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Project/Src/rt-thread/components/libc/compilers/armlibc/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      implement stdio for armcc.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <rtthread.h>
+#include "libc.h"
+
+#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
+#include <dfs_posix.h>
+
+#define STDIO_DEVICE_NAME_MAX   32
+
+static int std_fd = -1;
+int libc_stdio_set_console(const char* device_name, int mode)
+{
+    int fd;
+    char name[STDIO_DEVICE_NAME_MAX];
+
+    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
+    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
+
+    fd = open(name, mode, 0);
+    if (fd >= 0)
+    {
+        if (std_fd >= 0)
+        {
+            close(std_fd);
+        }
+        std_fd = fd;
+    }
+
+    return std_fd;
+}
+
+int libc_stdio_get_console(void)
+{
+    return std_fd;
+}
+
+int libc_stdio_read(void *buffer, size_t size)
+{
+    if (std_fd >= 0)
+    {
+        return read(std_fd, buffer, size);
+    }
+    else
+    {
+        rt_kprintf("Illegal stdio input!\n");
+        return 0;
+    }
+}
+
+int libc_stdio_write(const void *buffer, size_t size)
+{
+    if (std_fd >= 0)
+    {
+        return write(std_fd, buffer, size);
+    }
+    else
+    {
+        rt_kprintf("Illegal stdio output!\n");
+        return size;
+    }
+}
+#endif