mirror of git://git.musl-libc.org/musl
53 lines
987 B
C
53 lines
987 B
C
/*
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* This code was written by Rich Felker in 2010; no copyright is claimed.
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* This code is in the public domain. Attribution is appreciated but
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* unnecessary.
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*/
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#include <stdlib.h>
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#include <inttypes.h>
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#include <wchar.h>
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#include <errno.h>
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#include "internal.h"
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size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st)
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{
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size_t l, cnt=0, n2;
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char *s, buf[256];
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const wchar_t *ws = *wcs;
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if (!dst) s = buf, n = sizeof buf;
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else s = dst;
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while ( ws && n && ( (n2=wn)>=n || n2>32 ) ) {
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if (n2>=n) n2=n;
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wn -= n2;
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l = wcsrtombs(s, &ws, n2, 0);
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if (!(l+1)) {
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cnt = l;
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n = 0;
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break;
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}
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if (s != buf) {
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s += l;
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n -= l;
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}
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cnt += l;
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}
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if (ws) while (n && wn) {
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l = wcrtomb(s, *ws, 0);
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if ((l+1)<=1) {
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if (!l) ws = 0;
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else cnt = l;
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break;
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}
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ws++; wn--;
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/* safe - this loop runs fewer than sizeof(buf) times */
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s+=l; n-=l;
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cnt++;
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}
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if (dst) *wcs = ws;
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return cnt;
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}
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