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<unicase.h>
This include file defines functions for case mapping for Unicode strings and case insensitive comparison of Unicode strings and C strings.
These string functions fix the problems that were mentioned in ‘char *’ strings, namely, they handle the Croatian LETTER DZ WITH CARON, the German LATIN SMALL LETTER SHARP S, the Greek sigma and the Lithuanian i correctly.
The following functions implement case mappings on Unicode characters — for those cases only where the result of the mapping is a again a single Unicode character.
These mappings are locale and context independent.
WARNING! These functions are not sufficient for languages such as German, Greek and Lithuanian. Better use the functions below that treat an entire string at once and are language aware. |
Returns the uppercase mapping of the Unicode character uc.
Returns the lowercase mapping of the Unicode character uc.
Returns the titlecase mapping of the Unicode character uc.
Case mapping should always be performed on entire strings, not on individual characters. The functions in this sections do so.
These functions allow to apply a normalization after the case mapping. The reason is that if you want to treat ‘ä’ and ‘Ä’ the same, you most often also want to treat the composed and decomposed forms of such a character, U+00C4 LATIN CAPITAL LETTER A WITH DIAERESIS and U+0041 LATIN CAPITAL LETTER A U+0308 COMBINING DIAERESIS the same. The nf argument designates the normalization.
These functions are locale dependent. The iso639_language argument
identifies the language (e.g. "tr"
for Turkish). NULL means to use
locale independent case mappings.
Returns the ISO 639 language code of the current locale.
Returns ""
if it is unknown, or in the "C" locale.
Returns the uppercase mapping of a string.
The nf argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization.
Returns the lowercase mapping of a string.
The nf argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization.
Returns the titlecase mapping of a string.
The nf argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization.
The following functions implement comparison that ignores differences in case and normalization.
Returns the case folded string.
Comparing u8_casefold (s1)
and u8_casefold (s2)
with the u8_cmp2
function is equivalent to comparing s1 and
s2 with u8_casecmp
.
The nf argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization.
Compares s1 and s2, ignoring differences in case and normalization.
The nf argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization.
If successful, sets *resultp
to -1 if s1 < s2,
0 if s1 = s2, 1 if s1 > s2, and returns 0.
Upon failure, returns -1 with errno
set.
The following functions additionally take into account the sorting rules of the current locale.
Converts the string s of length n to a string in locale encoding,
in such a way that comparing u8_casexfrm (s1)
and
u8_casexfrm (s2)
with memcmp2
is equivalent to comparing
s1 and s2 with u8_casecoll
.
nf must be either UNINORM_NFC
, UNINORM_NFKC
, or NULL for
no normalization.
Compares s1 and s2, ignoring differences in case and normalization, using the collation rules of the current locale.
The nf argument identifies the normalization form to apply after the
case-mapping. It must be either UNINORM_NFC
or UNINORM_NFKC
.
It can also be NULL, for no normalization.
If successful, sets *resultp
to -1 if s1 < s2,
0 if s1 = s2, 1 if s1 > s2, and returns 0.
Upon failure, returns -1 with errno
set.
The following functions determine whether a Unicode string is entirely in upper case. or entirely in lower case, or entirely in title case, or already case-folded.
Sets *resultp
to true if mapping NFD(s) to upper case is
a no-op, or to false otherwise, and returns 0. Upon failure, returns -1 with
errno
set.
Sets *resultp
to true if mapping NFD(s) to lower case is
a no-op, or to false otherwise, and returns 0. Upon failure, returns -1 with
errno
set.
Sets *resultp
to true if mapping NFD(s) to title case is
a no-op, or to false otherwise, and returns 0. Upon failure, returns -1 with
errno
set.
Sets *resultp
to true if applying case folding to NFD(S) is
a no-op, or to false otherwise, and returns 0. Upon failure, returns -1 with
errno
set.
The following functions determine whether case mappings have any effect on a Unicode string.
Sets *resultp
to true if case matters for s, that is, if
mapping NFD(s) to either upper case or lower case or title case is not
a no-op. Set *resultp
to false if NFD(s) maps to itself
under the upper case mapping, under the lower case mapping, and under the title
case mapping; in other words, when NFD(s) consists entirely of caseless
characters. Upon failure, returns -1 with errno
set.
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This document was generated by Bruno Haible on April, 27 2009 using texi2html 1.78a.