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87b7292aa5
drgn is currently licensed as GPLv3+. Part of the long term vision for drgn is that other projects can use it as a library providing programmatic interfaces for debugger functionality. A more permissive license is better suited to this goal. We decided on LGPLv2.1+ as a good balance between software freedom and permissiveness. All contributors not employed by Meta were contacted via email and consented to the license change. The only exception was the author of commitc4fbf7e589("libdrgn: fix for compilation error"), who did not respond. That commit reverted a single line of code to one originally written by me in commit640b1c011d("libdrgn: embed DWARF index in DWARF info cache"). Signed-off-by: Omar Sandoval <osandov@osandov.com>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: LGPL-2.1-or-later
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#include "vector.h"
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bool vector_do_reserve(size_t new_capacity, size_t entry_size, void **data,
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size_t *capacity)
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{
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size_t bytes;
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void *new_data;
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if (new_capacity <= *capacity || new_capacity == 0)
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return true;
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if (__builtin_mul_overflow(new_capacity, entry_size, &bytes))
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return false;
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new_data = realloc(*data, bytes);
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if (!new_data)
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return false;
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*data = new_data;
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*capacity = new_capacity;
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return true;
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}
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void vector_do_shrink_to_fit(size_t size, size_t entry_size, void **data,
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size_t *capacity)
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{
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if (*capacity > size) {
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if (size > 0) {
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/*
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* We already have at least size * entry_size bytes
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* allocated, so we don't need to worry about overflow.
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*/
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void *new_data = realloc(*data, size * entry_size);
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if (new_data) {
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*data = new_data;
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*capacity = size;
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}
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} else {
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free(*data);
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*data = NULL;
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*capacity = 0;
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}
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}
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}
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bool vector_reserve_for_append(size_t size, size_t entry_size, void **data,
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size_t *capacity)
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{
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size_t new_capacity, bytes;
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void *new_data;
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if (size < *capacity)
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return true;
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if (*capacity == 0)
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new_capacity = 1;
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else if (__builtin_mul_overflow(2U, *capacity, &new_capacity))
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return false;
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if (__builtin_mul_overflow(new_capacity, entry_size, &bytes))
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return false;
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new_data = realloc(*data, bytes);
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if (!new_data)
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return false;
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*data = new_data;
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*capacity = new_capacity;
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return true;
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}
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