refactorHEADmastermain

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/logarithm.c b/lib/logarithm.c
index 7451976..9ca98a6 100755
--- a/lib/logarithm.c
+++ b/lib/logarithm.c
@@ -36,8 +36,8 @@ int ts_logarithm(
 {
 	TS_PROLOGUE( ts_logarithm_p );
 	if ( !c ) return -1;
-	fp_t b = ((ts_logarithm_params_t *)c)->b;
-	if (b == 0 || b == 1.0) return -1;
+	fp_t b = ((ts_logarithm_params_t const *)c)->b;
+	if (b <= 0 || b == 1.0 || isnan(b) || isinf(b)) return -1;
 
     b = _ts_reciprocal( log( b ) );