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