NetBSD/lib/libc/string/strerror.c

87 lines
2.9 KiB
C

/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)strerror.c 5.6 (Berkeley) 5/4/91";*/
static char *rcsid = "$Id: strerror.c,v 1.2 1993/10/09 00:11:01 jtc Exp $";
#endif /* LIBC_SCCS and not lint */
#include <string.h>
/*
* Since perror() is not allowed to change the contents of strerror()'s
* static buffer, both functions supply their own buffers to the
* internal function __strerror().
*/
char *
__strerror(num, buf)
int num;
char *buf;
{
#define UPREFIX "Unknown error: "
extern char *sys_errlist[];
extern int sys_nerr;
register unsigned int errnum;
register char *p, *t;
char tmp[40];
errnum = num; /* convert to unsigned */
if (errnum < sys_nerr)
return(sys_errlist[errnum]);
/* Do this by hand, so we don't include stdio(3). */
t = tmp;
do {
*t++ = "0123456789"[errnum % 10];
} while (errnum /= 10);
strcpy (buf, UPREFIX);
for (p = buf + sizeof(UPREFIX) -1;;) {
*p++ = *--t;
if (t <= tmp)
break;
}
return buf;
}
char *
strerror(num)
int num;
{
static char buf[40]; /* 64-bit number + slop */
return __strerror(num, buf);
}