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
2026-11-01 04:11:36 +08:00 · 2012-09-17 18:18:44 +00:00
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+/****************************************************************************
+ * sched/env_setenv.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 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 <stdio.h>
+#include <stdlib.h>
+#include <sched.h>
+#include <string.h>
+#include <errno.h>
+
+#include <nuttx/kmalloc.h>
+
+#include "os_internal.h"
+#include "env_internal.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: setenv
+ *
+ * Description:
+ *   The setenv() function adds the variable name to the environment with the
+ *   specified 'value' if the varialbe 'name" does not exist. If the 'name'
+ *   does exist in the environment, then its value is changed to 'value' if
+ *   'overwrite' is non-zero; if 'overwrite' is zero, then the value of name
+ *   unaltered.
+ *
+ * Parameters:
+ *   name - The name of the variable to change
+ *   value - The new value of the variable
+ *   overwrite - Replace any existing value if non-zero.
+ *
+ * Return Value:
+ *   Zero on success
+ *
+ * Assumptions:
+ *   Not called from an interrupt handler
+ *
+ ****************************************************************************/
+
+int setenv(const char *name, const char *value, int overwrite)
+{
+  FAR _TCB      *rtcb;
+  FAR environ_t *envp;
+  FAR char      *pvar;
+  int            varlen;
+  int ret = OK;
+
+  /* Verify input parameter */
+
+  if (!name)
+    {
+      ret = EINVAL;
+      goto errout;
+    }
+
+  /* if no value is provided, then this is the same as unsetenv (unless
+   * overwrite is false)
+   */
+
+  if (!value || *value == '\0')
+    {
+      /* If overwite is set then this is the same as unsetenv */
+
+      if (overwrite)
+        {
+          return unsetenv(name);
+        }
+      else
+        {
+          /* Otherwise, it is a request to remove a variable without altering it? */
+
+          return OK;
+        }
+    }
+
+  /* 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 alreay exists */
+
+  if ( envp && (pvar = env_findvar(envp, name)) != NULL)
+    {
+      /* It does!  Do we have permission to overwrite the existing value? */
+
+      if (!overwrite)
+        {
+          /* No.. then just return success */
+
+          sched_unlock();
+          return OK;
+        }
+
+      /* Yes.. just remove the name=value pair from the environment.  It will
+       * be added again below.  Note that we are responsible for reallocating
+       * the environment buffer; this will happen below.
+       */
+
+      (void)env_removevar(envp, pvar);
+    }
+
+  /* Get the size of the new name=value string.  The +2 is for the '=' and for
+   * null terminator
+   */
+
+  varlen = strlen(name) + strlen(value) + 2;
+
+  /* Then allocate or reallocate the environment buffer */
+
+  if (envp)
+    {
+      int        alloc = envp->ev_alloc;
+      environ_t *tmp   = (environ_t*)krealloc(envp, SIZEOF_ENVIRON_T(alloc + varlen));
+      if (!tmp)
+        {
+          ret = ENOMEM;
+          goto errout_with_lock;
+        }
+
+      envp           = tmp;
+      envp->ev_alloc = alloc + varlen;
+      pvar           = &envp->ev_env[alloc];
+    }
+  else
+    {
+      envp = (environ_t*)kmalloc(SIZEOF_ENVIRON_T(varlen));
+      if (!envp)
+        {
+          ret = ENOMEM;
+          goto errout_with_lock;
+        }
+
+      envp->ev_crefs = 1;
+      envp->ev_alloc = varlen;
+      pvar           = envp->ev_env;
+    }
+
+  /* Now, put the new name=value string into the environment buffer */
+
+  sprintf(pvar, "%s=%s", name, value);
+
+  /* Save the new environment pointer (it might have changed due to allocation or
+   * reallocation.
+   */
+
+  rtcb->envp = envp;
+  sched_unlock();
+  return OK;
+
+errout_with_lock:
+  sched_unlock();
+errout:
+  errno = ret;
+  return ERROR;
+}
+
+#endif /* CONFIG_DISABLE_ENVIRON */
+
+
+