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From b905f2002daaacc62cc5c083ebc6f7ba787a793e Mon Sep 17 00:00:00 2001
From: Christian Wiese <chris@opensde.org>
Date: Mon, 22 Oct 2012 17:58:00 +0200
Subject: [PATCH] improve glob speed

ChangeLog:

2011-05-07  Paul Smith  <psmith@gnu.org>

       * read.c (parse_file_seq): Ensure existence checks use glob().

2011-05-01  Paul Smith  <psmith@gnu.org>

       * read.c (parse_file_seq): Don't try to invoke glob() unless there
       are potential wildcard characters in the filename.  Performance
       enhancement suggested by Michael Meeks <michael.meeks@novell.com>

tests/Changelog:

2011-05-07  Paul Smith  <psmith@gnu.org>

       * scripts/functions/wildcard: Verify wildcard used to test for
       file existence/non-existence.
---
 read.c                           |   58 ++++++++++++++++++++++---------------
 tests/scripts/functions/wildcard |   12 ++++++++
 2 files changed, 46 insertions(+), 24 deletions(-)

diff --git a/read.c b/read.c
index 9dfd4ea..8587e85 100644
--- a/read.c
+++ b/read.c
@@ -2904,6 +2904,7 @@ parse_file_seq (char **stringp, unsigned int size, int stopchar,
       const char *name;
       const char **nlist = 0;
       char *tildep = 0;
+      int globme = 1;
 #ifndef NO_ARCHIVES
       char *arname = 0;
       char *memname = 0;
@@ -3112,32 +3113,40 @@ parse_file_seq (char **stringp, unsigned int size, int stopchar,
 	}
 #endif /* !NO_ARCHIVES */
 
-      switch (glob (name, GLOB_NOSORT|GLOB_ALTDIRFUNC, NULL, &gl))
-	{
-	case GLOB_NOSPACE:
-	  fatal (NILF, _("virtual memory exhausted"));
+      /* glob() is expensive: don't call it unless we need to.  */
+      if (!(flags & PARSEFS_EXISTS) && strpbrk (name, "?*[") == NULL)
+        {
+          globme = 0;
+          i = 1;
+          nlist = &name;
+        }
+      else
+        switch (glob (name, GLOB_NOSORT|GLOB_ALTDIRFUNC, NULL, &gl))
+          {
+          case GLOB_NOSPACE:
+            fatal (NILF, _("virtual memory exhausted"));
 
-	case 0:
-          /* Success.  */
-          i = gl.gl_pathc;
-          nlist = (const char **)gl.gl_pathv;
-          break;
+          case 0:
+            /* Success.  */
+            i = gl.gl_pathc;
+            nlist = (const char **)gl.gl_pathv;
+            break;
 
-        case GLOB_NOMATCH:
-          /* If we want only existing items, skip this one.  */
-          if (flags & PARSEFS_EXISTS)
-            {
-              i = 0;
-              break;
-            }
-          /* FALLTHROUGH */
+          case GLOB_NOMATCH:
+            /* If we want only existing items, skip this one.  */
+            if (flags & PARSEFS_EXISTS)
+              {
+                i = 0;
+                break;
+              }
+            /* FALLTHROUGH */
 
-	default:
-          /* By default keep this name.  */
-          i = 1;
-          nlist = &name;
-          break;
-	}
+          default:
+            /* By default keep this name.  */
+            i = 1;
+            nlist = &name;
+            break;
+          }
 
       /* For each matched element, add it to the list.  */
       while (i-- > 0)
@@ -3177,7 +3186,8 @@ parse_file_seq (char **stringp, unsigned int size, int stopchar,
 #endif /* !NO_ARCHIVES */
           NEWELT (concat (2, prefix, nlist[i]));
 
-      globfree (&gl);
+      if (globme)
+        globfree (&gl);
 
 #ifndef NO_ARCHIVES
       if (arname)
diff --git a/tests/scripts/functions/wildcard b/tests/scripts/functions/wildcard
index 2841f5d..bcd84ad 100644
--- a/tests/scripts/functions/wildcard
+++ b/tests/scripts/functions/wildcard
@@ -88,4 +88,16 @@ all: ; @echo $(wildcard xz--y*.7)
 !,
               '', "\n");
 
+# TEST #5: wildcard used to verify file existence
+
+touch('xxx.yyy');
+
+run_make_test(q!exists: ; @echo file=$(wildcard xxx.yyy)!,
+              '', "file=xxx.yyy\n");
+
+unlink('xxx.yyy');
+
+run_make_test(q!exists: ; @echo file=$(wildcard xxx.yyy)!,
+              '', "file=\n");
+
 1;
-- 
1.7.2.3