src/ctype/wcwidth.c

   1 #include <wchar.h>
   2
   3 static const unsigned char table[] = {
   4 #include "nonspacing.h"
   5 };
   6
   7 static const unsigned char wtable[] = {
   8 #include "wide.h"
   9 };
  10
  11 int wcwidth(wchar_t wc)
  12 {
  13         if (wc < 0xffU)
  14                 return (wc+1 & 0x7f) >= 0x21 ? 1 : wc ? -1 : 0;
  15         if ((wc & 0xfffeffffU) < 0xfffe) {
  16                 if ((table[table[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1)
  17                         return 0;
  18                 if ((wtable[wtable[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1)
  19                         return 2;
  20                 return 1;
  21         }
  22         if ((wc & 0xfffe) == 0xfffe)
  23                 return -1;
  24         if (wc-0x20000U < 0x20000)
  25                 return 2;
  26         if (wc == 0xe0001 || wc-0xe0020U < 0x5f || wc-0xe0100U < 0xef)
  27                 return 0;
  28         return 1;
  29 }