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author | Mark H Weaver <mhw@netris.org> | 2019-04-01 22:11:35 -0400 |
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committer | Andy Wingo <wingo@pobox.com> | 2019-05-23 17:40:08 +0200 |
commit | 980d8265c2dc35d6e02e540c9041cbf0975dfede (patch) | |
tree | 067f18effb6989e30fa872310ff3bddd920a8ac8 /libguile/intrinsics.h | |
parent | b38d9a1527a9d796034bf721c9a266d261db5ad0 (diff) | |
download | guile-980d8265c2dc35d6e02e540c9041cbf0975dfede.tar.gz |
Avoid passing NULL to 'memcpy' and 'memcmp'.
Reported by Jeffrey Walton <noloader@gmail.com> in
<https://lists.gnu.org/archive/html/guile-devel/2019-03/msg00001.html>.
Note that C11 section 7.1.4 (Use of library functions) states that:
"unless explicitly stated otherwise in the detailed descriptions [of
library functions] that follow: If an argument to a function has an
invalid value (such as ... a null pointer ...) ..., the behavior is
undefined." Note that 'strxfrm' is an example of a standard C function
that explicitly states otherwise, allowing NULL to be passed in the
first argument if the size argument is zero, but no similar allowance is
specified for 'memcpy' or 'memcmp'.
* libguile/bytevectors.c (scm_uniform_array_to_bytevector): Call memcpy
only if 'byte_len' is non-zero.
* libguile/srfi-14.c (charsets_equal): Call memcmp only if the number of
ranges is non-zero.
* libguile/stime.c (setzone): Pass 1-character buffer to
'scm_to_locale_stringbuf', instead of NULL.
* libguile/strings.c (scm_to_locale_stringbuf): Call memcpy only if the
number of bytes to copy is non-zero.
Diffstat (limited to 'libguile/intrinsics.h')
0 files changed, 0 insertions, 0 deletions