config.y

TCP-IP红宝书源代码

	    printf("\nConfiguration complete. Number of devs=%d:\n\n",ndevs);
	    for (s=devs; s!=NIL ; s=s->dvnext)
	      printf(
	        "Device %s (on %s) csr=0%-7o, ivec=0%-3o, ovec=0%-3o, minor=%d\n",
		s->dvname, s->dvdevice, s->dvcsr, s->dvivec, s->dvovec,
		s->dvminor);
	}
	

}


yyerror(s)
	char *s;
{
	fprintf(stderr,"Syntax error in %s on line %d\n",
		doing,linectr);
}


/*  lookup  --  lookup a name in the symbol table; return position */

lookup(str,len)
	char	*str;
	int	len;
{
	int	i;
	char	*s;

	if (len >= 20) {
		len = 19;
		fprintf(stderr,"warning: name %s truncated\n",str);
		}
	s = (char *)malloc(len+1);
	strncpy(s,str,len);
	s[len] = '\000';
	for (i=0 ; i<nsym ; i++)
		if (strcmp(s,symtab[i].symname) == 0){
			return(i);
		}
	symtab[nsym].symname = s;
	symtab[nsym].symoccurs = 0;
	return(nsym++);
}

int
l_atoi(p, len)
char	*p;
int	len;
{
	int	base, rv;

	if (*p == '0') {
		++p; --len;
		if (*p == 'x' || *p == 'X') {
			++p; --len;		/* skip 'x' */
			base = 16;
		} else
			base = 8;
	} else
		base = 10;
	rv = 0;
	for (; len > 0; ++p, --len) {
		rv *= base;
		if (isdigit(*p))
			rv += *p - '0';
		else if (isupper(*p))
			rv += *p - 'A' + 10;
		else
			rv += *p - 'a' + 10;
	}
	return rv;
}

/* newattr -- add a new attribute spec to current type/device description	*/

newattr(tok,val)
	int	tok;			/* token type (attribute type)	*/
	int	val;			/* symbol number of value	*/
{
	char	*c;
	dvptr	s;

	if (devs == NIL)		/* doing types			*/
		s = currtype;
	else
		s = lastdv;
	if (val>=0 && val<nsym) {
		c = symtab[val].symname;
		if (strlen(c) > 20 ) {
			fprintf(stderr,"Internal overflow\n");
			exit(1);
		}
	} else
		c = NULL;

	switch (tok) {

	case CSR:	s->dvcsr = (void *)val;
			break;
	case IVEC:	s->dvivec = val;
			break;
	case OVEC:	s->dvovec = val;
			break;
	case IRQ:	s->dvovec = s->dvivec = val;
			break;
	case IINT:	strcpy(s->dviint,c);
			break;
	case OINT:	strcpy(s->dvoint,c);
			break;
	case READ:	strcpy(s->dvread,c);
			break;
	case WRITE:	strcpy(s->dvwrite,c);
			break;
	case GETC:	strcpy(s->dvgetc,c);
			break;
	case PUTC:	strcpy(s->dvputc,c);
			break;
	case OPEN:	strcpy(s->dvopen,c);
			break;
	case CLOSE:	strcpy(s->dvclose,c);
			break;
	case INIT:	strcpy(s->dvinit,c);
			break;
	case SEEK:	strcpy(s->dvseek,c);
			break;
	case CNTL:	strcpy(s->dvcntl,c);
			break;
	default:	fprintf(stderr, "Internal error 1\n");
	}
}

/* cktname  --  check type name for duplicates */

cktname(symid)
	int symid;
{
	dvptr	s;
extern	dvptr	ftypes;
	char	*name;

	name = symtab[symid].symname;
	for (s=ftypes; s!=NIL ; s=s->dvnext) {
		if (s->dvtname == name) {
			fprintf(stderr,"Duplicate type name %s on line %d\n",
				name,linectr);
			exit(1);
			}
		}
	return(symid);
}

/* mktype  --  make a node in the type list and initialize to defaults	*/

mktype(int deviceid)
{
	dvptr	s,p;
	char	*tn,*dn;

	p = NIL;
	tn = symtab[currtname].symname;
	dn = symtab[deviceid].symname;
	for (s = ftypes; s!=NIL ; s=s->dvnext) {
		if (s->dvtname == tn && s->dvdevice==dn) {
		   fprintf(stderr,
		     "Duplicate device %s for type %s on line %d\n",
		     dn, tn, linectr);
		   exit(1);
		}
		p = s;
	}
	currtype = s = (dvptr) malloc( sizeof(struct dvtype));
	if (ftypes != NIL) {
		p->dvnext = s;
	}
	else {
		ftypes = s;
	}
	initattr(s, currtname, deviceid);
}

/* initialize attributes in a type declaration node to typename...	*/

initattr(fstr, tnum, deviceid)
	dvptr	fstr;
	int	tnum;
	int	deviceid;
{
	char	*typnam;

	typnam = symtab[tnum].symname;
	fstr->dvname = NULL;
	fstr->dvtname = typnam;
	fstr->dvtnum = tnum;
	fstr->dvdevice = symtab[deviceid].symname;
	fstr->dvcsr = 0;
	fstr->dvivec = 0;
	fstr->dvovec = 0;
	strcpy(fstr->dviint,typnam);
	strcat(fstr->dviint,"iin");
	strcpy(fstr->dvoint,typnam);
	strcat(fstr->dvoint,"oin");
	strcpy(fstr->dvinit,typnam);
	strcat(fstr->dvinit,"init");
	strcpy(fstr->dvopen,typnam);
	strcat(fstr->dvopen,"open");
	strcpy(fstr->dvclose,typnam);
	strcat(fstr->dvclose,"close");
	strcpy(fstr->dvread,typnam);
	strcat(fstr->dvread,"read");
	strcpy(fstr->dvwrite,typnam);
	strcat(fstr->dvwrite,"write");
	strcpy(fstr->dvcntl,typnam);
	strcat(fstr->dvcntl,"control");
	strcpy(fstr->dvseek,typnam);
	strcat(fstr->dvseek,"seek");
	strcpy(fstr->dvgetc,typnam);
	strcat(fstr->dvgetc,"getc");
	strcpy(fstr->dvputc,typnam);
	strcat(fstr->dvputc,"putc");
	fstr->dvminor = 0;
}

/* mkdev  --  make a node on the device list */

mkdev(nameid, typid, deviceid)
	int	nameid, typid, deviceid;
{
	dvptr	s;
	char	*devn,*tn,*dn;
	int	found;

	s = (dvptr) malloc(sizeof(struct dvtype));
	s->dvnext = NIL;
	if (devs == NIL) {
		devs = s;
		lastdv = s;
	} else {
		lastdv->dvnext = s;
		lastdv = s;
	}
	ndevs++;
	tn = symtab[typid].symname;
	devn = symtab[nameid].symname;
	if (deviceid >= 0)
		dn = symtab[deviceid].symname;
	else
		dn = NULL;
	found = 0;
	for (s=ftypes ; s != NULL ; s=s->dvnext)
		if (s->dvtname == tn && (dn==NULL || s->dvdevice==dn)) {
			strdup(lastdv,s,sizeof(struct dvtype));
			found=1;
			break;
		}
	if (found==0) {
		fprintf(stderr,
		  "Bad type or device name in declaration of %s on line %d\n",
		  devn, linectr);
		exit(1);
	}
	lastdv->dvnext = NIL;
	lastdv->dvname = devn;
}


/* chdname  -- check for duplicate device name */

ckdname(devid)
	int devid;
{
	dvptr	s;
extern	dvptr	devs;
	char	*name;

	name = symtab[devid].symname;
	for (s=devs; s!=NIL ; s=s->dvnext) {
		if (s->dvname == name) {
			fprintf(stderr,"Duplicate device name %s on line %d\n",
				name,linectr);
			exit(1);
			}
		}
	return(devid);
}

strdup(tostr,fromstr,len)
	char	*tostr, *fromstr;
	int	len;
{
	for( ; len > 0 ; len--)
		*tostr++ = *fromstr++;
}

prdef(FILE *fp, char *name, int typ)
{
	/* special case for the everything function */
	if (strcmp(name, "ioerr") == 0) {
		fprintf(fp, "extern\tvoid\tioerr(void);\n");
		return;
	}
	switch (typ) {
	case IINT:
		fprintf(fp, "extern\tvoid\t%s(struct devsw *, unsigned char);\n", name);
		break;
	case OINT:
		fprintf(fp, "extern\tvoid\t%s(struct devsw *);\n", name);
		break;
	case READ:
		fprintf(fp, "extern\tint\t%s(struct devsw *, char *, unsigned);\n", name);
		break;
	case WRITE:
		fprintf(fp, "extern\tint\t%s(struct devsw *, unsigned char *, unsigned);\n", name);
		break;
	case GETC:
		fprintf(fp, "extern\tint\t%s(struct devsw *);\n", name);
		break;
	case PUTC:
		fprintf(fp, "extern\tint\t%s(struct devsw *, unsigned char);\n",
			name);
		break;
	case OPEN:
		fprintf(fp, "extern\tint\t%s(struct devsw *, void *, void *);\n", name);
		break;
	case CLOSE:
		fprintf(fp, "extern\tint\t%s(struct devsw *);\n", name);
		break;
	case INIT:
		fprintf(fp, "extern\tint\t%s(struct devsw *);\n", name);
		break;
	case SEEK:
		fprintf(fp, "extern\tint\t%s(struct devsw *, long);\n", name);
		break;
	case CNTL:
		fprintf(fp, "extern\tint\t%s(struct devsw *, int, void *, void *);\n",
			name);
		break;
	default:	fprintf(stderr, "Internal error 1\n");
	}
}