src/multibyte/wcsnrtombs.c

   1 #include <wchar.h>
   2 #include <limits.h>
   3 #include <string.h>
   4
   5 size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st)
   6 {
   7         const wchar_t *ws = *wcs;
   8         size_t cnt = 0;
   9         if (!dst) n=0;
  10         while (ws && wn) {
  11                 char tmp[MB_LEN_MAX];
  12                 size_t l = wcrtomb(n<MB_LEN_MAX ? tmp : dst, *ws, 0);
  13                 if (l==-1) {
  14                         cnt = -1;
  15                         break;
  16                 }
  17                 if (dst) {
  18                         if (n<MB_LEN_MAX) {
  19                                 if (l>n) break;
  20                                 memcpy(dst, tmp, l);
  21                         }
  22                         dst += l;
  23                         n -= l;
  24                 }
  25                 if (!*ws) {
  26                         ws = 0;
  27                         break;
  28                 }
  29                 ws++;
  30                 wn--;
  31                 cnt += l;
  32         }
  33         if (dst) *wcs = ws;
  34         return cnt;
  35 }