mirror of https://github.com/lua/lua
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
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** $Id: lobject.c,v 1.63 2001/01/29 19:34:02 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 "ldo.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 TObject luaO_nilobject = {LUA_TNIL, {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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luint32 luaO_power2 (luint32 n) {
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luint32 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 LUA_TNUMBER:
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return nvalue(t1) == nvalue(t2);
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case LUA_TNIL:
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return 1;
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default: /* all other types are equal if pointers are equal */
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return tsvalue(t1) == tsvalue(t2);
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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 > G(L)->Mbuffsize) {
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luaM_reallocvector(L, G(L)->Mbuffer, G(L)->Mbuffsize, n, char);
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G(L)->Mbuffsize = n;
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}
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return G(L)->Mbuffer;
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}
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int luaO_str2d (const char *s, lua_Number *result) { /* LUA_NUMBER */
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char *endptr;
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lua_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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/* maximum length of a string format for `luaO_verror' */
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#define MAX_VERROR 280
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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[MAX_VERROR]; /* to hold formatted 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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luaD_error(L, buff);
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}
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void luaO_chunkid (char *out, const char *source, int bufflen) {
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if (*source == '=') {
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strncpy(out, source+1, bufflen); /* remove first char */
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out[bufflen-1] = '\0'; /* ensures null termination */
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}
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else {
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if (*source == '@') {
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int l;
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source++; /* skip the `@' */
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bufflen -= sizeof("file `...%s'");
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l = strlen(source);
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if (l>bufflen) {
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source += (l-bufflen); /* get last part of file name */
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sprintf(out, "file `...%.99s'", source);
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}
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else
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sprintf(out, "file `%.99s'", source);
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}
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else {
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int len = strcspn(source, "\n"); /* stop at first newline */
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bufflen -= sizeof("string \"%.*s...\"");
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if (len > bufflen) len = bufflen;
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if (source[len] != '\0') { /* must truncate? */
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strcpy(out, "string \"");
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out += strlen(out);
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strncpy(out, source, len);
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strcpy(out+len, "...\"");
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}
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else
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sprintf(out, "string \"%.99s\"", source);
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}
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}
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}
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