cpukit/libdebugger/rtems-debugger-block.c

0001 /*
0002  * Copyright (c) 2016 Chris Johns <chrisj@rtems.org>.
0003  * All rights reserved.
0004  *
0005  * Redistribution and use in source and binary forms, with or without
0006  * modification, are permitted provided that the following conditions
0007  * are met:
0008  * 1. Redistributions of source code must retain the above copyright
0009  *    notice, this list of conditions and the following disclaimer.
0010  * 2. Redistributions in binary form must reproduce the above copyright
0011  *    notice, this list of conditions and the following disclaimer in the
0012  *    documentation and/or other materials provided with the distribution.
0013  *
0014  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
0015  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0016  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0017  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
0018  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
0019  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
0020  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
0021  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
0022  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
0023  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
0024  * SUCH DAMAGE.
0025  */
0026
0027 #include <errno.h>
0028 #include <stdlib.h>
0029
0030 #include "rtems-debugger-block.h"
0031
0032 int
0033 rtems_debugger_block_create(rtems_debugger_block* block,
0034                             size_t                step,
0035                             size_t                size)
0036 {
0037   int r = 0;
0038   block->level = 0;
0039   block->step = step;
0040   block->count = step;
0041   block->size = size;
0042   block->block = calloc(block->count, block->size);
0043   if (block->block == NULL)
0044     errno = ENOMEM;
0045   return r;
0046 }
0047
0048 int
0049 rtems_debugger_block_destroy(rtems_debugger_block* block)
0050 {
0051   free(block->block);
0052   block->block = NULL;
0053   block->level = 0;
0054   block->count = 0;
0055   block->size = 0;
0056   return 0;
0057 }
0058
0059 int
0060 rtems_debugger_block_resize(rtems_debugger_block* block)
0061 {
0062   int r = 0;
0063   if (block->level >= block->count) {
0064     block->count += block->step;
0065     block->block = realloc(block->block, block->count * block->size);
0066     if (block->block == NULL) {
0067       block->level = 0;
0068       block->count = 0;
0069       errno = ENOMEM;
0070       r = -1;
0071     }
0072   }
0073   return r;
0074 }