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Annotation of Gnu-Mach/xen/ring.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *  Copyright (C) 2006-2009 Free Software Foundation
        !             3:  *
        !             4:  * This program is free software ; you can redistribute it and/or modify
        !             5:  * it under the terms of the GNU General Public License as published by
        !             6:  * the Free Software Foundation ; either version 2 of the License, or
        !             7:  * (at your option) any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful,
        !            10:  * but WITHOUT ANY WARRANTY ; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
        !            12:  * GNU General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with the program ; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: #include <sys/types.h>
        !            20: #include <string.h>
        !            21: #include "ring.h"
        !            22: 
        !            23: /* dest is ring */
        !            24: void hyp_ring_store(void *dest, const void *src, size_t size, void *start, void *end)
        !            25: {
        !            26:        if (dest + size > end) {
        !            27:                size_t first_size = end - dest;
        !            28:                memcpy(dest, src, first_size);
        !            29:                src += first_size;
        !            30:                dest = start;
        !            31:                size -= first_size;
        !            32:        }
        !            33:        memcpy(dest, src, size);
        !            34: }
        !            35: 
        !            36: /* src is ring */
        !            37: void hyp_ring_fetch(void *dest, const void *src, size_t size, void *start, void *end)
        !            38: {
        !            39:        if (src + size > end) {
        !            40:                size_t first_size = end - src;
        !            41:                memcpy(dest, src, first_size);
        !            42:                dest += first_size;
        !            43:                src = start;
        !            44:                size -= first_size;
        !            45:        }
        !            46:        memcpy(dest, src, size);
        !            47: }
        !            48: 
        !            49: size_t hyp_ring_next_word(char **c, void *start, void *end)
        !            50: {
        !            51:        size_t n = 0;
        !            52: 
        !            53:        while (**c) {
        !            54:                n++;
        !            55:                if (++(*c) == end)
        !            56:                        *c = start;
        !            57:        }
        !            58:        (*c)++;
        !            59: 
        !            60:        return n;
        !            61: }

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