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mxml.c
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mxml.c
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/********************************************************************\
Name: mxml.c
Created by: Stefan Ritt
Copyright 2000 + Stefan Ritt
Contents: Midas XML Library
This is a simple implementation of XML functions for writing and
reading XML files. For writing an XML file from scratch, following
functions can be used:
writer = mxml_open_file(file_name);
mxml_start_element(writer, name);
mxml_write_attribute(writer, name, value);
mxml_write_value(writer, value);
mxml_end_element(writer);
...
mxml_close_file(writer);
To read an XML file, the function
tree = mxml_parse_file(file_name, error, sizeof(error));
is used. It parses the complete XML file and stores it in a
hierarchical tree in memory. Nodes in that tree can be searched
for with
mxml_find_node(tree, xml_path);
or
mxml_find_nodes(tree, xml_path, &nodelist);
which support a subset of the XPath specification. Another set of
functions is availabe to retrieve attributes and values from nodes
in the tree and for manipulating nodes, like replacing, adding and
deleting nodes.
This file is part of MIDAS XML Library.
MIDAS XML Library is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
MIDAS XML Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with MIDAS XML Library. If not, see <http://www.gnu.org/licenses/>.
\********************************************************************/
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <assert.h>
#ifdef _MSC_VER
#include <windows.h>
#include <io.h>
#include <time.h>
#pragma warning( disable: 4996) /* disable "deprecated" warning */
#else
#define TRUE 1
#define FALSE 0
#ifndef O_TEXT
#define O_TEXT 0
#define O_BINARY 0
#endif
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <stdarg.h>
#include <errno.h>
#ifndef OS_VXWORKS
#include <sys/time.h>
#endif
#include <time.h>
#endif
#include "mxml.h"
#ifndef HAVE_STRLCPY
#include "strlcpy.h"
#endif
#define XML_INDENT " "
#if defined(__GNUC__) && !defined(__MAKECINT__)
# define MXML_GNUC_PRINTF( format_idx, arg_idx ) \
__attribute__((format (printf, format_idx, arg_idx)))
# define MXML_GNUC_SCANF( format_idx, arg_idx ) \
__attribute__((format (scanf, format_idx, arg_idx)))
# define MXML_GNUC_FORMAT( arg_idx ) \
__attribute__((format_arg (arg_idx)))
#else
# define MXML_GNUC_PRINTF( format_idx, arg_idx )
# define MXML_GNUC_SCANF( format_idx, arg_idx )
# define MXML_GNUC_FORMAT( arg_idx )
#endif
static int mxml_suppress_date_flag = 0; /* suppress writing date at the top of file. */
/* local prototypes */
static PMXML_NODE read_error(PMXML_NODE root, const char *file_name, int line_number, char *error, int error_size, int *error_line, const char *format, ...) MXML_GNUC_PRINTF(7, 8);
static void mxml_encode(char *src, int size, int translate);
static void mxml_decode(char *str);
static int mxml_write_subtree(MXML_WRITER *writer, PMXML_NODE tree, int indent);
static int mxml_write_line(MXML_WRITER *writer, const char *line);
static int mxml_start_element1(MXML_WRITER *writer, const char *name, int indent);
static int mxml_add_resultnode(PMXML_NODE node, const char *xml_path, PMXML_NODE **nodelist, int *found);
static int mxml_find_nodes1(PMXML_NODE tree, const char *xml_path, PMXML_NODE **nodelist, int *found);
static void *mxml_malloc(size_t size);
static void *mxml_realloc(void *p, size_t size);
static void mxml_free(void *p);
static void mxml_deallocate(void);
/*------------------------------------------------------------------*/
static char *_encode_buffer = NULL;
static char *_data_enc = NULL;
/*------------------------------------------------------------------*/
void *mxml_malloc(size_t size)
{
return malloc(size);
}
/*------------------------------------------------------------------*/
void *mxml_realloc(void *p, size_t size)
{
return realloc(p, size);
}
/*------------------------------------------------------------------*/
void mxml_free(void *p)
{
free(p);
}
/*------------------------------------------------------------------*/
void mxml_deallocate(void)
{
if (_encode_buffer != NULL) {
mxml_free(_encode_buffer);
_encode_buffer = NULL;
}
if (_data_enc != NULL) {
mxml_free(_data_enc);
_data_enc = NULL;
}
}
/*------------------------------------------------------------------*/
int mxml_write_line(MXML_WRITER *writer, const char *line)
{
int len;
len = (int)strlen(line);
if (writer->buffer) {
if (writer->buffer_len + len >= writer->buffer_size) {
writer->buffer_size += 10000;
writer->buffer = (char *)mxml_realloc(writer->buffer, writer->buffer_size);
}
strcpy(writer->buffer + writer->buffer_len, line);
writer->buffer_len += len;
return len;
} else {
return (int)write(writer->fh, line, len);
}
return 0;
}
/*------------------------------------------------------------------*/
/**
* open a memory buffer and write XML header
*/
MXML_WRITER *mxml_open_buffer(void)
{
char str[256], line[1000];
time_t now;
MXML_WRITER *writer;
writer = (MXML_WRITER *)mxml_malloc(sizeof(MXML_WRITER));
memset(writer, 0, sizeof(MXML_WRITER));
writer->translate = 1;
writer->buffer_size = 10000;
writer->buffer = (char *)mxml_malloc(10000);
writer->buffer[0] = 0;
writer->buffer_len = 0;
/* write XML header */
strcpy(line, "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n");
mxml_write_line(writer, line);
time(&now);
strcpy(str, ctime(&now));
str[24] = 0;
sprintf(line, "<!-- created by MXML on %s -->\n", str);
if (mxml_suppress_date_flag == 0)
mxml_write_line(writer, line);
/* initialize stack */
writer->level = 0;
writer->element_is_open = 0;
return writer;
}
/*------------------------------------------------------------------*/
/**
* suppress writing date at the top of file.
*/
void mxml_suppress_date(int suppress)
{
mxml_suppress_date_flag = suppress;
}
/*------------------------------------------------------------------*/
/**
* open a file and write XML header
*/
MXML_WRITER *mxml_open_file(const char *file_name)
{
char str[256], line[1000];
time_t now;
MXML_WRITER *writer;
writer = (MXML_WRITER *)mxml_malloc(sizeof(MXML_WRITER));
memset(writer, 0, sizeof(MXML_WRITER));
writer->translate = 1;
writer->fh = open(file_name, O_RDWR | O_CREAT | O_TRUNC | O_TEXT, 0644);
if (writer->fh == -1) {
sprintf(line, "Unable to open file \"%s\": ", file_name);
perror(line);
mxml_free(writer);
return NULL;
}
/* write XML header */
strcpy(line, "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n");
mxml_write_line(writer, line);
time(&now);
strcpy(str, ctime(&now));
str[24] = 0;
sprintf(line, "<!-- created by MXML on %s -->\n", str);
if (mxml_suppress_date_flag == 0)
mxml_write_line(writer, line);
/* initialize stack */
writer->level = 0;
writer->element_is_open = 0;
return writer;
}
/*------------------------------------------------------------------*/
/**
* convert '<' '>' '&' '"' ''' into &xx;
*/
void mxml_encode(char *src, int size, int translate)
{
char *ps, *pd;
static int buffer_size = 1000;
assert(size);
if (_encode_buffer == NULL) {
_encode_buffer = (char *) mxml_malloc(buffer_size);
atexit(mxml_deallocate);
}
if (size > buffer_size) {
_encode_buffer = (char *) mxml_realloc(_encode_buffer, size*2);
buffer_size = size;
}
pd = _encode_buffer;
for (ps = src ; *ps && (size_t)pd - (size_t)_encode_buffer < (size_t)(size-10) ; ps++) {
if (translate) { /* tranlate "<", ">", "&", """, "'" */
switch (*ps) {
case '<':
strcpy(pd, "<");
pd += 4;
break;
case '>':
strcpy(pd, ">");
pd += 4;
break;
case '&':
strcpy(pd, "&");
pd += 5;
break;
case '\"':
strcpy(pd, """);
pd += 6;
break;
case '\'':
strcpy(pd, "'");
pd += 6;
break;
default:
*pd++ = *ps;
}
} else {
switch (*ps) { /* translate only illegal XML characters "<" and "&" */
case '<':
strcpy(pd, "<");
pd += 4;
break;
case '&':
strcpy(pd, "&");
pd += 5;
break;
default:
*pd++ = *ps;
}
}
}
*pd = 0;
strlcpy(src, _encode_buffer, size);
}
/*------------------------------------------------------------------*/
/**
* reverse of mxml_encode, strip leading or trailing '"'
*/
void mxml_decode(char *str)
{
char *p;
p = str;
while ((p = strchr(p, '&')) != NULL) {
if (strncmp(p, "<", 4) == 0) {
*(p++) = '<';
memmove(p, p+3, strlen(p+3) + 1);
}
else if (strncmp(p, ">", 4) == 0) {
*(p++) = '>';
memmove(p, p+3, strlen(p+3) + 1);
}
else if (strncmp(p, "&", 5) == 0) {
*(p++) = '&';
memmove(p, p+4, strlen(p+4) + 1);
}
else if (strncmp(p, """, 6) == 0) {
*(p++) = '\"';
memmove(p, p+5, strlen(p+5) + 1);
}
else if (strncmp(p, "'", 6) == 0) {
*(p++) = '\'';
memmove(p, p+5, strlen(p+5) + 1);
}
else {
p++; // skip unknown entity
}
}
/* if (str[0] == '\"' && str[strlen(str)-1] == '\"') {
memmove(str, str+1, strlen(str+1) + 1);
str[strlen(str)-1] = 0;
}*/
}
/*------------------------------------------------------------------*/
/**
* set translation of <,>,",',&, on/off in writer
*/
int mxml_set_translate(MXML_WRITER *writer, int flag)
{
int old_flag;
old_flag = writer->translate;
writer->translate = flag;
return old_flag;
}
/*------------------------------------------------------------------*/
/**
* start a new XML element, must be followed by mxml_end_elemnt
*/
int mxml_start_element1(MXML_WRITER *writer, const char *name, int indent)
{
int i;
char line[1000], name_enc[1000];
if (writer->element_is_open) {
mxml_write_line(writer, ">\n");
writer->element_is_open = FALSE;
}
line[0] = 0;
if (indent)
for (i=0 ; i<writer->level ; i++)
strlcat(line, XML_INDENT, sizeof(line));
strlcat(line, "<", sizeof(line));
strlcpy(name_enc, name, sizeof(name_enc));
mxml_encode(name_enc, sizeof(name_enc), writer->translate);
strlcat(line, name_enc, sizeof(line));
/* put element on stack */
if (writer->level == 0)
writer->stack = (char **)mxml_malloc(sizeof(char *));
else
writer->stack = (char **)mxml_realloc(writer->stack, sizeof(char *)*(writer->level+1));
writer->stack[writer->level] = (char *) mxml_malloc(strlen(name_enc)+1);
strcpy(writer->stack[writer->level], name_enc);
writer->level++;
writer->element_is_open = TRUE;
writer->data_was_written = FALSE;
return mxml_write_line(writer, line) == (int)strlen(line);
}
/*------------------------------------------------------------------*/
int mxml_start_element(MXML_WRITER *writer, const char *name)
{
return mxml_start_element1(writer, name, TRUE);
}
/*------------------------------------------------------------------*/
int mxml_start_element_noindent(MXML_WRITER *writer, const char *name)
{
return mxml_start_element1(writer, name, FALSE);
}
/*------------------------------------------------------------------*/
/**
* close an open XML element
*/
int mxml_end_element(MXML_WRITER *writer)
{
int i;
char line[1000];
if (writer->level == 0)
return 0;
writer->level--;
if (writer->element_is_open) {
writer->element_is_open = FALSE;
mxml_free(writer->stack[writer->level]);
if (writer->level == 0)
mxml_free(writer->stack);
strcpy(line, "/>\n");
return mxml_write_line(writer, line) == (int)strlen(line);
}
line[0] = 0;
if (!writer->data_was_written) {
for (i=0 ; i<writer->level ; i++)
strlcat(line, XML_INDENT, sizeof(line));
}
strlcat(line, "</", sizeof(line));
strlcat(line, writer->stack[writer->level], sizeof(line));
mxml_free(writer->stack[writer->level]);
if (writer->level == 0)
mxml_free(writer->stack);
strlcat(line, ">\n", sizeof(line));
writer->data_was_written = FALSE;
return mxml_write_line(writer, line) == (int)strlen(line);
}
/*------------------------------------------------------------------*/
/**
* write an attribute to the currently open XML element
*/
int mxml_write_attribute(MXML_WRITER *writer, const char *name, const char *value)
{
char name_enc[4096], val_enc[4096], line[8192];
if (!writer->element_is_open)
return FALSE;
strcpy(name_enc, name);
mxml_encode(name_enc, sizeof(name_enc), writer->translate);
strcpy(val_enc, value);
mxml_encode(val_enc, sizeof(val_enc), writer->translate);
sprintf(line, " %s=\"%s\"", name_enc, val_enc);
return mxml_write_line(writer, line) == (int)strlen(line);
}
/*------------------------------------------------------------------*/
/**
* write value of an XML element, like <[name]>[value]</[name]>
*/
int mxml_write_value(MXML_WRITER *writer, const char *data)
{
static int data_size = 0;
if (!writer->element_is_open)
return FALSE;
if (mxml_write_line(writer, ">") != 1)
return FALSE;
writer->element_is_open = FALSE;
writer->data_was_written = TRUE;
if (data_size == 0) {
_data_enc = (char *)mxml_malloc(1000);
data_size = 1000;
} else if ((int)strlen(data)*2+1000 > data_size) {
data_size = 1000+(int)strlen(data)*2;
_data_enc = (char *)mxml_realloc(_data_enc, data_size);
}
strcpy(_data_enc, data);
mxml_encode(_data_enc, data_size, writer->translate);
return mxml_write_line(writer, _data_enc) == (int)strlen(_data_enc);
}
/*------------------------------------------------------------------*/
/**
* write empty line
*/
int mxml_write_empty_line(MXML_WRITER *writer)
{
if (writer->element_is_open) {
mxml_write_line(writer, ">\n");
writer->element_is_open = FALSE;
}
if (mxml_write_line(writer, "\n") != 1)
return FALSE;
return TRUE;
}
/*------------------------------------------------------------------*/
/**
* write a comment to an XML file, enclosed in "<!--" and "-->"
*/
int mxml_write_comment(MXML_WRITER *writer, const char *string)
{
int i;
char line[1000];
if (writer->element_is_open) {
mxml_write_line(writer, ">\n");
writer->element_is_open = FALSE;
}
line[0] = 0;
for (i=0 ; i<writer->level ; i++)
strlcat(line, XML_INDENT, sizeof(line));
strlcat(line, "<!-- ", sizeof(line));
strlcat(line, string, sizeof(line));
strlcat(line, " -->\n", sizeof(line));
if (mxml_write_line(writer, line) != (int)strlen(line))
return FALSE;
return TRUE;
}
/*------------------------------------------------------------------*/
/**
* shortcut to write an element with a value but without attribute
*/
int mxml_write_element(MXML_WRITER *writer, const char *name, const char *value)
{
int i;
i = mxml_start_element(writer, name);
i += mxml_write_value(writer, value);
i += mxml_end_element(writer);
return i;
}
/*------------------------------------------------------------------*/
/**
* close a file opened with mxml_open_writer
*/
char *mxml_close_buffer(MXML_WRITER *writer)
{
int i;
char *p;
if (writer->element_is_open) {
writer->element_is_open = FALSE;
if (mxml_write_line(writer, ">\n") != 2)
return NULL;
}
/* close remaining open levels */
for (i = 0 ; i<writer->level ; i++)
mxml_end_element(writer);
p = writer->buffer;
mxml_free(writer);
return p;
}
/*------------------------------------------------------------------*/
/**
* close a file opened with mxml_open_writer
*/
int mxml_close_file(MXML_WRITER *writer)
{
int i;
if (writer->element_is_open) {
writer->element_is_open = FALSE;
if (mxml_write_line(writer, ">\n") != 2)
return 0;
}
/* close remaining open levels */
for (i = 0 ; i<writer->level ; i++)
mxml_end_element(writer);
close(writer->fh);
mxml_free(writer);
return 1;
}
/*------------------------------------------------------------------*/
/**
* create root node of an XML tree
*/
PMXML_NODE mxml_create_root_node(void)
{
PMXML_NODE root;
root = (PMXML_NODE)calloc(sizeof(MXML_NODE), 1);
strcpy(root->name, "root");
root->node_type = DOCUMENT_NODE;
return root;
}
/*------------------------------------------------------------------*/
/**
* add a subnode (child) to an existing parent node as a specific position
*/
PMXML_NODE mxml_add_special_node_at(PMXML_NODE parent, int node_type, const char *node_name, const char *value, int idx)
{
PMXML_NODE pnode, pchild;
int i, j;
assert(parent);
if (parent->n_children == 0)
parent->child = (PMXML_NODE)mxml_malloc(sizeof(MXML_NODE));
else
parent->child = (PMXML_NODE)mxml_realloc(parent->child, sizeof(MXML_NODE)*(parent->n_children+1));
assert(parent->child);
/* move following nodes one down */
if (idx < parent->n_children)
for (i=parent->n_children ; i > idx ; i--)
memcpy(&parent->child[i], &parent->child[i-1], sizeof(MXML_NODE));
/* correct parent pointer for children */
for (i=0 ; i<parent->n_children ; i++) {
pchild = parent->child+i;
for (j=0 ; j<pchild->n_children ; j++)
pchild->child[j].parent = pchild;
}
/* initialize new node */
pnode = &parent->child[idx];
memset(pnode, 0, sizeof(MXML_NODE));
strlcpy(pnode->name, node_name, sizeof(pnode->name));
pnode->node_type = node_type;
pnode->parent = parent;
parent->n_children++;
if (value && *value) {
pnode->value = (char *)mxml_malloc(strlen(value)+1);
assert(pnode->value);
strcpy(pnode->value, value);
}
return pnode;
}
/*------------------------------------------------------------------*/
/**
* add a subnode (child) to an existing parent node at the end
*/
PMXML_NODE mxml_add_special_node(PMXML_NODE parent, int node_type, const char *node_name, const char *value)
{
return mxml_add_special_node_at(parent, node_type, node_name, value, parent->n_children);
}
/*------------------------------------------------------------------*/
/**
* write value of an XML element, like <[name]>[value]</[name]>
*/
PMXML_NODE mxml_add_node(PMXML_NODE parent, const char *node_name, const char *value)
{
return mxml_add_special_node_at(parent, ELEMENT_NODE, node_name, value, parent->n_children);
}
/*------------------------------------------------------------------*/
/**
* add a subnode (child) to an existing parent node at the end
*/
PMXML_NODE mxml_add_node_at(PMXML_NODE parent, const char *node_name, const char *value, int idx)
{
return mxml_add_special_node_at(parent, ELEMENT_NODE, node_name, value, idx);
}
/*------------------------------------------------------------------*/
/**
* add a whole node tree to an existing parent node at a specific position
*/
int mxml_add_tree_at(PMXML_NODE parent, PMXML_NODE tree, int idx)
{
PMXML_NODE pchild;
int i, j, k;
assert(parent);
assert(tree);
if (parent->n_children == 0)
parent->child = (PMXML_NODE)mxml_malloc(sizeof(MXML_NODE));
else {
pchild = parent->child;
parent->child = (PMXML_NODE)mxml_realloc(parent->child, sizeof(MXML_NODE)*(parent->n_children+1));
if (parent->child != pchild) {
/* correct parent pointer for children */
for (i=0 ; i<parent->n_children ; i++) {
pchild = parent->child+i;
for (j=0 ; j<pchild->n_children ; j++)
pchild->child[j].parent = pchild;
}
}
}
assert(parent->child);
if (idx < parent->n_children)
for (i=parent->n_children ; i > idx ; i--) {
/* move following nodes one down */
memcpy(&parent->child[i], &parent->child[i-1], sizeof(MXML_NODE));
/* correct parent pointer for children */
for (j=0 ; j<parent->n_children ; j++) {
pchild = parent->child+j;
for (k=0 ; k<pchild->n_children ; k++)
pchild->child[k].parent = pchild;
}
}
/* initialize new node */
memcpy(parent->child+idx, tree, sizeof(MXML_NODE));
parent->n_children++;
parent->child[idx].parent = parent;
/* correct parent pointer for children */
for (i=0 ; i<parent->n_children ; i++) {
pchild = parent->child+i;
for (j=0 ; j<pchild->n_children ; j++)
pchild->child[j].parent = pchild;
}
return TRUE;
}
/*------------------------------------------------------------------*/
/**
* add a whole node tree to an existing parent node at the end
*/
int mxml_add_tree(PMXML_NODE parent, PMXML_NODE tree)
{
return mxml_add_tree_at(parent, tree, parent->n_children);
}
/*------------------------------------------------------------------*/
/**
* add an attribute to an existing node
*/
int mxml_add_attribute(PMXML_NODE pnode, const char *attrib_name, const char *attrib_value)
{
if (pnode->n_attributes == 0) {
pnode->attribute_name = (char*)mxml_malloc(MXML_NAME_LENGTH);
pnode->attribute_value = (char**)mxml_malloc(sizeof(char *));
} else {
pnode->attribute_name = (char*)mxml_realloc(pnode->attribute_name, MXML_NAME_LENGTH*(pnode->n_attributes+1));
pnode->attribute_value = (char**)mxml_realloc(pnode->attribute_value, sizeof(char *)*(pnode->n_attributes+1));
}
strlcpy(pnode->attribute_name+pnode->n_attributes*MXML_NAME_LENGTH, attrib_name, MXML_NAME_LENGTH);
pnode->attribute_value[pnode->n_attributes] = (char *)mxml_malloc(strlen(attrib_value)+1);
strcpy(pnode->attribute_value[pnode->n_attributes], attrib_value);
pnode->n_attributes++;
return TRUE;
}
/*------------------------------------------------------------------*/
/**
* return number of subnodes (children) of a node
*/
int mxml_get_number_of_children(PMXML_NODE pnode)
{
assert(pnode);
return pnode->n_children;
}
/*------------------------------------------------------------------*/
/**
* return number of subnodes (children) of a node
*/
PMXML_NODE mxml_subnode(PMXML_NODE pnode, int idx)
{
assert(pnode);
if (idx < pnode->n_children)
return &pnode->child[idx];
return NULL;
}
/*------------------------------------------------------------------*/
int mxml_find_nodes1(PMXML_NODE tree, const char *xml_path, PMXML_NODE **nodelist, int *found);
int mxml_add_resultnode(PMXML_NODE node, const char *xml_path, PMXML_NODE **nodelist, int *found)
{
/* if at end of path, add this node */
if (*xml_path == 0) {
if (*found == 0)
*nodelist = (PMXML_NODE *)mxml_malloc(sizeof(PMXML_NODE));
else
*nodelist = (PMXML_NODE *)mxml_realloc(*nodelist, sizeof(PMXML_NODE)*(*found + 1));
(*nodelist)[*found] = node;
(*found)++;
} else {
/* if not at end of path, branch into subtree */
return mxml_find_nodes1(node, xml_path+1, nodelist, found);
}
return 1;
}
/*------------------------------------------------------------------*/
/**
Return list of XML nodes with a subset of XPATH specifications.
Following elemets are possible
/<node>/<node>/..../<node> Find a node in the tree hierarchy
/<node>[idx] Find child #[idx] of node (index starts from 1)
/<node>[idx]/<node> Find subnode of the above
/<node>[<subnode>=<value>] Find a node which has a specific subnode
/<node>[<subnode>=<value>]/<node> Find subnode of the above
/<node>[@<attrib>=<value>]/<node> Find a node which has a specific attribute
*/
int mxml_find_nodes1(PMXML_NODE tree, const char *xml_path, PMXML_NODE **nodelist, int *found)
{
PMXML_NODE pnode;
const char *p1,*p2;
char *p3, node_name[256], condition[256];
char cond_name[MXML_MAX_CONDITION][256], cond_value[MXML_MAX_CONDITION][256];
int cond_type[MXML_MAX_CONDITION];
int i, j, k, idx, num_cond;
int cond_satisfied,cond_index;
size_t len;
p1 = xml_path;
pnode = tree;
/* skip leading '/' */
if (*p1 && *p1 == '/')
p1++;
do {
p2 = p1;
while (*p2 && *p2 != '/' && *p2 != '[')
p2++;
len = (size_t)p2 - (size_t)p1;
if (len >= sizeof(node_name))
return 0;
memcpy(node_name, p1, len);
node_name[len] = 0;
idx = 0;
num_cond = 0;
while (*p2 == '[') {
cond_name[num_cond][0] = cond_value[num_cond][0] = cond_type[num_cond] = 0;
p2++;
if (isdigit(*p2)) {
/* evaluate [idx] */
idx = atoi(p2);
p2 = strchr(p2, ']');
if (p2 == NULL)
return 0;
p2++;
} else {
/* evaluate [<@attrib>/<subnode>=<value>] */
while (*p2 && isspace((unsigned char)*p2))
p2++;
strlcpy(condition, p2, sizeof(condition));
if (strchr(condition, ']'))
*strchr(condition, ']') = 0;
else
return 0;
p2 = strchr(p2, ']')+1;
if ((p3 = strchr(condition, '=')) != NULL) {
if (condition[0] == '@') {
cond_type[num_cond] = 1;
strlcpy(cond_name[num_cond], &condition[1], sizeof(cond_name[num_cond]));
} else {
strlcpy(cond_name[num_cond], condition, sizeof(cond_name[num_cond]));
}
*strchr(cond_name[num_cond], '=') = 0;
while (cond_name[num_cond][0] && isspace(cond_name[num_cond][strlen(cond_name[num_cond])-1]))
cond_name[num_cond][strlen(cond_name[num_cond])-1] = 0;
p3++;
while (*p3 && isspace(*p3))
p3++;
if (*p3 == '\"') {
strlcpy(cond_value[num_cond], p3+1, sizeof(cond_value[num_cond]));
while (cond_value[num_cond][0] && isspace(cond_value[num_cond][strlen(cond_value[num_cond])-1]))
cond_value[num_cond][strlen(cond_value[num_cond])-1] = 0;
if (cond_value[num_cond][0] && cond_value[num_cond][strlen(cond_value[num_cond])-1] == '\"')
cond_value[num_cond][strlen(cond_value[num_cond])-1] = 0;
} else if (*p3 == '\'') {
strlcpy(cond_value[num_cond], p3+1, sizeof(cond_value[num_cond]));
while (cond_value[num_cond][0] && isspace(cond_value[num_cond][strlen(cond_value[num_cond])-1]))
cond_value[num_cond][strlen(cond_value[num_cond])-1] = 0;
if (cond_value[num_cond][0] && cond_value[num_cond][strlen(cond_value[num_cond])-1] == '\'')
cond_value[num_cond][strlen(cond_value[num_cond])-1] = 0;
} else {
strlcpy(cond_value[num_cond], p3, sizeof(cond_value[num_cond]));
while (cond_value[num_cond][0] && isspace(cond_value[num_cond][strlen(cond_value[num_cond])-1]))
cond_value[num_cond][strlen(cond_value[num_cond])-1] = 0;
}
num_cond++;
}
}
}
cond_index = 0;
for (i=j=0 ; i<pnode->n_children ; i++) {
if (num_cond) {
cond_satisfied = 0;
for (k=0;k<num_cond;k++) {
if (cond_type[k]) {
/* search node with attribute */
if (strcmp(pnode->child[i].name, node_name) == 0)
if (mxml_get_attribute(pnode->child+i, cond_name[k]) &&
strcmp(mxml_get_attribute(pnode->child+i, cond_name[k]), cond_value[k]) == 0)