void luaV_strconc (lua_State *L, int total, StkId top) {
do {
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, TM_CONCAT))
luaG_binerror(L, top-2, LUA_TSTRING, "concat");
}
else if (tsvalue(top-1)->len > 0) { /* if len=0, do nothing */
/* at least two string values; get as many as possible */
lint32 tl = (lint32)tsvalue(top-1)->len +
(lint32)tsvalue(top-2)->len;
char *buffer;
int i;
while (n < total && !tostring(L, top-n-1)) { /* collect total length */
tl += tsvalue(top-n-1)->len;
n++;
}
if (tl > MAX_SIZET) lua_error(L, "string size overflow");
buffer = luaO_openspace(L, tl);
tl = 0;
for (i=n; i>0; i--) { /* concat all strings */
size_t l = tsvalue(top-i)->len;
memcpy(buffer+tl, tsvalue(top-i)->str, l);
tl += l;
}
tsvalue(top-n) = luaS_newlstr(L, buffer, tl);
}
total -= n-1; /* got `n' strings to create 1 new */
top -= n-1;
} while (total > 1); /* repeat until only 1 result left */
}
static TString* LoadString (lua_State* L, ZIO* Z, int swap)
{
size_t size=LoadSize(L,Z,swap);
if (size==0)
return NULL;
else
{
char* s=luaO_openspace(L,size);
LoadBlock(L,s,size,Z,0);
return luaS_newlstr(L,s,size-1); /* remove trailing '\0' */
}
}
