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checking errno after readdir() is just a mistake

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This commit is contained in:
David Rose 2004-06-07 19:07:31 +00:00
parent 9778ec7a19
commit ab68148bdd
1 changed files with 50 additions and 41 deletions
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91
dtool/src/dtoolutil/filename.cxx
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@ -1160,8 +1160,8 @@ find_on_searchpath(const DSearchPath &searchpath) {
bool Filename::
scan_directory(vector_string &contents) const {
#if defined(WIN32_VC)
// Use FindFirstFile()/FindNextFile() to walk through the list of
// files in a directory.
// Use Windows' FindFirstFile() / FindNextFile() to walk through the
// list of files in a directory.
size_t orig_size = contents.size();
string match;
@ -1194,17 +1194,61 @@ scan_directory(vector_string &contents) const {
sort(contents.begin() + orig_size, contents.end());
return scan_ok;
#elif defined(HAVE_DIRENT_H)
// Use Posix's opendir() / readir() to walk through the list of
// files in a directory.
size_t orig_size = contents.size();
string dirname;
if (empty()) {
dirname = ".";
} else {
dirname = _filename;
}
DIR *root = opendir(dirname.c_str());
if (root == (DIR *)NULL) {
perror(dirname.c_str());
return false;
}
struct dirent *d;
d = readdir(root);
while (d != (struct dirent *)NULL) {
if (d->d_name[0] != '.') {
contents.push_back(d->d_name);
}
d = readdir(root);
}
// It turns out to be a mistake to check the value of errno after
// calling readdir(), since it might have been set to non-zero
// during some internal operation of readdir(), even though there
// wasn't really a problem with scanning the directory itself.
/*
if (errno != 0 && errno != ENOENT && errno != ENOTDIR) {
cerr << "Error occurred while scanning directory " << dirname << "\n";
perror(dirname.c_str());
closedir(root);
return false;
}
*/
closedir(root);
sort(contents.begin() + orig_size, contents.end());
return true;
#elif defined(HAVE_GLOB_H)
// In some cases, particularly with NFS, it seems that opendir()
// .. readdir() fails to properly read the entire directory ("Value
// too large for defined data type"), but glob() succeeds.
// It's hard to imagine a system that provides glob.h but does not
// provide openddir() .. readdir(), but this code is leftover from a
// time when there was an undetected bug in the above readdir()
// loop, and it works, so we might as well keep it around for now.
string dirname;
if (empty()) {
dirname = "*";
} else if (_filename[_filename.length() - 1] == '/') {
dirname = _filename + "*";
} else {
dirname = _filename + "/*";
dirname = _filename + "/*"; /* comment to fix emacs syntax hilight */
}
glob_t globbuf;
@ -1235,41 +1279,6 @@ scan_directory(vector_string &contents) const {
globfree(&globbuf);
return true;
#elif defined(HAVE_DIRENT_H)
size_t orig_size = contents.size();
string dirname;
if (empty()) {
dirname = ".";
} else {
dirname = _filename;
}
DIR *root = opendir(dirname.c_str());
if (root == (DIR *)NULL) {
perror(dirname.c_str());
return false;
}
errno = 0;
struct dirent *d;
d = readdir(root);
while (d != (struct dirent *)NULL) {
if (d->d_name[0] != '.') {
contents.push_back(d->d_name);
}
d = readdir(root);
}
if (errno != 0 && errno != ENOENT && errno != ENOTDIR) {
cerr << "Error occurred while scanning directory " << dirname << "\n";
perror(dirname.c_str());
closedir(root);
return false;
}
closedir(root);
sort(contents.begin() + orig_size, contents.end());
return true;
#else
// Don't know how to scan directories!