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libiconv 1.16

    1: /* Memory allocation on the stack.
    2:    Copyright (C) 1995, 1999, 2001-2007 Free Software Foundation, Inc.
    3: 
    4:    This program is free software: you can redistribute it and/or modify
    5:    it under the terms of the GNU General Public License as published by
    6:    the Free Software Foundation; either version 3 of the License, or
    7:    (at your option) any later version.
    8: 
    9:    This program is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12:    GNU General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU General Public License
   15:    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
   16: 
   17: /* When this file is included, it may be preceded only by preprocessor
   18:    declarations.  Thanks to AIX.  Therefore we include it right after
   19:    "config.h", not later.  */
   20: 
   21: /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
   22:    means there is a real alloca function.  */
   23: #ifndef _GL_ALLOCA_H
   24: #define _GL_ALLOCA_H
   25: 
   26: /* alloca(N) returns a pointer (void* or char*) to N bytes of memory
   27:    allocated on the stack, and which will last until the function returns.
   28:    Use of alloca should be avoided:
   29:      - inside arguments of function calls - undefined behaviour,
   30:      - in inline functions - the allocation may actually last until the
   31:        calling function returns,
   32:      - for huge N (say, N >= 65536) - you never know how large (or small)
   33:        the stack is, and when the stack cannot fulfill the memory allocation
   34:        request, the program just crashes.
   35:  */
   36: 
   37: #ifndef alloca
   38: # ifdef __GNUC__
   39: #   define alloca __builtin_alloca
   40: # else
   41: #  ifdef _MSC_VER
   42: #   include <malloc.h>
   43: #   define alloca _alloca
   44: #  else
   45: #   if HAVE_ALLOCA_H
   46: #    include <alloca.h>
   47: #   else
   48: #    ifdef _AIX
   49:  #pragma alloca
   50: #    else
   51: #     ifdef __hpux /* This section must match that of bison generated files. */
   52: #      ifdef __cplusplus
   53: extern "C" void *alloca (unsigned int);
   54: #      else /* not __cplusplus */
   55: extern void *alloca ();
   56: #      endif /* not __cplusplus */
   57: #     else /* not __hpux */
   58: #      ifndef alloca
   59: extern char *alloca ();
   60: #      endif
   61: #     endif /* __hpux */
   62: #    endif
   63: #   endif
   64: #  endif
   65: # endif
   66: #endif
   67: 
   68: #endif /* _GL_ALLOCA_H */