memset_s.c

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/*------------------------------------------------------------------
 * memset_s
 *
 * October 2008, Bo Berry
 * Copyright (c) 2017 Reini Urban
 *
 * Copyright (c) 2008-2011 Cisco Systems
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *------------------------------------------------------------------
 */

#include "safeclib_private.h"
#include "safe_mem_constraint.h"
#include "mem_primitives_lib.h"
#include "safe_mem_lib.h"


#if !(defined(__STDC_WANT_LIB_EXT1__) && (__STDC_WANT_LIB_EXT1__ >= 1))
errno_t
memset_s (void *dest, rsize_t dmax, uint8_t value, rsize_t n)
{
    errno_t err = EOK;

    if (dest == NULL) {
        invoke_safe_mem_constraint_handler("memset_s: dest is null",
                   NULL, ESNULLP);
        return (RCNEGATE(ESNULLP));
    }

    /* different on C11! */
    if (n == 0) {
        invoke_safe_mem_constraint_handler("memset_s: n is 0",
                   NULL, ESZEROL);
        return (RCNEGATE(ESZEROL));
    }

    if (dmax > RSIZE_MAX_MEM) {
        invoke_safe_mem_constraint_handler("memset_s: dmax exceeds max",
                   NULL, ESLEMAX);
        return (RCNEGATE(ESLEMAX));
    }

    if (n > RSIZE_MAX_MEM) {
        invoke_safe_mem_constraint_handler("memset_s: n exceeds max",
                   NULL, ESLEMAX);
        err = ESLEMAX;
        n = dmax;
    }

    if (n > dmax) {
        invoke_safe_mem_constraint_handler("memset_s: n exceeds dmax",
                   NULL, ESNOSPC);
        err = ESNOSPC;
        n = dmax;
    }

    mem_prim_set(dest, n, value);

    return (RCNEGATE(err));
}
EXPORT_SYMBOL(memset_s)
#endif