mirror of
https://github.com/jart/cosmopolitan.git
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69 lines
3.1 KiB
C
69 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=8 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "ape/sections.internal.h"
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#include "libc/assert.h"
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#include "libc/fmt/conv.h"
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#include "libc/macros.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdckdint.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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/* TODO(jart): DELETE */
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#define GUARANTEE_TERMINATOR 1
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#define INITIAL_CAPACITY (32 - GUARANTEE_TERMINATOR)
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static bool isheap(const void *p) {
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if (__executable_start <= (const unsigned char *)p &&
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(const unsigned char *)p < _end)
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return false;
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return true;
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}
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bool __grow(void *pp, size_t *capacity, size_t itemsize, size_t extra) {
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void **p, *p1, *p2;
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size_t n1, n2;
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size_t t1, t2;
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extra += GUARANTEE_TERMINATOR;
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p = (void **)pp;
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unassert(itemsize);
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unassert((*p && *capacity) || (!*p && !*capacity));
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unassert(!isheap(*p) || ((intptr_t)*p & 15) == 0);
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p1 = isheap(*p) ? *p : NULL;
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p2 = NULL;
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n1 = *capacity;
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n2 = (*p ? n1 + (n1 >> 1) : MAX(4, INITIAL_CAPACITY / itemsize)) + extra;
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if (!ckd_mul(&t1, n1, itemsize) && !ckd_mul(&t2, n2, itemsize)) {
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if ((p2 = realloc(p1, ROUNDUP(t2, 32)))) {
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if (!p1 && *p)
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memcpy(p2, *p, t1);
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bzero((char *)p2 + t1, t2 - t1);
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*capacity = n2;
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*p = p2;
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return true;
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} else {
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enomem();
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}
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} else {
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eoverflow();
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}
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return false;
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}
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