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freebsd-dev/lib/libmt/mtlib.c
Kenneth D. Merry 70a8349311 Add the LTO-8 Type M density code (0x5d, LTO-8M) to libmt and the 
mt(1) man page.

LTO-8 Type M (also known as M8) is a pristine LTO-7 cartridge
formatted in a LTO-8 drive in a new, higher density format.  It
has a separate density code, and is only readable in an LTO-8
drive.

lib/libmt/mtlib.c:
	Add the LTO-8 Type M density code to the density table
	in libmt.

usr.bin/mt/mt.1:
	Add the LTO-8 Type M density code to the density
	table in the mt(1) man page.

MFC after:	3 days
Sponsored by:	Spectra Logic
2017-11-03 21:04:22 +00:00

779 lines
20 KiB
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/*-
* Copyright (c) 2013, 2014, 2015 Spectra Logic Corporation
* 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,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*
* Authors: Ken Merry (Spectra Logic Corporation)
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <errno.h>
#include <bsdxml.h>
#include <mtlib.h>
/*
* Called at the start of each XML element, and includes the list of
* attributes for the element.
*/
void
mt_start_element(void *user_data, const char *name, const char **attr)
{
int i;
struct mt_status_data *mtinfo;
struct mt_status_entry *entry;
mtinfo = (struct mt_status_data *)user_data;
if (mtinfo->error != 0)
return;
mtinfo->level++;
if ((u_int)mtinfo->level >= (sizeof(mtinfo->cur_sb) /
sizeof(mtinfo->cur_sb[0]))) {
mtinfo->error = 1;
snprintf(mtinfo->error_str, sizeof(mtinfo->error_str),
"%s: too many nesting levels, %zd max", __func__,
sizeof(mtinfo->cur_sb) / sizeof(mtinfo->cur_sb[0]));
return;
}
mtinfo->cur_sb[mtinfo->level] = sbuf_new_auto();
if (mtinfo->cur_sb[mtinfo->level] == NULL) {
mtinfo->error = 1;
snprintf(mtinfo->error_str, sizeof(mtinfo->error_str),
"%s: Unable to allocate sbuf", __func__);
return;
}
entry = malloc(sizeof(*entry));
if (entry == NULL) {
mtinfo->error = 1;
snprintf(mtinfo->error_str, sizeof(mtinfo->error_str),
"%s: unable to allocate %zd bytes", __func__,
sizeof(*entry));
return;
}
bzero(entry, sizeof(*entry));
STAILQ_INIT(&entry->nv_list);
STAILQ_INIT(&entry->child_entries);
entry->entry_name = strdup(name);
mtinfo->cur_entry[mtinfo->level] = entry;
if (mtinfo->cur_entry[mtinfo->level - 1] == NULL) {
STAILQ_INSERT_TAIL(&mtinfo->entries, entry, links);
} else {
STAILQ_INSERT_TAIL(
&mtinfo->cur_entry[mtinfo->level - 1]->child_entries,
entry, links);
entry->parent = mtinfo->cur_entry[mtinfo->level - 1];
}
for (i = 0; attr[i] != NULL; i+=2) {
struct mt_status_nv *nv;
int need_nv;
need_nv = 0;
if (strcmp(attr[i], "size") == 0) {
entry->size = strtoull(attr[i+1], NULL, 0);
} else if (strcmp(attr[i], "type") == 0) {
if (strcmp(attr[i+1], "int") == 0) {
entry->var_type = MT_TYPE_INT;
} else if (strcmp(attr[i+1], "uint") == 0) {
entry->var_type = MT_TYPE_UINT;
} else if (strcmp(attr[i+1], "str") == 0) {
entry->var_type = MT_TYPE_STRING;
} else if (strcmp(attr[i+1], "node") == 0) {
entry->var_type = MT_TYPE_NODE;
} else {
need_nv = 1;
}
} else if (strcmp(attr[i], "fmt") == 0) {
entry->fmt = strdup(attr[i+1]);
} else if (strcmp(attr[i], "desc") == 0) {
entry->desc = strdup(attr[i+1]);
} else {
need_nv = 1;
}
if (need_nv != 0) {
nv = malloc(sizeof(*nv));
if (nv == NULL) {
mtinfo->error = 1;
snprintf(mtinfo->error_str,
sizeof(mtinfo->error_str),
"%s: error allocating %zd bytes",
__func__, sizeof(*nv));
}
bzero(nv, sizeof(*nv));
nv->name = strdup(attr[i]);
nv->value = strdup(attr[i+1]);
STAILQ_INSERT_TAIL(&entry->nv_list, nv, links);
}
}
}
/*
* Called on XML element close.
*/
void
mt_end_element(void *user_data, const char *name)
{
struct mt_status_data *mtinfo;
char *str;
mtinfo = (struct mt_status_data *)user_data;
if (mtinfo->error != 0)
return;
if (mtinfo->cur_sb[mtinfo->level] == NULL) {
mtinfo->error = 1;
snprintf(mtinfo->error_str, sizeof(mtinfo->error_str),
"%s: no valid sbuf at level %d (name %s)", __func__,
mtinfo->level, name);
return;
}
sbuf_finish(mtinfo->cur_sb[mtinfo->level]);
str = strdup(sbuf_data(mtinfo->cur_sb[mtinfo->level]));
if (str == NULL) {
mtinfo->error = 1;
snprintf(mtinfo->error_str, sizeof(mtinfo->error_str),
"%s can't allocate %zd bytes for string", __func__,
sbuf_len(mtinfo->cur_sb[mtinfo->level]));
return;
}
if (strlen(str) == 0) {
free(str);
str = NULL;
}
if (str != NULL) {
struct mt_status_entry *entry;
entry = mtinfo->cur_entry[mtinfo->level];
switch(entry->var_type) {
case MT_TYPE_INT:
entry->value_signed = strtoll(str, NULL, 0);
break;
case MT_TYPE_UINT:
entry->value_unsigned = strtoull(str, NULL, 0);
break;
default:
break;
}
}
mtinfo->cur_entry[mtinfo->level]->value = str;
sbuf_delete(mtinfo->cur_sb[mtinfo->level]);
mtinfo->cur_sb[mtinfo->level] = NULL;
mtinfo->cur_entry[mtinfo->level] = NULL;
mtinfo->level--;
}
/*
* Called to handle character strings in the current element.
*/
void
mt_char_handler(void *user_data, const XML_Char *str, int len)
{
struct mt_status_data *mtinfo;
mtinfo = (struct mt_status_data *)user_data;
if (mtinfo->error != 0)
return;
sbuf_bcat(mtinfo->cur_sb[mtinfo->level], str, len);
}
void
mt_status_tree_sbuf(struct sbuf *sb, struct mt_status_entry *entry, int indent,
void (*sbuf_func)(struct sbuf *sb, struct mt_status_entry *entry,
void *arg), void *arg)
{
struct mt_status_nv *nv;
struct mt_status_entry *entry2;
if (sbuf_func != NULL) {
sbuf_func(sb, entry, arg);
} else {
sbuf_printf(sb, "%*sname: %s, value: %s, fmt: %s, size: %zd, "
"type: %d, desc: %s\n", indent, "", entry->entry_name,
entry->value, entry->fmt, entry->size, entry->var_type,
entry->desc);
STAILQ_FOREACH(nv, &entry->nv_list, links) {
sbuf_printf(sb, "%*snv: name: %s, value: %s\n",
indent + 1, "", nv->name, nv->value);
}
}
STAILQ_FOREACH(entry2, &entry->child_entries, links)
mt_status_tree_sbuf(sb, entry2, indent + 2, sbuf_func, arg);
}
void
mt_status_tree_print(struct mt_status_entry *entry, int indent,
void (*print_func)(struct mt_status_entry *entry, void *arg), void *arg)
{
if (print_func != NULL) {
struct mt_status_entry *entry2;
print_func(entry, arg);
STAILQ_FOREACH(entry2, &entry->child_entries, links)
mt_status_tree_print(entry2, indent + 2, print_func,
arg);
} else {
struct sbuf *sb;
sb = sbuf_new_auto();
if (sb == NULL)
return;
mt_status_tree_sbuf(sb, entry, indent, NULL, NULL);
sbuf_finish(sb);
printf("%s", sbuf_data(sb));
sbuf_delete(sb);
}
}
/*
* Given a parameter name in the form "foo" or "foo.bar.baz", traverse the
* tree looking for the parameter (the first case) or series of parameters
* (second case).
*/
struct mt_status_entry *
mt_entry_find(struct mt_status_entry *entry, char *name)
{
struct mt_status_entry *entry2;
char *tmpname = NULL, *tmpname2 = NULL, *tmpstr = NULL;
tmpname = strdup(name);
if (tmpname == NULL)
goto bailout;
/* Save a pointer so we can free this later */
tmpname2 = tmpname;
tmpstr = strsep(&tmpname, ".");
/*
* Is this the entry we're looking for? Or do we have further
* child entries that we need to grab?
*/
if (strcmp(entry->entry_name, tmpstr) == 0) {
if (tmpname == NULL) {
/*
* There are no further child entries to find. We
* have a complete match.
*/
free(tmpname2);
return (entry);
} else {
/*
* There are more child entries that we need to find.
* Fall through to the recursive search off of this
* entry, below. Use tmpname, which will contain
* everything after the first period.
*/
name = tmpname;
}
}
/*
* Recursively look for further entries.
*/
STAILQ_FOREACH(entry2, &entry->child_entries, links) {
struct mt_status_entry *entry3;
entry3 = mt_entry_find(entry2, name);
if (entry3 != NULL) {
free(tmpname2);
return (entry3);
}
}
bailout:
free(tmpname2);
return (NULL);
}
struct mt_status_entry *
mt_status_entry_find(struct mt_status_data *status_data, char *name)
{
struct mt_status_entry *entry, *entry2;
STAILQ_FOREACH(entry, &status_data->entries, links) {
entry2 = mt_entry_find(entry, name);
if (entry2 != NULL)
return (entry2);
}
return (NULL);
}
void
mt_status_entry_free(struct mt_status_entry *entry)
{
struct mt_status_entry *entry2, *entry3;
struct mt_status_nv *nv, *nv2;
STAILQ_FOREACH_SAFE(entry2, &entry->child_entries, links, entry3) {
STAILQ_REMOVE(&entry->child_entries, entry2, mt_status_entry,
links);
mt_status_entry_free(entry2);
}
free(entry->entry_name);
free(entry->value);
free(entry->fmt);
free(entry->desc);
STAILQ_FOREACH_SAFE(nv, &entry->nv_list, links, nv2) {
STAILQ_REMOVE(&entry->nv_list, nv, mt_status_nv, links);
free(nv->name);
free(nv->value);
free(nv);
}
free(entry);
}
void
mt_status_free(struct mt_status_data *status_data)
{
struct mt_status_entry *entry, *entry2;
STAILQ_FOREACH_SAFE(entry, &status_data->entries, links, entry2) {
STAILQ_REMOVE(&status_data->entries, entry, mt_status_entry,
links);
mt_status_entry_free(entry);
}
}
void
mt_entry_sbuf(struct sbuf *sb, struct mt_status_entry *entry, char *fmt)
{
switch(entry->var_type) {
case MT_TYPE_INT:
if (fmt != NULL)
sbuf_printf(sb, fmt, (intmax_t)entry->value_signed);
else
sbuf_printf(sb, "%jd",
(intmax_t)entry->value_signed);
break;
case MT_TYPE_UINT:
if (fmt != NULL)
sbuf_printf(sb, fmt, (uintmax_t)entry->value_unsigned);
else
sbuf_printf(sb, "%ju",
(uintmax_t)entry->value_unsigned);
break;
default:
if (fmt != NULL)
sbuf_printf(sb, fmt, entry->value);
else
sbuf_printf(sb, "%s", entry->value);
break;
}
}
void
mt_param_parent_print(struct mt_status_entry *entry,
struct mt_print_params *print_params)
{
if (entry->parent != NULL)
mt_param_parent_print(entry->parent, print_params);
if (((print_params->flags & MT_PF_INCLUDE_ROOT) == 0)
&& (strcmp(entry->entry_name, print_params->root_name) == 0))
return;
printf("%s.", entry->entry_name);
}
void
mt_param_parent_sbuf(struct sbuf *sb, struct mt_status_entry *entry,
struct mt_print_params *print_params)
{
if (entry->parent != NULL)
mt_param_parent_sbuf(sb, entry->parent, print_params);
if (((print_params->flags & MT_PF_INCLUDE_ROOT) == 0)
&& (strcmp(entry->entry_name, print_params->root_name) == 0))
return;
sbuf_printf(sb, "%s.", entry->entry_name);
}
void
mt_param_entry_sbuf(struct sbuf *sb, struct mt_status_entry *entry, void *arg)
{
struct mt_print_params *print_params;
print_params = (struct mt_print_params *)arg;
/*
* We don't want to print nodes.
*/
if (entry->var_type == MT_TYPE_NODE)
return;
if ((print_params->flags & MT_PF_FULL_PATH)
&& (entry->parent != NULL))
mt_param_parent_sbuf(sb, entry->parent, print_params);
sbuf_printf(sb, "%s: %s", entry->entry_name, entry->value);
if ((print_params->flags & MT_PF_VERBOSE)
&& (entry->desc != NULL)
&& (strlen(entry->desc) > 0))
sbuf_printf(sb, " (%s)", entry->desc);
sbuf_printf(sb, "\n");
}
void
mt_param_entry_print(struct mt_status_entry *entry, void *arg)
{
struct mt_print_params *print_params;
print_params = (struct mt_print_params *)arg;
/*
* We don't want to print nodes.
*/
if (entry->var_type == MT_TYPE_NODE)
return;
if ((print_params->flags & MT_PF_FULL_PATH)
&& (entry->parent != NULL))
mt_param_parent_print(entry->parent, print_params);
printf("%s: %s", entry->entry_name, entry->value);
if ((print_params->flags & MT_PF_VERBOSE)
&& (entry->desc != NULL)
&& (strlen(entry->desc) > 0))
printf(" (%s)", entry->desc);
printf("\n");
}
int
mt_protect_print(struct mt_status_data *status_data, int verbose)
{
struct mt_status_entry *entry;
const char *prot_name = MT_PROTECTION_NAME;
struct mt_print_params print_params;
snprintf(print_params.root_name, sizeof(print_params.root_name),
MT_PARAM_ROOT_NAME);
print_params.flags = MT_PF_FULL_PATH;
if (verbose != 0)
print_params.flags |= MT_PF_VERBOSE;
entry = mt_status_entry_find(status_data, __DECONST(char *,prot_name));
if (entry == NULL)
return (1);
mt_status_tree_print(entry, 0, mt_param_entry_print, &print_params);
return (0);
}
int
mt_param_list(struct mt_status_data *status_data, char *param_name, int quiet)
{
struct mt_status_entry *entry;
struct mt_print_params print_params;
char root_name[20];
snprintf(root_name, sizeof(root_name), "mtparamget");
strlcpy(print_params.root_name, root_name,
sizeof(print_params.root_name));
print_params.flags = MT_PF_FULL_PATH;
if (quiet == 0)
print_params.flags |= MT_PF_VERBOSE;
if (param_name != NULL) {
entry = mt_status_entry_find(status_data, param_name);
if (entry == NULL)
return (1);
mt_param_entry_print(entry, &print_params);
return (0);
} else {
entry = mt_status_entry_find(status_data, root_name);
STAILQ_FOREACH(entry, &status_data->entries, links)
mt_status_tree_print(entry, 0, mt_param_entry_print,
&print_params);
}
return (0);
}
static struct densities {
int dens;
int bpmm;
int bpi;
const char *name;
} dens[] = {
/*
* Taken from T10 Project 997D
* SCSI-3 Stream Device Commands (SSC)
* Revision 11, 4-Nov-97
*
* LTO 1-6 definitions obtained from the eighth edition of the
* IBM TotalStorage LTO Ultrium Tape Drive SCSI Reference
* (July 2007) and the second edition of the IBM System Storage LTO
* Tape Drive SCSI Reference (February 13, 2013).
*
* IBM 3592 definitions obtained from second edition of the IBM
* System Storage Tape Drive 3592 SCSI Reference (May 25, 2012).
*
* DAT-72 and DAT-160 bpi values taken from "HP StorageWorks DAT160
* tape drive white paper", dated June 2007.
*
* DAT-160 / SDLT220 density code (0x48) conflict information
* found here:
*
* http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c01065117&sp4ts.oid=429311
* (Document ID c01065117)
*/
/*Num. bpmm bpi Reference */
{ 0x1, 32, 800, "X3.22-1983" },
{ 0x2, 63, 1600, "X3.39-1986" },
{ 0x3, 246, 6250, "X3.54-1986" },
{ 0x5, 315, 8000, "X3.136-1986" },
{ 0x6, 126, 3200, "X3.157-1987" },
{ 0x7, 252, 6400, "X3.116-1986" },
{ 0x8, 315, 8000, "X3.158-1987" },
{ 0x9, 491, 37871, "X3.180" },
{ 0xA, 262, 6667, "X3B5/86-199" },
{ 0xB, 63, 1600, "X3.56-1986" },
{ 0xC, 500, 12690, "HI-TC1" },
{ 0xD, 999, 25380, "HI-TC2" },
{ 0xF, 394, 10000, "QIC-120" },
{ 0x10, 394, 10000, "QIC-150" },
{ 0x11, 630, 16000, "QIC-320" },
{ 0x12, 2034, 51667, "QIC-1350" },
{ 0x13, 2400, 61000, "X3B5/88-185A" },
{ 0x14, 1703, 43245, "X3.202-1991" },
{ 0x15, 1789, 45434, "ECMA TC17" },
{ 0x16, 394, 10000, "X3.193-1990" },
{ 0x17, 1673, 42500, "X3B5/91-174" },
{ 0x18, 1673, 42500, "X3B5/92-50" },
{ 0x19, 2460, 62500, "DLTapeIII" },
{ 0x1A, 3214, 81633, "DLTapeIV(20GB)" },
{ 0x1B, 3383, 85937, "DLTapeIV(35GB)" },
{ 0x1C, 1654, 42000, "QIC-385M" },
{ 0x1D, 1512, 38400, "QIC-410M" },
{ 0x1E, 1385, 36000, "QIC-1000C" },
{ 0x1F, 2666, 67733, "QIC-2100C" },
{ 0x20, 2666, 67733, "QIC-6GB(M)" },
{ 0x21, 2666, 67733, "QIC-20GB(C)" },
{ 0x22, 1600, 40640, "QIC-2GB(C)" },
{ 0x23, 2666, 67733, "QIC-875M" },
{ 0x24, 2400, 61000, "DDS-2" },
{ 0x25, 3816, 97000, "DDS-3" },
{ 0x26, 3816, 97000, "DDS-4" },
{ 0x27, 3056, 77611, "Mammoth" },
{ 0x28, 1491, 37871, "X3.224" },
{ 0x40, 4880, 123952, "LTO-1" },
{ 0x41, 3868, 98250, "DLTapeIV(40GB)" },
{ 0x42, 7398, 187909, "LTO-2" },
{ 0x44, 9638, 244805, "LTO-3" },
{ 0x46, 12725, 323215, "LTO-4" },
{ 0x47, 6417, 163000, "DAT-72" },
/*
* XXX KDM note that 0x48 is also the density code for DAT-160.
* For some reason they used overlapping density codes.
*/
#if 0
{ 0x48, 6870, 174500, "DAT-160" },
#endif
{ 0x48, 5236, 133000, "SDLTapeI(110)" },
{ 0x49, 7598, 193000, "SDLTapeI(160)" },
{ 0x4a, 0, 0, "T10000A" },
{ 0x4b, 0, 0, "T10000B" },
{ 0x4c, 0, 0, "T10000C" },
{ 0x4d, 0, 0, "T10000D" },
{ 0x51, 11800, 299720, "3592A1 (unencrypted)" },
{ 0x52, 11800, 299720, "3592A2 (unencrypted)" },
{ 0x53, 13452, 341681, "3592A3 (unencrypted)" },
{ 0x54, 19686, 500024, "3592A4 (unencrypted)" },
{ 0x55, 20670, 525018, "3592A5 (unencrypted)" },
{ 0x56, 20670, 525018, "3592B5 (unencrypted)" },
{ 0x58, 15142, 384607, "LTO-5" },
{ 0x5A, 15142, 384607, "LTO-6" },
{ 0x5C, 19107, 485318, "LTO-7" },
{ 0x5D, 19107, 485318, "LTO-M8" },
{ 0x5E, 20669, 524993, "LTO-8" },
{ 0x71, 11800, 299720, "3592A1 (encrypted)" },
{ 0x72, 11800, 299720, "3592A2 (encrypted)" },
{ 0x73, 13452, 341681, "3592A3 (encrypted)" },
{ 0x74, 19686, 500024, "3592A4 (encrypted)" },
{ 0x75, 20670, 525018, "3592A5 (encrypted)" },
{ 0x76, 20670, 525018, "3592B5 (encrypted)" },
{ 0x8c, 1789, 45434, "EXB-8500c" },
{ 0x90, 1703, 43245, "EXB-8200c" },
{ 0, 0, 0, NULL }
};
const char *
mt_density_name(int density_num)
{
struct densities *sd;
/* densities 0 and 0x7f are handled as special cases */
if (density_num == 0)
return ("default");
if (density_num == 0x7f)
return ("same");
for (sd = dens; sd->dens != 0; sd++)
if (sd->dens == density_num)
break;
if (sd->dens == 0)
return ("UNKNOWN");
return (sd->name);
}
/*
* Given a specific density number, return either the bits per inch or bits
* per millimeter for the given density.
*/
int
mt_density_bp(int density_num, int bpi)
{
struct densities *sd;
for (sd = dens; sd->dens; sd++)
if (sd->dens == density_num)
break;
if (sd->dens == 0)
return (0);
if (bpi)
return (sd->bpi);
else
return (sd->bpmm);
}
int
mt_density_num(const char *density_name)
{
struct densities *sd;
size_t l = strlen(density_name);
for (sd = dens; sd->dens; sd++)
if (strncasecmp(sd->name, density_name, l) == 0)
break;
return (sd->dens);
}
/*
* Get the current status XML string.
* Returns 0 on success, -1 on failure (with errno set, and *xml_str == NULL).
*/
int
mt_get_xml_str(int mtfd, unsigned long cmd, char **xml_str)
{
size_t alloc_len = 32768;
struct mtextget extget;
int error;
*xml_str = NULL;
for (;;) {
bzero(&extget, sizeof(extget));
*xml_str = malloc(alloc_len);
if (*xml_str == NULL)
return (-1);
extget.status_xml = *xml_str;
extget.alloc_len = alloc_len;
error = ioctl(mtfd, cmd, (caddr_t)&extget);
if (error == 0 && extget.status == MT_EXT_GET_OK)
break;
free(*xml_str);
*xml_str = NULL;
if (error != 0 || extget.status != MT_EXT_GET_NEED_MORE_SPACE)
return (-1);
/* The driver needs more space, so double and try again. */
alloc_len *= 2;
}
return (0);
}
/*
* Populate a struct mt_status_data from the XML string via mt_get_xml_str().
*
* Returns XML_STATUS_OK on success.
* If XML_STATUS_ERROR is returned, errno may be set to indicate the reason.
* The caller must check status_data->error.
*/
int
mt_get_status(char *xml_str, struct mt_status_data *status_data)
{
XML_Parser parser;
int retval;
bzero(status_data, sizeof(*status_data));
STAILQ_INIT(&status_data->entries);
parser = XML_ParserCreate(NULL);
if (parser == NULL) {
errno = ENOMEM;
return (XML_STATUS_ERROR);
}
XML_SetUserData(parser, status_data);
XML_SetElementHandler(parser, mt_start_element, mt_end_element);
XML_SetCharacterDataHandler(parser, mt_char_handler);
retval = XML_Parse(parser, xml_str, strlen(xml_str), 1);
XML_ParserFree(parser);
return (retval);
}
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