add a printenv implementation

git-svn-id: svn://busybox.net/trunk/busybox@10147 69ca8d6d-28ef-0310-b511-8ec308f3f277

3 files changed, 59 insertions, 0 deletions

diff --git a/coreutils/Config.in b/coreutils/Config.in
index a299506e6..466e8b880 100644
--- a/coreutils/Config.in
+++ b/coreutils/Config.in
@@ -164,6 +164,12 @@ config CONFIG_ENV
           a command; without options it displays the current
           environment.
 
+config CONFIG_PRINTENV
+        bool "printenv"
+        default n
+        help
+          printenv is used to print all or part of environment.
+
 config CONFIG_EXPR
         bool "expr"
         default n
diff --git a/coreutils/Makefile.in b/coreutils/Makefile.in
index 1a4872f66..130bdf48b 100644
--- a/coreutils/Makefile.in
+++ b/coreutils/Makefile.in
@@ -60,6 +60,7 @@ COREUTILS-$(CONFIG_MKNOD)   	+= mknod.o
 COREUTILS-$(CONFIG_MV)          += mv.o
 COREUTILS-$(CONFIG_NICE)        += nice.o
 COREUTILS-$(CONFIG_OD)          += od.o
+COREUTILS-$(CONFIG_PRINTENV)    += printenv.o
 COREUTILS-$(CONFIG_PRINTF)      += printf.o
 COREUTILS-$(CONFIG_PWD)         += pwd.o
 COREUTILS-$(CONFIG_REALPATH)    += realpath.o
diff --git a/coreutils/printenv.c b/coreutils/printenv.c
new file mode 100644
index 000000000..10f9dd22a
--- /dev/null
+++ b/coreutils/printenv.c
@@ -0,0 +1,52 @@
+/*
+ * printenv implementation for busybox
+ *
+ * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
+ *
+ * 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 of the License, 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 <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int printenv_main(int argc, char **argv)
+{
+        extern char **environ;
+        int e = 0;
+
+        /* no variables specified, show whole env */
+        if (argc == 1)
+                while (environ[e])
+                        puts(environ[e++]);
+
+        /* search for specified variables and print them out if found */
+        else {
+                int i;
+                size_t l;
+                char *arg, *env;
+
+                for (i=1; (arg = argv[i]); ++i)
+                        for (; (env = environ[e]); ++e) {
+                                l = strlen(arg);
+                                if (!strncmp(env, arg, l) && env[l] == '=')
+                                        puts(env + l + 1);
+                        }
+        }
+
+        exit(EXIT_SUCCESS);
+}