1 /* |
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2 * Posix-esque support routines for PhysicsFS. |
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3 * |
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4 * Please see the file LICENSE.txt in the source's root directory. |
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5 * |
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6 * This file written by Ryan C. Gordon. |
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7 */ |
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8 |
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9 /* !!! FIXME: check for EINTR? */ |
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10 |
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11 #define __PHYSICSFS_INTERNAL__ |
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12 #include "physfs_platforms.h" |
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13 |
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14 #ifdef PHYSFS_PLATFORM_POSIX |
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15 |
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16 #include <unistd.h> |
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17 #include <ctype.h> |
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18 #include <sys/types.h> |
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19 #include <sys/stat.h> |
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20 #include <pwd.h> |
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21 #include <dirent.h> |
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22 #include <errno.h> |
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23 #include <fcntl.h> |
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24 |
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25 #if ((!defined PHYSFS_NO_THREAD_SUPPORT) && (!defined PHYSFS_PLATFORM_BEOS)) |
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26 #include <pthread.h> |
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27 #endif |
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28 |
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29 #include "physfs_internal.h" |
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30 |
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31 |
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32 static PHYSFS_ErrorCode errcodeFromErrnoError(const int err) |
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33 { |
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34 switch (err) |
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35 { |
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36 case 0: return PHYSFS_ERR_OK; |
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37 case EACCES: return PHYSFS_ERR_PERMISSION; |
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38 case EPERM: return PHYSFS_ERR_PERMISSION; |
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39 case EDQUOT: return PHYSFS_ERR_NO_SPACE; |
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40 case EIO: return PHYSFS_ERR_IO; |
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41 case ELOOP: return PHYSFS_ERR_SYMLINK_LOOP; |
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42 case EMLINK: return PHYSFS_ERR_NO_SPACE; |
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43 case ENAMETOOLONG: return PHYSFS_ERR_BAD_FILENAME; |
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44 case ENOENT: return PHYSFS_ERR_NOT_FOUND; |
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45 case ENOSPC: return PHYSFS_ERR_NO_SPACE; |
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46 case ENOTDIR: return PHYSFS_ERR_NOT_FOUND; |
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47 case EISDIR: return PHYSFS_ERR_NOT_A_FILE; |
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48 case EROFS: return PHYSFS_ERR_READ_ONLY; |
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49 case ETXTBSY: return PHYSFS_ERR_BUSY; |
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50 case EBUSY: return PHYSFS_ERR_BUSY; |
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51 case ENOMEM: return PHYSFS_ERR_OUT_OF_MEMORY; |
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52 case ENOTEMPTY: return PHYSFS_ERR_DIR_NOT_EMPTY; |
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53 default: return PHYSFS_ERR_OS_ERROR; |
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54 } /* switch */ |
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55 } /* errcodeFromErrnoError */ |
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56 |
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57 |
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58 static inline PHYSFS_ErrorCode errcodeFromErrno(void) |
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59 { |
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60 return errcodeFromErrnoError(errno); |
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61 } /* errcodeFromErrno */ |
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62 |
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63 |
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64 static char *getUserDirByUID(void) |
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65 { |
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66 uid_t uid = getuid(); |
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67 struct passwd *pw; |
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68 char *retval = NULL; |
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69 |
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70 pw = getpwuid(uid); |
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71 if ((pw != NULL) && (pw->pw_dir != NULL) && (*pw->pw_dir != '\0')) |
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72 { |
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73 const size_t dlen = strlen(pw->pw_dir); |
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74 const size_t add_dirsep = (pw->pw_dir[dlen-1] != '/') ? 1 : 0; |
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75 retval = (char *) allocator.Malloc(dlen + 1 + add_dirsep); |
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76 if (retval != NULL) |
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77 { |
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78 strcpy(retval, pw->pw_dir); |
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79 if (add_dirsep) |
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80 { |
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81 retval[dlen] = '/'; |
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82 retval[dlen+1] = '\0'; |
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83 } /* if */ |
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84 } /* if */ |
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85 } /* if */ |
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86 |
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87 return retval; |
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88 } /* getUserDirByUID */ |
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89 |
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90 |
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91 char *__PHYSFS_platformCalcUserDir(void) |
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92 { |
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93 char *retval = NULL; |
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94 char *envr = getenv("HOME"); |
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95 |
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96 /* if the environment variable was set, make sure it's really a dir. */ |
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97 if (envr != NULL) |
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98 { |
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99 struct stat statbuf; |
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100 if ((stat(envr, &statbuf) != -1) && (S_ISDIR(statbuf.st_mode))) |
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101 { |
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102 const size_t envrlen = strlen(envr); |
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103 const size_t add_dirsep = (envr[envrlen-1] != '/') ? 1 : 0; |
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104 retval = allocator.Malloc(envrlen + 1 + add_dirsep); |
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105 if (retval) |
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106 { |
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107 strcpy(retval, envr); |
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108 if (add_dirsep) |
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109 { |
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110 retval[envrlen] = '/'; |
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111 retval[envrlen+1] = '\0'; |
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112 } /* if */ |
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113 } /* if */ |
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114 } /* if */ |
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115 } /* if */ |
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116 |
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117 if (retval == NULL) |
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118 retval = getUserDirByUID(); |
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119 |
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120 return retval; |
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121 } /* __PHYSFS_platformCalcUserDir */ |
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122 |
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123 |
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124 void __PHYSFS_platformEnumerateFiles(const char *dirname, |
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125 PHYSFS_EnumFilesCallback callback, |
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126 const char *origdir, |
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127 void *callbackdata) |
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128 { |
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129 DIR *dir; |
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130 struct dirent *ent; |
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131 char *buf = NULL; |
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132 |
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133 errno = 0; |
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134 dir = opendir(dirname); |
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135 if (dir == NULL) |
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136 { |
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137 allocator.Free(buf); |
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138 return; |
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139 } /* if */ |
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140 |
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141 while ((ent = readdir(dir)) != NULL) |
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142 { |
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143 if (strcmp(ent->d_name, ".") == 0) |
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144 continue; |
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145 else if (strcmp(ent->d_name, "..") == 0) |
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146 continue; |
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147 |
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148 callback(callbackdata, origdir, ent->d_name); |
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149 } /* while */ |
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150 |
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151 allocator.Free(buf); |
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152 closedir(dir); |
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153 } /* __PHYSFS_platformEnumerateFiles */ |
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154 |
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155 |
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156 int __PHYSFS_platformMkDir(const char *path) |
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157 { |
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158 const int rc = mkdir(path, S_IRWXU); |
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159 BAIL_IF_MACRO(rc == -1, errcodeFromErrno(), 0); |
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160 return 1; |
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161 } /* __PHYSFS_platformMkDir */ |
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162 |
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163 |
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164 static void *doOpen(const char *filename, int mode) |
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165 { |
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166 const int appending = (mode & O_APPEND); |
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167 int fd; |
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168 int *retval; |
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169 errno = 0; |
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170 |
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171 /* O_APPEND doesn't actually behave as we'd like. */ |
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172 mode &= ~O_APPEND; |
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173 |
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174 fd = open(filename, mode, S_IRUSR | S_IWUSR); |
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175 BAIL_IF_MACRO(fd < 0, errcodeFromErrno(), NULL); |
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176 |
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177 if (appending) |
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178 { |
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179 if (lseek(fd, 0, SEEK_END) < 0) |
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180 { |
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181 const int err = errno; |
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182 close(fd); |
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183 BAIL_MACRO(errcodeFromErrnoError(err), NULL); |
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184 } /* if */ |
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185 } /* if */ |
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186 |
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187 retval = (int *) allocator.Malloc(sizeof (int)); |
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188 if (!retval) |
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189 { |
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190 close(fd); |
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191 BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL); |
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192 } /* if */ |
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193 |
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194 *retval = fd; |
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195 return ((void *) retval); |
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196 } /* doOpen */ |
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197 |
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198 |
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199 void *__PHYSFS_platformOpenRead(const char *filename) |
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200 { |
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201 return doOpen(filename, O_RDONLY); |
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202 } /* __PHYSFS_platformOpenRead */ |
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203 |
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204 |
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205 void *__PHYSFS_platformOpenWrite(const char *filename) |
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206 { |
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207 return doOpen(filename, O_WRONLY | O_CREAT | O_TRUNC); |
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208 } /* __PHYSFS_platformOpenWrite */ |
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209 |
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210 |
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211 void *__PHYSFS_platformOpenAppend(const char *filename) |
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212 { |
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213 return doOpen(filename, O_WRONLY | O_CREAT | O_APPEND); |
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214 } /* __PHYSFS_platformOpenAppend */ |
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215 |
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216 |
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217 PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer, |
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218 PHYSFS_uint64 len) |
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219 { |
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220 const int fd = *((int *) opaque); |
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221 ssize_t rc = 0; |
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222 |
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223 if (!__PHYSFS_ui64FitsAddressSpace(len)) |
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224 BAIL_MACRO(PHYSFS_ERR_INVALID_ARGUMENT, -1); |
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225 |
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226 rc = read(fd, buffer, (size_t) len); |
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227 BAIL_IF_MACRO(rc == -1, errcodeFromErrno(), -1); |
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228 assert(rc >= 0); |
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229 assert(rc <= len); |
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230 return (PHYSFS_sint64) rc; |
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231 } /* __PHYSFS_platformRead */ |
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232 |
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233 |
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234 PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer, |
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235 PHYSFS_uint64 len) |
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236 { |
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237 const int fd = *((int *) opaque); |
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238 ssize_t rc = 0; |
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239 |
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240 if (!__PHYSFS_ui64FitsAddressSpace(len)) |
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241 BAIL_MACRO(PHYSFS_ERR_INVALID_ARGUMENT, -1); |
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242 |
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243 rc = write(fd, (void *) buffer, (size_t) len); |
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244 BAIL_IF_MACRO(rc == -1, errcodeFromErrno(), rc); |
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245 assert(rc >= 0); |
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246 assert(rc <= len); |
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247 return (PHYSFS_sint64) rc; |
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248 } /* __PHYSFS_platformWrite */ |
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249 |
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250 |
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251 int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos) |
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252 { |
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253 const int fd = *((int *) opaque); |
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254 const int rc = lseek(fd, (off_t) pos, SEEK_SET); |
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255 BAIL_IF_MACRO(rc == -1, errcodeFromErrno(), 0); |
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256 return 1; |
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257 } /* __PHYSFS_platformSeek */ |
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258 |
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259 |
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260 PHYSFS_sint64 __PHYSFS_platformTell(void *opaque) |
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261 { |
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262 const int fd = *((int *) opaque); |
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263 PHYSFS_sint64 retval; |
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264 retval = (PHYSFS_sint64) lseek(fd, 0, SEEK_CUR); |
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265 BAIL_IF_MACRO(retval == -1, errcodeFromErrno(), -1); |
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266 return retval; |
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267 } /* __PHYSFS_platformTell */ |
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268 |
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269 |
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270 PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque) |
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271 { |
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272 const int fd = *((int *) opaque); |
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273 struct stat statbuf; |
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274 BAIL_IF_MACRO(fstat(fd, &statbuf) == -1, errcodeFromErrno(), -1); |
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275 return ((PHYSFS_sint64) statbuf.st_size); |
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276 } /* __PHYSFS_platformFileLength */ |
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277 |
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278 |
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279 int __PHYSFS_platformFlush(void *opaque) |
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280 { |
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281 const int fd = *((int *) opaque); |
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282 if ((fcntl(fd, F_GETFL) & O_ACCMODE) != O_RDONLY) |
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283 BAIL_IF_MACRO(fsync(fd) == -1, errcodeFromErrno(), 0); |
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284 return 1; |
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285 } /* __PHYSFS_platformFlush */ |
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286 |
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287 |
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288 void __PHYSFS_platformClose(void *opaque) |
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289 { |
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290 const int fd = *((int *) opaque); |
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291 (void) close(fd); /* we don't check this. You should have used flush! */ |
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292 allocator.Free(opaque); |
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293 } /* __PHYSFS_platformClose */ |
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294 |
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295 |
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296 int __PHYSFS_platformDelete(const char *path) |
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297 { |
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298 BAIL_IF_MACRO(remove(path) == -1, errcodeFromErrno(), 0); |
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299 return 1; |
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300 } /* __PHYSFS_platformDelete */ |
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301 |
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302 |
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303 int __PHYSFS_platformStat(const char *filename, PHYSFS_Stat *st) |
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304 { |
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305 struct stat statbuf; |
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306 |
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307 BAIL_IF_MACRO(lstat(filename, &statbuf) == -1, errcodeFromErrno(), 0); |
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308 |
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309 if (S_ISREG(statbuf.st_mode)) |
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310 { |
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311 st->filetype = PHYSFS_FILETYPE_REGULAR; |
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312 st->filesize = statbuf.st_size; |
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313 } /* if */ |
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314 |
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315 else if(S_ISDIR(statbuf.st_mode)) |
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316 { |
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317 st->filetype = PHYSFS_FILETYPE_DIRECTORY; |
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318 st->filesize = 0; |
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319 } /* else if */ |
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320 |
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321 else if(S_ISLNK(statbuf.st_mode)) |
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322 { |
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323 st->filetype = PHYSFS_FILETYPE_SYMLINK; |
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324 st->filesize = 0; |
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325 } /* else if */ |
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326 |
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327 else |
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328 { |
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329 st->filetype = PHYSFS_FILETYPE_OTHER; |
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330 st->filesize = statbuf.st_size; |
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331 } /* else */ |
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332 |
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333 st->modtime = statbuf.st_mtime; |
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334 st->createtime = statbuf.st_ctime; |
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335 st->accesstime = statbuf.st_atime; |
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336 |
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337 /* !!! FIXME: maybe we should just report full permissions? */ |
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338 st->readonly = access(filename, W_OK); |
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339 return 1; |
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340 } /* __PHYSFS_platformStat */ |
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341 |
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342 |
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343 #ifndef PHYSFS_PLATFORM_BEOS /* BeOS has its own code in platform_beos.cpp */ |
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344 #if (defined PHYSFS_NO_THREAD_SUPPORT) |
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345 |
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346 void *__PHYSFS_platformGetThreadID(void) { return ((void *) 0x0001); } |
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347 void *__PHYSFS_platformCreateMutex(void) { return ((void *) 0x0001); } |
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348 void __PHYSFS_platformDestroyMutex(void *mutex) {} |
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349 int __PHYSFS_platformGrabMutex(void *mutex) { return 1; } |
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350 void __PHYSFS_platformReleaseMutex(void *mutex) {} |
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351 |
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352 #else |
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353 |
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354 typedef struct |
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355 { |
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356 pthread_mutex_t mutex; |
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357 pthread_t owner; |
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358 PHYSFS_uint32 count; |
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359 } PthreadMutex; |
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360 |
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361 |
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362 void *__PHYSFS_platformGetThreadID(void) |
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363 { |
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364 return ( (void *) ((size_t) pthread_self()) ); |
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365 } /* __PHYSFS_platformGetThreadID */ |
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366 |
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367 |
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368 void *__PHYSFS_platformCreateMutex(void) |
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369 { |
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370 int rc; |
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371 PthreadMutex *m = (PthreadMutex *) allocator.Malloc(sizeof (PthreadMutex)); |
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372 BAIL_IF_MACRO(!m, PHYSFS_ERR_OUT_OF_MEMORY, NULL); |
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373 rc = pthread_mutex_init(&m->mutex, NULL); |
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374 if (rc != 0) |
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375 { |
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376 allocator.Free(m); |
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377 BAIL_MACRO(PHYSFS_ERR_OS_ERROR, NULL); |
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378 } /* if */ |
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379 |
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380 m->count = 0; |
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381 m->owner = (pthread_t) 0xDEADBEEF; |
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382 return ((void *) m); |
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383 } /* __PHYSFS_platformCreateMutex */ |
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384 |
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385 |
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386 void __PHYSFS_platformDestroyMutex(void *mutex) |
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387 { |
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388 PthreadMutex *m = (PthreadMutex *) mutex; |
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389 |
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390 /* Destroying a locked mutex is a bug, but we'll try to be helpful. */ |
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391 if ((m->owner == pthread_self()) && (m->count > 0)) |
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392 pthread_mutex_unlock(&m->mutex); |
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393 |
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394 pthread_mutex_destroy(&m->mutex); |
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395 allocator.Free(m); |
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396 } /* __PHYSFS_platformDestroyMutex */ |
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397 |
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398 |
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399 int __PHYSFS_platformGrabMutex(void *mutex) |
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400 { |
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401 PthreadMutex *m = (PthreadMutex *) mutex; |
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402 pthread_t tid = pthread_self(); |
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403 if (m->owner != tid) |
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404 { |
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405 if (pthread_mutex_lock(&m->mutex) != 0) |
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406 return 0; |
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407 m->owner = tid; |
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408 } /* if */ |
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409 |
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410 m->count++; |
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411 return 1; |
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412 } /* __PHYSFS_platformGrabMutex */ |
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413 |
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414 |
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415 void __PHYSFS_platformReleaseMutex(void *mutex) |
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416 { |
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417 PthreadMutex *m = (PthreadMutex *) mutex; |
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418 assert(m->owner == pthread_self()); /* catch programming errors. */ |
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419 assert(m->count > 0); /* catch programming errors. */ |
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420 if (m->owner == pthread_self()) |
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421 { |
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422 if (--m->count == 0) |
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423 { |
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424 m->owner = (pthread_t) 0xDEADBEEF; |
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425 pthread_mutex_unlock(&m->mutex); |
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426 } /* if */ |
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427 } /* if */ |
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428 } /* __PHYSFS_platformReleaseMutex */ |
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429 |
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430 #endif /* !PHYSFS_NO_THREAD_SUPPORT */ |
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431 #endif /* !PHYSFS_PLATFORM_BEOS */ |
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432 |
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433 #endif /* PHYSFS_PLATFORM_POSIX */ |
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434 |
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435 /* end of posix.c ... */ |
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436 |
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