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Added buffer.c and buffer.h: Various function to manipulate safely string buffers. It is similar to sbuf(9) on FreeBSD but more portable and simpler.
author David Demelier <markand@malikania.fr>
date Mon, 05 Sep 2011 23:01:29 +0200
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children 22d7bb03e569
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a20beb164de8 Added buffer.c and buffer.h:
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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 /*
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85 * Concatenate the byte pointer into the buffer.
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86 */
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87
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88 int
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89 buffer_bcat(struct buffer *buf, const void *data, size_t size)
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90 {
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91 if (buffer_grow(buf, size) < 0)
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92 return -1;
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93
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94 /* Do not truncate void pointer */
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95 if (buf->flags & BUFFER_FIXED && size > (buf->size - buf->length - 1))
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96 return -1;
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97
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98 memcpy(buf->data + buf->length, data, size);
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99 buf->length += size;
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100
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101 return 0;
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102 }
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103
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104 /*
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105 * Print into the buffer using va_list from stdarg.h
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106 */
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107
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108 int
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109 buffer_vprintf(struct buffer *buf, const char *fmt, va_list ap)
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110 {
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111 va_list ap_save;
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112 int nb, stop = 0;
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113
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114 /*
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115 * vsnprintf on windows returns -1 instead of the number of bytes that
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116 * should be printed...
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117 */
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118 if (buf->flags & BUFFER_AUTO) {
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119 do {
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120 va_copy(ap_save, ap);
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121 nb = vsnprintf(buf->data + buf->length,
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122 buf->size - buf->length - 1, fmt, ap_save);
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123
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124 if (nb == -1 || nb > strlen(buf->data)) {
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125 if (buffer_grow(buf, buf->size + buf->bsize))
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126 return -1;
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127 } else
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128 stop = 1;
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129 } while (stop == 0);
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130 } else
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131 vsnprintf(buf->data + buf->length, buf->size - buf->length - 1,
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132 fmt, ap);
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133
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134 va_end(ap_save);
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135
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136 return 0;
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137 }
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138
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139 /*
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140 * Use printf(3) functions like to write into the buffer.
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141 */
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142
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143 int
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144 buffer_printf(struct buffer *buf, const char *fmt, ...)
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145 {
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146 va_list ap;
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147 int status;
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148
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149 va_start(ap, fmt);
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150 status = buffer_vprintf(buf, fmt, ap);
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151 va_end(ap);
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152
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153 return status;
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154 }
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155
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156 /*
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157 * Reduce the data buffer to the exact size. Returns -1 on failure.
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158 */
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159
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160 int
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161 buffer_shrink(struct buffer *buf)
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162 {
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163 if (!(buf->data = realloc(buf->data, buf->length + 1)))
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164 return -1;
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165
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166 buf->size = buf->length + 1;
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167
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168 return 0;
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169 }
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170
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171 /*
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172 * Returns the buffer data and then free the buffer object.
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173 */
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174
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175 char *
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176 buffer_end(struct buffer *buf)
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177 {
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178 char *data;
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179
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180 data = buf->data;
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181 free(buf);
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182
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183 return data;
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184 }
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185
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186 /*
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187 * Reset the struct buffer.
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188 */
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189
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190 void
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191 buffer_clear(struct buffer *buf)
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192 {
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193 if (buf->data)
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194 free(buf->data);
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195
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196 buf->length = 0;
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197 buf->size = 0;
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198 }
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199
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200 void
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201 buffer_free(struct buffer *buf)
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202 {
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203 buffer_clear(buf);
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204 free(buf);
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205 }
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206
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207 static int
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208 buffer_grow(struct buffer *buf, size_t needed)
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209 {
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210 if ((buf->size - buf->length) > needed)
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211 return 0;
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212
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213 if (buf->flags & BUFFER_AUTO) {
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214 while (buf->size - buf->length < needed)
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215 buf->size += buf->bsize;
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216
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217 if (!(buf->data = realloc(buf->data, buf->size)))
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218 return -1;
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219 }
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220
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221 memset(buf->data + buf->length, 0, buf->size - buf->length);
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222
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223 return 0;
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224 }