Subject: [PATCH 7/8] wildmatch: make a special case for "*/" with FNM_PATHNAME

From: Nguyễn Thái Ngọc Duy <[email-masked]>
Date: Sat, 22 Dec 2012 14:57:07 +0700

Normally we need recursion for "*". In this case we know that it
matches everything until "/" so we can skip the recursion.

glibc, '*/*/*' on linux-2.6.git file list 2000 times
before:
wildmatch 8s 74513us
fnmatch   1s 97042us or 13.59% faster
after:
wildmatch 3s 521862us
fnmatch   3s 488616us or 99.06% slower

Same test with compat/fnmatch:
wildmatch 8s 110763us
fnmatch   2s 980845us or 36.75% faster
wildmatch 3s 522156us
fnmatch   1s 544487us or 43.85% slower

Signed-off-by: Nguyễn Thái Ngọc Duy <[email-masked]>
---
 wildmatch.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/wildmatch.c b/wildmatch.c
index 4fe1d65..3794c4d 100644
--- a/wildmatch.c
+++ b/wildmatch.c
@@ -116,6 +116,18 @@ static int dowild(const uchar *p, const uchar *text, unsigned int flags)
 						return WM_NOMATCH;
 				}
 				return WM_MATCH;
+			} else if (*p == '/' && (flags & WM_PATHNAME) && !special) {
+				/*
+				 * an asterisk followed by a slash
+				 * with WM_PATHNAME matches the next
+				 * directory
+				 */
+				const char *slash = strchr((char*)text, '/');
+				if (!slash)
+					return WM_NOMATCH;
+				text = (const uchar*)slash;
+				/* the slash is consumed by the top-level for loop */
+				break;
 			}
 			while (1) {
 				if (t_ch == '\0')
-- 
1.8.0.rc2.23.g1fb49df