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alphaindex.h
26.48
KB
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2026-06-02 15:52
appendable.h
8.49
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2026-06-02 15:52
basictz.h
9.15
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2026-06-02 15:52
brkiter.h
27.8
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2026-06-02 15:52
bytestream.h
9.6
KB
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2026-06-02 15:52
bytestrie.h
20.77
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2026-06-02 15:52
bytestriebuilder.h
7.08
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2026-06-02 15:52
calendar.h
105.74
KB
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2026-06-02 15:52
caniter.h
7.43
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2026-06-02 15:52
casemap.h
25.33
KB
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2026-06-02 15:52
char16ptr.h
7.22
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2026-06-02 15:52
chariter.h
24.05
KB
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2026-06-02 15:52
choicfmt.h
23.91
KB
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2026-06-02 15:52
coleitr.h
13.76
KB
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2026-06-02 15:52
coll.h
56.23
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2026-06-02 15:52
compactdecimalformat.h
6.88
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2026-06-02 15:52
curramt.h
3.76
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2026-06-02 15:52
currpinf.h
7.3
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2026-06-02 15:52
currunit.h
4.05
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2026-06-02 15:52
datefmt.h
40.67
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2026-06-02 15:52
dbbi.h
1.19
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2026-06-02 15:52
dcfmtsym.h
20.13
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2026-06-02 15:52
decimfmt.h
87.38
KB
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2026-06-02 15:52
docmain.h
6.97
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2026-06-02 15:52
dtfmtsym.h
37.7
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2026-06-02 15:52
dtintrv.h
3.84
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2026-06-02 15:52
dtitvfmt.h
46.63
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2026-06-02 15:52
dtitvinf.h
18.51
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2026-06-02 15:52
dtptngen.h
25.08
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2026-06-02 15:52
dtrule.h
8.68
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2026-06-02 15:52
edits.h
20.74
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2026-06-02 15:52
enumset.h
2.08
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2026-06-02 15:52
errorcode.h
4.84
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2026-06-02 15:52
fieldpos.h
8.69
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2026-06-02 15:52
filteredbrk.h
5.37
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2026-06-02 15:52
fmtable.h
24.42
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2026-06-02 15:52
format.h
12.5
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2026-06-02 15:52
formattedvalue.h
10.27
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2026-06-02 15:52
fpositer.h
3.04
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2026-06-02 15:52
gender.h
3.33
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2026-06-02 15:52
gregocal.h
31.71
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2026-06-02 15:52
icudataver.h
1.03
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2026-06-02 15:52
icuplug.h
11.88
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2026-06-02 15:52
idna.h
12.7
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2026-06-02 15:52
listformatter.h
9.47
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2026-06-02 15:52
localebuilder.h
11.27
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2026-06-02 15:52
localematcher.h
22.5
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2026-06-02 15:52
localpointer.h
19.69
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2026-06-02 15:52
locdspnm.h
7.12
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2026-06-02 15:52
locid.h
47.4
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2026-06-02 15:52
measfmt.h
11.33
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2026-06-02 15:52
measunit.h
93.31
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2026-06-02 15:52
measure.h
4.32
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2026-06-02 15:52
messagepattern.h
33.71
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2026-06-02 15:52
msgfmt.h
44.11
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2026-06-02 15:52
normalizer2.h
34.03
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2026-06-02 15:52
normlzr.h
30.94
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2026-06-02 15:52
nounit.h
2.69
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2026-06-02 15:52
numberformatter.h
86.31
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2026-06-02 15:52
numberrangeformatter.h
30.14
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2026-06-02 15:52
numfmt.h
49.81
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2026-06-02 15:52
numsys.h
7.19
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2026-06-02 15:52
parseerr.h
3.08
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2026-06-02 15:52
parsepos.h
5.56
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2026-06-02 15:52
platform.h
28.08
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2026-06-02 15:52
plurfmt.h
25.2
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2026-06-02 15:52
plurrule.h
18.39
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2026-06-02 15:52
ptypes.h
3.49
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2026-06-02 15:52
putil.h
6.33
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2026-06-02 15:52
rbbi.h
26.58
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2026-06-02 15:52
rbnf.h
48.73
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2026-06-02 15:52
rbtz.h
15.6
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2026-06-02 15:52
regex.h
84.36
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2026-06-02 15:52
region.h
9.18
KB
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2026-06-02 15:52
reldatefmt.h
22.62
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2026-06-02 15:52
rep.h
9.37
KB
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2026-06-02 15:52
resbund.h
18.07
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2026-06-02 15:52
schriter.h
6.32
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2026-06-02 15:52
scientificnumberformatter.h
6.4
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2026-06-02 15:52
search.h
22.22
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2026-06-02 15:52
selfmt.h
14.3
KB
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2026-06-02 15:52
simpleformatter.h
12.59
KB
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2026-06-02 15:52
simpletz.h
45.44
KB
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2026-06-02 15:52
smpdtfmt.h
70.97
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2026-06-02 15:52
sortkey.h
11.18
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2026-06-02 15:52
std_string.h
1.05
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2026-06-02 15:52
strenum.h
9.92
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2026-06-02 15:52
stringoptions.h
5.79
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2026-06-02 15:52
stringpiece.h
7.38
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2026-06-02 15:52
stringtriebuilder.h
15.33
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2026-06-02 15:52
stsearch.h
21.3
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2026-06-02 15:52
symtable.h
4.27
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2026-06-02 15:52
tblcoll.h
36.61
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2026-06-02 15:52
timezone.h
41.02
KB
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2026-06-02 15:52
tmunit.h
3.38
KB
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2026-06-02 15:52
tmutamt.h
4.9
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2026-06-02 15:52
tmutfmt.h
7.85
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2026-06-02 15:52
translit.h
65.82
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2026-06-02 15:52
tzfmt.h
42.89
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2026-06-02 15:52
tznames.h
16.85
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2026-06-02 15:52
tzrule.h
35.37
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2026-06-02 15:52
tztrans.h
6.12
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2026-06-02 15:52
ubidi.h
89.56
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2026-06-02 15:52
ubiditransform.h
12.65
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2026-06-02 15:52
ubrk.h
23.97
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2026-06-02 15:52
ucal.h
56.9
KB
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2026-06-02 15:52
ucasemap.h
15.18
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2026-06-02 15:52
ucat.h
5.36
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2026-06-02 15:52
uchar.h
140.56
KB
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2026-06-02 15:52
ucharstrie.h
22.58
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2026-06-02 15:52
ucharstriebuilder.h
7.21
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2026-06-02 15:52
uchriter.h
13.2
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2026-06-02 15:52
uclean.h
11.21
KB
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2026-06-02 15:52
ucnv.h
83.09
KB
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2026-06-02 15:52
ucnv_cb.h
6.59
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2026-06-02 15:52
ucnv_err.h
20.99
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2026-06-02 15:52
ucnvsel.h
6.14
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2026-06-02 15:52
ucol.h
61.46
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2026-06-02 15:52
ucoleitr.h
9.46
KB
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2026-06-02 15:52
uconfig.h
12.07
KB
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2026-06-02 15:52
ucpmap.h
5.53
KB
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2026-06-02 15:52
ucptrie.h
22.46
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2026-06-02 15:52
ucsdet.h
14.67
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2026-06-02 15:52
ucurr.h
16.12
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2026-06-02 15:52
udat.h
60.88
KB
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2026-06-02 15:52
udata.h
15.56
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2026-06-02 15:52
udateintervalformat.h
10.03
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2026-06-02 15:52
udatpg.h
26.01
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2026-06-02 15:52
udisplaycontext.h
5.89
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2026-06-02 15:52
uenum.h
7.78
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2026-06-02 15:52
ufieldpositer.h
4.36
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2026-06-02 15:52
uformattable.h
10.94
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2026-06-02 15:52
uformattedvalue.h
12.14
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2026-06-02 15:52
ugender.h
2
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2026-06-02 15:52
uidna.h
33.37
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2026-06-02 15:52
uiter.h
22.77
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2026-06-02 15:52
uldnames.h
10.45
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2026-06-02 15:52
ulistformatter.h
8.83
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2026-06-02 15:52
uloc.h
52.54
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2026-06-02 15:52
ulocdata.h
11.26
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2026-06-02 15:52
umachine.h
14.53
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2026-06-02 15:52
umisc.h
1.33
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2026-06-02 15:52
umsg.h
24.23
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2026-06-02 15:52
umutablecptrie.h
8.24
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2026-06-02 15:52
unifilt.h
3.96
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2026-06-02 15:52
unifunct.h
4.04
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2026-06-02 15:52
unimatch.h
6.1
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2026-06-02 15:52
unirepl.h
3.38
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2026-06-02 15:52
uniset.h
64.9
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2026-06-02 15:52
unistr.h
170.43
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2026-06-02 15:52
unorm.h
20.52
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2026-06-02 15:52
unorm2.h
24.66
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2026-06-02 15:52
unum.h
53.62
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2026-06-02 15:52
unumberformatter.h
25.36
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2026-06-02 15:52
unumsys.h
7.21
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2026-06-02 15:52
uobject.h
10.68
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2026-06-02 15:52
upluralrules.h
7.88
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2026-06-02 15:52
uregex.h
72.05
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2026-06-02 15:52
uregion.h
9.84
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2026-06-02 15:52
ureldatefmt.h
17.26
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2026-06-02 15:52
urename.h
130.97
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2026-06-02 15:52
urep.h
5.38
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2026-06-02 15:52
ures.h
36.54
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2026-06-02 15:52
uscript.h
26.87
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2026-06-02 15:52
usearch.h
38.12
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2026-06-02 15:52
uset.h
40
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2026-06-02 15:52
usetiter.h
9.55
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2026-06-02 15:52
ushape.h
18
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2026-06-02 15:52
uspoof.h
65.9
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usprep.h
8.14
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2026-06-02 15:52
ustdio.h
38.54
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ustream.h
1.89
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2026-06-02 15:52
ustring.h
72.47
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2026-06-02 15:52
ustringtrie.h
3.15
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2026-06-02 15:52
utext.h
58.13
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2026-06-02 15:52
utf.h
7.86
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2026-06-02 15:52
utf16.h
23.32
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utf32.h
763
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utf8.h
30.96
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2026-06-02 15:52
utf_old.h
45.83
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2026-06-02 15:52
utmscale.h
13.78
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2026-06-02 15:52
utrace.h
15.73
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2026-06-02 15:52
utrans.h
25.52
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2026-06-02 15:52
utypes.h
30.74
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2026-06-02 15:52
uvernum.h
6.67
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2026-06-02 15:52
uversion.h
6
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2026-06-02 15:52
vtzone.h
20.3
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2026-06-02 15:52
Save
Rename
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * * Copyright (C) 1999-2012, International Business Machines * Corporation and others. All Rights Reserved. * ******************************************************************************* * file name: utf16.h * encoding: UTF-8 * tab size: 8 (not used) * indentation:4 * * created on: 1999sep09 * created by: Markus W. Scherer */ /** * \file * \brief C API: 16-bit Unicode handling macros * * This file defines macros to deal with 16-bit Unicode (UTF-16) code units and strings. * * For more information see utf.h and the ICU User Guide Strings chapter * (http://userguide.icu-project.org/strings). * * <em>Usage:</em> * ICU coding guidelines for if() statements should be followed when using these macros. * Compound statements (curly braces {}) must be used for if-else-while... * bodies and all macro statements should be terminated with semicolon. */ #ifndef __UTF16_H__ #define __UTF16_H__ #include "unicode/umachine.h" #ifndef __UTF_H__ # include "unicode/utf.h" #endif /* single-code point definitions -------------------------------------------- */ /** * Does this code unit alone encode a code point (BMP, not a surrogate)? * @param c 16-bit code unit * @return TRUE or FALSE * @stable ICU 2.4 */ #define U16_IS_SINGLE(c) !U_IS_SURROGATE(c) /** * Is this code unit a lead surrogate (U+d800..U+dbff)? * @param c 16-bit code unit * @return TRUE or FALSE * @stable ICU 2.4 */ #define U16_IS_LEAD(c) (((c)&0xfffffc00)==0xd800) /** * Is this code unit a trail surrogate (U+dc00..U+dfff)? * @param c 16-bit code unit * @return TRUE or FALSE * @stable ICU 2.4 */ #define U16_IS_TRAIL(c) (((c)&0xfffffc00)==0xdc00) /** * Is this code unit a surrogate (U+d800..U+dfff)? * @param c 16-bit code unit * @return TRUE or FALSE * @stable ICU 2.4 */ #define U16_IS_SURROGATE(c) U_IS_SURROGATE(c) /** * Assuming c is a surrogate code point (U16_IS_SURROGATE(c)), * is it a lead surrogate? * @param c 16-bit code unit * @return TRUE or FALSE * @stable ICU 2.4 */ #define U16_IS_SURROGATE_LEAD(c) (((c)&0x400)==0) /** * Assuming c is a surrogate code point (U16_IS_SURROGATE(c)), * is it a trail surrogate? * @param c 16-bit code unit * @return TRUE or FALSE * @stable ICU 4.2 */ #define U16_IS_SURROGATE_TRAIL(c) (((c)&0x400)!=0) /** * Helper constant for U16_GET_SUPPLEMENTARY. * @internal */ #define U16_SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000) /** * Get a supplementary code point value (U+10000..U+10ffff) * from its lead and trail surrogates. * The result is undefined if the input values are not * lead and trail surrogates. * * @param lead lead surrogate (U+d800..U+dbff) * @param trail trail surrogate (U+dc00..U+dfff) * @return supplementary code point (U+10000..U+10ffff) * @stable ICU 2.4 */ #define U16_GET_SUPPLEMENTARY(lead, trail) \ (((UChar32)(lead)<<10UL)+(UChar32)(trail)-U16_SURROGATE_OFFSET) /** * Get the lead surrogate (0xd800..0xdbff) for a * supplementary code point (0x10000..0x10ffff). * @param supplementary 32-bit code point (U+10000..U+10ffff) * @return lead surrogate (U+d800..U+dbff) for supplementary * @stable ICU 2.4 */ #define U16_LEAD(supplementary) (UChar)(((supplementary)>>10)+0xd7c0) /** * Get the trail surrogate (0xdc00..0xdfff) for a * supplementary code point (0x10000..0x10ffff). * @param supplementary 32-bit code point (U+10000..U+10ffff) * @return trail surrogate (U+dc00..U+dfff) for supplementary * @stable ICU 2.4 */ #define U16_TRAIL(supplementary) (UChar)(((supplementary)&0x3ff)|0xdc00) /** * How many 16-bit code units are used to encode this Unicode code point? (1 or 2) * The result is not defined if c is not a Unicode code point (U+0000..U+10ffff). * @param c 32-bit code point * @return 1 or 2 * @stable ICU 2.4 */ #define U16_LENGTH(c) ((uint32_t)(c)<=0xffff ? 1 : 2) /** * The maximum number of 16-bit code units per Unicode code point (U+0000..U+10ffff). * @return 2 * @stable ICU 2.4 */ #define U16_MAX_LENGTH 2 /** * Get a code point from a string at a random-access offset, * without changing the offset. * "Unsafe" macro, assumes well-formed UTF-16. * * The offset may point to either the lead or trail surrogate unit * for a supplementary code point, in which case the macro will read * the adjacent matching surrogate as well. * The result is undefined if the offset points to a single, unpaired surrogate. * Iteration through a string is more efficient with U16_NEXT_UNSAFE or U16_NEXT. * * @param s const UChar * string * @param i string offset * @param c output UChar32 variable * @see U16_GET * @stable ICU 2.4 */ #define U16_GET_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[i]; \ if(U16_IS_SURROGATE(c)) { \ if(U16_IS_SURROGATE_LEAD(c)) { \ (c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)+1]); \ } else { \ (c)=U16_GET_SUPPLEMENTARY((s)[(i)-1], (c)); \ } \ } \ } UPRV_BLOCK_MACRO_END /** * Get a code point from a string at a random-access offset, * without changing the offset. * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The offset may point to either the lead or trail surrogate unit * for a supplementary code point, in which case the macro will read * the adjacent matching surrogate as well. * * The length can be negative for a NUL-terminated string. * * If the offset points to a single, unpaired surrogate, then * c is set to that unpaired surrogate. * Iteration through a string is more efficient with U16_NEXT_UNSAFE or U16_NEXT. * * @param s const UChar * string * @param start starting string offset (usually 0) * @param i string offset, must be start<=i<length * @param length string length * @param c output UChar32 variable * @see U16_GET_UNSAFE * @stable ICU 2.4 */ #define U16_GET(s, start, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[i]; \ if(U16_IS_SURROGATE(c)) { \ uint16_t __c2; \ if(U16_IS_SURROGATE_LEAD(c)) { \ if((i)+1!=(length) && U16_IS_TRAIL(__c2=(s)[(i)+1])) { \ (c)=U16_GET_SUPPLEMENTARY((c), __c2); \ } \ } else { \ if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \ (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \ } \ } \ } \ } UPRV_BLOCK_MACRO_END /** * Get a code point from a string at a random-access offset, * without changing the offset. * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The offset may point to either the lead or trail surrogate unit * for a supplementary code point, in which case the macro will read * the adjacent matching surrogate as well. * * The length can be negative for a NUL-terminated string. * * If the offset points to a single, unpaired surrogate, then * c is set to U+FFFD. * Iteration through a string is more efficient with U16_NEXT_UNSAFE or U16_NEXT_OR_FFFD. * * @param s const UChar * string * @param start starting string offset (usually 0) * @param i string offset, must be start<=i<length * @param length string length * @param c output UChar32 variable * @see U16_GET_UNSAFE * @stable ICU 60 */ #define U16_GET_OR_FFFD(s, start, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[i]; \ if(U16_IS_SURROGATE(c)) { \ uint16_t __c2; \ if(U16_IS_SURROGATE_LEAD(c)) { \ if((i)+1!=(length) && U16_IS_TRAIL(__c2=(s)[(i)+1])) { \ (c)=U16_GET_SUPPLEMENTARY((c), __c2); \ } else { \ (c)=0xfffd; \ } \ } else { \ if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \ (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \ } else { \ (c)=0xfffd; \ } \ } \ } \ } UPRV_BLOCK_MACRO_END /* definitions with forward iteration --------------------------------------- */ /** * Get a code point from a string at a code point boundary offset, * and advance the offset to the next code point boundary. * (Post-incrementing forward iteration.) * "Unsafe" macro, assumes well-formed UTF-16. * * The offset may point to the lead surrogate unit * for a supplementary code point, in which case the macro will read * the following trail surrogate as well. * If the offset points to a trail surrogate, then that itself * will be returned as the code point. * The result is undefined if the offset points to a single, unpaired lead surrogate. * * @param s const UChar * string * @param i string offset * @param c output UChar32 variable * @see U16_NEXT * @stable ICU 2.4 */ #define U16_NEXT_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[(i)++]; \ if(U16_IS_LEAD(c)) { \ (c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)++]); \ } \ } UPRV_BLOCK_MACRO_END /** * Get a code point from a string at a code point boundary offset, * and advance the offset to the next code point boundary. * (Post-incrementing forward iteration.) * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The length can be negative for a NUL-terminated string. * * The offset may point to the lead surrogate unit * for a supplementary code point, in which case the macro will read * the following trail surrogate as well. * If the offset points to a trail surrogate or * to a single, unpaired lead surrogate, then c is set to that unpaired surrogate. * * @param s const UChar * string * @param i string offset, must be i<length * @param length string length * @param c output UChar32 variable * @see U16_NEXT_UNSAFE * @stable ICU 2.4 */ #define U16_NEXT(s, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[(i)++]; \ if(U16_IS_LEAD(c)) { \ uint16_t __c2; \ if((i)!=(length) && U16_IS_TRAIL(__c2=(s)[(i)])) { \ ++(i); \ (c)=U16_GET_SUPPLEMENTARY((c), __c2); \ } \ } \ } UPRV_BLOCK_MACRO_END /** * Get a code point from a string at a code point boundary offset, * and advance the offset to the next code point boundary. * (Post-incrementing forward iteration.) * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The length can be negative for a NUL-terminated string. * * The offset may point to the lead surrogate unit * for a supplementary code point, in which case the macro will read * the following trail surrogate as well. * If the offset points to a trail surrogate or * to a single, unpaired lead surrogate, then c is set to U+FFFD. * * @param s const UChar * string * @param i string offset, must be i<length * @param length string length * @param c output UChar32 variable * @see U16_NEXT_UNSAFE * @stable ICU 60 */ #define U16_NEXT_OR_FFFD(s, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[(i)++]; \ if(U16_IS_SURROGATE(c)) { \ uint16_t __c2; \ if(U16_IS_SURROGATE_LEAD(c) && (i)!=(length) && U16_IS_TRAIL(__c2=(s)[(i)])) { \ ++(i); \ (c)=U16_GET_SUPPLEMENTARY((c), __c2); \ } else { \ (c)=0xfffd; \ } \ } \ } UPRV_BLOCK_MACRO_END /** * Append a code point to a string, overwriting 1 or 2 code units. * The offset points to the current end of the string contents * and is advanced (post-increment). * "Unsafe" macro, assumes a valid code point and sufficient space in the string. * Otherwise, the result is undefined. * * @param s const UChar * string buffer * @param i string offset * @param c code point to append * @see U16_APPEND * @stable ICU 2.4 */ #define U16_APPEND_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \ if((uint32_t)(c)<=0xffff) { \ (s)[(i)++]=(uint16_t)(c); \ } else { \ (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \ (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \ } \ } UPRV_BLOCK_MACRO_END /** * Append a code point to a string, overwriting 1 or 2 code units. * The offset points to the current end of the string contents * and is advanced (post-increment). * "Safe" macro, checks for a valid code point. * If a surrogate pair is written, checks for sufficient space in the string. * If the code point is not valid or a trail surrogate does not fit, * then isError is set to TRUE. * * @param s const UChar * string buffer * @param i string offset, must be i<capacity * @param capacity size of the string buffer * @param c code point to append * @param isError output UBool set to TRUE if an error occurs, otherwise not modified * @see U16_APPEND_UNSAFE * @stable ICU 2.4 */ #define U16_APPEND(s, i, capacity, c, isError) UPRV_BLOCK_MACRO_BEGIN { \ if((uint32_t)(c)<=0xffff) { \ (s)[(i)++]=(uint16_t)(c); \ } else if((uint32_t)(c)<=0x10ffff && (i)+1<(capacity)) { \ (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \ (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \ } else /* c>0x10ffff or not enough space */ { \ (isError)=TRUE; \ } \ } UPRV_BLOCK_MACRO_END /** * Advance the string offset from one code point boundary to the next. * (Post-incrementing iteration.) * "Unsafe" macro, assumes well-formed UTF-16. * * @param s const UChar * string * @param i string offset * @see U16_FWD_1 * @stable ICU 2.4 */ #define U16_FWD_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \ if(U16_IS_LEAD((s)[(i)++])) { \ ++(i); \ } \ } UPRV_BLOCK_MACRO_END /** * Advance the string offset from one code point boundary to the next. * (Post-incrementing iteration.) * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The length can be negative for a NUL-terminated string. * * @param s const UChar * string * @param i string offset, must be i<length * @param length string length * @see U16_FWD_1_UNSAFE * @stable ICU 2.4 */ #define U16_FWD_1(s, i, length) UPRV_BLOCK_MACRO_BEGIN { \ if(U16_IS_LEAD((s)[(i)++]) && (i)!=(length) && U16_IS_TRAIL((s)[i])) { \ ++(i); \ } \ } UPRV_BLOCK_MACRO_END /** * Advance the string offset from one code point boundary to the n-th next one, * i.e., move forward by n code points. * (Post-incrementing iteration.) * "Unsafe" macro, assumes well-formed UTF-16. * * @param s const UChar * string * @param i string offset * @param n number of code points to skip * @see U16_FWD_N * @stable ICU 2.4 */ #define U16_FWD_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \ int32_t __N=(n); \ while(__N>0) { \ U16_FWD_1_UNSAFE(s, i); \ --__N; \ } \ } UPRV_BLOCK_MACRO_END /** * Advance the string offset from one code point boundary to the n-th next one, * i.e., move forward by n code points. * (Post-incrementing iteration.) * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The length can be negative for a NUL-terminated string. * * @param s const UChar * string * @param i int32_t string offset, must be i<length * @param length int32_t string length * @param n number of code points to skip * @see U16_FWD_N_UNSAFE * @stable ICU 2.4 */ #define U16_FWD_N(s, i, length, n) UPRV_BLOCK_MACRO_BEGIN { \ int32_t __N=(n); \ while(__N>0 && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \ U16_FWD_1(s, i, length); \ --__N; \ } \ } UPRV_BLOCK_MACRO_END /** * Adjust a random-access offset to a code point boundary * at the start of a code point. * If the offset points to the trail surrogate of a surrogate pair, * then the offset is decremented. * Otherwise, it is not modified. * "Unsafe" macro, assumes well-formed UTF-16. * * @param s const UChar * string * @param i string offset * @see U16_SET_CP_START * @stable ICU 2.4 */ #define U16_SET_CP_START_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \ if(U16_IS_TRAIL((s)[i])) { \ --(i); \ } \ } UPRV_BLOCK_MACRO_END /** * Adjust a random-access offset to a code point boundary * at the start of a code point. * If the offset points to the trail surrogate of a surrogate pair, * then the offset is decremented. * Otherwise, it is not modified. * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * @param s const UChar * string * @param start starting string offset (usually 0) * @param i string offset, must be start<=i * @see U16_SET_CP_START_UNSAFE * @stable ICU 2.4 */ #define U16_SET_CP_START(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \ if(U16_IS_TRAIL((s)[i]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \ --(i); \ } \ } UPRV_BLOCK_MACRO_END /* definitions with backward iteration -------------------------------------- */ /** * Move the string offset from one code point boundary to the previous one * and get the code point between them. * (Pre-decrementing backward iteration.) * "Unsafe" macro, assumes well-formed UTF-16. * * The input offset may be the same as the string length. * If the offset is behind a trail surrogate unit * for a supplementary code point, then the macro will read * the preceding lead surrogate as well. * If the offset is behind a lead surrogate, then that itself * will be returned as the code point. * The result is undefined if the offset is behind a single, unpaired trail surrogate. * * @param s const UChar * string * @param i string offset * @param c output UChar32 variable * @see U16_PREV * @stable ICU 2.4 */ #define U16_PREV_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[--(i)]; \ if(U16_IS_TRAIL(c)) { \ (c)=U16_GET_SUPPLEMENTARY((s)[--(i)], (c)); \ } \ } UPRV_BLOCK_MACRO_END /** * Move the string offset from one code point boundary to the previous one * and get the code point between them. * (Pre-decrementing backward iteration.) * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The input offset may be the same as the string length. * If the offset is behind a trail surrogate unit * for a supplementary code point, then the macro will read * the preceding lead surrogate as well. * If the offset is behind a lead surrogate or behind a single, unpaired * trail surrogate, then c is set to that unpaired surrogate. * * @param s const UChar * string * @param start starting string offset (usually 0) * @param i string offset, must be start<i * @param c output UChar32 variable * @see U16_PREV_UNSAFE * @stable ICU 2.4 */ #define U16_PREV(s, start, i, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[--(i)]; \ if(U16_IS_TRAIL(c)) { \ uint16_t __c2; \ if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \ --(i); \ (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \ } \ } \ } UPRV_BLOCK_MACRO_END /** * Move the string offset from one code point boundary to the previous one * and get the code point between them. * (Pre-decrementing backward iteration.) * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The input offset may be the same as the string length. * If the offset is behind a trail surrogate unit * for a supplementary code point, then the macro will read * the preceding lead surrogate as well. * If the offset is behind a lead surrogate or behind a single, unpaired * trail surrogate, then c is set to U+FFFD. * * @param s const UChar * string * @param start starting string offset (usually 0) * @param i string offset, must be start<i * @param c output UChar32 variable * @see U16_PREV_UNSAFE * @stable ICU 60 */ #define U16_PREV_OR_FFFD(s, start, i, c) UPRV_BLOCK_MACRO_BEGIN { \ (c)=(s)[--(i)]; \ if(U16_IS_SURROGATE(c)) { \ uint16_t __c2; \ if(U16_IS_SURROGATE_TRAIL(c) && (i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \ --(i); \ (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \ } else { \ (c)=0xfffd; \ } \ } \ } UPRV_BLOCK_MACRO_END /** * Move the string offset from one code point boundary to the previous one. * (Pre-decrementing backward iteration.) * The input offset may be the same as the string length. * "Unsafe" macro, assumes well-formed UTF-16. * * @param s const UChar * string * @param i string offset * @see U16_BACK_1 * @stable ICU 2.4 */ #define U16_BACK_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \ if(U16_IS_TRAIL((s)[--(i)])) { \ --(i); \ } \ } UPRV_BLOCK_MACRO_END /** * Move the string offset from one code point boundary to the previous one. * (Pre-decrementing backward iteration.) * The input offset may be the same as the string length. * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * @param s const UChar * string * @param start starting string offset (usually 0) * @param i string offset, must be start<i * @see U16_BACK_1_UNSAFE * @stable ICU 2.4 */ #define U16_BACK_1(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \ if(U16_IS_TRAIL((s)[--(i)]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \ --(i); \ } \ } UPRV_BLOCK_MACRO_END /** * Move the string offset from one code point boundary to the n-th one before it, * i.e., move backward by n code points. * (Pre-decrementing backward iteration.) * The input offset may be the same as the string length. * "Unsafe" macro, assumes well-formed UTF-16. * * @param s const UChar * string * @param i string offset * @param n number of code points to skip * @see U16_BACK_N * @stable ICU 2.4 */ #define U16_BACK_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \ int32_t __N=(n); \ while(__N>0) { \ U16_BACK_1_UNSAFE(s, i); \ --__N; \ } \ } UPRV_BLOCK_MACRO_END /** * Move the string offset from one code point boundary to the n-th one before it, * i.e., move backward by n code points. * (Pre-decrementing backward iteration.) * The input offset may be the same as the string length. * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * @param s const UChar * string * @param start start of string * @param i string offset, must be start<i * @param n number of code points to skip * @see U16_BACK_N_UNSAFE * @stable ICU 2.4 */ #define U16_BACK_N(s, start, i, n) UPRV_BLOCK_MACRO_BEGIN { \ int32_t __N=(n); \ while(__N>0 && (i)>(start)) { \ U16_BACK_1(s, start, i); \ --__N; \ } \ } UPRV_BLOCK_MACRO_END /** * Adjust a random-access offset to a code point boundary after a code point. * If the offset is behind the lead surrogate of a surrogate pair, * then the offset is incremented. * Otherwise, it is not modified. * The input offset may be the same as the string length. * "Unsafe" macro, assumes well-formed UTF-16. * * @param s const UChar * string * @param i string offset * @see U16_SET_CP_LIMIT * @stable ICU 2.4 */ #define U16_SET_CP_LIMIT_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \ if(U16_IS_LEAD((s)[(i)-1])) { \ ++(i); \ } \ } UPRV_BLOCK_MACRO_END /** * Adjust a random-access offset to a code point boundary after a code point. * If the offset is behind the lead surrogate of a surrogate pair, * then the offset is incremented. * Otherwise, it is not modified. * The input offset may be the same as the string length. * "Safe" macro, handles unpaired surrogates and checks for string boundaries. * * The length can be negative for a NUL-terminated string. * * @param s const UChar * string * @param start int32_t starting string offset (usually 0) * @param i int32_t string offset, start<=i<=length * @param length int32_t string length * @see U16_SET_CP_LIMIT_UNSAFE * @stable ICU 2.4 */ #define U16_SET_CP_LIMIT(s, start, i, length) UPRV_BLOCK_MACRO_BEGIN { \ if((start)<(i) && ((i)<(length) || (length)<0) && U16_IS_LEAD((s)[(i)-1]) && U16_IS_TRAIL((s)[i])) { \ ++(i); \ } \ } UPRV_BLOCK_MACRO_END #endif