1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/*
* eol.c : generic eol/keyword routines
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*/
#define APR_WANT_STRFUNC
#include <apr_file_io.h>
#include "svn_io.h"
#include "private/svn_eol_private.h"
#include "private/svn_dep_compat.h"
char *
svn_eol__find_eol_start(char *buf, apr_size_t len)
{
#if SVN_UNALIGNED_ACCESS_IS_OK
/* Scan the input one machine word at a time. */
for (; len > sizeof(apr_uintptr_t)
; buf += sizeof(apr_uintptr_t), len -= sizeof(apr_uintptr_t))
{
/* This is a variant of the well-known strlen test: */
apr_uintptr_t chunk = *(const apr_uintptr_t *)buf;
/* A byte in SVN__R_TEST is \0, iff it was \r in *BUF.
* Similarly, SVN__N_TEST is an indicator for \n. */
apr_uintptr_t r_test = chunk ^ SVN__R_MASK;
apr_uintptr_t n_test = chunk ^ SVN__N_MASK;
/* A byte in SVN__R_TEST can only be < 0x80, iff it has been \0 before
* (i.e. \r in *BUF). Ditto for SVN__N_TEST. */
r_test |= (r_test & SVN__LOWER_7BITS_SET) + SVN__LOWER_7BITS_SET;
n_test |= (n_test & SVN__LOWER_7BITS_SET) + SVN__LOWER_7BITS_SET;
/* Check whether at least one of the words contains a byte <0x80
* (if one is detected, there was a \r or \n in CHUNK). */
if ((r_test & n_test & SVN__BIT_7_SET) != SVN__BIT_7_SET)
break;
}
#endif
/* The remaining odd bytes will be examined the naive way: */
for (; len > 0; ++buf, --len)
{
if (*buf == '\n' || *buf == '\r')
return buf;
}
return NULL;
}
const char *
svn_eol__detect_eol(char *buf, apr_size_t len, char **eolp)
{
char *eol;
eol = svn_eol__find_eol_start(buf, len);
if (eol)
{
if (eolp)
*eolp = eol;
if (*eol == '\n')
return "\n";
/* We found a CR. */
++eol;
if (eol == buf + len || *eol != '\n')
return "\r";
return "\r\n";
}
return NULL;
}
|
