/*  * 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 */#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 <asm/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);}