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1 /* |
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2 |
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3 Copyright (C) 1996, 1997, 1998, 2000, 2002, 2004, 2005, 2006, 2007 |
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4 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 3 of the License, or (at your |
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11 option) any later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, see |
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20 <http://www.gnu.org/licenses/>. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <new> |
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29 |
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30 #include "oct-alloc.h" |
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31 |
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32 void * |
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33 octave_allocator::alloc (size_t size) |
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34 { |
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35 if (size != item_size) |
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36 return ::new char [size]; |
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37 |
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38 if (! head) |
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39 { |
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40 if (! grow ()) |
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41 return 0; |
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42 } |
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43 |
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44 link *tmp = head; |
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45 head = head->next; |
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46 return tmp; |
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47 } |
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48 |
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49 // FIXME -- if we free the last item on the list, shouldn't we |
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50 // also free the underlying character array used for storage? |
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51 |
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52 void |
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53 octave_allocator::free (void *p, size_t size) |
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54 { |
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55 if (size != item_size) |
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56 ::delete [] (static_cast<char *> (p)); |
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57 else |
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58 { |
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59 link *tmp = static_cast<link *> (p); |
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60 tmp->next = head; |
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61 head = tmp; |
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62 } |
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63 } |
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64 |
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65 // Return TRUE for successful allocation, FALSE otherwise. |
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66 |
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67 bool |
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68 octave_allocator::grow (void) |
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69 { |
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70 bool retval = true; |
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71 |
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72 char *start = new char [grow_size * item_size]; |
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73 |
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74 if (start) |
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75 { |
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76 char *last = &start[(grow_size - 1) * item_size]; |
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77 |
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78 char *p = start; |
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79 while (p < last) |
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80 { |
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81 char *next = p + item_size; |
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82 (reinterpret_cast<link *> (p)) -> next |
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83 = reinterpret_cast<link *> (next); |
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84 p = next; |
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85 } |
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86 |
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87 (reinterpret_cast<link *> (last)) -> next = 0; |
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88 |
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89 head = reinterpret_cast<link *> (start); |
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90 } |
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91 else |
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92 { |
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93 typedef void (*error_handler_function) (void); |
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94 |
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95 error_handler_function f = std::set_new_handler (0); |
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96 std::set_new_handler (f); |
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97 |
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98 if (f) |
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99 f (); |
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100 |
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101 retval = false; |
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102 } |
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103 |
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104 return retval; |
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105 } |
