src/stdio/fgetws.c

   1 #include "stdio_impl.h"
   2 #include <wchar.h>
   3 #include <errno.h>
   4
   5 wint_t __fgetwc_unlocked(FILE *);
   6
   7 wchar_t *fgetws(wchar_t *restrict s, int n, FILE *restrict f)
   8 {
   9         wchar_t *p = s;
  10
  11         if (!n--) return s;
  12
  13         FLOCK(f);
  14
  15         /* Setup a dummy errno so we can detect EILSEQ. This is
  16          * the only way to catch encoding errors in the form of a
  17          * partial character just before EOF. */
  18         errno = EAGAIN;
  19         for (; n; n--) {
  20                 wint_t c = __fgetwc_unlocked(f);
  21                 if (c == WEOF) break;
  22                 *p++ = c;
  23                 if (c == '\n') break;
  24         }
  25         *p = 0;
  26         if (ferror(f) || errno==EILSEQ) p = s;
  27
  28         FUNLOCK(f);
  29
  30         return (p == s) ? NULL : s;
  31 }
  32
  33 weak_alias(fgetws, fgetws_unlocked);