gsasl  1.10.0
About: GNU SASL is an implementation of the Simple Authentication and Security Layer (SASL). Development version.
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strerror.c
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1 /* strerror.c --- POSIX compatible system error routine
2 
3  Copyright (C) 2007-2021 Free Software Foundation, Inc.
4 
5  This program is free software: you can redistribute it and/or modify
6  it under the terms of the GNU General Public License as published by
7  the Free Software Foundation; either version 3 of the License, or
8  (at your option) any later version.
9 
10  This program is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  GNU General Public License for more details.
14 
15  You should have received a copy of the GNU General Public License
16  along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 
18 #include <config.h>
19 
20 /* Specification. */
21 #include <string.h>
22 
23 #include <errno.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 
28 #include "intprops.h"
29 #include "strerror-override.h"
30 #include "verify.h"
31 
32 /* Use the system functions, not the gnulib overrides in this file. */
33 #undef sprintf
34 
35 char *
36 strerror (int n)
37 #undef strerror
38 {
39  static char buf[STACKBUF_LEN];
40  size_t len;
41 
42  /* Cast away const, due to the historical signature of strerror;
43  callers should not be modifying the string. */
44  const char *msg = strerror_override (n);
45  if (msg)
46  return (char *) msg;
47 
48  msg = strerror (n);
49 
50  /* Our strerror_r implementation might use the system's strerror
51  buffer, so all other clients of strerror have to see the error
52  copied into a buffer that we manage. This is not thread-safe,
53  even if the system strerror is, but portable programs shouldn't
54  be using strerror if they care about thread-safety. */
55  if (!msg || !*msg)
56  {
57  static char const fmt[] = "Unknown error %d";
58  verify (sizeof buf >= sizeof (fmt) + INT_STRLEN_BOUND (n));
59  sprintf (buf, fmt, n);
60  errno = EINVAL;
61  return buf;
62  }
63 
64  /* Fix STACKBUF_LEN if this ever aborts. */
65  len = strlen (msg);
66  if (sizeof buf <= len)
67  abort ();
68 
69  memcpy (buf, msg, len + 1);
70  return buf;
71 }
const char * msg
Definition: gai_strerror.c:53
#define INT_STRLEN_BOUND(t)
Definition: intprops.h:121
#define strerror_override(ignored)
#define STACKBUF_LEN
char * strerror(int n)
Definition: strerror.c:36
#define verify(R)
Definition: verify.h:289
char buf[4]
Definition: mbrtowc-impl.h:39