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Annotation of 43BSD/contrib/xns/xnslib/except.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * except.h
        !             3:  *
        !             4:  * Definitions and macros for C exception mechanism
        !             5:  *
        !             6:  (c) Jeffrey Mogul     Stanford        18 February 1983
        !             7:  */
        !             8: 
        !             9: #include <setjmp.h>
        !            10: 
        !            11: typedef struct _Except_buf_x {
        !            12:        struct _Except_buf_x *Prev;     /* exception chain back-pointer */
        !            13:        jmp_buf Environ;                /* saved environment */
        !            14:        char *Message;                  /* Human-readable cause */
        !            15:        int Code;                       /* Exception code */
        !            16: } _Except_Buf;
        !            17: 
        !            18: extern _Except_Buf *_Except_Header;    /* global exception chain header */
        !            19: 
        !            20: /*
        !            21:  * "syntax":
        !            22:  *     DURING statement HANDLER statement END_HANDLER
        !            23:  */
        !            24: 
        !            25: #define        _E_RESTORE      _Except_Header = Exception.Prev
        !            26: 
        !            27: #define        DURING {_Except_Buf Exception;\
        !            28:                 Exception.Prev=_Except_Header;\
        !            29:                 _Except_Header= &Exception;\
        !            30:                 if (!setjmp(Exception.Environ)) {
        !            31: 
        !            32: #define        HANDLER _E_RESTORE;} else
        !            33: 
        !            34: #define        END_HANDLER }
        !            35: 
        !            36: #define        E_RETURN(x) {_E_RESTORE; return(x);}
        !            37: 
        !            38: #define        E_RETURN_VOID {_E_RESTORE; return;}
        !            39: 
        !            40: #define        RERAISE raise(Exception.Code, Exception.Message)
        !            41: 
        !            42: /*
        !            43:  * Exception modes (combined with ||):
        !            44:  */
        !            45: #define        EX_MODE_REPORT  1       /* report uncaught errors on stderr */
        !            46: #define        EX_MODE_ABORT   2       /* abort if uncaught error */
        !            47: 
        !            48: extern int ExceptMode;

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