src/ucx/stack.c

Tue, 01 Nov 2022 16:54:24 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Tue, 01 Nov 2022 16:54:24 +0100
changeset 405
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parent 254
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permissions
-rw-r--r--

add vfs support to dir_redirect

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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 2017 Mike Becker, 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 "ucx/stack.h"
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30
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31 #include <string.h>
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32
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33 static size_t ucx_stack_align(size_t n) {
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34 int align = n % sizeof(void*);
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35 if (align) {
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36 n += sizeof(void*) - align;
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37 }
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38 return n;
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39 }
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40
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41 void ucx_stack_init(UcxStack *stack, char* space, size_t size) {
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42 stack->size = size - size % sizeof(void*);
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43 stack->space = space;
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44 stack->top = NULL;
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45
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46 stack->allocator.pool = stack;
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47 stack->allocator.malloc = (ucx_allocator_malloc) ucx_stack_malloc;
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48 stack->allocator.calloc = (ucx_allocator_calloc) ucx_stack_calloc;
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49 stack->allocator.realloc = (ucx_allocator_realloc) ucx_stack_realloc;
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50 stack->allocator.free = (ucx_allocator_free) ucx_stack_free;
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51 }
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52
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53 void *ucx_stack_malloc(UcxStack *stack, size_t n) {
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54
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55 if (ucx_stack_avail(stack) < ucx_stack_align(n)) {
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56 return NULL;
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57 } else {
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58 char *prev = stack->top;
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59 if (stack->top) {
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60 stack->top += ucx_stack_align(ucx_stack_topsize(stack));
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61 } else {
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62 stack->top = stack->space;
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63 }
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64
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65 ((struct ucx_stack_metadata*)stack->top)->prev = prev;
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66 ((struct ucx_stack_metadata*)stack->top)->size = n;
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67 stack->top += sizeof(struct ucx_stack_metadata);
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68
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69 return stack->top;
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70 }
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71 }
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72
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73 void *ucx_stack_calloc(UcxStack *stack, size_t nelem, size_t elsize) {
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74 void *mem = ucx_stack_malloc(stack, nelem*elsize);
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75 memset(mem, 0, nelem*elsize);
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76 return mem;
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77 }
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78
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79 void *ucx_stack_realloc(UcxStack *stack, void *ptr, size_t n) {
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80 if (ptr == stack->top) {
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81 if (stack->size - (stack->top - stack->space) < ucx_stack_align(n)) {
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82 return NULL;
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83 } else {
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84 ((struct ucx_stack_metadata*)stack->top - 1)->size = n;
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85 return ptr;
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86 }
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87 } else {
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88 if (ucx_stack_align(((struct ucx_stack_metadata*)ptr - 1)->size) <
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89 ucx_stack_align(n)) {
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90 void *nptr = ucx_stack_malloc(stack, n);
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91 if (nptr) {
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92 memcpy(nptr, ptr, n);
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93 ucx_stack_free(stack, ptr);
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94
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95 return nptr;
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96 } else {
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97 return NULL;
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98 }
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99 } else {
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100 ((struct ucx_stack_metadata*)ptr - 1)->size = n;
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101 return ptr;
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102 }
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103 }
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104 }
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105
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106 void ucx_stack_free(UcxStack *stack, void *ptr) {
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107 if (ptr == stack->top) {
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108 stack->top = ((struct ucx_stack_metadata*) stack->top - 1)->prev;
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109 } else {
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110 struct ucx_stack_metadata *next = (struct ucx_stack_metadata*)(
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111 (char*)ptr +
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112 ucx_stack_align(((struct ucx_stack_metadata*) ptr - 1)->size)
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113 );
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114 next->prev = ((struct ucx_stack_metadata*) ptr - 1)->prev;
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115 }
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116 }
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117
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118 void ucx_stack_popn(UcxStack *stack, void *dest, size_t n) {
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119 if (ucx_stack_empty(stack)) {
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120 return;
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121 }
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122
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123 if (dest) {
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124 size_t len = ucx_stack_topsize(stack);
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125 if (len > n) {
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126 len = n;
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127 }
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128
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129 memcpy(dest, stack->top, len);
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130 }
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131
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132 ucx_stack_free(stack, stack->top);
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133 }
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134
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135 size_t ucx_stack_avail(UcxStack *stack) {
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136 size_t avail = ((stack->top ? (stack->size
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137 - (stack->top - stack->space)
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138 - ucx_stack_align(ucx_stack_topsize(stack)))
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139 : stack->size));
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140
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141 if (avail > sizeof(struct ucx_stack_metadata)) {
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142 return avail - sizeof(struct ucx_stack_metadata);
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143 } else {
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144 return 0;
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145 }
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146 }
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147
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148 void *ucx_stack_push(UcxStack *stack, size_t n, const void *data) {
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149 void *space = ucx_stack_malloc(stack, n);
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150 if (space) {
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151 memcpy(space, data, n);
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152 }
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153 return space;
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154 }
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155
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156 void *ucx_stack_pusharr(UcxStack *stack,
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157 size_t nelem, size_t elsize, const void *data) {
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158
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159 // skip the memset by using malloc
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160 void *space = ucx_stack_malloc(stack, nelem*elsize);
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161 if (space) {
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162 memcpy(space, data, nelem*elsize);
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163 }
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164 return space;
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165 }

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