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Annotation of researchv9/cmd/cfront/CC/varargs.h, revision 1.1

1.1     ! root        1: 
        !             2: #ifndef va_start
        !             3: 
        !             4: /* 
        !             5:    Proper usage of this version of varargs is slightly different from
        !             6:    that found in C. Functions are declared
        !             7: 
        !             8:        foo(int arg ...) { va_list ap; ... va_start(ap,arg1) ; ...
        !             9: 
        !            10:    rather than
        !            11: 
        !            12:        foo(va_alist) va_dcl { va_list ap; ... va_start(ap);
        !            13: 
        !            14:    use of va_arg, and va_end remain the same.
        !            15: 
        !            16:    Arg does not have to be int, but it must be declared.  Hence
        !            17:    all calls of foo must have the same first type for their first
        !            18:    argument. (In the most common printf-like cases the first argument
        !            19:    is a char* format.)
        !            20:  */ 
        !            21: 
        !            22: typedef char *va_list;
        !            23: #define va_start(list,last) list = (char *) &last
        !            24: #define va_end(list)
        !            25: #ifdef u370
        !            26: #define va_arg(list, mode) ((mode *)(list = \
        !            27:        (char *) ((int)list + 2*sizeof(mode) - 1 & -sizeof(mode))))[-1]
        !            28: #else
        !            29: #define va_arg(list, mode) ((mode *)(list += sizeof(mode)))[-1]
        !            30: #endif
        !            31: 
        !            32: #endif 
        !            33: 
        !            34: 

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