summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorRich Felker <dalias@aerifal.cx>2012-04-23 16:10:36 -0400
committerRich Felker <dalias@aerifal.cx>2012-04-23 16:10:36 -0400
commit38b5d7d0526be24fba0f0789407727e4e7950e63 (patch)
tree3a37bf481d568fc073f03b6a2111db4474ffeae2
parent640fe75ce8e0ca3a1af98197a93e9aa4884f79bf (diff)
downloadmusl-38b5d7d0526be24fba0f0789407727e4e7950e63.tar.gz
optimize iswprint
-rw-r--r--src/ctype/iswprint.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/src/ctype/iswprint.c b/src/ctype/iswprint.c
index 7717671a..333f19c2 100644
--- a/src/ctype/iswprint.c
+++ b/src/ctype/iswprint.c
@@ -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;
}