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annotate src/core/sys.c @ 87:ebbf35d90088

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misc: fix several portability issues
author David Demelier <markand@malikania.fr>
date Wed, 11 Mar 2020 20:36:10 +0100
parents a6c2067709ce
children 58133933ea17
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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
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19 #include <assert.h>
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20 #include <stdio.h>
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21 #include <stdlib.h>
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22 #include <limits.h>
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23
23
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24 #include <SDL.h>
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25 #include <SDL_image.h>
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26 #include <SDL_mixer.h>
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27 #include <SDL_ttf.h>
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28
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29 #if !defined(_WIN32) /* Assuming POSIX */
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30 # include <sys/types.h>
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31 # include <dirent.h>
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32 #endif
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33
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34 #include "error.h"
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35 #include "error_p.h"
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36 #include "sys.h"
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37
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38 #if defined(_WIN32)
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39
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40 static void
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41 determine(char path[], size_t pathlen)
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42 {
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43 char *base = SDL_GetBasePath();
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44
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45 /* On Windows, the data hierarchy is the same as the project. */
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46 snprintf(path, pathlen, "%sassets", base);
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47 SDL_free(base);
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48 }
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49
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50 #else /* Assuming POSIX */
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51
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52 static bool
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53 is_absolute(const char *path)
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54 {
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55 assert(path);
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57 return path[0] == '/';
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58 }
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59
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60 static void
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61 determine(char path[], size_t pathlen)
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62 {
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63 char localassets[PATH_MAX];
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64 char *base = SDL_GetBasePath();
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65 DIR *dp;
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66
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67 /* Try assets directory where executable lives. */
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68 snprintf(localassets, sizeof (localassets), "%sassets", base);
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69
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70 if ((dp = opendir(localassets))) {
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71 snprintf(path, pathlen, "%sassets", base);
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72 closedir(dp);
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73 } else {
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74 /* We are not in the project source directory. */
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75 if (is_absolute(SHAREDIR)) {
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76 /* SHAREDIR is absolute */
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77 snprintf(path, pathlen, "%s/molko", SHAREDIR);
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78 } else if (is_absolute(BINDIR)) {
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79 /* SHAREDIR is relative but BINDIR is absolute */
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80 snprintf(path, pathlen, "%s/%s/molko", PREFIX, SHAREDIR);
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81 } else {
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82 /* SHAREDIR, BINDIR are both relative */
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83 char *ptr = strstr(base, BINDIR);
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85 if (ptr) {
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86 *ptr = '\0';
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87 snprintf(path, pathlen, "%s%s/molko", base, SHAREDIR);
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88 } else {
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89 /* Unable to determine. */
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90 snprintf(path, pathlen, ".");
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91 }
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92 }
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93 }
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94
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95 SDL_free(base);
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96 }
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97
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98 #endif
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99
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100 bool
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101 sys_init(void)
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102 {
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103 #if defined(__MINGW64__)
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104 /* On MinGW buffering leads to painful debugging. */
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105 setbuf(stderr, NULL);
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106 setbuf(stdout, NULL);
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107 #endif
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108
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109 if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
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110 return error_sdl();
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111 if (IMG_Init(IMG_INIT_PNG) != IMG_INIT_PNG)
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112 return error_sdl();
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113 if (TTF_Init() < 0)
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114 return error_sdl();
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115 if (Mix_Init(MIX_INIT_OGG) != MIX_INIT_OGG)
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116 return error_sdl();
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117
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118 return true;
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119 }
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120
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121 const char *
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122 sys_datadir(void)
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123 {
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124 static char path[PATH_MAX];
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125
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126 if (path[0] == '\0')
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127 determine(path, sizeof (path));
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128
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129 return path;
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130 }
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131
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132 const char *
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133 sys_datapath(const char *fmt, ...)
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134 {
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135 const char *ret;
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136 va_list ap;
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137
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138 va_start(ap, fmt);
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139 ret = sys_datapathv(fmt, ap);
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140 va_end(ap);
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141
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142 return ret;
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143 }
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144
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145 const char *
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146 sys_datapathv(const char *fmt, va_list ap)
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147 {
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148 static char path[PATH_MAX];
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149 char filename[FILENAME_MAX];
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150
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151 vsnprintf(filename, sizeof (filename), fmt, ap);
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152 snprintf(path, sizeof (path), "%s/%s", sys_datadir(), filename);
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153
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154 return path;
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155 }
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156
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157 const char *
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158 sys_savepath(unsigned int idx)
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159 {
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160 static char path[PATH_MAX];
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161 char *pref;
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162
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163 if ((pref = SDL_GetPrefPath("malikania", "molko"))) {
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164 snprintf(path, sizeof (path), "%ssave-%u", pref, idx);
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165 SDL_free(pref);
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166 } else
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167 snprintf(path, sizeof (path), "save-%u", idx);
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168
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169 return path;
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170 }
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171
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172 void
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173 sys_close(void)
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174 {
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175 Mix_Quit();
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176 TTF_Quit();
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177 IMG_Quit();
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178 SDL_Quit();
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179 }