/* Copyright (C) 1991-2026 Free Software Foundation, Inc.   This file based on putenv.c in the GNU C Library.    The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Library General Public License as   published by the Free Software Foundation; either version 2 of the   License, or (at your option) any later version.    The GNU C Library is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   Library General Public License for more details.    You should have received a copy of the GNU Library General Public   License along with the GNU C Library; see the file COPYING.LIB.  If not,   write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,   Boston, MA 02110-1301, USA.  */ /* @deftypefn Supplemental int putenv (const char *@var{string}) Uses @code{setenv} or @code{unsetenv} to put @var{string} intothe environment or remove it.  If @var{string} is of the form@samp{name=value} the string is added; if no @samp{=} is present thename is unset/removed. @end deftypefn */ #if defined (_AIX) && !defined (__GNUC__) #pragma alloca#endif #if HAVE_CONFIG_H# include <config.h>#endif #include "ansidecl.h" #define putenv libiberty_putenv #if HAVE_STDLIB_H# include <stdlib.h>#endif#if HAVE_STRING_H# include <string.h>#endif #ifdef HAVE_ALLOCA_H# include <alloca.h>#else# ifndef alloca#  ifdef __GNUC__#   define alloca __builtin_alloca#  elseextern char *alloca ();#  endif /* __GNUC__ */# endif /* alloca */#endif /* HAVE_ALLOCA_H */ #undef putenv /* Below this point, it's verbatim code from the glibc-2.0 implementation */  /* Put STRING, which is of the form "NAME=VALUE", in the environment.  */intputenv (const char *string){  const char *const name_end = strchr (string, '=');   if (name_end)    {      char *name = (char *) alloca (name_end - string + 1);      memcpy (name, string, name_end - string);      name[name_end - string] = '\0';      return setenv (name, name_end + 1, 1);    }   unsetenv (string);  return 0;}