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alphaindex.h
26.13
KB
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2021-10-12 12:29
appendable.h
8.25
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2021-10-12 12:29
basictz.h
8.73
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2021-10-12 12:29
brkiter.h
27.31
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2021-10-12 12:29
bytestream.h
9.16
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2021-10-12 12:29
bytestrie.h
19.19
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2021-10-12 12:29
bytestriebuilder.h
7.06
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calendar.h
105.26
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2021-10-12 12:29
caniter.h
7.24
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2021-10-12 12:29
chariter.h
23.71
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2021-10-12 12:29
choicfmt.h
23.74
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2021-10-12 12:29
coleitr.h
13.57
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2021-10-12 12:29
coll.h
55.46
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2021-10-12 12:29
compactdecimalformat.h
16.56
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2021-10-12 12:29
curramt.h
3.57
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currpinf.h
6.97
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2021-10-12 12:29
currunit.h
2.81
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2021-10-12 12:29
datefmt.h
40.07
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2021-10-12 12:29
dbbi.h
1020
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2021-10-12 12:29
dcfmtsym.h
16.46
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2021-10-12 12:29
decimfmt.h
90.45
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2021-10-12 12:29
docmain.h
6.28
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2021-10-12 12:29
dtfmtsym.h
37.05
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2021-10-12 12:29
dtintrv.h
3.65
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2021-10-12 12:29
dtitvfmt.h
42.76
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2021-10-12 12:29
dtitvinf.h
18.34
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2021-10-12 12:29
dtptngen.h
23.18
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2021-10-12 12:29
dtrule.h
8.51
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2021-10-12 12:29
enumset.h
1.94
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2021-10-12 12:29
errorcode.h
4.67
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2021-10-12 12:29
fieldpos.h
8.51
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2021-10-12 12:29
filteredbrk.h
4.22
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2021-10-12 12:29
fmtable.h
24.29
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2021-10-12 12:29
format.h
12.33
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2021-10-12 12:29
fpositer.h
2.87
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2021-10-12 12:29
gender.h
3.07
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2021-10-12 12:29
gregocal.h
31.46
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2021-10-12 12:29
icudataver.h
938
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2021-10-12 12:29
icuplug.h
11.58
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2021-10-12 12:29
idna.h
12.55
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2021-10-12 12:29
listformatter.h
4.73
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2021-10-12 12:29
localpointer.h
18.17
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2021-10-12 12:29
locdspnm.h
6.92
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2021-10-12 12:29
locid.h
31.3
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2021-10-12 12:29
measfmt.h
10.43
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2021-10-12 12:29
measunit.h
37.64
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measure.h
4.15
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messagepattern.h
33.53
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msgfmt.h
43.05
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2021-10-12 12:29
normalizer2.h
28.17
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2021-10-12 12:29
normlzr.h
30.65
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2021-10-12 12:29
numfmt.h
45.85
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2021-10-12 12:29
numsys.h
6.62
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2021-10-12 12:29
parseerr.h
2.97
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2021-10-12 12:29
parsepos.h
5.34
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2021-10-12 12:29
platform.h
26.96
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2021-10-12 12:29
plurfmt.h
25.55
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2021-10-12 12:29
plurrule.h
17.16
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2021-10-12 12:29
ptypes.h
3.36
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2021-10-12 12:29
putil.h
6.23
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2021-10-12 12:29
rbbi.h
29.2
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rbnf.h
46.66
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rbtz.h
15.36
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regex.h
84.75
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region.h
9
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reldatefmt.h
13.73
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rep.h
9.38
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2021-10-12 12:29
resbund.h
17.89
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2021-10-12 12:29
schriter.h
6.15
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2021-10-12 12:29
scientificnumberformatter.h
6.48
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2021-10-12 12:29
search.h
22.1
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2021-10-12 12:29
selfmt.h
14.13
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2021-10-12 12:29
simpleformatter.h
11.14
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2021-10-12 12:29
simpletz.h
45.13
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2021-10-12 12:29
smpdtfmt.h
69.24
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2021-10-12 12:29
sortkey.h
11.01
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2021-10-12 12:29
std_string.h
905
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2021-10-12 12:29
strenum.h
9.92
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2021-10-12 12:29
stringpiece.h
6.38
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2021-10-12 12:29
stringtriebuilder.h
14.56
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2021-10-12 12:29
stsearch.h
21.18
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2021-10-12 12:29
symtable.h
4.1
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2021-10-12 12:29
tblcoll.h
36.24
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2021-10-12 12:29
timezone.h
40.71
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2021-10-12 12:29
tmunit.h
2.94
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2021-10-12 12:29
tmutamt.h
4.69
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2021-10-12 12:29
tmutfmt.h
7.61
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2021-10-12 12:29
translit.h
54.41
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2021-10-12 12:29
tzfmt.h
42.69
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2021-10-12 12:29
tznames.h
16.25
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2021-10-12 12:29
tzrule.h
35.21
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2021-10-12 12:29
tztrans.h
5.96
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2021-10-12 12:29
ubidi.h
88.57
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2021-10-12 12:29
ubrk.h
20.05
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2021-10-12 12:29
ucal.h
54.18
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2021-10-12 12:29
ucasemap.h
16.45
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2021-10-12 12:29
ucat.h
5.25
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2021-10-12 12:29
uchar.h
122.74
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2021-10-12 12:29
ucharstrie.h
20.8
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2021-10-12 12:29
ucharstriebuilder.h
7.01
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2021-10-12 12:29
uchriter.h
12.82
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2021-10-12 12:29
uclean.h
11.03
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2021-10-12 12:29
ucnv.h
82.81
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ucnv_cb.h
6.48
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2021-10-12 12:29
ucnv_err.h
20.87
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2021-10-12 12:29
ucnvsel.h
6.03
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2021-10-12 12:29
ucol.h
60.51
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2021-10-12 12:29
ucoleitr.h
9.34
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2021-10-12 12:29
uconfig.h
11.76
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2021-10-12 12:29
ucsdet.h
14.35
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2021-10-12 12:29
ucurr.h
14.92
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2021-10-12 12:29
udat.h
59.91
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2021-10-12 12:29
udata.h
15.28
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udateintervalformat.h
6.68
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2021-10-12 12:29
udatpg.h
23.5
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udisplaycontext.h
4.87
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uenum.h
7.76
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ufieldpositer.h
4.24
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2021-10-12 12:29
uformattable.h
10.65
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2021-10-12 12:29
ugender.h
1.89
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2021-10-12 12:29
uidna.h
33.26
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2021-10-12 12:29
uiter.h
22.67
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2021-10-12 12:29
uldnames.h
10.34
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2021-10-12 12:29
ulistformatter.h
4.43
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2021-10-12 12:29
uloc.h
49.78
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2021-10-12 12:29
ulocdata.h
10.57
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2021-10-12 12:29
umachine.h
10.94
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umisc.h
1.23
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umsg.h
24.12
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unifilt.h
3.52
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unifunct.h
3.87
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unimatch.h
5.93
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unirepl.h
3.21
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uniset.h
63.86
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unistr.h
170.03
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unorm.h
20.18
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unorm2.h
25.11
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unum.h
49.13
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unumsys.h
7.03
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uobject.h
10.61
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upluralrules.h
4.47
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uregex.h
71.95
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uregion.h
9.58
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ureldatefmt.h
11.85
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urename.h
123.32
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urep.h
5.27
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ures.h
36.25
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uscript.h
25.24
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usearch.h
37.71
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uset.h
39.67
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2021-10-12 12:29
usetiter.h
9.38
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ushape.h
17.89
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uspoof.h
45.43
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usprep.h
8.02
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ustdio.h
38.43
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ustream.h
1.8
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ustring.h
72.69
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2021-10-12 12:29
ustringtrie.h
3.04
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2021-10-12 12:29
utext.h
57.97
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2021-10-12 12:29
utf.h
7.64
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utf16.h
18.63
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utf32.h
653
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utf8.h
27.62
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utf_old.h
42.5
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2021-10-12 12:29
utmscale.h
13.37
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2021-10-12 12:29
utrace.h
13.09
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2021-10-12 12:29
utrans.h
25.42
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utypes.h
31.05
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2021-10-12 12:29
uvernum.h
5.62
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2021-10-12 12:29
uversion.h
6.29
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2021-10-12 12:29
vtzone.h
20.06
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-rw-r--r--
2021-10-12 12:29
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/* ******************************************************************************* * * 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