1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 // -std=gnu++XX automatically defines _GNU_SOURCE, which then means that <string.h>
30 // gives us the GNU variant, which is not what we're defining here.
31 #undef _GNU_SOURCE
32
33 #include <string.h>
34
35 #include <errno.h>
36 #include <limits.h>
37
38 #include <async_safe/log.h>
39
40 #include "private/ErrnoRestorer.h"
41
42 #include <string.h>
43
44 #include "bionic/pthread_internal.h"
45
46 static const char* __sys_error_descriptions[] = {
47 #define __BIONIC_ERRDEF(error_number, error_description) [error_number] = error_description,
48 #include "private/bionic_errdefs.h"
49 };
50
51 static const char* __sys_error_names[] = {
52 #define __BIONIC_ERRDEF(error_number, error_description) [error_number] = #error_number,
53 #include "private/bionic_errdefs.h"
54 };
55
strerrorname_np(int error_number)56 extern "C" const char* strerrorname_np(int error_number) {
57 if (error_number < 0 || error_number >= static_cast<int>(arraysize(__sys_error_names))) {
58 return nullptr;
59 }
60 return __sys_error_names[error_number];
61 }
62
__strerror_lookup(int error_number)63 static inline const char* __strerror_lookup(int error_number) {
64 if (error_number < 0 || error_number >= static_cast<int>(arraysize(__sys_error_descriptions))) {
65 return nullptr;
66 }
67 return __sys_error_descriptions[error_number];
68 }
69
strerror_r(int error_number,char * buf,size_t buf_len)70 int strerror_r(int error_number, char* buf, size_t buf_len) {
71 ErrnoRestorer errno_restorer;
72 size_t length;
73
74 const char* error_name = __strerror_lookup(error_number);
75 if (error_name != nullptr) {
76 length = strlcpy(buf, error_name, buf_len);
77 } else {
78 length = async_safe_format_buffer(buf, buf_len, "Unknown error %d", error_number);
79 }
80 if (length >= buf_len) {
81 return ERANGE;
82 }
83
84 return 0;
85 }
86
__gnu_strerror_r(int error_number,char * buf,size_t buf_len)87 extern "C" char* __gnu_strerror_r(int error_number, char* buf, size_t buf_len) {
88 ErrnoRestorer errno_restorer; // The glibc strerror_r doesn't set errno if it truncates...
89 strerror_r(error_number, buf, buf_len);
90 return buf; // ...and just returns whatever fit.
91 }
92
strerror(int error_number)93 char* strerror(int error_number) {
94 // Just return the original constant in the easy cases.
95 char* result = const_cast<char*>(__strerror_lookup(error_number));
96 if (result != nullptr) {
97 return result;
98 }
99
100 bionic_tls& tls = __get_bionic_tls();
101 result = tls.strerror_buf;
102 strerror_r(error_number, result, sizeof(tls.strerror_buf));
103 return result;
104 }
105