Add perror()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5061 42af7a65-404d-4744-a932-0658087f49c3
2026-09-20 21:06:58 +08:00 · 2012-08-28 19:01:14 +00:00
parent da30d409a0
commit 94a048002b
9 changed files with 382 additions and 17 deletions
@@ -0,0 +1,130 @@
+/****************************************************************************
+ * lib/stdio/lib_perror.c
+ *
+ *   Copyright (C) 2012 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>
+
+#include <stdio.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* POSIX requires that perror provide its output on stderr.  This option may
+ * be defined, however, to provide perror output that is serialized with
+ * other stdout messages.
+ */
+ 
+#ifdef CONFIG_LIBC_PERROR_STDOUT
+#  define PERROR_STREAM stdout
+#  undef CONFIG_LIBC_PERROR_DEVNAME
+#endif
+
+/* Another non-standard option is to provide perror output to a logging
+ * device or file. CONFIG_LIBC_PERROR_DEVNAME may be defined to be any write-
+ * able, character device (or file).
+ */
+
+#ifndef CONFIG_LIBC_PERROR_DEVNAME
+#  define PERROR_STREAM stderr
+#else
+#  define PERROR_STREAM perror_stream;
+#endif
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#ifndef CONFIG_LIBC_PERROR_DEVNAME
+static FILE *perror_stream;
+#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: perror
+ ****************************************************************************/
+
+void perror(FAR const char *s)
+{
+  /* If we are using a custom output device (something other than
+   * /dev/console), then make sure that the device has been opened.
+   */
+
+#ifdef CONFIG_LIBC_PERROR_DEVNAME
+  if (!perror_stream)
+    {
+      /* Not yet.. open it now */
+
+      perror_stream = fopen(CONFIG_LIBC_PERROR_DEVNAME, "w");
+      if (!perror_stream)
+        {
+          /* Oops... we couldn't open the device */
+
+          return;
+        }
+    }
+#endif
+
+  /* If strerror() is not enabled, then just print the error number */
+
+#ifdef CONFIG_LIBC_STRERROR
+  (void)fprintf(PERROR_STREAM, "%s: %s\n", s, strerror(errno));
+#else
+  (void)fprintf(PERROR_STREAM, "%s: Error %d\n", s, errno);
+#endif
+}