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msi: Comparisons with null in conditions are special.

This commit is contained in:
Mike McCormack 2006-12-06 22:29:08 +09:00 committed by Alexandre Julliard
parent 690c852540
commit 9dce96b315
1 changed files with 72 additions and 27 deletions
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99
dlls/msi/cond.y
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@ -431,59 +431,104 @@ static INT compare_substring( LPCWSTR a, INT operator, LPCWSTR b )
case COND_ISS:
return strstriW( a, b ) ? 1 : 0;
case COND_LHS:
return 0 == strncmpW( a, b, lstrlenW( b ) );
return 0 == strncmpW( a, b, lstrlenW( b ) );
case COND_RHS:
return 0 == lstrcmpW( a + (lstrlenW( a ) - lstrlenW( b )), b );
return 0 == lstrcmpW( a + (lstrlenW( a ) - lstrlenW( b )), b );
case COND_ILHS:
return 0 == strncmpiW( a, b, lstrlenW( b ) );
return 0 == strncmpiW( a, b, lstrlenW( b ) );
case COND_IRHS:
return 0 == lstrcmpiW( a + (lstrlenW( a ) - lstrlenW( b )), b );
default:
ERR("invalid substring operator\n");
ERR("invalid substring operator\n");
return 0;
}
return 0;
}
static BOOL is_empty( LPCWSTR p )
{
return !p || !p[0];
}
static BOOL is_alphaless( LPCWSTR p )
{
while (*p)
{
if (isalphaW( *p ) || (*p == '_'))
return FALSE;
p++;
}
return TRUE;
}
static INT compare_string( LPCWSTR a, INT operator, LPCWSTR b )
{
int r;
if (operator >= COND_SS && operator <= COND_RHS)
return compare_substring( a, operator, b );
/* null and empty string are equivalent */
if (!a) a = szEmpty;
if (!b) b = szEmpty;
/* a or b may be NULL */
if (is_empty( a ) && is_empty( b ))
r = 0;
else if (is_empty( a ) && is_alphaless( b ))
r = 1;
else if (is_empty( b ) && is_alphaless( a ))
r = -1;
else
{
/* null and empty string are equivalent */
if (!a) a = szEmpty;
if (!b) b = szEmpty;
switch (operator)
{
case COND_LT:
case COND_GT:
case COND_EQ:
case COND_NE:
case COND_GE:
case COND_LE:
r = lstrcmpW( a, b );
break;
case COND_ILT:
case COND_IGT:
case COND_IEQ:
case COND_INE:
case COND_IGE:
case COND_ILE:
r = lstrcmpiW( a, b );
break;
default:
ERR("invalid string operator\n");
return 0;
}
}
switch (operator)
{
case COND_LT:
return -1 == lstrcmpW( a, b );
case COND_GT:
return 1 == lstrcmpW( a, b );
case COND_EQ:
return 0 == lstrcmpW( a, b );
case COND_NE:
return 0 != lstrcmpW( a, b );
case COND_GE:
return -1 != lstrcmpW( a, b );
case COND_LE:
return 1 != lstrcmpW( a, b );
case COND_ILT:
return -1 == lstrcmpiW( a, b );
return -1 == r;
case COND_GT:
case COND_IGT:
return 1 == lstrcmpiW( a, b );
return 1 == r;
case COND_EQ:
case COND_IEQ:
return 0 == lstrcmpiW( a, b );
return 0 == r;
case COND_NE:
case COND_INE:
return 0 != lstrcmpiW( a, b );
return 0 != r;
case COND_GE:
case COND_IGE:
return -1 != lstrcmpiW( a, b );
return -1 != r;
case COND_LE:
case COND_ILE:
return 1 != lstrcmpiW( a, b );
return 1 != r;
default:
ERR("invalid string operator\n");
return 0;
}
return 0;
}