[linux-cifs-client] [PATCH 05/12] cifs: rename cifs_strlcpy_to_host and make it use new functions

[Jeff Layton]

Rename cifs_strlcpy_to_host to cifs_strndup since that better describes
what this function really does. Then, convert it to use the new string
conversion and measurement functions that work in units of bytes rather
than wide chars.

Signed-off-by: Jeff Layton <jlayton at redhat.com>
---
 fs/cifs/cifs_unicode.c |   41 +++++++++++++++++++++++++++++++++++++++++
 fs/cifs/cifs_unicode.h |    2 ++
 fs/cifs/cifssmb.c      |   48 +++++++-----------------------------------------
 3 files changed, 50 insertions(+), 41 deletions(-)

diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
index cd938bd..356f00c 100644
--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -245,3 +245,44 @@ cifs_strtoUCS(__le16 *to, const char *from, int len,
 	return i;
 }
 
+/*
+ * cifs_strndup - copy a string from wire format to the local codepage
+ * @dst - pointer to pointer of destination string
+ * @src - source string
+ * @maxlen - don't walk past this many bytes in the source string
+ * @is_unicode - is this a unicode string?
+ * @codepage - destination codepage
+ *
+ * Take a string given by the server, convert it to the local codepage and
+ * put it in a new buffer. Returns length of the new buffer in bytes or a
+ * negative error code. A pointer to the new buffer is placed into *dst.
+ */
+int
+cifs_strndup(char **dst, const char *src, const int maxlen,
+	     const bool is_unicode, const struct nls_table *codepage)
+{
+	int len;
+
+	if (is_unicode) {
+		len = cifs_ucs2_bytes((__le16 *) src, maxlen, codepage);
+		len += nls_nullsize(codepage);
+		*dst = kmalloc(len, GFP_KERNEL);
+		if (!*dst)
+			goto err_exit;
+		cifs_from_ucs2(*dst, (__le16 *) src, len, maxlen, codepage,
+			       false);
+	} else {
+		len = strnlen(src, maxlen);
+		len++;
+		*dst = kmalloc(len, GFP_KERNEL);
+		if (!*dst)
+			goto err_exit;
+		strlcpy(*dst, src, len);
+	}
+	return len;
+
+err_exit:
+	cERROR(1, ("Failed to allocate buffer for string\n"));
+	return -ENOMEM;
+}
+
diff --git a/fs/cifs/cifs_unicode.h b/fs/cifs/cifs_unicode.h
index 1857f5f..9c7c9fc 100644
--- a/fs/cifs/cifs_unicode.h
+++ b/fs/cifs/cifs_unicode.h
@@ -78,6 +78,8 @@ int cifs_ucs2_bytes(const __le16 *from, int maxbytes,
 		    const struct nls_table *codepage);
 int cifs_strfromUCS_le(char *, const __le16 *, int, const struct nls_table *);
 int cifs_strtoUCS(__le16 *, const char *, int, const struct nls_table *);
+int cifs_strndup(char **dst, const char *src, const int maxlen,
+		 const bool is_unicode, const struct nls_table *codepage);
 #endif
 
 /*
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index cadacae..be90f22 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -81,41 +81,6 @@ static struct {
 #endif /* CONFIG_CIFS_WEAK_PW_HASH */
 #endif /* CIFS_POSIX */
 
-/* Allocates buffer into dst and copies smb string from src to it.
- * caller is responsible for freeing dst if function returned 0.
- * returns:
- * 	on success - 0
- *	on failure - errno
- */
-static int
-cifs_strlcpy_to_host(char **dst, const char *src, const int maxlen,
-		 const bool is_unicode, const struct nls_table *nls_codepage)
-{
-	int plen;
-
-	if (is_unicode) {
-		plen = UniStrnlen((wchar_t *)src, maxlen);
-		*dst = kmalloc((4 * plen) + 2, GFP_KERNEL);
-		if (!*dst)
-			goto cifs_strlcpy_to_host_ErrExit;
-		cifs_strfromUCS_le(*dst, (__le16 *)src, plen, nls_codepage);
-		(*dst)[plen] = 0;
-		(*dst)[plen+1] = 0; /* needed for Unicode */
-	} else {
-		plen = strnlen(src, maxlen);
-		*dst = kmalloc(plen + 2, GFP_KERNEL);
-		if (!*dst)
-			goto cifs_strlcpy_to_host_ErrExit;
-		strlcpy(*dst, src, plen);
-	}
-	return 0;
-
-cifs_strlcpy_to_host_ErrExit:
-	cERROR(1, ("Failed to allocate buffer for string\n"));
-	return -ENOMEM;
-}
-
-
 /* Mark as invalid, all open files on tree connections since they
    were closed when session to server was lost */
 static void mark_open_files_invalid(struct cifsTconInfo *pTcon)
@@ -4008,19 +3973,20 @@ parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr,
 		/* copy DfsPath */
 		temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
 		max_len = data_end - temp;
-		rc = cifs_strlcpy_to_host(&(node->path_name), temp,
-					max_len, is_unicode, nls_codepage);
-		if (rc)
+		rc = cifs_strndup(&node->path_name, temp, max_len,
+				  is_unicode, nls_codepage);
+		if (rc < 0)
 			goto parse_DFS_referrals_exit;
 
 		/* copy link target UNC */
 		temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
 		max_len = data_end - temp;
-		rc = cifs_strlcpy_to_host(&(node->node_name), temp,
-					max_len, is_unicode, nls_codepage);
-		if (rc)
+		rc = cifs_strndup(&node->node_name, temp, max_len,
+				  is_unicode, nls_codepage);
+		if (rc < 0)
 			goto parse_DFS_referrals_exit;
 
+		rc = 0;
 		ref += le16_to_cpu(ref->Size);
 	}
 
-- 
1.6.0.6