mirror of https://github.com/lua/lua
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/*
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** $Id: lauxlib.c,v 1.25 2000/01/19 12:00:45 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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#define LUA_REENTRANT
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#include "lauxlib.h"
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#include "lua.h"
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#include "luadebug.h"
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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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void luaL_argerror (lua_State *L, int narg, const char *extramsg) {
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lua_Dbgactreg ar;
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lua_getstack(L, 0, &ar);
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lua_getinfo(L, "nu", &ar);
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narg -= ar.nups;
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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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static void type_error (lua_State *L, int narg, const char *type_name,
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lua_Object o) {
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char buff[100];
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const char *otype = (o == LUA_NOOBJECT) ? "no value" : lua_type(L, o);
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sprintf(buff, "%.10s expected, got %.10s", type_name, otype);
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luaL_argerror(L, narg, buff);
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}
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static const char *checkstr (lua_State *L, lua_Object o, int narg, long *len) {
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const char *s = lua_getstring(L, o);
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if (!s) type_error(L, narg, "string", o);
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if (len) *len = lua_strlen(L, o);
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return s;
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}
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const char *luaL_check_lstr (lua_State *L, int narg, long *len) {
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return checkstr(L, lua_getparam(L, narg), narg, len);
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}
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const char *luaL_opt_lstr (lua_State *L, int narg, const char *def, long *len) {
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lua_Object o = lua_getparam(L, narg);
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if (o == LUA_NOOBJECT) {
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if (len) *len = def ? strlen(def) : 0;
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return def;
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}
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else return checkstr(L, o, narg, len);
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}
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double luaL_check_number (lua_State *L, int narg) {
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lua_Object o = lua_getparam(L, narg);
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if (!lua_isnumber(L, o)) type_error(L, narg, "number", o);
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return lua_getnumber(L, o);
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}
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double luaL_opt_number (lua_State *L, int narg, double def) {
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lua_Object o = lua_getparam(L, narg);
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if (o == LUA_NOOBJECT) return def;
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else {
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if (!lua_isnumber(L, o)) type_error(L, narg, "number", o);
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return lua_getnumber(L, o);
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}
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}
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lua_Object luaL_tablearg (lua_State *L, int narg) {
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lua_Object o = lua_getparam(L, narg);
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if (!lua_istable(L, o)) type_error(L, narg, "table", o);
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return o;
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}
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lua_Object luaL_functionarg (lua_State *L, int narg) {
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lua_Object o = lua_getparam(L, narg);
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if (!lua_isfunction(L, o)) type_error(L, narg, "function", o);
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return o;
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}
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lua_Object luaL_nonnullarg (lua_State *L, int narg) {
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lua_Object o = lua_getparam(L, narg);
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luaL_arg_check(L, o != LUA_NOOBJECT, narg, "value expected");
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return o;
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}
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void luaL_openlib (lua_State *L, const struct luaL_reg *l, int n) {
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int i;
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for (i=0; i<n; i++)
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lua_register(L, l[i].name, l[i].func);
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}
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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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#define EXTRALEN sizeof("string \"...\"0")
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void luaL_chunkid (char *out, const char *source, int len) {
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if (*source == '(') {
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strncpy(out, source+1, len-1); /* remove first char */
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out[len-1] = '\0'; /* make sure `out' has an end */
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out[strlen(out)-1] = '\0'; /* remove last char */
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}
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else {
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len -= EXTRALEN;
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if (*source == '@')
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sprintf(out, "file `%.*s'", len, source+1);
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else {
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const char *b = strchr(source , '\n'); /* stop at first new line */
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int lim = (b && (b-source)<len) ? b-source : len;
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sprintf(out, "string \"%.*s\"", lim, source);
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strcpy(out+lim+(EXTRALEN-sizeof("...\"0")), "...\"");
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}
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}
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}
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void luaL_filesource (char *out, const char *filename, int len) {
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if (filename == NULL) filename = "(stdin)";
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sprintf(out, "@%.*s", len-2, filename); /* -2 for '@' and '\0' */
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}
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