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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* turtle_common.c - Raptor Turtle common code
*
* Copyright (C) 2003-2007, David Beckett http://www.dajobe.org/
* Copyright (C) 2003-2005, University of Bristol, UK http://www.bristol.ac.uk/
*
* This package is Free Software and part of Redland http://librdf.org/
*
* It is licensed under the following three licenses as alternatives:
* 1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
* 2. GNU General Public License (GPL) V2 or any newer version
* 3. Apache License, V2.0 or any newer version
*
* You may not use this file except in compliance with at least one of
* the above three licenses.
*
* See LICENSE.html or LICENSE.txt at the top of this package for the
* complete terms and further detail along with the license texts for
* the licenses in COPYING.LIB, COPYING and LICENSE-2.0.txt respectively.
*
*
*/
#ifdef HAVE_CONFIG_H
#include <raptor_config.h>
#endif
#ifdef WIN32
#include <win32_raptor_config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
/* Raptor includes */
#include "raptor2.h"
#include "raptor_internal.h"
/**
* raptor_stringbuffer_append_turtle_string:
* @stringbuffer: String buffer to add to
* @text: turtle string to decode
* @len: length of string
* @delim: terminating delimiter for string - only ', " or > are allowed
* @error_handler: error handling function
* @error_data: error handler data
*
* Append to a stringbuffer a Turtle-escaped string.
*
* The passed in string is handled according to the Turtle string
* escape rules giving a UTF-8 encoded output of the Unicode codepoints.
*
* The Turtle escapes are \n \r \t \\
* \uXXXX \UXXXXXXXX where X is [A-F0-9]
*
* Return value: non-0 on failure
**/
int
raptor_stringbuffer_append_turtle_string(raptor_stringbuffer* stringbuffer,
const unsigned char *text,
size_t len, int delim,
raptor_simple_message_handler error_handler,
void *error_data)
{
size_t i;
const unsigned char *s;
unsigned char *d;
unsigned char *string = RAPTOR_MALLOC(unsigned char*, len + 1);
if(!string)
return -1;
for(s = text, d = string, i = 0; i < len; s++, i++) {
unsigned char c=*s;
if(c == '\\' ) {
s++; i++;
c=*s;
if(c == 'n')
*d++= '\n';
else if(c == 'r')
*d++= '\r';
else if(c == 't')
*d++= '\t';
else if(c == '\\' || c == delim)
*d++=c;
else if(c == 'u' || c == 'U') {
size_t ulen = (c == 'u') ? 4 : 8;
unsigned long unichar = 0;
int n;
int unichar_width;
s++; i++;
if(i+ulen > len) {
error_handler(error_data,
"Turtle string error - \\%c over end of line", c);
RAPTOR_FREE(char*, string);
return 1;
}
n = sscanf((const char*)s, ((ulen == 4) ? "%04lx" : "%08lx"), &unichar);
if(n != 1) {
error_handler(error_data,
"Turtle string error - illegal Uncode escape '%c%s...'",
c, s);
RAPTOR_FREE(char*, string);
return 1;
}
s+= ulen-1;
i+= ulen-1;
if(unichar > raptor_unicode_max_codepoint) {
error_handler(error_data,
"Turtle string error - illegal Unicode character with code point #x%lX (max #x%lX).",
unichar, raptor_unicode_max_codepoint);
RAPTOR_FREE(char*, string);
return 1;
}
unichar_width = raptor_unicode_utf8_string_put_char(unichar, d,
len-(d-string));
if(unichar_width < 0) {
error_handler(error_data,
"Turtle string error - illegal Unicode character with code point #x%lX.",
unichar);
RAPTOR_FREE(char*, string);
return 1;
}
d += (size_t)unichar_width;
} else {
/* don't handle \x where x isn't one of: \t \n \r \\ (delim) */
error_handler(error_data,
"Turtle string error - illegal escape \\%c (#x%02X) in \"%s\"",
c, c, text);
}
} else
*d++=c;
}
*d='\0';
/* calculate output string size */
len = d-string;
/* string gets owned by the stringbuffer after this */
return raptor_stringbuffer_append_counted_string(stringbuffer,
string, len, 0);
}
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