box/coreutils/printenv.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * printenv implementation for busybox
   4  *
   5  * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
   6  * Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
   7  *
   8  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   9  */
  10
  11 #include "libbb.h"
  12 extern char **environ;
  13
  14 int printenv_main(int argc, char **argv);
  15 int printenv_main(int argc, char **argv)
  16 {
  17         int e = 0;
  18
  19         /* no variables specified, show whole env */
  20         if (argc == 1)
  21                 while (environ[e])
  22                         puts(environ[e++]);
  23
  24         /* search for specified variables and print them out if found */
  25         else {
  26                 int i;
  27                 size_t l;
  28                 char *arg, *env;
  29
  30                 for (i=1; (arg = argv[i]); ++i)
  31                         for (; (env = environ[e]); ++e) {
  32                                 l = strlen(arg);
  33                                 if (!strncmp(env, arg, l) && env[l] == '=')
  34                                         puts(env + l + 1);
  35                         }
  36         }
  37
  38         fflush_stdout_and_exit(0);
  39 }