From 94f59f54921174fc156fade575ca114d331b1bd8 Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra@samba.org>
Date: Fri, 5 Sep 2003 19:59:55 +0000
Subject: [PATCH] More tuning from cachegrind. Change most trim_string() calls
 to trim_char(0, as that's what they do. Fix string_replace() to fast-path
 ascii. Jeremy. (This used to be commit
 f35e9a8b909d3c74be47083ccc4a4e91a14938db)

---
 source3/auth/auth.c              |  4 +-
 source3/auth/auth_rhosts.c       |  2 +-
 source3/auth/pampass.c           |  8 ++--
 source3/client/client.c          |  2 +-
 source3/intl/lang_tdb.c          |  4 +-
 source3/lib/charcnv.c            |  6 +--
 source3/lib/substitute.c         |  6 +--
 source3/lib/util.c               | 68 ++---------------------------
 source3/lib/util_str.c           | 75 +++++++++++++++++++++++++++++++-
 source3/libsmb/clifile.c         |  5 ++-
 source3/libsmb/namequery.c       |  2 +-
 source3/modules/vfs_recycle.c    |  2 +-
 source3/msdfs/msdfs.c            |  6 +--
 source3/nmbd/nmbd_browsesync.c   |  4 +-
 source3/nmbd/nmbd_serverlistdb.c |  2 +-
 source3/param/loadparm.c         |  6 +--
 source3/passdb/pdb_interface.c   |  4 +-
 source3/passdb/pdb_plugin.c      |  8 ++--
 source3/printing/lpq_parse.c     |  8 ++--
 source3/printing/nt_printing.c   |  2 +-
 source3/rpc_server/srv_dfs_nt.c  |  4 +-
 source3/smbd/chgpasswd.c         |  2 +-
 source3/smbd/filename.c          |  4 +-
 source3/smbd/statcache.c         |  7 +--
 source3/smbd/utmp.c              |  4 +-
 source3/smbd/vfs.c               |  4 +-
 26 files changed, 130 insertions(+), 119 deletions(-)

diff --git a/source3/auth/auth.c b/source3/auth/auth.c
index 668bba0d641..553d9a686e3 100644
--- a/source3/auth/auth.c
+++ b/source3/auth/auth.c
@@ -373,10 +373,10 @@ BOOL load_auth_module(struct auth_context *auth_context,
 	if (p) {
 		*p = 0;
 		module_params = p+1;
-		trim_string(module_params, " ", " ");
+		trim_char(module_params, ' ', ' ');
 	}
 	
-	trim_string(module_name, " ", " ");
+	trim_char(module_name, ' ', ' ');
 	
 	entry = auth_find_backend_entry(module_name);
 	
diff --git a/source3/auth/auth_rhosts.c b/source3/auth/auth_rhosts.c
index fab2d551f29..b295df9328f 100644
--- a/source3/auth/auth_rhosts.c
+++ b/source3/auth/auth_rhosts.c
@@ -40,7 +40,7 @@ static BOOL check_user_equiv(const char *user, const char *remote, const char *e
   if (! lines) return False;
   for (i=0; lines[i]; i++) {
     char *buf = lines[i];
-    trim_string(buf," "," ");
+    trim_char(buf,' ',' ');
 
     if (buf[0] != '#' && buf[0] != '\n') 
     {
diff --git a/source3/auth/pampass.c b/source3/auth/pampass.c
index d666e439b0d..3239686a20d 100644
--- a/source3/auth/pampass.c
+++ b/source3/auth/pampass.c
@@ -230,7 +230,7 @@ static struct chat_struct *make_pw_chat(char *p)
 		special_char_sub(prompt);
 		fstrcpy(t->prompt, prompt);
 		strlower_m(t->prompt);
-		trim_string(t->prompt, " ", " ");
+		trim_char(t->prompt, ' ', ' ');
 
 		if (!next_token(&p, reply, NULL, sizeof(fstring)))
 			break;
@@ -241,7 +241,7 @@ static struct chat_struct *make_pw_chat(char *p)
 		special_char_sub(reply);
 		fstrcpy(t->reply, reply);
 		strlower_m(t->reply);
-		trim_string(t->reply, " ", " ");
+		trim_char(t->reply, ' ', ' ');
 
 	}
 	return list;
@@ -304,7 +304,7 @@ static int smb_pam_passchange_conv(int num_msg,
 		case PAM_PROMPT_ECHO_ON:
 			DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
 			fstrcpy(current_prompt, msg[replies]->msg);
-			trim_string(current_prompt, " ", " ");
+			trim_char(current_prompt, ' ', ' ');
 			for (t=pw_chat; t; t=t->next) {
 
 				DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
@@ -335,7 +335,7 @@ static int smb_pam_passchange_conv(int num_msg,
 		case PAM_PROMPT_ECHO_OFF:
 			DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
 			fstrcpy(current_prompt, msg[replies]->msg);
-			trim_string(current_prompt, " ", " ");
+			trim_char(current_prompt, ' ', ' ');
 			for (t=pw_chat; t; t=t->next) {
 
 				DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
diff --git a/source3/client/client.c b/source3/client/client.c
index 67931b00b4d..ecece8942ec 100644
--- a/source3/client/client.c
+++ b/source3/client/client.c
@@ -1006,7 +1006,7 @@ static int cmd_mkdir(void)
 		*ddir2 = 0;
 		
 		pstrcpy(ddir,mask);
-		trim_string(ddir,".",NULL);
+		trim_char(ddir,'.','\0');
 		p = strtok(ddir,"/\\");
 		while (p) {
 			pstrcat(ddir2,p);
diff --git a/source3/intl/lang_tdb.c b/source3/intl/lang_tdb.c
index 87ef4e39c7b..f12b9b6f151 100644
--- a/source3/intl/lang_tdb.c
+++ b/source3/intl/lang_tdb.c
@@ -53,8 +53,8 @@ static BOOL load_msg(const char *msg_file)
 		}
 		if (msgid && strncmp(lines[i], "msgstr \"", 8) == 0) {
 			msgstr = lines[i] + 8;
-			trim_string(msgid, NULL, "\"");
-			trim_string(msgstr, NULL, "\"");
+			trim_char(msgid, '\0', '\"');
+			trim_char(msgstr, '\0', '\"');
 			if (*msgstr == 0) {
 				msgstr = msgid;
 			}
diff --git a/source3/lib/charcnv.c b/source3/lib/charcnv.c
index a07ff7399d9..ceb9d57fc71 100644
--- a/source3/lib/charcnv.c
+++ b/source3/lib/charcnv.c
@@ -879,9 +879,8 @@ size_t pull_ucs2(const void *base_ptr, char *dest, const void *src, size_t dest_
 	}
 
 	if (flags & STR_TERMINATE) {
-		if (src_len == (size_t)-1) {
-			src_len = strlen_w(src)*2 + 2;
-		} else {
+		/* src_len -1 is the default for null terminated strings. */
+		if (src_len != (size_t)-1) {
 			size_t len = strnlen_w(src, src_len/2);
 			if (len < src_len/2)
 				len++;
@@ -1051,4 +1050,3 @@ size_t align_string(const void *base_ptr, const char *p, int flags)
 	}
 	return 0;
 }
-
diff --git a/source3/lib/substitute.c b/source3/lib/substitute.c
index a73f9d85dab..28466e43f29 100644
--- a/source3/lib/substitute.c
+++ b/source3/lib/substitute.c
@@ -57,7 +57,7 @@ void set_local_machine_name(const char* local_name, BOOL perm)
 	already_perm = perm;
 
 	fstrcpy(tmp_local_machine,local_name);
-	trim_string(tmp_local_machine," "," ");
+	trim_char(tmp_local_machine,' ',' ');
 	alpha_strcpy(local_machine,tmp_local_machine,SAFE_NETBIOS_CHARS,sizeof(local_machine)-1);
 	strlower_m(local_machine);
 }
@@ -79,7 +79,7 @@ void set_remote_machine_name(const char* remote_name, BOOL perm)
 	already_perm = perm;
 
 	fstrcpy(tmp_remote_machine,remote_name);
-	trim_string(tmp_remote_machine," "," ");
+	trim_char(tmp_remote_machine,' ',' ');
 	alpha_strcpy(remote_machine,tmp_remote_machine,SAFE_NETBIOS_CHARS,sizeof(remote_machine)-1);
 	strlower_m(remote_machine);
 }
@@ -111,7 +111,7 @@ void sub_set_smb_name(const char *name)
 		return;
 
 	fstrcpy(tmp,name);
-	trim_string(tmp," "," ");
+	trim_char(tmp,' ',' ');
 	strlower_m(tmp);
 	alpha_strcpy(smb_user_name,tmp,SAFE_NETBIOS_CHARS,sizeof(smb_user_name)-1);
 }
diff --git a/source3/lib/util.c b/source3/lib/util.c
index 5f4fae9baa2..766c5041b4e 100644
--- a/source3/lib/util.c
+++ b/source3/lib/util.c
@@ -261,7 +261,7 @@ BOOL init_names(void)
 	}			
 
 	fstrcpy( local_machine, global_myname() );
-	trim_string( local_machine, " ", " " );
+	trim_char( local_machine, ' ', ' ' );
 	p = strchr( local_machine, ' ' );
 	if (p)
 		*p = 0;
@@ -605,68 +605,6 @@ void unix_clean_name(char *s)
 	trim_string(s,NULL,"/..");
 }
 
-/*******************************************************************
- Convert '\' to '/'.
- Reduce a file name, removing or reducing /../ , /./ , // elements.
- Remove also any trailing . and /
- Return a new allocated string.
-********************************************************************/
-
-smb_ucs2_t *unix_clean_path(const smb_ucs2_t *s)
-{
-	smb_ucs2_t *ns;
-	smb_ucs2_t *p, *r, *t;
-
-	DEBUG(3, ("unix_clean_path\n")); /*  [%unicode]\n")); */
-	if(!s)
-		return NULL;
-
-	/* convert '\' to '/' */
-	ns = strdup_w(s);
-	if (!ns)
-		return NULL;
-	unix_format_w(ns);
-
-	/* remove all double slashes */
-	p = ns;
-	ns = all_string_sub_wa(p, "//", "/");
-	SAFE_FREE(p);
-	if (!ns)
-		return NULL;
-
-	/* remove any /./ */
-	p = ns;
-	ns = all_string_sub_wa(p, "/./", "/");
-	SAFE_FREE(p);
-	if (!ns)
-		return NULL;
-
-	/* reduce any /../ */
-	t = ns;
-	while (*t && (r = strstr_wa(t, "/.."))) {
-		t = &(r[3]);
-		if (*t == UCS2_CHAR('/') || *t == 0) {
-			*r = 0;
-			p = strrchr_w(ns, UCS2_CHAR('/'));
-			if (!p)
-				p = ns;
-			if (*t == 0)
-				*p = 0;
-			else
-				memmove(p, t, (strlen_w(t) + 1) * sizeof(smb_ucs2_t));
-			t = p;
-		}
-	}
-
-	/* remove any leading ./ trailing /. */
-	trim_string_wa(ns, "./", "/.");
-
-	/* remove any leading and trailing / */
-	trim_string_wa(ns, "/", "/");
-
-	return ns;
-}
-
 /****************************************************************************
  Make a dir struct.
 ****************************************************************************/
@@ -2205,7 +2143,7 @@ char *lock_path(const char *name)
 	static pstring fname;
 
 	pstrcpy(fname,lp_lockdir());
-	trim_string(fname,"","/");
+	trim_char(fname,'\0','/');
 	
 	if (!directory_exist(fname,NULL))
 		mkdir(fname,0755);
@@ -2225,7 +2163,7 @@ char *pid_path(const char *name)
 	static pstring fname;
 
 	pstrcpy(fname,lp_piddir());
-	trim_string(fname,"","/");
+	trim_char(fname,'\0','/');
 
 	if (!directory_exist(fname,NULL))
 		mkdir(fname,0755);
diff --git a/source3/lib/util_str.c b/source3/lib/util_str.c
index 70567f88afd..82b312e2415 100644
--- a/source3/lib/util_str.c
+++ b/source3/lib/util_str.c
@@ -364,9 +364,27 @@ BOOL strisnormal(const char *s)
 
 void string_replace(pstring s,char oldc,char newc)
 {
-	push_ucs2(NULL, tmpbuf,s, sizeof(tmpbuf), STR_TERMINATE);
+	unsigned char *p;
+
+	/* 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
+	   (ie. they match for the first 128 chars) */
+
+	for (p = (unsigned char *)s; *p; p++) {
+		if (*p & 0x80) /* mb string - slow path. */
+			break;
+		if (*p == oldc)
+			*p = newc;
+	}
+
+	if (!*p)
+		return;
+
+	/* Slow (mb) path. */
+	push_ucs2(NULL, tmpbuf, p, sizeof(tmpbuf), STR_TERMINATE);
 	string_replace_w(tmpbuf, UCS2_CHAR(oldc), UCS2_CHAR(newc));
-	pull_ucs2(NULL, s, tmpbuf, -1, sizeof(tmpbuf), STR_TERMINATE);
+	pull_ucs2(NULL, p, tmpbuf, -1, sizeof(tmpbuf), STR_TERMINATE);
 }
 
 /**
@@ -406,6 +424,59 @@ size_t str_ascii_charnum(const char *s)
 	return strlen(tmpbuf2);
 }
 
+BOOL trim_char(char *s,char cfront,char cback)
+{
+	BOOL ret = False;
+	char *ep;
+	char *fp = s;
+
+	/* Ignore null or empty strings. */
+	if (!s || (s[0] == '\0'))
+		return False;
+
+	if (cfront) {
+		while (*fp && *fp == cfront)
+			fp++;
+		if (!*fp) {
+			/* We ate the string. */
+			s[0] = '\0';
+			return True;
+		}
+		if (fp != s)
+			ret = True;
+	}
+
+	ep = fp + strlen(fp) - 1;
+	if (cback) {
+		/* Attempt ascii only. Bail for mb strings. */
+		while ((ep >= fp) && (*ep == cback)) {
+			ret = True;
+			if ((ep > fp) && (((unsigned char)ep[-1]) & 0x80)) {
+				/* Could be mb... bail back to tim_string. */
+				char fs[2], bs[2];
+				if (cfront) {
+					fs[0] = cfront;
+					fs[1] = '\0';
+				}
+				bs[0] = cback;
+				bs[1] = '\0';
+				return trim_string(s, cfront ? fs : NULL, bs);
+			} else {
+				ep--;
+			}
+		}
+		if (ep < fp) {
+			/* We ate the string. */
+			s[0] = '\0';
+			return True;
+		}
+	}
+
+	ep[1] = '\0';
+	memmove(s, fp, ep-fp+2);
+	return ret;
+}
+
 /**
  Trim the specified elements off the front and back of a string.
 **/
diff --git a/source3/libsmb/clifile.c b/source3/libsmb/clifile.c
index f021076a46c..c7f0cdb84b5 100644
--- a/source3/libsmb/clifile.c
+++ b/source3/libsmb/clifile.c
@@ -951,8 +951,9 @@ BOOL cli_chkpath(struct cli_state *cli, const char *path)
 	char *p;
 	
 	pstrcpy(path2,path);
-	trim_string(path2,NULL,"\\");
-	if (!*path2) *path2 = '\\';
+	trim_char(path2,'\0','\\');
+	if (!*path2)
+		*path2 = '\\';
 	
 	memset(cli->outbuf,'\0',smb_size);
 	set_message(cli->outbuf,0,0,True);
diff --git a/source3/libsmb/namequery.c b/source3/libsmb/namequery.c
index 9875f77c72e..1de74137117 100644
--- a/source3/libsmb/namequery.c
+++ b/source3/libsmb/namequery.c
@@ -61,7 +61,7 @@ static struct node_status *parse_node_status(char *p, int *num_names)
 	p++;
 	for (i=0;i< *num_names;i++) {
 		StrnCpy(ret[i].name,p,15);
-		trim_string(ret[i].name,NULL," ");
+		trim_char(ret[i].name,'\0',' ');
 		ret[i].type = CVAL(p,15);
 		ret[i].flags = p[16];
 		p += 18;
diff --git a/source3/modules/vfs_recycle.c b/source3/modules/vfs_recycle.c
index c0b331b8621..b1b2ac03538 100644
--- a/source3/modules/vfs_recycle.c
+++ b/source3/modules/vfs_recycle.c
@@ -336,7 +336,7 @@ static int recycle_unlink(vfs_handle_struct *handle, connection_struct *conn, co
 	repository = alloc_sub_conn(conn, recycle_repository(handle));
 	ALLOC_CHECK(repository, done);
 	/* shouldn't we allow absolute path names here? --metze */
-	trim_string(repository, "/", "/");
+	trim_char(repository, '/', '/');
 	
 	if(!repository || *(repository) == '\0') {
 		DEBUG(3, ("recycle: repository path not set, purging %s...\n", file_name));
diff --git a/source3/msdfs/msdfs.c b/source3/msdfs/msdfs.c
index dc326f2eee8..afe523bf19b 100644
--- a/source3/msdfs/msdfs.c
+++ b/source3/msdfs/msdfs.c
@@ -40,7 +40,7 @@ static BOOL parse_dfs_path(char* pathname, struct dfs_path* pdp)
 
 	ZERO_STRUCTP(pdp);
 
-	trim_string(temp,"\\","\\");
+	trim_char(temp,'\\','\\');
 	DEBUG(10,("temp in parse_dfs_path: .%s. after trimming \\'s\n",temp));
 
 	/* now tokenize */
@@ -275,7 +275,7 @@ static BOOL resolve_dfs_path(char* dfspath, struct dfs_path* dp,
 				char *q;
 				pstring buf;
 				pstrcpy(buf, dfspath);
-				trim_string(buf, NULL, "\\");
+				trim_char(buf, '\0', '\\');
 				for (; consumed_level; consumed_level--) {
 					q = strrchr(buf, '\\');
 					if (q) *q = 0;
@@ -780,7 +780,7 @@ BOOL create_msdfs_link(struct junction_map* jn, BOOL exists)
 	for(i=0; i<jn->referral_count; i++) {
 		char* refpath = jn->referral_list[i].alternate_path;
       
-		trim_string(refpath, "\\", "\\");
+		trim_char(refpath, '\\', '\\');
 		if(*refpath == '\0') {
 			if (i == 0)
 				insert_comma = False;
diff --git a/source3/nmbd/nmbd_browsesync.c b/source3/nmbd/nmbd_browsesync.c
index 96e8fd1b815..6cde88651f9 100644
--- a/source3/nmbd/nmbd_browsesync.c
+++ b/source3/nmbd/nmbd_browsesync.c
@@ -204,7 +204,7 @@ static void domain_master_node_status_success(struct subnet_record *subrec,
 			pull_ascii_nstring(qname, p);
 			name_type = CVAL(p,15);
 			nb_flags = get_nb_flags(&p[16]);
-			trim_string(qname,NULL," ");
+			trim_char(qname,'\0',' ');
 
 			p += 18;
 
@@ -427,7 +427,7 @@ static void get_domain_master_name_node_status_success(struct subnet_record *sub
 			pull_ascii_nstring(qname, p);
 			name_type = CVAL(p,15);
 			nb_flags = get_nb_flags(&p[16]);
-			trim_string(qname,NULL," ");
+			trim_char(qname,'\0',' ');
 
 			p += 18;
 
diff --git a/source3/nmbd/nmbd_serverlistdb.c b/source3/nmbd/nmbd_serverlistdb.c
index a5008f803b4..cdb1089a54f 100644
--- a/source3/nmbd/nmbd_serverlistdb.c
+++ b/source3/nmbd/nmbd_serverlistdb.c
@@ -328,7 +328,7 @@ void write_browse_list(time_t t, BOOL force_write)
 	updatecount++;
     
 	pstrcpy(fname,lp_lockdir());
-	trim_string(fname,NULL,"/");
+	trim_char(fname,'\0' ,'/');
 	pstrcat(fname,"/");
 	pstrcat(fname,SERVER_LIST);
 	pstrcpy(fnamenew,fname);
diff --git a/source3/param/loadparm.c b/source3/param/loadparm.c
index 3d0aebf230b..c801c4c522f 100644
--- a/source3/param/loadparm.c
+++ b/source3/param/loadparm.c
@@ -1558,8 +1558,8 @@ static char *lp_string(const char *s)
 		lp_talloc = talloc_init("lp_talloc");
 
 	tmpstr = alloc_sub_basic(current_user_info.smb_name, s);
-	if (trim_string(tmpstr, "\"", "\"")) {
-		if (strchr(tmpstr,'"') != NULL) {
+	if (trim_char(tmpstr, '\"', '\"')) {
+		if (strchr(tmpstr,'\"') != NULL) {
 			SAFE_FREE(tmpstr);
 			tmpstr = alloc_sub_basic(current_user_info.smb_name,s);
 		}
@@ -3112,7 +3112,7 @@ BOOL lp_do_parameter(int snum, const char *pszParmName, const char *pszParmValue
 			pstr_sprintf(param_key, "%s:", pszParmName);
 			slen = strlen(param_key);
 			pstrcat(param_key, sep+1);
-			trim_string(param_key+slen, " ", " ");
+			trim_char(param_key+slen, ' ', ' ');
 			not_added = True;
 			data = (snum < 0) ? Globals.param_opt : 
 				ServicePtrs[snum]->param_opt;
diff --git a/source3/passdb/pdb_interface.c b/source3/passdb/pdb_interface.c
index 5ebc14030f0..d548081e78b 100644
--- a/source3/passdb/pdb_interface.c
+++ b/source3/passdb/pdb_interface.c
@@ -422,10 +422,10 @@ static NTSTATUS make_pdb_methods_name(struct pdb_methods **methods, struct pdb_c
 	if (p) {
 		*p = 0;
 		module_location = p+1;
-		trim_string(module_location, " ", " ");
+		trim_char(module_location, ' ', ' ');
 	}
 
-	trim_string(module_name, " ", " ");
+	trim_char(module_name, ' ', ' ');
 
 
 	DEBUG(5,("Attempting to find an passdb backend to match %s (%s)\n", selected, module_name));
diff --git a/source3/passdb/pdb_plugin.c b/source3/passdb/pdb_plugin.c
index ea67da23a55..027cd0b5d33 100644
--- a/source3/passdb/pdb_plugin.c
+++ b/source3/passdb/pdb_plugin.c
@@ -41,9 +41,11 @@ NTSTATUS pdb_init_plugin(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, con
 	if (p) {
 		*p = 0;
 		plugin_location = p+1;
-		trim_string(plugin_location, " ", " ");
-	} else plugin_location = NULL;
-	trim_string(plugin_name, " ", " ");
+		trim_char(plugin_location, ' ', ' ');
+	} else {
+		plugin_location = NULL;
+	}
+	trim_char(plugin_name, ' ', ' ');
 
 	DEBUG(5, ("Trying to load sam plugin %s\n", plugin_name));
 	dl_handle = sys_dlopen(plugin_name, RTLD_NOW );
diff --git a/source3/printing/lpq_parse.c b/source3/printing/lpq_parse.c
index 0acca67b704..111617e3aed 100644
--- a/source3/printing/lpq_parse.c
+++ b/source3/printing/lpq_parse.c
@@ -766,14 +766,14 @@ static BOOL parse_lpq_nt(char *line,print_queue_struct *buf,BOOL first)
 
   /* Make sure the status is valid */
   parse_line.space2 = '\0';
-  trim_string(parse_line.status, NULL, " ");
+  trim_char(parse_line.status, '\0', ' ');
   if (!strequal(parse_line.status, LPRNT_PRINTING) &&
       !strequal(parse_line.status, LPRNT_PAUSED) &&
       !strequal(parse_line.status, LPRNT_WAITING))
     return(False);
   
   parse_line.space3 = '\0';
-  trim_string(parse_line.jobname, NULL, " ");
+  trim_char(parse_line.jobname, '\0', ' ');
 
   buf->job = atoi(parse_line.jobid);
   buf->priority = 0;
@@ -837,7 +837,7 @@ static BOOL parse_lpq_os2(char *line,print_queue_struct *buf,BOOL first)
 
   /* Get the job name */
   parse_line.space2[0] = '\0';
-  trim_string(parse_line.jobname, NULL, " ");
+  trim_char(parse_line.jobname, '\0', ' ');
   fstrcpy(buf->fs_file, parse_line.jobname);
 
   buf->priority = 0;
@@ -850,7 +850,7 @@ static BOOL parse_lpq_os2(char *line,print_queue_struct *buf,BOOL first)
 
   /* Make sure we have a valid status */
   parse_line.space4[0] = '\0';
-  trim_string(parse_line.status, NULL, " ");
+  trim_char(parse_line.status, '\0', ' ');
   if (!strequal(parse_line.status, LPROS2_PRINTING) &&
       !strequal(parse_line.status, LPROS2_PAUSED) &&
       !strequal(parse_line.status, LPROS2_WAITING))
diff --git a/source3/printing/nt_printing.c b/source3/printing/nt_printing.c
index b4a551c1612..4859d785be6 100644
--- a/source3/printing/nt_printing.c
+++ b/source3/printing/nt_printing.c
@@ -2026,7 +2026,7 @@ static WERROR update_a_printer_2(NT_PRINTER_INFO_LEVEL_2 *info)
 
 	if (info->servername[0]!='\0') {
 		trim_string(info->printername, info->servername, NULL);
-		trim_string(info->printername, "\\", NULL);
+		trim_char(info->printername, '\\', '\0');
 		info->servername[0]='\0';
 	}
 
diff --git a/source3/rpc_server/srv_dfs_nt.c b/source3/rpc_server/srv_dfs_nt.c
index eba4eaec756..3470ad99b45 100644
--- a/source3/rpc_server/srv_dfs_nt.c
+++ b/source3/rpc_server/srv_dfs_nt.c
@@ -159,7 +159,7 @@ WERROR _dfs_remove(pipes_struct *p, DFS_Q_DFS_REMOVE *q_u,
 	{
 	  pstring refpath;
 	  pstrcpy(refpath,jn.referral_list[i].alternate_path);
-	  trim_string(refpath, "\\", "\\");
+	  trim_char(refpath, '\\', '\\');
 	  DEBUG(10,("_dfs_remove:  refpath: .%s.\n", refpath));
 	  if(strequal(refpath, altpath))
 	    {
@@ -257,7 +257,7 @@ static BOOL init_reply_dfs_info_3(TALLOC_CTX *ctx, struct junction_map* j, DFS_I
 	  struct referral* ref = &(j[i].referral_list[ii]);
 	  
 	  pstrcpy(path, ref->alternate_path);
-	  trim_string(path,"\\","");
+	  trim_char(path,'\\','\0');
 	  p = strrchr_m(path,'\\');
 	  if(p==NULL)
 	    {
diff --git a/source3/smbd/chgpasswd.c b/source3/smbd/chgpasswd.c
index 0009f09028d..d99570ff7c0 100644
--- a/source3/smbd/chgpasswd.c
+++ b/source3/smbd/chgpasswd.c
@@ -259,7 +259,7 @@ static int expect(int master, char *issue, char *expected)
 				/* Eat leading/trailing whitespace before match. */
 				pstring str;
 				pstrcpy( str, buffer);
-				trim_string( str, " ", " ");
+				trim_char( str, ' ', ' ');
 
 				if ((match = (unix_wild_match(expected, str) == 0)))
 					timeout = 200;
diff --git a/source3/smbd/filename.c b/source3/smbd/filename.c
index ad107f9c3e1..643e315c069 100644
--- a/source3/smbd/filename.c
+++ b/source3/smbd/filename.c
@@ -125,7 +125,7 @@ BOOL unix_convert(pstring name,connection_struct *conn,char *saved_last_componen
 	 * also trim trailing /'s.
 	 */
 
-	trim_string(name,"/","/");
+	trim_char(name,'/','/');
 
 	/*
 	 * If we trimmed down to a single '\0' character
@@ -164,7 +164,7 @@ BOOL unix_convert(pstring name,connection_struct *conn,char *saved_last_componen
 		return(True);
 
 	start = name;
-	while (strncmp(start,"./",2) == 0)
+	while (start[0] == '.' && start[1] == '/')
 		start += 2;
 
 	pstrcpy(orig_path, name);
diff --git a/source3/smbd/statcache.c b/source3/smbd/statcache.c
index fbebdb240f4..28915a30a08 100644
--- a/source3/smbd/statcache.c
+++ b/source3/smbd/statcache.c
@@ -66,11 +66,12 @@ void stat_cache_add( const char *full_orig_name, const char *orig_translated_pat
 		return;
 
 	/*
-	 * Don't cache trivial valid directory entries.
+	 * Don't cache trivial valid directory entries such as . and ..
 	 */
 
-	if((*full_orig_name == '\0') || (strcmp(full_orig_name, ".") == 0) ||
-			(strcmp(full_orig_name, "..") == 0))
+	if((*full_orig_name == '\0') || (full_orig_name[0] == '.' && 
+				((full_orig_name[1] == '\0') ||
+				 (full_orig_name[1] == '.' && full_orig_name[1] == '\0'))))
 		return;
 
 	/*
diff --git a/source3/smbd/utmp.c b/source3/smbd/utmp.c
index d57e475ce26..a521d0113d4 100644
--- a/source3/smbd/utmp.c
+++ b/source3/smbd/utmp.c
@@ -217,13 +217,13 @@ static void uw_pathname(pstring fname, const char *uw_name, const char *uw_defau
 	/* For w-files, first look for explicit "wtmp dir" */
 	if (uw_name[0] == 'w') {
 		pstrcpy(dirname,lp_wtmpdir());
-		trim_string(dirname,"","/");
+		trim_char(dirname,'\0','/');
 	}
 
 	/* For u-files and non-explicit w-dir, look for "utmp dir" */
 	if (dirname == 0 || strlen(dirname) == 0) {
 		pstrcpy(dirname,lp_utmpdir());
-		trim_string(dirname,"","/");
+		trim_char(dirname,'\0','/');
 	}
 
 	/* If explicit directory above, use it */
diff --git a/source3/smbd/vfs.c b/source3/smbd/vfs.c
index 58a8a387925..753db4cece3 100644
--- a/source3/smbd/vfs.c
+++ b/source3/smbd/vfs.c
@@ -233,10 +233,10 @@ BOOL vfs_init_custom(connection_struct *conn, const char *vfs_object)
 	if (p) {
 		*p = 0;
 		module_param = p+1;
-		trim_string(module_param, " ", " ");
+		trim_char(module_param, ' ', ' ');
 	}
 
-	trim_string(module_name, " ", " ");
+	trim_char(module_name, ' ', ' ');
 
 	/* First, try to load the module with the new module system */
 	if((entry = vfs_find_backend_entry(module_name)) || 
-- 
2.34.1