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annotate lib/strerror.c @ 4739:04758f7475fd

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Merge changes from glibc.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 26 Sep 2003 07:35:01 +0000
parents e9cc723f9777
children a48fb0e98c8c
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1 /* strerror.c --- ANSI C compatible system error routine
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2
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3 Copyright (C) 1986, 1988, 1989, 1991, 2002, 2003 Free Software
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4 Foundation, Inc.
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; if not, write to the Free Software Foundation,
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18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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20 #if HAVE_CONFIG_H
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21 # include <config.h>
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22 #endif
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23
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24 #include <limits.h>
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25
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26 /* Don't include <stdio.h>, since it may or may not declare
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27 sys_errlist and its declarations may collide with ours. Just
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28 declare the stuff that we need directly. Standard hosted C89
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29 implementations define strerror and they don't need this strerror
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30 function, so take some liberties with the standard to cater to
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31 ancient or limited freestanding implementations. */
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32 int sprintf (char *, char const *, ...);
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33 extern int sys_nerr;
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34 extern char *sys_errlist[];
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35
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36 char *
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37 strerror (int n)
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38 {
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39 static char const fmt[] = "Unknown error (%d)";
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40 static char mesg[sizeof fmt + sizeof n * CHAR_BIT / 3];
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41
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42 if (n < 0 || n >= sys_nerr)
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43 {
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44 sprintf (mesg, fmt, n);
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45 return mesg;
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46 }
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47 else
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48 return sys_errlist[n];
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49 }