int luaV_towstring (lua_State *L, TObject *obj) {
if (ttype(obj) != LUA_TNUMBER)
return 0;
else {
lua_WChar s[32]; /* 16 digits, sign, point and \0 (+ some extra...) */
lua_number2wstr((s), 32, nvalue(obj)); /* convert `s' to number */
setwsvalue2s(obj, luaWS_new(L, s));
return 1;
}
}
int luaV_towstring (lua_State *L, TValue *obj) {
if (ttype(obj) != LUA_TNUMBER)
return 0;
else {
char s[32]; /* 16 digits, sign, point and \0 (+ some extra...) */
lua_WChar ws[32]; /* 16 digits, sign, point and \0 (+ some extra...) */
char* ptr = s;
lua_WChar* wptr = ws;
lua_number2wstr(s, nvalue(obj)); /* convert `s' to number */
while (*ptr != 0)
*wptr++ = *ptr++;
*wptr = 0;
setwsvalue2s(L, obj, luaWS_new(L, ws));
return 1;
}
}
void luaV_concat (lua_State *L, int total, int last) {
int useType = LUA_TSTRING;
int i;
StkId top = L->base + last + 1;
for (i = 0; i < total; ++i)
{
if (ttype(top-1-i) == LUA_TSTRING || ttype(top-1-i) == LUA_TWSTRING)
{
useType = ttype(top-1-i);
break;
}
}
if (useType == LUA_TSTRING)
{
do {
StkId top = L->base + last + 1;
int n = 2; /* number of elements handled in this pass (at least 2) */
if (!tostring(L, top-2) || !tostring(L, top-1)) {
if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
luaG_concaterror(L, top-2, top-1);
} else if (tsvalue(top-1)->len > 0) { /* if len=0, do nothing */
/* at least two string values; get as many as possible */
size_t tl = tsvalue(top-1)->len;
char *buffer;
int i;
/* collect total length */
for (n = 1; n < total && tostring(L, top-n-1); n++) {
size_t l = tsvalue(top-n-1)->len;
if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
tl += l;
}
buffer = luaZ_openspace(L, &G(L)->buff, tl);
tl = 0;
for (i=n; i>0; i--) { /* concat all strings */
size_t l = tsvalue(top-i)->len;
memcpy(buffer+tl, svalue(top-i), l);
tl += l;
#if LUA_REFCOUNT
luarc_cleanvalue(top-i);
#endif /* LUA_REFCOUNT */
}
setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
}
total -= n-1; /* got `n' strings to create 1 new */
last -= n-1;
} while (total > 1); /* repeat until only 1 result left */
} else {
do {
StkId top = L->base + last + 1;
int n = 2; /* number of elements handled in this pass (at least 2) */
if (!towstring(L, top-2) || !towstring(L, top-1)) {
if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
luaG_concaterror(L, top-2, top-1);
} else if (tsvalue(top-1)->len > 0) { /* if len=0, do nothing */
/* at least two string values; get as many as possible */
size_t tl = tsvalue(top-1)->len;
char *buffer;
int i;
/* collect total length */
for (n = 1; n < total && towstring(L, top-n-1); n++) {
size_t l = tsvalue(top-n-1)->len;
if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
tl += l;
}
buffer = luaZ_openspace(L, &G(L)->buff, tl*2);
tl = 0;
for (i=n; i>0; i--) { /* concat all strings */
size_t l = tsvalue(top-i)->len;
memcpy(buffer+tl*2, wsvalue(top-i), l*2);
tl += l;
#if LUA_REFCOUNT
luarc_cleanvalue(top-i);
#endif /* LUA_REFCOUNT */
}
setwsvalue2s(L, top-n, luaS_newlwstr(L, (const lua_WChar*)buffer, tl));
}
total -= n-1; /* got `n' strings to create 1 new */
last -= n-1;
} while (total > 1); /* repeat until only 1 result left */
}
}
