/*
** $Id: lobject.c,v 2.22.1.1 2007/12/27 13:02:25 roberto Exp $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/

#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define lobject_c
#define LUA_CORE

#include "lua.h"

#include "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "lvm.h"



const TValue luaO_nilobject_ = {{NULL}, LUA_TNIL};


/*
** converts an integer to a "floating point byte", represented as
** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
** eeeee != 0 and (xxx) otherwise.
*/
int luaO_int2fb (unsigned int x) {
  int e = 0;  /* expoent */
  while (x >= 16) {
    x = (x+1) >> 1;
    e++;
  }
  if (x < 8) return x;
  else return ((e+1) << 3) | (cast_int(x) - 8);
}


/* converts back */
int luaO_fb2int (int x) {
  int e = (x >> 3) & 31;
  if (e == 0) return x;
  else return ((x & 7)+8) << (e - 1);
}


int luaO_log2 (unsigned int x) {
  static const lu_byte log_2[256] = {
    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,
    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,
    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,
    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,
    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,
    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,
    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,
    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
  };
  int l = -1;
  while (x >= 256) { l += 8; x >>= 8; }
  return l + log_2[x];

}


int luaO_rawequalObj (const TValue *t1, const TValue *t2) {
  if (ttype(t1) != ttype(t2)) return 0;
  else switch (ttype(t1)) {
    case LUA_TNIL:
      return 1;
    case LUA_TNUMBER:
      return luai_numeq(nvalue(t1), nvalue(t2));
    case LUA_TBOOLEAN:
      return bvalue(t1) == bvalue(t2);  /* boolean true must be 1 !! */
    case LUA_TLIGHTUSERDATA:
      return pvalue(t1) == pvalue(t2);
    default:
      lua_assert(iscollectable(t1));
      return gcvalue(t1) == gcvalue(t2);
  }
}


/* BENILLA: the end of the decimal numeral at the head of `s` (spaces, a sign, digits with at
** most one `.`, then an exponent marker, a sign and digits only when a digit follows), or `s`
** when it has no digit: the grammar of the 1.12.1 client's strtod (0x741e39, its state machine
** 0x4111f0), which its luaO_str2d (0x6f5900) calls. Its exponent marker is `e`, `E`, `d` or `D`
** (0x4112d1-0x4112f1), and `*dexp` is set to a `d`/`D` one, which a C99 strtod does not read. A
** C99 strtod also reads further, into hexadecimal ("0x10", "0x1p4") and "inf"/"nan", none of
** which that client reads as a number. See third_party/lua-src/BENILLA.md.
*/
static const char *decimal_end (const char *s, const char **dexp) {
  const char *p = s;
  int digits = 0;
  *dexp = NULL;
  while (isspace(cast(unsigned char, *p))) p++;
  if (*p == '+' || *p == '-') p++;
  while (isdigit(cast(unsigned char, *p))) { p++; digits++; }
  if (*p == '.') {
    p++;
    while (isdigit(cast(unsigned char, *p))) { p++; digits++; }
  }
  if (digits == 0) return s;
  if (*p == 'e' || *p == 'E' || *p == 'd' || *p == 'D') {
    const char *e = p + 1;
    if (*e == '+' || *e == '-') e++;
    if (isdigit(cast(unsigned char, *e))) {
      while (isdigit(cast(unsigned char, *e))) e++;
      if (*p == 'd' || *p == 'D') *dexp = p;
      p = e;
    }
  }
  return p;
}


int luaO_str2d (const char *s, lua_Number *result) {
  char *endptr;
  const char *dexp;
  const char *end = decimal_end(s, &dexp);  /* BENILLA: see decimal_end */
  if (end == s) return 0;  /* conversion failed */
  if (dexp != NULL) {
    /* BENILLA: the numeral again with its `d` exponent spelled `e`, for the platform's strtod */
    size_t n = cast(size_t, end - s);
    char small[64];
    char *buf = n < sizeof(small) ? small : cast(char *, malloc(n + 1));
    int whole;
    if (buf == NULL) return 0;
    memcpy(buf, s, n);
    buf[n] = '\0';
    buf[dexp - s] = 'e';
    *result = lua_str2number(buf, &endptr);
    whole = (endptr == buf + n);
    if (buf != small) free(buf);
    if (!whole) return 0;
    endptr = cast(char *, end);
  }
  else
    *result = lua_str2number(s, &endptr);
  /* BENILLA: 5.1's hexadecimal branch (`strtoul(s, &endptr, 16)` on a trailing `x`) is gone, as
  ** 0x6f5900 has none. A strtod that read past the decimal numeral read hexadecimal, whose
  ** decimal head "0" is followed by an `x`: an invalid trailing character there. */
  if (endptr != end) return 0;
  if (*endptr == '\0') return 1;  /* most common case */
  while (isspace(cast(unsigned char, *endptr))) endptr++;
  if (*endptr != '\0') return 0;  /* invalid trailing characters? */
  return 1;
}



static void pushstr (lua_State *L, const char *str) {
  setsvalue2s(L, L->top, luaS_new(L, str));
  incr_top(L);
}


/* this function handles only `%d', `%c', %f, %p, and `%s' formats */
const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
  int n = 1;
  pushstr(L, "");
  for (;;) {
    const char *e = strchr(fmt, '%');
    if (e == NULL) break;
    setsvalue2s(L, L->top, luaS_newlstr(L, fmt, e-fmt));
    incr_top(L);
    switch (*(e+1)) {
      case 's': {
        const char *s = va_arg(argp, char *);
        if (s == NULL) s = "(null)";
        pushstr(L, s);
        break;
      }
      case 'c': {
        char buff[2];
        buff[0] = cast(char, va_arg(argp, int));
        buff[1] = '\0';
        pushstr(L, buff);
        break;
      }
      case 'd': {
        setnvalue(L->top, cast_num(va_arg(argp, int)));
        incr_top(L);
        break;
      }
      case 'f': {
        setnvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
        incr_top(L);
        break;
      }
      case 'p': {
        char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
        sprintf(buff, "%p", va_arg(argp, void *));
        pushstr(L, buff);
        break;
      }
      case '%': {
        pushstr(L, "%");
        break;
      }
      default: {
        char buff[3];
        buff[0] = '%';
        buff[1] = *(e+1);
        buff[2] = '\0';
        pushstr(L, buff);
        break;
      }
    }
    n += 2;
    fmt = e+2;
  }
  pushstr(L, fmt);
  luaV_concat(L, n+1, cast_int(L->top - L->base) - 1);
  L->top -= n;
  return svalue(L->top - 1);
}


const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
  const char *msg;
  va_list argp;
  va_start(argp, fmt);
  msg = luaO_pushvfstring(L, fmt, argp);
  va_end(argp);
  return msg;
}


void luaO_chunkid (char *out, const char *source, size_t bufflen) {
  if (*source == '=') {
    strncpy(out, source+1, bufflen);  /* remove first char */
    out[bufflen-1] = '\0';  /* ensures null termination */
  }
  else {  /* out = "source", or "...source" */
    if (*source == '@') {
      size_t l;
      source++;  /* skip the `@' */
      bufflen -= sizeof(" '...' ");
      l = strlen(source);
      strcpy(out, "");
      if (l > bufflen) {
        source += (l-bufflen);  /* get last part of file name */
        strcat(out, "...");
      }
      strcat(out, source);
    }
    else {  /* out = [string "string"] */
      size_t len = strcspn(source, "\n\r");  /* stop at first newline */
      bufflen -= sizeof(" [string \"...\"] ");
      if (len > bufflen) len = bufflen;
      strcpy(out, "[string \"");
      if (source[len] != '\0') {  /* must truncate? */
        strncat(out, source, len);
        strcat(out, "...");
      }
      else
        strcat(out, source);
      strcat(out, "\"]");
    }
  }
}