Add logic to support an NSH-specific system command

nshlib/nsh_system.c

@@ -0,0 +1,98 @@
+/****************************************************************************
+ * apps/nshlib/nsh_system.c
+ *
+ *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "nsh.h"
+#include "nsh_console.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nsh_system
+ *
+ * Description:
+ *   This is the NSH-specific implementation of the standard system()
+ *   command.
+ *
+ *   NOTE: This assumes that other NSH instances have previously ran and so
+ *   common NSH logic is already initialized.
+ *
+ * Input Parameters:
+ *   Standard task start-up arguments.  Expects argc == 2 with argv[1] being
+ *   the command to execute
+ *
+ * Returned Values:
+ *   EXIT_SUCCESS or EXIT_FAILURE
+ *
+ ****************************************************************************/
+
+int nsh_system(int argc, char *argv[])
+{
+  /* Expect argc == 2 with argv[1] being the command to execute */
+
+  if (argc >= 2)
+    {
+      FAR struct console_stdio_s *pstate = nsh_newconsole();
+      FAR struct nsh_vtbl_s *vtbl;
+
+      DEBUGASSERT(pstate != NULL && pstate->cn_vtbl != NULL);
+      vtbl = &pstate->cn_vtbl;
+
+      /* Parse process the command */
+
+      (void)nsh_parse(vtbl, argv[1]);
+      fflush(pstate->cn_outstream);
+
+      /* Exit upon return */
+
+      nsh_exit(&pstate->cn_vtbl, OK);
+      return EXIT_SUCCESS;
+    }
+  else
+    {
+      return EXIT_FAILURE;
+    }
+}