mirror of git://sourceware.org/git/glibc.git
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
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/* Copyright (C) 1991 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <stdio.h>
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#include <string.h>
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/* Defined in stdio/sys_errlist.c. */
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extern CONST char *CONST _sys_errlist[];
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extern CONST int _sys_nerr;
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/* Return a string descibing the errno code in ERRNUM.
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The storage is good only until the next call to strerror.
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Writing to the storage causes undefined behavior. */
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char *
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DEFUN(strerror, (errnum), int errnum)
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{
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if (errnum < 0 || errnum > _sys_nerr)
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{
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static char unknown_error[] = "Unknown error 000000000000000000";
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static char fmt[] = "Unknown error %d";
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size_t len = sprintf(unknown_error, fmt, errnum);
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if (len < sizeof(fmt) - 2)
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return NULL;
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unknown_error[len - 1] = '\0';
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return unknown_error;
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}
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return (char *) _sys_errlist[errnum];
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}
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