lauxlib.c
(5.0.3)
/*
** $Id: lauxlib.c,v 1.100 2003/04/07 14:35:00 roberto Exp $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
/* This file uses only the official API of Lua.
** Any function declared here could be written as an application function.
*/
#define lauxlib_c
#include "lua.h"
#include "lauxlib.h"
/* number of prereserved references (for internal use) */
#define RESERVED_REFS 2
/* reserved references */
#define FREELIST_REF 1 /* free list of references */
#define ARRAYSIZE_REF 2 /* array sizes */
/* convert a stack index to positive */
#define abs_index(L, i) ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
lua_gettop(L) + (i) + 1)
/*
** {======================================================
** Error-report functions
** =======================================================
*/
LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
lua_Debug ar;
lua_getstack(L, 0, &ar);
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 `%s' on bad self (%s)", ar.name, extramsg);
}
if (ar.name == NULL)
ar.name = "?";
return luaL_error(L, "bad argument #%d to `%s' (%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, lua_type(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, "Snl", &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_findstring (const char *name, const char *const list[]) {
int i;
for (i=0; list[i]; i++)
if (strcmp(list[i], name) == 0)
return i;
return -1; /* name not found */
}
LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
lua_pushstring(L, tname);
lua_rawget(L, LUA_REGISTRYINDEX); /* 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_pushstring(L, tname);
lua_pushvalue(L, -2);
lua_rawset(L, LUA_REGISTRYINDEX); /* registry.name = metatable */
lua_pushvalue(L, -1);
lua_pushstring(L, tname);
lua_rawset(L, LUA_REGISTRYINDEX); /* registry[metatable] = name */
return 1;
}
LUALIB_API void luaL_getmetatable (lua_State *L, const char *tname) {
lua_pushstring(L, tname);
lua_rawget(L, LUA_REGISTRYINDEX);
}
LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
const char *tn;
if (!lua_getmetatable(L, ud)) return NULL; /* no metatable? */
lua_rawget(L, LUA_REGISTRYINDEX); /* get registry[metatable] */
tn = lua_tostring(L, -1);
if (tn && (strcmp(tn, tname) == 0)) {
lua_pop(L, 1);
return lua_touserdata(L, ud);
}
else {
lua_pop(L, 1);
return NULL;
}
}
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_tostring(L, narg);
if (!s) tag_error(L, narg, LUA_TSTRING);
if (len) *len = lua_strlen(L, narg);
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) {
if (lua_isnoneornil(L, narg)) return def;
else return luaL_checknumber(L, narg);
}
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_openlib (lua_State *L, const char *libname,
const luaL_reg *l, int nup) {
if (libname) {
lua_pushstring(L, libname);
lua_gettable(L, LUA_GLOBALSINDEX); /* check whether lib already exists */
if (lua_isnil(L, -1)) { /* no? */
lua_pop(L, 1);
lua_newtable(L); /* create it */
lua_pushstring(L, libname);
lua_pushvalue(L, -2);
lua_settable(L, LUA_GLOBALSINDEX); /* register it with given name */
}
lua_insert(L, -(nup+1)); /* move library table to below upvalues */
}
for (; l->name; l++) {
int i;
lua_pushstring(L, l->name);
for (i=0; i<nup; i++) /* copy upvalues to the top */
lua_pushvalue(L, -(nup+1));
lua_pushcclosure(L, l->func, nup);
lua_settable(L, -(nup+3));
}
lua_pop(L, nup); /* remove upvalues */
}
/*
** {======================================================
** getn-setn: size for arrays
** =======================================================
*/
static int checkint (lua_State *L, int topop) {
int n = (int)lua_tonumber(L, -1);
if (n == 0 && !lua_isnumber(L, -1)) n = -1;
lua_pop(L, topop);
return n;
}
static void getsizes (lua_State *L) {
lua_rawgeti(L, LUA_REGISTRYINDEX, ARRAYSIZE_REF);
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, "__mode");
lua_pushliteral(L, "k");
lua_rawset(L, -3); /* metatable(N).__mode = "k" */
lua_pushvalue(L, -1);
lua_rawseti(L, LUA_REGISTRYINDEX, ARRAYSIZE_REF); /* store in register */
}
}
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_pushnumber(L, (lua_Number)n);
lua_rawset(L, t);
}
else { /* use `sizes' */
getsizes(L);
lua_pushvalue(L, t);
lua_pushnumber(L, (lua_Number)n);
lua_rawset(L, -3); /* sizes[t] = n */
lua_pop(L, 1); /* remove `sizes' */
}
}
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;
for (n = 1; ; n++) { /* else must count elements */
lua_rawgeti(L, t, n);
if (lua_isnil(L, -1)) break;
lua_pop(L, 1);
}
lua_pop(L, 1);
return n - 1;
}
/* }====================================================== */
/*
** {======================================================
** 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_putchar(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 = lua_strlen(L, -1);
if (vl <= bufffree(B)) { /* fit into buffer? */
memcpy(B->p, lua_tostring(L, -1), 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_tonumber(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 = luaL_getn(L, t);
if (ref < RESERVED_REFS)
ref = RESERVED_REFS; /* skip reserved references */
ref++; /* create new reference */
luaL_setn(L, t, ref);
}
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_pushnumber(L, (lua_Number)ref);
lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */
}
}
/*
** {======================================================
** Load functions
** =======================================================
*/
typedef struct LoadF {
FILE *f;
char buff[LUAL_BUFFERSIZE];
} LoadF;
static const char *getF (lua_State *L, void *ud, size_t *size) {
LoadF *lf = (LoadF *)ud;
(void)L;
if (feof(lf->f)) return NULL;
*size = fread(lf->buff, 1, LUAL_BUFFERSIZE, lf->f);
return (*size > 0) ? lf->buff : NULL;
}
static int errfile (lua_State *L, int fnameindex) {
const char *filename = lua_tostring(L, fnameindex) + 1;
lua_pushfstring(L, "cannot read %s: %s", filename, strerror(errno));
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 */
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, fnameindex); /* unable to open file */
c = ungetc(getc(lf.f), lf.f);
if (!(isspace(c) || isprint(c)) && lf.f != stdin) { /* binary file? */
fclose(lf.f);
lf.f = fopen(filename, "rb"); /* reopen in binary mode */
if (lf.f == NULL) return errfile(L, fnameindex); /* unable to reopen file */
}
status = lua_load(L, getF, &lf, lua_tostring(L, -1));
readstatus = ferror(lf.f);
if (lf.f != stdin) fclose(lf.f); /* close file (even in case of errors) */
if (readstatus) {
lua_settop(L, fnameindex); /* ignore results from `lua_load' */
return errfile(L, 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;
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);
}
/* }====================================================== */
/*
** {======================================================
** compatibility code
** =======================================================
*/
static void callalert (lua_State *L, int status) {
if (status != 0) {
lua_getglobal(L, "_ALERT");
if (lua_isfunction(L, -1)) {
lua_insert(L, -2);
lua_call(L, 1, 0);
}
else { /* no _ALERT function; print it on stderr */
fprintf(stderr, "%s\n", lua_tostring(L, -2));
lua_pop(L, 2); /* remove error message and _ALERT */
}
}
}
static int aux_do (lua_State *L, int status) {
if (status == 0) { /* parse OK? */
status = lua_pcall(L, 0, LUA_MULTRET, 0); /* call main */
}
callalert(L, status);
return status;
}
LUALIB_API int lua_dofile (lua_State *L, const char *filename) {
return aux_do(L, luaL_loadfile(L, filename));
}
LUALIB_API int lua_dobuffer (lua_State *L, const char *buff, size_t size,
const char *name) {
return aux_do(L, luaL_loadbuffer(L, buff, size, name));
}
LUALIB_API int lua_dostring (lua_State *L, const char *str) {
return lua_dobuffer(L, str, strlen(str), str);
}
/* }====================================================== */