1 From 24b87607c1353e94689e8a2190571ab3f3b36f31 Mon Sep 17 00:00:00 2001
2 From: =?UTF-8?q?Petr=20Men=C5=A1=C3=ADk?= <pemensik@redhat.com>
3 Date: Wed, 24 Oct 2018 22:30:18 +0100
4 Subject: [PATCH 07/30] Do not rely on dead code elimination, use array
5 instead. Make options bits derived from size and count. Use size of option
6 bits and last supported bit in computation. No new change would be required
7 when new options are added. Just change OPT_LAST constant.
9 Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
11 src/dnsmasq.h | 11 +++++++----
12 src/option.c | 10 ++--------
13 2 files changed, 9 insertions(+), 12 deletions(-)
17 @@ -200,9 +200,6 @@ struct event_desc {
19 #define EC_INIT_OFFSET 10
21 -/* Trust the compiler dead-code eliminator.... */
22 -#define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
24 #define OPT_BOGUSPRIV 0
27 @@ -264,6 +261,12 @@ struct event_desc {
31 +#define OPTION_BITS (sizeof(unsigned int)*8)
32 +#define OPTION_SIZE ( (OPT_LAST/OPTION_BITS)+((OPT_LAST%OPTION_BITS)!=0) )
33 +#define option_var(x) (daemon->options[(x) / OPTION_BITS])
34 +#define option_val(x) ((1u) << ((x) % OPTION_BITS))
35 +#define option_bool(x) (option_var(x) & option_val(x))
37 /* extra flags for my_syslog, we use a couple of facilities since they are known
38 not to occupy the same bits as priorities, no matter how syslog.h is set up. */
39 #define MS_TFTP LOG_USER
40 @@ -978,7 +981,7 @@ extern struct daemon {
41 config file arguments. All set (including defaults)
44 - unsigned int options, options2;
45 + unsigned int options[OPTION_SIZE];
46 struct resolvc default_resolv, *resolv_files;
51 @@ -1490,18 +1490,12 @@ static int parse_dhcp_opt(char *errstr,
53 void set_option_bool(unsigned int opt)
56 - daemon->options |= 1u << opt;
58 - daemon->options2 |= 1u << (opt - 32);
59 + option_var(opt) |= option_val(opt);
62 void reset_option_bool(unsigned int opt)
65 - daemon->options &= ~(1u << opt);
67 - daemon->options2 &= ~(1u << (opt - 32));
68 + option_var(opt) &= ~(option_val(opt));
71 static int one_opt(int option, char *arg, char *errstr, char *gen_err, int command_line, int servers_only)