Adapt the kwset code to Git

Signed-off-by: Fredrik Kuivinen <frekui@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

kwset.c

@@ -1,3 +1,9 @@
+/*
+ * This file has been copied from commit e7ac713d^ in the GNU grep git
+ * repository. A few small changes have been made to adapt the code to
+ * Git.
+ */
+
 /* kwset.c - search for any of a set of keywords.
    Copyright 1989, 1998, 2000, 2005 Free Software Foundation, Inc.
 
@@ -28,22 +34,13 @@
    String Matching:  An Aid to Bibliographic Search," CACM June 1975,
    Vol. 18, No. 6, which describes the failure function used below. */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-#include <sys/types.h>
-#include "system.h"
+#include "cache.h"
+
 #include "kwset.h"
 #include "obstack.h"
 
-#ifdef GREP
-extern char *xmalloc();
-# undef malloc
-# define malloc xmalloc
-#endif
-
 #define NCHAR (UCHAR_MAX + 1)
-#define obstack_chunk_alloc malloc
+#define obstack_chunk_alloc xmalloc
 #define obstack_chunk_free free
 
 #define U(c) ((unsigned char) (c))
@@ -93,9 +90,7 @@ kwsalloc (char const *trans)
 {
   struct kwset *kwset;
 
-  kwset = (struct kwset *) malloc(sizeof (struct kwset));
-  if (!kwset)
-    return NULL;
+  kwset = (struct kwset *) xmalloc(sizeof (struct kwset));
 
   obstack_init(&kwset->obstack);
   kwset->words = 0;
@@ -174,7 +169,7 @@ kwsincr (kwset_t kws, char const *text, size_t len)
 	  link = (struct tree *) obstack_alloc(&kwset->obstack,
 					       sizeof (struct tree));
 	  if (!link)
-	    return _("memory exhausted");
+	    return "memory exhausted";
 	  link->llink = NULL;
 	  link->rlink = NULL;
 	  link->trie = (struct trie *) obstack_alloc(&kwset->obstack,
@@ -182,7 +177,7 @@ kwsincr (kwset_t kws, char const *text, size_t len)
 	  if (!link->trie)
 	    {
 	      obstack_free(&kwset->obstack, link);
-	      return _("memory exhausted");
+	      return "memory exhausted";
 	    }
 	  link->trie->accepting = 0;
 	  link->trie->links = NULL;
@@ -405,7 +400,7 @@ kwsprep (kwset_t kws)
       /* Looking for just one string.  Extract it from the trie. */
       kwset->target = obstack_alloc(&kwset->obstack, kwset->mind);
       if (!kwset->target)
-	return _("memory exhausted");
+	return "memory exhausted";
       for (i = kwset->mind - 1, curr = kwset->trie; i >= 0; --i)
 	{
 	  kwset->target[i] = curr->links->label;
@@ -597,9 +592,7 @@ cwexec (kwset_t kws, char const *text, size_t len, struct kwsmatch *kwsmatch)
   register struct tree const *tree;
   register char const *trans;
 
-#ifdef lint
   accept = NULL;
-#endif
 
   /* Initialize register copies and look for easy ways out. */
   kwset = (struct kwset *) kws;

kwset.h

@@ -1,3 +1,8 @@
+/* This file has been copied from commit e7ac713d^ in the GNU grep git
+ * repository. A few small changes have been made to adapt the code to
+ * Git.
+ */
+
 /* kwset.h - header declaring the keyword set library.
    Copyright (C) 1989, 1998, 2005 Free Software Foundation, Inc.
 
@@ -27,22 +32,23 @@ struct kwsmatch
   size_t size[1];		/* Length of each submatch. */
 };
 
-typedef ptr_t kwset_t;
+struct kwset_t;
+typedef struct kwset_t* kwset_t;
 
 /* Return an opaque pointer to a newly allocated keyword set, or NULL
    if enough memory cannot be obtained.  The argument if non-NULL
    specifies a table of character translations to be applied to all
    pattern and search text. */
-extern kwset_t kwsalloc PARAMS((char const *));
+extern kwset_t kwsalloc(char const *);
 
 /* Incrementally extend the keyword set to include the given string.
    Return NULL for success, or an error message.  Remember an index
    number for each keyword included in the set. */
-extern const char *kwsincr PARAMS((kwset_t, char const *, size_t));
+extern const char *kwsincr(kwset_t, char const *, size_t);
 
 /* When the keyword set has been completely built, prepare it for
    use.  Return NULL for success, or an error message. */
-extern const char *kwsprep PARAMS((kwset_t));
+extern const char *kwsprep(kwset_t);
 
 /* Search through the given buffer for a member of the keyword set.
    Return a pointer to the leftmost longest match found, or NULL if
@@ -50,7 +56,8 @@ extern const char *kwsprep PARAMS((kwset_t));
    the matching substring in the integer it points to.  Similarly,
    if foundindex is non-NULL, store the index of the particular
    keyword found therein. */
-extern size_t kwsexec PARAMS((kwset_t, char const *, size_t, struct kwsmatch *));
+extern size_t kwsexec(kwset_t, char const *, size_t, struct kwsmatch *);
 
 /* Deallocate the given keyword set and all its associated storage. */
-extern void kwsfree PARAMS((kwset_t));
+extern void kwsfree(kwset_t);
+