rename __simple_malloc.c to lite_malloc.c - yes this affects behavior!

[musl] / src / malloc / lite_malloc.c

diff --git a/src/malloc/lite_malloc.c b/src/malloc/lite_malloc.c
new file mode 100644 (file)
index 0000000..c829390
--- /dev/null
+++ b/src/malloc/lite_malloc.c
@@ -0,0 +1,46 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include <errno.h>
+#include "libc.h"
+
+uintptr_t __brk(uintptr_t);
+
+#define ALIGN 16
+
+void *__simple_malloc(size_t n)
+{
+       static uintptr_t cur, brk;
+       uintptr_t base, new;
+       static int lock;
+       size_t align=1;
+
+       if (!n) n++;
+       if (n > SIZE_MAX/2) goto toobig;
+
+       while (align<n && align<ALIGN)
+               align += align;
+       n = n + align - 1 & -align;
+
+       LOCK(&lock);
+       if (!cur) cur = brk = __brk(0)+16;
+       base = cur + align-1 & -align;
+       if (n > SIZE_MAX - PAGE_SIZE - base) goto fail;
+       if (base+n > brk) {
+               new = base+n + PAGE_SIZE-1 & -PAGE_SIZE;
+               if (__brk(new) != new) goto fail;
+               brk = new;
+       }
+       cur = base+n;
+       UNLOCK(&lock);
+
+       return (void *)base;
+
+fail:
+       UNLOCK(&lock);
+toobig:
+       errno = ENOMEM;
+       return 0;
+}
+
+weak_alias(__simple_malloc, malloc);