1 /* strerror.c --- POSIX compatible system error routine
3 Copyright (C) 2007-2024 Free Software Foundation, Inc.
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
10 This file 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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
29 #include "strerror-override.h"
31 /* Use the system functions, not the gnulib overrides in this file. */
38 static char buf
[STACKBUF_LEN
];
41 /* Cast away const, due to the historical signature of strerror;
42 callers should not be modifying the string. */
43 const char *msg
= strerror_override (n
);
49 /* Our strerror_r implementation might use the system's strerror
50 buffer, so all other clients of strerror have to see the error
51 copied into a buffer that we manage. This is not thread-safe,
52 even if the system strerror is, but portable programs shouldn't
53 be using strerror if they care about thread-safety. */
56 static char const fmt
[] = "Unknown error %d";
57 static_assert (sizeof buf
>= sizeof (fmt
) + INT_STRLEN_BOUND (n
));
58 sprintf (buf
, fmt
, n
);
63 /* Fix STACKBUF_LEN if this ever aborts. */
65 if (sizeof buf
<= len
)
68 memcpy (buf
, msg
, len
+ 1);