mirror of https://github.com/lua/lua
142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/*
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** $Id: lauxlib.c,v 1.21 1999/11/22 13:12:07 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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/* Please Notice: 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 numarg, const char *extramsg) {
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lua_Function f = lua_stackedfunction(L, 0);
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const char *funcname;
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lua_getobjname(L, f, &funcname);
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numarg -= lua_nups(L, f);
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if (funcname == NULL)
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funcname = "?";
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luaL_verror(L, "bad argument #%d to function `%.50s' (%.100s)",
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numarg, funcname, extramsg);
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}
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static const char *checkstr (lua_State *L, lua_Object o, int n, long *len) {
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const char *s = lua_getstring(L, o);
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luaL_arg_check(L, s, n, "string expected");
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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 n, long *len) {
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return checkstr(L, lua_getparam(L, n), n, len);
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}
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const char *luaL_opt_lstr (lua_State *L, int n, const char *def, long *len) {
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lua_Object o = lua_getparam(L, n);
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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, n, len);
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}
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double luaL_check_number (lua_State *L, int n) {
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lua_Object o = lua_getparam(L, n);
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luaL_arg_check(L, lua_isnumber(L, o), n, "number expected");
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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 n, double def) {
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lua_Object o = lua_getparam(L, n);
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if (o == LUA_NOOBJECT) return def;
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else {
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luaL_arg_check(L, lua_isnumber(L, o), n, "number expected");
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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 arg) {
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lua_Object o = lua_getparam(L, arg);
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luaL_arg_check(L, lua_istable(L, o), arg, "table expected");
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return o;
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}
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lua_Object luaL_functionarg (lua_State *L, int arg) {
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lua_Object o = lua_getparam(L, arg);
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luaL_arg_check(L, lua_isfunction(L, o), arg, "function expected");
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return o;
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}
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lua_Object luaL_nonnullarg (lua_State *L, int n) {
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lua_Object o = lua_getparam(L, n);
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luaL_arg_check(L, o != LUA_NOOBJECT, n, "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 13 /* > strlen('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-5), "...\""); /* 5 = strlen("...'\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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