CHDK_DE Vorschauversion  Trunk Rev. 5249
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lstring.c-Dateireferenz
#include <string.h>
#include "lua.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
+ Include-Abhängigkeitsdiagramm für lstring.c:

gehe zum Quellcode dieser Datei

Makrodefinitionen

#define lstring_c
 
#define LUA_CORE
 

Funktionen

LUAI_FUNC void luaS_resize (lua_State *L, int newsize)
 
static TStringnewlstr (lua_State *L, const char *str, size_t l, unsigned int h)
 
LUAI_FUNC TStringluaS_newlstr (lua_State *L, const char *str, size_t l)
 
LUAI_FUNC UdataluaS_newudata (lua_State *L, size_t s, Table *e)
 

Makro-Dokumentation

#define lstring_c

Definiert in Zeile 10 der Datei lstring.c.

#define LUA_CORE

Definiert in Zeile 11 der Datei lstring.c.

Dokumentation der Funktionen

LUAI_FUNC TString* luaS_newlstr ( lua_State L,
const char *  str,
size_t  l 
)

Definiert in Zeile 75 der Datei lstring.c.

75  {
76  GCObject *o;
77  unsigned int h = cast(unsigned int, l); /* seed */
78  size_t step = (l>>5)+1; /* if string is too long, don't hash all its chars */
79  size_t l1;
80  for (l1=l; l1>=step; l1-=step) /* compute hash */
81  h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1]));
82  for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
83  o != NULL;
84  o = o->gch.next) {
85  TString *ts = rawgco2ts(o);
86  if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0)) {
87  /* string may be dead */
88  if (isdead(G(L), o)) changewhite(o);
89  return ts;
90  }
91  }
92  return newlstr(L, str, l, h); /* not found */
93 }
LUAI_FUNC Udata* luaS_newudata ( lua_State L,
size_t  s,
Table e 
)

Definiert in Zeile 96 der Datei lstring.c.

96  {
97  Udata *u;
98  if (s > MAX_SIZET - sizeof(Udata))
99  luaM_toobig(L);
100  u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata)));
101  u->uv.marked = luaC_white(G(L)); /* is not finalized */
102  u->uv.tt = LUA_TUSERDATA;
103  u->uv.len = s;
104  u->uv.metatable = NULL;
105  u->uv.env = e;
106  /* chain it on udata list (after main thread) */
107  u->uv.next = G(L)->mainthread->next;
108  G(L)->mainthread->next = obj2gco(u);
109  return u;
110 }
LUAI_FUNC void luaS_resize ( lua_State L,
int  newsize 
)

Definiert in Zeile 22 der Datei lstring.c.

22  {
23  GCObject **newhash;
24  stringtable *tb;
25  int i;
26  if (G(L)->gcstate == GCSsweepstring)
27  return; /* cannot resize during GC traverse */
28  newhash = luaM_newvector(L, newsize, GCObject *);
29  tb = &G(L)->strt;
30  for (i=0; i<newsize; i++) newhash[i] = NULL;
31  /* rehash */
32  for (i=0; i<tb->size; i++) {
33  GCObject *p = tb->hash[i];
34  while (p) { /* for each node in the list */
35  GCObject *next = p->gch.next; /* save next */
36  unsigned int h = gco2ts(p)->hash;
37  int h1 = lmod(h, newsize); /* new position */
38  lua_assert(cast_int(h%newsize) == lmod(h, newsize));
39  p->gch.next = newhash[h1]; /* chain it */
40  newhash[h1] = p;
41  p = next;
42  }
43  }
44  luaM_freearray(L, tb->hash, tb->size, TString *);
45  tb->size = newsize;
46  tb->hash = newhash;
47 }
static TString* newlstr ( lua_State L,
const char *  str,
size_t  l,
unsigned int  h 
)
static

Definiert in Zeile 50 der Datei lstring.c.

51  {
52  TString *ts;
53  stringtable *tb;
54  if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
55  luaM_toobig(L);
56  ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
57  ts->tsv.len = l;
58  ts->tsv.hash = h;
59  ts->tsv.marked = luaC_white(G(L));
60  ts->tsv.tt = LUA_TSTRING;
61  ts->tsv.reserved = 0;
62  memcpy(ts+1, str, l*sizeof(char));
63  ((char *)(ts+1))[l] = '\0'; /* ending 0 */
64  tb = &G(L)->strt;
65  h = lmod(h, tb->size);
66  ts->tsv.next = tb->hash[h]; /* chain new entry */
67  tb->hash[h] = obj2gco(ts);
68  tb->nuse++;
69  if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
70  luaS_resize(L, tb->size*2); /* too crowded */
71  return ts;
72 }