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annotate buf.c @ 170:fd138f2a9773

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Add C++ portable sockets
author David Demelier <markand@malikania.fr>
date Tue, 10 Sep 2013 15:17:56 +0200
parents 7f214f26a4c0
children
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1 /*
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2 * buf.c -- easy way to manipulate strings
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3 *
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4 * Copyright (c) 2011, 2012, 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 <string.h>
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22
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23 #include "buf.h"
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24
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25 #define BUF_AVAIL(buf) ((buf)->alsize - (buf)->length)
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26 #define BUF_SAFE(buf) (!((buf)->flags & BUF_UNSAFE))
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27 #define BUF_FIXED(buf) ((buf)->flags & BUF_FIXED)
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28 #define BUF_AUTO(buf) (buf->flags == 0)
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29
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30 static void copy(struct buf *, const void *, size_t);
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31 static int grow(struct buf *, size_t);
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32
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33 int
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34 buf_init(struct buf *buf, const char *txt)
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35 {
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36 /* Set defaults if needed */
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37 buf->chksize = (buf->chksize <= 0) ? 128 : buf->chksize;
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38 buf->alsize = buf->chksize + 1;
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39 buf->malloc = (buf->malloc == NULL) ? &malloc : buf->malloc;
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40 buf->realloc = (buf->realloc == NULL) ? &realloc : buf->realloc;
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41
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42 if ((buf->text = buf->malloc(buf->alsize)) == NULL)
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43 return -1;
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44
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45 if (txt != NULL)
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46 buf_cat(buf, txt);
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47
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48 memset(buf->text, 0, buf->alsize);
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49
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50 return 0;
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51 }
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52
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53 void
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54 buf_set(struct buf *buf, const char *fmt, ...)
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55 {
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56 va_list ap;
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57 const char *p;
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58
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59 va_start(ap, fmt);
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60 for (p = fmt; *p != '\0'; ++p)
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61 switch (*p) {
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62 case 'l':
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63 buf->chksize = va_arg(ap, int);
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64 break;
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65 case 'm':
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66 buf->malloc = va_arg(ap, void *(*)(size_t));
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67 break;
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68 case 'r':
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69 buf->realloc = va_arg(ap, void *(*)(void *, size_t));
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70 break;
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71 case 'f':
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72 case 't':
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73 buf->flags = va_arg(ap, int);
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74 break;
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75 default:
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76 break;
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77 }
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78 }
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79
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80 /*
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81 * This function appends not more than max characters from str.
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82 */
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83 int
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84 buf_ncat(struct buf *buf, const char *str, size_t max)
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85 {
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86 size_t tocopy = max;
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87
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88 for (tocopy = 0; str[tocopy] != '\0' && tocopy < max; ++tocopy)
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89 continue;
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90
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91 if (BUF_AVAIL(buf) <= tocopy) {
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92 /* Can't add more */
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93 if (BUF_SAFE(buf) && BUF_FIXED(buf))
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94 return -1;
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95
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96 if (BUF_AUTO(buf)) {
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97 if (grow(buf, tocopy) < 0)
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98 return -1;
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99 } else {
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100 /* String is unsafe, truncate to the available size */
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101 tocopy = BUF_AVAIL(buf) - 1;
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102 }
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103 }
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104
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105 copy(buf, str, tocopy);
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106
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107 return 0;
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108 }
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109
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110 /*
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111 * Append the string str to the end of the string buffer.
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112 */
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113 int
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114 buf_cat(struct buf *buf, const char *str)
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115 {
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116 return buf_ncat(buf, str, strlen(str));
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117 }
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118
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119 /*
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120 * Append the caracter c to the end of buffer
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121 */
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122 int
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123 buf_putc(struct buf *buf, int c)
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124 {
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125 char str[2] = { c, '\0' };
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126
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127 return buf_ncat(buf, str, 1);
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128 }
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129
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130 /*
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131 * Concatenate the printf(3) like call to the string buffer, this function
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132 * returns -1 on fixed safe buffer, otherwise 0 is returned if there
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133 * is no allocation failure.
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134 */
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135 int
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136 buf_vprintf(struct buf *buf, const char *fmt, va_list ap)
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137 {
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138 int copied, rv = 0, done = 0;
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139
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140 if (BUF_FIXED(buf) && BUF_SAFE(buf))
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141 return -1;
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142
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143 do {
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144 copied = vsnprintf(&buf->text[buf->length],
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145 BUF_AVAIL(buf), fmt, ap);
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146
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147 if (copied >= (signed int)BUF_AVAIL(buf) || copied == -1) {
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148 if (BUF_FIXED(buf))
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149 done = 1;
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150
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151 /*
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152 * vsnprintf returns -1 on windows, we need to grow
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153 * the buffer by block size.
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154 */
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155 if (grow(buf, buf->alsize + buf->chksize) < 0) {
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156 done = 1;
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157 rv = -1;
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158 }
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159 } else {
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160 done = 1;
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161 }
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162 } while (!done);
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163
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164 buf->length = strlen(buf->text);
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165
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166 return rv;
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167 }
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168
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169 int
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170 buf_printf(struct buf *buf, const char *fmt, ...)
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171 {
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172 va_list ap;
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173 int rv;
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174
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175 va_start(ap, fmt);
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176 rv = buf_vprintf(buf, fmt, ap);
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177 va_end(ap);
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178
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179 return rv;
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180 }
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181
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182 /*
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183 * Realloc the string to it's size and remove useless bytes.
129
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184 */
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185 int
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186 buf_trim(struct buf *buf)
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187 {
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188 if ((buf->text = realloc(buf->text, buf->length + 1)) == NULL) {
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189 buf->alsize = 0;
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190 return -1;
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191 }
129
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192
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193 buf->alsize = buf->length + 1;
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194
133
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195 return 0;
129
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196 }
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197
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198 /*
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199 * Remove `n' characters from the buffer, a positive value will cut the string
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200 * from beginning, negative value will cut from end.
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201 */
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202 void
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203 buf_cut(struct buf *buf, int start)
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204 {
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205 if ((start > 0 && start >= buf->length) ||
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206 (start < 0 && (int)buf->length + start < 0))
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207 return;
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208
158
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209 if (start < 0 && (int)buf->length + start >= 0)
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210 start = buf->length + start;
141
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211
156
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212 buf->text[start] = '\0';
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213 buf->length -= buf->length - start;
141
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214 }
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215
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216 /*
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217 * Clear the string buffer.
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218 */
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219 void
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220 buf_clear(struct buf *buf)
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221 {
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222 memset(buf->text, 0, buf->alsize);
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223
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224 buf->length = 0;
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225 }
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226
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227 void
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228 buf_free(struct buf *buf)
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229 {
133
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230 if (buf != NULL) {
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231 buf_clear(buf);
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232 free(buf->text);
125
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233
133
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234 buf->text = NULL;
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235 buf->alsize = 0;
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236 }
125
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237 }
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238
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239 /*
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240 * Append to the end of buffer the void ptr of count size.
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241 */
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242 static void
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243 copy(struct buf *buf, const void *ptr, size_t count)
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244 {
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245 memcpy(buf->text + buf->length, ptr, count);
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246
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247 buf->text[buf->length + count] = '\0';
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248 buf->length += count;
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249 }
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250
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251 /*
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252 * Grow the text buffer until the available size fit the needed
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253 * size. This function may return -1 on allocation failure.
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254 */
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255 static int
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256 grow(struct buf *buf, size_t needed)
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257 {
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258 while (BUF_AVAIL(buf) <= needed) {
166
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259 buf->text = buf->realloc(buf->text, buf->alsize + buf->chksize);
125
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260
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261 if (buf->text == NULL)
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262 return -1;
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263
166
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264 buf->alsize += buf->chksize;
125
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265 }
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266
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267 return 0;
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268 }