[GitHub] [incubator-nuttx] xiaoxiang781216 commented on a change in pull request #4894: libc/misc:add err.c to libc

[GitBox <gi...@apache.org>]

xiaoxiang781216 commented on a change in pull request #4894:
URL: https://github.com/apache/incubator-nuttx/pull/4894#discussion_r760937037



##########
File path: include/err.h
##########
@@ -0,0 +1,133 @@
+/****************************************************************************
+ * include/err.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_ERR_H
+#define __INCLUDE_ERR_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdarg.h>
+#include <nuttx/compiler.h>
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/* Print "pid: ", FORMAT, ": ", the standard error string for errno,
+ *  and a newline, on stderr.
+ */
+
+static inline void vwarn(FAR const char *fmt, va_list ap)
+{
+  int error = errno;
+  struct va_format vaf;
+
+#ifdef va_copy
+  va_list copy;
+
+  va_copy(copy, ap);
+
+  vaf.fmt = fmt;
+  vaf.va  = &copy;
+#else
+  vaf.fmt = fmt;
+  vaf.va  = &ap;
+#endif
+
+#ifdef CONFIG_FILE_STREAM
+  fprintf(stderr, "%d: %pV: %s\n", getpid(), &vaf, strerror(error));
+#else
+  printf("%d: %pV: %s\n", getpid(), &vaf, strerror(error));

Review comment:
       dprintf




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