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