Last change
on this file since 445 was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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Property svn:eol-style
set to
native
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Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
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File size:
1.1 KB
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1 | #include <wchar.h>
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2 |
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3 | size_t mbsnrtowcs(wchar_t *restrict wcs, const char **restrict src, size_t n, size_t wn, mbstate_t *restrict st)
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4 | {
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5 | size_t l, cnt=0, n2;
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6 | wchar_t *ws, wbuf[256];
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7 | const char *s = *src;
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8 | const char *tmp_s;
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9 |
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10 | if (!wcs) ws = wbuf, wn = sizeof wbuf / sizeof *wbuf;
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11 | else ws = wcs;
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12 |
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13 | /* making sure output buffer size is at most n/4 will ensure
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14 | * that mbsrtowcs never reads more than n input bytes. thus
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15 | * we can use mbsrtowcs as long as it's practical.. */
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16 |
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17 | while ( s && wn && ( (n2=n/4)>=wn || n2>32 ) ) {
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18 | if (n2>=wn) n2=wn;
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19 | tmp_s = s;
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20 | l = mbsrtowcs(ws, &s, n2, st);
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21 | if (!(l+1)) {
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22 | cnt = l;
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23 | wn = 0;
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24 | break;
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25 | }
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26 | if (ws != wbuf) {
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27 | ws += l;
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28 | wn -= l;
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29 | }
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30 | n = s ? n - (s - tmp_s) : 0;
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31 | cnt += l;
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32 | }
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33 | if (s) while (wn && n) {
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34 | l = mbrtowc(ws, s, n, st);
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35 | if (l+2<=2) {
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36 | if (!(l+1)) {
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37 | cnt = l;
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38 | break;
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39 | }
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40 | if (!l) {
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41 | s = 0;
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42 | break;
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43 | }
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44 | /* have to roll back partial character */
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45 | *(unsigned *)st = 0;
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46 | break;
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47 | }
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48 | s += l; n -= l;
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49 | /* safe - this loop runs fewer than sizeof(wbuf)/8 times */
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50 | ws++; wn--;
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51 | cnt++;
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52 | }
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53 | if (wcs) *src = s;
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54 | return cnt;
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55 | }
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