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Annotation of Gnu-Mach/xen/ring.c, revision 1.1.1.1

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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