lean2/src/util/lean_path.cpp

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/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include <string>
#include <cstdlib>
#include <fstream>
#include <vector>
#include "util/exception.h"
#include "util/sstream.h"
namespace lean {
#if defined(LEAN_WINDOWS)
// Windows version
#include <windows.h>
static char g_path_sep = ';';
static char g_sep = '\\';
static char g_bad_sep = '/';
static std::string get_exe_location() {
HMODULE hModule = GetModuleHandleW(NULL);
WCHAR path[MAX_PATH];
GetModuleFileNameW(hModule, path, MAX_PATH);
std::wstring pathstr(path);
return std::string(pathstr.begin(), pathstr.end());
}
#elif defined(__APPLE__)
// OSX version
#include <mach-o/dyld.h>
#include <limits.h>
static char g_path_sep = ':';
static char g_sep = '/';
static char g_bad_sep = '\\';
static std::string get_exe_location() {
char buf[PATH_MAX];
uint32_t bufsize = PATH_MAX;
if (_NSGetExecutablePath(buf, &bufsize) != 0)
throw exception("failed to locate Lean executable location");
return std::string(buf);
}
#else
// Linux version
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <limits.h> // NOLINT
#include <stdio.h>
static char g_path_sep = ':';
static char g_sep = '/';
static char g_bad_sep = '\\';
static std::string get_exe_location() {
char path[PATH_MAX];
char dest[PATH_MAX];
memset(dest, 0, PATH_MAX);
pid_t pid = getpid();
snprintf(path, PATH_MAX, "/proc/%d/exe", pid);
if (readlink(path, dest, PATH_MAX) == -1) {
throw exception("failed to locate Lean executable location");
} else {
return std::string(dest);
}
}
#endif
std::string normalize_path(std::string f) {
for (auto & c : f) {
if (c == g_bad_sep)
c = g_sep;
}
return f;
}
std::string get_path(std::string f) {
while (true) {
if (f.empty())
throw exception("failed to locate Lean executable location");
if (f.back() == g_sep) {
f.pop_back();
return f;
}
f.pop_back();
}
}
static std::string g_lean_path;
static std::vector<std::string> g_lean_path_vector;
struct init_lean_path {
init_lean_path() {
char * r = getenv("LEAN_PATH");
if (r == nullptr) {
g_lean_path = ".";
std::string exe_path = get_path(get_exe_location());
g_lean_path += g_path_sep;
g_lean_path += exe_path + g_sep + ".." + g_sep + "library";
g_lean_path += g_path_sep;
g_lean_path += exe_path;
} else {
g_lean_path = r;
}
g_lean_path = normalize_path(g_lean_path);
unsigned i = 0;
unsigned j = 0;
unsigned sz = g_lean_path.size();
for (; j < sz; j++) {
if (g_lean_path[j] == g_path_sep) {
if (j > i)
g_lean_path_vector.push_back(g_lean_path.substr(i, j - i));
i = j + 1;
}
}
if (j > i)
g_lean_path_vector.push_back(g_lean_path.substr(i, j - i));
}
};
static init_lean_path g_init_lean_path;
std::string find_file(char const * fname) {
std::string nfname = normalize_path(std::string(fname));
for (auto path : g_lean_path_vector) {
std::string file = path + g_sep + nfname;
std::ifstream ifile(file);
if (ifile)
return file;
}
throw exception(sstream() << "file '" << fname << "' not found in the LEAN_PATH");
}
char const * get_lean_path() {
return g_lean_path.c_str();
}
}