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/*
* Copyright (c) 1994 Geoffrey M. Rehmet
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Geoffrey M. Rehmet
* 4. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: lptcontrol.c,v 1.2 1994/09/03 22:46:50 csgr Exp $
*/
#include <ctype.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <machine/lpt.h>
#include <sys/errno.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#define PATH_LPCTL _PATH_DEV "lpctl"
#define DEFAULT_UNIT "0"
#define IRQ_INVALID -1
#define DO_POLL 0
#define USE_IRQ 1
static void usage(const char * progname)
{
fprintf(stderr, "usage: %s -i | -p [-u <unit no.>]\n", progname);
fprintf(stderr, "\tUnit no. is a value in the range 0 to 3\n");
fprintf(stderr, "\tThe default unit no is 0 (ie. /dev/lpt0)\n");
exit(1);
}
static void set_interrupt_status(int irq_status, const char * file)
{
int fd;
if((fd = open(file, O_WRONLY, 0660)) < 0) {
perror("open");
exit(1);
}
if(ioctl(fd, LPT_IRQ, &irq_status) < 0) {
perror("ioctl");
exit(1);
}
close(fd);
}
static char * dev_file(char unit_no)
{
static char devname[_POSIX_PATH_MAX+1];
int len;
strncpy(devname, PATH_LPCTL, _POSIX_PATH_MAX);
devname[len = strlen(devname)] = unit_no;
devname[++len] = '\0';
return(devname);
}
int main (int argc, char * argv[])
{
int opt;
int irq_status = IRQ_INVALID;
char * unit = DEFAULT_UNIT;
while((opt = getopt(argc, argv, "ipu:")) != -1)
switch(opt) {
case 'i': irq_status = USE_IRQ; break;
case 'p': irq_status = DO_POLL; break;
case 'u': unit = optarg;
if(!isdigit(*unit))
usage(argv[0]);
break;
default : usage(argv[0]);
}
if(irq_status == IRQ_INVALID)
usage(argv[0]);
set_interrupt_status(irq_status, dev_file(*unit));
exit(0);
}
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