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optimize iswprint

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This commit is contained in:
Rich Felker 2012-04-23 16:10:36 -04:00
parent 640fe75ce8
commit 38b5d7d052
1 changed files with 12 additions and 3 deletions
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15
src/ctype/iswprint.c
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@ -1,10 +1,19 @@
#include <wctype.h>
/* Consider all legal codepoints as printable except for:
* - C0 and C1 control characters
* - U+2028 and U+2029 (line/para break)
* - U+FFF9 through U+FFFB (interlinear annotation controls)
* The following code is optimized heavily to make hot paths for the
* expected printable characters. */
int iswprint(wint_t wc)
{
unsigned c = wc;
/* assume any non-control, non-illegal codepoint is printable */
if (c>0x10ffff || c-0xd800<0x800 || (c&0xfffe)==0xfffe || iswcntrl(c))
if (wc < 0xffU)
return (wc+1 & 0x7f) >= 0x21;
if (wc < 0x2028U || wc-0x202aU < 0xd800-0x202a || wc-0xe000U < 0xfff9-0xe000)
return 1;
if (wc-0xfffcU > 0x10ffff-0xfffc || (wc&0xfffe)==0xfffe)
return 0;
return 1;
}