conf: support ! to negate the match

So that you can do "application.name" = "!pw-cat" to match anything
that is not pw-cat and "application.name" = "!~pw-cat$".

Fixes #3460

src/daemon/jack.conf.in

@@ -95,7 +95,7 @@ jack.properties = {
 jack.rules = [
     {   matches = [
             {
-                # all keys must match the value. ~ starts regex.
+                # all keys must match the value. ! negates. ~ starts regex.
                 #client.name                = "Carla"
                 #application.process.binary = "jack_simple_client"
                 #application.name           = "~jack_simple_client.*"

src/daemon/pipewire-pulse.conf.in

@@ -116,7 +116,7 @@ pulse.rules = [
     {
         matches = [
             {
-                # all keys must match the value. ~ starts regex.
+                # all keys must match the value. ! negates. ~ starts regex.
                 #client.name                = "Firefox"
                 #application.process.binary = "teams"
                 #application.name           = "~speech-dispatcher.*"

src/modules/module-combine-stream.c

@@ -93,7 +93,7 @@
  *                     # any of the items in matches needs to match, if one does,
  *                     # actions are emited.
  *                     {
- *                         # all keys must match the value. ~ in value starts regex.
+ *                         # all keys must match the value. ! negates. ~ starts regex.
  *                         #node.name = "~alsa_input.*"
  *                         media.class = "Audio/Sink"
  *                     }

src/modules/module-rtp-sap.c

@@ -75,7 +75,7 @@
  *             {   matches = [
  *                     # any of the items in matches needs to match, if one does,
  *                     # actions are emited.
- *                     {   # all keys must match the value. ~ in value starts regex.
+ *                     {   # all keys must match the value. ! negates. ~ starts regex.
  *                         #rtp.origin = "wim 3883629975 0 IN IP4 0.0.0.0"
  *                         #rtp.payload = "127"
  *                         #rtp.fmt = "L16/48000/2"
@@ -91,7 +91,7 @@
  *                 }
  *             }
  *             {   matches = [
- *                     {   # all keys must match the value. ~ in value starts regex.
+ *                     {   # all keys must match the value. ! negates. ~ starts regex.
  *                         #rtp.origin = "wim 3883629975 0 IN IP4 0.0.0.0"
  *                         #rtp.payload = "127"
  *                         #rtp.fmt = "L16/48000/2"

src/pipewire/conf.c

@@ -586,6 +586,7 @@ static int load_module(struct pw_context *context, const char *key, const char *
 /*
  * {
  *     # all keys must match the value. ~ in value starts regex.
+ *     # ! as the first char of the value negates the match
  *     <key> = <value>
  *     ...
  * }
@@ -598,7 +599,7 @@ static bool find_match(struct spa_json *arr, const struct spa_dict *props)
 		char key[256], val[1024];
 		const char *str, *value;
 		int match = 0, fail = 0;
-		int len;
+		int len, skip = 0;
 
 		while (spa_json_get_string(&it[0], key, sizeof(key)) > 0) {
 			bool success = false;
@@ -615,23 +616,28 @@ static bool find_match(struct spa_json *arr, const struct spa_dict *props)
 					continue;
 				value = val;
 				len = strlen(val);
+				if (len > 0 && value[0] == '!') {
+					success = !success;
+					skip++;
+				}
 			}
 			if (str != NULL) {
-				if (value[0] == '~') {
+				if (value[skip] == '~') {
 					regex_t preg;
 					int res;
-					if ((res = regcomp(&preg, value+1, REG_EXTENDED | REG_NOSUB)) != 0) {
+					skip++;
+					if ((res = regcomp(&preg, value+skip, REG_EXTENDED | REG_NOSUB)) != 0) {
 						char errbuf[1024];
 						regerror(res, &preg, errbuf, sizeof(errbuf));
-						pw_log_warn("invalid regex %s: %s", value+1, errbuf);
+						pw_log_warn("invalid regex %s: %s", value+skip, errbuf);
 					} else {
 						if (regexec(&preg, str, 0, NULL, 0) == 0)
-							success = true;
+							success = !success;
 						regfree(&preg);
 					}
-				} else if (strncmp(str, value, len) == 0 &&
+				} else if (strncmp(str, value+skip, len-skip) == 0 &&
-				    strlen(str) == (size_t)len) {
+				    strlen(str) == (size_t)(len-skip)) {
-					success = true;
+					success = !success;
 				}
 			}
 			if (success) {
@@ -639,6 +645,7 @@ static bool find_match(struct spa_json *arr, const struct spa_dict *props)
 				pw_log_debug("'%s' match '%s' < > '%.*s'", key, str, len, value);
 			}
 			else {
+				pw_log_debug("'%s' fail '%s' < > '%.*s'", key, str, len, value);
 				fail++;
 				break;
 			}
@@ -1080,7 +1087,7 @@ int pw_conf_load_conf_for_context(struct pw_properties *props, struct pw_propert
  *             # any of the items in matches needs to match, if one does,
  *             # actions are emited.
  *             {
- *                 # all keys must match the value. ~ in value starts regex.
+ *                 # all keys must match the value. ! negates. ~ starts regex.
  *                 <key> = <value>
  *                 ...
  *             }