snmp.c: compilation fixes for AIX

The C and C++ standards allows the character type char to be signed or
unsigned, depending on the platform and compiler. Most systems,
including x86 GNU/Linux and Microsoft Windows, use signed char, but
those based on PowerPC and ARM processors typically use unsigned char.

This patch fixes a "comparison is always true" warning on AIX (powerpc)
which leads the compilation to abort because of the -Werror flag.

Being unsigned by default, a char is always >0.

Signed-off-by: Aurelien Reynaud <collectd@wattapower.net>
Signed-off-by: Florian Forster <octo@huhu.verplant.org>

diff --git a/src/snmp.c b/src/snmp.c
index 693cd8942ffc10919e6e7d9d9b1084096818a3e7..8e72ce60d99a8349e7b33f8809ced26bf0a3a37f 100644 (file)
--- a/src/snmp.c
+++ b/src/snmp.c
@@ -965,7 +965,7 @@ static int csnmp_strvbcopy (char *dst, /* {{{ */
   for (i = 0; i < num_chars; i++)
   {
     /* Check for control characters. */
-    if ((src[i] >= 0) && (src[i] < 32))
+    if ((unsigned char)src[i] < 32)
       return (csnmp_strvbcopy_hexstring (dst, vb, dst_size));
     dst[i] = src[i];
   }