timespec_str: add "const" to input argument

1 files changed, 1 insertions, 1 deletions

diff --git a/gpsutils.c b/gpsutils.c
index 7184566a..d4002bdd 100644
--- a/gpsutils.c
+++ b/gpsutils.c
@@ -502,7 +502,7 @@ double earth_distance(double lat1, double lon1, double lat2, double lon2)
  * So 21 digits like this: "-2147483647.123456789"
  *
 */
-int timespec_str(struct timespec *ts, /*@out@*/char *buf, int buf_size)
+int timespec_str(const struct timespec *ts, /*@out@*/char *buf, int buf_size)
 {
     int ret;
     char sign = ' ';