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r2578: Pick up optimisation from Samba4 - thanks tridge !

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- I recently found out that charaters below 0x3F are guaranteed not to
  occur as secondary bytes in any multi-byte character set. This
  allows for a very simple optimisation in strchr_m() and
  strrchr_m(). It might be a good idea to pick this up for Samba3.
Jeremy.
This commit is contained in:
Jeremy Allison 2004-09-24 01:32:19 +00:00 committed by Gerald (Jerry) Carter
parent fc51c97ea8
commit 0465e2d23d
1 changed files with 12 additions and 0 deletions
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12
source/lib/util_str.c
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@ -1208,6 +1208,12 @@ char *strchr_m(const char *src, char c)
smb_ucs2_t *p;
const char *s;
/* characters below 0x3F are guaranteed to not appear in
non-initial position in multi-byte charsets */
if ((c & 0xC0) == 0) {
return strchr(s, c);
}
/* this is quite a common operation, so we want it to be
fast. We optimise for the ascii case, knowing that all our
supported multi-byte character sets are ascii-compatible
@ -1237,6 +1243,12 @@ char *strchr_m(const char *src, char c)
char *strrchr_m(const char *s, char c)
{
/* characters below 0x3F are guaranteed to not appear in
non-initial position in multi-byte charsets */
if ((c & 0xC0) == 0) {
return strrchr(s, c);
}
/* this is quite a common operation, so we want it to be
fast. We optimise for the ascii case, knowing that all our
supported multi-byte character sets are ascii-compatible