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|
/* ezxml.c
*
* Copyright 2004-2006 Aaron Voisine <aaron@voisine.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "ezxml.h"
#define EZXML_WS "\t\r\n " // whitespace
#define EZXML_ERRL 128 // maximum error string length
typedef struct ezxml_root *ezxml_root_t;
struct ezxml_root { // additional data for the root tag
struct ezxml xml; // is a super-struct built on top of ezxml struct
ezxml_t cur; // current xml tree insertion point
char *m; // original xml string
size_t len; // length of allocated memory for mmap, -1 for malloc
char *u; // UTF-8 conversion of string if original was UTF-16
char *s; // start of work area
char *e; // end of work area
char **ent; // general entities (ampersand sequences)
char ***attr; // default attributes
char ***pi; // processing instructions
short standalone; // non-zero if <?xml standalone="yes"?>
char err[EZXML_ERRL]; // error string
};
char *EZXML_NIL[] = { NULL }; // empty, null terminated array of strings
// returns the first child tag with the given name or NULL if not found
ezxml_t ezxml_child(ezxml_t xml, const char *name)
{
xml = (xml) ? xml->child : NULL;
while (xml && strcmp(name, xml->name)) xml = xml->sibling;
return xml;
}
// returns the Nth tag with the same name in the same subsection or NULL if not
// found
ezxml_t ezxml_idx(ezxml_t xml, int idx)
{
for (; xml && idx; idx--) xml = xml->next;
return xml;
}
// returns the value of the requested tag attribute or NULL if not found
const char *ezxml_attr(ezxml_t xml, const char *attr)
{
int i = 0, j = 1;
ezxml_root_t root = (ezxml_root_t)xml;
if (! xml || ! xml->attr) return NULL;
while (xml->attr[i] && strcmp(attr, xml->attr[i])) i += 2;
if (xml->attr[i]) return xml->attr[i + 1]; // found attribute
while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag
for (i = 0; root->attr[i] && strcmp(xml->name, root->attr[i][0]); i++);
if (! root->attr[i]) return NULL; // no matching default attributes
while (root->attr[i][j] && strcmp(attr, root->attr[i][j])) j += 3;
return (root->attr[i][j]) ? root->attr[i][j + 1] : NULL; // found default
}
// same as ezxml_get but takes an already initialized va_list
ezxml_t ezxml_vget(ezxml_t xml, va_list ap)
{
char *name = va_arg(ap, char *);
int idx = -1;
if (name && *name) {
idx = va_arg(ap, int);
xml = ezxml_child(xml, name);
}
return (idx < 0) ? xml : ezxml_vget(ezxml_idx(xml, idx), ap);
}
// Traverses the xml tree to retrieve a specific subtag. Takes a variable
// length list of tag names and indexes. The argument list must be terminated
// by either an index of -1 or an empty string tag name. Example:
// title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1);
// This retrieves the title of the 3rd book on the 1st shelf of library.
// Returns NULL if not found.
ezxml_t ezxml_get(ezxml_t xml, ...)
{
va_list ap;
ezxml_t r;
va_start(ap, xml);
r = ezxml_vget(xml, ap);
va_end(ap);
return r;
}
// set an error string and return root
ezxml_t ezxml_err(ezxml_root_t root, char *s, const char *err, ...)
{
va_list ap;
int line = 1;
char *t, fmt[EZXML_ERRL];
for (t = root->s; t < s; t++) if (*t == '\n') line++;
snprintf(fmt, EZXML_ERRL, "[error near line %d]: %s", line, err);
va_start(ap, err);
vsnprintf(root->err, EZXML_ERRL, fmt, ap);
va_end(ap);
return &root->xml;
}
// Recursively decodes entity and character references and normalizes new lines
// ent is a null terminated array of alternating entity names and values. set t
// to '&' for general entity decoding, '%' for parameter entity decoding, 'c'
// for cdata sections, ' ' for attribute normalization, or '*' for non-cdata
// attribute normalization. Returns s, or if the decoded string is longer than
// s, returns a malloced string that must be freed.
char *ezxml_decode(char *s, char **ent, char t)
{
char *e, *r = s, *m = s;
long b, c, d, l;
for (; *s; s++) { // normalize line endings
while (*s == '\r') {
*(s++) = '\n';
if (*s == '\n') memmove(s, (s + 1), strlen(s));
}
}
for (s = r; ; ) {
while (*s && *s != '&' && (*s != '%' || t != '%') && !isspace(*s)) s++;
if (! *s) break;
else if (t != 'c' && ! strncmp(s, "&#", 2)) { // character reference
if (s[2] == 'x') c = strtol(s + 3, &e, 16); // base 16
else c = strtol(s + 2, &e, 10); // base 10
if (! c || *e != ';') { s++; continue; } // not a character ref
if (c < 0x80) *(s++) = c; // US-ASCII subset
else { // multi-byte UTF-8 sequence
for (b = 0, d = c; d; d /= 2) b++; // number of bits in c
b = (b - 2) / 5; // number of bytes in payload
*(s++) = (0xFF << (7 - b)) | (c >> (6 * b)); // head
while (b) *(s++) = 0x80 | ((c >> (6 * --b)) & 0x3F); // payload
}
memmove(s, strchr(s, ';') + 1, strlen(strchr(s, ';')));
}
else if ((*s == '&' && (t == '&' || t == ' ' || t == '*')) ||
(*s == '%' && t == '%')) { // entity reference
for (b = 0; ent[b] && strncmp(s + 1, ent[b], strlen(ent[b]));
b += 2); // find entity in entity list
if (ent[b++]) { // found a match
if ((c = strlen(ent[b])) - 1 > (e = strchr(s, ';')) - s) {
l = (d = (s - r)) + c + strlen(e); // new length
r = (r == m) ? strcpy(malloc(l), r) : realloc(r, l);
e = strchr((s = r + d), ';'); // fix up pointers
}
memmove(s + c, e + 1, strlen(e)); // shift rest of string
strncpy(s, ent[b], c); // copy in replacement text
}
else s++; // not a known entity
}
else if ((t == ' ' || t == '*') && isspace(*s)) *(s++) = ' ';
else s++; // no decoding needed
}
if (t == '*') { // normalize spaces for non-cdata attributes
for (s = r; *s; s++) {
if ((l = strspn(s, " "))) memmove(s, s + l, strlen(s + l) + 1);
while (*s && *s != ' ') s++;
}
if (--s >= r && *s == ' ') *s = '\0'; // trim any trailing space
}
return r;
}
// called when parser finds start of new tag
void ezxml_open_tag(ezxml_root_t root, char *name, char **attr)
{
ezxml_t xml = root->cur;
if (xml->name) xml = ezxml_add_child(xml, name, strlen(xml->txt));
else xml->name = name; // first open tag
xml->attr = attr;
root->cur = xml; // update tag insertion point
}
// called when parser finds character content between open and closing tag
void ezxml_char_content(ezxml_root_t root, char *s, size_t len, char t)
{
ezxml_t xml = root->cur;
char *m = s;
size_t l;
if (! xml || ! xml->name || ! len) return; // sanity check
s[len] = '\0'; // null terminate text (calling functions anticipate this)
len = strlen(s = ezxml_decode(s, root->ent, t)) + 1;
if (! *(xml->txt)) xml->txt = s; // initial character content
else { // allocate our own memory and make a copy
xml->txt = (xml->flags & EZXML_TXTM) // allocate some space
? realloc(xml->txt, (l = strlen(xml->txt)) + len)
: strcpy(malloc((l = strlen(xml->txt)) + len), xml->txt);
strcpy(xml->txt + l, s); // add new char content
if (s != m) free(s); // free s if it was malloced by ezxml_decode()
}
if (xml->txt != m) ezxml_set_flag(xml, EZXML_TXTM);
}
// called when parser finds closing tag
ezxml_t ezxml_close_tag(ezxml_root_t root, char *name, char *s)
{
if (! root->cur || ! root->cur->name || strcmp(name, root->cur->name))
return ezxml_err(root, s, "unexpected closing tag </%s>", name);
root->cur = root->cur->parent;
return NULL;
}
// checks for circular entity references, returns non-zero if no circular
// references are found, zero otherwise
int ezxml_ent_ok(char *name, char *s, char **ent)
{
int i;
for (; ; s++) {
while (*s && *s != '&') s++; // find next entity reference
if (! *s) return 1;
if (! strncmp(s + 1, name, strlen(name))) return 0; // circular ref.
for (i = 0; ent[i] && strncmp(ent[i], s + 1, strlen(ent[i])); i += 2);
if (ent[i] && ! ezxml_ent_ok(name, ent[i + 1], ent)) return 0;
}
}
// called when the parser finds a processing instruction
void ezxml_proc_inst(ezxml_root_t root, char *s, size_t len)
{
int i = 0, j = 1;
char *target = s;
s[len] = '\0'; // null terminate instruction
if (*(s += strcspn(s, EZXML_WS))) {
*s = '\0'; // null terminate target
s += strspn(s + 1, EZXML_WS) + 1; // skip whitespace after target
}
if (! strcmp(target, "xml")) { // <?xml ... ?>
if ((s = strstr(s, "standalone")) && ! strncmp(s + strspn(s + 10,
EZXML_WS "='\"") + 10, "yes", 3)) root->standalone = 1;
return;
}
if (! root->pi[0]) *(root->pi = malloc(sizeof(char **))) = NULL; //first pi
while (root->pi[i] && strcmp(target, root->pi[i][0])) i++; // find target
if (! root->pi[i]) { // new target
root->pi = realloc(root->pi, sizeof(char **) * (i + 2));
root->pi[i] = malloc(sizeof(char *) * 3);
root->pi[i][0] = target;
root->pi[i][1] = (char *)(root->pi[i + 1] = NULL); // terminate pi list
root->pi[i][2] = strdup(""); // empty document position list
}
while (root->pi[i][j]) j++; // find end of instruction list for this target
root->pi[i] = realloc(root->pi[i], sizeof(char *) * (j + 3));
root->pi[i][j + 2] = realloc(root->pi[i][j + 1], j + 1);
strcpy(root->pi[i][j + 2] + j - 1, (root->xml.name) ? ">" : "<");
root->pi[i][j + 1] = NULL; // null terminate pi list for this target
root->pi[i][j] = s; // set instruction
}
// called when the parser finds an internal doctype subset
short ezxml_internal_dtd(ezxml_root_t root, char *s, size_t len)
{
char q, *c, *t, *n = NULL, *v, **ent, **pe;
int i, j;
pe = memcpy(malloc(sizeof(EZXML_NIL)), EZXML_NIL, sizeof(EZXML_NIL));
for (s[len] = '\0'; s; ) {
while (*s && *s != '<' && *s != '%') s++; // find next declaration
if (! *s) break;
else if (! strncmp(s, "<!ENTITY", 8)) { // parse entity definitions
c = s += strspn(s + 8, EZXML_WS) + 8; // skip white space separator
n = s + strspn(s, EZXML_WS "%"); // find name
*(s = n + strcspn(n, EZXML_WS)) = ';'; // append ; to name
v = s + strspn(s + 1, EZXML_WS) + 1; // find value
if ((q = *(v++)) != '"' && q != '\'') { // skip externals
s = strchr(s, '>');
continue;
}
for (i = 0, ent = (*c == '%') ? pe : root->ent; ent[i]; i++);
ent = realloc(ent, (i + 3) * sizeof(char *)); // space for next ent
if (*c == '%') pe = ent;
else root->ent = ent;
*(++s) = '\0'; // null terminate name
if ((s = strchr(v, q))) *(s++) = '\0'; // null terminate value
ent[i + 1] = ezxml_decode(v, pe, '%'); // set value
ent[i + 2] = NULL; // null terminate entity list
if (! ezxml_ent_ok(n, ent[i + 1], ent)) { // circular reference
if (ent[i + 1] != v) free(ent[i + 1]);
ezxml_err(root, v, "circular entity declaration &%s", n);
break;
}
else ent[i] = n; // set entity name
}
else if (! strncmp(s, "<!ATTLIST", 9)) { // parse default attributes
t = s + strspn(s + 9, EZXML_WS) + 9; // skip whitespace separator
if (! *t) { ezxml_err(root, t, "unclosed <!ATTLIST"); break; }
if (*(s = t + strcspn(t, EZXML_WS ">")) == '>') continue;
else *s = '\0'; // null terminate tag name
for (i = 0; root->attr[i] && strcmp(n, root->attr[i][0]); i++);
while (*(n = ++s + strspn(s, EZXML_WS)) && *n != '>') {
if (*(s = n + strcspn(n, EZXML_WS))) *s = '\0'; // attr name
else { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
s += strspn(s + 1, EZXML_WS) + 1; // find next token
c = (strncmp(s, "CDATA", 5)) ? "*" : " "; // is it cdata?
if (! strncmp(s, "NOTATION", 8))
s += strspn(s + 8, EZXML_WS) + 8;
s = (*s == '(') ? strchr(s, ')') : s + strcspn(s, EZXML_WS);
if (! s) { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
s += strspn(s, EZXML_WS ")"); // skip white space separator
if (! strncmp(s, "#FIXED", 6))
s += strspn(s + 6, EZXML_WS) + 6;
if (*s == '#') { // no default value
s += strcspn(s, EZXML_WS ">") - 1;
if (*c == ' ') continue; // cdata is default, nothing to do
v = NULL;
}
else if ((*s == '"' || *s == '\'') && // default value
(s = strchr(v = s + 1, *s))) *s = '\0';
else { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
if (! root->attr[i]) { // new tag name
root->attr = (! i) ? malloc(2 * sizeof(char **))
: realloc(root->attr,
(i + 2) * sizeof(char **));
root->attr[i] = malloc(2 * sizeof(char *));
root->attr[i][0] = t; // set tag name
root->attr[i][1] = (char *)(root->attr[i + 1] = NULL);
}
for (j = 1; root->attr[i][j]; j += 3); // find end of list
root->attr[i] = realloc(root->attr[i],
(j + 4) * sizeof(char *));
root->attr[i][j + 3] = NULL; // null terminate list
root->attr[i][j + 2] = c; // is it cdata?
root->attr[i][j + 1] = (v) ? ezxml_decode(v, root->ent, *c)
: NULL;
root->attr[i][j] = n; // attribute name
}
}
else if (! strncmp(s, "<!--", 4)) s = strstr(s + 4, "-->"); // comments
else if (! strncmp(s, "<?", 2)) { // processing instructions
if ((s = strstr(c = s + 2, "?>")))
ezxml_proc_inst(root, c, s++ - c);
}
else if (*s == '<') s = strchr(s, '>'); // skip other declarations
else if (*(s++) == '%' && ! root->standalone) break;
}
free(pe);
return ! *root->err;
}
// Converts a UTF-16 string to UTF-8. Returns a new string that must be freed
// or NULL if no conversion was needed.
char *ezxml_str2utf8(char **s, size_t *len)
{
char *u;
size_t l = 0, sl, max = *len;
long c, d;
int b, be = (**s == '\xFE') ? 1 : (**s == '\xFF') ? 0 : -1;
if (be == -1) return NULL; // not UTF-16
u = malloc(max);
for (sl = 2; sl < *len - 1; sl += 2) {
c = (be) ? (((*s)[sl] & 0xFF) << 8) | ((*s)[sl + 1] & 0xFF) //UTF-16BE
: (((*s)[sl + 1] & 0xFF) << 8) | ((*s)[sl] & 0xFF); //UTF-16LE
if (c >= 0xD800 && c <= 0xDFFF && (sl += 2) < *len - 1) { // high-half
d = (be) ? (((*s)[sl] & 0xFF) << 8) | ((*s)[sl + 1] & 0xFF)
: (((*s)[sl + 1] & 0xFF) << 8) | ((*s)[sl] & 0xFF);
c = (((c & 0x3FF) << 10) | (d & 0x3FF)) + 0x10000;
}
while (l + 6 > max) u = realloc(u, max += EZXML_BUFSIZE);
if (c < 0x80) u[l++] = c; // US-ASCII subset
else { // multi-byte UTF-8 sequence
for (b = 0, d = c; d; d /= 2) b++; // bits in c
b = (b - 2) / 5; // bytes in payload
u[l++] = (0xFF << (7 - b)) | (c >> (6 * b)); // head
while (b) u[l++] = 0x80 | ((c >> (6 * --b)) & 0x3F); // payload
}
}
return *s = realloc(u, *len = l);
}
// frees a tag attribute list
void ezxml_free_attr(char **attr) {
int i = 0;
char *m;
if (! attr || attr == EZXML_NIL) return; // nothing to free
while (attr[i]) i += 2; // find end of attribute list
m = attr[i + 1]; // list of which names and values are malloced
for (i = 0; m[i]; i++) {
if (m[i] & EZXML_NAMEM) free(attr[i * 2]);
if (m[i] & EZXML_TXTM) free(attr[(i * 2) + 1]);
}
free(m);
free(attr);
}
// parse the given xml string and return an ezxml structure
ezxml_t ezxml_parse_str(char *s, size_t len)
{
ezxml_root_t root = (ezxml_root_t)ezxml_new(NULL);
char q, e, *d, **attr, **a = NULL; // initialize a to avoid compile warning
int l, i, j;
root->m = s;
if (! len) return ezxml_err(root, NULL, "root tag missing");
root->u = ezxml_str2utf8(&s, &len); // convert utf-16 to utf-8
root->e = (root->s = s) + len; // record start and end of work area
e = s[len - 1]; // save end char
s[len - 1] = '\0'; // turn end char into null terminator
while (*s && *s != '<') s++; // find first tag
if (! *s) return ezxml_err(root, s, "root tag missing");
for (; ; ) {
attr = (char **)EZXML_NIL;
d = ++s;
if (isalpha(*s) || *s == '_' || *s == ':' || *s < '\0') { // new tag
if (! root->cur)
return ezxml_err(root, d, "markup outside of root element");
s += strcspn(s, EZXML_WS "/>");
while (isspace(*s)) *(s++) = '\0'; // null terminate tag name
if (*s && *s != '/' && *s != '>') // find tag in default attr list
for (i = 0; (a = root->attr[i]) && strcmp(a[0], d); i++);
for (l = 0; *s && *s != '/' && *s != '>'; l += 2) { // new attrib
attr = (l) ? realloc(attr, (l + 4) * sizeof(char *))
: malloc(4 * sizeof(char *)); // allocate space
attr[l + 3] = (l) ? realloc(attr[l + 1], (l / 2) + 2)
: malloc(2); // mem for list of maloced vals
strcpy(attr[l + 3] + (l / 2), " "); // value is not malloced
attr[l + 2] = NULL; // null terminate list
attr[l + 1] = ""; // temporary attribute value
attr[l] = s; // set attribute name
s += strcspn(s, EZXML_WS "=/>");
if (*s == '=' || isspace(*s)) {
*(s++) = '\0'; // null terminate tag attribute name
q = *(s += strspn(s, EZXML_WS "="));
if (q == '"' || q == '\'') { // attribute value
attr[l + 1] = ++s;
while (*s && *s != q) s++;
if (*s) *(s++) = '\0'; // null terminate attribute val
else {
ezxml_free_attr(attr);
return ezxml_err(root, d, "missing %c", q);
}
for (j = 1; a && a[j] && strcmp(a[j], attr[l]); j +=3);
attr[l + 1] = ezxml_decode(attr[l + 1], root->ent, (a
&& a[j]) ? *a[j + 2] : ' ');
if (attr[l + 1] < d || attr[l + 1] > s)
attr[l + 3][l / 2] = EZXML_TXTM; // value malloced
}
}
while (isspace(*s)) s++;
}
if (*s == '/') { // self closing tag
*(s++) = '\0';
if ((*s && *s != '>') || (! *s && e != '>')) {
if (l) ezxml_free_attr(attr);
return ezxml_err(root, d, "missing >");
}
ezxml_open_tag(root, d, attr);
ezxml_close_tag(root, d, s);
}
else if ((q = *s) == '>' || (! *s && e == '>')) { // open tag
*s = '\0'; // temporarily null terminate tag name
ezxml_open_tag(root, d, attr);
*s = q;
}
else {
if (l) ezxml_free_attr(attr);
return ezxml_err(root, d, "missing >");
}
}
else if (*s == '/') { // close tag
s += strcspn(d = s + 1, EZXML_WS ">") + 1;
if (! (q = *s) && e != '>') return ezxml_err(root, d, "missing >");
*s = '\0'; // temporarily null terminate tag name
if (ezxml_close_tag(root, d, s)) return &root->xml;
if (isspace(*s = q)) s += strspn(s, EZXML_WS);
}
else if (! strncmp(s, "!--", 3)) { // xml comment
if (! (s = strstr(s + 3, "--")) || (*(s += 2) != '>' && *s) ||
(! *s && e != '>')) return ezxml_err(root, d, "unclosed <!--");
}
else if (! strncmp(s, "![CDATA[", 8)) { // cdata
if ((s = strstr(s, "]]>")))
ezxml_char_content(root, d + 8, (s += 2) - d - 10, 'c');
else return ezxml_err(root, d, "unclosed <![CDATA[");
}
else if (! strncmp(s, "!DOCTYPE", 8)) { // dtd
for (l = 0; *s && ((! l && *s != '>') || (l && (*s != ']' ||
*(s + strspn(s + 1, EZXML_WS) + 1) != '>')));
l = (*s == '[') ? 1 : l) s += strcspn(s + 1, "[]>") + 1;
if (! *s && e != '>')
return ezxml_err(root, d, "unclosed <!DOCTYPE");
d = (l) ? strchr(d, '[') + 1 : d;
if (l && ! ezxml_internal_dtd(root, d, s++ - d)) return &root->xml;
}
else if (*s == '?') { // <?...?> processing instructions
do { s = strchr(s, '?'); } while (s && *(++s) && *s != '>');
if (! s || (! *s && e != '>'))
return ezxml_err(root, d, "unclosed <?");
else ezxml_proc_inst(root, d + 1, s - d - 2);
}
else return ezxml_err(root, d, "unexpected <");
if (! s || ! *s) break;
*s = '\0';
d = ++s;
if (*s && *s != '<') { // tag character content
while (*s && *s != '<') s++;
if (*s) ezxml_char_content(root, d, s - d, '&');
else break;
}
else if (! *s) break;
}
if (! root->cur) return &root->xml;
else if (! root->cur->name) return ezxml_err(root, d, "root tag missing");
else return ezxml_err(root, d, "unclosed tag <%s>", root->cur->name);
}
// free the memory allocated for the ezxml structure
void ezxml_free(ezxml_t xml)
{
ezxml_root_t root = (ezxml_root_t)xml;
int i, j;
char **a, *s;
if (! xml) return;
ezxml_free(xml->child);
ezxml_free(xml->ordered);
if (! xml->parent) { // free root tag allocations
for (i = 10; root->ent[i]; i += 2) // 0 - 9 are default entites (<>&"')
if ((s = root->ent[i + 1]) < root->s || s > root->e) free(s);
free(root->ent); // free list of general entities
for (i = 0; (a = root->attr[i]); i++) {
for (j = 1; a[j++]; j += 2) // free malloced attribute values
if (a[j] && (a[j] < root->s || a[j] > root->e)) free(a[j]);
free(a);
}
if (root->attr[0]) free(root->attr); // free default attribute list
for (i = 0; root->pi[i]; i++) {
for (j = 1; root->pi[i][j]; j++);
free(root->pi[i][j + 1]);
free(root->pi[i]);
}
if (root->pi[0]) free(root->pi); // free processing instructions
if (root->len == -1) free(root->m); // malloced xml data
if (root->u) free(root->u); // utf8 conversion
}
ezxml_free_attr(xml->attr); // tag attributes
if ((xml->flags & EZXML_TXTM)) free(xml->txt); // character content
if ((xml->flags & EZXML_NAMEM)) free(xml->name); // tag name
free(xml);
}
// return parser error message or empty string if none
const char *ezxml_error(ezxml_t xml)
{
while (xml && xml->parent) xml = xml->parent; // find root tag
return (xml) ? ((ezxml_root_t)xml)->err : "";
}
// returns a new empty ezxml structure with the given root tag name
ezxml_t ezxml_new(const char *name)
{
static char *ent[] = { "lt;", "<", "gt;", ">", "quot;", """,
"apos;", "'", "amp;", "&", NULL };
ezxml_root_t root = (ezxml_root_t)memset(malloc(sizeof(struct ezxml_root)),
'\0', sizeof(struct ezxml_root));
root->xml.name = (char *)name;
root->cur = &root->xml;
strcpy(root->err, root->xml.txt = "");
root->ent = memcpy(malloc(sizeof(ent)), ent, sizeof(ent));
root->attr = root->pi = (char ***)(root->xml.attr = EZXML_NIL);
return &root->xml;
}
// inserts an existing tag into an ezxml structure
ezxml_t ezxml_insert(ezxml_t xml, ezxml_t dest, size_t off)
{
ezxml_t cur, prev, head;
xml->next = xml->sibling = xml->ordered = NULL;
xml->off = off;
xml->parent = dest;
if ((head = dest->child)) { // already have sub tags
if (head->off <= off) { // not first subtag
for (cur = head; cur->ordered && cur->ordered->off <= off;
cur = cur->ordered);
xml->ordered = cur->ordered;
cur->ordered = xml;
}
else { // first subtag
xml->ordered = head;
dest->child = xml;
}
for (cur = head, prev = NULL; cur && strcmp(cur->name, xml->name);
prev = cur, cur = cur->sibling); // find tag type
if (cur && cur->off <= off) { // not first of type
while (cur->next && cur->next->off <= off) cur = cur->next;
xml->next = cur->next;
cur->next = xml;
}
else { // first tag of this type
if (prev && cur) prev->sibling = cur->sibling; // remove old first
xml->next = cur; // old first tag is now next
for (cur = head, prev = NULL; cur && cur->off <= off;
prev = cur, cur = cur->sibling); // new sibling insert point
xml->sibling = cur;
if (prev) prev->sibling = xml;
}
}
else dest->child = xml; // only sub tag
return xml;
}
// Adds a child tag. off is the offset of the child tag relative to the start
// of the parent tag's character content. Returns the child tag.
ezxml_t ezxml_add_child(ezxml_t xml, const char *name, size_t off)
{
ezxml_t child;
if (! xml) return NULL;
child = (ezxml_t)memset(malloc(sizeof(struct ezxml)), '\0',
sizeof(struct ezxml));
child->name = (char *)name;
child->attr = EZXML_NIL;
child->txt = "";
return ezxml_insert(child, xml, off);
}
// sets a flag for the given tag and returns the tag
ezxml_t ezxml_set_flag(ezxml_t xml, short flag)
{
if (xml) xml->flags |= flag;
return xml;
}
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