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-rw-r--r--libbuild2/utility.cxx45
1 files changed, 45 insertions, 0 deletions
diff --git a/libbuild2/utility.cxx b/libbuild2/utility.cxx
index 909db07..1135851 100644
--- a/libbuild2/utility.cxx
+++ b/libbuild2/utility.cxx
@@ -86,6 +86,51 @@ namespace build2
//
namespace build2
{
+ static const char hex_digits[] = "0123456789abcdef";
+
+ string
+ to_string (uint64_t i, int b, size_t w)
+ {
+ // One day we can switch to C++17 std::to_chars().
+ //
+ string r;
+ switch (b)
+ {
+ case 10:
+ {
+ r = to_string (i);
+ if (w > r.size ())
+ r.insert (0, w - r.size (), '0');
+ break;
+ }
+ case 16:
+ {
+ r.reserve (18);
+ r += "0x";
+
+ for (size_t j (64); j != 0; )
+ {
+ j -= 4;
+ size_t d ((i >> j) & 0x0f);
+
+ // Omit leading zeros but watch out for the i==0 corner case.
+ //
+ if (d != 0 || r.size () != 2 || j == 0)
+ r += hex_digits[d];
+ }
+
+ if (w > r.size () - 2)
+ r.insert (2, w - (r.size () - 2), '0');
+
+ break;
+ }
+ default:
+ throw invalid_argument ("unsupported base");
+ }
+
+ return r;
+ }
+
void (*terminate) (bool);
process_path argv0;