135 __attribute__((weak)) int _sys_write(FILEHANDLE fh, const uint8_t *buf, uint32_t len, int mode)  in _sys_write()  argument
138     (void)len;  in _sys_write()
154 __attribute__((weak)) int _sys_read(FILEHANDLE fh, uint8_t *buf, uint32_t len, int mode)  in _sys_read()  argument
157     (void)len;  in _sys_read()
163         return ((int)(len | 0x80000000U));  in _sys_read()
222 __attribute__((weak)) char *(_sys_command_string)(char *cmd, int len)
224     (void)len;
271 int _read(int fd, char *ptr, int len)  in _read()  argument
277     for (i = 0; i < len; i++)  in _read()
285     return (len - i);  in _read()
288 int _write(int fd, char *ptr, int len)  in _write()  argument
293     for (i = 0; i < len; i++)  in _write()