[Xen-devel] [PATCH] tools/ocaml/libs/xc fix gcc-8 format-truncation warning

[John Thomson <git@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

 CC       xenctrl_stubs.o
xenctrl_stubs.c: In function 'failwith_xc':
xenctrl_stubs.c:65:17: error: 'snprintf' output may be truncated before the 
last format character [-Werror=format-truncation=]
      "%d: %s: %s", error->code,
                 ^
xenctrl_stubs.c:64:4: note: 'snprintf' output 6 or more bytes (assuming 1029) 
into a destination of size 1028
    snprintf(error_str, sizeof(error_str),
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      "%d: %s: %s", error->code,
      ~~~~~~~~~~~~~~~~~~~~~~~~~~
      xc_error_code_to_desc(error->code),
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      error->message);
      ~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[8]: *** 
[/build/xen-git/src/xen/tools/ocaml/libs/xc/../../Makefile.rules:37: 
xenctrl_stubs.o] Error 1
m

Signed-off-by: John Thomson <git@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---
 tools/ocaml/libs/xc/xenctrl_stubs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c 
b/tools/ocaml/libs/xc/xenctrl_stubs.c
index f97070c8b0..d4309ad97e 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -54,7 +54,7 @@
 
 static void Noreturn failwith_xc(xc_interface *xch)
 {
-       char error_str[1028];
+       char error_str[XC_MAX_ERROR_MSG_LEN + 6];
        if (xch) {
                const xc_error *error = xc_get_last_error(xch);
                if (error->code == XC_ERROR_NONE)
-- 
2.17.0


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