mirror of https://github.com/lua/lua
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
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** $Id: lobject.c,v 1.50 2000/10/02 20:10:55 roberto Exp roberto $
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** Some generic functions over Lua objects
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** See Copyright Notice in lua.h
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*/
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lua.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstate.h"
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const lua_Type luaO_typearr[] = { /* ORDER LUA_T */
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LUA_TUSERDATA, LUA_TNUMBER, LUA_TSTRING, LUA_TTABLE,
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LUA_TFUNCTION, LUA_TFUNCTION, LUA_TNIL
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};
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const TObject luaO_nilobject = {TAG_NIL, {NULL}};
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/*
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** returns smaller power of 2 larger than `n' (minimum is MINPOWER2)
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*/
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lint32 luaO_power2 (lint32 n) {
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lint32 p = MINPOWER2;
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while (p<=n) p<<=1;
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return p;
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}
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int luaO_equalObj (const TObject *t1, const TObject *t2) {
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if (ttype(t1) != ttype(t2)) return 0;
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switch (ttype(t1)) {
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case TAG_NUMBER:
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return nvalue(t1) == nvalue(t2);
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case TAG_STRING: case TAG_USERDATA:
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return tsvalue(t1) == tsvalue(t2);
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case TAG_TABLE:
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return hvalue(t1) == hvalue(t2);
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case TAG_CCLOSURE: case TAG_LCLOSURE:
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return clvalue(t1) == clvalue(t2);
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default:
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LUA_ASSERT(ttype(t1) == TAG_NIL, "invalid type");
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return 1; /* TAG_NIL */
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}
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}
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char *luaO_openspace (lua_State *L, size_t n) {
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if (n > L->Mbuffsize) {
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luaM_reallocvector(L, L->Mbuffer, n, char);
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L->nblocks += (n - L->Mbuffsize)*sizeof(char);
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L->Mbuffsize = n;
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}
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return L->Mbuffer;
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}
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int luaO_str2d (const char *s, Number *result) { /* LUA_NUMBER */
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char *endptr;
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Number res = lua_str2number(s, &endptr);
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if (endptr == s) return 0; /* no conversion */
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while (isspace((unsigned char)*endptr)) endptr++;
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if (*endptr != '\0') return 0; /* invalid trailing characters? */
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*result = res;
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return 1;
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}
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/* this function needs to handle only '%d' and '%.XXs' formats */
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void luaO_verror (lua_State *L, const char *fmt, ...) {
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va_list argp;
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char buff[600]; /* to hold formated message */
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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 luaO_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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