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75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <libintl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/param.h>
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#include <_itoa.h>
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/* It is critical here that we always use the `dcgettext' function for
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the message translation. Since <libintl.h> only defines the macro
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`dgettext' to use `dcgettext' for optimizing programs this is not
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always guaranteed. */
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#ifndef dgettext
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# include <locale.h> /* We need LC_MESSAGES. */
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# define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
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#endif
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/* Return a string describing the errno code in ERRNUM. */
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char *
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__strerror_r (int errnum, char *buf, size_t buflen)
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{
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if (__builtin_expect (errnum < 0 || errnum >= _sys_nerr_internal
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|| _sys_errlist_internal[errnum] == NULL, 0))
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{
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/* Buffer we use to print the number in. For a maximum size for
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`int' of 8 bytes we never need more than 20 digits. */
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char numbuf[21];
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const char *unk = _("Unknown error ");
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size_t unklen = strlen (unk);
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char *p, *q;
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bool negative = errnum < 0;
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numbuf[20] = '\0';
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p = _itoa_word (abs (errnum), &numbuf[20], 10, 0);
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/* Now construct the result while taking care for the destination
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buffer size. */
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q = __mempcpy (buf, unk, MIN (unklen, buflen));
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if (negative && unklen < buflen)
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{
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*q++ = '-';
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++unklen;
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}
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if (unklen < buflen)
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memcpy (q, p, MIN ((size_t) (&numbuf[21] - p), buflen - unklen));
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/* Terminate the string in any case. */
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if (buflen > 0)
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buf[buflen - 1] = '\0';
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return buf;
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}
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return (char *) _(_sys_errlist_internal[errnum]);
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}
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weak_alias (__strerror_r, strerror_r)
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libc_hidden_def (__strerror_r)
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