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annotate libmlk-core/core/sys.c @ 258:f978fa0137ce

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extern: provide libcompat
author David Demelier <markand@malikania.fr>
date Sat, 05 Dec 2020 15:57:02 +0100
parents d987a5fc4a3e
children 16be1ad3ddba
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1 /*
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2 * sys.c -- system routines
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3 *
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4 * Copyright (c) 2020 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
241
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19 #include "sysconfig.h"
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20
32
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21 #include <assert.h>
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22 #include <stdio.h>
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23 #include <stdlib.h>
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24 #include <limits.h>
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25
241
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26 #if defined(_WIN32)
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27 # include <shlwapi.h>
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28 # include <windows.h>
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29 #else
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30 # include <sys/stat.h>
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31 # include <errno.h>
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32 # include <string.h>
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33 #endif
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34
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35 #include <SDL.h>
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36 #include <SDL_image.h>
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37 #include <SDL_mixer.h>
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38 #include <SDL_ttf.h>
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39
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40 #include "error.h"
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41 #include "sound.h"
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42 #include "sys.h"
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43
241
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44 static struct {
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45 char organization[128];
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46 char name[128];
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47 } info = {
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48 .organization = "fr.malikania",
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49 .name = "molko"
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50 };
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51
241
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52 static const char *paths[] = {
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53 [SYS_DIR_BIN] = MOLKO_BINDIR,
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54 [SYS_DIR_DATA] = MOLKO_DATADIR,
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55 [SYS_DIR_LOCALE] = MOLKO_LOCALEDIR
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56 };
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57
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58 static const char *abspaths[] = {
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59 [SYS_DIR_BIN] = MOLKO_ABS_BINDIR,
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60 [SYS_DIR_DATA] = MOLKO_ABS_DATADIR,
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61 [SYS_DIR_LOCALE] = MOLKO_ABS_LOCALEDIR
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62 };
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63
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64 #if defined(_WIN32)
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65
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66 static bool
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67 is_absolute(const char *path)
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68 {
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69 return !PathIsRelativeA(path);
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70 }
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71
241
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72 #else
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73
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74 static bool
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75 is_absolute(const char *path)
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76 {
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77 return path[0] == '/';
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78 }
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79
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80 #endif
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81
241
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82 static char *
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83 normalize(char *str)
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84 {
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85 for (char *p = str; *p; ++p)
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86 if (*p == '\\')
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87 *p = '/';
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88
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89 return str;
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90 }
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91
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92 bool
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93 sys_init(const char *organization, const char *name)
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94 {
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95 #if defined(__MINGW64__)
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96 /* On MinGW buffering leads to painful debugging. */
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97 setbuf(stderr, NULL);
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98 setbuf(stdout, NULL);
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99 #endif
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100
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101 strlcpy(info.organization, organization, sizeof (info.organization));
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102 strlcpy(info.name, name, sizeof (info.name));
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103
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104 if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
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105 return errorf("%s", SDL_GetError());
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106 if (IMG_Init(IMG_INIT_PNG) != IMG_INIT_PNG)
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107 return errorf("%s", SDL_GetError());
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108 if (TTF_Init() < 0)
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109 return errorf("%s", SDL_GetError());
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110 if (Mix_Init(MIX_INIT_OGG) != MIX_INIT_OGG)
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111 return errorf("%s", SDL_GetError());
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112 if (Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 4096) < 0)
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113 return errorf("%s", SDL_GetError());
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114
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115 Mix_AllocateChannels(SOUND_CHANNELS_MAX);
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116
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117 return true;
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118 }
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119
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120 static const char *
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121 absolute(const char *which)
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122 {
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123 static char path[PATH_MAX];
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124
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125 strlcpy(path, which, sizeof (path));
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126
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127 return normalize(path);
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128 }
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129
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130 static const char *
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131 system_directory(enum sys_dir kind)
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132 {
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133 static char path[PATH_MAX];
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134 static char ret[PATH_MAX];
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135 char *base, *binsect;
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136
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137 /* 1. Get current binary directory. */
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138 base = SDL_GetBasePath();
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139
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140 /*
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141 * 2. Decompose the path to the given special directory by computing
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142 * relative directory to it from where the binary is located.
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143 *
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144 * Example:
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145 * PREFIX/bin/mlk
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146 * PREFIX/share/molko
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147 *
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148 * The path to the data is ../share/molko starting from the binary.
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149 *
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150 * If path to binary is absolute we can't determine relative paths to
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151 * any other directory and use the absolute one instead.
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152 *
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153 * Also, on some platforms SDL_GetBasePath isn't implemented and returns
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154 * NULL, in that case return the fallback to the installation prefix.
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155 */
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156 if (is_absolute(paths[SYS_DIR_BIN]) || is_absolute(paths[kind]) || !base)
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157 return absolute(abspaths[kind]);
32
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158
241
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159 /*
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160 * 3. Put the base path into the path and remove the value of
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161 * MOLKO_BINDIR.
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162 *
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163 * Example:
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164 * from: /usr/local/bin
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165 * to: /usr/local
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166 */
258
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167 strlcpy(path, base, sizeof (path));
241
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168 SDL_free(base);
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169
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170 if ((binsect = strstr(path, paths[SYS_DIR_BIN])))
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171 *binsect = '\0';
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172
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173 /* 4. For data directories, we append the program name. */
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174 if (kind == SYS_DIR_DATA)
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175 snprintf(ret, sizeof (ret), "%s%s/%s", path, paths[kind], info.name);
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176 else
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177 snprintf(ret, sizeof (ret), "%s%s", path, paths[kind]);
32
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178
241
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179 return normalize(ret);
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180 }
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181
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182 static const char *
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183 user_directory(enum sys_dir kind)
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184 {
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185 /* Kept for future use. */
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186 (void)kind;
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187
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188 static char path[PATH_MAX];
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189 char *pref;
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190
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191 if ((pref = SDL_GetPrefPath(info.organization, info.name))) {
258
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diff changeset
192 strlcpy(path, pref, sizeof (path));
241
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193 SDL_free(pref);
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194 } else
258
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195 strlcpy(path, "./", sizeof (path));
241
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196
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197 return NULL;
32
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198 }
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199
255
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200 static bool
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201 mkpath(const char *path)
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202 {
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203 #ifdef _WIN32
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204 /* TODO: add error using the convenient FormatMessage function. */
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205 if (!CreateDirectoryA(path, NULL) && GetLastError() != ERROR_ALREADY_EXISTS)
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206 return errorf("unable to create directory: %s", path);
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207 #else
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208 if (mkdir(path, 0755) < 0 && errno != EEXIST)
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209 return errorf("%s", strerror(errno));
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210 #endif
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211
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212 return true;
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213 }
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214
32
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215 const char *
241
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216 sys_dir(enum sys_dir kind)
32
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217 {
241
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218 switch (kind) {
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219 case SYS_DIR_BIN:
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diff changeset
220 case SYS_DIR_DATA:
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diff changeset
221 case SYS_DIR_LOCALE:
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222 return system_directory(kind);
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223 default:
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224 return user_directory(kind);
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225 }
84
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226 }
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diff changeset
227
255
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diff changeset
228 bool
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229 sys_mkdir(const char *directory)
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230 {
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diff changeset
231 char path[PATH_MAX], *p;
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diff changeset
232
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233 /* Copy the directory to normalize and iterate over '/'. */
258
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234 strlcpy(path, directory, sizeof (path));
255
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diff changeset
235 normalize(path);
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236
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diff changeset
237 #if defined(_WIN32)
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diff changeset
238 /* Remove drive letter that we don't need. */
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diff changeset
239 if ((p = strchr(path, ':')))
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diff changeset
240 ++p;
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parents: 243
diff changeset
241 else
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diff changeset
242 p = path;
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diff changeset
243 #else
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diff changeset
244 p = path;
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diff changeset
245 #endif
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parents: 243
diff changeset
246
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David Demelier <markand@malikania.fr>
parents: 243
diff changeset
247 for (p = p + 1; *p; ++p) {
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diff changeset
248 if (*p == '/') {
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parents: 243
diff changeset
249 *p = 0;
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diff changeset
250
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David Demelier <markand@malikania.fr>
parents: 243
diff changeset
251 if (!mkpath(path))
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diff changeset
252 return false;
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diff changeset
253
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diff changeset
254 *p = '/';
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diff changeset
255 }
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parents: 243
diff changeset
256 }
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parents: 243
diff changeset
257
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258 return mkpath(path);
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parents: 243
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259 }
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parents: 243
diff changeset
260
23
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parents:
diff changeset
261 void
97
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parents: 87
diff changeset
262 sys_finish(void)
23
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parents:
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263 {
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parents:
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264 Mix_Quit();
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parents:
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265 TTF_Quit();
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parents:
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266 IMG_Quit();
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parents:
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267 SDL_Quit();
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parents:
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268 }