ntpd: default to FEATURE_NTP_AUTH=y

[oweals/busybox.git] / coreutils / printenv.c

diff --git a/coreutils/printenv.c b/coreutils/printenv.c
index 33be5c09601aea7a38c32349d415ba5fd7428734..b0468b3f703e343d5a0c2e5ec2aec0716ef6bd6f 100644 (file)
--- a/coreutils/printenv.c
+++ b/coreutils/printenv.c
@@ -7,6 +7,21 @@
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
+//config:config PRINTENV
+//config:      bool "printenv (1 kb)"
+//config:      default y
+//config:      help
+//config:      printenv is used to print all or part of environment.
+
+//applet:IF_PRINTENV(APPLET_NOFORK(printenv, printenv, BB_DIR_BIN, BB_SUID_DROP, printenv))
+
+//kbuild:lib-$(CONFIG_PRINTENV) += printenv.o
+
+//usage:#define printenv_trivial_usage
+//usage:       "[VARIABLE]..."
+//usage:#define printenv_full_usage "\n\n"
+//usage:       "Print environment VARIABLEs.\n"
+//usage:       "If no VARIABLE specified, print all."
 
 #include "libbb.h"
 
@@ -19,9 +34,14 @@ int printenv_main(int argc UNUSED_PARAM, char **argv)
 
        /* no variables specified, show whole env */
        if (!argv[1]) {
-               int e = 0;
-               while (environ[e])
-                       puts(environ[e++]);
+               char **e = environ;
+
+               /* environ can be NULL! (for example, after clearenv())
+                * Check for that:
+                */
+               if (e)
+                       while (*e)
+                               puts(*e++);
        } else {
                /* search for specified variables and print them out if found */
                char *arg, *env;