Add itoa and utoa to see what Denis Vlasenko thinks.

git-svn-id: svn://busybox.net/trunk/busybox@15673 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 50 insertions, 1 deletions

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 684d0a4fb..00cacaadf 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -229,4 +229,53 @@ int wait4pid(int pid)
         if (WIFSIGNALED(status)) return WTERMSIG(status);
         return 0;
 }
-#endif  
+#endif
+
+#ifdef L_itoa
+// Largest 32 bit integer is -2 billion plus null terminator.
+// Int should always be 32 bits on a Unix-oid system, see
+// http://www.unix.org/whitepapers/64bit.html
+static char local_buf[12];
+
+void utoa_to_buf(unsigned n, char *buf, int buflen)
+{
+        int i, out = 0;
+        for (i=1000000000; i; i/=10) {
+                int res = n/i;
+
+                if (res || out || i == 1) {
+                        out++;
+                        n -= res*i;
+                        *buf++ = '0' + res;
+                }
+        }
+        *buf = 0;
+}
+
+// Note: uses static buffer, calling it twice in a row will overwrite.
+
+char *utoa(unsigned n)
+{
+        utoa_to_buf(n, local_buf, sizeof(local_buf));
+
+        return local_buf;
+}
+
+void itoa_to_buf(int n, char *buf, int buflen)
+{
+        if (n<0) {
+                n = -n;
+                *buf++ = '-';
+        }
+        utoa_to_buf((unsigned)n, buf, buflen);
+}
+
+// Note: uses static buffer, calling it twice in a row will overwrite.
+
+char *itoa(int n)
+{
+        itoa_to_buf(n, local_buf, sizeof(local_buf));
+
+        return local_buf;
+}
+#endif