change jl_get_field_offset to test validity of and return the specifi…

…ed field offset
JuliaLang · Jan 21, 2016 · 30a44c9 · yuyichao · Jan 22, 2016 · vtjnash
1 parent 47c26dc
commit 30a44c9
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/sys.c b/src/sys.c
@@ -631,9 +631,9 @@ JL_DLLEXPORT long jl_SC_CLK_TCK(void)
 
 JL_DLLEXPORT size_t jl_get_field_offset(jl_datatype_t *ty, int field)
 {
-    if (field > jl_datatype_nfields(ty))
+    if (field > jl_datatype_nfields(ty) || field < 1)
         jl_error("This type does not have that many fields");
-    return jl_field_offset(ty, field);
+    return jl_field_offset(ty, field-1);
 }
 
 JL_DLLEXPORT size_t jl_get_alignment(jl_datatype_t *ty)