1 /** 2 * @file op_growable_buffer.c 3 * a growable buffer implementation 4 * 5 * @remark Copyright 2007 OProfile authors 6 * @remark Read the file COPYING 7 * 8 * @author Philippe Elie 9 */ 10 11 #include "op_growable_buffer.h" 12 #include "op_libiberty.h" 13 14 #include <string.h> 15 #include <stdlib.h> 16 17 void init_buffer(struct growable_buffer * b) 18 { 19 b->max_size = 0; 20 b->size = 0; 21 b->p = NULL; 22 } 23 24 25 void free_buffer(struct growable_buffer * b) 26 { 27 free(b->p); 28 } 29 30 31 static void grow_buffer(struct growable_buffer * b) 32 { 33 size_t new_size = (b->max_size + b->size) * 2; 34 b->p = xrealloc(b->p, new_size); 35 b->max_size = new_size; 36 } 37 38 39 void add_data(struct growable_buffer * b, void const * data, size_t len) 40 { 41 size_t old_size = b->size; 42 b->size += len; 43 if (b->size > b->max_size) 44 grow_buffer(b); 45 memcpy(b->p + old_size, data, len); 46 } 47
