1 /* $OpenBSD: strerror_r.c,v 1.6 2005/08/08 08:05:37 espie Exp $ */
2 /* Public Domain <marc@snafu.org> */
3
4 #include <errno.h>
5 #include <limits.h>
6 #include <signal.h>
7 #include <stdio.h>
8 #include <string.h>
9
10 #include "private/ErrnoRestorer.h"
11 #include "private/libc_logging.h"
12
13 struct Pair {
14 int code;
15 const char* msg;
16 };
17
__code_string_lookup(const Pair * strings,int code)18 static const char* __code_string_lookup(const Pair* strings, int code) {
19 for (size_t i = 0; strings[i].msg != NULL; ++i) {
20 if (strings[i].code == code) {
21 return strings[i].msg;
22 }
23 }
24 return NULL;
25 }
26
27 static const Pair _sys_error_strings[] = {
28 #define __BIONIC_ERRDEF(x,y,z) { x, z },
29 #include <sys/_errdefs.h>
30 { 0, NULL }
31 };
32
__strerror_lookup(int error_number)33 extern "C" __LIBC_HIDDEN__ const char* __strerror_lookup(int error_number) {
34 return __code_string_lookup(_sys_error_strings, error_number);
35 }
36
37 static const Pair _sys_signal_strings[] = {
38 #define __BIONIC_SIGDEF(signal_number, signal_description) { signal_number, signal_description },
39 #include <sys/_sigdefs.h>
40 { 0, NULL }
41 };
42
__strsignal_lookup(int signal_number)43 extern "C" __LIBC_HIDDEN__ const char* __strsignal_lookup(int signal_number) {
44 return __code_string_lookup(_sys_signal_strings, signal_number);
45 }
46
strerror_r(int error_number,char * buf,size_t buf_len)47 int strerror_r(int error_number, char* buf, size_t buf_len) {
48 ErrnoRestorer errno_restorer;
49 size_t length;
50
51 const char* error_name = __strerror_lookup(error_number);
52 if (error_name != NULL) {
53 length = strlcpy(buf, error_name, buf_len);
54 } else {
55 length = __libc_format_buffer(buf, buf_len, "Unknown error %d", error_number);
56 }
57 if (length >= buf_len) {
58 errno_restorer.override(ERANGE);
59 return -1;
60 }
61
62 return 0;
63 }
64
__strsignal(int signal_number,char * buf,size_t buf_len)65 extern "C" __LIBC_HIDDEN__ const char* __strsignal(int signal_number, char* buf, size_t buf_len) {
66 const char* signal_name = __strsignal_lookup(signal_number);
67 if (signal_name != NULL) {
68 return signal_name;
69 }
70
71 const char* prefix = "Unknown";
72 if (signal_number >= SIGRTMIN && signal_number <= SIGRTMAX) {
73 prefix = "Real-time";
74 signal_number -= SIGRTMIN;
75 }
76 size_t length = snprintf(buf, buf_len, "%s signal %d", prefix, signal_number);
77 if (length >= buf_len) {
78 return NULL;
79 }
80 return buf;
81 }
82