1 | /*
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2 | ** file.c - File class
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3 | */
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4 |
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5 | #include "mruby.h"
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6 | #include "mruby/class.h"
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7 | #include "mruby/data.h"
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8 | #include "mruby/string.h"
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9 | #include "mruby/ext/io.h"
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10 |
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11 | #if MRUBY_RELEASE_NO < 10000
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12 | #include "error.h"
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13 | #else
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14 | #include "mruby/error.h"
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15 | #endif
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16 |
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17 | #include <sys/types.h>
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18 | #include <sys/stat.h>
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19 |
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20 | #include <fcntl.h>
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21 | #include <limits.h>
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22 |
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23 | #include <errno.h>
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24 | #include <stdlib.h>
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25 | #include <string.h>
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26 | #if defined(_WIN32) || defined(_WIN64)
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27 | #define NULL_FILE "NUL"
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28 | #define UNLINK _unlink
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29 | #define GETCWD _getcwd
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30 | #define CHMOD(a, b) 0
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31 | #define MAXPATHLEN 1024
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32 | #if !defined(PATH_MAX)
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33 | #define PATH_MAX _MAX_PATH
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34 | #endif
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35 | #define realpath(N,R) _fullpath((R),(N),_MAX_PATH)
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36 | #include <direct.h>
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37 | #else
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38 | #define NULL_FILE "/dev/null"
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39 | #include <unistd.h>
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40 | #define UNLINK unlink
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41 | #define GETCWD getcwd
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42 | #define CHMOD(a, b) chmod(a,b)
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43 | #include <sys/file.h>
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44 | #include <libgen.h>
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45 | #include <sys/param.h>
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46 | #include <pwd.h>
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47 | #endif
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48 | #if defined(__NEWLIB__)
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49 | #define _MAX_DIR 253
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50 | #define _MAX_DRIVE 2
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51 | #define PATH_MAX (_MAX_DRIVE + _MAX_DIR)
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52 | #define MAXPATHLEN (_MAX_DRIVE + _MAX_DIR)
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53 | #endif
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54 |
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55 | #define FILE_SEPARATOR "/"
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56 |
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57 | #if defined(_WIN32) || defined(_WIN64)
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58 | #define PATH_SEPARATOR ";"
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59 | #define FILE_ALT_SEPARATOR "\\"
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60 | #else
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61 | #define PATH_SEPARATOR ":"
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62 | #endif
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63 |
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64 | #ifndef LOCK_SH
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65 | #define LOCK_SH 1
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66 | #endif
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67 | #ifndef LOCK_EX
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68 | #define LOCK_EX 2
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69 | #endif
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70 | #ifndef LOCK_NB
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71 | #define LOCK_NB 4
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72 | #endif
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73 | #ifndef LOCK_UN
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74 | #define LOCK_UN 8
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75 | #endif
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76 |
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77 | #define STAT(p, s) stat(p, s)
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78 |
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79 |
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80 | mrb_value
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81 | mrb_file_s_umask(mrb_state *mrb, mrb_value klass)
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82 | {
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83 | #if defined(_WIN32) || defined(_WIN64) || defined(__NEWLIB__)
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84 | /* nothing to do on windows */
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85 | return mrb_fixnum_value(0);
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86 |
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87 | #else
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88 | mrb_int mask, omask;
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89 | if (mrb_get_args(mrb, "|i", &mask) == 0) {
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90 | omask = umask(0);
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91 | umask(omask);
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92 | } else {
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93 | omask = umask(mask);
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94 | }
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95 | return mrb_fixnum_value(omask);
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96 | #endif
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97 | }
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98 |
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99 | static mrb_value
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100 | mrb_file_s_unlink(mrb_state *mrb, mrb_value obj)
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101 | {
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102 | mrb_value *argv;
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103 | mrb_value pathv;
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104 | mrb_int argc, i;
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105 | const char *path;
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106 |
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107 | mrb_get_args(mrb, "*", &argv, &argc);
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108 | for (i = 0; i < argc; i++) {
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109 | pathv = mrb_convert_type(mrb, argv[i], MRB_TT_STRING, "String", "to_str");
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110 | path = mrb_string_value_cstr(mrb, &pathv);
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111 | if (UNLINK(path) < 0) {
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112 | mrb_sys_fail(mrb, path);
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113 | }
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114 | }
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115 | return mrb_fixnum_value(argc);
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116 | }
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117 |
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118 | static mrb_value
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119 | mrb_file_s_rename(mrb_state *mrb, mrb_value obj)
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120 | {
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121 | mrb_value from, to;
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122 | const char *src, *dst;
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123 |
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124 | mrb_get_args(mrb, "SS", &from, &to);
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125 | src = mrb_string_value_cstr(mrb, &from);
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126 | dst = mrb_string_value_cstr(mrb, &to);
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127 | if (rename(src, dst) < 0) {
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128 | if (CHMOD(dst, 0666) == 0 && UNLINK(dst) == 0 && rename(src, dst) == 0) {
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129 | return mrb_fixnum_value(0);
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130 | }
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131 | mrb_sys_fail(mrb, mrb_str_to_cstr(mrb, mrb_format(mrb, "(%S, %S)", from, to)));
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132 | }
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133 | return mrb_fixnum_value(0);
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134 | }
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135 |
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136 | static mrb_value
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137 | mrb_file_dirname(mrb_state *mrb, mrb_value klass)
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138 | {
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139 | #if defined(_WIN32) || defined(_WIN64)
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140 | char dname[_MAX_DIR], vname[_MAX_DRIVE];
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141 | char buffer[_MAX_DRIVE + _MAX_DIR];
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142 | char *path;
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143 | size_t ridx;
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144 | mrb_value s;
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145 | mrb_get_args(mrb, "S", &s);
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146 | path = mrb_str_to_cstr(mrb, s);
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147 | _splitpath((const char*)path, vname, dname, NULL, NULL);
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148 | snprintf(buffer, _MAX_DRIVE + _MAX_DIR, "%s%s", vname, dname);
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149 | ridx = strlen(buffer);
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150 | if (ridx == 0) {
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151 | strncpy(buffer, ".", 2); /* null terminated */
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152 | } else if (ridx > 1) {
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153 | ridx--;
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154 | while (ridx > 0 && (buffer[ridx] == '/' || buffer[ridx] == '\\')) {
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155 | buffer[ridx] = '\0'; /* remove last char */
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156 | ridx--;
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157 | }
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158 | }
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159 | return mrb_str_new_cstr(mrb, buffer);
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160 | #else
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161 | char *dname, *path;
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162 | mrb_value s;
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163 | mrb_get_args(mrb, "S", &s);
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164 | path = mrb_str_to_cstr(mrb, s);
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165 |
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166 | if ((dname = dirname(path)) == NULL) {
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167 | mrb_sys_fail(mrb, "dirname");
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168 | }
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169 | #endif
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170 | return mrb_str_new_cstr(mrb, dname);
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171 | }
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172 |
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173 | static mrb_value
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174 | mrb_file_basename(mrb_state *mrb, mrb_value klass)
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175 | {
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176 | #if defined(_WIN32) || defined(_WIN64)
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177 | char bname[_MAX_DIR];
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178 | char extname[_MAX_EXT];
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179 | char *path;
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180 | size_t ridx;
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181 | char buffer[_MAX_DIR + _MAX_EXT];
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182 | mrb_value s;
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183 | mrb_get_args(mrb, "S", &s);
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184 | path = mrb_str_to_cstr(mrb, s);
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185 | ridx = strlen(path);
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186 | if (ridx > 0) {
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187 | ridx--;
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188 | while (ridx > 0 && (path[ridx] == '/' || path[ridx] == '\\')) {
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189 | path[ridx] = '\0';
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190 | ridx--;
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191 | }
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192 | if (strncmp(path, "/", 2) == 0) {
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193 | return mrb_str_new_cstr(mrb, path);
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194 | }
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195 | }
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196 | _splitpath((const char*)path, NULL, NULL, bname, extname);
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197 | snprintf(buffer, _MAX_DIR + _MAX_EXT, "%s%s", bname, extname);
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198 | return mrb_str_new_cstr(mrb, buffer);
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199 | #else
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200 | char *bname, *path;
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201 | mrb_value s;
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202 | mrb_get_args(mrb, "S", &s);
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203 | path = mrb_str_to_cstr(mrb, s);
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204 | if ((bname = basename(path)) == NULL) {
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205 | mrb_sys_fail(mrb, "basename");
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206 | }
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207 | return mrb_str_new_cstr(mrb, bname);
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208 | #endif
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209 | }
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210 |
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211 | static mrb_value
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212 | mrb_file_realpath(mrb_state *mrb, mrb_value klass)
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213 | {
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214 | mrb_value pathname, dir_string, s, result;
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215 | int argc;
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216 | char *cpath;
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217 |
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218 | argc = mrb_get_args(mrb, "S|S", &pathname, &dir_string);
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219 | if (argc == 2) {
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220 | s = mrb_str_dup(mrb, dir_string);
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221 | s = mrb_str_append(mrb, s, mrb_str_new_cstr(mrb, FILE_SEPARATOR));
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222 | s = mrb_str_append(mrb, s, pathname);
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223 | pathname = s;
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224 | }
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225 | cpath = mrb_str_to_cstr(mrb, pathname);
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226 | result = mrb_str_buf_new(mrb, PATH_MAX);
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227 | if (realpath(cpath, RSTRING_PTR(result)) == NULL)
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228 | mrb_sys_fail(mrb, cpath);
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229 | mrb_str_resize(mrb, result, strlen(RSTRING_PTR(result)));
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230 | return result;
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231 | }
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232 |
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233 | mrb_value
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234 | mrb_file__getwd(mrb_state *mrb, mrb_value klass)
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235 | {
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236 | mrb_value path;
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237 |
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238 | path = mrb_str_buf_new(mrb, MAXPATHLEN);
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239 | if (GETCWD(RSTRING_PTR(path), MAXPATHLEN) == NULL) {
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240 | mrb_sys_fail(mrb, "getcwd(2)");
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241 | }
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242 | mrb_str_resize(mrb, path, strlen(RSTRING_PTR(path)));
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243 | return path;
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244 | }
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245 |
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246 | static int
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247 | mrb_file_is_absolute_path(const char *path)
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248 | {
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249 | return (path[0] == '/');
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250 | }
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251 |
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252 | static mrb_value
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253 | mrb_file__gethome(mrb_state *mrb, mrb_value klass)
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254 | {
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255 | #if !defined(_WIN32) && !defined(_WIN64) && !defined(__NEWLIB__)
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256 | mrb_value username;
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257 | int argc;
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258 | char *home;
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259 |
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260 | argc = mrb_get_args(mrb, "|S", &username);
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261 | if (argc == 0) {
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262 | home = getenv("HOME");
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263 | if (home == NULL) {
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264 | return mrb_nil_value();
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265 | }
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266 | if (!mrb_file_is_absolute_path(home)) {
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267 | mrb_raise(mrb, E_ARGUMENT_ERROR, "non-absolute home");
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268 | }
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269 | } else {
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270 | const char *cuser = mrb_str_to_cstr(mrb, username);
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271 | struct passwd *pwd = getpwnam(cuser);
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272 | if (pwd == NULL) {
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273 | return mrb_nil_value();
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274 | }
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275 | home = pwd->pw_dir;
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276 | if (!mrb_file_is_absolute_path(home)) {
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277 | mrb_raisef(mrb, E_ARGUMENT_ERROR, "non-absolute home of ~%S", username);
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278 | }
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279 | }
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280 | return mrb_str_new_cstr(mrb, home);
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281 | #else
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282 |
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283 | return mrb_nil_value();
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284 | #endif
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285 | }
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286 |
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287 | mrb_value
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288 | mrb_file_flock(mrb_state *mrb, mrb_value self)
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289 | {
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290 | #if defined(_WIN32) || defined(_WIN64) || defined(sun) || defined(__NEWLIB__)
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291 | mrb_raise(mrb, E_NOTIMP_ERROR, "flock is not supported on Illumos/Solaris/Windows");
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292 | #else
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293 | mrb_int operation;
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294 | int fd;
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295 |
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296 | mrb_get_args(mrb, "i", &operation);
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297 | fd = mrb_fixnum(mrb_io_fileno(mrb, self));
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298 |
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299 | while (flock(fd, operation) == -1) {
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300 | switch (errno) {
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301 | case EINTR:
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302 | /* retry */
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303 | break;
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304 | case EAGAIN: /* NetBSD */
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305 | #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
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306 | case EWOULDBLOCK: /* FreeBSD OpenBSD Linux */
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307 | #endif
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308 | if (operation & LOCK_NB) {
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309 | return mrb_false_value();
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310 | }
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311 | /* FALLTHRU - should not happen */
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312 | default:
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313 | mrb_sys_fail(mrb, "flock failed");
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314 | break;
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315 | }
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316 | }
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317 | #endif
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318 | return mrb_fixnum_value(0);
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319 | }
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320 |
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321 | static mrb_value
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322 | mrb_file_s_symlink(mrb_state *mrb, mrb_value klass)
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323 | {
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324 | #if defined(_WIN32) || defined(_WIN64) || defined(__NEWLIB__)
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325 | mrb_raise(mrb, E_NOTIMP_ERROR, "symlink is not supported on this platform");
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326 | #else
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327 | mrb_value from, to;
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328 | const char *src, *dst;
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329 | int ai = mrb_gc_arena_save(mrb);
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330 |
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331 | mrb_get_args(mrb, "SS", &from, &to);
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332 | src = mrb_str_to_cstr(mrb, from);
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333 | dst = mrb_str_to_cstr(mrb, to);
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334 |
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335 | if (symlink(src, dst) == -1) {
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336 | mrb_sys_fail(mrb, mrb_str_to_cstr(mrb, mrb_format(mrb, "(%S, %S)", from, to)));
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337 | }
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338 | mrb_gc_arena_restore(mrb, ai);
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339 | #endif
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340 | return mrb_fixnum_value(0);
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341 | }
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342 |
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343 | static mrb_value
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344 | mrb_file_s_chmod(mrb_state *mrb, mrb_value klass) {
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345 | mrb_int mode;
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346 | mrb_int argc, i;
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347 | mrb_value *filenames;
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348 | int ai = mrb_gc_arena_save(mrb);
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349 |
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350 | mrb_get_args(mrb, "i*", &mode, &filenames, &argc);
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351 | for (i = 0; i < argc; i++) {
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352 | char *path = mrb_str_to_cstr(mrb, filenames[i]);
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353 | if (CHMOD(path, mode) == -1) {
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354 | mrb_sys_fail(mrb, path);
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355 | }
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356 | }
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357 |
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358 | mrb_gc_arena_restore(mrb, ai);
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359 | return mrb_fixnum_value(argc);
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360 | }
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361 |
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362 | static mrb_value
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363 | mrb_file_s_readlink(mrb_state *mrb, mrb_value klass) {
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364 | #if defined(_WIN32) || defined(_WIN64) || defined(__NEWLIB__)
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365 | mrb_raise(mrb, E_NOTIMP_ERROR, "readlink is not supported on this platform");
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366 | return mrb_nil_value(); // unreachable
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367 | #else
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368 | char *path, *buf;
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369 | size_t bufsize = 100;
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370 | ssize_t rc;
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371 | mrb_value ret;
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372 | int ai = mrb_gc_arena_save(mrb);
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373 |
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374 | mrb_get_args(mrb, "z", &path);
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375 |
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376 | buf = (char *)mrb_malloc(mrb, bufsize);
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377 | while ((rc = readlink(path, buf, bufsize)) == bufsize && rc != -1) {
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378 | bufsize *= 2;
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379 | buf = (char *)mrb_realloc(mrb, buf, bufsize);
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380 | }
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381 | if (rc == -1) {
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382 | mrb_free(mrb, buf);
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383 | mrb_sys_fail(mrb, path);
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384 | }
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385 | ret = mrb_str_new(mrb, buf, rc);
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386 | mrb_free(mrb, buf);
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387 |
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388 | mrb_gc_arena_restore(mrb, ai);
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389 | return ret;
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390 | #endif
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391 | }
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392 |
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393 | void
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394 | mrb_init_file(mrb_state *mrb)
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395 | {
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396 | struct RClass *io, *file, *cnst;
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397 |
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398 | io = mrb_class_get(mrb, "IO");
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399 | file = mrb_define_class(mrb, "File", io);
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400 | MRB_SET_INSTANCE_TT(file, MRB_TT_DATA);
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401 | mrb_define_class_method(mrb, file, "umask", mrb_file_s_umask, MRB_ARGS_REQ(1));
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402 | mrb_define_class_method(mrb, file, "delete", mrb_file_s_unlink, MRB_ARGS_ANY());
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403 | mrb_define_class_method(mrb, file, "unlink", mrb_file_s_unlink, MRB_ARGS_ANY());
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404 | mrb_define_class_method(mrb, file, "rename", mrb_file_s_rename, MRB_ARGS_REQ(2));
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405 | mrb_define_class_method(mrb, file, "symlink", mrb_file_s_symlink, MRB_ARGS_REQ(2));
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406 | mrb_define_class_method(mrb, file, "chmod", mrb_file_s_chmod, MRB_ARGS_REQ(1) | MRB_ARGS_REST());
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407 | mrb_define_class_method(mrb, file, "readlink", mrb_file_s_readlink, MRB_ARGS_REQ(1));
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408 |
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409 | mrb_define_class_method(mrb, file, "dirname", mrb_file_dirname, MRB_ARGS_REQ(1));
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410 | mrb_define_class_method(mrb, file, "basename", mrb_file_basename, MRB_ARGS_REQ(1));
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411 | mrb_define_class_method(mrb, file, "realpath", mrb_file_realpath, MRB_ARGS_REQ(1)|MRB_ARGS_OPT(1));
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412 | mrb_define_class_method(mrb, file, "_getwd", mrb_file__getwd, MRB_ARGS_NONE());
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413 | mrb_define_class_method(mrb, file, "_gethome", mrb_file__gethome, MRB_ARGS_OPT(1));
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414 |
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415 | mrb_define_method(mrb, file, "flock", mrb_file_flock, MRB_ARGS_REQ(1));
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416 |
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417 | cnst = mrb_define_module_under(mrb, file, "Constants");
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418 | mrb_define_const(mrb, cnst, "LOCK_SH", mrb_fixnum_value(LOCK_SH));
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419 | mrb_define_const(mrb, cnst, "LOCK_EX", mrb_fixnum_value(LOCK_EX));
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420 | mrb_define_const(mrb, cnst, "LOCK_UN", mrb_fixnum_value(LOCK_UN));
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421 | mrb_define_const(mrb, cnst, "LOCK_NB", mrb_fixnum_value(LOCK_NB));
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422 | mrb_define_const(mrb, cnst, "SEPARATOR", mrb_str_new_cstr(mrb, FILE_SEPARATOR));
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423 | mrb_define_const(mrb, cnst, "PATH_SEPARATOR", mrb_str_new_cstr(mrb, PATH_SEPARATOR));
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424 | #if defined(_WIN32) || defined(_WIN64)
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425 | mrb_define_const(mrb, cnst, "ALT_SEPARATOR", mrb_str_new_cstr(mrb, FILE_ALT_SEPARATOR));
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426 | #else
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427 | mrb_define_const(mrb, cnst, "ALT_SEPARATOR", mrb_nil_value());
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428 | #endif
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429 | mrb_define_const(mrb, cnst, "NULL", mrb_str_new_cstr(mrb, NULL_FILE));
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430 |
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431 | }
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