lua/lobject.c

/*
** $Id: lobject.c,v 2.66 2013/06/04 19:36:42 roberto Exp roberto $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/

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

#define lobject_c
#define LUA_CORE

#include "lua.h"

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



LUAI_DDEF const TValue luaO_nilobject_ = {NILCONSTANT};


/*
** 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;  /* exponent */
  if (x < 8) return x;
  while (x >= 0x10) {
    x = (x+1) >> 1;
    e++;
  }
  return ((e+1) << 3) | (cast_int(x) - 8);
}


/* converts back */
int luaO_fb2int (int x) {
  int e = (x >> 3) & 0x1f;
  if (e == 0) return x;
  else return ((x & 7) + 8) << (e - 1);
}


int luaO_ceillog2 (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 = 0;
  x--;
  while (x >= 256) { l += 8; x >>= 8; }
  return l + log_2[x];
}


static lua_Integer intarith (lua_State *L, int op, lua_Integer v1,
                                                   lua_Integer v2) {
  switch (op) {
    case LUA_OPADD: return intop(+, v1, v2);
    case LUA_OPSUB:return intop(-, v1, v2);
    case LUA_OPMUL:return intop(*, v1, v2);
    case LUA_OPMOD: return luaV_mod(L, v1, v2);
    case LUA_OPPOW: return luaV_pow(v1, v2);
    case LUA_OPUNM: return -v1;
    default: lua_assert(0); return 0;
  }
}


static lua_Number numarith (int op, lua_Number v1, lua_Number v2) {
  switch (op) {
    case LUA_OPADD: return luai_numadd(NULL, v1, v2);
    case LUA_OPSUB: return luai_numsub(NULL, v1, v2);
    case LUA_OPMUL: return luai_nummul(NULL, v1, v2);
    case LUA_OPDIV: return luai_numdiv(NULL, v1, v2);
    case LUA_OPMOD: return luai_nummod(NULL, v1, v2);
    case LUA_OPPOW: return luai_numpow(NULL, v1, v2);
    case LUA_OPUNM: return luai_numunm(NULL, v1);
    default: lua_assert(0); return 0;
  }
}


void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,
                 TValue *res) {
  if (op == LUA_OPIDIV) {  /* operates only on integers */
    lua_Integer i1; lua_Integer i2;
    if (tointeger(p1, &i1) && tointeger(p2, &i2)) {
      setivalue(res, luaV_div(L, i1, i2));
      return;
    }
    /* else go to the end */
  }
  else {  /* other operations */
    lua_Number n1; lua_Number n2;
    if (ttisinteger(p1) && ttisinteger(p2) && op != LUA_OPDIV &&
        (op != LUA_OPPOW || ivalue(p2) >= 0)) {
      setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2)));
      return;
    }
    else if (tonumber(p1, &n1) && tonumber(p2, &n2)) {
      setnvalue(res, numarith(op, n1, n2));
      return;
    }
    /* else go to the end */
  }
  /* could not perform raw operation; try metmethod */
  lua_assert(L != NULL);  /* cannot fail when folding (compile time) */
  luaT_trybinTM(L, p1, p2, res, cast(TMS, op - LUA_OPADD + TM_ADD));
}


int luaO_hexavalue (int c) {
  if (lisdigit(c)) return c - '0';
  else return ltolower(c) - 'a' + 10;
}


static int isneg (const char **s) {
  if (**s == '-') { (*s)++; return 1; }
  else if (**s == '+') (*s)++;
  return 0;
}


/*
** lua_strx2number converts an hexadecimal numeric string to a number.
** In C99, 'strtod' does both conversions. C89, however, has no function
** to convert floating hexadecimal strings to numbers. For these
** systems, you can leave 'lua_strx2number' undefined and Lua will
** provide its own implementation.
*/
#if defined(LUA_USE_STRTODHEX)
#define lua_strx2number(s,p)    lua_str2number(s,p)
#endif


#if !defined(lua_strx2number)

#include <math.h>


/* maximum number of significant digits to read (to avoid overflows
   even with single floats) */
#define MAXSIGDIG	30

/*
** convert an hexadecimal numeric string to a number, following
** C99 specification for 'strtod'
*/
static lua_Number lua_strx2number (const char *s, char **endptr) {
  lua_Number r = 0.0;  /* result (accumulator) */
  int sigdig = 0;  /* number of significant digits */
  int nosigdig = 0;  /* number of non-significant digits */
  int e = 0;  /* exponent correction */
  int neg = 0;  /* 1 if number is negative */
  int dot = 0;  /* true after seen a dot */
  *endptr = cast(char *, s);  /* nothing is valid yet */
  while (lisspace(cast_uchar(*s))) s++;  /* skip initial spaces */
  neg = isneg(&s);  /* check signal */
  if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X')))  /* check '0x' */
    return 0.0;  /* invalid format (no '0x') */
  for (s += 2; ; s++) {  /* skip '0x' and read numeral */
    if (*s == '.') {
      if (dot) break;  /* second dot? stop loop */
      else dot = 1;
    }
    else if (lisxdigit(cast_uchar(*s))) {
      if (sigdig == 0 && *s == '0') {  /* non-significant zero? */
        nosigdig++;
        if (dot) e--;  /* zero after dot? correct exponent */
      }
      else {
        if (++sigdig <= MAXSIGDIG) {  /* can read it without overflow? */
          r = (r * cast_num(16.0)) + luaO_hexavalue(cast_uchar(*s));
          if (dot) e--;  /* decimal digit */
        }
        else  /* too many digits; ignore */ 
          if (!dot) e++;  /* still count it for exponent */
      }
    }
    else break;  /* neither a dot nor a digit */
  }
  if (nosigdig + sigdig == 0)  /* no digits? */
    return 0.0;  /* invalid format */
  *endptr = cast(char *, s);  /* valid up to here */
  e *= 4;  /* each digit multiplies/divides value by 2^4 */
  if (*s == 'p' || *s == 'P') {  /* exponent part? */
    int exp1 = 0;  /* exponent value */
    int neg1;  /* exponent signal */
    s++;  /* skip 'p' */
    neg1 = isneg(&s);  /* signal */
    if (!lisdigit(cast_uchar(*s)))
      return 0.0;  /* invalid; must have at least one digit */
    while (lisdigit(cast_uchar(*s)))  /* read exponent */
      exp1 = exp1 * 10 + *(s++) - '0';
    if (neg1) exp1 = -exp1;
    e += exp1;
    *endptr = cast(char *, s);  /* valid up to here */
  }
  if (neg) r = -r;
  return l_mathop(ldexp)(r, e);
}

#endif


int luaO_str2d (const char *s, size_t len, lua_Number *result) {
  char *endptr;
  if (strpbrk(s, "nN"))  /* reject 'inf' and 'nan' */
    return 0;
  else if (strpbrk(s, "xX"))  /* hexa? */
    *result = lua_strx2number(s, &endptr);
  else
    *result = lua_str2number(s, &endptr);
  if (endptr == s) return 0;  /* nothing recognized */
  while (lisspace(cast_uchar(*endptr))) endptr++;
  return (endptr == s + len);  /* OK if no trailing characters */
}


int luaO_str2int (const char *s, size_t len, lua_Integer *result) {
  const char *ends = s + len;
  lua_Unsigned a = 0;
  int empty = 1;
  int neg;
  while (lisspace(cast_uchar(*s))) s++;  /* skip initial spaces */
  neg = isneg(&s);
  if (s[0] == '0' &&
      (s[1] == 'x' || s[1] == 'X')) {  /* hexa? */
    s += 2;  /* skip '0x' */
    for (; lisxdigit(cast_uchar(*s)); s++) {
      a = a * 16 + luaO_hexavalue(cast_uchar(*s));
      empty = 0;
    }
  }
  else {  /* decimal */
    for (; lisdigit(cast_uchar(*s)); s++) {
      a = a * 10 + luaO_hexavalue(cast_uchar(*s));
      empty = 0;
    }
  }
  while (lisspace(cast_uchar(*s))) s++;  /* skip trailing spaces */
  if (empty || s != ends) return 0;  /* something wrong in the numeral */
  else {
    if (neg) *result = -cast(lua_Integer, a);
    else *result = cast(lua_Integer, a);
    return 1;
  }
}


static void pushstr (lua_State *L, const char *str, size_t l) {
  setsvalue2s(L, L->top++, luaS_newlstr(L, str, 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 = 0;
  for (;;) {
    const char *e = strchr(fmt, '%');
    if (e == NULL) break;
    luaD_checkstack(L, 2);  /* fmt + item */
    pushstr(L, fmt, e - fmt);
    switch (*(e+1)) {
      case 's': {
        const char *s = va_arg(argp, char *);
        if (s == NULL) s = "(null)";
        pushstr(L, s, strlen(s));
        break;
      }
      case 'c': {
        char buff;
        buff = cast(char, va_arg(argp, int));
        pushstr(L, &buff, 1);
        break;
      }
      case 'd': {
        setivalue(L->top++, cast_int(va_arg(argp, int)));
        break;
      }
      case 'I': {
        setivalue(L->top++, cast_integer(va_arg(argp, lua_Integer)));
        break;
      }
      case 'f': {
        setnvalue(L->top++, cast_num(va_arg(argp, l_uacNumber)));
        break;
      }
      case 'p': {
        char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
        int l = sprintf(buff, "%p", va_arg(argp, void *));
        pushstr(L, buff, l);
        break;
      }
      case '%': {
        pushstr(L, "%", 1);
        break;
      }
      default: {
        luaG_runerror(L,
            "invalid option " LUA_QL("%%%c") " to " LUA_QL("lua_pushfstring"),
            *(e + 1));
      }
    }
    n += 2;
    fmt = e+2;
  }
  luaD_checkstack(L, 1);
  pushstr(L, fmt, strlen(fmt));
  if (n > 0) luaV_concat(L, n + 1);
  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;
}


/* number of chars of a literal string without the ending \0 */
#define LL(x)	(sizeof(x)/sizeof(char) - 1)

#define RETS	"..."
#define PRE	"[string \""
#define POS	"\"]"

#define addstr(a,b,l)	( memcpy(a,b,(l) * sizeof(char)), a += (l) )

void luaO_chunkid (char *out, const char *source, size_t bufflen) {
  size_t l = strlen(source);
  if (*source == '=') {  /* 'literal' source */
    if (l <= bufflen)  /* small enough? */
      memcpy(out, source + 1, l * sizeof(char));
    else {  /* truncate it */
      addstr(out, source + 1, bufflen - 1);
      *out = '\0';
    }
  }
  else if (*source == '@') {  /* file name */
    if (l <= bufflen)  /* small enough? */
      memcpy(out, source + 1, l * sizeof(char));
    else {  /* add '...' before rest of name */
      addstr(out, RETS, LL(RETS));
      bufflen -= LL(RETS);
      memcpy(out, source + 1 + l - bufflen, bufflen * sizeof(char));
    }
  }
  else {  /* string; format as [string "source"] */
    const char *nl = strchr(source, '\n');  /* find first new line (if any) */
    addstr(out, PRE, LL(PRE));  /* add prefix */
    bufflen -= LL(PRE RETS POS) + 1;  /* save space for prefix+suffix+'\0' */
    if (l < bufflen && nl == NULL) {  /* small one-line source? */
      addstr(out, source, l);  /* keep it */
    }
    else {
      if (nl != NULL) l = nl - source;  /* stop at first newline */
      if (l > bufflen) l = bufflen;
      addstr(out, source, l);
      addstr(out, RETS, LL(RETS));
    }
    memcpy(out, POS, (LL(POS) + 1) * sizeof(char));
  }
}