/* Copyright (C) 1991-2015 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <libintl.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/param.h> #include <_itoa.h> /* It is critical here that we always use the `dcgettext' function for the message translation. Since <libintl.h> only defines the macro `dgettext' to use `dcgettext' for optimizing programs this is not always guaranteed. */ #ifndef dgettext # include <locale.h> /* We need LC_MESSAGES. */ # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES) #endif /* Return a string describing the errno code in ERRNUM. */ char * __strerror_r (int errnum, char *buf, size_t buflen) { if (__builtin_expect (errnum < 0 || errnum >= _sys_nerr_internal || _sys_errlist_internal[errnum] == NULL, 0)) { /* Buffer we use to print the number in. For a maximum size for `int' of 8 bytes we never need more than 20 digits. */ char numbuf[21]; const char *unk = _("Unknown error "); size_t unklen = strlen (unk); char *p, *q; bool negative = errnum < 0; numbuf[20] = '\0'; p = _itoa_word (abs (errnum), &numbuf[20], 10, 0); /* Now construct the result while taking care for the destination buffer size. */ q = __mempcpy (buf, unk, MIN (unklen, buflen)); if (negative && unklen < buflen) { *q++ = '-'; ++unklen; } if (unklen < buflen) memcpy (q, p, MIN ((size_t) (&numbuf[21] - p), buflen - unklen)); /* Terminate the string in any case. */ if (buflen > 0) buf[buflen - 1] = '\0'; return buf; } return (char *) _(_sys_errlist_internal[errnum]); } weak_alias (__strerror_r, strerror_r) libc_hidden_def (__strerror_r)