1 files changed, 95 insertions, 0 deletions
diff --git a/bin/cash/error.h b/bin/cash/error.h
new file mode 100644
index 00000000..8efd5b38
--- /dev/null
+++ b/bin/cash/error.h
@@ -0,0 +1,95 @@
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)error.h	8.2 (Berkeley) 5/4/95
+ * $FreeBSD: releng/12.0/bin/sh/error.h 319591 2017-06-04 21:58:02Z jilles $
+ */
+
+/*
+ * We enclose jmp_buf in a structure so that we can declare pointers to
+ * jump locations.  The global variable handler contains the location to
+ * jump to when an exception occurs, and the global variable exception
+ * contains a code identifying the exception.  To implement nested
+ * exception handlers, the user should save the value of handler on entry
+ * to an inner scope, set handler to point to a jmploc structure for the
+ * inner scope, and restore handler on exit from the scope.
+ */
+
+#include <setjmp.h>
+#include <signal.h>
+
+struct jmploc {
+	jmp_buf loc;
+};
+
+extern struct jmploc *handler;
+extern volatile sig_atomic_t exception;
+
+/* exceptions */
+#define EXINT 0		/* SIGINT received */
+#define EXERROR 1	/* a generic error */
+#define EXEXEC 2	/* command execution failed */
+#define EXEXIT 3	/* call exitshell(exitstatus) */
+
+
+/*
+ * These macros allow the user to suspend the handling of interrupt signals
+ * over a period of time.  This is similar to SIGHOLD to or sigblock, but
+ * much more efficient and portable.  (But hacking the kernel is so much
+ * more fun than worrying about efficiency and portability. :-))
+ */
+
+extern volatile sig_atomic_t suppressint;
+extern volatile sig_atomic_t intpending;
+
+#define INTOFF suppressint++
+#define INTON { if (--suppressint == 0 && intpending) onint(); }
+#define is_int_on() suppressint
+#define SETINTON(s) do { suppressint = (s); if (suppressint == 0 && intpending) onint(); } while (0)
+#define FORCEINTON {suppressint = 0; if (intpending) onint();}
+#define SET_PENDING_INT intpending = 1
+#define CLEAR_PENDING_INT intpending = 0
+#define int_pending() intpending
+
+void exraise(int) __dead2;
+void onint(void) __dead2;
+void warning(const char *, ...) __printflike(1, 2);
+void error(const char *, ...) __printf0like(1, 2) __dead2;
+void exerror(int, const char *, ...) __printf0like(2, 3) __dead2;
+
+
+/*
+ * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
+ * so we use _setjmp instead.
+ */
+
+#define setjmp(jmploc)	_setjmp(jmploc)
+#define longjmp(jmploc, val)	_longjmp(jmploc, val)