n1 = (last - level > LEVELS1 + LEVELS2) ? LEVELS1 : -1;
+ if (msg)
+ lua_pushfstring(L, "%s\n", msg);
+ luaL_checkstack(L, 10, NULL);
+ lua_pushliteral(L, "stack traceback:");
+ while (lua_getstack(L1, level++, &ar)) {
+ if (n1-- == 0) { /* too many levels? */
+ lua_pushliteral(L, "\n\t..."); /* add a '...' */
+ level = last - LEVELS2 + 1; /* and skip to last ones */
+ }
+ else {
+ lua_getinfo(L1, "Slnt", &ar);
+ lua_pushfstring(L, "\n\t%s:", ar.short_src);
+ if (ar.currentline > 0)
+ lua_pushfstring(L, "%d:", ar.currentline);
+ lua_pushliteral(L, " in ");
+ pushfuncname(L, &ar);
+ if (ar.istailcall)
+ lua_pushliteral(L, "\n\t(...tail calls...)");
+ lua_concat(L, lua_gettop(L) - top);
+ }
+ }
+ lua_concat(L, lua_gettop(L) - top);
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Error-report functions
+** =======================================================
+*/
+
+LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {
+ lua_Debug ar;
+ if (!lua_getstack(L, 0, &ar)) /* no stack frame? */
+ return luaL_error(L, "bad argument #%d (%s)", arg, extramsg);
+ lua_getinfo(L, "n", &ar);
+ if (strcmp(ar.namewhat, "method") == 0) {
+ arg--; /* do not count 'self' */
+ if (arg == 0) /* error is in the self argument itself? */
+ return luaL_error(L, "calling '%s' on bad self (%s)",
+ ar.name, extramsg);
+ }
+ if (ar.name == NULL)
+ ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";
+ return luaL_error(L, "bad argument #%d to '%s' (%s)",
+ arg, ar.name, extramsg);
+}
+
+
+static int typeerror (lua_State *L, int arg, const char *tname) {
+ const char *msg;
+ const char *typearg; /* name for the type of the actual argument */
+ if (luaL_getmetafield(L, arg, "__name") == LUA_TSTRING)
+ typearg = lua_tostring(L, -1); /* use the given type name */
+ else if (lua_type(L, arg) == LUA_TLIGHTUSERDATA)
+ typearg = "light userdata"; /* special name for messages */
+ else
+ typearg = luaL_typename(L, arg); /* standard name */
+ msg = lua_pushfstring(L, "%s expected, got %s", tname, typearg);
+ return luaL_argerror(L, arg, msg);
+}
+
+
+static void tag_error (lua_State *L, int arg, int tag) {
+ typeerror(L, arg, lua_typename(L, tag));
+}
+
+
+/*
+** The use of 'lua_pushfstring' ensures this function does not
+** need reserved stack space when called.
+*/
+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_pushfstring(L, ""); /* else, no information available... */
+}
+
+
+/*
+** Again, the use of 'lua_pushvfstring' ensures this function does
+** not need reserved stack space when called. (At worst, it generates
+** an error with "stack overflow" instead of the given message.)
+*/
+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_fileresult (lua_State *L, int stat, const char *fname) {
+ int en = errno; /* calls to Lua API may change this value */
+ if (stat) {
+ lua_pushboolean(L, 1);
+ return 1;
+ }
+ else {
+ lua_pushnil(L);
+ if (fname)
+ lua_pushfstring(L, "%s: %s", fname, strerror(en));
+ else
+ lua_pushstring(L, strerror(en));
+ lua_pushinteger(L, en);
+ return 3;
+ }
+}
+
+
+#if !defined(l_inspectstat) /* { */
+
+#if defined(LUA_USE_POSIX)
+
+#include <sys/wait.h>
+
+/*
+** use appropriate macros to interpret 'pclose' return status
+*/
+#define l_inspectstat(stat,what) \
+ if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \
+ else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; }
+
+#else
+
+#define l_inspectstat(stat,what) /* no op */
+
+#endif
+
+#endif /* } */
+
+
+LUALIB_API int luaL_execresult (lua_State *L, int stat) {
+ const char *what = "exit"; /* type of termination */
+ if (stat == -1) /* error? */
+ return luaL_fileresult(L, 0, NULL);
+ else {
+ l_inspectstat(stat, what); /* interpret result */
+ if (*what == 'e' && stat == 0) /* successful termination? */
+ lua_pushboolean(L, 1);
+ else
+ lua_pushnil(L);
+ lua_pushstring(L, what);
+ lua_pushinteger(L, stat);
+ return 3; /* return true/nil,what,code */
+ }
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Userdata's metatable manipulation
+** =======================================================
+*/
+
+LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
+ if (luaL_getmetatable(L, tname) != LUA_TNIL) /* name already in use? */
+ return 0; /* leave previous value on top, but return 0 */
+ lua_pop(L, 1);
+ lua_createtable(L, 0, 2); /* create metatable */
+ lua_pushstring(L, tname);
+ lua_setfield(L, -2, "__name"); /* metatable.__name = tname */
+ lua_pushvalue(L, -1);
+ lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
+ return 1;
+}
+
+
+LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) {
+ luaL_getmetatable(L, tname);
+ lua_setmetatable(L, -2);
+}
+
+
+LUALIB_API void *luaL_testudata (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? */
+ luaL_getmetatable(L, tname); /* get correct metatable */
+ if (!lua_rawequal(L, -1, -2)) /* not the same? */
+ p = NULL; /* value is a userdata with wrong metatable */
+ lua_pop(L, 2); /* remove both metatables */
+ return p;
+ }
+ }
+ return NULL; /* value is not a userdata with a metatable */
+}
+
+
+LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
+ void *p = luaL_testudata(L, ud, tname);
+ if (p == NULL) typeerror(L, ud, tname);
+ return p;
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Argument check functions
+** =======================================================
+*/
+
+LUALIB_API int luaL_checkoption (lua_State *L, int arg, const char *def,
+ const char *const lst[]) {
+ const char *name = (def) ? luaL_optstring(L, arg, def) :
+ luaL_checkstring(L, arg);
+ int i;
+ for (i=0; lst[i]; i++)
+ if (strcmp(lst[i], name) == 0)
+ return i;
+ return luaL_argerror(L, arg,
+ lua_pushfstring(L, "invalid option '%s'", name));
+}
+
+
+/*
+** Ensures the stack has at least 'space' extra slots, raising an error
+** if it cannot fulfill the request. (The error handling needs a few
+** extra slots to format the error message. In case of an error without
+** this extra space, Lua will generate the same 'stack overflow' error,
+** but without 'msg'.)
+*/
+LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {
+ if (!lua_checkstack(L, space)) {
+ if (msg)
+ luaL_error(L, "stack overflow (%s)", msg);
+ else
+ luaL_error(L, "stack overflow");
+ }
+}
+
+
+LUALIB_API void luaL_checktype (lua_State *L, int arg, int t) {
+ if (lua_type(L, arg) != t)
+ tag_error(L, arg, t);
+}
+
+
+LUALIB_API void luaL_checkany (lua_State *L, int arg) {
+ if (lua_type(L, arg) == LUA_TNONE)
+ luaL_argerror(L, arg, "value expected");
+}
+
+
+LUALIB_API const char *luaL_checklstring (lua_State *L, int arg, size_t *len) {
+ const char *s = lua_tolstring(L, arg, len);
+ if (!s) tag_error(L, arg, LUA_TSTRING);
+ return s;
+}
+
+
+LUALIB_API const char *luaL_optlstring (lua_State *L, int arg,
+ const char *def, size_t *len) {
+ if (lua_isnoneornil(L, arg)) {
+ if (len)
+ *len = (def ? strlen(def) : 0);
+ return def;
+ }
+ else return luaL_checklstring(L, arg, len);
+}
+
+
+LUALIB_API lua_Number luaL_checknumber (lua_State *L, int arg) {
+ int isnum;
+ lua_Number d = lua_tonumberx(L, arg, &isnum);
+ if (!isnum)
+ tag_error(L, arg, LUA_TNUMBER);
+ return d;
+}
+
+
+LUALIB_API lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number def) {
+ return luaL_opt(L, luaL_checknumber, arg, def);
+}
+
+
+static void interror (lua_State *L, int arg) {
+ if (lua_isnumber(L, arg))
+ luaL_argerror(L, arg, "number has no integer representation");
+ else
+ tag_error(L, arg, LUA_TNUMBER);
+}
+
+
+LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int arg) {
+ int isnum;
+ lua_Integer d = lua_tointegerx(L, arg, &isnum);
+ if (!isnum) {
+ interror(L, arg);
+ }
+ return d;
+}
+
+
+LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int arg,
+ lua_Integer def) {
+ return luaL_opt(L, luaL_checkinteger, arg, def);
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Generic Buffer manipulation
+** =======================================================
+*/
+
+/* userdata to box arbitrary data */
+typedef struct UBox {
+ void *box;
+ size_t bsize;
+} UBox;
+
+
+static void *resizebox (lua_State *L, int idx, size_t newsize) {
+ void *ud;
+ lua_Alloc allocf = lua_getallocf(L, &ud);
+ UBox *box = (UBox *)lua_touserdata(L, idx);
+ void *temp = allocf(ud, box->box, box->bsize, newsize);
+ if (temp == NULL && newsize > 0) { /* allocation error? */
+ resizebox(L, idx, 0); /* free buffer */
+ luaL_error(L, "not enough memory for buffer allocation");
+ }
+ box->box = temp;
+ box->bsize = newsize;
+ return temp;
+}
+
+
+static int boxgc (lua_State *L) {
+ resizebox(L, 1, 0);
+ return 0;
+}
+
+
+static void *newbox (lua_State *L, size_t newsize) {
+ UBox *box = (UBox *)lua_newuserdata(L, sizeof(UBox));
+ box->box = NULL;
+ box->bsize = 0;
+ if (luaL_newmetatable(L, "LUABOX")) { /* creating metatable? */
+ lua_pushcfunction(L, boxgc);
+ lua_setfield(L, -2, "__gc"); /* metatable.__gc = boxgc */
+ }
+ lua_setmetatable(L, -2);
+ return resizebox(L, -1, newsize);
+}
+
+
+/*
+** check whether buffer is using a userdata on the stack as a temporary
+** buffer
+*/
+#define buffonstack(B) ((B)->b != (B)->initb)
+
+
+/*
+** returns a pointer to a free area with at least 'sz' bytes
+*/
+LUALIB_API char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz) {
+ lua_State *L = B->L;
+ if (B->size - B->n < sz) { /* not enough space? */
+ char *newbuff;
+ size_t newsize = B->size * 2; /* double buffer size */
+ if (newsize - B->n < sz) /* not big enough? */
+ newsize = B->n + sz;
+ if (newsize < B->n || newsize - B->n < sz)
+ luaL_error(L, "buffer too large");
+ /* create larger buffer */
+ if (buffonstack(B))
+ newbuff = (char *)resizebox(L, -1, newsize);
+ else { /* no buffer yet */
+ newbuff = (char *)newbox(L, newsize);
+ memcpy(newbuff, B->b, B->n * sizeof(char)); /* copy original content */
+ }
+ B->b = newbuff;
+ B->size = newsize;
+ }
+ return &B->b[B->n];
+}
+
+
+LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
+ if (l > 0) { /* avoid 'memcpy' when 's' can be NULL */
+ char *b = luaL_prepbuffsize(B, l);
+ memcpy(b, s, l * sizeof(char));
+ luaL_addsize(B, l);
+ }
+}
+
+
+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) {
+ lua_State *L = B->L;
+ lua_pushlstring(L, B->b, B->n);
+ if (buffonstack(B)) {
+ resizebox(L, -2, 0); /* delete old buffer */
+ lua_remove(L, -2); /* remove its header from the stack */
+ }
+}
+
+
+LUALIB_API void luaL_pushresultsize (luaL_Buffer *B, size_t sz) {
+ luaL_addsize(B, sz);
+ luaL_pushresult(B);
+}
+
+
+LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
+ lua_State *L = B->L;
+ size_t l;
+ const char *s = lua_tolstring(L, -1, &l);
+ if (buffonstack(B))
+ lua_insert(L, -2); /* put value below buffer */
+ luaL_addlstring(B, s, l);
+ lua_remove(L, (buffonstack(B)) ? -2 : -1); /* remove value */
+}
+
+
+LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
+ B->L = L;
+ B->b = B->initb;
+ B->n = 0;
+ B->size = LUAL_BUFFERSIZE;
+}
+
+
+LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {
+ luaL_buffinit(L, B);
+ return luaL_prepbuffsize(B, sz);
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Reference system
+** =======================================================
+*/
+
+/* index of free-list header */
+#define freelist 0
+
+
+LUALIB_API int luaL_ref (lua_State *L, int t) {
+ int ref;
+ if (lua_isnil(L, -1)) {
+ lua_pop(L, 1); /* remove from stack */
+ return LUA_REFNIL; /* 'nil' has a unique fixed reference */
+ }
+ t = lua_absindex(L, t);
+ lua_rawgeti(L, t, freelist); /* get first free element */
+ ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */
+ 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); /* (t[freelist] = t[ref]) */
+ }
+ else /* no free elements */
+ ref = (int)lua_rawlen(L, t) + 1; /* get a 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 = lua_absindex(L, t);
+ lua_rawgeti(L, t, freelist);
+ lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */
+ lua_pushinteger(L, ref);
+ lua_rawseti(L, t, freelist); /* t[freelist] = ref */
+ }
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Load functions
+** =======================================================
+*/
+
+typedef struct LoadF {
+ int n; /* number of pre-read characters */
+ FILE *f; /* file being read */
+ char buff[BUFSIZ]; /* area for reading file */
+} LoadF;
+
+
+static const char *getF (lua_State *L, void *ud, size_t *size) {
+ LoadF *lf = (LoadF *)ud;
+ (void)L; /* not used */
+ if (lf->n > 0) { /* are there pre-read characters to be read? */
+ *size = lf->n; /* return them (chars already in buffer) */
+ lf->n = 0; /* no more pre-read characters */
+ }
+ else { /* read a block from file */
+ /* 'fread' can return > 0 *and* set the EOF flag. If next call to
+ 'getF' called 'fread', it might still wait for user input.
+ The next check avoids this problem. */
+ if (feof(lf->f)) return NULL;
+ *size = fread(lf->buff, 1, sizeof(lf->buff), lf->f); /* read block */
+ }
+ return lf->buff;
+}
+
+
+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;
+}
+
+
+static int skipBOM (LoadF *lf) {
+ const char *p = "\xEF\xBB\xBF"; /* UTF-8 BOM mark */
+ int c;
+ lf->n = 0;
+ do {
+ c = getc(lf->f);
+ if (c == EOF || c != *(const unsigned char *)p++) return c;
+ lf->buff[lf->n++] = c; /* to be read by the parser */
+ } while (*p != '\0');
+ lf->n = 0; /* prefix matched; discard it */
+ return getc(lf->f); /* return next character */
+}
+
+
+/*
+** reads the first character of file 'f' and skips an optional BOM mark
+** in its beginning plus its first line if it starts with '#'. Returns
+** true if it skipped the first line. In any case, '*cp' has the
+** first "valid" character of the file (after the optional BOM and
+** a first-line comment).
+*/
+static int skipcomment (LoadF *lf, int *cp) {
+ int c = *cp = skipBOM(lf);
+ if (c == '#') { /* first line is a comment (Unix exec. file)? */
+ do { /* skip first line */
+ c = getc(lf->f);
+ } while (c != EOF && c != '\n');
+ *cp = getc(lf->f); /* skip end-of-line, if present */
+ return 1; /* there was a comment */
+ }
+ else return 0; /* no comment */
+}
+
+
+LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
+ const char *mode) {
+ LoadF lf;
+ int status, readstatus;
+ int c;
+ int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
+ if (filename == NULL) {
+ lua_pushliteral(L, "=stdin");
+ lf.f = stdin;
+ }
+ else {
+ lua_pushfstring(L, "@%s", filename);
+ lf.f = fopen(filename, "r");
+ if (lf.f == NULL) return errfile(L, "open", fnameindex);
+ }
+ if (skipcomment(&lf, &c)) /* read initial portion */
+ lf.buff[lf.n++] = '\n'; /* add line to correct line numbers */
+ if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */
+ lf.f = freopen(filename, "rb", lf.f); /* reopen in binary mode */
+ if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
+ skipcomment(&lf, &c); /* re-read initial portion */
+ }
+ if (c != EOF)
+ lf.buff[lf.n++] = c; /* 'c' is the first character of the stream */
+ status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode);
+ 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);
+ }
+ 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; /* not used */
+ if (ls->size == 0) return NULL;
+ *size = ls->size;
+ ls->size = 0;
+ return ls->s;
+}
+
+
+LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size,
+ const char *name, const char *mode) {
+ LoadS ls;
+ ls.s = buff;
+ ls.size = size;
+ return lua_load(L, getS, &ls, name, mode);
+}
+
+
+LUALIB_API int luaL_loadstring (lua_State *L, const char *s) {
+ return luaL_loadbuffer(L, s, strlen(s), s);
+}
+
+/* }====================================================== */
+
+
+
+LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
+ if (!lua_getmetatable(L, obj)) /* no metatable? */
+ return LUA_TNIL;
+ else {
+ int tt;
+ lua_pushstring(L, event);
+ tt = lua_rawget(L, -2);
+ if (tt == LUA_TNIL) /* is metafield nil? */
+ lua_pop(L, 2); /* remove metatable and metafield */
+ else
+ lua_remove(L, -2); /* remove only metatable */
+ return tt; /* return metafield type */
+ }
+}
+
+
+LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
+ obj = lua_absindex(L, obj);
+ if (luaL_getmetafield(L, obj, event) == LUA_TNIL) /* no metafield? */
+ return 0;
+ lua_pushvalue(L, obj);
+ lua_call(L, 1, 1);
+ return 1;
+}
+
+
+LUALIB_API lua_Integer luaL_len (lua_State *L, int idx) {
+ lua_Integer l;
+ int isnum;
+ lua_len(L, idx);
+ l = lua_tointegerx(L, -1, &isnum);
+ if (!isnum)
+ luaL_error(L, "object length is not an integer");
+ lua_pop(L, 1); /* remove object */
+ return l;
+}
+
+
+LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {
+ if (!luaL_callmeta(L, idx, "__tostring")) { /* no metafield? */
+ switch (lua_type(L, idx)) {
+ case LUA_TNUMBER: {
+ if (lua_isinteger(L, idx))
+ lua_pushfstring(L, "%I", lua_tointeger(L, idx));
+ else
+ lua_pushfstring(L, "%f", lua_tonumber(L, idx));
+ break;
+ }
+ case LUA_TSTRING:
+ lua_pushvalue(L, idx);
+ break;
+ case LUA_TBOOLEAN:
+ lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false"));
+ break;
+ case LUA_TNIL:
+ lua_pushliteral(L, "nil");
+ break;
+ default:
+ lua_pushfstring(L, "%s: %p", luaL_typename(L, idx),
+ lua_topointer(L, idx));
+ break;
+ }
+ }
+ return lua_tolstring(L, -1, len);
+}
+
+
+/*
+** {======================================================
+** Compatibility with 5.1 module functions
+** =======================================================
+*/
+#if defined(LUA_COMPAT_MODULE)
+
+static const char *luaL_findtable (lua_State *L, int idx,
+ const char *fname, int szhint) {
+ const char *e;
+ if (idx) lua_pushvalue(L, idx);
+ do {
+ e = strchr(fname, '.');
+ if (e == NULL) e = fname + strlen(fname);
+ lua_pushlstring(L, fname, e - fname);
+ if (lua_rawget(L, -2) == LUA_TNIL) { /* 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;
+}
+
+
+/*
+** Count number of elements in a luaL_Reg list.
+*/
+static int libsize (const luaL_Reg *l) {
+ int size = 0;
+ for (; l && l->name; l++) size++;
+ return size;
+}
+
+
+/*
+** Find or create a module table with a given name. The function
+** first looks at the _LOADED table and, if that fails, try a
+** global variable with that name. In any case, leaves on the stack
+** the module table.
+*/
+LUALIB_API void luaL_pushmodule (lua_State *L, const char *modname,
+ int sizehint) {
+ luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1); /* get _LOADED table */
+ if (lua_getfield(L, -1, modname) != LUA_TTABLE) { /* no _LOADED[modname]? */
+ lua_pop(L, 1); /* remove previous result */
+ /* try global variable (and create one if it does not exist) */
+ lua_pushglobaltable(L);
+ if (luaL_findtable(L, 0, modname, sizehint) != NULL)
+ luaL_error(L, "name conflict for module '%s'", modname);
+ lua_pushvalue(L, -1);
+ lua_setfield(L, -3, modname); /* _LOADED[modname] = new table */
+ }
+ lua_remove(L, -2); /* remove _LOADED table */
+}
+
+
+LUALIB_API void luaL_openlib (lua_State *L, const char *libname,
+ const luaL_Reg *l, int nup) {
+ luaL_checkversion(L);
+ if (libname) {
+ luaL_pushmodule(L, libname, libsize(l)); /* get/create library table */
+ lua_insert(L, -(nup + 1)); /* move library table to below upvalues */
+ }
+ if (l)
+ luaL_setfuncs(L, l, nup);
+ else
+ lua_pop(L, nup); /* remove upvalues */
+}
+
+#endif
+/* }====================================================== */
+
+/*
+** set functions from list 'l' into table at top - 'nup'; each
+** function gets the 'nup' elements at the top as upvalues.
+** Returns with only the table at the stack.
+*/
+LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
+ luaL_checkstack(L, nup, "too many upvalues");
+ for (; l->name != NULL; l++) { /* fill the table with given functions */
+ int i;
+ for (i = 0; i < nup; i++) /* copy upvalues to the top */
+ lua_pushvalue(L, -nup);
+ lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */
+ lua_setfield(L, -(nup + 2), l->name);
+ }
+ lua_pop(L, nup); /* remove upvalues */
+}
+
+
+/*
+** ensure that stack[idx][fname] has a table and push that table
+** into the stack
+*/
+LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) {
+ if (lua_getfield(L, idx, fname) == LUA_TTABLE)
+ return 1; /* table already there */
+ else {
+ lua_pop(L, 1); /* remove previous result */
+ idx = lua_absindex(L, idx);
+ lua_newtable(L);
+ lua_pushvalue(L, -1); /* copy to be left at top */
+ lua_setfield(L, idx, fname); /* assign new table to field */
+ return 0; /* false, because did not find table there */
+ }
+}
+
+
+/*
+** Stripped-down 'require': After checking "loaded" table, calls 'openf'
+** to open a module, registers the result in 'package.loaded' table and,
+** if 'glb' is true, also registers the result in the global table.
+** Leaves resulting module on the top.
+*/
+LUALIB_API void luaL_requiref (lua_State *L, const char *modname,
+ lua_CFunction openf, int glb) {
+ luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");
+ lua_getfield(L, -1, modname); /* _LOADED[modname] */
+ if (!lua_toboolean(L, -1)) { /* package not already loaded? */
+ lua_pop(L, 1); /* remove field */
+ lua_pushcfunction(L, openf);
+ lua_pushstring(L, modname); /* argument to open function */
+ lua_call(L, 1, 1); /* call 'openf' to open module */
+ lua_pushvalue(L, -1); /* make copy of module (call result) */
+ lua_setfield(L, -3, modname); /* _LOADED[modname] = module */
+ }
+ lua_remove(L, -2); /* remove _LOADED table */
+ if (glb) {
+ lua_pushvalue(L, -1); /* copy of module */
+ lua_setglobal(L, modname); /* _G[modname] = module */
+ }
+}
+
+
+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);
+}
+
+
+static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
+ (void)ud; (void)osize; /* not used */
+ if (nsize == 0) {
+ free(ptr);
+ return NULL;
+ }
+ else
+ return realloc(ptr, nsize);
+}
+
+
+static int panic (lua_State *L) {
+ lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",
+ lua_tostring(L, -1));
+ return 0; /* return to Lua to abort */
+}
+
+
+LUALIB_API lua_State *luaL_newstate (void) {
+ lua_State *L = lua_newstate(l_alloc, NULL);
+ if (L) lua_atpanic(L, &panic);
+ return L;
+}
+
+
+LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver, size_t sz) {
+ const lua_Number *v = lua_version(L);
+ if (sz != LUAL_NUMSIZES) /* check numeric types */
+ luaL_error(L, "core and library have incompatible numeric types");
+ if (v != lua_version(NULL))
+ luaL_error(L, "multiple Lua VMs detected");
+ else if (*v != ver)
+ luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f",
+ ver, *v);
+}
+
projects / ardour.git / blobdiff