a

kern/waserror.c

@@ -0,0 +1,27 @@
+#include "u.h"
+#include "lib.h"
+#include "dat.h"
+#include "fns.h"
+#include "error.h"
+
+Label*
+pwaserror(void)
+{
+	if(up->nerrlab == NERR)
+		panic("error stack overflow");
+	return &up->errlab[up->nerrlab++];
+}
+
+void
+nexterror(void)
+{
+	longjmp(up->errlab[--up->nerrlab].buf, 1);
+}
+
+void
+error(char *e)
+{
+	kstrcpy(up->errstr, e, ERRMAX);
+	setjmp(up->errlab[NERR-1].buf);
+	nexterror();
+}