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avoid warning about -unsigned value

This commit is contained in:
Roberto Ierusalimschy 2011-06-16 11:14:31 -03:00
parent cf0562e1e7
commit 817f8674af
2 changed files with 4 additions and 4 deletions
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4
lstrlib.c
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@ -1,5 +1,5 @@
/* /*
** $Id: lstrlib.c,v 1.167 2011/05/03 16:01:57 roberto Exp roberto $ ** $Id: lstrlib.c,v 1.168 2011/06/09 18:22:47 roberto Exp roberto $
** Standard library for string operations and pattern-matching ** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -45,7 +45,7 @@ static int str_len (lua_State *L) {
/* translate a relative string position: negative means back from end */ /* translate a relative string position: negative means back from end */
static size_t posrelat (ptrdiff_t pos, size_t len) { static size_t posrelat (ptrdiff_t pos, size_t len) {
if (pos >= 0) return (size_t)pos; if (pos >= 0) return (size_t)pos;
else if (-(size_t)pos > len) return 0; else if (0u - (size_t)pos > len) return 0;
else return len - ((size_t)-pos) + 1; else return len - ((size_t)-pos) + 1;
} }

4
ltable.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: ltable.c,v 2.58 2011/06/02 19:31:40 roberto Exp roberto $ ** $Id: ltable.c,v 2.59 2011/06/09 18:23:27 roberto Exp roberto $
** Lua tables (hash) ** Lua tables (hash)
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -88,7 +88,7 @@ static Node *hashnum (const Table *t, lua_Number n) {
int i; int i;
luai_hashnum(i, n); luai_hashnum(i, n);
if (i < 0) { if (i < 0) {
if ((unsigned int)i == -(unsigned int)i) if (cast(unsigned int, i) == 0u - i) /* use unsigned to avoid overflows */
i = 0; /* handle INT_MIN */ i = 0; /* handle INT_MIN */
i = -i; /* must be a positive value */ i = -i; /* must be a positive value */
} }