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// Copyright 2014 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/main/cpp/util/file.h"
#include <errno.h> // EINVAL
#include <limits.h> // PATH_MAX
#include <sys/stat.h>
#include <unistd.h> // access
#include <cstdlib>
#include <vector>
#include "src/main/cpp/util/exit_code.h"
#include "src/main/cpp/util/errors.h"
#include "src/main/cpp/util/strings.h"
using std::pair;
namespace blaze_util {
pair<string, string> SplitPath(const string &path) {
size_t pos = path.rfind('/');
// Handle the case with no '/' in 'path'.
if (pos == string::npos) return std::make_pair("", path);
// Handle the case with a single leading '/' in 'path'.
if (pos == 0) return std::make_pair(string(path, 0, 1), string(path, 1));
return std::make_pair(string(path, 0, pos), string(path, pos + 1));
}
string Dirname(const string &path) {
return SplitPath(path).first;
}
string Basename(const string &path) {
return SplitPath(path).second;
}
string JoinPath(const string &path1, const string &path2) {
if (path1.empty()) {
// "" + "/bar"
return path2;
}
if (path1[path1.size() - 1] == '/') {
if (path2.find('/') == 0) {
// foo/ + /bar
return path1 + path2.substr(1);
} else {
// foo/ + bar
return path1 + path2;
}
} else {
if (path2.find('/') == 0) {
// foo + /bar
return path1 + path2;
} else {
// foo + bar
return path1 + "/" + path2;
}
}
}
string Which(const string &executable) {
char *path_cstr = getenv("PATH");
if (path_cstr == NULL || path_cstr[0] == '\0') {
die(blaze_exit_code::LOCAL_ENVIRONMENTAL_ERROR,
"Could not get PATH to find %s", executable.c_str());
}
string path(path_cstr);
std::vector<std::string> pieces = blaze_util::Split(path, ':');
for (auto piece : pieces) {
if (piece.empty()) {
piece = ".";
}
struct stat file_stat;
string candidate = blaze_util::JoinPath(piece, executable);
if (access(candidate.c_str(), X_OK) == 0 &&
stat(candidate.c_str(), &file_stat) == 0 &&
S_ISREG(file_stat.st_mode)) {
return candidate;
}
}
return "";
}
} // namespace blaze_util
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