Unicode

Unicode — Unicode and UTF-8 utility functions.

Types and Values

typedef raptor_unichar

Description

Functions to support converting to and from Unicode written in UTF-8 which is the native internal string format of all the redland libraries. Includes checking for Unicode names using either the XML 1.0 or XML 1.1 rules.

Functions

raptor_unicode_utf8_string_put_char ()

int
raptor_unicode_utf8_string_put_char (raptor_unichar c,
                                     unsigned char *output,
                                     size_t length);

Encode a Unicode character to a UTF-8 string

If output is NULL, then will calculate the length rather than perform the encoding. This can be used by the called to allocate space and then re-call this function with the new buffer.

Parameters

c

Unicode character

 

output

UTF-8 string buffer or NULL

 

length

length of output buffer

 

Returns

number of bytes encoded to output buffer or <0 on failure


raptor_unicode_utf8_string_get_char ()

int
raptor_unicode_utf8_string_get_char (const char *input,
                                     size_t length,
                                     raptor_unichar *output);

Decode a UTF-8 encoded string to get a Unicode character.

If output is NULL, then will calculate the number of bytes that will be used from the input buffer and not perform the conversion.

Parameters

input

UTF-8 string buffer

 

length

buffer size

 

output

Pointer to the Unicode character or NULL

 

Returns

bytes used from input buffer or <0 on failure: -1 input buffer too short or length error, -2 overlong UTF-8 sequence, -3 illegal code positions, -4 code out of range U+0000 to U+10FFFF. In cases -2, -3 and -4 the coded character is stored in the output.


raptor_unicode_is_xml11_namestartchar ()

int
raptor_unicode_is_xml11_namestartchar (raptor_unichar c);

Check if Unicode character is legal to start an XML 1.1 Name

See Namespaces in XML 1.1 REC 2004-02-04 NameStartChar updating

Extensible Markup Language (XML) 1.1 REC 2004-02-04 sec 2.3, [4a]

excluding the ':'

Parameters

c

Unicode character to check

 

Returns

non-0 if legal


raptor_unicode_is_xml10_namestartchar ()

int
raptor_unicode_is_xml10_namestartchar (raptor_unichar c);

Check if Unicode character is legal to start an XML 1.0 Name

See Namespaces in XML REC 1999-01-14 updating

Extensible Markup Language (XML) 1.0 (Third Edition) REC 2004-02-04

excluding the ':'

Parameters

c

Unicode character to check

 

Returns

non-0 if legal


raptor_unicode_is_xml11_namechar ()

int
raptor_unicode_is_xml11_namechar (raptor_unichar c);

Check if a Unicode codepoint is a legal to continue an XML 1.1 Name

See Namespaces in XML 1.1 REC 2004-02-04 updating

Extensible Markup Language (XML) 1.0 (Third Edition) REC 2004-02-04 sec 2.3, [4a]

excluding the ':'

Parameters

c

Unicode character

 

Returns

non-0 if legal


raptor_unicode_is_xml10_namechar ()

int
raptor_unicode_is_xml10_namechar (raptor_unichar c);

Check if a Unicode codepoint is a legal to continue an XML 1.0 Name

See Namespaces in XML REC 1999-01-14 NCNameChar updating

Extensible Markup Language (XML) 1.0 (Third Edition) REC 2004-02-04

excluding the ':'

Parameters

c

Unicode character

 

Returns

non-0 if legal


raptor_unicode_check_utf8_string ()

int
raptor_unicode_check_utf8_string (const char *string,
                                  size_t length);

Check a string is valid Unicode UTF-8.

Parameters

string

UTF-8 string

 

length

length of string

 

Returns

Non 0 if the string is UTF-8


raptor_unicode_utf8_strlen ()

int
raptor_unicode_utf8_strlen (const char *string,
                            size_t length);

Calculate the number of Unicode characters in the given UTF-8 encoded buffer

Parameters

string

buffer

 

length

buffer length

 

Returns

number of characters or <0 if sequence is invalid


raptor_unicode_utf8_substr ()

size_t
raptor_unicode_utf8_substr (unsigned char *dest,
                            size_t *dest_length_p,
                            const unsigned char *src,
                            size_t src_length,
                            int startingLoc,
                            int length);

Get a unicode (UTF-8) substring of an existing UTF-8 string

If dest is NULL, returns the number of bytes needed to write and does no work.

Parameters

dest

destination string buffer to write to (or NULL)

 

dest_length_p

location to store actual destination length (or NULL)

 

src

source string

 

src_length

source length in bytes

 

startingLoc

starting location offset 0 for first Unicode character

 

length

number of Unicode characters to copy at offset startingLoc (or < 0)

 

Returns

number of bytes used in destination string or 0 on failure

Types and Values

raptor_unichar

typedef unsigned long raptor_unichar;

raptor Unicode codepoint



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