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Reimplement more efficiently, using a single forward scan (like strrchr(3))

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instead of scanning forwards to find the end of the string then scanning
backwards to find the character.
This commit is contained in:
Tim J. Robbins 2002-10-23 10:52:04 +00:00
parent ec23fdffc7
commit 1eb0f442c7
1 changed files with 12 additions and 22 deletions
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34
lib/libc/string/wcsrchr.c
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@ -1,5 +1,5 @@
/*-
* Copyright (c)1999 Citrus Project,
* Copyright (c) 2002 Tim J. Robbins
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -22,36 +22,26 @@
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* citrus Id: wcsrchr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
*/
#include <sys/cdefs.h>
#if 0
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: wcsrchr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $");
#endif /* LIBC_SCCS and not lint */
#endif
__FBSDID("$FreeBSD$");
#include <wchar.h>
wchar_t *
wcsrchr(s, c)
const wchar_t *s;
wchar_t c;
wcsrchr(const wchar_t *s, wchar_t c)
{
const wchar_t *p;
const wchar_t *last;
p = s;
while (*p)
p++;
while (s <= p) {
if (*p == c) {
/* LINTED interface specification */
return (wchar_t *)p;
}
p--;
last = NULL;
for (;;) {
if (*s == c)
last = s;
if (*s == L'\0')
break;
s++;
}
return NULL;
return ((wchar_t *)last);
}