src/ctype/iswprint.c

   1 #include <wctype.h>
   2 #include "libc.h"
   3
   4 /* Consider all legal codepoints as printable except for:
   5  * - C0 and C1 control characters
   6  * - U+2028 and U+2029 (line/para break)
   7  * - U+FFF9 through U+FFFB (interlinear annotation controls)
   8  * The following code is optimized heavily to make hot paths for the
   9  * expected printable characters. */
  10
  11 int iswprint(wint_t wc)
  12 {
  13         if (wc < 0xffU)
  14                 return (wc+1 & 0x7f) >= 0x21;
  15         if (wc < 0x2028U || wc-0x202aU < 0xd800-0x202a || wc-0xe000U < 0xfff9-0xe000)
  16                 return 1;
  17         if (wc-0xfffcU > 0x10ffff-0xfffc || (wc&0xfffe)==0xfffe)
  18                 return 0;
  19         return 1;
  20 }
  21
  22 int __iswprint_l(wint_t c, locale_t l)
  23 {
  24         return iswprint(c);
  25 }
  26
  27 weak_alias(__iswprint_l, iswprint_l);