Move dumpcis to its own directory, start to decouple from the

pccardc/pccardd history.

1 files changed, 790 insertions, 0 deletions

diff --git a/usr.sbin/dumpcis/readcis.c b/usr.sbin/dumpcis/readcis.c
new file mode 100644
index 0000000..73b72ef
--- /dev/null
+++ b/usr.sbin/dumpcis/readcis.c
@@ -0,0 +1,790 @@
+/*
+ * Copyright (c) 1995 Andrew McRae.  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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without 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.
+ */
+
+#ifndef lint
+static const char rcsid[] =
+  "$FreeBSD$";
+#endif /* not lint */
+
+/*
+ * Code cleanup, bug-fix and extension
+ * by Tatsumi Hosokawa <hosokawa@mt.cs.keio.ac.jp>
+ */
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#include <pccard/cardinfo.h>
+#include <pccard/cis.h>
+
+#include "readcis.h"
+
+#ifdef RATOCLAN
+static int	rex5588 = 0;
+#endif
+int isdumpcisfile = 0;
+
+static int read_attr(int, char *, int);
+static int ck_linktarget(int, off_t, int);
+static void cis_info(struct cis *, unsigned char *, int);
+static void device_desc(unsigned char *, int, struct dev_mem *);
+static void config_map(struct cis *, unsigned char *, int);
+static void cis_config(struct cis *, unsigned char *, int);
+static void cis_manuf_id(struct cis *, unsigned char *, int);
+static void cis_func_id(struct cis *, unsigned char *, int);
+static void cis_network_ext(struct cis *, unsigned char *, int);
+static struct tuple_list *read_one_tuplelist(int, int, off_t);
+static struct tuple_list *read_tuples(int);
+static struct tuple *find_tuple_in_list(struct tuple_list *, unsigned char);
+static struct tuple_info *get_tuple_info(unsigned char);
+
+static struct tuple_info tuple_info[] = {
+	{"Null tuple", 0x00, 0},
+	{"Common memory descriptor", 0x01, 255},
+	{"Long link to next chain for CardBus", 0x02, 255},
+	{"Indirect access", 0x03, 255},
+	{"Configuration map for CardBus", 0x04, 255},
+	{"Configuration entry for CardBus", 0x05, 255},
+	{"Long link to next chain for MFC", 0x06, 255},
+	{"Base address register for CardBus", 0x07, 6},
+	{"Checksum", 0x10, 5},
+	{"Long link to attribute memory", 0x11, 4},
+	{"Long link to common memory", 0x12, 4},
+	{"Link target", 0x13, 3},
+	{"No link", 0x14, 0},
+	{"Version 1 info", 0x15, 255},
+	{"Alternate language string", 0x16, 255},
+	{"Attribute memory descriptor", 0x17, 255},
+	{"JEDEC descr for common memory", 0x18, 255},
+	{"JEDEC descr for attribute memory", 0x19, 255},
+	{"Configuration map", 0x1A, 255},
+	{"Configuration entry", 0x1B, 255},
+	{"Other conditions for common memory", 0x1C, 255},
+	{"Other conditions for attribute memory", 0x1D, 255},
+	{"Geometry info for common memory", 0x1E, 255},
+	{"Geometry info for attribute memory", 0x1F, 255},
+	{"Manufacturer ID", 0x20, 4},
+	{"Functional ID", 0x21, 2},
+	{"Functional EXT", 0x22, 255},
+	{"Software interleave", 0x23, 2},
+	{"Version 2 Info", 0x40, 255},
+	{"Data format", 0x41, 255},
+	{"Geometry", 0x42, 4},
+	{"Byte order", 0x43, 2},
+	{"Card init date", 0x44, 4},
+	{"Battery replacement", 0x45, 4},
+	{"Organization", 0x46, 255},
+	{"Terminator", 0xFF, 0},
+	{0, 0, 0}
+};
+
+/*
+ *	After reading the tuples, decode the relevant ones.
+ */
+struct cis *
+readcis(int fd)
+{
+	struct tuple_list *tl;
+	struct tuple *tp;
+	struct cis *cp;
+
+	cp = xmalloc(sizeof(*cp));
+	cp->tlist = read_tuples(fd);
+	if (cp->tlist == 0)
+		return (NULL);
+
+	for (tl = cp->tlist; tl; tl = tl->next)
+		for (tp = tl->tuples; tp; tp = tp->next) {
+#if 0
+			printf("tuple code = 0x%02x, data is\n", tp->code);
+			dump(tp->data, tp->length);
+#endif
+			switch (tp->code) {
+			case CIS_MEM_COMMON:	/* 0x01 */
+				device_desc(tp->data, tp->length, &cp->common_mem);
+				break;
+			case CIS_INFO_V1:	/* 0x15 */
+				cis_info(cp, tp->data, tp->length);
+				break;
+			case CIS_MEM_ATTR:	/* 0x17 */
+				device_desc(tp->data, tp->length, &cp->attr_mem);
+				break;
+			case CIS_CONF_MAP:	/* 0x1A */
+				config_map(cp, tp->data, tp->length);
+				break;
+			case CIS_CONFIG:	/* 0x1B */
+				cis_config(cp, tp->data, tp->length);
+				break;
+			case CIS_MANUF_ID:	/* 0x20 */
+				cis_manuf_id(cp, tp->data, tp->length);
+				break;
+			case CIS_FUNC_ID:	/* 0x21 */
+				cis_func_id(cp, tp->data, tp->length);
+				break;
+			case CIS_FUNC_EXT:	/* 0x22 */
+				if (cp->func_id1 == 6)	/* LAN adaptor */
+					cis_network_ext(cp, tp->data, tp->length);
+				break;
+			}
+		}
+	return (cp);
+}
+
+/*
+ *	free_cis - delete cis entry.
+ */
+void
+freecis(struct cis *cp)
+{
+	struct cis_ioblk *io;
+	struct cis_memblk *mem;
+	struct cis_config *conf;
+	struct tuple *tp;
+	struct tuple_list *tl;
+
+	while ((tl = cp->tlist) != 0) {
+		cp->tlist = tl->next;
+		while ((tp = tl->tuples) != 0) {
+			tl->tuples = tp->next;
+			if (tp->data)
+				free(tp->data);
+		}
+	}
+
+	while ((conf = cp->conf) != 0) {
+		cp->conf = conf->next;
+		while ((io = conf->io) != 0) {
+			conf->io = io->next;
+			free(io);
+		}
+		while ((mem = conf->mem) != 0) {
+			conf->mem = mem->next;
+			free(mem);
+		}
+		free(conf);
+	}
+	free(cp);
+}
+
+/*
+ *	Fills in CIS version data.
+ */
+static void
+cis_info(struct cis *cp, unsigned char *p, int len)
+{
+	cp->maj_v = *p++;
+	cp->min_v = *p++;
+	len -= 2;
+	if (cp->manuf) {
+		free(cp->manuf);
+		cp->manuf = NULL;
+	}
+	if (len > 1 && *p != 0xff) {
+		cp->manuf = strdup(p);
+		len -= strlen(p) + 1;
+		p += strlen(p) + 1;
+	}
+	if (cp->vers) {
+		free(cp->vers);
+		cp->vers = NULL;
+	}
+	if (len > 1 && *p != 0xff) {
+		cp->vers = strdup(p);
+		len -= strlen(p) + 1;
+		p += strlen(p) + 1;
+	} else {
+		cp->vers = strdup("[none]");
+	}
+	if (cp->add_info1) {
+		free(cp->add_info1);
+		cp->add_info1 = NULL;
+	}
+	if (len > 1 && *p != 0xff) {
+		cp->add_info1 = strdup(p);
+		len -= strlen(p) + 1;
+		p += strlen(p) + 1;
+	} else {
+		cp->add_info1 = strdup("[none]");
+	}
+	if (cp->add_info2) {
+		free(cp->add_info2);
+		cp->add_info2 = NULL;
+	}
+	if (len > 1 && *p != 0xff)
+		cp->add_info2 = strdup(p);
+	else
+		cp->add_info2 = strdup("[none]");
+}
+
+static void
+cis_manuf_id(struct cis *cp, unsigned char *p, int len)
+{
+	if (len >= 4) {
+		cp->manufacturer = tpl16(p);
+		cp->product = tpl16(p+2);
+		if (len == 5)
+			cp->prodext = *(p+4); /* For xe driver */
+	} else {
+		cp->manufacturer=0;
+		cp->product=0;
+		cp->prodext=0;
+	}
+}
+/*
+ *	Fills in CIS function ID.
+ */
+static void
+cis_func_id(struct cis *cp, unsigned char *p, int len)
+{
+	cp->func_id1 = *p++;
+	cp->func_id2 = *p++;
+}
+
+static void
+cis_network_ext(struct cis *cp, unsigned char *p, int len)
+{
+	int i;
+
+	switch (p[0]) {
+	case 4:		/* Node ID */
+		if (len <= 2 || len < p[1] + 2)
+			return;
+
+		if (cp->lan_nid)
+			free(cp->lan_nid);
+		cp->lan_nid = xmalloc(p[1]);
+
+		for (i = 0; i <= p[1]; i++)
+			cp->lan_nid[i] = p[i + 1];
+		break;
+	}
+}
+
+/*
+ *	"FUJITSU LAN Card (FMV-J182)" has broken CIS
+ */
+static int
+fmvj182_check(unsigned char *p)
+{
+	char    manuf[BUFSIZ], vers[BUFSIZ];
+
+	p++;			/* major version */
+	p++;			/* minor version */
+	strncpy(manuf, p, sizeof(manuf) - 1);
+	while (*p++);
+	strncpy(vers, p, sizeof(vers) - 1);
+	if (!strcmp(manuf, "FUJITSU") && !strcmp(vers, "LAN Card(FMV-J182)"))
+		return 1;
+	else
+		return 0;
+}
+
+#ifdef RATOCLAN
+/*
+ *	"RATOC LAN Card (REX-5588)" has broken CIS
+ */
+static int
+rex5588_check(unsigned char *p)
+{
+	char    manuf[BUFSIZ], vers[BUFSIZ];
+
+	p++;			/* major version */
+	p++;			/* minor version */
+	strncpy(manuf, p, sizeof(manuf) - 1);
+	while (*p++);
+	strncpy(vers, p, sizeof(manuf) - 1);
+	if (!strcmp(manuf, "PCMCIA LAN MBH10304  ES"))
+		return 1;
+	else
+		return 0;
+}
+#endif
+
+#ifdef HSSYNTH
+/*
+ *	Broken CIS for "HITACHI MICROCOMPUTER SYSTEM LTD." "MSSHVPC02"
+ */
+static int
+hss_check(unsigned char *p)
+{
+	char    manuf[BUFSIZ], vers[BUFSIZ];
+
+	p++;			/* major version */
+	p++;			/* minor version */
+	strncpy(manuf, p, sizeof(manuf) - 1);
+	while (*p++);
+	strncpy(vers, p, sizeof(vers) - 1);
+	if (!strcmp(manuf, "HITACHI MICROCOMPUTER SYSTEMS LTD.")
+	 && !strcmp(vers, "MSSHVPC02"))
+		return 1;
+	else
+		return 0;
+}
+#endif	/* HSSYNTH */
+
+/*
+ *	device_desc - decode device descriptor.
+ */
+static void
+device_desc(unsigned char *p, int len, struct dev_mem *dp)
+{
+	while (len > 0 && *p != 0xFF) {
+		dp->valid = 1;
+		dp->type = (*p & 0xF0) >> 4;
+		dp->wps = !!(*p & 0x8);
+		dp->speed = *p & 7;
+		p++;
+		if (*p != 0xFF) {
+			dp->addr = (*p >> 3) & 0xF;
+			dp->units = *p & 7;
+		}
+		p++;
+		len -= 2;
+	}
+}
+
+/*
+ *	configuration map of card control register.
+ */
+static void
+config_map(struct cis *cp, unsigned char *p, int len)
+{
+	unsigned char *p1;
+	int rlen = (*p & 3) + 1;
+
+	p1 = p + 1;
+	cp->last_config = *p1++ & 0x3F;
+	cp->reg_addr = parse_num(rlen | 0x10, p1, &p1, 0);
+	cp->ccrs = *p1;
+}
+
+/*
+ *	Parse variable length value.
+ */
+u_int
+parse_num(int sz, u_char *p, u_char **q, int ofs)
+{
+	u_int num = 0;
+
+	switch (sz) {	
+	case 0:
+	case 0x10:
+		break;
+	case 1:
+	case 0x11:
+		num = (*p++) + ofs;
+		break;
+	case 2:
+	case 0x12:
+		num = tpl16(p) + ofs;
+		p += 2;
+		break;
+	case 0x13:
+		num = tpl24(p) + ofs;
+		p += 3;
+		break;
+	case 3:
+	case 0x14:
+		num = tpl32(p) + ofs;
+		p += 4;
+		break;
+	}
+	if (q)
+		*q = p;
+	return num;
+}
+
+/*
+ *	CIS config entry - Decode and build configuration entry.
+ */
+static void
+cis_config(struct cis *cp, unsigned char *p, int len)
+{
+	int     x;
+	int     i, j;
+	struct cis_config *conf, *last;
+	unsigned char feat;
+
+	conf = xmalloc(sizeof(*conf));
+	if ((last = cp->conf) != 0) {
+		while (last->next)
+			last = last->next;
+		last->next = conf;
+	} else
+		cp->conf = conf;
+ 	conf->id = *p & 0x3F;	/* Config index */
+#ifdef RATOCLAN
+	if (rex5588 && conf->id >= 0x08 && conf->id <= 0x1d)
+		conf->id |= 0x20;
+#endif
+ 	if (*p & 0x40)		/* Default flag */
+		cp->def_config = conf;
+	if (*p++ & 0x80)
+ 		p++;		/* Interface byte skip */
+ 	feat = *p++;		/* Features byte */
+	for (i = 0; i < CIS_FEAT_POWER(feat); i++) {
+		unsigned char parms = *p++;
+
+		conf->pwr = 1;
+		for (j = 0; j < 8; j++)
+			if (parms & (1 << j))
+				while (*p++ & 0x80);
+	}
+	if (feat & CIS_FEAT_TIMING) {
+		conf->timing = 1;
+		i = *p++;
+		if (CIS_WAIT_SCALE(i) != 3)
+			p++;
+		if (CIS_READY_SCALE(i) != 7)
+			p++;
+		if (CIS_RESERVED_SCALE(i) != 7)
+			p++;
+	}
+	if (feat & CIS_FEAT_I_O) {
+		conf->iospace = 1;
+		if (CIS_IO_RANGE & *p)
+			conf->io_blks = CIS_IO_BLKS(p[1]) + 1;
+		conf->io_addr = CIS_IO_ADDR(*p);
+		conf->io_bus = (*p >> 5) & 3; /* CIS_IO_8BIT | CIS_IO_16BIT */
+		if (*p++ & CIS_IO_RANGE) {
+			struct cis_ioblk *io;
+			struct cis_ioblk *last_io = NULL;
+
+			i = CIS_IO_ADSZ(*p);
+			j = CIS_IO_BLKSZ(*p++);
+			for (x = 0; x < conf->io_blks; x++) {
+				io = xmalloc(sizeof(*io));
+				if (last_io)
+					last_io->next = io;
+				else
+					conf->io = io;
+				last_io = io;
+				io->addr = parse_num(i, p, &p, 0);
+				io->size = parse_num(j, p, &p, 1);
+			}
+		}
+	}
+	if (feat & CIS_FEAT_IRQ) {
+		conf->irq = 1;
+		conf->irqlevel = *p & 0xF;
+		conf->irq_flags = *p & 0xF0;
+		if (*p++ & CIS_IRQ_MASK) {
+			conf->irq_mask = tpl16(p);
+			p += 2;
+		}
+	}
+	switch (CIS_FEAT_MEMORY(feat)) {
+	case CIS_FEAT_MEM_NONE:
+		break;
+	case CIS_FEAT_MEM_LEN:
+		conf->memspace = 1;
+		conf->mem = xmalloc(sizeof(*conf->mem));
+		conf->mem->length = tpl16(p) << 8;
+		break;
+	case CIS_FEAT_MEM_ADDR:
+		conf->memspace = 1;
+		conf->mem = xmalloc(sizeof(*conf->mem));
+		conf->mem->length = tpl16(p) << 8;
+		conf->mem->address = tpl16(p + 2) << 8;
+		break;
+	case CIS_FEAT_MEM_WIN: {
+		struct cis_memblk *mem;
+		struct cis_memblk *last_mem = NULL;
+
+		conf->memspace = 1;
+		x = *p++;
+		conf->memwins = CIS_MEM_WINS(x);
+		for (i = 0; i < conf->memwins; i++) {
+			mem = xmalloc(sizeof(*mem));
+			if (last_mem)
+				last_mem->next = mem;
+			else
+				conf->mem = mem;
+			last_mem = mem;
+			mem->length = parse_num(CIS_MEM_LENSZ(x) | 0x10, p, &p, 0) << 8;
+			mem->address = parse_num(CIS_MEM_ADDRSZ(x) | 0x10, p, &p, 0) << 8;
+			if (x & CIS_MEM_HOST) {
+				mem->host_address = parse_num(CIS_MEM_ADDRSZ(x) | 0x10,
+							      p, &p, 0) << 8;
+			}
+		}
+		break;
+	    }
+	}
+	if (feat & CIS_FEAT_MISC) {
+		conf->misc_valid = 1;
+		conf->misc = *p++;
+	}
+}
+
+/*
+ *	Read the tuples from the card.
+ *	The processing of tuples is as follows:
+ *		- Read tuples at attribute memory, offset 0.
+ *		- If a CIS_END is the first tuple, look for
+ *		  a tuple list at common memory offset 0; this list
+ *		  must start with a LINKTARGET.
+ *		- If a long link tuple was encountered, execute the long
+ *		  link.
+ *		- If a no-link tuple was seen, terminate processing.
+ *		- If no no-link tuple exists, and no long link tuple
+ *		  exists while processing the primary tuple list,
+ *		  then look for a LINKTARGET tuple in common memory.
+ *		- If a long link tuple is found in any list, then process
+ *		  it. Only one link is allowed per list.
+ */
+static struct tuple_list *tlist;
+
+static struct tuple_list *
+read_tuples(int fd)
+{
+	struct tuple_list *tl = 0, *last_tl;
+	struct tuple *tp;
+	int     flag;
+	off_t   offs;
+
+	tlist = 0;
+	last_tl = tlist = read_one_tuplelist(fd, MDF_ATTR, (off_t) 0);
+
+	/* Now start processing the links (if any). */
+	do {
+		flag = MDF_ATTR;
+		tp = find_tuple_in_list(last_tl, CIS_LONGLINK_A);
+		if (tp == 0) {
+			flag = 0;
+			tp = find_tuple_in_list(last_tl, CIS_LONGLINK_C);
+		}
+		if (tp && tp->length == 4) {
+			offs = tpl32(tp->data);
+#ifdef	DEBUG
+			printf("Checking long link at %qd (%s memory)\n",
+			    offs, flag ? "Attribute" : "Common");
+#endif
+			/* If a link was found, read the tuple list from it. */
+			if (ck_linktarget(fd, offs, flag)) {
+				tl = read_one_tuplelist(fd, flag, offs);
+				last_tl->next = tl;
+				last_tl = tl;
+			}
+		} else
+			tl = 0;
+	} while (tl);
+
+	/*
+	 * If the primary list had no NOLINK tuple, and no LINKTARGET,
+	 * then try to read a tuple list at common memory (offset 0).
+	 */
+	if (find_tuple_in_list(tlist, CIS_NOLINK) == 0 && tlist->next == 0 &&
+	    ck_linktarget(fd, (off_t) 0, 0)) {
+#ifdef	DEBUG
+		printf("Reading long link at %qd (%s memory)\n",
+		    offs, flag ? "Attribute" : "Common");
+#endif
+		tlist->next = read_one_tuplelist(fd, 0, (off_t) 0);
+	}
+	return (tlist);
+}
+
+/*
+ *	Read one tuple list from the card.
+ */
+static struct tuple_list *
+read_one_tuplelist(int fd, int flags, off_t offs)
+{
+	struct tuple *tp, *last_tp = 0;
+	struct tuple_list *tl;
+	struct tuple_info *tinfo;
+	int     total = 0;
+	unsigned char code, length;
+	int     fmvj182 = 0;
+#ifdef HSSYNTH
+	int     hss = 0;
+#endif	/* HSSYNTH */
+
+	/* Check to see if this memory has already been scanned. */
+	for (tl = tlist; tl; tl = tl->next)
+		if (tl->offs == offs && tl->flags == (flags & MDF_ATTR))
+			return (0);
+	tl = xmalloc(sizeof(*tl));
+	tl->offs = offs;
+	tl->flags = flags & MDF_ATTR;
+	ioctl(fd, PIOCRWFLAG, &flags);
+	lseek(fd, offs, SEEK_SET);
+	do {
+		if (read_attr(fd, &code, 1) != 1) {
+			warn("CIS code read");
+			break;
+		}
+		total++;
+		if (code == CIS_NULL)
+			continue;
+		tp = xmalloc(sizeof(*tp));
+		tp->code = code;
+		if (code == CIS_END)
+			length = 0;
+		else {
+			if (read_attr(fd, &length, 1) != 1) {
+				warn("CIS len read");
+				break;
+			}
+			total++;
+			if (fmvj182 && (code == 0x1b) && (length == 25))
+				length = 31;
+		}
+		tp->length = length;
+#ifdef	DEBUG
+		printf("Tuple code = 0x%x, len = %d\n", code, length);
+#endif
+		if (length == 0xFF) {
+			length = tp->length = 0;
+			code = CIS_END;
+		}
+		if (length != 0) {
+			total += length;
+			tp->data = xmalloc(length);
+			if (read_attr(fd, tp->data, length) != length) {
+				warn("CIS read");
+				break;
+			}
+		}
+
+		/*
+		 * Check the tuple, and ignore it if it isn't in the table
+		 * or the length is illegal.
+		 */
+		tinfo = get_tuple_info(code);
+		if (code == CIS_INFO_V1) {
+			/* Hack for broken CIS of FMV-J182 Ethernet card */
+			fmvj182 = fmvj182_check(tp->data);
+#ifdef RATOCLAN
+			/* Hack for RATOC LAN card */
+			rex5588 = rex5588_check(tp->data);
+#endif /* RATOCLAN */
+#ifdef	HSSYNTH
+			/* Hack for Hitachi Speech Synthesis card */
+			hss = hss_check(tp->data);
+#endif	/* HSSYNTH */
+		}
+		if (tinfo != NULL && (tinfo->length != 255 && tinfo->length > length)) {
+			printf("code %s ignored\n", tuple_name(code));
+			tp->code = CIS_NULL;
+		}
+		if (tl->tuples == NULL)
+			tl->tuples = tp;
+		else
+			last_tp->next = tp;
+		last_tp = tp;
+	} while (code != CIS_END && total < 1024);
+	return (tl);
+}
+
+/*
+ *	return true if the offset points to a LINKTARGET tuple.
+ */
+static int
+ck_linktarget(int fd, off_t offs, int flag)
+{
+	char    blk[5];
+
+	ioctl(fd, PIOCRWFLAG, &flag);
+	lseek(fd, offs, SEEK_SET);
+	if (read_attr(fd, blk, 5) != 5)
+		return (0);
+	if (blk[0] == 0x13 &&
+	    blk[1] == 0x3 &&
+	    blk[2] == 'C' &&
+	    blk[3] == 'I' &&
+	    blk[4] == 'S')
+		return (1);
+	return (0);
+}
+
+/*
+ *	find_tuple_in_list - find a tuple within a
+ *	single tuple list.
+ */
+static struct tuple *
+find_tuple_in_list(struct tuple_list *tl, unsigned char code)
+{
+	struct tuple *tp;
+
+	for (tp = tl->tuples; tp; tp = tp->next)
+		if (tp->code == code)
+			break;
+	return (tp);
+}
+
+static int
+read_attr(int fd, char *bp, int len)
+{
+	char    blk[1024], *p = blk;
+	int     i, l;
+	
+	if (isdumpcisfile)
+		return (read(fd, bp, len));
+	if (len > sizeof(blk) / 2)
+		len = sizeof(blk) / 2;
+	l = i = read(fd, blk, len * 2);
+	if (i <= 0) {
+		printf("Read return %d bytes (expected %d)\n", i, len * 2);
+		return (i);
+	}
+	while (i > 0) {
+		*bp++ = *p++;
+		p++;
+		i -= 2;
+	}
+	return (l / 2);
+}
+
+/*
+ *	return table entry for code.
+ */
+static struct tuple_info *
+get_tuple_info(unsigned char code)
+{
+	struct tuple_info *tp;
+
+	for (tp = tuple_info; tp->name; tp++)
+		if (tp->code == code)
+			return (tp);
+	return (0);
+}
+
+char *
+tuple_name(unsigned char code)
+{
+	struct tuple_info *tp;
+
+	tp = get_tuple_info(code);
+	if (tp)
+		return (tp->name);
+	return ("Unknown");
+}