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-rw-r--r--doc/info/chap/introduction.texinfo6
-rw-r--r--include/malloc.h21
-rw-r--r--include/slibc/portability.h6
-rw-r--r--src/malloc.c25
4 files changed, 58 insertions, 0 deletions
diff --git a/doc/info/chap/introduction.texinfo b/doc/info/chap/introduction.texinfo
index 92f6273..ba08dbe 100644
--- a/doc/info/chap/introduction.texinfo
+++ b/doc/info/chap/introduction.texinfo
@@ -398,6 +398,12 @@ or @sc{SVID}@. To override this, define
@code{_GNU_SOURCE} does not automatically
define @code{_BSD_SOURCE} or @code{_SVID_SOURCE}@.
+@item _PLAN9_SOURCE
+@cpindex Plan 9 from Bell Labs
+@lvindex _PLAN9_SOURCE
+Enables extensions from Plan 9 from Bell Labs
+C standard library.
+
@end table
@c TODO: _LARGEFILE_SUPPORT
@c TODO: _LARGEFILE64_SUPPORT
diff --git a/include/malloc.h b/include/malloc.h
index 66adcbd..f4a910a 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -73,6 +73,27 @@ void* malloc(size_t)
void* calloc(size_t, size_t)
__GCC_ONLY(__attribute__((__malloc__, __warn_unused_result__)));
+#if defined(__PLAN9_SOURCE)
+/**
+ * Variant of `malloc` that conditionally clears the allocation with zeroes.
+ *
+ * This is a Plan 9 from Bell Labs extension.
+ *
+ * @param size The size of the allocation.
+ * @param clear Clear the allocation unless this value is zero.
+ * @return Pointer to the beginning of the new allocation.
+ * If `size` is zero, this function will either return
+ * `NULL` (that is what this implement does) or return
+ * a unique pointer that can later be freed with `free`.
+ * `NULL` is returned on error, and `errno` is set to
+ * indicate the error.
+ *
+ * @throws ENOMEM The process cannot allocate more memory.
+ */
+void* mallocz(size_t, int)
+ __GCC_ONLY(__attribute__((__malloc__, __warn_unused_result__)));
+#endif
+
#if !defined(__PORTABLE)
/**
* Variant of `malloc` that clears the allocation with zeroes.
diff --git a/include/slibc/portability.h b/include/slibc/portability.h
index 5eae353..5ccb9fb 100644
--- a/include/slibc/portability.h
+++ b/include/slibc/portability.h
@@ -56,6 +56,9 @@
#ifdef __SUS_SOURCE
# undef __SUS_SOURCE
#endif
+#ifdef __PLAN9_SOURCE
+# undef __PLAN9_SOURCE
+#endif
#ifdef __GNU_SOURCE
# undef __GNU_SOURCE
#endif
@@ -94,6 +97,9 @@
* is not defined.
*/
#if !defined(__PORTABLE)
+# if defined(_PLAN9_SOURCE)
+# define __PLAN9_SOURCE _PLAN9_SOURCE
+# endif
# if defined(_GNU_SOURCE)
# define __GNU_SOURCE _GNU_SOURCE
# endif
diff --git a/src/malloc.c b/src/malloc.c
index cd22ccd..864a8f5 100644
--- a/src/malloc.c
+++ b/src/malloc.c
@@ -122,6 +122,31 @@ void* calloc(size_t elem_count, size_t elem_size)
/**
+ * Variant of `malloc` that conditionally clears the allocation with zeroes.
+ *
+ * This is a Plan 9 from Bell Labs extension.
+ *
+ * @param size The size of the allocation.
+ * @param clear Clear the allocation unless this value is zero.
+ * @return Pointer to the beginning of the new allocation.
+ * If `size` is zero, this function will either return
+ * `NULL` (that is what this implement does) or return
+ * a unique pointer that can later be freed with `free`.
+ * `NULL` is returned on error, and `errno` is set to
+ * indicate the error.
+ *
+ * @throws ENOMEM The process cannot allocate more memory.
+ */
+void* mallocz(size_t size, int clear)
+{
+ void* ptr = memalign(sizeof(max_align_t), size);
+ if ((ptr != NULL) && clear)
+ explicit_bzero(ptr, size);
+ return ptr;
+}
+
+
+/**
* Variant of `malloc` that clears the allocation with zeroes.
*
* `zalloc(n)` is equivalent to `calloc(1, n)`, or equivalently,