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xmlc.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "xmlc.h"
/*
* Simple XML parser & generator
* This is not a conforming parser.
* supports creation of elements, attributes and text.
* associating attributes with elements assigning children to
* elements parses an XML. Does not yet support entity parsing and
* internal and external entity reference resolution.
* It however supports default entity reference resolution
* Is not a validating parser.
* Nodes created are similar to DOM
* limited selection through xpath is supported.
* Care is taken to update
*
* Author: Gopal Ananthraman
* Release Version : 1.0
*
*/
static char buffer[BUFFER_SIZE];
static char tmp[BUFFER_SIZE];
/* INTERNAL */
void destroy_element(xml_element * e) {
if(e) {
free(e->name);
free(e);
}
}
/* Use this to free the tree */
void destroy_node(xml_node * node) {
xml_node *p, *q;
if(node == NULL)
return;
p = node->child;
while(p) {
q = p->sibling;
destroy_node(p);
p = q;
}
if(node->name) {
free(node->name);
node->name = NULL;
}
if(node->text) {
free(node->text);
node->text = NULL;
}
free(node);
/* node's parent is not updated etc...*/
}
/* INTERNAL */
char * location(stream_t * stream) {
int len = stream->runlength;
len -= (ERROR_BUFFER_SIZE - 1);
if(len < 0) {
memcpy(&tmp[0], &stream->buf[0],
stream->runlength);
tmp[stream->runlength - 1] = 0;
} else {
memcpy(&tmp[0], &stream->buf[len],
ERROR_BUFFER_SIZE - 1);
tmp[ERROR_BUFFER_SIZE -1] = 0;
}
return &tmp[0];
}
/* INTERNAL */
void unget_c(stream_t * stream, int count) {
int len = stream->runlength;
if(count > HALF_SIZE) {
count = HALF_SIZE;
}
len -= count;
if(len < 0) {
if(stream->lastactivezone == 2)
len += BUFFER_SIZE;
else
len = 0;
}
stream->runlength = len;
}
/* INTERNAL */
int get_c(stream_t * stream) {
char * buf = NULL;
int size = -1;
if(stream->length > 0 && stream->length < HALF_SIZE) {
if((stream->runlength == stream->length) ||
(stream->runlength == stream->length + HALF_SIZE))
return -19; // EOF
}
if(stream->runlength == HALF_SIZE && stream->activezone == 1) {
size = HALF_SIZE;
stream->activezone = 2;
stream->lastactivezone = 1;
} else if (stream->runlength == BUFFER_SIZE) {
stream->runlength = 0;
if(stream->activezone == 2) {
size = 0;
stream->activezone = 1;
stream->lastactivezone = 2;
}
}
if(size >= 0) {
if (feof(stream->fp)) {
return -19;
}
clearerr(stream->fp);
stream->length = fread(&buffer[size], sizeof(char),
HALF_SIZE, stream->fp);
if(ferror(stream->fp)){
perror("Stream Error");
return -18;
}
}
return stream->buf[stream->runlength++];
}
/* INTERNAL */
int raise_error(int code, char * src, char* error, char* arg1) {
printf(error, (arg1 ? arg1 : ""));
printf("Location: %s\n", (src ? src : ""));
return code;
}
/**
* Use this API to parse XML with default configs
* fp --> pointer to XML file to read
* root --> typically allocated memory for the root doc.
*/
int parsexml(void * fp, xml_element ** root) {
config_t config;
config.parsecomment = 0L;
return parse(fp, root, config);
}
/**
* Use this API to parse XML with passed in configuration
* fp --> pointer to XML file to read
* root --> typically allocated memory for the root doc.
* config --> configuration properties that affect parsing
* not much now, affects say comments parsing
*/
int parse(void * fp, xml_element ** root, config_t config) {
int len = 0;
xml_node * document = NULL;
int ret = 0;
stream_t *stream = (stream_t *)malloc(sizeof(stream_t));
stream->buf = &buffer[0];
stream->runlength = 0;
stream->activezone = 1;
stream->lastactivezone = -1;
stream->fp = (FILE *)fp;
stream->config = config;
stream->length = fread(buffer, sizeof(char),
HALF_SIZE, stream->fp);
if(ferror(stream->fp)) {
*root = NULL;
return -18;
}
document = create_document();
ret = parse_node(stream, document);
*root = document;
return ret;
}
/* INTERNAL */
/* Recursive descent begins here */
/* Root point for an XML node parse */
int parse_node(stream_t * stream, xml_node * parent) {
int c,c1,c2,c3;
for(;;) {
c = skip_whitespaces(stream);
RAISE_ERROR(c, -24, stream, "Error while trimming spaces in node", "")
c = get_c(stream);
if(c == ENDOFFILE) //EOF is fine
return 0;
if(c == '<') {
char * name = NULL;
c1 = get_c(stream);
RAISE_ERROR(c1, -1, stream, "Incomplete tag", "")
c2 = get_c(stream);
RAISE_ERROR(c2, -2, stream, "Incomplete tag", "")
c3 = get_c(stream);
RAISE_ERROR(c3, -3, stream, "Incomplete tag", "")
if(c == -19)
return 0;
if(c1 == '!' && c2 == '-' && c3 =='-') {
int ret;
if(stream->config.parsecomment) {
ret = parse_comment(stream, parent);
} else {
ret = scan_comment(stream);
}
RAISE_ERROR(ret, -4, stream, "Error While scanning for comments", "")
} else {
unget_c(stream, 4);
/* This means, We are parsing the end tag at the wrong level, return success */
if(c1 == '/') {
return 0;
}
if( '!' == c1) {
parse_entity(stream, parent);
} else if ('?' == c1) {
parse_PI(stream, parent);
} else {
parse_element(stream, parent);
}
}
} else {
unget_c(stream, 1);
parse_text(stream, parent);
}
}
}
/* INTERNAL */
/* XML Entity */
int parse_entity(stream_t * stream, xml_node * parent) {
int c = get_c(stream);
int c1 = get_c(stream);
char * q = &tmp[0];
xml_node * entity;
char * text;
if(c == '<' && c1 == '!') {
for(;;) {
c = get_c(stream);
RAISE_ERROR(c, -31, stream, "Invalid Entity name", "")
if(c <= 0x20) {
*q = 0;
break;
}
*q++ = c;
}
q = &tmp[0];
if(*q == 0) {
RAISE_ERROR(-32, -31, stream, "Invalid Entity", "")
}
entity = create_entity(q);
c = read_text(stream, '>', NULL, &text);
RAISE_ERROR(c, -5, stream, "Invalid Entity values", "");
entity->text = text;
add_childorsibling(parent, entity);
#ifdef DEBUG
if(stream->config.nodeflush) {
print(entity, stream->config.fp, 0);
}
#endif
}
return 0;
}
/* INTERNAL */
int pi_end_token(stream_t * stream) {
int c1 = get_c(stream);
if(c1 < 0)
return c1;
if(c1 == '>')
return 1;
unget_c(stream, 1);
return 0;
}
/* INTERNAL.
* Processing Instruction parsing
*/
int parse_PI(stream_t * stream, xml_node * parent) {
int c = get_c(stream);
int c1 = get_c(stream);
int c2 = get_c(stream);
int c3 = get_c(stream);
int c4 = get_c(stream);
char * text = NULL;
xml_element * elt = NULL;
if(c == '<' && c1 == '?' &&
(c2 =='x' || c2 =='X') &&
(c3 =='m' || c3 =='M') &&
(c4 =='l' || c4 =='L')) {
int child = 0;
elt = create_PI("xml");
c = read_text(stream, '?', pi_end_token, &text);
RAISE_ERROR(c, -5, stream, "Invalid Processing Instruction", "");
elt->text = text;
add_childorsibling(parent, elt);
#ifdef DEBUG
if(stream->config.nodeflush) {
print(elt, stream->config.fp, 0);
}
#endif
return 0;
}
unget_c(stream, 5);
return -33;
}
/* INTERNAL */
int cdata_end_token(stream_t * stream) {
int c1;
c1 = get_c(stream);
if(c1 < 0)
return c1;
if(c1 == ']') {
c1 = get_c(stream);
if(c1 < 0)
return c1;
if( c1 == '>') {
return 1;
} else {
unget_c(stream, 1);
unget_c(stream, 1);
}
} else {
unget_c(stream, 1);
}
return 0;
}
/* INTERNAL */
/* CDATA Section parsing */
int parse_cdata(stream_t * stream, xml_node * parent) {
int ch[9];
int i = 0;
char * text = NULL;
xml_node * node;
for(; i < sizeof(ch); i++) {
ch[i] = get_c(stream);
RAISE_ERROR(ch[i], -5, stream, "Incomplete tag", "")
}
if(memcmp(ch, "<![CDATA[", sizeof(ch)) == 0) {
ch[0] = read_text(stream, ']', cdata_end_token, &text);
RAISE_ERROR(ch[0], -8, stream, "Error while reading CDATA", "")
node = create_CDATA(text);
add_childorsibling(parent, node);
#ifdef DEBUG
if(stream->config.nodeflush) {
print(node, stream->config.fp, 0);
}
#endif
return 0;
}
unget_c(stream, 9);
return -25;
}
/* INTERNAL */
int parse_text(stream_t * stream, xml_element * parent) {
char * text = NULL;
xml_node * node;
int c = read_text(stream, '<', NULL, &text);
if(c == -10) {
RAISE_ERROR(c, -10, stream, "Error while looking for text end char for elt %s",
parent->name)
} else if(c == -11) {
RAISE_ERROR(c, -11, stream, "Text too big for %s", parent->name)
}
RAISE_ERROR(c, c, stream, "Invalid text at %s", parent->name)
node = create_text(text);
free(text);
add_childorsibling(parent, node);
#ifdef DEBUG
if(stream->config.nodeflush) {
print(node, stream->config.fp, 0);
}
#endif
return 0;
}
/* INTERNAL */
int read_text(stream_t * stream, int endchar, pfn_end_token is_endtoken, char ** ptext) {
char * text = NULL;
int count = 0;
int size = 0;
int c;
int flag = 0L;
for(;;) {
c = get_c(stream);
if(c < 0)
return -10;
/* check for end condition */
if(c == endchar) {
if(is_endtoken) {
flag = is_endtoken(stream);
if(flag < 0) return flag;
} else {
flag = 1L;
}
}
if(flag == 1L || count == sizeof(tmp)) {
int alloclen = size + count
+ ((flag == 1L) ? 1 : 0);
char * p = realloc(text, alloclen);
if(!p) {
if(text != NULL) {
text[size -1] = 0;
}
*ptext = text;
return -11;
}
text = p;
memcpy(&text[size], tmp, count);
size = alloclen;
if(flag == 1L) {
text[size -1] = 0;
*ptext = text;
break;
}
count = 0;
}
tmp[count++] = c;
}
return 0;
}
/* INTERNAL */
/* Element parsed here */
int parse_element(stream_t * stream, xml_element * parent) {
int c;
char * q = &tmp[0];
xml_element * elt;
int child = 1L;
c = get_c(stream);
if( c != '<') {
RAISE_ERROR(-12, -12, stream, "Element should begin with < symbol", "")
}
while(1) {
c = get_c(stream);
RAISE_ERROR(c, -12, stream, "stream error while reading element", "")
if(c <= 0x20 || c == '>') {
*q = 0;
break;
}
*q++ = c;
}
if( c == '>') {
if(q != &tmp[0] && *--q == '/') {
*q = 0;
child = 0L;
}
}
q = &tmp[0];
if(q == NULL || !*q ) {
RAISE_ERROR(-13, -13, stream, "Invalid element name", "")
}
/* name */
elt = create_element(q);
/* attributes */
if(c <= 0x20) {
c = parse_attributes(stream, elt, &child);
if( c < 0)
return c;
}
if(child) {
parse_node(stream, elt);
q = &tmp[0];
while(1) {
c = get_c(stream);
RAISE_ERROR(c, -16, stream, "reading element %s end tag", elt->name)
if(c == '<') {
if((c = get_c(stream)) == '/')
continue;
else {
RAISE_ERROR(c, -17, stream, "No End tag for %s", elt->name)
}
}
if(c == '>') {
*q = 0;
break;
}
*q++ = c;
}
if(strcmp(elt->name, &tmp[0])) {
RAISE_ERROR(-22, -22, stream, "Invalid end tag for %s", elt->name)
}
}
add_childorsibling(parent, elt);
#ifdef DEBUG
if(stream->config.nodeflush) {
print(elt, stream->config.fp, 0);
}
#endif
return 0;
}
/* XML Attributes */
int parse_attributes(stream_t * stream, xml_element * elt, int * pchild) {
int inquote = 0;
int c;
char * q = &tmp[0];
c = skip_whitespaces(stream);
RAISE_ERROR(c, -23, stream, "Error while trimming spaces in element %s", elt->name)
for(;;) {
c = get_c(stream);
RAISE_ERROR(c, -13, stream,
"Stream error while processing for attributes at %s", elt->name)
if( c == '>') {
*q = 0;
if(q != &tmp[0] && *--q == '/') {
*q = 0;
*pchild = 0L;
}
q = &tmp[0];
c = parse_attr(q, elt);
RAISE_ERROR(c, -14, , stream, "Invalid attribute %s", &tmp[0])
break;
}
if( c == '"') {
inquote = !inquote;
}
if(c <= 0x20 && !inquote) {
*q = 0;
q = &tmp[0];
c = parse_attr(q, elt);
RAISE_ERROR(c, -15, stream, "Invalid attribute %s", &tmp[0])
c = skip_whitespaces(stream);
RAISE_ERROR(c, -23, stream, "Error while trimming spaces in element %s", elt->name)
continue;
}
*q++ = c;
}
return 0;
}
/* INTERNAL */
int skip_whitespaces(stream_t * stream) {
int c;
for(;;) {
c = get_c(stream);
if( c < 0)
return c;
if(c <= 0x20) {
continue;
} else {
unget_c(stream, 1);
break;
}
}
return c;
}
/*
* Parse attributes
*/
int parse_attr(char * p, xml_element * elt) {
char * eq;
char * val;
char * q;
if(!p || !*p) {
return 0;
}
eq = strrchr(p, '=');
/* + 2 for the quote '"' */
q = val = ((eq && *(eq + 1)) ? eq + 2: eq);
if(!eq) {
return -12;
}
*eq = 0;
while(*q) {
if(*q == '"') {
*q = 0;
break;
}
q++;
}
add_attribute(elt, create_attribute(p, *val ? val : ""));
return *q;
}
/* INTERNAL */
int comment_end_token(stream_t * stream) {
int c1;
c1 = get_c(stream);
if(c1 < 0)
return c1;
if(c1 == '-') {
c1 = get_c(stream);
if(c1 < 0)
return c1;
if( c1 == '>') {
return 1;
} else {
unget_c(stream, 1);
unget_c(stream, 1);
}
} else {
unget_c(stream, 1);
}
return 0;
}
/*
*
* Parse comments
*
*/
int parse_comment(stream_t * stream, xml_node * parent) {
char * comment = NULL;
xml_node * node;
int c = read_text(stream, '-', comment_end_token, &comment);
if(c == -10) {
RAISE_ERROR(c, -10, stream, "Error while looking for comment end char for %s", parent->name)
} else if(c == -11) {
RAISE_ERROR(c, -11, stream, "Comment size too big for %s", parent->name)
}
if(comment && *comment) {
node = create_comment(comment);
add_childorsibling(parent, node);
}
#ifdef DEBUG
if(stream->config.nodeflush) {
print(node, stream->config.fp, 0);
}
#endif
return 0;
}
/* INTERNAL */
int scan_comment(stream_t * stream) {
int c1, c2 ,c;
c1 = c2 = c = 0;
for(;;) {
c2 = c1;
c1 = c;
c = get_c(stream);
if ( c < 0) return -4;
if(c == '>' && c1 =='-' && c2 =='-')
return c;
}
/* to shut the compiler */
return 0;
}
/* Use print to print a tree from a given node */
void print(xml_node * node, void *fp, int depth) {
FILE * file = (FILE *)fp;
int i = 0;
if( node == NULL || file == NULL) {
return;
}
for(; i < depth; i++) {
fprintf(file, "%c", '\t');
}
if(node->type == ELEMENT) {
xml_element * element = node;
fprintf(file, "<%s", element->name);
if(element->attributes) {
xml_attribute * p = element->attributes;
for (p = element->attributes; p; p = p->next) {
fprintf(file, " %s=\"%s\"", p->name, p->value);
}
}
if(node->child)
fprintf(file, "%c\n", '>');
else {
fprintf(file, "%s\n", "/>");
}
} else if ( node->type == CDATA) {
fprintf(file, "<![CDATA[%s\n]]>", node->text);
} else if (node->type == COMMENT) {
fprintf(file, "<!--%s-->", node->text);
} else if (node->type == TEXT) {/* text */
fprintf(file, "%s", node->text);
} else if (node->type == ENTITY) {
fprintf(file, "<!%s %s>\n", node->name, node->text);
} else if (node->type == PI) {
fprintf(file, "<?%s %s?>\n", node->name, node->text);
} else if (node->type == DOCUMENT) {
--depth;
}
/* No work if this is a Document.
*/
/* Recurse on child */
print(node->child, file, depth + 1);
if(node->child && (node->type == ELEMENT)) {
int j = 0;
for(; j < depth; j++) {
fprintf(file, "%c", '\t');
}
fprintf(file, "</%s>\n", node->name);
}
/* Recurse on sibling */
print(node->sibling, file, depth);
fflush(file);
}
/* Use this to remove attribute from an element */
void remove_attribute(xml_element * element,
char * name) {
if( element && name ) {
xml_attribute * p, *q;
for( q = p = element->attributes;
p;
q = p, p = p->next) {
if(strcmp( p->name, name) == 0) {
if(q == p) {
element->attributes = p->next;
} else {
q->next = p->next;
}
}
}
}
}
/* Use this to add attribute from an element */
void add_attribute(xml_element * element,
xml_attribute * attrib) {
if( element && attrib ) {
if(element->attributes) {
xml_attribute * p = element->attributes;
while(p) {
if(strcmp(p->name, attrib->name) == 0) {
if(p->value) free(p->value);
p->value = attrib->value;
return;
}
p = p->next;
}
attrib->next = element->attributes;
}
element->attributes = attrib;
}
}
/* Process text replaces &<ref>; tokens with appropriate characters */
char * process_text(char * value) {
char * buf = NULL;
if(value) {
int len = strlen(value);
char * p = value;
char * q = NULL;
while( *p ) {
char c = *p++;
/* Relaxed estimate for length */
if(c == '"' ||
c == '<' ||
c =='>' ||
c == '\'' ||
c == '&')
len += 5;
}
p = value;
buf = malloc(len+1);
q = buf;
while( *p ) {
char c = *p++;
if(c == '"' || c == '\'') {
*q++ = '&';
*q++ = 'q';
*q++ = 'u';
*q++ = 'o';
*q++ = 't';
*q++ = ';';
} else if(c == '`') {
*q++ = '&';
*q++ = 'a';
*q++ = 'p';
*q++ = 'o';
*q++ = 's';
*q++ = ';';
} else if( c == '&') {
if(*p && *(p+1) && *(p+2)) {
if(!memcmp(p, "lt;", 3) || !memcmp(p, "gt;", 3)) {
*q++ = '&';
*q++ = *p;
*q++ = *(p+1);
*q++ = *(p+2);
p = p + 3;
continue;
} else if (*(p+3) && !memcmp(p, "amp;", 4)) {
*q++ = '&';
*q++ = 'a';
*q++ = 'm';
*q++ = 'p';
*q++ = ';';
p = p + 4;
continue;
} else if (*(p + 3) && *(p + 4)) {
if(!memcmp(p, "quot;", 5) || !memcmp(p, "apos;", 5)) {
*q++ = '&';
*q++ = *p;
*q++ = *(p+1);
*q++ = *(p+2);
*q++ = *(p+3);
*q++ = *(p+4);
p = p + 5;
continue;
}
}
}
*q++ = '&';
*q++ = 'a';
*q++ = 'm';
*q++ = 'p';
*q++ = ';';
} else if (c == '<') {
*q++ = '&';
*q++ = 'l';
*q++ = 't';
*q++ = ';';
} else if (c == '>') {
*q++ = '&';
*q++ = 'g';
*q++ = 't';
*q++ = ';';
} else if (c == '\r') {
if(*p && *p == '\n') {
*q++ = '\n';
++p;
continue;
}
} else {
*q++ = c;
}