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Diffstat (limited to 'src/multibyte/wcsnrtombs.c')
-rw-r--r--src/multibyte/wcsnrtombs.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/src/multibyte/wcsnrtombs.c b/src/multibyte/wcsnrtombs.c
new file mode 100644
index 00000000..666f6f3f
--- /dev/null
+++ b/src/multibyte/wcsnrtombs.c
@@ -0,0 +1,51 @@
+/*
+ * This code was written by Rich Felker in 2010; no copyright is claimed.
+ * This code is in the public domain. Attribution is appreciated but
+ * unnecessary.
+ */
+
+#include <stdlib.h>
+#include <inttypes.h>
+#include <wchar.h>
+#include <errno.h>
+
+#include "internal.h"
+
+size_t wcsnrtombs(char *dst, const wchar_t **wcs, size_t wn, size_t n, mbstate_t *st)
+{
+ size_t l, cnt=0, n2;
+ char *s, buf[256];
+ const wchar_t *ws = *wcs;
+
+ if (!dst) s = buf, n = sizeof buf;
+ else s = dst;
+
+ while ( n && ( (n2=wn)>=n || n2>32 ) ) {
+ if (n2>=n) n2=n;
+ wn -= n2;
+ l = wcsrtombs(s, &ws, n2, 0);
+ if (!(l+1)) {
+ cnt = l;
+ n = 0;
+ break;
+ }
+ if (s != buf) {
+ s += l;
+ n -= l;
+ }
+ cnt += l;
+ }
+ while (n && wn) {
+ l = wcrtomb(s, *ws, 0);
+ if (!(l+1)) {
+ cnt = l;
+ break;
+ }
+ ws++; wn--;
+ /* safe - this loop runs fewer than sizeof(buf) times */
+ s+=l; n-=l;
+ cnt++;
+ }
+ if (dst) *wcs = ws;
+ return cnt;
+}