strerror2.c

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/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997, 1998, 1999
 *      Sleepycat Software.  All rights reserved.
 */
/*
 * Copyright (c) 1988, 1993
 *      The 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. 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */

#ifndef HAVE_STRERROR

/*
 * strerror --
 *      Return the string associated with an errno.
 *
 * PUBLIC: #ifndef HAVE_STRERROR
 * PUBLIC: char *strerror __P((int));
 * PUBLIC: #endif
 */
char *
strerror(num)
        int num;
{
        extern int sys_nerr;
        extern char *sys_errlist[];
#undef  UPREFIX
#define UPREFIX "Unknown error: "
        static char ebuf[40] = UPREFIX;         /* 64-bit number + slop */
        int errnum;
        char *p, *t, 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);
        for (p = ebuf + sizeof(UPREFIX) - 1;;) {
                *p++ = *--t;
                if (t <= tmp)
                        break;
        }
        return(ebuf);
}

#endif /* HAVE_STRERROR */

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