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Date
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alphaindex.h
26.25
KB
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2019-10-10 05:03
appendable.h
8.38
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2019-10-10 05:03
basictz.h
8.85
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2019-10-10 05:03
brkiter.h
27.62
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2019-10-10 05:03
bytestream.h
9.28
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2019-10-10 05:03
bytestrie.h
19.27
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2019-10-10 05:03
bytestriebuilder.h
7.11
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2019-10-10 05:03
calendar.h
105.38
KB
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2019-10-10 05:03
caniter.h
7.36
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2019-10-10 05:03
chariter.h
23.83
KB
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2019-10-10 05:03
choicfmt.h
23.86
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2019-10-10 05:03
coleitr.h
13.69
KB
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2019-10-10 05:03
coll.h
55.59
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2019-10-10 05:03
compactdecimalformat.h
16.59
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2019-10-10 05:03
curramt.h
3.69
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2019-10-10 05:03
currpinf.h
7.09
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2019-10-10 05:03
currunit.h
2.93
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2019-10-10 05:03
datefmt.h
40.19
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2019-10-10 05:03
dbbi.h
1.12
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2019-10-10 05:03
dcfmtsym.h
16.58
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2019-10-10 05:03
decimfmt.h
90.64
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2019-10-10 05:03
docmain.h
6.42
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2019-10-10 05:03
dtfmtsym.h
37.61
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2019-10-10 05:03
dtintrv.h
3.77
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2019-10-10 05:03
dtitvfmt.h
42.88
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2019-10-10 05:03
dtitvinf.h
18.63
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2019-10-10 05:03
dtptngen.h
23.54
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2019-10-10 05:03
dtrule.h
8.63
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2019-10-10 05:03
enumset.h
2.07
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2019-10-10 05:03
errorcode.h
4.79
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2019-10-10 05:03
fieldpos.h
8.64
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2019-10-10 05:03
filteredbrk.h
4.29
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2019-10-10 05:03
fmtable.h
24.4
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2019-10-10 05:03
format.h
12.45
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2019-10-10 05:03
fpositer.h
2.99
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2019-10-10 05:03
gender.h
3.19
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2019-10-10 05:03
gregocal.h
31.58
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2019-10-10 05:03
icudataver.h
1.04
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2019-10-10 05:03
icuplug.h
11.87
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2019-10-10 05:03
idna.h
12.65
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2019-10-10 05:03
listformatter.h
4.85
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2019-10-10 05:03
localpointer.h
18.19
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2019-10-10 05:03
locdspnm.h
7.04
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2019-10-10 05:03
locid.h
31.42
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2019-10-10 05:03
measfmt.h
11.31
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2019-10-10 05:03
measunit.h
38.43
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2019-10-10 05:03
measure.h
4.27
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2019-10-10 05:03
messagepattern.h
33.66
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2019-10-10 05:03
msgfmt.h
43.17
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2019-10-10 05:03
normalizer2.h
28.29
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2019-10-10 05:03
normlzr.h
30.72
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2019-10-10 05:03
numfmt.h
45.98
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2019-10-10 05:03
numsys.h
6.74
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2019-10-10 05:03
parseerr.h
3.09
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2019-10-10 05:03
parsepos.h
5.46
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2019-10-10 05:03
platform.h
27.25
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2019-10-10 05:03
plurfmt.h
25.67
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2019-10-10 05:03
plurrule.h
17.28
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2019-10-10 05:03
ptypes.h
3.48
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2019-10-10 05:03
putil.h
6.35
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2019-10-10 05:03
rbbi.h
27.78
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2019-10-10 05:03
rbnf.h
47.01
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2019-10-10 05:03
rbtz.h
15.48
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2019-10-10 05:03
regex.h
84.88
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2019-10-10 05:03
region.h
9.13
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2019-10-10 05:03
reldatefmt.h
14.34
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2019-10-10 05:03
rep.h
9.5
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2019-10-10 05:03
resbund.h
18.01
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2019-10-10 05:03
schriter.h
6.27
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2019-10-10 05:03
scientificnumberformatter.h
6.6
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2019-10-10 05:03
search.h
22.22
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2019-10-10 05:03
selfmt.h
14.25
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2019-10-10 05:03
simpleformatter.h
11.26
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2019-10-10 05:03
simpletz.h
45.25
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2019-10-10 05:03
smpdtfmt.h
69.73
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2019-10-10 05:03
sortkey.h
11.13
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2019-10-10 05:03
std_string.h
1
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2019-10-10 05:03
strenum.h
10.04
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2019-10-10 05:03
stringpiece.h
6.49
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2019-10-10 05:03
stringtriebuilder.h
15.17
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2019-10-10 05:03
stsearch.h
21.3
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2019-10-10 05:03
symtable.h
4.22
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2019-10-10 05:03
tblcoll.h
36.37
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2019-10-10 05:03
timezone.h
40.83
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2019-10-10 05:03
tmunit.h
3.3
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2019-10-10 05:03
tmutamt.h
4.81
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2019-10-10 05:03
tmutfmt.h
7.8
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2019-10-10 05:03
translit.h
54.53
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2019-10-10 05:03
tzfmt.h
42.81
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2019-10-10 05:03
tznames.h
16.86
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2019-10-10 05:03
tzrule.h
35.33
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2019-10-10 05:03
tztrans.h
6.08
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2019-10-10 05:03
ubidi.h
89.14
KB
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2019-10-10 05:03
ubiditransform.h
12.76
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2019-10-10 05:03
ubrk.h
20.74
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2019-10-10 05:03
ucal.h
54.55
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2019-10-10 05:03
ucasemap.h
16.57
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2019-10-10 05:03
ucat.h
5.37
KB
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2019-10-10 05:03
uchar.h
130.91
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2019-10-10 05:03
ucharstrie.h
20.92
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2019-10-10 05:03
ucharstriebuilder.h
7.13
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2019-10-10 05:03
uchriter.h
12.95
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2019-10-10 05:03
uclean.h
11.15
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2019-10-10 05:03
ucnv.h
83.07
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2019-10-10 05:03
ucnv_cb.h
6.6
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2019-10-10 05:03
ucnv_err.h
21
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2019-10-10 05:03
ucnvsel.h
6.15
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2019-10-10 05:03
ucol.h
61.36
KB
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2019-10-10 05:03
ucoleitr.h
9.46
KB
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2019-10-10 05:03
uconfig.h
11.88
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2019-10-10 05:03
ucsdet.h
14.47
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2019-10-10 05:03
ucurr.h
15.16
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2019-10-10 05:03
udat.h
60.25
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2019-10-10 05:03
udata.h
15.55
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2019-10-10 05:03
udateintervalformat.h
6.8
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2019-10-10 05:03
udatpg.h
24.12
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2019-10-10 05:03
udisplaycontext.h
6
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2019-10-10 05:03
uenum.h
7.88
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2019-10-10 05:03
ufieldpositer.h
4.37
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2019-10-10 05:03
uformattable.h
10.94
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2019-10-10 05:03
ugender.h
2.01
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2019-10-10 05:03
uidna.h
33.38
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2019-10-10 05:03
uiter.h
22.79
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2019-10-10 05:03
uldnames.h
10.46
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2019-10-10 05:03
ulistformatter.h
4.55
KB
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2019-10-10 05:03
uloc.h
50.07
KB
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2019-10-10 05:03
ulocdata.h
11.27
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2019-10-10 05:03
umachine.h
11.56
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2019-10-10 05:03
umisc.h
1.35
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2019-10-10 05:03
umsg.h
24.24
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2019-10-10 05:03
unifilt.h
3.64
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2019-10-10 05:03
unifunct.h
3.99
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2019-10-10 05:03
unimatch.h
6.05
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2019-10-10 05:03
unirepl.h
3.33
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2019-10-10 05:03
uniset.h
63.99
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2019-10-10 05:03
unistr.h
169.99
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2019-10-10 05:03
unorm.h
20.43
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2019-10-10 05:03
unorm2.h
25.23
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2019-10-10 05:03
unum.h
50.01
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2019-10-10 05:03
unumsys.h
7.15
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2019-10-10 05:03
uobject.h
10.73
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2019-10-10 05:03
upluralrules.h
4.74
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2019-10-10 05:03
uregex.h
72.07
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2019-10-10 05:03
uregion.h
9.84
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2019-10-10 05:03
ureldatefmt.h
12.31
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2019-10-10 05:03
urename.h
124.22
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2019-10-10 05:03
urep.h
5.39
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2019-10-10 05:03
ures.h
36.53
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2019-10-10 05:03
uscript.h
25.66
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2019-10-10 05:03
usearch.h
38.15
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2019-10-10 05:03
uset.h
39.92
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2019-10-10 05:03
usetiter.h
9.5
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2019-10-10 05:03
ushape.h
18.01
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2019-10-10 05:03
uspoof.h
65.05
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2019-10-10 05:03
usprep.h
8.14
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2019-10-10 05:03
ustdio.h
38.55
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2019-10-10 05:03
ustream.h
1.92
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2019-10-10 05:03
ustring.h
72.81
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2019-10-10 05:03
ustringtrie.h
3.16
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2019-10-10 05:03
utext.h
58.09
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2019-10-10 05:03
utf.h
7.76
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2019-10-10 05:03
utf16.h
18.75
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2019-10-10 05:03
utf32.h
777
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2019-10-10 05:03
utf8.h
27.74
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2019-10-10 05:03
utf_old.h
42.62
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2019-10-10 05:03
utmscale.h
13.49
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2019-10-10 05:03
utrace.h
13.9
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2019-10-10 05:03
utrans.h
25.54
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2019-10-10 05:03
utypes.h
29.92
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2019-10-10 05:03
uvernum.h
5.71
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2019-10-10 05:03
uversion.h
6.42
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2019-10-10 05:03
vtzone.h
20.18
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2019-10-10 05:03
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// Copyright (C) 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: US-ASCII * 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) { \ (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)); \ } \ } \ } /** * 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 that itself * will be returned as the code point. * 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) { \ (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)); \ } \ } \ } \ } /* 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) { \ (c)=(s)[(i)++]; \ if(U16_IS_LEAD(c)) { \ (c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)++]); \ } \ } /** * 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 that itself * will be returned as the code point. * * @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) { \ (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); \ } \ } \ } /** * 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) { \ 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); \ } \ } /** * 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) { \ 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; \ } \ } /** * 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) { \ if(U16_IS_LEAD((s)[(i)++])) { \ ++(i); \ } \ } /** * 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) { \ if(U16_IS_LEAD((s)[(i)++]) && (i)!=(length) && U16_IS_TRAIL((s)[i])) { \ ++(i); \ } \ } /** * 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) { \ int32_t __N=(n); \ while(__N>0) { \ U16_FWD_1_UNSAFE(s, i); \ --__N; \ } \ } /** * 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) { \ int32_t __N=(n); \ while(__N>0 && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \ U16_FWD_1(s, i, length); \ --__N; \ } \ } /** * 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) { \ if(U16_IS_TRAIL((s)[i])) { \ --(i); \ } \ } /** * 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) { \ if(U16_IS_TRAIL((s)[i]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \ --(i); \ } \ } /* 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) { \ (c)=(s)[--(i)]; \ if(U16_IS_TRAIL(c)) { \ (c)=U16_GET_SUPPLEMENTARY((s)[--(i)], (c)); \ } \ } /** * 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 that itself * will be returned as the code point. * * @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) { \ (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)); \ } \ } \ } /** * 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) { \ if(U16_IS_TRAIL((s)[--(i)])) { \ --(i); \ } \ } /** * 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) { \ if(U16_IS_TRAIL((s)[--(i)]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \ --(i); \ } \ } /** * 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) { \ int32_t __N=(n); \ while(__N>0) { \ U16_BACK_1_UNSAFE(s, i); \ --__N; \ } \ } /** * 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) { \ int32_t __N=(n); \ while(__N>0 && (i)>(start)) { \ U16_BACK_1(s, start, i); \ --__N; \ } \ } /** * 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) { \ if(U16_IS_LEAD((s)[(i)-1])) { \ ++(i); \ } \ } /** * 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) { \ if((start)<(i) && ((i)<(length) || (length)<0) && U16_IS_LEAD((s)[(i)-1]) && U16_IS_TRAIL((s)[i])) { \ ++(i); \ } \ } #endif