93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/* stkmem.h
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*
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* $Id$
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*
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* Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
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* Copyright 2002, 2003 Sam Hocevar <sam@zoy.org>, Paris
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*
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* This software was derived from Elk 1.2, which was Copyright 1987, 1988,
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* 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
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* by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
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* between TELES and Nixdorf Microprocessor Engineering, Berlin).
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*
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* Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
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* owners or individual owners of copyright in this software, grant to any
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* person or company a worldwide, royalty free, license to
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*
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* i) copy this software,
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* ii) prepare derivative works based on this software,
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* iii) distribute copies of this software or derivative works,
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* iv) perform this software, or
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* v) display this software,
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*
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* provided that this notice is not removed and that neither Oliver Laumann
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* nor Teles nor Nixdorf are deemed to have made any representations as to
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* the suitability of this software for any purpose nor are held responsible
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* for any defects of this software.
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*
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* THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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*/
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#ifdef USE_ALLOCA
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#ifdef HAVE_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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