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118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* BIRD -- Set/Community-list Operations
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*
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* (c) 2000 Martin Mares <mj@ucw.cz>
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* (c) 2000 Pavel Machek <pavel@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "nest/bird.h"
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#include "nest/route.h"
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#include "nest/attrs.h"
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#include "lib/resource.h"
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#include "lib/string.h"
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/**
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* int_set_format - format an &set for printing
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* @set: set attribute to be formatted
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* @way: style of format (0 for router ID list, 1 for community list)
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* @from: starting position in set
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* @buf: destination buffer
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* @size: size of buffer
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*
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* This function takes a set attribute and formats it. @way specifies
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* the style of format (router ID / community). @from argument can be
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* used to specify the first printed value for the purpose of printing
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* untruncated sets even with smaller buffers. If the output fits in
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* the buffer, 0 is returned, otherwise the position of the first not
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* printed item is returned. This value can be used as @from argument
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* in subsequent calls. If truncated output suffices, -1 can be
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* instead used as @from, in that case " ..." is eventually added at
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* the buffer to indicate truncation.
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*/
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int
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int_set_format(struct adata *set, int way, int from, byte *buf, unsigned int size)
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{
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u32 *z = (u32 *) set->data;
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byte *end = buf + size - 24;
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int to = set->length / 4;
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int i;
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for (i = MAX(from, 0); i < to; i++)
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{
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if (buf > end)
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{
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if (from < 0)
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strcpy(buf, " ...");
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else
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*buf = 0;
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return i;
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}
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if (i > from)
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*buf++ = ' ';
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if (way)
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buf += bsprintf(buf, "(%d,%d)", z[i] >> 16, z[i] & 0xffff);
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else
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buf += bsprintf(buf, "%R", z[i]);
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}
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*buf = 0;
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return 0;
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}
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int
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int_set_contains(struct adata *list, u32 val)
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{
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if (!list)
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return 0;
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u32 *l = (u32 *) list->data;
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unsigned int i;
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for (i=0; i<list->length/4; i++)
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if (*l++ == val)
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return 1;
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return 0;
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}
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struct adata *
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int_set_add(struct linpool *pool, struct adata *list, u32 val)
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{
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struct adata *res;
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int len;
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if (int_set_contains(list, val))
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return list;
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len = list ? list->length : 0;
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res = lp_alloc(pool, len + sizeof(struct adata) + 4);
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res->length = len + 4;
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* (u32 *) res->data = val;
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if (list)
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memcpy((char *) res->data + 4, list->data, list->length);
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return res;
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}
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struct adata *
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int_set_del(struct linpool *pool, struct adata *list, u32 val)
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{
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struct adata *res;
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u32 *l, *k;
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unsigned int i;
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if (!int_set_contains(list, val))
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return list;
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res = lp_alloc(pool, list->length + sizeof(struct adata) - 4);
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res->length = list->length-4;
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l = (u32 *) list->data;
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k = (u32 *) res->data;
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for (i=0; i<list->length/4; i++)
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if (l[i] != val)
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*k++ = l[i];
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return res;
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}
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