2009-11-18 Chris Johns <chrisj@rtems.org>

        * libmisc/shell/main_getenv.c, libmisc/shell/main_setenv.c,
        libmisc/shell/main_unsetenv.c: New. The shell can now play with
        environment variables.
        * libmisc/Makefile.am, libmisc/shell/shellconfig.h: Add setenv,
        getenv, and unsetenv to the shell.

4 files changed, 185 insertions, 0 deletions

diff --git a/cpukit/libmisc/shell/main_getenv.c b/cpukit/libmisc/shell/main_getenv.c
new file mode 100644
index 0000000000..d18c301ee3
--- /dev/null
+++ b/cpukit/libmisc/shell/main_getenv.c
@@ -0,0 +1,49 @@
+/*
+ * Get an environment vairable.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <rtems.h>
+#include <rtems/shell.h>
+#include "internal.h"
+
+int rtems_shell_main_getenv(int argc, char *argv[])
+{
+  char* string;
+
+  if (argc != 2)
+  {
+    printf ("error: only argument is the variable name\n");
+    return 1;
+  }
+
+  string = getenv (argv[1]);
+
+  if (!string)
+  {
+    printf ("error: %s not found\n", argv[1]);
+    return 1;
+  }
+
+  printf ("%s\n", string);
+  
+  return 0;
+}
+
+rtems_shell_cmd_t rtems_shell_GETENV_Command = {
+  "getenv",                      /* name */
+  "getenv [var]",                /* usage */
+  "misc",                        /* topic */
+  rtems_shell_main_getenv,       /* command */
+  NULL,                          /* alias */
+  NULL                           /* next */
+};
diff --git a/cpukit/libmisc/shell/main_setenv.c b/cpukit/libmisc/shell/main_setenv.c
new file mode 100644
index 0000000000..7164c27f9a
--- /dev/null
+++ b/cpukit/libmisc/shell/main_setenv.c
@@ -0,0 +1,75 @@
+/*
+ * Set an environment vairable.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <rtems.h>
+#include <rtems/shell.h>
+#include "internal.h"
+
+int rtems_shell_main_setenv(int argc, char *argv[])
+{
+  char* env = NULL;
+  char* string = NULL;
+  int   len = 0;
+  int   arg;
+  char* p;
+
+  if (argc <= 2)
+  {
+    printf ("error: no variable or string\n");
+    return 1;
+  }
+
+  env = argv[1];
+  
+  for (arg = 2; arg < argc; arg++)
+    len += strlen (argv[arg]);
+
+  len += argc - 2 - 1;
+
+  string = malloc (len + 1);
+  
+  if (!string)
+  {
+    printf ("error: no memory\n");
+    return 1;
+  }
+  
+  for (arg = 2, p = string; arg < argc; arg++)
+  {
+    strcpy (p, argv[arg]);
+    p += strlen (argv[arg]);
+    if (arg < (argc - 1))
+    {
+      *p = ' ';
+      p++;
+    }
+  }
+  
+  if (setenv (env, string, 1) < 0)
+  {
+    printf ("error: %s\n", strerror (errno));
+    return 1;
+  }
+
+  return 0;
+}
+
+rtems_shell_cmd_t rtems_shell_SETENV_Command = {
+  "setenv",                      /* name */
+  "setenv [var] [string]",       /* usage */
+  "misc",                        /* topic */
+  rtems_shell_main_setenv,       /* command */
+  NULL,                          /* alias */
+  NULL                           /* next */
+};
diff --git a/cpukit/libmisc/shell/main_unsetenv.c b/cpukit/libmisc/shell/main_unsetenv.c
new file mode 100644
index 0000000000..91d9dac7a4
--- /dev/null
+++ b/cpukit/libmisc/shell/main_unsetenv.c
@@ -0,0 +1,43 @@
+/*
+ * Unset an environment vairable.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <rtems.h>
+#include <rtems/shell.h>
+#include "internal.h"
+
+int rtems_shell_main_unsetenv(int argc, char *argv[])
+{
+  if (argc != 2)
+  {
+    printf ("error: only argument is the variable name\n");
+    return 1;
+  }
+
+  if (unsetenv (argv[1]) < 0)
+  {
+    printf ("error: %s\n", strerror (errno));
+    return 1;
+  }
+  
+  return 0;
+}
+
+rtems_shell_cmd_t rtems_shell_UNSETENV_Command = {
+  "unsetenv",                    /* name */
+  "unsetenv [var]",              /* usage */
+  "misc",                        /* topic */
+  rtems_shell_main_unsetenv,     /* command */
+  NULL,                          /* alias */
+  NULL                           /* next */
+};
diff --git a/cpukit/libmisc/shell/shellconfig.h b/cpukit/libmisc/shell/shellconfig.h
index 1410430440..3d731aa0ef 100644
--- a/cpukit/libmisc/shell/shellconfig.h
+++ b/cpukit/libmisc/shell/shellconfig.h
@@ -23,6 +23,9 @@ extern rtems_shell_cmd_t rtems_shell_HELP_Command;
 extern rtems_shell_cmd_t rtems_shell_ALIAS_Command;
 extern rtems_shell_cmd_t rtems_shell_TIME_Command;
 extern rtems_shell_cmd_t rtems_shell_LOGOFF_Command;
+extern rtems_shell_cmd_t rtems_shell_SETENV_Command;
+extern rtems_shell_cmd_t rtems_shell_GETENV_Command;
+extern rtems_shell_cmd_t rtems_shell_UNSETENV_Command;
 
 extern rtems_shell_cmd_t rtems_shell_MDUMP_Command;
 extern rtems_shell_cmd_t rtems_shell_WDUMP_Command;
@@ -195,6 +198,21 @@ extern rtems_shell_filesystems_t *rtems_shell_Mount_filesystems[];
         defined(CONFIGURE_SHELL_COMMAND_LOGOFF)
       &rtems_shell_LOGOFF_Command,
     #endif
+    #if (defined(CONFIGURE_SHELL_COMMANDS_ALL) && \
+         !defined(CONFIGURE_SHELL_NO_COMMAND_SETENV)) || \
+        defined(CONFIGURE_SHELL_COMMAND_SETENV)
+      &rtems_shell_SETENV_Command,
+    #endif
+    #if (defined(CONFIGURE_SHELL_COMMANDS_ALL) && \
+         !defined(CONFIGURE_SHELL_NO_COMMAND_GETENV)) || \
+        defined(CONFIGURE_SHELL_COMMAND_GETENV)
+      &rtems_shell_GETENV_Command,
+    #endif
+    #if (defined(CONFIGURE_SHELL_COMMANDS_ALL) && \
+         !defined(CONFIGURE_SHELL_NO_COMMAND_CRLENV)) || \
+        defined(CONFIGURE_SHELL_COMMAND_UNSETENV)
+      &rtems_shell_UNSETENV_Command,
+    #endif
 
     /*
      *  Memory printing/modification family commands