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Permission to use, copy, modify, distribute, and sell this software and its

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documentation for any purpose is hereby granted without fee, provided that

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the above copyright notice appear in all copies and that both that

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documentation.

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The above copyright notice and this permission notice shall be

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included in all copies or substantial portions of the Software.

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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR

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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

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OTHER DEALINGS IN THE SOFTWARE.

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Except as contained in this notice, the name of The Open Group shall

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not be used in advertising or otherwise to promote the sale, use or

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other dealings in this Software without prior written authorization

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from The Open Group.

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* The purpose of this header is to define the macros ALLOCATE_LOCAL and

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* DEALLOCATE_LOCAL appropriately for the platform being compiled on.

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* These macros are used to make fast, function-local memory allocations.

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* Their characteristics are as follows:

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* void *ALLOCATE_LOCAL(size_t size)

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* Returns a pointer to size bytes of memory, or NULL if the allocation

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* failed. The memory must be freed with DEALLOCATE_LOCAL before the

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* function that made the allocation returns. You should not ask for

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* large blocks of memory with this function, since on many platforms

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* the memory comes from the stack, which may have limited size.

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* void DEALLOCATE_LOCAL(void *)

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* Frees the memory allocated by ALLOCATE_LOCAL. Omission of this

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* step may be harmless on some platforms, but will result in

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* memory leaks or worse on others.

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* Before including this file, you should define two macros,

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* ALLOCATE_LOCAL_FALLBACK and DEALLOCATE_LOCAL_FALLBACK, that have the

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* same characteristics as ALLOCATE_LOCAL and DEALLOCATE_LOCAL. The

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* header uses the fallbacks if it doesn't know a "better" way to define

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* ALLOCATE_LOCAL and DEALLOCATE_LOCAL. Typical usage would be:

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* #define ALLOCATE_LOCAL_FALLBACK(_size) malloc(_size)

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* #define DEALLOCATE_LOCAL_FALLBACK(_ptr) free(_ptr)

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* #include "Xalloca.h"

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#ifndef XALLOCA_H

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#define XALLOCA_H 1

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#ifndef INCLUDE_ALLOCA_H

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/* Need to add more here to match Imake *.cf's */

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# if defined(HAVE_ALLOCA_H) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)

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# define INCLUDE_ALLOCA_H

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# endif

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#endif

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#ifdef INCLUDE_ALLOCA_H

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# include <alloca.h>

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#endif

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#ifndef NO_ALLOCA

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* os-dependent definition of local allocation and deallocation

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* If you want something other than (DE)ALLOCATE_LOCAL_FALLBACK

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* for ALLOCATE/DEALLOCATE_LOCAL then you add that in here.

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# ifdef __GNUC__

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# ifndef alloca

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# define alloca __builtin_alloca

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# endif /* !alloca */

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# define ALLOCATE_LOCAL(size) alloca((size_t)(size))

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# else /* ! __GNUC__ */

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* warning: old mips alloca (pre 2.10) is unusable, new one is built in

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* Test is easy, the new one is named __builtin_alloca and comes

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* from alloca.h which #defines alloca.

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# if defined(__sun) || defined(alloca)

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* Some System V boxes extract alloca.o from /lib/libPW.a; if you

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* decide that you don't want to use alloca, you might want to fix it here.

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/* alloca might be a macro taking one arg (hi, Sun!), so give it one. */

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# if !defined(__cplusplus)

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# define __Xnullarg /* as nothing */

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extern void *alloca(__Xnullarg);

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# endif

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# define ALLOCATE_LOCAL(size) alloca((size_t)(size))

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# endif /* who does alloca */

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# endif /* __GNUC__ */

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#endif /* NO_ALLOCA */

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#if !defined(ALLOCATE_LOCAL)

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# if defined(ALLOCATE_LOCAL_FALLBACK) && defined(DEALLOCATE_LOCAL_FALLBACK)

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# define ALLOCATE_LOCAL(_size) ALLOCATE_LOCAL_FALLBACK(_size)

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# define DEALLOCATE_LOCAL(_ptr) DEALLOCATE_LOCAL_FALLBACK(_ptr)

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# else /* no fallbacks supplied; error */

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# define ALLOCATE_LOCAL(_size) ALLOCATE_LOCAL_FALLBACK undefined!

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# define DEALLOCATE_LOCAL(_ptr) DEALLOCATE_LOCAL_FALLBACK undefined!

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# endif /* defined(ALLOCATE_LOCAL_FALLBACK && DEALLOCATE_LOCAL_FALLBACK) */

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#else

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# if !defined(DEALLOCATE_LOCAL)

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# define DEALLOCATE_LOCAL(_ptr) do {} while(0)

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# endif

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#endif /* defined(ALLOCATE_LOCAL) */

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#endif /* XALLOCA_H */

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