com32/lib/sys/xserial_write.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2004-2006 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  * xserial_write.c
  30  *
  31  * Raw writing to the serial port; no \n -> \r\n translation, but
  32  * convert \1# sequences.
  33  */
  34
  35 #include <errno.h>
  36 #include <string.h>
  37 #include <com32.h>
  38 #include <minmax.h>
  39 #include <colortbl.h>
  40 #include "file.h"
  41
  42 static void emit(char ch)
  43 {
  44   static com32sys_t ireg;       /* Zeroed with the BSS */
  45
  46   ireg.eax.w[0] = 0x0400 | (unsigned char)ch;
  47
  48   __intcall(0x21, &ireg, NULL);
  49 }
  50
  51 ssize_t __xserial_write(struct file_info *fp, const void *buf, size_t count)
  52 {
  53   const char *bufp = buf;
  54   size_t n = 0;
  55   static enum { st_0, st_1, st_2, st_3 } state = st_0;
  56   static int ncolor = 0;
  57   int num;
  58   const char *p;
  59
  60   (void)fp;
  61
  62   while ( count-- ) {
  63     unsigned char ch = *bufp++;
  64
  65     switch (state) {
  66     case st_0:
  67       if (ch == '\1') {
  68         state = st_1;
  69       } else {
  70         emit(ch);
  71       }
  72       break;
  73
  74     case st_1:
  75       if (ch == '#') {
  76         state = st_2;
  77         ncolor = 0;
  78       } else {
  79         state = st_0;
  80       }
  81       break;
  82
  83     case st_2:
  84       num = ch-'0';
  85       if (num < 10) {
  86         ncolor = num*10;
  87         state = st_3;
  88       } else {
  89         state = st_0;
  90       }
  91       break;
  92
  93     case st_3:
  94       num = ch-'0';
  95       if (num < 10) {
  96         ncolor += num;
  97
  98         if (ncolor < console_color_table_size) {
  99           emit('\033');
 100           emit('[');
 101           emit('0');
 102           emit(';');
 103           for (p = console_color_table[ncolor].ansi; *p; p++)
 104             emit(*p);
 105           emit('m');
 106         }
 107       }
 108       state = st_0;
 109       break;
 110     }
 111
 112     n++;
 113   }
 114
 115   return n;
 116 }