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/*
* uncdata -- remove CDATA sections from an XML file
*
* The input is scanned for occurrences of "<![CDATA[" and
* corresponding "]]>". Those strings are removed and all occurrences
* of "&", "<" and ">" in between them will be replaced by "&",
* "&;t;" and ">" resp.
*
* The input must be 1 byte per character. If it is not, convert it to
* UTF-8 first.
*
* Part of HTML-XML-utils, see:
* http://www.w3.org/Tools/HTML-XML-utils/
*
* Author: Bert Bos <bert@w3.org>
* Created: 20 Feb 2002
* Version: $Id: hxuncdata.c,v 1.2 2009/01/08 14:35:09 bbos Exp $
*/
#include <stdio.h>
#include <assert.h>
#include <string.h>
/* process -- process one file */
static void process(FILE *f)
{
int c;
enum {INITIAL, START, CDATA1, CDATA2, CDATA3, CDATA4, CDATA5,
CDATA6, CDATA7, CDATA98, CDATA99, CDATA, MARKUP, DECL1, DECL,
COMMENT1, COMMENT, COMMENT99, DQUOTE, SQUOTE} state = INITIAL;
/* No attempt at reporting errors for impossible XML,
and no support for internal DTD subsets
*/
while ((c = getc(f)) != EOF) {
switch (state) {
case INITIAL:
if (c == '<') state = START;
else putchar(c);
break;
case START: /* Seen "<" */
if (c == '!') state = DECL1;
else if (c == '>') {putchar('<'); putchar('>'); state = INITIAL;}
else {putchar('<'); putchar(c); state = MARKUP;}
break;
case MARKUP: /* Inside "<...>" */
if (c == '"') {putchar('"'); state = DQUOTE;}
else if (c == '\'') {putchar('\''); state = SQUOTE;}
else if (c == '>') {putchar('>'); state = INITIAL;}
else putchar(c);
break;
case DQUOTE: /* Inside double quotes */
if (c == '"') {putchar('"'); state = MARKUP;}
else putchar(c);
break;
case SQUOTE: /* Inside single quotes */
if (c == '\'') {putchar('\''); state = MARKUP;}
else putchar(c);
break;
case DECL1: /* Seen "<!" */
if (c == '-') {printf("<!-"); state = COMMENT1;}
else if (c == '[') state = CDATA1;
else {putchar('<'); putchar('!'); putchar(c); state = DECL;}
break;
case DECL: /* Inside "<!...>" */
if (c == '-') {putchar('-'); state = COMMENT1;}
else if (c == '>') {putchar('>'); state = INITIAL;}
else putchar(c);
break;
case COMMENT1: /* Seen "-" */
if (c == '-') {putchar('-'); state = COMMENT;}
else {putchar(c); state = DECL;}
break;
case COMMENT: /* Seen "--" */
if (c == '-') {putchar('-'); state = COMMENT99;}
else putchar(c);
break;
case COMMENT99: /* Seen "-" */
if (c == '-') {putchar('-'); state = DECL;}
else {putchar(c); state = COMMENT;}
break;
case CDATA1: /* Seen "<![" */
if (c == 'C') state = CDATA2;
else {printf("<![%c", c); state = INITIAL;}
break;
case CDATA2: /* Seen "<![C" */
if (c == 'D') state = CDATA3;
else {printf("<![C%c", c); state = INITIAL;}
break;
case CDATA3: /* Seen "<![CD" */
if (c == 'A') state = CDATA4;
else {printf("<![CD%c", c); state = INITIAL;}
break;
case CDATA4: /* Seen "<![CDA" */
if (c == 'T') state = CDATA5;
else {printf("<![CDA%c", c); state = INITIAL;}
break;
case CDATA5: /* Seen "<![CDAT" */
if (c == 'A') state = CDATA6;
else {printf("<![CDAT%c", c); state = INITIAL;}
break;
case CDATA6: /* Seen "<![CDATA" */
if (c == '[') state = CDATA;
else {printf("<![CDATA%c", c); state = INITIAL;}
break;
case CDATA: /* Inside "<![CDATA[...]]>" */
if (c == ']') state = CDATA98;
else if (c == '<') fputs("<", stdout);
else if (c == '>') fputs(">", stdout);
else if (c == '&') fputs("&", stdout);
else putchar(c);
break;
case CDATA98: /* Seen "]" */
if (c == ']') state = CDATA99;
else {putchar(']'); putchar(c); state = CDATA;}
break;
case CDATA99: /* Seen "]]" */
if (c == '>') state = INITIAL;
else {putchar(']'); putchar(']'); putchar(c); state = CDATA;}
break;
default:
assert(!"Cannot happen!");
}
}
}
int main(int argc, char *argv[])
{
int i, err = 0;
FILE *f;
if (argc == 1)
process(stdin);
else if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
printf("Usage: %s [XML-FILE]...\n", argv[0]);
else
for (i = 1; i < argc; i++) {
if (!(f = fopen(argv[i], "r"))) {perror(argv[i]); err++; continue;}
process(f);
if (fclose(f) != 0) {perror(argv[i]); err++; continue;}
}
return err;
}
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