[core] add const to reduce .data segment size

src/keyvalue.c

@@ -7,13 +7,13 @@
 #include <stdlib.h>
 #include <string.h>
 
-static keyvalue http_versions[] = {
+static const keyvalue http_versions[] = {
 	{ HTTP_VERSION_1_1, "HTTP/1.1" },
 	{ HTTP_VERSION_1_0, "HTTP/1.0" },
 	{ HTTP_VERSION_UNSET, NULL }
 };
 
-static keyvalue http_methods[] = {
+static const keyvalue http_methods[] = {
 	{ HTTP_METHOD_GET, "GET" },
 	{ HTTP_METHOD_HEAD, "HEAD" },
 	{ HTTP_METHOD_POST, "POST" },
@@ -56,7 +56,7 @@ static keyvalue http_methods[] = {
 	{ HTTP_METHOD_UNSET, NULL }
 };
 
-static keyvalue http_status[] = {
+static const keyvalue http_status[] = {
 	{ 100, "Continue" },
 	{ 101, "Switching Protocols" },
 	{ 102, "Processing" }, /* WebDAV */
@@ -110,7 +110,7 @@ static keyvalue http_status[] = {
 	{ -1, NULL }
 };
 
-static keyvalue http_status_body[] = {
+static const keyvalue http_status_body[] = {
 	{ 400, "400.html" },
 	{ 401, "401.html" },
 	{ 403, "403.html" },
@@ -126,7 +126,7 @@ static keyvalue http_status_body[] = {
 };
 
 
-const char *keyvalue_get_value(keyvalue *kv, int k) {
+const char *keyvalue_get_value(const keyvalue *kv, int k) {
 	int i;
 	for (i = 0; kv[i].value; i++) {
 		if (kv[i].key == k) return kv[i].value;
@@ -134,7 +134,7 @@ const char *keyvalue_get_value(keyvalue *kv, int k) {
 	return NULL;
 }
 
-int keyvalue_get_key(keyvalue *kv, const char *s) {
+int keyvalue_get_key(const keyvalue *kv, const char *s) {
 	int i;
 	for (i = 0; kv[i].value; i++) {
 		if (0 == strcmp(kv[i].value, s)) return kv[i].key;

src/keyvalue.h

@@ -65,7 +65,7 @@ typedef enum { HTTP_VERSION_UNSET = -1, HTTP_VERSION_1_0, HTTP_VERSION_1_1 } htt
 typedef struct {
 	int key;
 
-	char *value;
+	const char *value;
 } keyvalue;
 
 typedef struct {
@@ -90,8 +90,8 @@ const char *get_http_status_body_name(int i);
 int get_http_version_key(const char *s);
 http_method_t get_http_method_key(const char *s);
 
-const char *keyvalue_get_value(keyvalue *kv, int k);
-int keyvalue_get_key(keyvalue *kv, const char *s);
+const char *keyvalue_get_value(const keyvalue *kv, int k);
+int keyvalue_get_key(const keyvalue *kv, const char *s);
 
 pcre_keyvalue_buffer *pcre_keyvalue_buffer_init(void);
 int pcre_keyvalue_buffer_append(struct server *srv, pcre_keyvalue_buffer *kvb, const char *key, const char *value);

src/server.c

@@ -99,10 +99,10 @@ static volatile siginfo_t last_sigterm_info;
 static volatile siginfo_t last_sighup_info;
 
 static void sigaction_handler(int sig, siginfo_t *si, void *context) {
-	static siginfo_t empty_siginfo;
+	static const siginfo_t empty_siginfo;
 	UNUSED(context);
 
-	if (!si) si = &empty_siginfo;
+	if (!si) *(const siginfo_t **)&si = &empty_siginfo;
 
 	switch (sig) {
 	case SIGTERM: