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Project/Src/rt-thread/components/libc/compilers/newlib/stdio.c

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+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <rtthread.h>
+#include "libc.h"
+
+#define STDIO_DEVICE_NAME_MAX   32
+
+int	_EXFUN(fileno, (FILE *));
+
+static FILE* std_console = NULL;
+
+int libc_stdio_set_console(const char* device_name, int mode)
+{
+    FILE *fp;
+    char name[STDIO_DEVICE_NAME_MAX];
+    char *file_mode;
+
+    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
+    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
+
+    if (mode == O_RDWR) file_mode = "r+";
+    else if (mode == O_WRONLY) file_mode = "wb";
+    else file_mode = "rb";
+
+    fp = fopen(name, file_mode);
+    if (fp)
+    {
+        setvbuf(fp, NULL, _IONBF, 0);
+
+        if (std_console)
+        {
+            fclose(std_console);
+            std_console = NULL;
+        }
+        std_console = fp;
+
+        if (mode == O_RDWR)
+        {
+            _GLOBAL_REENT->_stdin  = std_console;
+        }
+        else 
+        {
+            _GLOBAL_REENT->_stdin  = NULL;
+        }
+
+        if (mode == O_RDONLY)
+        {
+            _GLOBAL_REENT->_stdout = NULL;
+            _GLOBAL_REENT->_stderr = NULL;
+        }
+        else
+        {
+            _GLOBAL_REENT->_stdout = std_console;
+            _GLOBAL_REENT->_stderr = std_console;
+        }
+
+        _GLOBAL_REENT->__sdidinit = 1;
+    }
+
+    if (std_console) return fileno(std_console);
+
+    return -1;
+}
+
+int libc_stdio_get_console(void) {
+    if (std_console)
+        return fileno(std_console);
+    else
+        return -1;
+}