| 1 | /* strerror.c --- POSIX compatible system error routine
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| 2 |
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| 3 | Copyright (C) 2007-2012 Free Software Foundation, Inc.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | #include <config.h>
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| 19 |
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| 20 | /* Specification. */
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| 21 | #include <string.h>
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| 22 |
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| 23 | #include <errno.h>
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| 24 | #include <stdio.h>
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| 25 | #include <stdlib.h>
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| 26 | #include <string.h>
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| 27 |
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| 28 | #include "intprops.h"
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| 29 | #include "strerror-override.h"
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| 30 | #include "verify.h"
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| 31 |
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| 32 | /* Use the system functions, not the gnulib overrides in this file. */
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| 33 | #undef sprintf
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| 34 |
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| 35 | char *
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| 36 | strerror (int n)
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| 37 | #undef strerror
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| 38 | {
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| 39 | static char buf[STACKBUF_LEN];
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| 40 | size_t len;
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| 41 |
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| 42 | /* Cast away const, due to the historical signature of strerror;
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| 43 | callers should not be modifying the string. */
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| 44 | const char *msg = strerror_override (n);
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| 45 | if (msg)
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| 46 | return (char *) msg;
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| 47 |
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| 48 | msg = strerror (n);
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| 49 |
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| 50 | /* Our strerror_r implementation might use the system's strerror
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| 51 | buffer, so all other clients of strerror have to see the error
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| 52 | copied into a buffer that we manage. This is not thread-safe,
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| 53 | even if the system strerror is, but portable programs shouldn't
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| 54 | be using strerror if they care about thread-safety. */
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| 55 | if (!msg || !*msg)
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| 56 | {
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| 57 | static char const fmt[] = "Unknown error %d";
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| 58 | verify (sizeof buf >= sizeof (fmt) + INT_STRLEN_BOUND (n));
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| 59 | sprintf (buf, fmt, n);
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| 60 | errno = EINVAL;
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| 61 | return buf;
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| 62 | }
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| 63 |
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| 64 | /* Fix STACKBUF_LEN if this ever aborts. */
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| 65 | len = strlen (msg);
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| 66 | if (sizeof buf <= len)
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| 67 | abort ();
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| 68 |
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| 69 | return memcpy (buf, msg, len + 1);
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| 70 | }
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