lua/lauxlib.c

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/*
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** $Id: lauxlib.c,v 1.72 2002/06/03 20:11:41 roberto Exp roberto $
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** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#ifndef lua_filerror
#include <errno.h>
#define lua_fileerror (strerror(errno))
#endif
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/* This file uses only the official API of Lua.
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** Any function declared here could be written as an application function.
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*/
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#include "lua.h"
#include "lauxlib.h"
#include "luadebug.h"
/*
** {======================================================
** Error-report functions
** =======================================================
*/
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LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
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lua_Debug ar;
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lua_getstack(L, 0, &ar);
lua_getinfo(L, "n", &ar);
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if (strcmp(ar.namewhat, "method") == 0) {
narg--; /* do not count `self' */
if (narg == 0) /* error is in the self argument itself? */
return luaL_verror(L,
"calling %s on bad self (perhaps using `:' instead of `.')",
ar.name);
}
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if (ar.name == NULL)
ar.name = "?";
return luaL_verror(L, "bad argument #%d to `%s' (%s)",
narg, ar.name, extramsg);
}
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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);
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}
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static void tag_error (lua_State *L, int narg, int tag) {
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luaL_typerror(L, narg, lua_typename(L, tag));
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}
LUALIB_API int luaL_verror (lua_State *L, const char *fmt, ...) {
lua_Debug ar;
const char *msg;
va_list argp;
va_start(argp, fmt);
msg = lua_pushvfstring(L, fmt, argp);
va_end(argp);
if (lua_getstack(L, 1, &ar)) { /* check calling function */
lua_getinfo(L, "Snl", &ar);
if (ar.currentline > 0)
lua_pushfstring(L, "%s:%d: %s", ar.short_src, ar.currentline, msg);
}
return lua_errorobj(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 void luaL_check_stack (lua_State *L, int space, const char *mes) {
if (!lua_checkstack(L, space))
luaL_verror(L, "stack overflow (%s)", mes);
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}
LUALIB_API void luaL_check_type (lua_State *L, int narg, int t) {
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if (lua_type(L, narg) != t)
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tag_error(L, narg, t);
}
LUALIB_API void luaL_check_any (lua_State *L, int narg) {
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if (lua_type(L, narg) == LUA_TNONE)
luaL_argerror(L, narg, "value expected");
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}
LUALIB_API const char *luaL_check_lstr (lua_State *L, int narg, size_t *len) {
const char *s = lua_tostring(L, narg);
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if (!s) tag_error(L, narg, LUA_TSTRING);
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if (len) *len = lua_strlen(L, narg);
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return s;
}
LUALIB_API const char *luaL_opt_lstr (lua_State *L, int narg, const char *def, size_t *len) {
if (lua_isnoneornil(L, narg)) {
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if (len)
*len = (def ? strlen(def) : 0);
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return def;
}
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else return luaL_check_lstr(L, narg, len);
}
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LUALIB_API lua_Number luaL_check_number (lua_State *L, int narg) {
lua_Number d = lua_tonumber(L, narg);
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if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
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tag_error(L, narg, LUA_TNUMBER);
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return d;
}
LUALIB_API lua_Number luaL_opt_number (lua_State *L, int narg, lua_Number def) {
if (lua_isnoneornil(L, narg)) return def;
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else return luaL_check_number(L, narg);
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}
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LUALIB_API int luaL_callmeta (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;
}
lua_pushvalue(L, obj);
lua_rawcall(L, 1, 1);
return 1;
}
LUALIB_API void luaL_openlib (lua_State *L, const luaL_reg *l, int nup) {
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for (; l->name; l++) {
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int i;
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lua_pushstring(L, l->name);
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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));
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}
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lua_pop(L, nup);
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}
LUALIB_API void luaL_opennamedlib (lua_State *L, const char *libname,
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const luaL_reg *l, int nup) {
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lua_pushstring(L, libname);
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lua_insert(L, -(nup+1));
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lua_newtable(L);
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lua_insert(L, -(nup+1));
luaL_openlib(L, l, nup);
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lua_settable(L, LUA_GLOBALSINDEX);
}
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/*
** {======================================================
** Generic Buffer manipulation
** =======================================================
*/
#define buffempty(B) ((B)->p == (B)->buffer)
#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->level++;
return 1;
}
}
static void adjuststack (luaL_Buffer *B) {
if (B->level > 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->level - toget + 1 >= LIMIT || toplen > l) {
toplen += l;
toget++;
}
else break;
} while (toget < B->level);
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lua_concat(L, toget);
B->level = B->level - toget + 1;
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}
}
LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
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if (emptybuffer(B))
adjuststack(B);
return B->buffer;
}
LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
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while (l--)
luaL_putchar(B, *s++);
}
LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
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luaL_addlstring(B, s, strlen(s));
}
LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
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emptybuffer(B);
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lua_concat(B->L, B->level);
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B->level = 1;
}
LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
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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->level++; /* add new value into B stack */
adjuststack(B);
}
}
LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
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B->L = L;
B->p = B->buffer;
B->level = 0;
}
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/* }====================================================== */
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LUALIB_API int luaL_ref (lua_State *L, int t) {
int ref;
lua_rawgeti(L, t, 0); /* get first free element */
ref = (int)lua_tonumber(L, -1);
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, 0);
}
else { /* no free elements */
ref = lua_getn(L, t) + 1; /* use next `n' */
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lua_pushliteral(L, "n");
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lua_pushnumber(L, ref);
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lua_rawset(L, t); /* n = n+1 */
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}
lua_rawseti(L, t, ref);
return ref;
}
LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
if (ref >= 0) {
lua_rawgeti(L, t, 0);
lua_pushnumber(L, ref);
lua_rawseti(L, t, 0);
lua_rawseti(L, t, ref);
}
}
/*
** {======================================================
** Load functions
** =======================================================
*/
typedef struct LoadF {
FILE *f;
char buff[LUAL_BUFFERSIZE];
} LoadF;
static const char *getF (void *ud, size_t *size) {
LoadF *lf = (LoadF *)ud;
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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, const char *filename) {
if (filename == NULL) filename = "stdin";
lua_pushfstring(L, "cannot read %s: %s", filename, lua_fileerror);
return LUA_ERRFILE;
}
LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
LoadF lf;
int status;
int c;
int old_top = lua_gettop(L);
lf.f = (filename == NULL) ? stdin : fopen(filename, "r");
if (lf.f == NULL) return errfile(L, filename); /* 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, filename); /* unable to reopen file */
}
if (filename == NULL)
lua_pushliteral(L, "=stdin");
else
lua_pushfstring(L, "@%s", filename);
status = lua_load(L, getF, &lf, lua_tostring(L, -1));
lua_remove(L, old_top+1); /* remove filename from stack */
if (ferror(lf.f)) {
lua_settop(L, old_top); /* ignore results from `lua_load' */
return errfile(L, filename);
}
if (lf.f != stdin)
fclose(lf.f);
return status;
}
typedef struct LoadS {
const char *s;
size_t size;
} LoadS;
static const char *getS (void *ud, size_t *size) {
LoadS *ls = (LoadS *)ud;
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) {
int top = lua_gettop(L);
lua_getglobal(L, "_ALERT");
lua_insert(L, -2);
lua_pcall(L, 1, 0, 0);
lua_settop(L, top-1);
}
}
LUALIB_API int lua_call (lua_State *L, int nargs, int nresults) {
int status;
int errpos = lua_gettop(L) - nargs;
lua_getglobal(L, "_ERRORMESSAGE");
lua_insert(L, errpos); /* put below function and args */
status = lua_pcall(L, nargs, nresults, errpos);
lua_remove(L, errpos);
callalert(L, status);
return status;
}
static int aux_do (lua_State *L, int status) {
if (status == 0) { /* parse OK? */
int err = lua_gettop(L);
lua_getglobal(L, "_ERRORMESSAGE");
lua_insert(L, err);
status = lua_pcall(L, 0, LUA_MULTRET, err); /* call main */
lua_remove(L, err); /* remove error function */
}
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);
}
/* }====================================================== */