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