1 files changed, 69 insertions, 0 deletions
diff --git a/src/printenv.c b/src/printenv.c
new file mode 100644
index 000000000..ac4511cc5
--- /dev/null
+++ b/src/printenv.c
@@ -0,0 +1,69 @@
+/* printenv -- print all or part of environment
+   Copyright (C) 1989, 1991 Free Software Foundation.
+
+   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Usage: printenv [variable...]
+
+   If no arguments are given, print the entire environment.
+   If one or more variable names are given, print the value of
+   each one that is set, and nothing for ones that are not set.
+
+   Exit status:
+   0 if all variables specified were found
+   1 if not
+
+   David MacKenzie and Richard Mlynarik */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include "system.h"
+
+extern char **environ;
+
+void
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  char **env;
+  char *ep, *ap;
+  int i;
+  int matches = 0;
+
+  if (argc == 1)
+    {
+      for (env = environ; *env; ++env)
+	puts (*env);
+      exit (0);
+    }
+
+  for (i = 1; i < argc; ++i)
+    {
+      for (env = environ; *env; ++env)
+	{
+	  ep = *env;
+	  ap = argv[i];
+	  while (*ep != '\0' && *ap != '\0' && *ep++ == *ap++)
+	    if (*ep == '=' && *ap == '\0')
+	      {
+		puts (ep + 1);
+		++matches;
+		break;
+	      }
+	}
+    }
+  exit (matches != argc - 1);
+}