/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2017/10/15 bernard the first version */ #include #include #include #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; }