mailing list of musl libc
 help / color / mirror / code / Atom feed
* [musl] [PATCH v2] implement reallocarray(3)
@ 2020-07-22  0:50 Ariadne Conill
  0 siblings, 0 replies; only message in thread
From: Ariadne Conill @ 2020-07-22  0:50 UTC (permalink / raw)
  To: musl; +Cc: Ariadne Conill

reallocarray(3) is an extension introduced by OpenBSD, which
introduces calloc(3) overflow checking to realloc(3).

glibc 2.28 introduced support for this function behind _GNU_SOURCE,
while glibc 2.29 allows its usage in _DEFAULT_SOURCE, so I made it
available by default as well.
---
 include/stdlib.h          |  1 +
 src/malloc/reallocarray.c | 13 +++++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 src/malloc/reallocarray.c

diff --git a/include/stdlib.h b/include/stdlib.h
index 194c2033..b54a051f 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -145,6 +145,7 @@ int getloadavg(double *, int);
 int clearenv(void);
 #define WCOREDUMP(s) ((s) & 0x80)
 #define WIFCONTINUED(s) ((s) == 0xffff)
+void *reallocarray (void *, size_t, size_t);
 #endif
 
 #ifdef _GNU_SOURCE
diff --git a/src/malloc/reallocarray.c b/src/malloc/reallocarray.c
new file mode 100644
index 00000000..4a6ebe46
--- /dev/null
+++ b/src/malloc/reallocarray.c
@@ -0,0 +1,13 @@
+#define _BSD_SOURCE
+#include <errno.h>
+#include <stdlib.h>
+
+void *reallocarray(void *ptr, size_t m, size_t n)
+{
+	if (n && m > -1 / n) {
+		errno = ENOMEM;
+		return 0;
+	}
+
+	return realloc(ptr, m * n);
+}
-- 
2.27.0


^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2020-07-22  0:50 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-22  0:50 [musl] [PATCH v2] implement reallocarray(3) Ariadne Conill

Code repositories for project(s) associated with this public inbox

	https://git.vuxu.org/mirror/musl/

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).