mirror of
https://github.com/janet-lang/janet
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333ae7c4f8
This way we can support fewer build configurations. Also, remove all undefined behavior due to use of memcpy with NULL pointers. GCC was exploiting this to remove NULL checks in some builds.
55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
/*
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* Copyright (c) 2020 Calvin Rose
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef JANET_AMALG
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#include "features.h"
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#include "vector.h"
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#include "util.h"
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#endif
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/* Grow the buffer dynamically. Used for push operations. */
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void *janet_v_grow(void *v, int32_t increment, int32_t itemsize) {
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int32_t dbl_cur = (NULL != v) ? 2 * janet_v__cap(v) : 0;
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int32_t min_needed = janet_v_count(v) + increment;
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int32_t m = dbl_cur > min_needed ? dbl_cur : min_needed;
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size_t newsize = ((size_t) itemsize) * m + sizeof(int32_t) * 2;
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int32_t *p = (int32_t *) janet_srealloc(v ? janet_v__raw(v) : 0, newsize);
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if (!v) p[1] = 0;
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p[0] = m;
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return p + 2;
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}
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/* Convert a buffer to normal allocated memory (forget capacity) */
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void *janet_v_flattenmem(void *v, int32_t itemsize) {
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int32_t *p;
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if (NULL == v) return NULL;
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size_t size = (size_t) itemsize * janet_v__cnt(v);
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p = malloc(size);
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if (NULL != p) {
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safe_memcpy(p, v, size);
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return p;
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} else {
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JANET_OUT_OF_MEMORY;
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}
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}
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