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-rw-r--r--sprintf.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/sprintf.c b/sprintf.c
index 9ad7e0c..c29b9f9 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -213,7 +213,12 @@ sign_bits(base, p)
* s | Argument is a string to be substituted. If the format
* | sequence contains a precision, at most that many characters
* | will be copied.
- * u | Treat argument as an unsigned decimal number.
+ * u | Treat argument as an unsigned decimal number. Negative integers
+ * | are displayed as a 32 bit two's complement plus one for the
+ * | underlying architecture; that is, 2 ** 32 + n. However, since
+ * | Ruby has no inherent limit on bits used to represent the
+ * | integer, this value is preceded by two dots (..) in order to
+ * | indicate a infinite number of leading sign bits.
* X | Convert argument as a hexadecimal number using uppercase
* | letters. Negative numbers will be displayed with two
* | leading periods (representing an infinite string of
@@ -230,6 +235,7 @@ sign_bits(base, p)
* sprintf("%1$*2$s %2$d %1$s", "hello", 8) #=> " hello 8 hello"
* sprintf("%1$*2$s %2$d", "hello", -8) #=> "hello -8"
* sprintf("%+g:% g:%-g", 1.23, 1.23, 1.23) #=> "+1.23: 1.23:1.23"
+ * sprintf("%u", -123) #=> "..4294967173"
*/
VALUE