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xbps/lib/portableproplib/prop_object.c

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/* $NetBSD: prop_object.c,v 1.29 2013/10/18 18:26:20 martin Exp $ */
/*-
* Copyright (c) 2006, 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "prop_object_impl.h"
#include <prop/prop_object.h>
#ifdef _PROP_NEED_REFCNT_MTX
static pthread_mutex_t _prop_refcnt_mtx = PTHREAD_MUTEX_INITIALIZER;
#endif /* _PROP_NEED_REFCNT_MTX */
#define __USE_MISC /* MAP_ANON on glibc */
#include <sys/mman.h>
#undef __USE_MISC
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <zlib.h>
/*
* _prop_object_init --
* Initialize an object. Called when sub-classes create
* an instance.
*/
void
_prop_object_init(struct _prop_object *po, const struct _prop_object_type *pot)
{
po->po_type = pot;
po->po_refcnt = 1;
}
/*
* _prop_object_fini --
* Finalize an object. Called when sub-classes destroy
* an instance.
*/
/*ARGSUSED*/
void
_prop_object_fini(struct _prop_object *po _PROP_ARG_UNUSED)
{
/* Nothing to do, currently. */
}
/*
* _prop_object_externalize_start_tag --
* Append an XML-style start tag to the externalize buffer.
*/
bool
_prop_object_externalize_start_tag(
struct _prop_object_externalize_context *ctx, const char *tag)
{
unsigned int i;
for (i = 0; i < ctx->poec_depth; i++) {
if (_prop_object_externalize_append_char(ctx, '\t') == false)
return (false);
}
if (_prop_object_externalize_append_char(ctx, '<') == false ||
_prop_object_externalize_append_cstring(ctx, tag) == false ||
_prop_object_externalize_append_char(ctx, '>') == false)
return (false);
return (true);
}
/*
* _prop_object_externalize_end_tag --
* Append an XML-style end tag to the externalize buffer.
*/
bool
_prop_object_externalize_end_tag(
struct _prop_object_externalize_context *ctx, const char *tag)
{
if (_prop_object_externalize_append_char(ctx, '<') == false ||
_prop_object_externalize_append_char(ctx, '/') == false ||
_prop_object_externalize_append_cstring(ctx, tag) == false ||
_prop_object_externalize_append_char(ctx, '>') == false ||
_prop_object_externalize_append_char(ctx, '\n') == false)
return (false);
return (true);
}
/*
* _prop_object_externalize_empty_tag --
* Append an XML-style empty tag to the externalize buffer.
*/
bool
_prop_object_externalize_empty_tag(
struct _prop_object_externalize_context *ctx, const char *tag)
{
unsigned int i;
for (i = 0; i < ctx->poec_depth; i++) {
if (_prop_object_externalize_append_char(ctx, '\t') == false)
return (false);
}
if (_prop_object_externalize_append_char(ctx, '<') == false ||
_prop_object_externalize_append_cstring(ctx, tag) == false ||
_prop_object_externalize_append_char(ctx, '/') == false ||
_prop_object_externalize_append_char(ctx, '>') == false ||
_prop_object_externalize_append_char(ctx, '\n') == false)
return (false);
return (true);
}
/*
* _prop_object_externalize_append_cstring --
* Append a C string to the externalize buffer.
*/
bool
_prop_object_externalize_append_cstring(
struct _prop_object_externalize_context *ctx, const char *cp)
{
while (*cp != '\0') {
if (_prop_object_externalize_append_char(ctx,
(unsigned char) *cp) == false)
return (false);
cp++;
}
return (true);
}
/*
* _prop_object_externalize_append_encoded_cstring --
* Append an encoded C string to the externalize buffer.
*/
bool
_prop_object_externalize_append_encoded_cstring(
struct _prop_object_externalize_context *ctx, const char *cp)
{
while (*cp != '\0') {
switch (*cp) {
case '<':
if (_prop_object_externalize_append_cstring(ctx,
"&lt;") == false)
return (false);
break;
case '>':
if (_prop_object_externalize_append_cstring(ctx,
"&gt;") == false)
return (false);
break;
case '&':
if (_prop_object_externalize_append_cstring(ctx,
"&amp;") == false)
return (false);
break;
default:
if (_prop_object_externalize_append_char(ctx,
(unsigned char) *cp) == false)
return (false);
break;
}
cp++;
}
return (true);
}
#define BUF_EXPAND 256
/*
* _prop_object_externalize_append_char --
* Append a single character to the externalize buffer.
*/
bool
_prop_object_externalize_append_char(
struct _prop_object_externalize_context *ctx, unsigned char c)
{
_PROP_ASSERT(ctx->poec_capacity != 0);
_PROP_ASSERT(ctx->poec_buf != NULL);
_PROP_ASSERT(ctx->poec_len <= ctx->poec_capacity);
if (ctx->poec_len == ctx->poec_capacity) {
char *cp = _PROP_REALLOC(ctx->poec_buf,
ctx->poec_capacity + BUF_EXPAND,
M_TEMP);
if (cp == NULL)
return (false);
ctx->poec_capacity = ctx->poec_capacity + BUF_EXPAND;
ctx->poec_buf = cp;
}
ctx->poec_buf[ctx->poec_len++] = c;
return (true);
}
/*
* _prop_object_externalize_header --
* Append the standard XML header to the externalize buffer.
*/
bool
_prop_object_externalize_header(struct _prop_object_externalize_context *ctx)
{
static const char _plist_xml_header[] =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
"<!DOCTYPE plist PUBLIC \"-//Apple Computer//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n";
if (_prop_object_externalize_append_cstring(ctx,
_plist_xml_header) == false ||
_prop_object_externalize_start_tag(ctx,
"plist version=\"1.0\"") == false ||
_prop_object_externalize_append_char(ctx, '\n') == false)
return (false);
return (true);
}
/*
* _prop_object_externalize_footer --
* Append the standard XML footer to the externalize buffer. This
* also NUL-terminates the buffer.
*/
bool
_prop_object_externalize_footer(struct _prop_object_externalize_context *ctx)
{
if (_prop_object_externalize_end_tag(ctx, "plist") == false ||
_prop_object_externalize_append_char(ctx, '\0') == false)
return (false);
return (true);
}
/*
* _prop_object_externalize_context_alloc --
* Allocate an externalize context.
*/
struct _prop_object_externalize_context *
_prop_object_externalize_context_alloc(void)
{
struct _prop_object_externalize_context *ctx;
ctx = _PROP_MALLOC(sizeof(*ctx), M_TEMP);
if (ctx != NULL) {
ctx->poec_buf = _PROP_MALLOC(BUF_EXPAND, M_TEMP);
if (ctx->poec_buf == NULL) {
_PROP_FREE(ctx, M_TEMP);
return (NULL);
}
ctx->poec_len = 0;
ctx->poec_capacity = BUF_EXPAND;
ctx->poec_depth = 0;
}
return (ctx);
}
/*
* _prop_object_externalize_context_free --
* Free an externalize context.
*/
void
_prop_object_externalize_context_free(
struct _prop_object_externalize_context *ctx)
{
/* Buffer is always freed by the caller. */
_PROP_FREE(ctx, M_TEMP);
}
/*
* _prop_object_internalize_skip_comment --
* Skip the body and end tag of a comment.
*/
static bool
_prop_object_internalize_skip_comment(
struct _prop_object_internalize_context *ctx)
{
const char *cp = ctx->poic_cp;
while (!_PROP_EOF(*cp)) {
if (cp[0] == '-' &&
cp[1] == '-' &&
cp[2] == '>') {
ctx->poic_cp = cp + 3;
return (true);
}
cp++;
}
return (false); /* ran out of buffer */
}
/*
* _prop_object_internalize_find_tag --
* Find the next tag in an XML stream. Optionally compare the found
* tag to an expected tag name. State of the context is undefined
* if this routine returns false. Upon success, the context points
* to the first octet after the tag.
*/
bool
_prop_object_internalize_find_tag(struct _prop_object_internalize_context *ctx,
const char *tag, _prop_tag_type_t type)
{
const char *cp;
size_t taglen;
if (tag != NULL)
taglen = strlen(tag);
else
taglen = 0;
start_over:
cp = ctx->poic_cp;
/*
* Find the start of the tag.
*/
while (_PROP_ISSPACE(*cp))
cp++;
if (_PROP_EOF(*cp))
return (false);
if (*cp != '<')
return (false);
ctx->poic_tag_start = cp++;
if (_PROP_EOF(*cp))
return (false);
if (*cp == '!') {
if (cp[1] != '-' || cp[2] != '-')
return (false);
/*
* Comment block -- only allowed if we are allowed to
* return a start tag.
*/
if (type == _PROP_TAG_TYPE_END)
return (false);
ctx->poic_cp = cp + 3;
if (_prop_object_internalize_skip_comment(ctx) == false)
return (false);
goto start_over;
}
if (*cp == '/') {
if (type != _PROP_TAG_TYPE_END &&
type != _PROP_TAG_TYPE_EITHER)
return (false);
cp++;
if (_PROP_EOF(*cp))
return (false);
ctx->poic_tag_type = _PROP_TAG_TYPE_END;
} else {
if (type != _PROP_TAG_TYPE_START &&
type != _PROP_TAG_TYPE_EITHER)
return (false);
ctx->poic_tag_type = _PROP_TAG_TYPE_START;
}
ctx->poic_tagname = cp;
while (!_PROP_ISSPACE(*cp) && *cp != '/' && *cp != '>')
cp++;
if (_PROP_EOF(*cp))
return (false);
ctx->poic_tagname_len = cp - ctx->poic_tagname;
/* Make sure this is the tag we're looking for. */
if (tag != NULL &&
(taglen != ctx->poic_tagname_len ||
memcmp(tag, ctx->poic_tagname, taglen) != 0))
return (false);
/* Check for empty tag. */
if (*cp == '/') {
if (ctx->poic_tag_type != _PROP_TAG_TYPE_START)
return(false); /* only valid on start tags */
ctx->poic_is_empty_element = true;
cp++;
if (_PROP_EOF(*cp) || *cp != '>')
return (false);
} else
ctx->poic_is_empty_element = false;
/* Easy case of no arguments. */
if (*cp == '>') {
ctx->poic_tagattr = NULL;
ctx->poic_tagattr_len = 0;
ctx->poic_tagattrval = NULL;
ctx->poic_tagattrval_len = 0;
ctx->poic_cp = cp + 1;
return (true);
}
_PROP_ASSERT(!_PROP_EOF(*cp));
cp++;
if (_PROP_EOF(*cp))
return (false);
while (_PROP_ISSPACE(*cp))
cp++;
if (_PROP_EOF(*cp))
return (false);
ctx->poic_tagattr = cp;
while (!_PROP_ISSPACE(*cp) && *cp != '=')
cp++;
if (_PROP_EOF(*cp))
return (false);
ctx->poic_tagattr_len = cp - ctx->poic_tagattr;
cp++;
if (*cp != '\"')
return (false);
cp++;
if (_PROP_EOF(*cp))
return (false);
ctx->poic_tagattrval = cp;
while (*cp != '\"')
cp++;
if (_PROP_EOF(*cp))
return (false);
ctx->poic_tagattrval_len = cp - ctx->poic_tagattrval;
cp++;
if (*cp != '>')
return (false);
ctx->poic_cp = cp + 1;
return (true);
}
/*
* _prop_object_internalize_decode_string --
* Decode an encoded string.
*/
bool
_prop_object_internalize_decode_string(
struct _prop_object_internalize_context *ctx,
char *target, size_t targsize, size_t *sizep,
const char **cpp)
{
const char *src;
size_t tarindex;
char c;
tarindex = 0;
src = ctx->poic_cp;
for (;;) {
if (_PROP_EOF(*src))
return (false);
if (*src == '<') {
break;
}
if ((c = *src) == '&') {
if (src[1] == 'a' &&
src[2] == 'm' &&
src[3] == 'p' &&
src[4] == ';') {
c = '&';
src += 5;
} else if (src[1] == 'l' &&
src[2] == 't' &&
src[3] == ';') {
c = '<';
src += 4;
} else if (src[1] == 'g' &&
src[2] == 't' &&
src[3] == ';') {
c = '>';
src += 4;
} else if (src[1] == 'a' &&
src[2] == 'p' &&
src[3] == 'o' &&
src[4] == 's' &&
src[5] == ';') {
c = '\'';
src += 6;
} else if (src[1] == 'q' &&
src[2] == 'u' &&
src[3] == 'o' &&
src[4] == 't' &&
src[5] == ';') {
c = '\"';
src += 6;
} else
return (false);
} else
src++;
if (target) {
if (tarindex >= targsize)
return (false);
target[tarindex] = c;
}
tarindex++;
}
_PROP_ASSERT(*src == '<');
if (sizep != NULL)
*sizep = tarindex;
if (cpp != NULL)
*cpp = src;
return (true);
}
/*
* _prop_object_internalize_match --
* Returns true if the two character streams match.
*/
bool
_prop_object_internalize_match(const char *str1, size_t len1,
const char *str2, size_t len2)
{
return (len1 == len2 && memcmp(str1, str2, len1) == 0);
}
#define INTERNALIZER(t, f) \
{ t, sizeof(t) - 1, f }
static const struct _prop_object_internalizer {
const char *poi_tag;
size_t poi_taglen;
prop_object_internalizer_t poi_intern;
} _prop_object_internalizer_table[] = {
INTERNALIZER("array", _prop_array_internalize),
INTERNALIZER("true", _prop_bool_internalize),
INTERNALIZER("false", _prop_bool_internalize),
INTERNALIZER("data", _prop_data_internalize),
INTERNALIZER("dict", _prop_dictionary_internalize),
INTERNALIZER("integer", _prop_number_internalize),
INTERNALIZER("string", _prop_string_internalize),
{ 0, 0, NULL }
};
#undef INTERNALIZER
/*
* _prop_object_internalize_by_tag --
* Determine the object type from the tag in the context and
* internalize it.
*/
prop_object_t
_prop_object_internalize_by_tag(struct _prop_object_internalize_context *ctx)
{
const struct _prop_object_internalizer *poi;
prop_object_t obj, parent_obj;
void *data, *iter;
prop_object_internalizer_continue_t iter_func;
struct _prop_stack stack;
_prop_stack_init(&stack);
match_start:
for (poi = _prop_object_internalizer_table;
poi->poi_tag != NULL; poi++) {
if (_prop_object_internalize_match(ctx->poic_tagname,
ctx->poic_tagname_len,
poi->poi_tag,
poi->poi_taglen))
break;
}
if ((poi == NULL) || (poi->poi_tag == NULL)) {
while (_prop_stack_pop(&stack, &obj, &iter, &data, NULL)) {
iter_func = (prop_object_internalizer_continue_t)iter;
(*iter_func)(&stack, &obj, ctx, data, NULL);
}
return (NULL);
}
obj = NULL;
if (!(*poi->poi_intern)(&stack, &obj, ctx))
goto match_start;
parent_obj = obj;
while (_prop_stack_pop(&stack, &parent_obj, &iter, &data, NULL)) {
iter_func = (prop_object_internalizer_continue_t)iter;
if (!(*iter_func)(&stack, &parent_obj, ctx, data, obj))
goto match_start;
obj = parent_obj;
}
return (parent_obj);
}
prop_object_t
_prop_generic_internalize(const char *xml, const char *master_tag)
{
prop_object_t obj = NULL;
struct _prop_object_internalize_context *ctx;
ctx = _prop_object_internalize_context_alloc(xml);
if (ctx == NULL)
return (NULL);
/* We start with a <plist> tag. */
if (_prop_object_internalize_find_tag(ctx, "plist",
_PROP_TAG_TYPE_START) == false)
goto out;
/* Plist elements cannot be empty. */
if (ctx->poic_is_empty_element)
goto out;
/*
* We don't understand any plist attributes, but Apple XML
* property lists often have a "version" attribute. If we
* see that one, we simply ignore it.
*/
if (ctx->poic_tagattr != NULL &&
!_PROP_TAGATTR_MATCH(ctx, "version"))
goto out;
/* Next we expect to see opening master_tag. */
if (_prop_object_internalize_find_tag(ctx, master_tag,
_PROP_TAG_TYPE_START) == false)
goto out;
obj = _prop_object_internalize_by_tag(ctx);
if (obj == NULL)
goto out;
/*
* We've advanced past the closing master_tag.
* Now we want </plist>.
*/
if (_prop_object_internalize_find_tag(ctx, "plist",
_PROP_TAG_TYPE_END) == false) {
prop_object_release(obj);
obj = NULL;
}
out:
_prop_object_internalize_context_free(ctx);
return (obj);
}
/*
* _prop_object_internalize_context_alloc --
* Allocate an internalize context.
*/
struct _prop_object_internalize_context *
_prop_object_internalize_context_alloc(const char *xml)
{
struct _prop_object_internalize_context *ctx;
if (xml == NULL)
return NULL;
ctx = _PROP_MALLOC(sizeof(struct _prop_object_internalize_context),
M_TEMP);
if (ctx == NULL)
return (NULL);
ctx->poic_xml = ctx->poic_cp = xml;
/*
* Skip any whitespace and XML preamble stuff that we don't
* know about / care about.
*/
for (;;) {
if (_PROP_EOF(*xml))
goto bad;
while (_PROP_ISSPACE(*xml))
xml++;
if (_PROP_EOF(*xml) || *xml != '<')
goto bad;
#define MATCH(str) (memcmp(&xml[1], str, sizeof(str) - 1) == 0)
/*
* Skip over the XML preamble that Apple XML property
* lists usually include at the top of the file.
*/
if (MATCH("?xml ") ||
MATCH("!DOCTYPE plist")) {
while (*xml != '>' && !_PROP_EOF(*xml))
xml++;
if (_PROP_EOF(*xml))
goto bad;
xml++; /* advance past the '>' */
continue;
}
if (MATCH("<!--")) {
ctx->poic_cp = xml + 4;
if (_prop_object_internalize_skip_comment(ctx) == false)
goto bad;
xml = ctx->poic_cp;
continue;
}
#undef MATCH
/*
* We don't think we should skip it, so let's hope we can
* parse it.
*/
break;
}
ctx->poic_cp = xml;
return (ctx);
bad:
_PROP_FREE(ctx, M_TEMP);
return (NULL);
}
/*
* _prop_object_internalize_context_free --
* Free an internalize context.
*/
void
_prop_object_internalize_context_free(
struct _prop_object_internalize_context *ctx)
{
_PROP_FREE(ctx, M_TEMP);
}
/*
* _prop_object_externalize_file_dirname --
* dirname(3), basically. We have to roll our own because the
* system dirname(3) isn't reentrant.
*/
static void
_prop_object_externalize_file_dirname(const char *path, char *result)
{
const char *lastp;
size_t len;
/*
* If `path' is a NULL pointer or points to an empty string,
* return ".".
*/
if (path == NULL || *path == '\0')
goto singledot;
/* String trailing slashes, if any. */
lastp = path + strlen(path) - 1;
while (lastp != path && *lastp == '/')
lastp--;
/* Terminate path at the last occurrence of '/'. */
do {
if (*lastp == '/') {
/* Strip trailing slashes, if any. */
while (lastp != path && *lastp == '/')
lastp--;
/* ...and copy the result into the result buffer. */
len = (lastp - path) + 1 /* last char */;
if (len > (PATH_MAX - 1))
len = PATH_MAX - 1;
memcpy(result, path, len);
result[len] = '\0';
return;
}
} while (--lastp >= path);
/* No /'s found, return ".". */
singledot:
strcpy(result, ".");
}
/*
* _prop_object_externalize_write_file --
* Write an externalized dictionary to the specified file.
* The file is written atomically from the caller's perspective,
* and the mode set to 0666 modified by the caller's umask.
*
* The 'compress' argument enables gzip (via zlib) compression
* for the file to be written.
*/
bool
_prop_object_externalize_write_file(const char *fname, const char *xml,
size_t len, bool do_compress)
{
gzFile gzf = NULL;
char tname[PATH_MAX];
int fd;
int save_errno;
mode_t myumask;
if (len > SSIZE_MAX) {
errno = EFBIG;
return (false);
}
/*
* Get the directory name where the file is to be written
* and create the temporary file.
*/
_prop_object_externalize_file_dirname(fname, tname);
#define PLISTTMP "/.plistXXXXXX"
if (strlen(tname) + strlen(PLISTTMP) >= sizeof(tname)) {
errno = ENAMETOOLONG;
return (false);
}
strcat(tname, PLISTTMP);
#undef PLISTTMP
if ((fd = mkstemp(tname)) == -1)
return (false);
if (do_compress) {
if ((gzf = gzdopen(fd, "a")) == NULL)
goto bad;
if (gzsetparams(gzf, Z_BEST_COMPRESSION, Z_DEFAULT_STRATEGY))
goto bad;
if (gzwrite(gzf, xml, len) != (ssize_t)len)
goto bad;
} else {
if (write(fd, xml, len) != (ssize_t)len)
goto bad;
}
#ifdef HAVE_FDATASYNC
if (fdatasync(fd) == -1)
#else
if (fsync(fd) == -1)
#endif
goto bad;
myumask = umask(0);
(void)umask(myumask);
if (fchmod(fd, 0666 & ~myumask) == -1)
goto bad;
if (do_compress)
(void)gzclose(gzf);
else
(void)close(fd);
fd = -1;
if (rename(tname, fname) == -1)
goto bad;
return (true);
bad:
save_errno = errno;
if (do_compress && gzf != NULL)
(void)gzclose(gzf);
else if (fd != -1)
(void)close(fd);
(void) unlink(tname);
errno = save_errno;
return (false);
}
/*
* _prop_object_internalize_map_file --
* Map a file for the purpose of internalizing it.
*/
struct _prop_object_internalize_mapped_file *
_prop_object_internalize_map_file(const char *fname)
{
struct stat sb;
struct _prop_object_internalize_mapped_file *mf;
long scps = sysconf(_SC_PAGESIZE);
size_t pgsize, pgmask;
bool need_guard = false;
int fd;
if (scps == -1)
return NULL;
pgsize = (size_t)scps;
pgmask = pgsize -1;
mf = _PROP_MALLOC(sizeof(*mf), M_TEMP);
if (mf == NULL)
return (NULL);
fd = open(fname, O_RDONLY, 0400);
if (fd == -1) {
_PROP_FREE(mf, M_TEMP);
return (NULL);
}
if (fstat(fd, &sb) == -1) {
(void) close(fd);
_PROP_FREE(mf, M_TEMP);
return (NULL);
}
mf->poimf_mapsize = ((size_t)sb.st_size + pgmask) & ~pgmask;
if (mf->poimf_mapsize < (size_t)sb.st_size) {
(void) close(fd);
_PROP_FREE(mf, M_TEMP);
return (NULL);
}
/*
* If the file length is an integral number of pages, then we
* need to map a guard page at the end in order to provide the
* necessary NUL-termination of the buffer.
*/
if ((sb.st_size & pgmask) == 0)
need_guard = true;
mf->poimf_xml = mmap(NULL, need_guard ? mf->poimf_mapsize + pgsize
: mf->poimf_mapsize,
PROT_READ, MAP_SHARED, fd, (off_t)0);
(void) close(fd);
if (mf->poimf_xml == MAP_FAILED) {
_PROP_FREE(mf, M_TEMP);
return (NULL);
}
(void)posix_madvise(mf->poimf_xml, mf->poimf_mapsize, POSIX_MADV_SEQUENTIAL);
if (need_guard) {
if (mmap(mf->poimf_xml + mf->poimf_mapsize,
pgsize, PROT_READ,
MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1,
(off_t)0) == MAP_FAILED) {
(void) munmap(mf->poimf_xml, mf->poimf_mapsize);
_PROP_FREE(mf, M_TEMP);
return (NULL);
}
mf->poimf_mapsize += pgsize;
}
return (mf);
}
/*
* _prop_object_internalize_unmap_file --
* Unmap a file previously mapped for internalizing.
*/
void
_prop_object_internalize_unmap_file(
struct _prop_object_internalize_mapped_file *mf)
{
(void)posix_madvise(mf->poimf_xml, mf->poimf_mapsize, POSIX_MADV_DONTNEED);
(void)munmap(mf->poimf_xml, mf->poimf_mapsize);
_PROP_FREE(mf, M_TEMP);
}
/*
* prop_object_retain --
* Increment the reference count on an object.
*/
void
prop_object_retain(prop_object_t obj)
{
struct _prop_object *po = obj;
uint32_t ncnt _PROP_ARG_UNUSED;
_PROP_ATOMIC_INC32_NV(&po->po_refcnt, ncnt);
_PROP_ASSERT(ncnt != 0);
}
/*
* prop_object_release_emergency
* A direct free with prop_object_release failed.
* Walk down the tree until a leaf is found and
* free that. Do not recurse to avoid stack overflows.
*
* This is a slow edge condition, but necessary to
* guarantee that an object can always be freed.
*/
static void
prop_object_release_emergency(prop_object_t obj)
{
struct _prop_object *po;
void (*unlock)(void);
prop_object_t parent = NULL;
uint32_t ocnt;
for (;;) {
po = obj;
_PROP_ASSERT(obj);
if (po->po_type->pot_lock != NULL)
po->po_type->pot_lock();
/* Save pointerto unlock function */
unlock = po->po_type->pot_unlock;
/* Dance a bit to make sure we always get the non-racy ocnt */
_PROP_ATOMIC_DEC32_NV(&po->po_refcnt, ocnt);
ocnt++;
_PROP_ASSERT(ocnt != 0);
if (ocnt != 1) {
if (unlock != NULL)
unlock();
break;
}
_PROP_ASSERT(po->po_type);
if ((po->po_type->pot_free)(NULL, &obj) ==
_PROP_OBJECT_FREE_DONE) {
if (unlock != NULL)
unlock();
break;
}
if (unlock != NULL)
unlock();
parent = po;
_PROP_ATOMIC_INC32(&po->po_refcnt);
}
_PROP_ASSERT(parent);
/* One object was just freed. */
po = parent;
(*po->po_type->pot_emergency_free)(parent);
}
/*
* prop_object_release --
* Decrement the reference count on an object.
*
* Free the object if we are releasing the final
* reference.
*/
void
prop_object_release(prop_object_t obj)
{
struct _prop_object *po;
struct _prop_stack stack;
void (*unlock)(void);
int ret;
uint32_t ocnt;
_prop_stack_init(&stack);
do {
do {
po = obj;
_PROP_ASSERT(obj);
if (po->po_type->pot_lock != NULL)
po->po_type->pot_lock();
/* Save pointer to object unlock function */
unlock = po->po_type->pot_unlock;
_PROP_ATOMIC_DEC32_NV(&po->po_refcnt, ocnt);
ocnt++;
_PROP_ASSERT(ocnt != 0);
if (ocnt != 1) {
ret = 0;
if (unlock != NULL)
unlock();
break;
}
ret = (po->po_type->pot_free)(&stack, &obj);
if (unlock != NULL)
unlock();
if (ret == _PROP_OBJECT_FREE_DONE)
break;
_PROP_ATOMIC_INC32(&po->po_refcnt);
} while (ret == _PROP_OBJECT_FREE_RECURSE);
if (ret == _PROP_OBJECT_FREE_FAILED)
prop_object_release_emergency(obj);
} while (_prop_stack_pop(&stack, &obj, NULL, NULL, NULL));
}
/*
* prop_object_type --
* Return the type of an object.
*/
prop_type_t
prop_object_type(prop_object_t obj)
{
struct _prop_object *po = obj;
if (obj == NULL)
return (PROP_TYPE_UNKNOWN);
return (po->po_type->pot_type);
}
/*
* prop_object_equals --
* Returns true if thw two objects are equivalent.
*/
bool
prop_object_equals(prop_object_t obj1, prop_object_t obj2)
{
return (prop_object_equals_with_error(obj1, obj2, NULL));
}
bool
prop_object_equals_with_error(prop_object_t obj1, prop_object_t obj2,
bool *error_flag)
{
struct _prop_object *po1;
struct _prop_object *po2;
void *stored_pointer1, *stored_pointer2;
prop_object_t next_obj1, next_obj2;
struct _prop_stack stack;
_prop_object_equals_rv_t ret;
_prop_stack_init(&stack);
if (error_flag)
*error_flag = false;
start_subtree:
stored_pointer1 = NULL;
stored_pointer2 = NULL;
po1 = obj1;
po2 = obj2;
if (po1->po_type != po2->po_type)
return (false);
continue_subtree:
ret = (*po1->po_type->pot_equals)(obj1, obj2,
&stored_pointer1, &stored_pointer2,
&next_obj1, &next_obj2);
if (ret == _PROP_OBJECT_EQUALS_FALSE)
goto finish;
if (ret == _PROP_OBJECT_EQUALS_TRUE) {
if (!_prop_stack_pop(&stack, &obj1, &obj2,
&stored_pointer1, &stored_pointer2))
return true;
po1 = obj1;
po2 = obj2;
goto continue_subtree;
}
_PROP_ASSERT(ret == _PROP_OBJECT_EQUALS_RECURSE);
if (!_prop_stack_push(&stack, obj1, obj2,
stored_pointer1, stored_pointer2)) {
if (error_flag)
*error_flag = true;
goto finish;
}
obj1 = next_obj1;
obj2 = next_obj2;
goto start_subtree;
finish:
while (_prop_stack_pop(&stack, &obj1, &obj2, NULL, NULL)) {
po1 = obj1;
(*po1->po_type->pot_equals_finish)(obj1, obj2);
}
return (false);
}
/*
* prop_object_iterator_next --
* Return the next item during an iteration.
*/
prop_object_t
prop_object_iterator_next(prop_object_iterator_t pi)
{
return ((*pi->pi_next_object)(pi));
}
/*
* prop_object_iterator_reset --
* Reset the iterator to the first object so as to restart
* iteration.
*/
void
prop_object_iterator_reset(prop_object_iterator_t pi)
{
(*pi->pi_reset)(pi);
}
/*
* prop_object_iterator_release --
* Release the object iterator.
*/
void
prop_object_iterator_release(prop_object_iterator_t pi)
{
prop_object_release(pi->pi_obj);
_PROP_FREE(pi, M_TEMP);
}
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