rlm@1: /*
rlm@1: ** $Id: lobject.c,v 2.22.1.1 2007/12/27 13:02:25 roberto Exp $
rlm@1: ** Some generic functions over Lua objects
rlm@1: ** See Copyright Notice in lua.h
rlm@1: */
rlm@1: 
rlm@1: #include <ctype.h>
rlm@1: #include <stdarg.h>
rlm@1: #include <stdio.h>
rlm@1: #include <stdlib.h>
rlm@1: #include <string.h>
rlm@1: 
rlm@1: #define lobject_c
rlm@1: #define LUA_CORE
rlm@1: 
rlm@1: #include "lua.h"
rlm@1: 
rlm@1: #include "ldo.h"
rlm@1: #include "lmem.h"
rlm@1: #include "lobject.h"
rlm@1: #include "lstate.h"
rlm@1: #include "lstring.h"
rlm@1: #include "lvm.h"
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: const TValue luaO_nilobject_ = {{NULL}, LUA_TNIL};
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** converts an integer to a "floating point byte", represented as
rlm@1: ** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
rlm@1: ** eeeee != 0 and (xxx) otherwise.
rlm@1: */
rlm@1: int luaO_int2fb (unsigned int x) {
rlm@1:   int e = 0;  /* expoent */
rlm@1:   while (x >= 16) {
rlm@1:     x = (x+1) >> 1;
rlm@1:     e++;
rlm@1:   }
rlm@1:   if (x < 8) return x;
rlm@1:   else return ((e+1) << 3) | (cast_int(x) - 8);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: /* converts back */
rlm@1: int luaO_fb2int (int x) {
rlm@1:   int e = (x >> 3) & 31;
rlm@1:   if (e == 0) return x;
rlm@1:   else return ((x & 7)+8) << (e - 1);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: int luaO_log2 (unsigned int x) {
rlm@1:   static const lu_byte log_2[256] = {
rlm@1:     0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
rlm@1:     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
rlm@1:     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
rlm@1:     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
rlm@1:     8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
rlm@1:     8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
rlm@1:     8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
rlm@1:     8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
rlm@1:   };
rlm@1:   int l = -1;
rlm@1:   while (x >= 256) { l += 8; x >>= 8; }
rlm@1:   return l + log_2[x];
rlm@1: 
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: int luaO_rawequalObj (const TValue *t1, const TValue *t2) {
rlm@1:   if (ttype(t1) != ttype(t2)) return 0;
rlm@1:   else switch (ttype(t1)) {
rlm@1:     case LUA_TNIL:
rlm@1:       return 1;
rlm@1:     case LUA_TNUMBER:
rlm@1:       return luai_numeq(nvalue(t1), nvalue(t2));
rlm@1:     case LUA_TBOOLEAN:
rlm@1:       return bvalue(t1) == bvalue(t2);  /* boolean true must be 1 !! */
rlm@1:     case LUA_TLIGHTUSERDATA:
rlm@1:       return pvalue(t1) == pvalue(t2);
rlm@1:     default:
rlm@1:       lua_assert(iscollectable(t1));
rlm@1:       return gcvalue(t1) == gcvalue(t2);
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: int luaO_str2d (const char *s, lua_Number *result) {
rlm@1:   char *endptr;
rlm@1:   *result = lua_str2number(s, &endptr);
rlm@1:   if (endptr == s) return 0;  /* conversion failed */
rlm@1:   if (*endptr == 'x' || *endptr == 'X')  /* maybe an hexadecimal constant? */
rlm@1:     *result = cast_num(strtoul(s, &endptr, 16));
rlm@1:   if (*endptr == '\0') return 1;  /* most common case */
rlm@1:   while (isspace(cast(unsigned char, *endptr))) endptr++;
rlm@1:   if (*endptr != '\0') return 0;  /* invalid trailing characters? */
rlm@1:   return 1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: static void pushstr (lua_State *L, const char *str) {
rlm@1:   setsvalue2s(L, L->top, luaS_new(L, str));
rlm@1:   incr_top(L);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: /* this function handles only `%d', `%c', %f, %p, and `%s' formats */
rlm@1: const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
rlm@1:   int n = 1;
rlm@1:   pushstr(L, "");
rlm@1:   for (;;) {
rlm@1:     const char *e = strchr(fmt, '%');
rlm@1:     if (e == NULL) break;
rlm@1:     setsvalue2s(L, L->top, luaS_newlstr(L, fmt, e-fmt));
rlm@1:     incr_top(L);
rlm@1:     switch (*(e+1)) {
rlm@1:       case 's': {
rlm@1:         const char *s = va_arg(argp, char *);
rlm@1:         if (s == NULL) s = "(null)";
rlm@1:         pushstr(L, s);
rlm@1:         break;
rlm@1:       }
rlm@1:       case 'c': {
rlm@1:         char buff[2];
rlm@1:         buff[0] = cast(char, va_arg(argp, int));
rlm@1:         buff[1] = '\0';
rlm@1:         pushstr(L, buff);
rlm@1:         break;
rlm@1:       }
rlm@1:       case 'd': {
rlm@1:         setnvalue(L->top, cast_num(va_arg(argp, int)));
rlm@1:         incr_top(L);
rlm@1:         break;
rlm@1:       }
rlm@1:       case 'f': {
rlm@1:         setnvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
rlm@1:         incr_top(L);
rlm@1:         break;
rlm@1:       }
rlm@1:       case 'p': {
rlm@1:         char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
rlm@1:         sprintf(buff, "%p", va_arg(argp, void *));
rlm@1:         pushstr(L, buff);
rlm@1:         break;
rlm@1:       }
rlm@1:       case '%': {
rlm@1:         pushstr(L, "%");
rlm@1:         break;
rlm@1:       }
rlm@1:       default: {
rlm@1:         char buff[3];
rlm@1:         buff[0] = '%';
rlm@1:         buff[1] = *(e+1);
rlm@1:         buff[2] = '\0';
rlm@1:         pushstr(L, buff);
rlm@1:         break;
rlm@1:       }
rlm@1:     }
rlm@1:     n += 2;
rlm@1:     fmt = e+2;
rlm@1:   }
rlm@1:   pushstr(L, fmt);
rlm@1:   luaV_concat(L, n+1, cast_int(L->top - L->base) - 1);
rlm@1:   L->top -= n;
rlm@1:   return svalue(L->top - 1);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
rlm@1:   const char *msg;
rlm@1:   va_list argp;
rlm@1:   va_start(argp, fmt);
rlm@1:   msg = luaO_pushvfstring(L, fmt, argp);
rlm@1:   va_end(argp);
rlm@1:   return msg;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: void luaO_chunkid (char *out, const char *source, size_t bufflen) {
rlm@1:   if (*source == '=') {
rlm@1:     strncpy(out, source+1, bufflen);  /* remove first char */
rlm@1:     out[bufflen-1] = '\0';  /* ensures null termination */
rlm@1:   }
rlm@1:   else {  /* out = "source", or "...source" */
rlm@1:     if (*source == '@') {
rlm@1:       size_t l;
rlm@1:       source++;  /* skip the `@' */
rlm@1:       bufflen -= sizeof(" '...' ");
rlm@1:       l = strlen(source);
rlm@1:       strcpy(out, "");
rlm@1:       if (l > bufflen) {
rlm@1:         source += (l-bufflen);  /* get last part of file name */
rlm@1:         strcat(out, "...");
rlm@1:       }
rlm@1:       strcat(out, source);
rlm@1:     }
rlm@1:     else {  /* out = [string "string"] */
rlm@1:       size_t len = strcspn(source, "\n\r");  /* stop at first newline */
rlm@1:       bufflen -= sizeof(" [string \"...\"] ");
rlm@1:       if (len > bufflen) len = bufflen;
rlm@1:       strcpy(out, "[string \"");
rlm@1:       if (source[len] != '\0') {  /* must truncate? */
rlm@1:         strncat(out, source, len);
rlm@1:         strcat(out, "...");
rlm@1:       }
rlm@1:       else
rlm@1:         strcat(out, source);
rlm@1:       strcat(out, "\"]");
rlm@1:     }
rlm@1:   }
rlm@1: }