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diff --git a/src/log_level.cc b/src/log_level.cc
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+/**
+ * Copyright (c) 2018, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "log_level.hh"
+
+#include <ctype.h>
+
+#include "config.h"
+
+const char* level_names[LEVEL__MAX + 1] = {
+ "unknown",
+ "trace",
+ "debug5",
+ "debug4",
+ "debug3",
+ "debug2",
+ "debug",
+ "info",
+ "stats",
+ "notice",
+ "warning",
+ "error",
+ "critical",
+ "fatal",
+ "invalid",
+
+ nullptr,
+};
+
+log_level_t
+abbrev2level(const char* levelstr, ssize_t len)
+{
+ if (len == 0 || levelstr[0] == '\0') {
+ return LEVEL_UNKNOWN;
+ }
+
+ switch (toupper(levelstr[0])) {
+ case 'T':
+ return LEVEL_TRACE;
+ case 'D':
+ case 'V':
+ if (len > 1) {
+ switch (levelstr[len - 1]) {
+ case '2':
+ return LEVEL_DEBUG2;
+ case '3':
+ return LEVEL_DEBUG3;
+ case '4':
+ return LEVEL_DEBUG4;
+ case '5':
+ return LEVEL_DEBUG5;
+ }
+ }
+ return LEVEL_DEBUG;
+ case 'I':
+ if (len == 7 && toupper(levelstr[1]) == 'N'
+ && toupper(levelstr[2]) == 'V' && toupper(levelstr[3]) == 'A'
+ && toupper(levelstr[4]) == 'L' && toupper(levelstr[5]) == 'I'
+ && toupper(levelstr[6]) == 'D')
+ {
+ return LEVEL_INVALID;
+ }
+ return LEVEL_INFO;
+ case 'S':
+ return LEVEL_STATS;
+ case 'N':
+ return LEVEL_NOTICE;
+ case 'W':
+ return LEVEL_WARNING;
+ case 'E':
+ return LEVEL_ERROR;
+ case 'C':
+ return LEVEL_CRITICAL;
+ case 'F':
+ return LEVEL_FATAL;
+ default:
+ return LEVEL_UNKNOWN;
+ }
+}
+
+int
+levelcmp(const char* l1, ssize_t l1_len, const char* l2, ssize_t l2_len)
+{
+ return abbrev2level(l1, l1_len) - abbrev2level(l2, l2_len);
+}