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option 'c' in 'string.pack' accepts any string size (truncating

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if larger and padding if smaller)
This commit is contained in:
Roberto Ierusalimschy 2015-10-28 15:56:51 -02:00
parent 6707ce6349
commit cc3a42b190
1 changed files with 8 additions and 3 deletions
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11
lstrlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lstrlib.c,v 1.234 2015/09/28 18:05:01 roberto Exp roberto $
** $Id: lstrlib.c,v 1.235 2015/10/08 15:53:05 roberto Exp roberto $
** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h
*/
@ -1339,8 +1339,13 @@ static int str_pack (lua_State *L) {
case Kchar: { /* fixed-size string */
size_t len;
const char *s = luaL_checklstring(L, arg, &len);
luaL_argcheck(L, len == (size_t)size, arg, "wrong length");
luaL_addlstring(&b, s, size);
if (size <= len) /* string larger than (or equal to) needed? */
luaL_addlstring(&b, s, size); /* truncate string to asked size */
else { /* string smaller than needed */
luaL_addlstring(&b, s, len); /* add it all */
while (len++ < size) /* pad extra space */
luaL_addchar(&b, LUA_PACKPADBYTE);
}
break;
}
case Kstring: { /* strings with length count */