1 files changed, 99 insertions, 0 deletions
diff --git a/src/basic/syslog-util.c b/src/basic/syslog-util.c
new file mode 100644
index 0000000..fe12948
--- /dev/null
+++ b/src/basic/syslog-util.c
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <string.h>
+#include <syslog.h>
+
+#include "hexdecoct.h"
+#include "macro.h"
+#include "string-table.h"
+#include "syslog-util.h"
+
+int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
+        int a = 0, b = 0, c = 0;
+        const char *end;
+        size_t k;
+
+        assert(p);
+        assert(*p);
+        assert(priority);
+
+        if ((*p)[0] != '<')
+                return 0;
+
+        end = strchr(*p, '>');
+        if (!end)
+                return 0;
+
+        k = end - *p;
+        assert(k > 0);
+
+        if (k == 2)
+                c = undecchar((*p)[1]);
+        else if (k == 3) {
+                b = undecchar((*p)[1]);
+                c = undecchar((*p)[2]);
+        } else if (k == 4) {
+                a = undecchar((*p)[1]);
+                b = undecchar((*p)[2]);
+                c = undecchar((*p)[3]);
+        } else
+                return 0;
+
+        if (a < 0 || b < 0 || c < 0 ||
+            (!with_facility && (a || b || c > 7)))
+                return 0;
+
+        if (with_facility)
+                *priority = a*100 + b*10 + c;
+        else
+                *priority = (*priority & LOG_FACMASK) | c;
+
+        *p += k + 1;
+        return 1;
+}
+
+static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
+        [LOG_FAC(LOG_KERN)] = "kern",
+        [LOG_FAC(LOG_USER)] = "user",
+        [LOG_FAC(LOG_MAIL)] = "mail",
+        [LOG_FAC(LOG_DAEMON)] = "daemon",
+        [LOG_FAC(LOG_AUTH)] = "auth",
+        [LOG_FAC(LOG_SYSLOG)] = "syslog",
+        [LOG_FAC(LOG_LPR)] = "lpr",
+        [LOG_FAC(LOG_NEWS)] = "news",
+        [LOG_FAC(LOG_UUCP)] = "uucp",
+        [LOG_FAC(LOG_CRON)] = "cron",
+        [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
+        [LOG_FAC(LOG_FTP)] = "ftp",
+        [LOG_FAC(LOG_LOCAL0)] = "local0",
+        [LOG_FAC(LOG_LOCAL1)] = "local1",
+        [LOG_FAC(LOG_LOCAL2)] = "local2",
+        [LOG_FAC(LOG_LOCAL3)] = "local3",
+        [LOG_FAC(LOG_LOCAL4)] = "local4",
+        [LOG_FAC(LOG_LOCAL5)] = "local5",
+        [LOG_FAC(LOG_LOCAL6)] = "local6",
+        [LOG_FAC(LOG_LOCAL7)] = "local7"
+};
+
+DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0));
+
+bool log_facility_unshifted_is_valid(int facility) {
+        return facility >= 0 && facility <= LOG_FAC(~0);
+}
+
+static const char *const log_level_table[] = {
+        [LOG_EMERG] = "emerg",
+        [LOG_ALERT] = "alert",
+        [LOG_CRIT] = "crit",
+        [LOG_ERR] = "err",
+        [LOG_WARNING] = "warning",
+        [LOG_NOTICE] = "notice",
+        [LOG_INFO] = "info",
+        [LOG_DEBUG] = "debug"
+};
+
+DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG);
+
+bool log_level_is_valid(int level) {
+        return level >= 0 && level <= LOG_DEBUG;
+}