Introduce chk_wmalloc function.

Two-fold benefit. Simplifies code which allocates wchar_t
arrays. Provides overflow check for the multiplication.

* lib.c (chk_wmalloc): New function.
(chk_strdup, mkstring, mkustring, upcase_str, downcase_str,
sub_str, cat_str, trim_str): Use chk_wmalloc.

* lib.h (chk_wmalloc): Declared.

* stream.c (make_string_output_stream): Use chk_wmalloc.

* utf8.c (utf8_dup_from_uc, utf8_dup_from): Likewise.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib.h b/lib.h
index b9fa99e5..41b8608b 100644
--- a/lib.h
+++ b/lib.h
@@ -535,6 +535,7 @@ mem_t *chk_calloc(size_t n, size_t size);
 mem_t *chk_realloc(mem_t *, size_t size);
 mem_t *chk_grow_vec(mem_t *old, size_t oldelems, size_t newelems,
                     size_t elsize);
+wchar_t *chk_wmalloc(size_t nwchar);
 wchar_t *chk_strdup(const wchar_t *str);
 char *chk_strdup_utf8(const char *str);
 val cons(val car, val cdr);