wcwidth.c raw

   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  }
  30