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annotate libmlk-util/mlk/util/dir.c @ 646:7e1eb7f6c049 default tip @

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misc: remove .clang
author David Demelier <markand@malikania.fr>
date Sun, 04 Feb 2024 15:24:37 +0100
parents f937857336f3
children
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1 /*
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2 * dir.c -- portable directory iterator
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3 *
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4 * Copyright (c) 2020-2023 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 <assert.h>
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20
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21 #include "dir.h"
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22 #include "sysconfig.h"
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23
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24 #if defined(MLK_HAVE_DIRENT_H)
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25
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26 /* {{{ Generic dirent.h support. */
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27
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28 #include <dirent.h>
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <string.h>
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32
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33 struct self {
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34 DIR *dp;
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35 struct dirent *entry;
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36 };
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37
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38 static inline int
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39 skip(const struct self *self)
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40 {
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41 return strcmp(self->entry->d_name, ".") == 0 ||
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42 strcmp(self->entry->d_name, "..") == 0;
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43 }
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44
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45 static void
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46 handle_finish(struct mlk_dir *iter)
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47 {
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48 struct self *self = iter->handle;
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49
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50 if (self) {
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51 closedir(self->dp);
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52 free(self);
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53 }
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54
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55 iter->entry = NULL;
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56 iter->handle = NULL;
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57 }
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58
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59 static int
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60 handle_open(struct mlk_dir *iter, const char *path)
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61 {
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62 struct self *self;
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63
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64 if (!(self = calloc(1, sizeof (*self))))
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65 return -1;
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66 if (!(self->dp = opendir(path))) {
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67 free(self);
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68 return -1;
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69 }
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70
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71 iter->handle = self;
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72
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73 return 0;
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74 }
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75
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76 static int
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77 handle_next(struct mlk_dir *iter)
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78 {
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79 struct self *self = iter->handle;
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80
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81 /* Skip . and .. which are barely useful. */
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82 while ((self->entry = readdir(self->dp)) && skip(self))
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83 continue;
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84
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85 /* End of directory, free all and indicate EOF to the user. */
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86 if (!self->entry) {
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87 handle_finish(iter);
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88 return 0;
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89 }
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90
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91 iter->entry = self->entry->d_name;
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92
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93 return 1;
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94 }
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95
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96 /* }}} */
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97
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98 #elif defined(_WIN32)
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99
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100 /* {{{ Native Windows implementation. */
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101
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102 #include <stdio.h>
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103 #include <stdlib.h>
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104 #include <string.h>
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105 #include <windows.h>
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106
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107 struct self {
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108 WIN32_FIND_DATA data;
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109 HANDLE handle;
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110 int cached;
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111 };
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112
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113 static inline int
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114 skip(const struct self *self)
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115 {
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116 return strcmp(self->data.cFileName, ".") == 0 ||
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117 strcmp(self->data.cFileName, "..") == 0;
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118 }
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119
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120 static void
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121 handle_finish(struct mlk_dir *iter)
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122 {
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123 struct self *self = iter->handle;
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124
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125 if (self) {
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126 FindClose(self->handle);
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127 free(self);
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128 }
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129
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130 iter->entry = NULL;
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131 iter->handle = NULL;
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132 }
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133
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134 static int
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135 handle_open(struct mlk_dir *iter, const char *path)
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136 {
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137 struct self *self;
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138 char directory[MAX_PATH];
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139 BOOL ret = TRUE;
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140
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141 snprintf(directory, sizeof (directory), "%s\\*", path);
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142
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143 if (!(self = calloc(1, sizeof (*self))))
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144 return -1;
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145 if ((self->handle = FindFirstFileA(directory, &self->data)) == INVALID_HANDLE_VALUE) {
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146 free(self);
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147 return -1;
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148 }
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149
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150 /* Skip . and .. */
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151 while (skip(self) && (ret = FindNextFileA(self->handle, &self->data)))
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152 continue;
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153
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154 /* Something failed. */
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155 if (!ret) {
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156 handle_finish(iter);
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157 return -1;
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158 }
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159
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160 self->cached = 1;
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161 iter->entry = self->data.cFileName;
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162 iter->handle = self;
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163
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164 return 0;
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165 }
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166
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167 static int
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168 handle_next(struct mlk_dir *iter)
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169 {
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170 struct self *self = iter->handle;
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171 BOOL ret = TRUE;
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172
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173 /* Returning the first entry on open. */
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174 if (self->cached)
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175 self->cached = 0;
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176 else {
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177 /* The . and .. can still appear now. */
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178 while ((ret = FindNextFileA(self->handle, &self->data)) && skip(self))
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179 continue;
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180
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181 if (!ret)
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182 handle_finish(iter);
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183 }
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184
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185 return iter->entry != NULL;
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186 }
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187
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188 /* }}} */
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189
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190 #else
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191
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192 /* {{{ No-op implementation */
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193
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194 #include <stddef.h>
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195
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196 static int
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197 handle_open(struct mlk_dir *iter, const char *path)
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198 {
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199 (void)path;
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200
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201 iter->entry = NULL;
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202 iter->handle = NULL;
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203
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204 return -1;
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205 }
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206
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207 static int
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208 handle_next(struct mlk_dir *iter)
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209 {
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210 (void)iter;
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211
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212 return 0;
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213 }
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214
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215 static void
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216 handle_finish(struct mlk_dir *iter)
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217 {
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218 (void)iter;
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219 }
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220
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221 /* }}} */
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222
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223 #endif
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224
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225 int
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226 mlk_dir_open(struct mlk_dir *iter, const char *path)
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227 {
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228 assert(path);
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229
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230 iter->entry = NULL;
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231 iter->handle = NULL;
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232
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233 return handle_open(iter, path);
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234 }
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235
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236 int
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237 mlk_dir_next(struct mlk_dir *iter)
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238 {
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239 assert(iter);
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240
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241 return handle_next(iter);
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242 }
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243
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244 void
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245 mlk_dir_finish(struct mlk_dir *iter)
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246 {
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247 handle_finish(iter);
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248 }