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The C Users' Group Library 1994 August
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v_06_07
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v6n7070a.txt
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1989-09-28
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/* PRN device driver which truncates lines and paginates */
#define LINES_PER_PAGE 55
#define LINE_LENGTH 79
#define TAB_SPACING 8
#include "dd.h"
#include <dos.h>
void init() {
request_header->status = DONE_STATUS;
}
void media_check() {bad_device_driver_function();}
void build_bpb() {bad_device_driver_function();}
void ioctl_input() {bad_device_driver_function();}
void input() {bad_device_driver_function();}
void nondestructive_input() {bad_device_driver_function();}
void input_status() {bad_device_driver_function();}
void input_flush() {bad_device_driver_function();}
static void BIOS_print(c) int c; {
union REGS r;
r.h.ah = 0;
r.h.al = c;
r.x.dx = 0;
int86(0x17, &r, &r);
if (r.h.ah&1) {
request_header->status = ERROR_STATUS+DONE_STATUS+WRITE_FAULT;
exit();
}
}
static int line = 0;
static int column = 0;
static void print_character(c) int c; {
switch (c) {
case '\t':
do print_character(' ');
while (column%TAB_SPACING!=0 && column<LINE_LENGTH);
break;
case '\f':
BIOS_print(c);
line = 0;
break;
case '\r':
BIOS_print(c);
column = 0;
break;
case '\n':
BIOS_print(c);
if (++line == LINES_PER_PAGE) {
BIOS_print('\f');
line = 0;
}
break;
default:
if (' '<=c && c<='~' && column<LINE_LENGTH) {
BIOS_print(c);
column++;
}
}
}
void output() {
int k;
for (k=0; k<request_header->x.io.count; k++)
print_character(request_header->x.io.transfer_address[k]);
request_header->status = DONE_STATUS;
}
void output_with_verify() {bad_device_driver_function();}
void output_status() {bad_device_driver_function();}
void output_flush() {bad_device_driver_function();}
void ioctl_output() {bad_device_driver_function();}