static tb_char_t* tb_printf_string(tb_char_t* pb, tb_char_t* pe, tb_printf_entry_t e, tb_char_t const* s)
{
if (s)
{
tb_int_t n = tb_strnlen(s, e.precision);
// fill space at left side, e.g. " abcd"
if (!(e.flags & TB_PRINTF_FLAG_LEFT))
{
while (n < e.width--)
if (pb < pe) *pb++ = ' ';
}
// copy string
tb_int_t i = 0;
for (i = 0; i < n; ++i)
if (pb < pe) *pb++ = *s++;
// fill space at right side, e.g. "abcd "
while (n < e.width--)
if (pb < pe) *pb++ = ' ';
}
else
{
// null
if (pb < pe) *pb++ = 'n';
if (pb < pe) *pb++ = 'u';
if (pb < pe) *pb++ = 'l';
if (pb < pe) *pb++ = 'l';
}
return pb;
}
/* //////////////////////////////////////////////////////////////////////////////////////
* interfaces
*/
tb_size_t tb_strlen(tb_char_t const* s)
{
// check
#ifdef __tb_debug__
{
// overflow?
tb_size_t size = tb_pool_data_size(s);
if (size)
{
// no '\0'?
tb_size_t real = tb_strnlen(s, size);
if (s[real])
{
tb_trace_i("[strlen]: [overflow]: [%p, %lu]", s, size);
tb_backtrace_dump("[strlen]: [overflow]: ", tb_null, 10);
tb_pool_data_dump(s, tb_true, "\t[malloc]: [from]: ");
tb_abort();
}
}
}
#endif
// done
return tb_strlen_impl(s);
}
static tb_void_t tb_test_strnlen(tb_char_t const* s, tb_size_t size)
{
__tb_volatile__ tb_long_t n = 1000000;
__tb_volatile__ tb_long_t r = 0;
tb_hong_t t = tb_mclock();
while (n--)
{
r = tb_strnlen(s, size);
}
t = tb_mclock() - t;
tb_printf("%lld ms, tb_test_strnlen(%s, %u) = %ld\n", t, s, size, r);
}
tb_char_t* tb_strndup(tb_char_t const* s, tb_size_t n)
{
// check
tb_assert_and_check_return_val(s, tb_null);
// done
n = tb_strnlen(s, n);
__tb_register__ tb_char_t* p = tb_malloc_cstr(n + 1);
if (p)
{
tb_memcpy(p, s, n);
p[n] = '\0';
}
return p;
}
