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      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  * rawcon_read.c
     30  *
     31  * Character-oriented reading from the console without echo;
     32  * this is a NONBLOCKING device.
     33  */
     34 
     35 #include <errno.h>
     36 #include <string.h>
     37 #include <com32.h>
     38 #include <core.h>
     39 #include <minmax.h>
     40 #include "file.h"
     41 
     42 /* Global, since it's used by stdcon_read */
     43 ssize_t __rawcon_read(struct file_info *fp, void *buf, size_t count)
     44 {
     45     char *bufp = buf;
     46     size_t n = 0;
     47     static char hi = 0;
     48     static bool hi_key = false;
     49 
     50     (void)fp;
     51 
     52     while (n < count) {
     53 	if (hi_key) {
     54 	    *bufp++ = hi;
     55 	    n++;
     56 	    hi_key = false;
     57 	    continue;
     58 	}
     59 
     60 	/* Poll */
     61 	if (!pollchar())
     62 	    break;
     63 
     64 	/* We have data, go get it */
     65 	*bufp = getchar(&hi);
     66 	if (!*bufp)
     67 		hi_key = true;
     68 
     69 	bufp++;
     70 	n++;
     71     }
     72 
     73     return n;
     74 }
     75 
     76 const struct input_dev dev_rawcon_r = {
     77     .dev_magic = __DEV_MAGIC,
     78     .flags = __DEV_TTY | __DEV_INPUT,
     79     .fileflags = O_RDONLY,
     80     .read = __rawcon_read,
     81     .close = NULL,
     82     .open = NULL,
     83 };
     84