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996
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1 /*
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2 This code was taken (and slightly modified to compile in cfunge) from:
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3 CrossFire, A Multiplayer game for X-windows
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4
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5 Copyright (C) 2008 Crossfire Development Team
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6
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7 This program is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 2 of the License, or
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10 (at your option) any later version.
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11
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with this program; if not, write to the Free Software
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19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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20
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21 The authors can be reached via e-mail at crossfire-devel@real-time.com
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22 */
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23
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24 /*
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25 * Modifications for cfunge:
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26 * - Drop some crossfire specific includes and functions that depended on other
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27 * parts of crossfire.
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28 * - Adding stringbuffer_destroy
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29 * - Adding GCC attributes.
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30 *
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31 */
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32
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33 #include <stdarg.h>
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34 #include <stdlib.h>
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35 #include <string.h>
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36
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37 #include "../../src/global.h"
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38 #include <stdbool.h>
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39 #include "stringbuffer.h"
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40
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41
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42 struct StringBuffer {
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43 /**
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44 * The string buffer. The first {@link #pos} bytes contain the collected
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45 * string. It's size is at least {@link #size} bytes.
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46 */
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47 char *buf;
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48
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49 /**
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50 * The current length of {@link #buf}. The invariant <code>pos <
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51 * size</code> always holds; this means there is always enough room to
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52 * attach a trailing \0 character.
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53 */
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54 size_t pos;
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55
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56 /**
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57 * The allocation size of {@link #buf}.
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58 */
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59 size_t size;
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60 };
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61
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62
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63 /**
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64 * Make sure that at least <code>len</code> bytes are available in the passed
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65 * string buffer.
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66 *
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67 * @param sb The string buffer to modify.
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68 *
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69 * @param len The number of bytes to allocate.
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70 */
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71 FUNGE_ATTR_FAST
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72 static bool stringbuffer_ensure(StringBuffer *sb, size_t len);
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73
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74 FUNGE_ATTR_FAST
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75 StringBuffer *stringbuffer_new(void)
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76 {
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77 StringBuffer *sb;
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78
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79 sb = malloc(sizeof(*sb));
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80 if (sb == NULL) {
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81 return NULL;
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82 }
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83
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84 sb->size = 256;
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85 sb->buf = malloc(sb->size);
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86 sb->pos = 0;
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87 return sb;
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88 }
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89
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90 FUNGE_ATTR_FAST
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91 void stringbuffer_destroy(StringBuffer *sb)
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92 {
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93 free(sb->buf);
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94 free(sb);
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95 }
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96
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97 FUNGE_ATTR_FAST
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98 char *stringbuffer_finish(StringBuffer * restrict sb, size_t * restrict length)
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99 {
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100 char *result;
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101
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102 sb->buf[sb->pos] = '\0';
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103 if (length)
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104 *length = sb->pos;
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105 result = sb->buf;
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106 free(sb);
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107 return result;
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108 }
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109
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110 FUNGE_ATTR_FAST
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111 void stringbuffer_append_char(StringBuffer *sb, const char c)
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112 {
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113 stringbuffer_ensure(sb, 2);
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114 sb->buf[sb->pos] = c;
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115 sb->pos += 1;
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116 }
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117
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118 FUNGE_ATTR_FAST
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119 void stringbuffer_append_string(StringBuffer *sb, const char *str)
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120 {
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121 size_t len;
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122
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123 len = strlen(str);
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124 stringbuffer_ensure(sb, len+1);
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125 memcpy(sb->buf+sb->pos, str, len);
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126 sb->pos += len;
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127 }
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128
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129 FUNGE_ATTR_FAST
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130 void stringbuffer_append_printf(StringBuffer *sb, const char *format, ...)
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131 {
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132 size_t size;
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133
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134 size = 100; /* arbitrary guess */
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135 for (;;) {
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136 int n;
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137 va_list arg;
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138
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139 stringbuffer_ensure(sb, size);
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140
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141 va_start(arg, format);
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142 n = vsnprintf(sb->buf+sb->pos, size, format, arg);
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143 va_end(arg);
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144
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145 if (n > -1 && (size_t)n < size) {
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146 sb->pos += (size_t)n;
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147 break;
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148 }
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149
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150 if (n > -1) {
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151 size = (size_t)(n+1); /* precisely what is needed */
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152 } else {
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153 size *= 2; /* twice the old size */
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154 }
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155 }
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156 }
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157
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158 FUNGE_ATTR_FAST
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159 void stringbuffer_append_stringbuffer(StringBuffer * restrict sb,
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160 const StringBuffer * restrict sb2)
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161 {
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162 stringbuffer_ensure(sb, sb2->pos+1);
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163 memcpy(sb->buf+sb->pos, sb2->buf, sb2->pos);
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164 sb->pos += sb2->pos;
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165 }
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166
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167 FUNGE_ATTR_FAST
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168 static bool stringbuffer_ensure(StringBuffer *sb, size_t len)
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169 {
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170 char *tmp;
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171 size_t new_size;
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172
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173 if (sb->pos+len <= sb->size) {
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174 return true;
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175 }
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176
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177 new_size = sb->pos+len+256;
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178 tmp = realloc(sb->buf, new_size);
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179 if (tmp == NULL) {
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180 return false;
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181 }
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182 sb->buf = tmp;
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183 sb->size = new_size;
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184 return true;
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185 }
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