Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-11-03 05:31:36 +08:00 · 2012-09-17 18:18:44 +00:00
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+/****************************************************************************
+ * env_getenv.c
+ *
+ *   Copyright (C) 2007, 2008 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 NuttX 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>
+
+#ifndef CONFIG_DISABLE_ENVIRON
+
+#include <sched.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "os_internal.h"
+#include "env_internal.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getenv
+ *
+ * Description:
+ *   The getenv() function searches the environment list for a string that
+ *   matches the string pointed to by name.
+ *
+ * Parameters:
+ *   name - The name of the variable to find. 
+ *
+ * Return Value:
+ *   The value of the valiable (read-only) or NULL on failure
+ *
+ * Assumptions:
+ *   Not called from an interrupt handler
+ *
+ ****************************************************************************/
+
+FAR char *getenv(const char *name)
+{
+  FAR _TCB      *rtcb;
+  FAR environ_t *envp;
+  FAR char      *pvar;
+  FAR char      *pvalue = NULL;
+  int ret = OK;
+
+  /* Verify that a string was passed */
+
+  if (!name)
+    {
+      ret = EINVAL;
+      goto errout;
+    }
+
+  /* Get a reference to the thread-private environ in the TCB.*/
+
+  sched_lock();
+  rtcb = (FAR _TCB*)g_readytorun.head;
+  envp = rtcb->envp;
+
+  /* Check if the variable exists */
+
+  if ( !envp || (pvar = env_findvar(envp, name)) == NULL)
+    {
+      ret = ENOENT;
+      goto errout_with_lock;
+    }
+
+  /* It does!  Get the value sub-string from the name=value string */
+
+  pvalue = strchr(pvar, '=');
+  if (!pvalue)
+    {
+      /* The name=value string has no '='  This is a bug! */
+
+      ret = EINVAL;
+      goto errout_with_lock;
+    }
+
+  /* Adjust the pointer so that it points to the value right after the '=' */
+
+  pvalue++;
+  sched_unlock();
+  return pvalue;
+
+errout_with_lock:
+  sched_unlock();
+errout:
+  set_errno(ret);
+  return NULL;
+}
+
+#endif /* CONFIG_DISABLE_ENVIRON */
+
+
+