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annotate src/libmlk-core/core/buf.c @ 423:63ebfa352ae1

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core: use err.h in font
author David Demelier <markand@malikania.fr>
date Sat, 15 Oct 2022 14:00:38 +0200
parents 460c78706989
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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347
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1 /*
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2 * buf.c -- simple string buffer for C
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3 *
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460c78706989 misc: update copyright years
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4 * Copyright (c) 2019-2022 David Demelier <markand@malikania.fr>
347
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <errno.h>
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21 #include <stdint.h>
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22 #include <stdlib.h>
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23 #include <stdio.h>
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24 #include <string.h>
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25
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26 #include "buf.h"
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27
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28 /*
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29 * Try to increase the buffer length by a power of two until we have enough
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30 * space to fit `desired'.
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31 *
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32 * Detects overflow and return -1 if happened or reallocation could not
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33 * occur.
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34 */
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35 static int
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36 growdbl(struct buf *b, size_t desired)
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37 {
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38 size_t newcap = b->capacity;
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39 void *newptr;
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40
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41 while (desired > newcap - b->length) {
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42 const size_t r = newcap * 2;
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43
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44 /* Overflow occured. */
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45 if (r / newcap != 2) {
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46 #if defined(ENOMEM)
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47 errno = ENOMEM;
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48 #endif
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49 return -1;
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50 }
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51
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52 newcap = r;
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53 }
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54
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55 /* At this step we must have enough room. */
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56 assert(newcap - b->length >= desired);
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57
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58 /* Pretty much impossible to reach but always assume it's possible. */
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59 if (newcap == SIZE_MAX) {
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60 #if defined(ENOMEM)
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61 errno = ENOMEM;
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62 #endif
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63 return -1;
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64 }
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65
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66 if (!(newptr = BUF_REALLOC(b->data, newcap + 1)))
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67 return -1;
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68
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69 b->data = newptr;
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70 b->capacity = newcap;
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71
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72 return 0;
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73 }
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74
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75 /*
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76 * Try to allocate just enough space for the `desired' amount of space. This is
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77 * only used when the buffer is already too large but hasn't reached SIZE_MAX
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78 * yet.
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79 *
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80 * Returns -1 if allocation failed.
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81 */
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82 static int
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83 growmin(struct buf *b, size_t desired)
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84 {
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85 size_t newcap;
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86 void *newptr;
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87
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88 if (desired >= SIZE_MAX - b->length) {
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89 #if defined(ENOMEM)
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90 errno = ENOMEM;
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91 #endif
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92 return -1;
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93 }
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94
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95 /* Don't forget to keep what's remaining between capacity and length. */
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96 newcap = b->capacity + (desired - (b->capacity - b->length));
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97
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98 /* Try to reallocate. */
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99 if (!(newptr = BUF_REALLOC(b->data, newcap + 1)))
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100 return -1;
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101
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102 b->data = newptr;
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103 b->capacity = newcap;
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104
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105 return 0;
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106 }
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107
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108 /*
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109 * Entry point for reallocating data. Will try to allocate twice until we have
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110 * enough room and then only the minimal amount.
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111 */
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112 static int
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113 grow(struct buf *b, size_t desired)
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114 {
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115 const size_t avail = b->capacity - b->length;
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116
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117 if (avail >= desired)
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118 return 0;
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119
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120 if (!b->capacity) {
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121 if (!(b->data = BUF_MALLOC(desired + 1)))
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122 return -1;
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123
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124 b->capacity = desired;
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125 } else if (growdbl(b, desired) < 0 && growmin(b, desired) < 0)
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126 return -1;
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127
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128 return 0;
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129 }
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130
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131 void
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132 buf_init(struct buf *b)
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133 {
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134 assert(b);
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135
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136 memset(b, 0, sizeof (*b));
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137 }
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138
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139 int
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140 buf_reserve(struct buf *b, size_t amount)
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141 {
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142 assert(b);
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143
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144 if (grow(b, amount) < 0)
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145 return -1;
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146
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147 return 0;
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148 }
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149
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150 int
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151 buf_resize(struct buf *b, size_t size, char ch)
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152 {
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153 assert(b);
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154
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155 /* New size is smaller than curren't length, just update it. */
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156 if (size < b->length) {
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157 b->data[b->length = size] = 0;
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158 return 0;
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159 }
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160
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161 /* New size is bigger, data may be reallocated. */
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
162 if (grow(b, size - b->length) < 0)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
163 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
164
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
165 memset(&b->data[b->length], ch, size - b->length);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
166 b->length = size;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
167 b->data[b->length] = 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
168
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
169 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
170 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
171
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
172 int
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
173 buf_shrink(struct buf *b)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
174 {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
175 assert(b);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
176
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
177 void *newptr;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
178
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
179 if (b->length == 0) {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
180 free(b->data);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
181 b->data = NULL;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
182 b->length = b->capacity = 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
183 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
184 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
185
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
186 if (!(newptr = BUF_REALLOC(b->data, b->length + 1)))
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
187 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
188
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
189 b->data = newptr;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
190 b->capacity = b->length;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
191
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
192 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
193 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
194
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
195 void
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
196 buf_erase(struct buf *b, size_t pos, size_t count)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
197 {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
198 assert(b);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
199 assert(pos <= b->length);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
200
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
201 if (count > b->length - pos) {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
202 /* Optimize whole erase at pos. */
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
203 b->data[pos] = 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
204 b->length = pos;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
205 } else {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
206 memmove(&b->data[pos], &b->data[pos + count], b->length - count);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
207 b->length -= count;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
208 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
209 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
210
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
211 int
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
212 buf_putc(struct buf *b, char c)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
213 {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
214 assert(b);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
215
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
216 if (grow(b, 1) < 0)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
217 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
218
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
219 b->data[b->length++] = c;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
220 b->data[b->length] = 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
221
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
222 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
223 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
224
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
225 int
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
226 buf_puts(struct buf *b, const char *s)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
227 {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
228 assert(b);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
229 assert(s);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
230
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
231 const size_t len = strlen(s);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
232
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
233 if (grow(b, len) < 0)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
234 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
235
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
236 memcpy(&b->data[b->length], s, len + 1);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
237 b->length += len;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
238
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
239 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
240 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
241
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
242 int
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
243 buf_printf(struct buf *b, const char *fmt, ...)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
244 {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
245 assert(b);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
246 assert(fmt);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
247
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
248 va_list ap;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
249 int ret;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
250
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
251 va_start(ap, fmt);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
252 ret = buf_vprintf(b, fmt, ap);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
253 va_end(ap);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
254
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
255 return ret;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
256 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
257
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
258 int
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
259 buf_vprintf(struct buf *b, const char *fmt, va_list args)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
260 {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
261 assert(b);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
262 assert(fmt);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
263
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
264 va_list ap;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
265 int amount;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
266
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
267 /* Determine length. */
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
268 va_copy(ap, args);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
269 amount = vsnprintf(NULL, 0, fmt, ap);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
270 va_end(ap);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
271
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
272 if (amount < 0)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
273 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
274
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
275 /* Do actual copy. */
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
276 if (grow(b, amount) < 0)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
277 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
278
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
279 va_copy(ap, args);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
280 amount = vsprintf(&b->data[b->length], fmt, ap);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
281 va_end(ap);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
282
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
283 if (amount < 0)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
284 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
285
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
286 b->length += amount;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
287
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
288 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
289 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
290
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
291 int
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
292 buf_sub(struct buf *b, const struct buf *src, size_t pos, size_t count)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
293 {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
294 assert(b);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
295 assert(src);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
296 assert(pos <= src->length);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
297
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
298 if (count >= src->length)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
299 count = src->length - pos;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
300 if (!(b->data = BUF_MALLOC(count + 1)))
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
301 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
302
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
303 strncpy(b->data, &src->data[pos], count);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
304 b->length = count;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
305 b->capacity = count;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
306 b->data[b->length] = 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
307
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
308 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
309 }
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
310
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
311 int
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
312 buf_dup(struct buf *b, const struct buf *src)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
313 {
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
314 assert(b);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
315 assert(src);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
316
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
317 if (!src->data)
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
318 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
319 if (!(b->data = BUF_MALLOC(src->length + 1)))
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
320 return -1;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
321
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
322 memcpy(b->data, src->data, src->length + 1);
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
323 b->capacity = src->length;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
324 b->length = src->length;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
325
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
326 return 0;
0969931b98e4 core: start removing POSIX APIs
David Demelier <markand@malikania.fr>
parents:
diff changeset
327 }
0969931b98e4 core: start removing POSIX APIs
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parents:
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328
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329 void
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330 buf_clear(struct buf *b)
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331 {
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332 assert(b);
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333
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334 if (b->data)
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335 b->data[b->length = 0] = 0;
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336 }
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parents:
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337
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parents:
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338 void
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339 buf_finish(struct buf *b)
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340 {
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341 assert(b);
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parents:
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342
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343 BUF_FREE(b->data);
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344 b->data = NULL;
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345 b->capacity = b->length = 0;
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346 }