mirror of
https://github.com/freebsd/freebsd-src
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0957b409a9
Disabled by default, used by loader and sbin/veriexec Reviewed by: emaste Sponsored by: Juniper Networks Differential Revision: D16334
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "brssl.h"
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/*
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* Prepare a vector buffer for adding 'extra' elements.
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* buf current buffer
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* esize size of a vector element
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* ptr pointer to the 'ptr' vector field
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* len pointer to the 'len' vector field
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* extra number of elements to add
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*
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* If the buffer must be enlarged, then this function allocates the new
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* buffer and releases the old one. The new buffer address is then returned.
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* If the buffer needs not be enlarged, then the buffer address is returned.
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*
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* In case of enlargement, the 'len' field is adjusted accordingly. The
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* 'ptr' field is not modified.
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*/
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void *
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vector_expand(void *buf,
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size_t esize, size_t *ptr, size_t *len, size_t extra)
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{
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size_t nlen;
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void *nbuf;
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if (*len - *ptr >= extra) {
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return buf;
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}
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nlen = (*len << 1);
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if (nlen - *ptr < extra) {
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nlen = extra + *ptr;
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if (nlen < 8) {
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nlen = 8;
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}
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}
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nbuf = xmalloc(nlen * esize);
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if (buf != NULL) {
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memcpy(nbuf, buf, *len * esize);
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xfree(buf);
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}
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*len = nlen;
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return nbuf;
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}
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