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 <syslinux/config.h>
  41 #include "file.h"
  42
  43 static void emit(char ch)
  44 {
  45   static com32sys_t ireg;       /* Zeroed with the BSS */
  46
  47   ireg.eax.b[1] = 0x04;
  48   ireg.edx.b[0] = ch;
  49
  50   __intcall(0x21, &ireg, NULL);
  51 }
  52
  53 ssize_t __xserial_write(struct file_info *fp, const void *buf, size_t count)
  54 {
  55   const char *bufp = buf;
  56   size_t n = 0;
  57   static enum { st_init, st_tbl, st_tblc } state = st_init;
  58   static int ndigits;
  59   static int ncolor = 0;
  60   int num;
  61   const char *p;
  62
  63   (void)fp;
  64
  65   if (!syslinux_serial_console_info()->iobase)
  66     return count;               /* Nothing to do */
  67
  68   while ( count-- ) {
  69     unsigned char ch = *bufp++;
  70
  71     switch (state) {
  72     case st_init:
  73       if (ch >= 1 && ch <= 5) {
  74         state = st_tbl;
  75         ndigits = ch;
  76       } else {
  77         emit(ch);
  78       }
  79       break;
  80
  81     case st_tbl:
  82       if (ch == '#') {
  83         state = st_tblc;
  84         ncolor = 0;
  85       } else {
  86         state = st_init;
  87       }
  88       break;
  89
  90     case st_tblc:
  91       num = ch-'0';
  92       if (num < 10) {
  93         ncolor = (ncolor*10)+num;
  94         if (--ndigits == 0) {
  95           if (ncolor < console_color_table_size) {
  96             emit('\033');
  97             emit('[');
  98             emit('0');
  99             emit(';');
 100             for (p = console_color_table[ncolor].ansi; *p; p++)
 101               emit(*p);
 102             emit('m');
 103           }
 104           state = st_init;
 105         }
 106       } else {
 107         state = st_init;
 108       }
 109       break;
 110     }
 111     n++;
 112   }
 113
 114   return n;
 115 }