63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
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#ifdef USE_ALLOCA
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#ifdef INCLUDE_ALLOCA_H
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# include <alloca.h>
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#endif
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/* #pragma must be indented to prevent some C-compilers from complaining
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* about "undefined control".
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*/
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#ifdef PRAGMA_ALLOCA
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#pragma alloca
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#endif
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#if !defined(alloca) && !defined(__GNUC__)
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C_LINKAGE_BEGIN
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extern char *alloca P_((int));
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C_LINKAGE_END
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#endif
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/* MIPS cc under Ultrix 4.2 requires argument to alloca() to be
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* parenthesized if it's a compound expression.
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*
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* Declare variable in Alloca_Begin and reference it in Alloca to make
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* sure users won't forget Alloca_Begin when using macros like
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* Get_String_Stack().
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*/
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#define Alloca_Begin int _Check_Alloca_Begin
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#define Alloca(ret,type,size) (_Check_Alloca_Begin = 0,\
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(ret) = (type)alloca((size)))
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#define Alloca_End
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#else /* USE_ALLOCA */
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extern MEM_NODE *Mem_List;
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extern char *Mem_Alloc P_((unsigned));
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#define Alloca_Begin MEM_NODE *_mem_first = 0
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#define Alloca(ret,type,size) {\
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register MEM_NODE *_p;\
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_p = (MEM_NODE*)Mem_Alloc ((unsigned)(size) + sizeof(MEM_NODE));\
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_p->next = Mem_List;\
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_p->len = (size);\
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_p->refcnt = 1;\
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Mem_List = _p;\
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if (_mem_first == 0) _mem_first = _p;\
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(ret) = (type)(_p+1);\
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}
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#define Alloca_End {\
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register MEM_NODE *_p, *_q;\
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if (_mem_first != 0) {\
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_p = Mem_List;\
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do {\
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_q = _p;\
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_p = _p->next;\
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if (--_q->refcnt == 0)\
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free ((char *)_q);\
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} while (_q != _mem_first);\
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Mem_List = _p;\
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}\
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}
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#endif
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