section-unicode: Raptor RDF Syntax Library Manual

## section-unicode section-unicode |

## Functions

int | raptor_unicode_utf8_string_put_char ()
int | raptor_unicode_utf8_string_get_char ()
int | raptor_unicode_is_xml11_namestartchar ()
int | raptor_unicode_is_xml10_namestartchar ()
int | raptor_unicode_is_xml11_namechar ()
int | raptor_unicode_is_xml10_namechar ()
int | raptor_unicode_check_utf8_string ()
int | raptor_unicode_utf8_strlen ()
size_t | raptor_unicode_utf8_substr ()

## Types and Values

typedef | raptor_unichar

## Description

## 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