1 files changed, 57 insertions, 0 deletions
diff --git a/src/fuzz/fuzz-calendarspec.c b/src/fuzz/fuzz-calendarspec.c
new file mode 100644
index 0000000..b31a3f2
--- /dev/null
+++ b/src/fuzz/fuzz-calendarspec.c
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "calendarspec.h"
+#include "fd-util.h"
+#include "fuzz.h"
+#include "string-util.h"
+#include "time-util.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+        _cleanup_(calendar_spec_freep) CalendarSpec *cspec = NULL;
+        _cleanup_free_ char *str = NULL;
+        int r;
+
+        fuzz_setup_logging();
+
+        assert_se(str = memdup_suffix0(data, size));
+
+        size_t l1 = strlen(str);
+        const char* usecs = l1 < size ? str + l1 + 1 : "";
+
+        r = calendar_spec_from_string(str, &cspec);
+        if (r < 0) {
+                log_debug_errno(r, "Failed to parse \"%s\": %m", str);
+                return 0;
+        }
+
+        _cleanup_free_ char *p = NULL;
+        assert_se(calendar_spec_valid(cspec));
+        assert_se(calendar_spec_to_string(cspec, &p) == 0);
+        assert(p);
+
+        log_debug("spec: %s → %s", str, p);
+
+        _cleanup_(calendar_spec_freep) CalendarSpec *cspec2 = NULL;
+        assert_se(calendar_spec_from_string(p, &cspec2) >= 0);
+        assert_se(calendar_spec_valid(cspec2));
+
+        usec_t usec = 0;
+        (void) parse_time(usecs, &usec, 1);
+
+        /* If timezone is set, calendar_spec_next_usec() would fork, bleh :(
+         * Let's not try that. */
+        cspec->timezone = mfree(cspec->timezone);
+
+        log_debug("00: %s", strna(FORMAT_TIMESTAMP(usec)));
+        for (unsigned i = 1; i <= 20; i++) {
+                r = calendar_spec_next_usec(cspec, usec, &usec);
+                if (r < 0) {
+                        log_debug_errno(r, "%02u: %m", i);
+                        break;
+                }
+                log_debug("%02u: %s", i, FORMAT_TIMESTAMP(usec));
+        }
+
+        return 0;
+}