1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2004-2008 H. Peter Anvin - All Rights Reserved 4 * 5 * Permission is hereby granted, free of charge, to any person 6 * obtaining a copy of this software and associated documentation 7 * files (the "Software"), to deal in the Software without 8 * restriction, including without limitation the rights to use, 9 * copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom 11 * the Software is furnished to do so, subject to the following 12 * conditions: 13 * 14 * The above copyright notice and this permission notice shall 15 * be included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 * 26 * ----------------------------------------------------------------------- */ 27 28 /* 29 * stdcon_read.c 30 * 31 * Line-oriented reading from the standard console 32 */ 33 34 #include <errno.h> 35 #include <string.h> 36 #include <com32.h> 37 #include <minmax.h> 38 #include "file.h" 39 40 extern ssize_t __rawcon_read(struct file_info *fp, void *buf, size_t count); 41 42 static ssize_t __stdcon_read(struct file_info *fp, void *buf, size_t count) 43 { 44 char *bufp = buf; 45 size_t n = 0; 46 char ch; 47 48 (void)fp; 49 50 while (n < count) { 51 if (fp->i.nbytes) { 52 ch = *bufp++ = *fp->i.datap++; 53 fp->i.nbytes--; 54 n++; 55 if (ch == '\n') 56 return n; 57 } else { 58 fp->i.nbytes = __line_input(fp, fp->i.buf, MAXBLOCK, __rawcon_read); 59 fp->i.datap = fp->i.buf; 60 61 if (fp->i.nbytes == 0) 62 return n; 63 } 64 } 65 66 return n; 67 } 68 69 const struct input_dev dev_stdcon_r = { 70 .dev_magic = __DEV_MAGIC, 71 .flags = __DEV_TTY | __DEV_INPUT, 72 .fileflags = O_RDONLY, 73 .read = __stdcon_read, 74 .close = NULL, 75 .open = NULL, 76 }; 77
