rcx

commit 793139462e5134659ff54b99af7116be2e6e4dfc
parent d3d88235076197305a01e6460f43ea302b8809d1
Author: Robert Russell <robertrussell.72001@gmail.com>
Date:   Thu,  2 Feb 2023 19:52:09 -0800

Make sure non-e allocators set errno to ENOMEM

Apparently, malloc, calloc, and realloc are not required to touch
errno, so we must do it ourselves.

Diffstat:
M
inc/rcx/alloc.h
 | 
3
++-
M
src/alloc.c
 | 
21
+++++++++++++++------

2 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/inc/rcx/alloc.h b/inc/rcx/alloc.h
@@ -7,7 +7,8 @@
  *   re-  =>  realloc-style allocator
  *   -n   =>  array allocator (with overflow check)
  *   -z   =>  new memory initialized to 0.
- * All these allocators are interoperable with the stdlib allocators. */
+ * All these allocators are interoperable with the stdlib allocators. The
+ * non-e variants all set errno to ENOMEM on failure. */
 void *r_alloc(usize size); /* aka malloc */
 void *r_allocz(usize size);
 void *r_allocn(usize len, usize size);
diff --git a/src/alloc.c b/src/alloc.c
@@ -10,12 +10,16 @@
 
 void *
 r_alloc(usize size) {
-	return malloc(size);
+	void *p = malloc(size);
+	if (!p) errno = ENOMEM;
+	return p;
 }
 
 void *
 r_allocz(usize size) {
-	return calloc(1, size);
+	void *p = calloc(1, size);
+	if (!p) errno = ENOMEM;
+	return p;
 }
 
 void *
@@ -29,14 +33,19 @@ r_allocn(usize len, usize size) {
 
 void *
 r_allocnz(usize len, usize size) {
-	return calloc(len, size);
+	void *p = calloc(len, size);
+	if (!p) errno = ENOMEM;
+	return p;
 }
 
 int
 r_realloc(void *p, usize size) {
-	void *q = realloc(*(void**)p, size);
-	if (!q) return -1;
-	*(void**)p = q;
+	void *q = realloc(*(void **)p, size);
+	if (!q) {
+		errno = ENOMEM;
+		return -1;
+	}
+	*(void **)p = q;
 	return 0;
 }