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utils: support negative lexnums

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We use "lexnums" to efficiently/sortably store numbers >= 0; let's
support negative numbers as well (albeit not very optimal in size yet)
This commit is contained in:
Dirk-Jan C. Binnema
2026-07-23 11:05:08 +03:00
committed by Seth Ladygo
parent 51a2bc5f60
commit a03fd48551
3 changed files with 52 additions and 9 deletions
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19
lib/utils/tests/test-utils.cc
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@ -18,6 +18,7 @@
*/
#include <vector>
#include <limits>
#include <glib.h>
#include <iostream>
@ -302,6 +303,24 @@ test_to_from_lexnum()
g_assert_cmpuint(from_lexnum(to_lexnum(0)), ==, 0);
g_assert_cmpuint(from_lexnum(to_lexnum(7777)), ==, 7777);
g_assert_cmpuint(from_lexnum(to_lexnum(9876543)), ==, 9876543);
/* negative values have an uppercase prefix and thus sort before all
* positive values, in numerical order */
assert_equal(to_lexnum(-1), "Vffffffffffffffff");
g_assert_cmpint(from_lexnum(to_lexnum(-1)), ==, -1);
g_assert_cmpint(from_lexnum(to_lexnum(-12345)), ==, -12345);
g_assert_true(to_lexnum(-2) < to_lexnum(-1));
g_assert_true(to_lexnum(-1) < to_lexnum(0));
g_assert_true(to_lexnum(-12345) < to_lexnum(12345));
constexpr auto int64_min = std::numeric_limits<int64_t>::min();
constexpr auto int64_max = std::numeric_limits<int64_t>::max();
g_assert_cmpint(from_lexnum(to_lexnum(int64_min)), ==, int64_min);
g_assert_cmpint(from_lexnum(to_lexnum(int64_max)), ==, int64_max);
g_assert_true(to_lexnum(int64_min) < to_lexnum(-1));
g_assert_true(to_lexnum(0) < to_lexnum(int64_max));
g_assert_cmpint(from_lexnum(""), ==, 0);
}
static void