From b6a0813d21f00e3e98a39fee629a9b1d4a43809f Mon Sep 17 00:00:00 2001
From: Stas Sergeev <stsp@users.sourceforge.net>
Date: Wed, 23 Oct 2024 01:46:27 +0300
Subject: [PATCH] restore private setjmp functionality [#15]

---
 include/setjmp.h      | 81 +++++++++++++++++++++++++++++++++++++++++++
 include/sys/exceptn.h |  4 +--
 2 files changed, 83 insertions(+), 2 deletions(-)
 create mode 100644 include/setjmp.h

diff --git a/include/setjmp.h b/include/setjmp.h
new file mode 100644
index 00000000..62eb3cf5
--- /dev/null
+++ b/include/setjmp.h
@@ -0,0 +1,81 @@
+/* Copyright (C) 2012 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 2011 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 2003 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 2001 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 1999 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
+#ifndef __dj_include_setjmp_h_
+#define __dj_include_setjmp_h_
+
+#ifdef __cplusplus
+namespace std {
+  extern "C" {
+#endif
+
+#ifndef __dj_ENFORCE_ANSI_FREESTANDING
+
+typedef struct __jmp_buf {
+  void *buf[5];
+  volatile int rc;
+} jmp_buf[1];
+
+__attribute__((noreturn))
+static inline void longjmp(jmp_buf env, int val)
+{
+  env[0].rc = val;
+  __builtin_longjmp(env[0].buf, 1);
+}
+
+#define setjmp(env) ( \
+{ \
+  int _rc = __builtin_setjmp(env[0].buf); \
+  (_rc ? env[0].rc : 0); \
+})
+
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) \
+  || !defined(__STRICT_ANSI__) || defined(__cplusplus)
+
+#endif /* (__STDC_VERSION__ >= 199901L) || !__STRICT_ANSI__ */
+
+#ifndef __STRICT_ANSI__
+#if 0
+typedef jmp_buf sigjmp_buf;
+
+int	sigsetjmp(sigjmp_buf env, int savemask);
+void	siglongjmp(sigjmp_buf env, int val) __attribute__((__noreturn__));
+#endif
+#ifndef _POSIX_SOURCE
+
+#endif /* !_POSIX_SOURCE */
+#endif /* !__STRICT_ANSI__ */
+#endif /* !__dj_ENFORCE_ANSI_FREESTANDING */
+
+#ifndef __dj_ENFORCE_FUNCTION_CALLS
+#endif /* !__dj_ENFORCE_FUNCTION_CALLS */
+
+#ifdef __cplusplus
+  }
+}
+#endif
+
+#endif /* !__dj_include_setjmp_h_ */
+
+
+#if defined(__cplusplus) && !defined(__dj_ENFORCE_ANSI_FREESTANDING)
+
+using std::setjmp;
+
+#ifndef __dj_via_cplusplus_header_
+
+using std::longjmp;
+using std::jmp_buf;
+
+#ifndef __STRICT_ANSI__
+
+using std::sigjmp_buf;
+using std::sigsetjmp;
+using std::siglongjmp;
+
+#endif /* !__STRICT_ANSI__ */
+#endif /* !__dj_via_cplusplus_header_ */
+#endif /* __cplusplus && !__dj_ENFORCE_ANSI_FREESTANDING */
diff --git a/include/sys/exceptn.h b/include/sys/exceptn.h
index 25e58c4a..104d9a4e 100644
--- a/include/sys/exceptn.h
+++ b/include/sys/exceptn.h
@@ -25,7 +25,7 @@ extern "C" {
 #include <setjmp.h>
 #include <dpmi.h>
 
-struct __jmp_buf {
+struct _jmp_buf {
   ULONG32 __eax, __ebx, __ecx, __edx, __esi;
   ULONG32 __edi, __ebp, __esp, __eip, __eflags;
   unsigned short __cs, __ds, __es, __fs, __gs, __ss;
@@ -34,7 +34,7 @@ struct __jmp_buf {
   ULONG32 __exception_ptr; /* pointer to previous exception */
   unsigned char __fpu_state[108]; /* for future use */
 };
-EXTERN ASM_P(struct __jmp_buf, __djgpp_exception_state_ptr);	/* Must include setjmp.h first */
+EXTERN ASM_P(struct _jmp_buf, __djgpp_exception_state_ptr);	/* Must include setjmp.h first */
 #define __djgpp_exception_state (__djgpp_exception_state_ptr)
 
 EXTERN ASM(unsigned short, __djgpp_our_DS);