src/ucx/stack.c

Wed, 28 Oct 2015 17:59:34 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 28 Oct 2015 17:59:34 +0100
changeset 105
63d9051fe35c
parent 99
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child 135
471e28cca288
permissions
-rw-r--r--

using readdir_r instead of readdir

99
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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2015 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "stack.h"
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30 #include <string.h>
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31
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32 static size_t ucx_stack_align(size_t n) {
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33 int align = n % sizeof(void*);
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34 if (align) {
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35 n += sizeof(void*) - align;
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36 }
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37 return n;
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38 }
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39
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40 void ucx_stack_init(UcxStack *stack, char* space, size_t size) {
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41 stack->size = size - size % sizeof(void*);
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42 stack->space = space;
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43 stack->top = NULL;
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44
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45 stack->allocator.pool = stack;
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46 stack->allocator.malloc = (ucx_allocator_malloc) ucx_stack_malloc;
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47 stack->allocator.calloc = (ucx_allocator_calloc) ucx_stack_calloc;
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48 stack->allocator.realloc = (ucx_allocator_realloc) ucx_stack_realloc;
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49 stack->allocator.free = (ucx_allocator_free) ucx_stack_free;
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50 }
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51
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52 void *ucx_stack_malloc(UcxStack *stack, size_t n) {
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53
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54 if (ucx_stack_avail(stack) < ucx_stack_align(n)) {
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55 return NULL;
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56 } else {
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57 char *prev = stack->top;
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58 if (stack->top) {
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59 stack->top += ucx_stack_align(ucx_stack_topsize(stack));
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60 } else {
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61 stack->top = stack->space;
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62 }
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63
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64 ((struct ucx_stack_metadata*)stack->top)->prev = prev;
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65 ((struct ucx_stack_metadata*)stack->top)->size = n;
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66 stack->top += sizeof(struct ucx_stack_metadata);
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67
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68 return stack->top;
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69 }
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70 }
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71
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72 void *ucx_stack_calloc(UcxStack *stack, size_t nelem, size_t elsize) {
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73 void *mem = ucx_stack_malloc(stack, nelem*elsize);
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74 memset(mem, 0, nelem*elsize);
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75 return mem;
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76 }
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77
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78 void *ucx_stack_realloc(UcxStack *stack, void *ptr, size_t n) {
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79 if (ptr == stack->top) {
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80 if (stack->size - (stack->top - stack->space) < ucx_stack_align(n)) {
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81 return NULL;
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82 } else {
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83 ((struct ucx_stack_metadata*)stack->top - 1)->size = n;
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84 return ptr;
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85 }
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86 } else {
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87 if (ucx_stack_align(((struct ucx_stack_metadata*)ptr - 1)->size) <
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88 ucx_stack_align(n)) {
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89 void *nptr = ucx_stack_malloc(stack, n);
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90 if (nptr) {
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91 memcpy(nptr, ptr, n);
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92 ucx_stack_free(stack, ptr);
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93
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94 return nptr;
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95 } else {
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96 return NULL;
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97 }
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98 } else {
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99 ((struct ucx_stack_metadata*)ptr - 1)->size = n;
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100 return ptr;
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101 }
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102 }
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103 }
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104
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105 void ucx_stack_free(UcxStack *stack, void *ptr) {
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106 if (ptr == stack->top) {
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107 stack->top = ((struct ucx_stack_metadata*) stack->top - 1)->prev;
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108 } else {
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109 struct ucx_stack_metadata *next = (struct ucx_stack_metadata*)(
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110 (char*)ptr +
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111 ucx_stack_align(((struct ucx_stack_metadata*) ptr - 1)->size)
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112 );
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113 next->prev = ((struct ucx_stack_metadata*) ptr - 1)->prev;
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114 }
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115 }
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116
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117 void ucx_stack_popn(UcxStack *stack, void *dest, size_t n) {
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118 if (ucx_stack_empty(stack)) {
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119 return;
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120 }
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121
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122 size_t len = ucx_stack_topsize(stack);
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123 if (len > n) {
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124 len = n;
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125 }
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126
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127 memcpy(dest, stack->top, len);
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128
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129 ucx_stack_free(stack, stack->top);
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130 }
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131
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132 size_t ucx_stack_avail(UcxStack *stack) {
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133 size_t avail = ((stack->top ? (stack->size
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134 - (stack->top - stack->space)
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135 - ucx_stack_align(ucx_stack_topsize(stack)))
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136 : stack->size));
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137
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138 if (avail > sizeof(struct ucx_stack_metadata)) {
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139 return avail - sizeof(struct ucx_stack_metadata);
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140 } else {
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141 return 0;
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142 }
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143 }

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