printf: fix printf "%u\n" +18446744073709551614

function                                             old     new   delta
conv_strtoll                                          19      32     +13
conv_strtoull                                         49      61     +12
bb_strtoll                                            89      84      -5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 25/-5)              Total: 20 bytes

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 b2429c5cf..67d3b2eda 100644
--- a/coreutils/printf.c
+++ b/coreutils/printf.c
@@ -95,6 +95,12 @@ static int multiconvert(const char *arg, void *result, converter convert)
 
 static void FAST_FUNC conv_strtoull(const char *arg, void *result)
 {
+        /* Allow leading '+' - bb_strtoull() by itself does not allow it,
+         * and probably shouldn't (other callers might require purely numeric
+         * inputs to be allowed.
+         */
+        if (arg[0] == '+')
+                arg++;
         *(unsigned long long*)result = bb_strtoull(arg, NULL, 0);
         /* both coreutils 6.10 and bash 3.2:
          * $ printf '%x\n' -2
@@ -107,6 +113,8 @@ static void FAST_FUNC conv_strtoull(const char *arg, void *result)
 }
 static void FAST_FUNC conv_strtoll(const char *arg, void *result)
 {
+        if (arg[0] == '+')
+                arg++;
         *(long long*)result = bb_strtoll(arg, NULL, 0);
 }
 static void FAST_FUNC conv_strtod(const char *arg, void *result)