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/*
* outp.c -- write all the ports specified in hex on the command line.
* The program uses the faster ioperm/iopl calls on x86, /dev/port
* on other platforms. The program acts as outb/outw/outl according
* to its own name
*
* Copyright (C) 1998,2000,2001 Alessandro Rubini
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/io.h> /* linux-specific */
#ifdef __GLIBC__
# include <sys/perm.h>
#endif
#define PORT_FILE "/dev/port"
char *prgname;
#ifdef __i386__
static int write_one(unsigned int port, unsigned int val, int size)
{
static int iopldone = 0;
if (port > 1024) {
if (!iopldone && iopl(3)) {
fprintf(stderr, "%s: iopl(): %s\n", prgname, strerror(errno));
return 1;
}
iopldone++;
} else if (ioperm(port,size,1)) {
fprintf(stderr, "%s: ioperm(%x): %s\n", prgname,
port, strerror(errno));
return 1;
}
if (size == 4)
outl(val, port);
else if (size == 2)
outw(val&0xffff, port);
else
outb(val&0xff, port);
return 0;
}
#else /* not i386 */
static int write_one(unsigned int port, unsigned int val, int size)
{
static int fd = -1;
unsigned char b; unsigned short w;
if (fd < 0)
fd = open(PORT_FILE, O_WRONLY);
if (fd < 0) {
fprintf(stderr, "%s: %s: %s\n", prgname, PORT_FILE, strerror(errno));
return 1;
}
lseek(fd, port, SEEK_SET);
if (size == 4) {
write(fd, &val, 4);
} else if (size == 2) {
w = val;
write(fd, &w, 2);
} else {
b = val;
write(fd, &b, 1);
}
return 0;
}
#endif /* i386 */
int main(int argc, char **argv)
{
unsigned int i, n, port, val, size, error = 0;
prgname = argv[0];
/* find the data size */
switch (prgname[strlen(prgname)-1]) {
case 'w': size = 2; break;
case 'l': size = 4; break;
case 'b': case 'p': default:
size = 1;
}
setuid(0); /* if we're setuid, force it on */
for (i=1;i<argc-1;i++) {
if ( sscanf(argv[i], "%x%n", &port, &n) < 1
|| n != strlen(argv[i]) ) {
fprintf(stderr, "%s: argument \"%s\" is not a hex number\n",
argv[0], argv[i]);
error++; continue;
}
if (port & (size-1)) {
fprintf(stderr, "%s: argument \"%s\" is not properly aligned\n",
argv[0], argv[i]);
error++; continue;
}
if ( sscanf(argv[i+1], "%x%n", &val, &n) < 1
|| n != strlen(argv[i+1]) ) {
fprintf(stderr, "%s: argument \"%s\" is not a hex number\n",
argv[0], argv[i+1]);
error++; continue;
}
if (size < 4 && val > (size == 1 ? 0xff : 0xffff)) {
fprintf(stderr, "%s: argument \"%s\" out of range\n",
argv[0], argv[i+1]);
error++; continue;
}
error += write_one(port, val, size);
}
exit (error ? 1 : 0);
}
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