/* Test for message: argument %d is converted from '%s' to '%s' due to prototype [259] */
/*
* This warning detects function calls that are translated in very different
* translation environments, one where prototypes are omitted, and one where
* prototypes are active. It is possible to make such code interoperable,
* but that requires that each argument is converted to its proper type by
* the caller of the function.
*
* When lint is run with the '-s' flag, it no longer warns about code with
* incompatibilities between traditional C and C90, therefore this test omits
* all of the options '-t', '-s', '-S' and '-Ac11'.
*
* See also msg_297, which is about lossy integer conversions, but that
* requires the flags -a -p -P, which are not enabled in the default NetBSD
* build.
*/
void
change_in_type_width(char c, int i, long l)
{
plain_char(c);
signed_int(c);
/* No warning 259 on LP64, only on ILP32 */
signed_long(c);
plain_char(i); /* XXX: why no warning? */
signed_int(i);
/* No warning 259 on LP64, only on ILP32 */
signed_long(i);
plain_char(l); /* XXX: why no warning? */
/* expect+1: ... from 'long' to 'int' due to prototype [259] */
signed_int(l);
signed_long(l);
}
/*
* Converting a signed integer type to its corresponding unsigned integer
* type (C99 6.2.5p6) is usually not a problem since the actual values of the
* expressions are usually not anywhere near the maximum signed value. From
* a technical standpoint, it is correct to warn here since even small
* negative numbers may result in very large positive numbers.
*
* A common case where it occurs is when the difference of two pointers is
* converted to size_t. The type ptrdiff_t is defined to be signed, but in
* many practical cases, the expression is '(end - start)', which makes the
* resulting value necessarily positive.
*/
void
small_integer_types(char c, signed char sc, unsigned char uc,
signed short ss, unsigned short us,
signed int si, unsigned int ui,
signed long sl, unsigned long ul)
{
plain_char(c);
plain_char(sc);
plain_char(uc);
plain_char(ss);
plain_char(us);
plain_char(si);
plain_char(ui);
plain_char(sl);
plain_char(ul);
/*
* This function tests, among others, the conversion from a signed integer
* type to its corresponding unsigned integer type. Warning 259 is not
* about lossy integer conversions but about ABI calling conventions.
*
* A common case where a conversion from a signed integer type to its
* corresponding unsigned integer type occurs is when the difference of two
* pointers is converted to size_t. The type ptrdiff_t is defined to be
* signed, but in many practical cases, the expression is '(end - start)',
* which makes the resulting value necessarily positive.
*/
void
signed_to_unsigned(int si, long sl)
{
/* expect+1: warning: argument 1 is converted from 'int' to 'unsigned int' due to prototype [259] */
unsigned_int(si);
/* expect+1: warning: argument 1 is converted from 'long' to 'unsigned int' due to prototype [259] */
unsigned_int(sl);
/*
* No warning here. Even though 'unsigned long' is 64 bits wide, it
* cannot represent negative 32-bit values. This lossy conversion is
* covered by message 297 instead, which requires nonstandard flags.
*/
unsigned_long(si);
/* expect+1: warning: argument 1 is converted from 'long' to 'unsigned long' due to prototype [259] */
unsigned_long(sl);
}
void
unsigned_to_signed(unsigned int ui, unsigned long ul)
{
/* expect+1: warning: argument 1 is converted from 'unsigned int' to 'int' due to prototype [259] */
signed_int(ui);
/* expect+1: warning: argument 1 is converted from 'unsigned long' to 'int' due to prototype [259] */
signed_int(ul);
signed_long(ui);
/* expect+1: warning: argument 1 is converted from 'unsigned long' to 'long' due to prototype [259] */
signed_long(ul);
}
void
signed_to_signed(signed int si, signed long sl)
{
signed_int(si);
/* expect+1: warning: argument 1 is converted from 'long' to 'int' due to prototype [259] */
signed_int(sl);
signed_long(si);
signed_long(sl);
}
void
unsigned_to_unsigned(unsigned int ui, unsigned long ul)
{
unsigned_int(ui);
/* expect+1: warning: argument 1 is converted from 'unsigned long' to 'unsigned int' due to prototype [259] */
unsigned_int(ul);
unsigned_long(ui);
unsigned_long(ul);
}
void
pass_sizeof_as_smaller_type(void)
{
/*
* Even though the expression has type size_t, it has a constant
* value that fits effortless into an 'unsigned int', it's so small
* that it would even fit into a 3-bit bit-field, so lint's warning
* may seem wrong here.
*
* This warning 259 is not about lossy integer conversion though but
* instead covers calling conventions that may differ between integer
* types of different sizes, and from that point of view, the
* constant, even though its value would fit in an unsigned int, is
* still passed as size_t.
*/
/* expect+1: warning: argument 1 is converted from 'unsigned long' to 'unsigned int' due to prototype [259] */
unsigned_int(sizeof(int));
}
