1016 lines
39 KiB
C
1016 lines
39 KiB
C
/* ezxml.c
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*
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* Copyright 2004-2006 Aaron Voisine <aaron@voisine.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <sys/types.h>
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#ifndef EZXML_NOMMAP
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#include <sys/mman.h>
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#endif // EZXML_NOMMAP
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#include <sys/stat.h>
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#include "ezxml.h"
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#define EZXML_WS "\t\r\n " // whitespace
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#define EZXML_ERRL 128 // maximum error string length
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typedef struct ezxml_root *ezxml_root_t;
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struct ezxml_root { // additional data for the root tag
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struct ezxml xml; // is a super-struct built on top of ezxml struct
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ezxml_t cur; // current xml tree insertion point
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char *m; // original xml string
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size_t len; // length of allocated memory for mmap, -1 for malloc
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char *u; // UTF-8 conversion of string if original was UTF-16
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char *s; // start of work area
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char *e; // end of work area
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char **ent; // general entities (ampersand sequences)
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char ***attr; // default attributes
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char ***pi; // processing instructions
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short standalone; // non-zero if <?xml standalone="yes"?>
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char err[EZXML_ERRL]; // error string
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};
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char *EZXML_NIL[] = { NULL }; // empty, null terminated array of strings
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// returns the first child tag with the given name or NULL if not found
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ezxml_t ezxml_child(ezxml_t xml, const char *name)
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{
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xml = (xml) ? xml->child : NULL;
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while (xml && strcmp(name, xml->name)) xml = xml->sibling;
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return xml;
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}
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// returns the Nth tag with the same name in the same subsection or NULL if not
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// found
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ezxml_t ezxml_idx(ezxml_t xml, int idx)
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{
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for (; xml && idx; idx--) xml = xml->next;
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return xml;
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}
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// returns the value of the requested tag attribute or NULL if not found
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const char *ezxml_attr(ezxml_t xml, const char *attr)
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{
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int i = 0, j = 1;
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ezxml_root_t root = (ezxml_root_t)xml;
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if (! xml || ! xml->attr) return NULL;
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while (xml->attr[i] && strcmp(attr, xml->attr[i])) i += 2;
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if (xml->attr[i]) return xml->attr[i + 1]; // found attribute
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while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag
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for (i = 0; root->attr[i] && strcmp(xml->name, root->attr[i][0]); i++);
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if (! root->attr[i]) return NULL; // no matching default attributes
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while (root->attr[i][j] && strcmp(attr, root->attr[i][j])) j += 3;
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return (root->attr[i][j]) ? root->attr[i][j + 1] : NULL; // found default
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}
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// same as ezxml_get but takes an already initialized va_list
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ezxml_t ezxml_vget(ezxml_t xml, va_list ap)
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{
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char *name = va_arg(ap, char *);
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int idx = -1;
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if (name && *name) {
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idx = va_arg(ap, int);
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xml = ezxml_child(xml, name);
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}
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return (idx < 0) ? xml : ezxml_vget(ezxml_idx(xml, idx), ap);
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}
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// Traverses the xml tree to retrieve a specific subtag. Takes a variable
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// length list of tag names and indexes. The argument list must be terminated
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// by either an index of -1 or an empty string tag name. Example:
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// title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1);
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// This retrieves the title of the 3rd book on the 1st shelf of library.
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// Returns NULL if not found.
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ezxml_t ezxml_get(ezxml_t xml, ...)
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{
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va_list ap;
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ezxml_t r;
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va_start(ap, xml);
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r = ezxml_vget(xml, ap);
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va_end(ap);
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return r;
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}
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// returns a null terminated array of processing instructions for the given
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// target
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const char **ezxml_pi(ezxml_t xml, const char *target)
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{
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ezxml_root_t root = (ezxml_root_t)xml;
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int i = 0;
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if (! root) return (const char **)EZXML_NIL;
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while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag
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while (root->pi[i] && strcmp(target, root->pi[i][0])) i++; // find target
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return (const char **)((root->pi[i]) ? root->pi[i] + 1 : EZXML_NIL);
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}
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// set an error string and return root
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ezxml_t ezxml_err(ezxml_root_t root, char *s, const char *err, ...)
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{
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va_list ap;
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int line = 1;
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char *t, fmt[EZXML_ERRL];
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for (t = root->s; t < s; t++) if (*t == '\n') line++;
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snprintf(fmt, EZXML_ERRL, "[error near line %d]: %s", line, err);
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va_start(ap, err);
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vsnprintf(root->err, EZXML_ERRL, fmt, ap);
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va_end(ap);
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return &root->xml;
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}
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// Recursively decodes entity and character references and normalizes new lines
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// ent is a null terminated array of alternating entity names and values. set t
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// to '&' for general entity decoding, '%' for parameter entity decoding, 'c'
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// for cdata sections, ' ' for attribute normalization, or '*' for non-cdata
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// attribute normalization. Returns s, or if the decoded string is longer than
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// s, returns a malloced string that must be freed.
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char *ezxml_decode(char *s, char **ent, char t)
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{
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char *e, *r = s, *m = s;
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long b, c, d, l;
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for (; *s; s++) { // normalize line endings
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while (*s == '\r') {
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*(s++) = '\n';
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if (*s == '\n') memmove(s, (s + 1), strlen(s));
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}
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}
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for (s = r; ; ) {
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while (*s && *s != '&' && (*s != '%' || t != '%') && !isspace(*s)) s++;
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if (! *s) break;
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else if (t != 'c' && ! strncmp(s, "&#", 2)) { // character reference
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if (s[2] == 'x') c = strtol(s + 3, &e, 16); // base 16
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else c = strtol(s + 2, &e, 10); // base 10
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if (! c || *e != ';') { s++; continue; } // not a character ref
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if (c < 0x80) *(s++) = c; // US-ASCII subset
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else { // multi-byte UTF-8 sequence
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for (b = 0, d = c; d; d /= 2) b++; // number of bits in c
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b = (b - 2) / 5; // number of bytes in payload
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*(s++) = (0xFF << (7 - b)) | (c >> (6 * b)); // head
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while (b) *(s++) = 0x80 | ((c >> (6 * --b)) & 0x3F); // payload
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}
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memmove(s, strchr(s, ';') + 1, strlen(strchr(s, ';')));
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}
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else if ((*s == '&' && (t == '&' || t == ' ' || t == '*')) ||
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(*s == '%' && t == '%')) { // entity reference
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for (b = 0; ent[b] && strncmp(s + 1, ent[b], strlen(ent[b]));
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b += 2); // find entity in entity list
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if (ent[b++]) { // found a match
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if ((c = strlen(ent[b])) - 1 > (e = strchr(s, ';')) - s) {
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l = (d = (s - r)) + c + strlen(e); // new length
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r = (r == m) ? strcpy(malloc(l), r) : realloc(r, l);
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e = strchr((s = r + d), ';'); // fix up pointers
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}
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memmove(s + c, e + 1, strlen(e)); // shift rest of string
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strncpy(s, ent[b], c); // copy in replacement text
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}
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else s++; // not a known entity
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}
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else if ((t == ' ' || t == '*') && isspace(*s)) *(s++) = ' ';
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else s++; // no decoding needed
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}
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if (t == '*') { // normalize spaces for non-cdata attributes
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for (s = r; *s; s++) {
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if ((l = strspn(s, " "))) memmove(s, s + l, strlen(s + l) + 1);
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while (*s && *s != ' ') s++;
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}
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if (--s >= r && *s == ' ') *s = '\0'; // trim any trailing space
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}
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return r;
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}
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// called when parser finds start of new tag
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void ezxml_open_tag(ezxml_root_t root, char *name, char **attr)
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{
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ezxml_t xml = root->cur;
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if (xml->name) xml = ezxml_add_child(xml, name, strlen(xml->txt));
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else xml->name = name; // first open tag
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xml->attr = attr;
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root->cur = xml; // update tag insertion point
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}
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// called when parser finds character content between open and closing tag
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void ezxml_char_content(ezxml_root_t root, char *s, size_t len, char t)
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{
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ezxml_t xml = root->cur;
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char *m = s;
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size_t l;
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if (! xml || ! xml->name || ! len) return; // sanity check
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s[len] = '\0'; // null terminate text (calling functions anticipate this)
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len = strlen(s = ezxml_decode(s, root->ent, t)) + 1;
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if (! *(xml->txt)) xml->txt = s; // initial character content
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else { // allocate our own memory and make a copy
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xml->txt = (xml->flags & EZXML_TXTM) // allocate some space
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? realloc(xml->txt, (l = strlen(xml->txt)) + len)
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: strcpy(malloc((l = strlen(xml->txt)) + len), xml->txt);
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strcpy(xml->txt + l, s); // add new char content
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if (s != m) free(s); // free s if it was malloced by ezxml_decode()
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}
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if (xml->txt != m) ezxml_set_flag(xml, EZXML_TXTM);
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}
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// called when parser finds closing tag
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ezxml_t ezxml_close_tag(ezxml_root_t root, char *name, char *s)
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{
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if (! root->cur || ! root->cur->name || strcmp(name, root->cur->name))
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return ezxml_err(root, s, "unexpected closing tag </%s>", name);
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root->cur = root->cur->parent;
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return NULL;
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}
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// checks for circular entity references, returns non-zero if no circular
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// references are found, zero otherwise
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int ezxml_ent_ok(char *name, char *s, char **ent)
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{
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int i;
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for (; ; s++) {
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while (*s && *s != '&') s++; // find next entity reference
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if (! *s) return 1;
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if (! strncmp(s + 1, name, strlen(name))) return 0; // circular ref.
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for (i = 0; ent[i] && strncmp(ent[i], s + 1, strlen(ent[i])); i += 2);
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if (ent[i] && ! ezxml_ent_ok(name, ent[i + 1], ent)) return 0;
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}
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}
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// called when the parser finds a processing instruction
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void ezxml_proc_inst(ezxml_root_t root, char *s, size_t len)
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{
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int i = 0, j = 1;
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char *target = s;
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s[len] = '\0'; // null terminate instruction
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if (*(s += strcspn(s, EZXML_WS))) {
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*s = '\0'; // null terminate target
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s += strspn(s + 1, EZXML_WS) + 1; // skip whitespace after target
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}
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if (! strcmp(target, "xml")) { // <?xml ... ?>
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if ((s = strstr(s, "standalone")) && ! strncmp(s + strspn(s + 10,
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EZXML_WS "='\"") + 10, "yes", 3)) root->standalone = 1;
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return;
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}
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if (! root->pi[0]) *(root->pi = malloc(sizeof(char **))) = NULL; //first pi
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while (root->pi[i] && strcmp(target, root->pi[i][0])) i++; // find target
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if (! root->pi[i]) { // new target
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root->pi = realloc(root->pi, sizeof(char **) * (i + 2));
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root->pi[i] = malloc(sizeof(char *) * 3);
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root->pi[i][0] = target;
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root->pi[i][1] = (char *)(root->pi[i + 1] = NULL); // terminate pi list
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root->pi[i][2] = strdup(""); // empty document position list
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}
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while (root->pi[i][j]) j++; // find end of instruction list for this target
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root->pi[i] = realloc(root->pi[i], sizeof(char *) * (j + 3));
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root->pi[i][j + 2] = realloc(root->pi[i][j + 1], j + 1);
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strcpy(root->pi[i][j + 2] + j - 1, (root->xml.name) ? ">" : "<");
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root->pi[i][j + 1] = NULL; // null terminate pi list for this target
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root->pi[i][j] = s; // set instruction
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}
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// called when the parser finds an internal doctype subset
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short ezxml_internal_dtd(ezxml_root_t root, char *s, size_t len)
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{
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char q, *c, *t, *n = NULL, *v, **ent, **pe;
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int i, j;
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pe = memcpy(malloc(sizeof(EZXML_NIL)), EZXML_NIL, sizeof(EZXML_NIL));
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for (s[len] = '\0'; s; ) {
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while (*s && *s != '<' && *s != '%') s++; // find next declaration
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if (! *s) break;
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else if (! strncmp(s, "<!ENTITY", 8)) { // parse entity definitions
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c = s += strspn(s + 8, EZXML_WS) + 8; // skip white space separator
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n = s + strspn(s, EZXML_WS "%"); // find name
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*(s = n + strcspn(n, EZXML_WS)) = ';'; // append ; to name
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v = s + strspn(s + 1, EZXML_WS) + 1; // find value
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if ((q = *(v++)) != '"' && q != '\'') { // skip externals
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s = strchr(s, '>');
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continue;
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}
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for (i = 0, ent = (*c == '%') ? pe : root->ent; ent[i]; i++);
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ent = realloc(ent, (i + 3) * sizeof(char *)); // space for next ent
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if (*c == '%') pe = ent;
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else root->ent = ent;
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*(++s) = '\0'; // null terminate name
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if ((s = strchr(v, q))) *(s++) = '\0'; // null terminate value
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ent[i + 1] = ezxml_decode(v, pe, '%'); // set value
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ent[i + 2] = NULL; // null terminate entity list
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if (! ezxml_ent_ok(n, ent[i + 1], ent)) { // circular reference
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if (ent[i + 1] != v) free(ent[i + 1]);
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ezxml_err(root, v, "circular entity declaration &%s", n);
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break;
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}
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else ent[i] = n; // set entity name
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}
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else if (! strncmp(s, "<!ATTLIST", 9)) { // parse default attributes
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t = s + strspn(s + 9, EZXML_WS) + 9; // skip whitespace separator
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if (! *t) { ezxml_err(root, t, "unclosed <!ATTLIST"); break; }
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if (*(s = t + strcspn(t, EZXML_WS ">")) == '>') continue;
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else *s = '\0'; // null terminate tag name
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for (i = 0; root->attr[i] && strcmp(n, root->attr[i][0]); i++);
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while (*(n = ++s + strspn(s, EZXML_WS)) && *n != '>') {
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if (*(s = n + strcspn(n, EZXML_WS))) *s = '\0'; // attr name
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else { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
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s += strspn(s + 1, EZXML_WS) + 1; // find next token
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c = (strncmp(s, "CDATA", 5)) ? "*" : " "; // is it cdata?
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if (! strncmp(s, "NOTATION", 8))
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s += strspn(s + 8, EZXML_WS) + 8;
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s = (*s == '(') ? strchr(s, ')') : s + strcspn(s, EZXML_WS);
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if (! s) { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
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s += strspn(s, EZXML_WS ")"); // skip white space separator
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if (! strncmp(s, "#FIXED", 6))
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s += strspn(s + 6, EZXML_WS) + 6;
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if (*s == '#') { // no default value
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s += strcspn(s, EZXML_WS ">") - 1;
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if (*c == ' ') continue; // cdata is default, nothing to do
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v = NULL;
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}
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else if ((*s == '"' || *s == '\'') && // default value
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(s = strchr(v = s + 1, *s))) *s = '\0';
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else { ezxml_err(root, t, "malformed <!ATTLIST"); break; }
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if (! root->attr[i]) { // new tag name
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root->attr = (! i) ? malloc(2 * sizeof(char **))
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: realloc(root->attr,
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(i + 2) * sizeof(char **));
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root->attr[i] = malloc(2 * sizeof(char *));
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root->attr[i][0] = t; // set tag name
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root->attr[i][1] = (char *)(root->attr[i + 1] = NULL);
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}
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for (j = 1; root->attr[i][j]; j += 3); // find end of list
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root->attr[i] = realloc(root->attr[i],
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(j + 4) * sizeof(char *));
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root->attr[i][j + 3] = NULL; // null terminate list
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root->attr[i][j + 2] = c; // is it cdata?
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root->attr[i][j + 1] = (v) ? ezxml_decode(v, root->ent, *c)
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: NULL;
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root->attr[i][j] = n; // attribute name
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}
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}
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else if (! strncmp(s, "<!--", 4)) s = strstr(s + 4, "-->"); // comments
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else if (! strncmp(s, "<?", 2)) { // processing instructions
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if ((s = strstr(c = s + 2, "?>")))
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ezxml_proc_inst(root, c, s++ - c);
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}
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else if (*s == '<') s = strchr(s, '>'); // skip other declarations
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else if (*(s++) == '%' && ! root->standalone) break;
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}
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free(pe);
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return ! *root->err;
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}
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// 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);
|
|
}
|
|
|
|
// Wrapper for ezxml_parse_str() that accepts a file stream. Reads the entire
|
|
// stream into memory and then parses it. For xml files, use ezxml_parse_file()
|
|
// or ezxml_parse_fd()
|
|
ezxml_t ezxml_parse_fp(FILE *fp)
|
|
{
|
|
ezxml_root_t root;
|
|
size_t l, len = 0;
|
|
char *s;
|
|
|
|
if (! (s = malloc(EZXML_BUFSIZE))) return NULL;
|
|
do {
|
|
len += (l = fread((s + len), 1, EZXML_BUFSIZE, fp));
|
|
if (l == EZXML_BUFSIZE) s = realloc(s, len + EZXML_BUFSIZE);
|
|
} while (s && l == EZXML_BUFSIZE);
|
|
|
|
if (! s) return NULL;
|
|
root = (ezxml_root_t)ezxml_parse_str(s, len);
|
|
root->len = -1; // so we know to free s in ezxml_free()
|
|
return &root->xml;
|
|
}
|
|
|
|
// A wrapper for ezxml_parse_str() that accepts a file descriptor. First
|
|
// attempts to mem map the file. Failing that, reads the file into memory.
|
|
// Returns NULL on failure.
|
|
ezxml_t ezxml_parse_fd(int fd)
|
|
{
|
|
ezxml_root_t root;
|
|
struct stat st;
|
|
size_t l;
|
|
void *m;
|
|
|
|
if (fd < 0) return NULL;
|
|
fstat(fd, &st);
|
|
|
|
#ifndef EZXML_NOMMAP
|
|
l = (st.st_size + sysconf(_SC_PAGESIZE) - 1) & ~(sysconf(_SC_PAGESIZE) -1);
|
|
if ((m = mmap(NULL, l, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0)) !=
|
|
MAP_FAILED) {
|
|
madvise(m, l, MADV_SEQUENTIAL); // optimize for sequential access
|
|
root = (ezxml_root_t)ezxml_parse_str(m, st.st_size);
|
|
madvise(m, root->len = l, MADV_NORMAL); // put it back to normal
|
|
}
|
|
else { // mmap failed, read file into memory
|
|
#endif // EZXML_NOMMAP
|
|
l = read(fd, m = malloc(st.st_size), st.st_size);
|
|
root = (ezxml_root_t)ezxml_parse_str(m, l);
|
|
root->len = -1; // so we know to free s in ezxml_free()
|
|
#ifndef EZXML_NOMMAP
|
|
}
|
|
#endif // EZXML_NOMMAP
|
|
return &root->xml;
|
|
}
|
|
|
|
// a wrapper for ezxml_parse_fd that accepts a file name
|
|
ezxml_t ezxml_parse_file(const char *file)
|
|
{
|
|
int fd = open(file, O_RDONLY, 0);
|
|
ezxml_t xml = ezxml_parse_fd(fd);
|
|
|
|
if (fd >= 0) close(fd);
|
|
return xml;
|
|
}
|
|
|
|
// Encodes ampersand sequences appending the results to *dst, reallocating *dst
|
|
// if length excedes max. a is non-zero for attribute encoding. Returns *dst
|
|
char *ezxml_ampencode(const char *s, size_t len, char **dst, size_t *dlen,
|
|
size_t *max, short a)
|
|
{
|
|
const char *e;
|
|
|
|
for (e = s + len; s != e; s++) {
|
|
while (*dlen + 10 > *max) *dst = realloc(*dst, *max += EZXML_BUFSIZE);
|
|
|
|
switch (*s) {
|
|
case '\0': return *dst;
|
|
case '&': *dlen += sprintf(*dst + *dlen, "&"); break;
|
|
case '<': *dlen += sprintf(*dst + *dlen, "<"); break;
|
|
case '>': *dlen += sprintf(*dst + *dlen, ">"); break;
|
|
case '"': *dlen += sprintf(*dst + *dlen, (a) ? """ : "\""); break;
|
|
case '\n': *dlen += sprintf(*dst + *dlen, (a) ? "
" : "\n"); break;
|
|
case '\t': *dlen += sprintf(*dst + *dlen, (a) ? "	" : "\t"); break;
|
|
case '\r': *dlen += sprintf(*dst + *dlen, "
"); break;
|
|
default: (*dst)[(*dlen)++] = *s;
|
|
}
|
|
}
|
|
return *dst;
|
|
}
|
|
|
|
// Recursively converts each tag to xml appending it to *s. Reallocates *s if
|
|
// its length excedes max. start is the location of the previous tag in the
|
|
// parent tag's character content. Returns *s.
|
|
char *ezxml_toxml_r(ezxml_t xml, char **s, size_t *len, size_t *max,
|
|
size_t start, char ***attr)
|
|
{
|
|
int i, j;
|
|
char *txt = (xml->parent) ? xml->parent->txt : "";
|
|
size_t off = 0;
|
|
|
|
// parent character content up to this tag
|
|
*s = ezxml_ampencode(txt + start, xml->off - start, s, len, max, 0);
|
|
|
|
while (*len + strlen(xml->name) + 4 > *max) // reallocate s
|
|
*s = realloc(*s, *max += EZXML_BUFSIZE);
|
|
|
|
*len += sprintf(*s + *len, "<%s", xml->name); // open tag
|
|
for (i = 0; xml->attr[i]; i += 2) { // tag attributes
|
|
if (ezxml_attr(xml, xml->attr[i]) != xml->attr[i + 1]) continue;
|
|
while (*len + strlen(xml->attr[i]) + 7 > *max) // reallocate s
|
|
*s = realloc(*s, *max += EZXML_BUFSIZE);
|
|
|
|
*len += sprintf(*s + *len, " %s=\"", xml->attr[i]);
|
|
ezxml_ampencode(xml->attr[i + 1], -1, s, len, max, 1);
|
|
*len += sprintf(*s + *len, "\"");
|
|
}
|
|
|
|
for (i = 0; attr[i] && strcmp(attr[i][0], xml->name); i++);
|
|
for (j = 1; attr[i] && attr[i][j]; j += 3) { // default attributes
|
|
if (! attr[i][j + 1] || ezxml_attr(xml, attr[i][j]) != attr[i][j + 1])
|
|
continue; // skip duplicates and non-values
|
|
while (*len + strlen(attr[i][j]) + 7 > *max) // reallocate s
|
|
*s = realloc(*s, *max += EZXML_BUFSIZE);
|
|
|
|
*len += sprintf(*s + *len, " %s=\"", attr[i][j]);
|
|
ezxml_ampencode(attr[i][j + 1], -1, s, len, max, 1);
|
|
*len += sprintf(*s + *len, "\"");
|
|
}
|
|
*len += sprintf(*s + *len, ">");
|
|
|
|
*s = (xml->child) ? ezxml_toxml_r(xml->child, s, len, max, 0, attr) //child
|
|
: ezxml_ampencode(xml->txt, -1, s, len, max, 0); //data
|
|
|
|
while (*len + strlen(xml->name) + 4 > *max) // reallocate s
|
|
*s = realloc(*s, *max += EZXML_BUFSIZE);
|
|
|
|
*len += sprintf(*s + *len, "</%s>", xml->name); // close tag
|
|
|
|
while (txt[off] && off < xml->off) off++; // make sure off is within bounds
|
|
return (xml->ordered) ? ezxml_toxml_r(xml->ordered, s, len, max, off, attr)
|
|
: ezxml_ampencode(txt + off, -1, s, len, max, 0);
|
|
}
|
|
|
|
// Converts an ezxml structure back to xml. Returns a string of xml data that
|
|
// must be freed.
|
|
char *ezxml_toxml(ezxml_t xml)
|
|
{
|
|
ezxml_t p = (xml) ? xml->parent : NULL, o = (xml) ? xml->ordered : NULL;
|
|
ezxml_root_t root = (ezxml_root_t)xml;
|
|
size_t len = 0, max = EZXML_BUFSIZE;
|
|
char *s = strcpy(malloc(max), ""), *t, *n;
|
|
int i, j, k;
|
|
|
|
if (! xml || ! xml->name) return realloc(s, len + 1);
|
|
while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag
|
|
|
|
for (i = 0; ! p && root->pi[i]; i++) { // pre-root processing instructions
|
|
for (k = 2; root->pi[i][k - 1]; k++);
|
|
for (j = 1; (n = root->pi[i][j]); j++) {
|
|
if (root->pi[i][k][j - 1] == '>') continue; // not pre-root
|
|
while (len + strlen(t = root->pi[i][0]) + strlen(n) + 7 > max)
|
|
s = realloc(s, max += EZXML_BUFSIZE);
|
|
len += sprintf(s + len, "<?%s%s%s?>\n", t, *n ? " " : "", n);
|
|
}
|
|
}
|
|
|
|
xml->parent = xml->ordered = NULL;
|
|
s = ezxml_toxml_r(xml, &s, &len, &max, 0, root->attr);
|
|
xml->parent = p;
|
|
xml->ordered = o;
|
|
|
|
for (i = 0; ! p && root->pi[i]; i++) { // post-root processing instructions
|
|
for (k = 2; root->pi[i][k - 1]; k++);
|
|
for (j = 1; (n = root->pi[i][j]); j++) {
|
|
if (root->pi[i][k][j - 1] == '<') continue; // not post-root
|
|
while (len + strlen(t = root->pi[i][0]) + strlen(n) + 7 > max)
|
|
s = realloc(s, max += EZXML_BUFSIZE);
|
|
len += sprintf(s + len, "\n<?%s%s%s?>", t, *n ? " " : "", n);
|
|
}
|
|
}
|
|
return realloc(s, len + 1);
|
|
}
|
|
|
|
// 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
|
|
#ifndef EZXML_NOMMAP
|
|
else if (root->len) munmap(root->m, root->len); // mem mapped xml data
|
|
#endif // EZXML_NOMMAP
|
|
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 the character content for the given tag and returns the tag
|
|
ezxml_t ezxml_set_txt(ezxml_t xml, const char *txt)
|
|
{
|
|
if (! xml) return NULL;
|
|
if (xml->flags & EZXML_TXTM) free(xml->txt); // existing txt was malloced
|
|
xml->flags &= ~EZXML_TXTM;
|
|
xml->txt = (char *)txt;
|
|
return xml;
|
|
}
|
|
|
|
// Sets the given tag attribute or adds a new attribute if not found. A value
|
|
// of NULL will remove the specified attribute. Returns the tag given.
|
|
ezxml_t ezxml_set_attr(ezxml_t xml, const char *name, const char *value)
|
|
{
|
|
int l = 0, c;
|
|
|
|
if (! xml) return NULL;
|
|
while (xml->attr[l] && strcmp(xml->attr[l], name)) l += 2;
|
|
if (! xml->attr[l]) { // not found, add as new attribute
|
|
if (! value) return xml; // nothing to do
|
|
if (xml->attr == EZXML_NIL) { // first attribute
|
|
xml->attr = malloc(4 * sizeof(char *));
|
|
xml->attr[1] = strdup(""); // empty list of malloced names/vals
|
|
}
|
|
else xml->attr = realloc(xml->attr, (l + 4) * sizeof(char *));
|
|
|
|
xml->attr[l] = (char *)name; // set attribute name
|
|
xml->attr[l + 2] = NULL; // null terminate attribute list
|
|
xml->attr[l + 3] = realloc(xml->attr[l + 1],
|
|
(c = strlen(xml->attr[l + 1])) + 2);
|
|
strcpy(xml->attr[l + 3] + c, " "); // set name/value as not malloced
|
|
if (xml->flags & EZXML_DUP) xml->attr[l + 3][c] = EZXML_NAMEM;
|
|
}
|
|
else if (xml->flags & EZXML_DUP) free((char *)name); // name was strduped
|
|
|
|
for (c = l; xml->attr[c]; c += 2); // find end of attribute list
|
|
if (xml->attr[c + 1][l / 2] & EZXML_TXTM) free(xml->attr[l + 1]); //old val
|
|
if (xml->flags & EZXML_DUP) xml->attr[c + 1][l / 2] |= EZXML_TXTM;
|
|
else xml->attr[c + 1][l / 2] &= ~EZXML_TXTM;
|
|
|
|
if (value) xml->attr[l + 1] = (char *)value; // set attribute value
|
|
else { // remove attribute
|
|
if (xml->attr[c + 1][l / 2] & EZXML_NAMEM) free(xml->attr[l]);
|
|
memmove(xml->attr + l, xml->attr + l + 2, (c - l + 2) * sizeof(char*));
|
|
xml->attr = realloc(xml->attr, (c + 2) * sizeof(char *));
|
|
memmove(xml->attr[c + 1] + (l / 2), xml->attr[c + 1] + (l / 2) + 1,
|
|
(c / 2) - (l / 2)); // fix list of which name/vals are malloced
|
|
}
|
|
xml->flags &= ~EZXML_DUP; // clear strdup() flag
|
|
return xml;
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
|
|
// removes a tag along with its subtags without freeing its memory
|
|
ezxml_t ezxml_cut(ezxml_t xml)
|
|
{
|
|
ezxml_t cur;
|
|
|
|
if (! xml) return NULL; // nothing to do
|
|
if (xml->next) xml->next->sibling = xml->sibling; // patch sibling list
|
|
|
|
if (xml->parent) { // not root tag
|
|
cur = xml->parent->child; // find head of subtag list
|
|
if (cur == xml) xml->parent->child = xml->ordered; // first subtag
|
|
else { // not first subtag
|
|
while (cur->ordered != xml) cur = cur->ordered;
|
|
cur->ordered = cur->ordered->ordered; // patch ordered list
|
|
|
|
cur = xml->parent->child; // go back to head of subtag list
|
|
if (strcmp(cur->name, xml->name)) { // not in first sibling list
|
|
while (strcmp(cur->sibling->name, xml->name))
|
|
cur = cur->sibling;
|
|
if (cur->sibling == xml) { // first of a sibling list
|
|
cur->sibling = (xml->next) ? xml->next
|
|
: cur->sibling->sibling;
|
|
}
|
|
else cur = cur->sibling; // not first of a sibling list
|
|
}
|
|
|
|
while (cur->next && cur->next != xml) cur = cur->next;
|
|
if (cur->next) cur->next = cur->next->next; // patch next list
|
|
}
|
|
}
|
|
xml->ordered = xml->sibling = xml->next = NULL;
|
|
return xml;
|
|
}
|
|
|
|
#ifdef EZXML_TEST // test harness
|
|
int main(int argc, char **argv)
|
|
{
|
|
ezxml_t xml;
|
|
char *s;
|
|
int i;
|
|
|
|
if (argc != 2) return fprintf(stderr, "usage: %s xmlfile\n", argv[0]);
|
|
|
|
xml = ezxml_parse_file(argv[1]);
|
|
printf("%s\n", (s = ezxml_toxml(xml)));
|
|
free(s);
|
|
i = fprintf(stderr, "%s", ezxml_error(xml));
|
|
ezxml_free(xml);
|
|
return (i) ? 1 : 0;
|
|
}
|
|
#endif // EZXML_TEST
|