github.com/afumu/libc@v0.0.6/musl/src/ctype/iswprint.c (about)

     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  
    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  
    21  int __iswprint_l(wint_t c, locale_t l)
    22  {
    23  	return iswprint(c);
    24  }
    25  
    26  weak_alias(__iswprint_l, iswprint_l);