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/* ----------------------------------------------------------------------- *
*
* Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* syslinux/getadv.c
*
* Get a data item from the auxilliary data vector. Returns a pointer
* and sets *size on success; NULL on failure.
*/
#include <syslinux/adv.h>
#include <klibc/compiler.h>
#include <inttypes.h>
const void *syslinux_getadv(int tag, size_t *size)
{
const uint8_t *p;
size_t left, len;
p = syslinux_adv_ptr();
left = syslinux_adv_size();
while (left >= 2) {
uint8_t ptag = *p++;
size_t plen = *p++;
left -= 2;
if (ptag == ADV_END)
return NULL; /* Not found */
if (left < plen)
return NULL; /* Item overrun */
if (ptag == tag) {
*size = plen;
return p;
}
p += plen;
left -= plen;
}
return NULL;
}
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