libuutil/common/uu_alloc.c

/*
 * 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);
}