75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2015.
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This file is part of Sortix libmount.
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Sortix libmount is free software: you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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Sortix libmount is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with Sortix libmount. If not, see <http://www.gnu.org/licenses/>.
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util.h
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Utility functions.
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*******************************************************************************/
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#ifndef UTIL_H
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#define UTIL_H
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#include <string.h>
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#include <stdlib.h>
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#define MALLOC_TYPE(type) (type*) malloc(sizeof(type))
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#define CALLOC_TYPE(type) (type*) calloc(1, sizeof(type))
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__attribute__((unused))
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static bool memiszero(const void* mem, size_t size)
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{
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const unsigned char* buf = (const unsigned char*) mem;
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for ( size_t i = 0; i < size; i++ )
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if ( buf[i] )
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return false;
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return true;
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}
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__attribute__((unused))
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static bool array_add(void*** array_ptr,
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size_t* used_ptr,
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size_t* length_ptr,
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void* value)
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{
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void** array;
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memcpy(&array, array_ptr, sizeof(array)); // Strict aliasing.
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if ( *used_ptr == *length_ptr )
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{
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// TODO: Avoid overflow.
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size_t new_length = 2 * *length_ptr;
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if ( !new_length )
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new_length = 16;
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// TODO: Avoid overflow and use reallocarray.
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size_t new_size = new_length * sizeof(void*);
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void** new_array = (void**) realloc(array, new_size);
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if ( !new_array )
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return false;
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array = new_array;
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memcpy(array_ptr, &array, sizeof(array)); // Strict aliasing.
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*length_ptr = new_length;
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}
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memcpy(array + (*used_ptr)++, &value, sizeof(value)); // Strict aliasing.
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return true;
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}
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#endif
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