1 files changed, 97 insertions, 0 deletions
diff --git a/src/libs/libgroff/putenv.c b/src/libs/libgroff/putenv.c
new file mode 100644
index 0000000..692a126
--- /dev/null
+++ b/src/libs/libgroff/putenv.c
@@ -0,0 +1,97 @@
+/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+This file is part of 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 3 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Hacked slightly by jjc@jclark.com for groff. */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+
+#ifdef __STDC__
+#include <stddef.h>
+typedef void *PTR;
+typedef size_t SIZE_T;
+#else /* not __STDC__ */
+typedef char *PTR;
+typedef int SIZE_T;
+#endif /* not __STDC__ */
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#else /* not HAVE_STDLIB_H */
+PTR malloc();
+#endif /* not HAVE_STDLIB_H */
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+extern char **environ;
+
+/* Put STRING, which is of the form 'NAME=VALUE', in the environment.  */
+
+int putenv(const char *string)
+{
+  char *name_end = strchr(string, '=');
+  SIZE_T size;
+  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((PTR) new_environ, (PTR) environ, size * sizeof(char *));
+      new_environ[size] = (char *) string;
+      new_environ[size + 1] = NULL;
+      if (last_environ != NULL)
+	free((PTR) last_environ);
+      last_environ = new_environ;
+      environ = new_environ;
+    }
+  else
+    *ep = (char *) string;
+
+  return 0;
+}