src/poptalloca.h

   1
   2 /** \file poptalloca.h
   3  *  \brief Header: definitions for alloca for popt
   4  *
   5  *  Definitions for alloca (mostly extracted from AC_FUNC_ALLOCA). According
   6  *  to the autoconf manual in dome versions of AIX the declaration of alloca
   7  *  has to precede everything else execept comments and prepocessor directives,
   8  *  i.e. including this file has to preceed anything else.
   9  *
  10  *  NOTE: alloca is redefined as malloc on systems which fail to support alloca.
  11  *  Don't include this header if you frequently use alloca in order to avoid an
  12  *  unlimited amount of memory leaks.
  13  *  popt uses alloca only during program startup, i.e. the memory leaks caused
  14  *  by this redefinition are limited.
  15  */
  16
  17 #ifndef MC_POPTALLOCA_H
  18 #define MC_POPTALLOCA_H
  19
  20 /* AIX requires this to be the first thing in the file.  */
  21 #ifdef __GNUC__
  22 #    define alloca __builtin_alloca
  23 #else
  24 #    ifdef _MSC_VER
  25 #        include <malloc.h>
  26 #        define alloca _alloca
  27 #    else
  28 #        if HAVE_ALLOCA_H
  29 #            include <alloca.h>
  30 #        else
  31 #            ifdef _AIX
  32 #pragma alloca
  33 #            else
  34 #                ifndef alloca /* predefined by HP cc +Olibcalls */
  35 char *alloca ();
  36 #                endif
  37 #            endif
  38 #        endif
  39 #    endif
  40 #endif
  41
  42 #ifndef HAVE_ALLOCA
  43 #    include <stdlib.h>
  44 #    if !defined(STDC_HEADERS) && defined(HAVE_MALLOC_H)
  45 #        include <malloc.h>
  46 #    endif
  47 #    define alloca malloc
  48 #endif
  49
  50 #endif