printf: accept negative numbers for %x; sh: overflowed numbers are 0

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/coreutils/printf.c b/coreutils/printf.c
index 0b004eaeb..2beea7189 100644
--- a/coreutils/printf.c
+++ b/coreutils/printf.c
@@ -78,6 +78,14 @@ static int multiconvert(const char *arg, void *result, converter convert)
 static void FAST_FUNC conv_strtoull(const char *arg, void *result)
 {
         *(unsigned long long*)result = bb_strtoull(arg, NULL, 0);
+        /* both coreutils 6.10 and bash 3.2:
+         * $ printf '%x\n' -2
+         * fffffffffffffffe
+         * Mimic that:
+         */
+        if (errno) {
+                *(unsigned long long*)result = bb_strtoll(arg, NULL, 0);
+        }
 }
 static void FAST_FUNC conv_strtoll(const char *arg, void *result)
 {