Import sources from 2011-03-30 iso image

1 files changed, 35 insertions, 0 deletions

diff --git a/sys/src/libc/9sys/sbrk.c b/sys/src/libc/9sys/sbrk.c
new file mode 100755
index 000000000..88b593e11
--- /dev/null
+++ b/sys/src/libc/9sys/sbrk.c
@@ -0,0 +1,35 @@
+#include <u.h>
+#include <libc.h>
+
+extern	char	end[];
+static	char	*bloc = { end };
+extern	int	brk_(void*);
+
+enum
+{
+	Round	= 7
+};
+
+int
+brk(void *p)
+{
+	uintptr bl;
+
+	bl = ((uintptr)p + Round) & ~Round;
+	if(brk_((void*)bl) < 0)
+		return -1;
+	bloc = (char*)bl;
+	return 0;
+}
+
+void*
+sbrk(ulong n)
+{
+	uintptr bl;
+
+	bl = ((uintptr)bloc + Round) & ~Round;
+	if(brk_((void*)(bl+n)) < 0)
+		return (void*)-1;
+	bloc = (char*)bl + n;
+	return (void*)bl;
+}