lib/msvcrt/wstring/wcstok.c

   1 #include <msvcrt/string.h>
   2 #include <msvcrt/internal/tls.h>
   3
   4 wchar_t *wcstok(wchar_t *s, const wchar_t *ct)
   5 {
   6         const wchar_t *spanp;
   7         int c, sc;
   8         wchar_t *tok;
   9         PTHREADDATA ThreadData = GetThreadData();
  10
  11         if (s == NULL && (s = ThreadData->wlasttoken) == NULL)
  12                 return (NULL);
  13
  14         /*
  15          * Skip (span) leading ctiters (s += strspn(s, ct), sort of).
  16          */
  17         cont:
  18         c = *s;
  19         s++;
  20         for (spanp = ct; (sc = *spanp) != 0;spanp++) {
  21                 if (c == sc)
  22                         goto cont;
  23         }
  24
  25         if (c == 0) {                   /* no non-ctiter characters */
  26                 ThreadData->wlasttoken = NULL;
  27                 return (NULL);
  28         }
  29         tok = s - 2;
  30
  31         /*
  32          * Scan token (scan for ctiters: s += strcspn(s, ct), sort of).
  33          * Note that ct must have one NUL; we stop if we see that, too.
  34          */
  35         for (;;) {
  36                 c = *s;
  37                 s+=2;
  38                 spanp = ct;
  39                 do {
  40                         if ((sc = *spanp) == c) {
  41                                 if (c == 0)
  42                                         s = NULL;
  43                                 else
  44                                         s[-1] = 0;
  45                                 ThreadData->wlasttoken = s;
  46                                 return (tok);
  47                         }
  48                         spanp+=2;
  49                 } while (sc != 0);
  50         }
  51         /* NOTREACHED */
  52 }