mirror of
https://github.com/lua/lua.git
synced 2024-11-30 21:53:26 +08:00
294 lines
6.9 KiB
C
294 lines
6.9 KiB
C
/*
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** $Id: lauxlib.c,v 1.64 2002/04/02 20:42:49 roberto Exp roberto $
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** Auxiliary functions for building Lua libraries
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** See Copyright Notice in lua.h
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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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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** With care, these functions can be used by other libraries.
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*/
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#include "lua.h"
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#include "lauxlib.h"
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#include "luadebug.h"
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#include "lualib.h"
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LUALIB_API const char *luaL_errstr (int errcode) {
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static const char *const errstr[] = {
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"ok",
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"run-time error",
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"cannot open file",
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"syntax error",
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"not enough memory",
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"error in error handling"
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};
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return errstr[errcode];
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}
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LUALIB_API int luaL_findstring (const char *name, const char *const list[]) {
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int i;
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for (i=0; list[i]; i++)
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if (strcmp(list[i], name) == 0)
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return i;
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return -1; /* name not found */
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}
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LUALIB_API void 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);
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lua_getinfo(L, "n", &ar);
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if (strcmp(ar.namewhat, "method") == 0) narg--; /* do not count `self' */
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if (ar.name == NULL)
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ar.name = "?";
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luaL_verror(L, "bad argument #%d to `%.50s' (%.100s)",
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narg, ar.name, extramsg);
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}
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LUALIB_API void luaL_typerror (lua_State *L, int narg, const char *tname) {
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char buff[80];
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sprintf(buff, "%.25s expected, got %.25s", tname,
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lua_typename(L, lua_type(L,narg)));
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luaL_argerror(L, narg, buff);
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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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}
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LUALIB_API void luaL_check_stack (lua_State *L, int space, const char *mes) {
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if (!lua_checkstack(L, space))
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luaL_verror(L, "stack overflow (%.30s)", mes);
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}
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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);
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}
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LUALIB_API void luaL_check_any (lua_State *L, int narg) {
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if (lua_type(L, narg) == LUA_TNONE)
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luaL_argerror(L, narg, "value expected");
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}
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LUALIB_API const char *luaL_check_lstr (lua_State *L, int narg, size_t *len) {
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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;
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}
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LUALIB_API const char *luaL_opt_lstr (lua_State *L, int narg, const char *def, size_t *len) {
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if (lua_isnoneornil(L, narg)) {
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if (len)
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*len = (def ? strlen(def) : 0);
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return def;
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}
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else return luaL_check_lstr(L, narg, len);
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}
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LUALIB_API lua_Number luaL_check_number (lua_State *L, int narg) {
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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;
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}
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LUALIB_API lua_Number luaL_opt_number (lua_State *L, int narg, lua_Number def) {
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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) {
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if (!lua_getmetatable(L, obj)) /* no metatable? */
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return 0;
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lua_pushstring(L, event);
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lua_rawget(L, -2);
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if (lua_isnil(L, -1)) {
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lua_pop(L, 2); /* remove metatable and metafield */
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return 0;
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}
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lua_pushvalue(L, obj);
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lua_rawcall(L, 1, 1);
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return 1;
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}
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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 */
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lua_pushvalue(L, -(nup+1));
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lua_pushcclosure(L, l->func, nup);
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lua_settable(L, -(nup+3));
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}
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lua_pop(L, nup);
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}
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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));
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luaL_openlib(L, l, nup);
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lua_settable(L, LUA_GLOBALSINDEX);
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}
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LUALIB_API void luaL_verror (lua_State *L, const char *fmt, ...) {
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char buff[500];
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va_list argp;
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va_start(argp, fmt);
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vsprintf(buff, fmt, argp);
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va_end(argp);
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lua_error(L, buff);
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}
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/*
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** {======================================================
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** Generic Buffer manipulation
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** =======================================================
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*/
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#define buffempty(B) ((B)->p == (B)->buffer)
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#define bufflen(B) ((B)->p - (B)->buffer)
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#define bufffree(B) ((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
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#define LIMIT (LUA_MINSTACK/2)
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static int emptybuffer (luaL_Buffer *B) {
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size_t l = bufflen(B);
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if (l == 0) return 0; /* put nothing on stack */
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else {
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lua_pushlstring(B->L, B->buffer, l);
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B->p = B->buffer;
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B->level++;
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return 1;
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}
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}
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static void adjuststack (luaL_Buffer *B) {
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if (B->level > 1) {
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lua_State *L = B->L;
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int toget = 1; /* number of levels to concat */
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size_t toplen = lua_strlen(L, -1);
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do {
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size_t l = lua_strlen(L, -(toget+1));
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if (B->level - toget + 1 >= LIMIT || toplen > l) {
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toplen += l;
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toget++;
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}
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else break;
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} while (toget < B->level);
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lua_concat(L, toget);
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B->level = B->level - toget + 1;
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}
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}
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LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
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if (emptybuffer(B))
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adjuststack(B);
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return B->buffer;
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}
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LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
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while (l--)
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luaL_putchar(B, *s++);
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}
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LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
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luaL_addlstring(B, s, strlen(s));
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}
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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;
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}
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LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
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lua_State *L = B->L;
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size_t vl = lua_strlen(L, -1);
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if (vl <= bufffree(B)) { /* fit into buffer? */
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memcpy(B->p, lua_tostring(L, -1), vl); /* put it there */
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B->p += vl;
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lua_pop(L, 1); /* remove from stack */
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}
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else {
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if (emptybuffer(B))
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lua_insert(L, -2); /* put buffer before new value */
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B->level++; /* add new value into B stack */
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adjuststack(B);
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}
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}
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LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
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B->L = L;
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B->p = B->buffer;
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B->level = 0;
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}
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/* }====================================================== */
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LUALIB_API int luaL_ref (lua_State *L, int t) {
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int ref;
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lua_rawgeti(L, t, 0); /* get first free element */
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ref = (int)lua_tonumber(L, -1);
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lua_pop(L, 1); /* remove it from stack */
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if (ref != 0) { /* any free element? */
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lua_rawgeti(L, t, ref); /* remove it from list */
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lua_rawseti(L, t, 0);
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}
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else { /* no free elements */
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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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}
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lua_rawseti(L, t, ref);
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return ref;
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}
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LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
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if (ref >= 0) {
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lua_rawgeti(L, t, 0);
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lua_pushnumber(L, ref);
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lua_rawseti(L, t, 0);
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lua_rawseti(L, t, ref);
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}
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}
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