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Add File.readlink

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This commit is contained in:
Kohei Suzuki
2016-12-17 15:00:04 +09:00
parent 7e89736291
commit d1c48192cb
3 changed files with 48 additions and 1 deletions
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src/file.c
+31
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@@ -353,6 +353,36 @@ mrb_file_s_chmod(mrb_state *mrb, mrb_value klass) {
return mrb_fixnum_value(argc);
}
static mrb_value
mrb_file_s_readlink(mrb_state *mrb, mrb_value klass) {
#if defined(_WIN32) || defined(_WIN64)
mrb_raise(mrb, E_NOTIMP_ERROR, "readlink is not supported on this platform");
return mrb_nil_value(); // unreachable
#else
char *path, *buf;
size_t bufsize = 100;
ssize_t rc;
mrb_value ret;
int ai = mrb_gc_arena_save(mrb);
mrb_get_args(mrb, "z", &path);
buf = mrb_malloc(mrb, bufsize);
while ((rc = readlink(path, buf, bufsize)) == bufsize && rc != -1) {
bufsize *= 2;
buf = mrb_realloc(mrb, buf, bufsize);
}
if (rc == -1) {
mrb_sys_fail(mrb, path);
}
ret = mrb_str_new(mrb, buf, rc);
mrb_free(mrb, buf);
mrb_gc_arena_restore(mrb, ai);
return ret;
#endif
}
void
mrb_init_file(mrb_state *mrb)
{
@@ -367,6 +397,7 @@ mrb_init_file(mrb_state *mrb)
mrb_define_class_method(mrb, file, "rename", mrb_file_s_rename, MRB_ARGS_REQ(2));
mrb_define_class_method(mrb, file, "symlink", mrb_file_s_symlink, MRB_ARGS_REQ(2));
mrb_define_class_method(mrb, file, "chmod", mrb_file_s_chmod, MRB_ARGS_REQ(1) | MRB_ARGS_REST());
mrb_define_class_method(mrb, file, "readlink", mrb_file_s_readlink, MRB_ARGS_REQ(1));
mrb_define_class_method(mrb, file, "dirname", mrb_file_dirname, MRB_ARGS_REQ(1));
mrb_define_class_method(mrb, file, "basename", mrb_file_basename, MRB_ARGS_REQ(1));