support.cc

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "support.h"

#pragma GCC optimize("no-tree-loop-distribute-patterns")

extern "C" {

int StringCopyN(char *dest, const char *src, int len)
{
    int i = 0;
    while (*src && len)
    {
        *dest++ = *src++;
        len--;
        i++;
    }
    *dest = '\0';
    return i;
}

int ByteSet(void *buf, int c, size_t len)
{
    size_t count = len;
    char *tmp = (char *) buf;
    while (len--)
    {
        *tmp++ = (char) c;
    }
    return count;
}

void MemoryCopy(void *dest, const void *src, size_t len)
{
    const unsigned char *sp = (const unsigned char *) src;
    unsigned char *dp = (unsigned char *) dest;
    for (; len != 0; len--)
        *dp++ = *sp++;
}

int StringCompare(const char *p1, const char *p2)
{
    int i = 0;
    int failed = 0;
    while (p1[i] != '\0' && p2[i] != '\0')
    {
        if (p1[i] != p2[i])
        {
            failed = 1;
            break;
        }
        i++;
    }
    // why did the loop exit?
    if ((p1[i] == '\0' && p2[i] != '\0') || (p1[i] != '\0' && p2[i] == '\0'))
        failed = 1;

    return failed;
}
}