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