2 * eol.c : generic eol/keyword routines
4 * ====================================================================
5 * Licensed to the Apache Software Foundation (ASF) under one
6 * or more contributor license agreements. See the NOTICE file
7 * distributed with this work for additional information
8 * regarding copyright ownership. The ASF licenses this file
9 * to you under the Apache License, Version 2.0 (the
10 * "License"); you may not use this file except in compliance
11 * with the License. You may obtain a copy of the License at
13 * http://www.apache.org/licenses/LICENSE-2.0
15 * Unless required by applicable law or agreed to in writing,
16 * software distributed under the License is distributed on an
17 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 * KIND, either express or implied. See the License for the
19 * specific language governing permissions and limitations
21 * ====================================================================
26 #define APR_WANT_STRFUNC
28 #include <apr_file_io.h>
30 #include "private/svn_eol_private.h"
31 #include "private/svn_dep_compat.h"
33 /* Machine-word-sized masks used in svn_eol__find_eol_start.
36 svn_eol__find_eol_start(char *buf
, apr_size_t len
)
38 #if !SVN_UNALIGNED_ACCESS_IS_OK
40 /* On some systems, we need to make sure that buf is properly aligned
41 * for chunky data access. This overhead is still justified because
42 * only lines tend to be tens of chars long.
44 for (; (len
> 0) && ((apr_uintptr_t
)buf
) & (sizeof(apr_uintptr_t
)-1)
47 if (*buf
== '\n' || *buf
== '\r')
53 /* Scan the input one machine word at a time. */
54 for (; len
> sizeof(apr_uintptr_t
)
55 ; buf
+= sizeof(apr_uintptr_t
), len
-= sizeof(apr_uintptr_t
))
57 /* This is a variant of the well-known strlen test: */
58 apr_uintptr_t chunk
= *(const apr_uintptr_t
*)buf
;
60 /* A byte in SVN__R_TEST is \0, iff it was \r in *BUF.
61 * Similarly, SVN__N_TEST is an indicator for \n. */
62 apr_uintptr_t r_test
= chunk
^ SVN__R_MASK
;
63 apr_uintptr_t n_test
= chunk
^ SVN__N_MASK
;
65 /* A byte in SVN__R_TEST can by < 0x80, iff it has been \0 before
66 * (i.e. \r in *BUF). Dito for SVN__N_TEST. */
67 r_test
|= (r_test
& SVN__LOWER_7BITS_SET
) + SVN__LOWER_7BITS_SET
;
68 n_test
|= (n_test
& SVN__LOWER_7BITS_SET
) + SVN__LOWER_7BITS_SET
;
70 /* Check whether at least one of the words contains a byte <0x80
71 * (if one is detected, there was a \r or \n in CHUNK). */
72 if ((r_test
& n_test
& SVN__BIT_7_SET
) != SVN__BIT_7_SET
)
76 /* The remaining odd bytes will be examined the naive way: */
77 for (; len
> 0; ++buf
, --len
)
79 if (*buf
== '\n' || *buf
== '\r')
87 svn_eol__detect_eol(char *buf
, apr_size_t len
, char **eolp
)
91 eol
= svn_eol__find_eol_start(buf
, len
);
102 if (eol
== buf
+ len
|| *eol
!= '\n')