1 files changed, 110 insertions, 0 deletions
diff --git a/misc/putenv.c b/misc/putenv.c
new file mode 100644
index 000000000..ee3ccc04a
--- /dev/null
+++ b/misc/putenv.c
@@ -0,0 +1,110 @@
+/* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
+
+
+NOTE: The canonical source of this file is maintained with the GNU C Library.
+Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software Foundation,
+Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Define-away any (possibly conflicting) prototype of putenv.
+   Many systems omit the `const' attribute on the argument.  */
+#define putenv _sys_putenv
+
+#if defined (__GNU_LIBRARY__) || defined (HAVE_STDLIB_H)
+# include <stdlib.h>
+#endif
+#if defined (__GNU_LIBRARY__) || defined (HAVE_STRING_H)
+# include <string.h>
+#endif
+#if defined (__GNU_LIBRARY__) || defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#undef putenv
+
+#if !defined (__GNU_LIBRARY__) && !defined (HAVE_STRCHR)
+# define strchr index
+#endif
+#if !defined (__GNU_LIBRARY__) && !defined (HAVE_MEMCPY)
+# define memcpy(d,s,n) bcopy ((s), (d), (n))
+#endif
+
+#if HAVE_GNU_LD
+# define environ __environ
+#else
+extern char **environ;
+#endif
+
+
+/* Put STRING, which is of the form "NAME=VALUE", in the environment.  */
+int
+putenv (string)
+     const char *string;
+{
+  const char *const name_end = strchr (string, '=');
+  register size_t size;
+  register char **ep;
+
+  if (name_end == NULL)
+    {
+      /* Remove the variable from the environment.  */
+      size = strlen (string);
+      for (ep = environ; *ep != NULL; ++ep)
+	if (!strncmp (*ep, string, size) && (*ep)[size] == '=')
+	  {
+	    while (ep[1] != NULL)
+	      {
+		ep[0] = ep[1];
+		++ep;
+	      }
+	    *ep = NULL;
+	    return 0;
+	  }
+    }
+
+  size = 0;
+  for (ep = environ; *ep != NULL; ++ep)
+    if (!strncmp (*ep, string, name_end - string) &&
+	(*ep)[name_end - string] == '=')
+      break;
+    else
+      ++size;
+
+  if (*ep == NULL)
+    {
+      static char **last_environ = NULL;
+      char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
+      if (new_environ == NULL)
+	return -1;
+      (void) memcpy ((void *) new_environ, (void *) environ,
+		     size * sizeof (char *));
+      new_environ[size] = (char *) string;
+      new_environ[size + 1] = NULL;
+      if (last_environ != NULL)
+	free ((void *) last_environ);
+      last_environ = new_environ;
+      environ = new_environ;
+    }
+  else
+    *ep = (char *) string;
+
+  return 0;
+}