misc/liblua/lstring.c
author nemo
Tue, 16 Feb 2010 02:23:12 +0000
changeset 2818 df7ec369992b
parent 2812 0a24853de796
permissions -rw-r--r--
Should be equivalent, but in any case, not needed
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
2812
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     1
/*
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     2
** $Id: lstring.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     3
** String table (keeps all strings handled by Lua)
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     4
** See Copyright Notice in lua.h
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     5
*/
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     6
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     7
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     8
#include <string.h>
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
     9
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    10
#define lstring_c
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    11
#define LUA_CORE
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    12
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    13
#include "lua.h"
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    14
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    15
#include "lmem.h"
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    16
#include "lobject.h"
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    17
#include "lstate.h"
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    18
#include "lstring.h"
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    19
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    20
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    21
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    22
void luaS_resize (lua_State *L, int newsize) {
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    23
  GCObject **newhash;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    24
  stringtable *tb;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    25
  int i;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    26
  if (G(L)->gcstate == GCSsweepstring)
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    27
    return;  /* cannot resize during GC traverse */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    28
  newhash = luaM_newvector(L, newsize, GCObject *);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    29
  tb = &G(L)->strt;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    30
  for (i=0; i<newsize; i++) newhash[i] = NULL;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    31
  /* rehash */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    32
  for (i=0; i<tb->size; i++) {
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    33
    GCObject *p = tb->hash[i];
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    34
    while (p) {  /* for each node in the list */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    35
      GCObject *next = p->gch.next;  /* save next */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    36
      unsigned int h = gco2ts(p)->hash;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    37
      int h1 = lmod(h, newsize);  /* new position */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    38
      lua_assert(cast_int(h%newsize) == lmod(h, newsize));
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    39
      p->gch.next = newhash[h1];  /* chain it */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    40
      newhash[h1] = p;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    41
      p = next;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    42
    }
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    43
  }
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    44
  luaM_freearray(L, tb->hash, tb->size, TString *);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    45
  tb->size = newsize;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    46
  tb->hash = newhash;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    47
}
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    48
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    49
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    50
static TString *newlstr (lua_State *L, const char *str, size_t l,
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    51
                                       unsigned int h) {
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    52
  TString *ts;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    53
  stringtable *tb;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    54
  if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    55
    luaM_toobig(L);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    56
  ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    57
  ts->tsv.len = l;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    58
  ts->tsv.hash = h;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    59
  ts->tsv.marked = luaC_white(G(L));
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    60
  ts->tsv.tt = LUA_TSTRING;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    61
  ts->tsv.reserved = 0;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    62
  memcpy(ts+1, str, l*sizeof(char));
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    63
  ((char *)(ts+1))[l] = '\0';  /* ending 0 */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    64
  tb = &G(L)->strt;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    65
  h = lmod(h, tb->size);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    66
  ts->tsv.next = tb->hash[h];  /* chain new entry */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    67
  tb->hash[h] = obj2gco(ts);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    68
  tb->nuse++;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    69
  if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    70
    luaS_resize(L, tb->size*2);  /* too crowded */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    71
  return ts;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    72
}
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    73
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    74
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    75
TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    76
  GCObject *o;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    77
  unsigned int h = cast(unsigned int, l);  /* seed */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    78
  size_t step = (l>>5)+1;  /* if string is too long, don't hash all its chars */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    79
  size_t l1;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    80
  for (l1=l; l1>=step; l1-=step)  /* compute hash */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    81
    h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1]));
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    82
  for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    83
       o != NULL;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    84
       o = o->gch.next) {
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    85
    TString *ts = rawgco2ts(o);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    86
    if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0)) {
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    87
      /* string may be dead */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    88
      if (isdead(G(L), o)) changewhite(o);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    89
      return ts;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    90
    }
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    91
  }
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    92
  return newlstr(L, str, l, h);  /* not found */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    93
}
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    94
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    95
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    96
Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    97
  Udata *u;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    98
  if (s > MAX_SIZET - sizeof(Udata))
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
    99
    luaM_toobig(L);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   100
  u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata)));
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   101
  u->uv.marked = luaC_white(G(L));  /* is not finalized */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   102
  u->uv.tt = LUA_TUSERDATA;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   103
  u->uv.len = s;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   104
  u->uv.metatable = NULL;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   105
  u->uv.env = e;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   106
  /* chain it on udata list (after main thread) */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   107
  u->uv.next = G(L)->mainthread->next;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   108
  G(L)->mainthread->next = obj2gco(u);
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   109
  return u;
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   110
}
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   111