snprintf.c

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/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2002
 *      Sleepycat Software.  All rights reserved.
 */

#include "db_config.h"

#ifndef lint
static const char revid[] = "$Id: snprintf.c,v 11.10 2002/01/11 15:51:28 bostic Exp $";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <stdio.h>
#endif

#include "db_int.h"

/*
 * snprintf --
 *      Bounded version of sprintf.
 *
 * PUBLIC: #ifndef HAVE_SNPRINTF
 * PUBLIC: int snprintf __P((char *, size_t, const char *, ...));
 * PUBLIC: #endif
 */
#ifndef HAVE_SNPRINTF
int
#ifdef __STDC__
snprintf(char *str, size_t n, const char *fmt, ...)
#else
snprintf(str, n, fmt, va_alist)
        char *str;
        size_t n;
        const char *fmt;
        va_dcl
#endif
{
        static int ret_charpnt = -1;
        va_list ap;
        int len;

        COMPQUIET(n, 0);

        /*
         * Some old versions of sprintf return a pointer to the first argument
         * instead of a character count.  Assume the return value of snprintf,
         * vsprintf, etc. will be the same as sprintf, and check the easy one.
         *
         * We do this test at run-time because it's not a test we can do in a
         * cross-compilation environment.
         */
        if (ret_charpnt == -1) {
                char buf[10];

                ret_charpnt =
                    sprintf(buf, "123") != 3 ||
                    sprintf(buf, "123456789") != 9 ||
                    sprintf(buf, "1234") != 4;
        }

#ifdef __STDC__
        va_start(ap, fmt);
#else
        va_start(ap);
#endif
        len = vsprintf(str, fmt, ap);
        va_end(ap);
        return (ret_charpnt ? (int)strlen(str) : len);
}
#endif

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