httpd: add -v[v]: prints client addresses, HTTP codes returned [and URLs]

get_line                                               -      70     +70
packed_usage                                       22811   22863     +52
handle_incoming_and_exit                            2246    2277     +31
httpd_main                                          1141    1155     +14
sendHeaders                                          489     482      -7
getLine                                               77       -     -77
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 3/1 up/down: 167/-84)            Total: 83 bytes
   text    data     bss     dec     hex filename
 774335    1058   11092  786485   c0035 busybox_old
 774447    1058   11092  786597   c00a5 busybox_unstripped

1 files changed, 7 insertions, 5 deletions

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 67c986640..4e17c28bd 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -484,12 +484,14 @@ int fdprintf(int fd, const char *format, ...)
 #else
         // Bloat for systems that haven't got the GNU extension.
         va_start(p, format);
-        r = vsnprintf(NULL, 0, format, p);
-        va_end(p);
-        string_ptr = xmalloc(r+1);
-        va_start(p, format);
-        r = vsnprintf(string_ptr, r+1, format, p);
+        r = vsnprintf(NULL, 0, format, p) + 1;
         va_end(p);
+        string_ptr = malloc(r);
+        if (string_ptr) {
+                va_start(p, format);
+                r = vsnprintf(string_ptr, r, format, p);
+                va_end(p);
+        }
 #endif
 
         if (r >= 0) {