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Do not rely on dead code elimination, use array instead.

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Make options bits derived from size and count. Use size of option bits
and last supported bit in computation. No new change would be required
when new options are added. Just change OPT_LAST constant.
This commit is contained in:
Petr Menšík
2018-10-24 22:30:18 +01:00
committed by Simon Kelley
parent 6f7812d97b
commit 24b87607c1
2 changed files with 9 additions and 12 deletions
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11
src/dnsmasq.h
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@@ -200,9 +200,6 @@ struct event_desc {
#define EC_MISC 5
#define EC_INIT_OFFSET 10
/* Trust the compiler dead-code eliminator.... */
#define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32)))
#define OPT_BOGUSPRIV 0
#define OPT_FILTER 1
#define OPT_LOG 2
@@ -264,6 +261,12 @@ struct event_desc {
#define OPT_UBUS 58
#define OPT_LAST 59
#define OPTION_BITS (sizeof(unsigned int)*8)
#define OPTION_SIZE ( (OPT_LAST/OPTION_BITS)+((OPT_LAST%OPTION_BITS)!=0) )
#define option_var(x) (daemon->options[(x) / OPTION_BITS])
#define option_val(x) ((1u) << ((x) % OPTION_BITS))
#define option_bool(x) (option_var(x) & option_val(x))
/* extra flags for my_syslog, we use a couple of facilities since they are known
not to occupy the same bits as priorities, no matter how syslog.h is set up. */
#define MS_TFTP LOG_USER
@@ -978,7 +981,7 @@ extern struct daemon {
config file arguments. All set (including defaults)
in option.c */
unsigned int options, options2;
unsigned int options[OPTION_SIZE];
struct resolvc default_resolv, *resolv_files;
time_t last_resolv;
char *servers_file;

10
src/option.c
View File

@@ -1490,18 +1490,12 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
void set_option_bool(unsigned int opt)
{
if (opt < 32)
daemon->options |= 1u << opt;
else
daemon->options2 |= 1u << (opt - 32);
option_var(opt) |= option_val(opt);
}
void reset_option_bool(unsigned int opt)
{
if (opt < 32)
daemon->options &= ~(1u << opt);
else
daemon->options2 &= ~(1u << (opt - 32));
option_var(opt) &= ~(option_val(opt));
}
static int one_opt(int option, char *arg, char *errstr, char *gen_err, int command_line, int servers_only)