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annotate buffer.c @ 1:22d7bb03e569

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for buffer: o added a new function buffer_putc(struct buffer *, char) that append the character to the end of the buffer o fix buffer_printf on BUFFER_AUTO
author David Demelier <markand@malikania.fr>
date Tue, 06 Sep 2011 17:43:59 +0200
parents a20beb164de8
children e19a50d6a5be
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0
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1 /*
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2 * buffer.c -- safe unlimited size string
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3 *
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4 * Copyright (c) 2011, David Demelier <markand@malikania.fr>
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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 <stdio.h>
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20 #include <stdlib.h>
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21 #include <stdarg.h>
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22 #include <string.h>
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23
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24 #include "buffer.h"
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25
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26 static int buffer_grow(struct buffer *, size_t);
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27
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28 /*
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29 * Initialize a new buffer with the optional `str' as begin of buffer.
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30 */
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31
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32 struct buffer *
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33 buffer_new(const char *str, size_t bsize, int flags)
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34 {
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35 struct buffer *buf;
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36
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37 if (!(buf = malloc(sizeof (struct buffer))))
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38 return NULL;
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39
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40 memset(buf, 0, sizeof (struct buffer));
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41
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42 if (bsize == 0)
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43 bsize = BUFFER_DEFAULT_BSIZE;
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44
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45 if (!(buf->data = calloc(bsize + 1, 1))) {
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46 free(buf);
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47 return NULL;
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48 }
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49
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50 buf->size = bsize + 1;
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51 buf->bsize = bsize;
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52 buf->flags = flags;
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53
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54 if (str && buffer_strcat(buf, str) < 0) {
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55 free(buf);
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56 return NULL;
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57 }
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58
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59 return buf;
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60 }
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61
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62 /*
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63 * Concatenate the string into the buffer.
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64 */
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65
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66 int
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67 buffer_strcat(struct buffer *buf, const char *str)
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68 {
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69 size_t length;
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70
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71 length = strlen(str);
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72 if (buffer_grow(buf, length) < 0)
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73 return -1;
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74
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75 if (buf->flags & BUFFER_FIXED)
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76 length = buf->size - buf->length - 1;
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77
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78 strncat(buf->data, str, length);
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79 buf->length = strlen(buf->data);
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80
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81 return 0;
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82 }
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83
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84 /*
1
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85 * Append the character c to the end of buffer.
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86 */
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87
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88 int
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89 buffer_putc(struct buffer *buf, char c)
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90 {
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91 if (buffer_grow(buf, 1) < 0)
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92 return -1;
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93
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94 buf->data[buf->length++] = c;
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95 buf->data[buf->length] = '\0';
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96
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97 return 0;
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98 }
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99
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100 /*
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101 * Concatenate the byte pointer into the buffer.
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102 */
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103
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104 int
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105 buffer_bcat(struct buffer *buf, const void *data, size_t size)
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106 {
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107 if (buffer_grow(buf, size) < 0)
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108 return -1;
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109
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110 /* Do not truncate void pointer */
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111 if (buf->flags & BUFFER_FIXED && size > (buf->size - buf->length - 1))
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112 return -1;
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113
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114 memcpy(buf->data + buf->length, data, size);
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115 buf->length += size;
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116
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117 return 0;
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118 }
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119
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120 /*
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121 * Print into the buffer using va_list from stdarg.h
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122 */
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123
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124 int
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125 buffer_vprintf(struct buffer *buf, const char *fmt, va_list ap)
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126 {
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127 va_list ap_save;
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128 int nb, result = 1;
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129
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130 /*
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131 * vsnprintf on windows returns -1 instead of the number of bytes that
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132 * should be printed...
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133 */
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134 if (buf->flags & BUFFER_AUTO) {
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135 do {
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136 va_copy(ap_save, ap);
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137 nb = vsnprintf(buf->data + buf->length,
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138 buf->size - buf->length - 1, fmt, ap_save);
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139
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140 if (nb == -1 || nb >= buf->size - buf->length - 1) {
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141 if (buffer_grow(buf, buf->size + buf->bsize))
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142 result = -1;
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143 } else
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144 result = 0;
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145 } while (result == 1);
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146
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147 va_end(ap_save);
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148 } else {
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149 result = 0;
0
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150 vsnprintf(buf->data + buf->length, buf->size - buf->length - 1,
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151 fmt, ap);
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152 }
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153
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154 buf->length = strlen(buf->data);
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155
1
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parents: 0
diff changeset
156 return result;
0
a20beb164de8 Added buffer.c and buffer.h:
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157 }
a20beb164de8 Added buffer.c and buffer.h:
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158
a20beb164de8 Added buffer.c and buffer.h:
David Demelier <markand@malikania.fr>
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159 /*
a20beb164de8 Added buffer.c and buffer.h:
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160 * Use printf(3) functions like to write into the buffer.
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161 */
a20beb164de8 Added buffer.c and buffer.h:
David Demelier <markand@malikania.fr>
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162
a20beb164de8 Added buffer.c and buffer.h:
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163 int
a20beb164de8 Added buffer.c and buffer.h:
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164 buffer_printf(struct buffer *buf, const char *fmt, ...)
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165 {
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166 va_list ap;
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167 int status;
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168
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169 va_start(ap, fmt);
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170 status = buffer_vprintf(buf, fmt, ap);
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171 va_end(ap);
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172
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173 return status;
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174 }
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175
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176 /*
a20beb164de8 Added buffer.c and buffer.h:
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177 * Reduce the data buffer to the exact size. Returns -1 on failure.
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178 */
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179
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180 int
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181 buffer_shrink(struct buffer *buf)
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182 {
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183 if (!(buf->data = realloc(buf->data, buf->length + 1)))
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184 return -1;
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185
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186 buf->size = buf->length + 1;
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187
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188 return 0;
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189 }
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190
a20beb164de8 Added buffer.c and buffer.h:
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191 /*
a20beb164de8 Added buffer.c and buffer.h:
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192 * Returns the buffer data and then free the buffer object.
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193 */
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194
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195 char *
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196 buffer_end(struct buffer *buf)
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197 {
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198 char *data;
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199
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200 data = buf->data;
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201 free(buf);
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202
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203 return data;
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204 }
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205
a20beb164de8 Added buffer.c and buffer.h:
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206 /*
a20beb164de8 Added buffer.c and buffer.h:
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207 * Reset the struct buffer.
a20beb164de8 Added buffer.c and buffer.h:
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208 */
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209
a20beb164de8 Added buffer.c and buffer.h:
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210 void
a20beb164de8 Added buffer.c and buffer.h:
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211 buffer_clear(struct buffer *buf)
a20beb164de8 Added buffer.c and buffer.h:
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212 {
a20beb164de8 Added buffer.c and buffer.h:
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213 if (buf->data)
a20beb164de8 Added buffer.c and buffer.h:
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214 free(buf->data);
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215
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216 buf->length = 0;
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217 buf->size = 0;
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218 }
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219
a20beb164de8 Added buffer.c and buffer.h:
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220 void
a20beb164de8 Added buffer.c and buffer.h:
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221 buffer_free(struct buffer *buf)
a20beb164de8 Added buffer.c and buffer.h:
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222 {
a20beb164de8 Added buffer.c and buffer.h:
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223 buffer_clear(buf);
a20beb164de8 Added buffer.c and buffer.h:
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224 free(buf);
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225 }
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226
1
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227 /*
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228 * Functions that tries to extend the buffer to the `needed' size if the buffer
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229 * allows it. If the buffer is fixed size and there is not enough space the
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230 * functions returns -1 otherwise 0 is returned.
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231 */
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232
0
a20beb164de8 Added buffer.c and buffer.h:
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233 static int
a20beb164de8 Added buffer.c and buffer.h:
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234 buffer_grow(struct buffer *buf, size_t needed)
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David Demelier <markand@malikania.fr>
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235 {
a20beb164de8 Added buffer.c and buffer.h:
David Demelier <markand@malikania.fr>
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236 if ((buf->size - buf->length) > needed)
a20beb164de8 Added buffer.c and buffer.h:
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237 return 0;
a20beb164de8 Added buffer.c and buffer.h:
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238
a20beb164de8 Added buffer.c and buffer.h:
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239 if (buf->flags & BUFFER_AUTO) {
1
22d7bb03e569 for buffer:
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240 while (buf->size - buf->length - 1 < needed)
0
a20beb164de8 Added buffer.c and buffer.h:
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241 buf->size += buf->bsize;
a20beb164de8 Added buffer.c and buffer.h:
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242
a20beb164de8 Added buffer.c and buffer.h:
David Demelier <markand@malikania.fr>
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243 if (!(buf->data = realloc(buf->data, buf->size)))
a20beb164de8 Added buffer.c and buffer.h:
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244 return -1;
1
22d7bb03e569 for buffer:
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245 } else if ((buf->flags & BUFFER_FIXED))
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246 return (buf->bsize == buf->length) ? -1 : 0;
0
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247
a20beb164de8 Added buffer.c and buffer.h:
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248 memset(buf->data + buf->length, 0, buf->size - buf->length);
a20beb164de8 Added buffer.c and buffer.h:
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249
a20beb164de8 Added buffer.c and buffer.h:
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250 return 0;
a20beb164de8 Added buffer.c and buffer.h:
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parents:
diff changeset
251 }