1 files changed, 20 insertions, 0 deletions

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 38e612e66da..385c40291cd 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -212,6 +212,26 @@ char *put_dec(char *buf, unsigned long long num)
         }
 }
 
+/*
+ * Convert passed number to decimal string.
+ * Returns the length of string.  On buffer overflow, returns 0.
+ *
+ * If speed is not important, use snprintf(). It's easy to read the code.
+ */
+int num_to_str(char *buf, int size, unsigned long long num)
+{
+        char tmp[21];           /* Enough for 2^64 in decimal */
+        int idx, len;
+
+        len = put_dec(tmp, num) - tmp;
+
+        if (len > size)
+                return 0;
+        for (idx = 0; idx < len; ++idx)
+                buf[idx] = tmp[len - idx - 1];
+        return  len;
+}
+
 #define ZEROPAD 1               /* pad with zero */
 #define SIGN    2               /* unsigned/signed long */
 #define PLUS    4               /* show plus */