libuutil/common/uu_alloc.c

	uu_alloc.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "libuutil_common.h"

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void *
uu_zalloc(size_t n)
{
    void *p = malloc(n);

    if (p == NULL) {
        uu_set_error(UU_ERROR_SYSTEM);
        return (NULL);
    }

    (void) memset(p, 0, n);

    return (p);
}

void
uu_free(void *p)
{
    free(p);
}

char *
uu_msprintf(const char *format, ...)
{
    va_list args;
    char attic[1];
    uint_t M, m;
    char *b;

    va_start(args, format);
    M = vsnprintf(attic, 1, format, args);
    va_end(args);

    for (;;) {
        m = M;
        if ((b = uu_zalloc(m + 1)) == NULL)
            return (NULL);

        va_start(args, format);
        M = vsnprintf(b, m + 1, format, args);
        va_end(args);

        if (M == m)
            break;      /* sizes match */

        uu_free(b);
    }

    return (b);
}