src/poptalloca.h

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