/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#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_strdup(const char *str)
{
        char *buf = NULL;

        if (str != NULL) {
                size_t sz;

                sz = strlen(str) + 1;
                buf = uu_zalloc(sz);
                if (buf != NULL)
                        (void) memcpy(buf, str, sz);
        }
        return (buf);
}

/*
 * Duplicate up to n bytes of a string.  Kind of sort of like
 * strdup(strlcpy(s, n)).
 */
char *
uu_strndup(const char *s, size_t n)
{
        size_t len;
        char *p;

        len = strnlen(s, n);
        p = uu_zalloc(len + 1);
        if (p == NULL)
                return (NULL);

        if (len > 0)
                (void) memcpy(p, s, len);
        p[len] = '\0';

        return (p);
}

/*
 * Duplicate a block of memory.  Combines malloc with memcpy, much as
 * strdup combines malloc, strlen, and strcpy.
 */
void *
uu_memdup(const void *buf, size_t sz)
{
        void *p;

        p = uu_zalloc(sz);
        if (p == NULL)
                return (NULL);
        (void) memcpy(p, buf, sz);
        return (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);
}