From e629d62a387549cee7242d422028926f11ea47e7 Mon Sep 17 00:00:00 2001
From: Donald Buczek <buczek@molgen.mpg.de>
Date: Wed, 15 Apr 2020 15:25:02 +0200
Subject: [PATCH] Add xmalloc.h

Add header file for the quasi-standard [1] xmalloc call.

The current approach implemented in mx_util is to wait and retry on
ENOMEM malloc failure. However, this overhead doesn't seem to be
justified, because it is difficult to imagine a case, where a malloc
would fail with ENOMEM at one time and a retry would succeed.

[1] https://www.gnu.org/software/libc/manual/html_node/Malloc-Examples.html
---
 xmalloc.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 xmalloc.h

diff --git a/xmalloc.h b/xmalloc.h
new file mode 100644
index 00000000..23705bdd
--- /dev/null
+++ b/xmalloc.h
@@ -0,0 +1,33 @@
+#ifndef _XMALLOC_H
+#define _XMALLOC_H 1
+
+#include <stdio.h>
+#include <stdlib.h>
+
+__attribute__ ((noreturn, unused)) static void out_of_memory() {
+    fprintf(stderr,"out of memory\n");
+    abort();
+}
+
+__attribute__ ((unused)) static void *xmalloc(size_t size) {
+    void *ptr = malloc(size);
+    if (ptr == NULL)
+        out_of_memory();
+    return(ptr);
+}
+
+__attribute__ ((unused)) static void *xrealloc(void *ptr, size_t size) {
+    void *outptr = realloc(ptr, size);
+    if (outptr == NULL)
+        out_of_memory();
+    return(outptr);
+}
+
+__attribute__ ((unused)) static char *xstrndup(const char *s, size_t n) {
+    char *ptr = strndup(s, n);
+    if (ptr == NULL)
+        out_of_memory();
+    return(ptr);
+}
+
+#endif