summaryrefslogtreecommitdiffstats
path: root/PC/launcher.c
diff options
context:
space:
mode:
Diffstat (limited to 'PC/launcher.c')
-rw-r--r--PC/launcher.c1365
1 files changed, 1365 insertions, 0 deletions
diff --git a/PC/launcher.c b/PC/launcher.c
new file mode 100644
index 0000000..dfad44a
--- /dev/null
+++ b/PC/launcher.c
@@ -0,0 +1,1365 @@
+/*
+ * Copyright (C) 2011-2012 Vinay Sajip.
+ * Licensed to PSF under a contributor agreement.
+ *
+ * Based on the work of:
+ *
+ * Mark Hammond (original author of Python version)
+ * Curt Hagenlocher (job management)
+ */
+
+#include <windows.h>
+#include <shlobj.h>
+#include <stdio.h>
+#include <tchar.h>
+
+#define BUFSIZE 256
+#define MSGSIZE 1024
+
+/* Build options. */
+#define SKIP_PREFIX
+/* #define SEARCH_PATH */
+
+/* Just for now - static definition */
+
+static FILE * log_fp = NULL;
+
+static wchar_t *
+skip_whitespace(wchar_t * p)
+{
+ while (*p && isspace(*p))
+ ++p;
+ return p;
+}
+
+/*
+ * This function is here to simplify memory management
+ * and to treat blank values as if they are absent.
+ */
+static wchar_t * get_env(wchar_t * key)
+{
+ /* This is not thread-safe, just like getenv */
+ static wchar_t buf[256];
+ DWORD result = GetEnvironmentVariableW(key, buf, 256);
+
+ if (result > 255) {
+ /* Large environment variable. Accept some leakage */
+ wchar_t *buf2 = (wchar_t*)malloc(sizeof(wchar_t) * (result+1));
+ GetEnvironmentVariableW(key, buf2, result);
+ return buf2;
+ }
+
+ if (result == 0)
+ /* Either some error, e.g. ERROR_ENVVAR_NOT_FOUND,
+ or an empty environment variable. */
+ return NULL;
+
+ return buf;
+}
+
+
+static void
+debug(wchar_t * format, ...)
+{
+ va_list va;
+
+ if (log_fp != NULL) {
+ va_start(va, format);
+ vfwprintf_s(log_fp, format, va);
+ }
+}
+
+static void
+winerror(int rc, wchar_t * message, int size)
+{
+ FormatMessageW(
+ FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+ NULL, rc, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+ message, size, NULL);
+}
+
+static void
+error(int rc, wchar_t * format, ... )
+{
+ va_list va;
+ wchar_t message[MSGSIZE];
+ wchar_t win_message[MSGSIZE];
+ int len;
+
+ va_start(va, format);
+ len = _vsnwprintf_s(message, MSGSIZE, _TRUNCATE, format, va);
+
+ if (rc == 0) { /* a Windows error */
+ winerror(GetLastError(), win_message, MSGSIZE);
+ if (len >= 0) {
+ _snwprintf_s(&message[len], MSGSIZE - len, _TRUNCATE, L": %s",
+ win_message);
+ }
+ }
+
+#if !defined(_WINDOWS)
+ fwprintf(stderr, L"%s\n", message);
+#else
+ MessageBox(NULL, message, TEXT("Python Launcher is sorry to say ..."), MB_OK);
+#endif
+ ExitProcess(rc);
+}
+
+#if defined(_WINDOWS)
+
+#define PYTHON_EXECUTABLE L"pythonw.exe"
+
+#else
+
+#define PYTHON_EXECUTABLE L"python.exe"
+
+#endif
+
+#define RC_NO_STD_HANDLES 100
+#define RC_CREATE_PROCESS 101
+#define RC_BAD_VIRTUAL_PATH 102
+#define RC_NO_PYTHON 103
+
+#define MAX_VERSION_SIZE 4
+
+typedef struct {
+ wchar_t version[MAX_VERSION_SIZE]; /* m.n */
+ int bits; /* 32 or 64 */
+ wchar_t executable[MAX_PATH];
+} INSTALLED_PYTHON;
+
+/*
+ * To avoid messing about with heap allocations, just assume we can allocate
+ * statically and never have to deal with more versions than this.
+ */
+#define MAX_INSTALLED_PYTHONS 100
+
+static INSTALLED_PYTHON installed_pythons[MAX_INSTALLED_PYTHONS];
+
+static size_t num_installed_pythons = 0;
+
+/* to hold SOFTWARE\Python\PythonCore\X.Y\InstallPath */
+#define IP_BASE_SIZE 40
+#define IP_SIZE (IP_BASE_SIZE + MAX_VERSION_SIZE)
+#define CORE_PATH L"SOFTWARE\\Python\\PythonCore"
+
+static wchar_t * location_checks[] = {
+ L"\\",
+ L"\\PCBuild\\",
+ L"\\PCBuild\\amd64\\",
+ NULL
+};
+
+static INSTALLED_PYTHON *
+find_existing_python(wchar_t * path)
+{
+ INSTALLED_PYTHON * result = NULL;
+ size_t i;
+ INSTALLED_PYTHON * ip;
+
+ for (i = 0, ip = installed_pythons; i < num_installed_pythons; i++, ip++) {
+ if (_wcsicmp(path, ip->executable) == 0) {
+ result = ip;
+ break;
+ }
+ }
+ return result;
+}
+
+static void
+locate_pythons_for_key(HKEY root, REGSAM flags)
+{
+ HKEY core_root, ip_key;
+ LSTATUS status = RegOpenKeyExW(root, CORE_PATH, 0, flags, &core_root);
+ wchar_t message[MSGSIZE];
+ DWORD i;
+ size_t n;
+ BOOL ok;
+ DWORD type, data_size, attrs;
+ INSTALLED_PYTHON * ip, * pip;
+ wchar_t ip_path[IP_SIZE];
+ wchar_t * check;
+ wchar_t ** checkp;
+ wchar_t *key_name = (root == HKEY_LOCAL_MACHINE) ? L"HKLM" : L"HKCU";
+
+ if (status != ERROR_SUCCESS)
+ debug(L"locate_pythons_for_key: unable to open PythonCore key in %s\n",
+ key_name);
+ else {
+ ip = &installed_pythons[num_installed_pythons];
+ for (i = 0; num_installed_pythons < MAX_INSTALLED_PYTHONS; i++) {
+ status = RegEnumKeyW(core_root, i, ip->version, MAX_VERSION_SIZE);
+ if (status != ERROR_SUCCESS) {
+ if (status != ERROR_NO_MORE_ITEMS) {
+ /* unexpected error */
+ winerror(status, message, MSGSIZE);
+ debug(L"Can't enumerate registry key for version %s: %s\n",
+ ip->version, message);
+ }
+ break;
+ }
+ else {
+ _snwprintf_s(ip_path, IP_SIZE, _TRUNCATE,
+ L"%s\\%s\\InstallPath", CORE_PATH, ip->version);
+ status = RegOpenKeyExW(root, ip_path, 0, flags, &ip_key);
+ if (status != ERROR_SUCCESS) {
+ winerror(status, message, MSGSIZE);
+ // Note: 'message' already has a trailing \n
+ debug(L"%s\\%s: %s", key_name, ip_path, message);
+ continue;
+ }
+ data_size = sizeof(ip->executable) - 1;
+ status = RegQueryValueExW(ip_key, NULL, NULL, &type,
+ (LPBYTE)ip->executable, &data_size);
+ RegCloseKey(ip_key);
+ if (status != ERROR_SUCCESS) {
+ winerror(status, message, MSGSIZE);
+ debug(L"%s\\%s: %s\n", key_name, ip_path, message);
+ continue;
+ }
+ if (type == REG_SZ) {
+ data_size = data_size / sizeof(wchar_t) - 1; /* for NUL */
+ if (ip->executable[data_size - 1] == L'\\')
+ --data_size; /* reg value ended in a backslash */
+ /* ip->executable is data_size long */
+ for (checkp = location_checks; *checkp; ++checkp) {
+ check = *checkp;
+ _snwprintf_s(&ip->executable[data_size],
+ MAX_PATH - data_size,
+ MAX_PATH - data_size,
+ L"%s%s", check, PYTHON_EXECUTABLE);
+ attrs = GetFileAttributesW(ip->executable);
+ if (attrs == INVALID_FILE_ATTRIBUTES) {
+ winerror(GetLastError(), message, MSGSIZE);
+ debug(L"locate_pythons_for_key: %s: %s",
+ ip->executable, message);
+ }
+ else if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
+ debug(L"locate_pythons_for_key: '%s' is a \
+directory\n",
+ ip->executable, attrs);
+ }
+ else if (find_existing_python(ip->executable)) {
+ debug(L"locate_pythons_for_key: %s: already \
+found: %s\n", ip->executable);
+ }
+ else {
+ /* check the executable type. */
+ ok = GetBinaryTypeW(ip->executable, &attrs);
+ if (!ok) {
+ debug(L"Failure getting binary type: %s\n",
+ ip->executable);
+ }
+ else {
+ if (attrs == SCS_64BIT_BINARY)
+ ip->bits = 64;
+ else if (attrs == SCS_32BIT_BINARY)
+ ip->bits = 32;
+ else
+ ip->bits = 0;
+ if (ip->bits == 0) {
+ debug(L"locate_pythons_for_key: %s: \
+invalid binary type: %X\n",
+ ip->executable, attrs);
+ }
+ else {
+ if (wcschr(ip->executable, L' ') != NULL) {
+ /* has spaces, so quote */
+ n = wcslen(ip->executable);
+ memmove(&ip->executable[1],
+ ip->executable, n * sizeof(wchar_t));
+ ip->executable[0] = L'\"';
+ ip->executable[n + 1] = L'\"';
+ ip->executable[n + 2] = L'\0';
+ }
+ debug(L"locate_pythons_for_key: %s \
+is a %dbit executable\n",
+ ip->executable, ip->bits);
+ ++num_installed_pythons;
+ pip = ip++;
+ if (num_installed_pythons >=
+ MAX_INSTALLED_PYTHONS)
+ break;
+ /* Copy over the attributes for the next */
+ *ip = *pip;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ RegCloseKey(core_root);
+ }
+}
+
+static int
+compare_pythons(const void * p1, const void * p2)
+{
+ INSTALLED_PYTHON * ip1 = (INSTALLED_PYTHON *) p1;
+ INSTALLED_PYTHON * ip2 = (INSTALLED_PYTHON *) p2;
+ /* note reverse sorting on version */
+ int result = wcscmp(ip2->version, ip1->version);
+
+ if (result == 0)
+ result = ip2->bits - ip1->bits; /* 64 before 32 */
+ return result;
+}
+
+static void
+locate_all_pythons()
+{
+#if defined(_M_X64)
+ // If we are a 64bit process, first hit the 32bit keys.
+ debug(L"locating Pythons in 32bit registry\n");
+ locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ | KEY_WOW64_32KEY);
+ locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ | KEY_WOW64_32KEY);
+#else
+ // If we are a 32bit process on a 64bit Windows, first hit the 64bit keys.
+ BOOL f64 = FALSE;
+ if (IsWow64Process(GetCurrentProcess(), &f64) && f64) {
+ debug(L"locating Pythons in 64bit registry\n");
+ locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ | KEY_WOW64_64KEY);
+ locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ | KEY_WOW64_64KEY);
+ }
+#endif
+ // now hit the "native" key for this process bittedness.
+ debug(L"locating Pythons in native registry\n");
+ locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ);
+ locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ);
+ qsort(installed_pythons, num_installed_pythons, sizeof(INSTALLED_PYTHON),
+ compare_pythons);
+}
+
+static INSTALLED_PYTHON *
+find_python_by_version(wchar_t const * wanted_ver)
+{
+ INSTALLED_PYTHON * result = NULL;
+ INSTALLED_PYTHON * ip = installed_pythons;
+ size_t i, n;
+ size_t wlen = wcslen(wanted_ver);
+ int bits = 0;
+
+ if (wcsstr(wanted_ver, L"-32"))
+ bits = 32;
+ for (i = 0; i < num_installed_pythons; i++, ip++) {
+ n = wcslen(ip->version);
+ if (n > wlen)
+ n = wlen;
+ if ((wcsncmp(ip->version, wanted_ver, n) == 0) &&
+ /* bits == 0 => don't care */
+ ((bits == 0) || (ip->bits == bits))) {
+ result = ip;
+ break;
+ }
+ }
+ return result;
+}
+
+
+static wchar_t appdata_ini_path[MAX_PATH];
+static wchar_t launcher_ini_path[MAX_PATH];
+
+/*
+ * Get a value either from the environment or a configuration file.
+ * The key passed in will either be "python", "python2" or "python3".
+ */
+static wchar_t *
+get_configured_value(wchar_t * key)
+{
+/*
+ * Note: this static value is used to return a configured value
+ * obtained either from the environment or configuration file.
+ * This should be OK since there wouldn't be any concurrent calls.
+ */
+ static wchar_t configured_value[MSGSIZE];
+ wchar_t * result = NULL;
+ wchar_t * found_in = L"environment";
+ DWORD size;
+
+ /* First, search the environment. */
+ _snwprintf_s(configured_value, MSGSIZE, _TRUNCATE, L"py_%s", key);
+ result = get_env(configured_value);
+ if (result == NULL && appdata_ini_path[0]) {
+ /* Not in environment: check local configuration. */
+ size = GetPrivateProfileStringW(L"defaults", key, NULL,
+ configured_value, MSGSIZE,
+ appdata_ini_path);
+ if (size > 0) {
+ result = configured_value;
+ found_in = appdata_ini_path;
+ }
+ }
+ if (result == NULL && launcher_ini_path[0]) {
+ /* Not in environment or local: check global configuration. */
+ size = GetPrivateProfileStringW(L"defaults", key, NULL,
+ configured_value, MSGSIZE,
+ launcher_ini_path);
+ if (size > 0) {
+ result = configured_value;
+ found_in = launcher_ini_path;
+ }
+ }
+ if (result) {
+ debug(L"found configured value '%s=%s' in %s\n",
+ key, result, found_in ? found_in : L"(unknown)");
+ } else {
+ debug(L"found no configured value for '%s'\n", key);
+ }
+ return result;
+}
+
+static INSTALLED_PYTHON *
+locate_python(wchar_t * wanted_ver)
+{
+ static wchar_t config_key [] = { L"pythonX" };
+ static wchar_t * last_char = &config_key[sizeof(config_key) /
+ sizeof(wchar_t) - 2];
+ INSTALLED_PYTHON * result = NULL;
+ size_t n = wcslen(wanted_ver);
+ wchar_t * configured_value;
+
+ if (num_installed_pythons == 0)
+ locate_all_pythons();
+
+ if (n == 1) { /* just major version specified */
+ *last_char = *wanted_ver;
+ configured_value = get_configured_value(config_key);
+ if (configured_value != NULL)
+ wanted_ver = configured_value;
+ }
+ if (*wanted_ver) {
+ result = find_python_by_version(wanted_ver);
+ debug(L"search for Python version '%s' found ", wanted_ver);
+ if (result) {
+ debug(L"'%s'\n", result->executable);
+ } else {
+ debug(L"no interpreter\n");
+ }
+ }
+ else {
+ *last_char = L'\0'; /* look for an overall default */
+ configured_value = get_configured_value(config_key);
+ if (configured_value)
+ result = find_python_by_version(configured_value);
+ if (result == NULL)
+ result = find_python_by_version(L"2");
+ if (result == NULL)
+ result = find_python_by_version(L"3");
+ debug(L"search for default Python found ");
+ if (result) {
+ debug(L"version %s at '%s'\n",
+ result->version, result->executable);
+ } else {
+ debug(L"no interpreter\n");
+ }
+ }
+ return result;
+}
+
+/*
+ * Process creation code
+ */
+
+static BOOL
+safe_duplicate_handle(HANDLE in, HANDLE * pout)
+{
+ BOOL ok;
+ HANDLE process = GetCurrentProcess();
+ DWORD rc;
+
+ *pout = NULL;
+ ok = DuplicateHandle(process, in, process, pout, 0, TRUE,
+ DUPLICATE_SAME_ACCESS);
+ if (!ok) {
+ rc = GetLastError();
+ if (rc == ERROR_INVALID_HANDLE) {
+ debug(L"DuplicateHandle returned ERROR_INVALID_HANDLE\n");
+ ok = TRUE;
+ }
+ else {
+ debug(L"DuplicateHandle returned %d\n", rc);
+ }
+ }
+ return ok;
+}
+
+static BOOL WINAPI
+ctrl_c_handler(DWORD code)
+{
+ return TRUE; /* We just ignore all control events. */
+}
+
+static void
+run_child(wchar_t * cmdline)
+{
+ HANDLE job;
+ JOBOBJECT_EXTENDED_LIMIT_INFORMATION info;
+ DWORD rc;
+ BOOL ok;
+ STARTUPINFOW si;
+ PROCESS_INFORMATION pi;
+
+ debug(L"run_child: about to run '%s'\n", cmdline);
+ job = CreateJobObject(NULL, NULL);
+ ok = QueryInformationJobObject(job, JobObjectExtendedLimitInformation,
+ &info, sizeof(info), &rc);
+ if (!ok || (rc != sizeof(info)) || !job)
+ error(RC_CREATE_PROCESS, L"Job information querying failed");
+ info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE |
+ JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK;
+ ok = SetInformationJobObject(job, JobObjectExtendedLimitInformation, &info,
+ sizeof(info));
+ if (!ok)
+ error(RC_CREATE_PROCESS, L"Job information setting failed");
+ memset(&si, 0, sizeof(si));
+ si.cb = sizeof(si);
+ ok = safe_duplicate_handle(GetStdHandle(STD_INPUT_HANDLE), &si.hStdInput);
+ if (!ok)
+ error(RC_NO_STD_HANDLES, L"stdin duplication failed");
+ ok = safe_duplicate_handle(GetStdHandle(STD_OUTPUT_HANDLE), &si.hStdOutput);
+ if (!ok)
+ error(RC_NO_STD_HANDLES, L"stdout duplication failed");
+ ok = safe_duplicate_handle(GetStdHandle(STD_ERROR_HANDLE), &si.hStdError);
+ if (!ok)
+ error(RC_NO_STD_HANDLES, L"stderr duplication failed");
+
+ ok = SetConsoleCtrlHandler(ctrl_c_handler, TRUE);
+ if (!ok)
+ error(RC_CREATE_PROCESS, L"control handler setting failed");
+
+ si.dwFlags = STARTF_USESTDHANDLES;
+ ok = CreateProcessW(NULL, cmdline, NULL, NULL, TRUE,
+ 0, NULL, NULL, &si, &pi);
+ if (!ok)
+ error(RC_CREATE_PROCESS, L"Unable to create process using '%s'", cmdline);
+ AssignProcessToJobObject(job, pi.hProcess);
+ CloseHandle(pi.hThread);
+ WaitForSingleObject(pi.hProcess, INFINITE);
+ ok = GetExitCodeProcess(pi.hProcess, &rc);
+ if (!ok)
+ error(RC_CREATE_PROCESS, L"Failed to get exit code of process");
+ debug(L"child process exit code: %d\n", rc);
+ ExitProcess(rc);
+}
+
+static void
+invoke_child(wchar_t * executable, wchar_t * suffix, wchar_t * cmdline)
+{
+ wchar_t * child_command;
+ size_t child_command_size;
+ BOOL no_suffix = (suffix == NULL) || (*suffix == L'\0');
+ BOOL no_cmdline = (*cmdline == L'\0');
+
+ if (no_suffix && no_cmdline)
+ run_child(executable);
+ else {
+ if (no_suffix) {
+ /* add 2 for space separator + terminating NUL. */
+ child_command_size = wcslen(executable) + wcslen(cmdline) + 2;
+ }
+ else {
+ /* add 3 for 2 space separators + terminating NUL. */
+ child_command_size = wcslen(executable) + wcslen(suffix) +
+ wcslen(cmdline) + 3;
+ }
+ child_command = calloc(child_command_size, sizeof(wchar_t));
+ if (child_command == NULL)
+ error(RC_CREATE_PROCESS, L"unable to allocate %d bytes for child command.",
+ child_command_size);
+ if (no_suffix)
+ _snwprintf_s(child_command, child_command_size,
+ child_command_size - 1, L"%s %s",
+ executable, cmdline);
+ else
+ _snwprintf_s(child_command, child_command_size,
+ child_command_size - 1, L"%s %s %s",
+ executable, suffix, cmdline);
+ run_child(child_command);
+ free(child_command);
+ }
+}
+
+static wchar_t * builtin_virtual_paths [] = {
+ L"/usr/bin/env python",
+ L"/usr/bin/python",
+ L"/usr/local/bin/python",
+ L"python",
+ NULL
+};
+
+/* For now, a static array of commands. */
+
+#define MAX_COMMANDS 100
+
+typedef struct {
+ wchar_t key[MAX_PATH];
+ wchar_t value[MSGSIZE];
+} COMMAND;
+
+static COMMAND commands[MAX_COMMANDS];
+static int num_commands = 0;
+
+#if defined(SKIP_PREFIX)
+
+static wchar_t * builtin_prefixes [] = {
+ /* These must be in an order that the longest matches should be found,
+ * i.e. if the prefix is "/usr/bin/env ", it should match that entry
+ * *before* matching "/usr/bin/".
+ */
+ L"/usr/bin/env ",
+ L"/usr/bin/",
+ L"/usr/local/bin/",
+ NULL
+};
+
+static wchar_t * skip_prefix(wchar_t * name)
+{
+ wchar_t ** pp = builtin_prefixes;
+ wchar_t * result = name;
+ wchar_t * p;
+ size_t n;
+
+ for (; p = *pp; pp++) {
+ n = wcslen(p);
+ if (_wcsnicmp(p, name, n) == 0) {
+ result += n; /* skip the prefix */
+ if (p[n - 1] == L' ') /* No empty strings in table, so n > 1 */
+ result = skip_whitespace(result);
+ break;
+ }
+ }
+ return result;
+}
+
+#endif
+
+#if defined(SEARCH_PATH)
+
+static COMMAND path_command;
+
+static COMMAND * find_on_path(wchar_t * name)
+{
+ wchar_t * pathext;
+ size_t varsize;
+ wchar_t * context = NULL;
+ wchar_t * extension;
+ COMMAND * result = NULL;
+ DWORD len;
+ errno_t rc;
+
+ wcscpy_s(path_command.key, MAX_PATH, name);
+ if (wcschr(name, L'.') != NULL) {
+ /* assume it has an extension. */
+ len = SearchPathW(NULL, name, NULL, MSGSIZE, path_command.value, NULL);
+ if (len) {
+ result = &path_command;
+ }
+ }
+ else {
+ /* No extension - search using registered extensions. */
+ rc = _wdupenv_s(&pathext, &varsize, L"PATHEXT");
+ if (rc == 0) {
+ extension = wcstok_s(pathext, L";", &context);
+ while (extension) {
+ len = SearchPathW(NULL, name, extension, MSGSIZE, path_command.value, NULL);
+ if (len) {
+ result = &path_command;
+ break;
+ }
+ extension = wcstok_s(NULL, L";", &context);
+ }
+ free(pathext);
+ }
+ }
+ return result;
+}
+
+#endif
+
+static COMMAND * find_command(wchar_t * name)
+{
+ COMMAND * result = NULL;
+ COMMAND * cp = commands;
+ int i;
+
+ for (i = 0; i < num_commands; i++, cp++) {
+ if (_wcsicmp(cp->key, name) == 0) {
+ result = cp;
+ break;
+ }
+ }
+#if defined(SEARCH_PATH)
+ if (result == NULL)
+ result = find_on_path(name);
+#endif
+ return result;
+}
+
+static void
+update_command(COMMAND * cp, wchar_t * name, wchar_t * cmdline)
+{
+ wcsncpy_s(cp->key, MAX_PATH, name, _TRUNCATE);
+ wcsncpy_s(cp->value, MSGSIZE, cmdline, _TRUNCATE);
+}
+
+static void
+add_command(wchar_t * name, wchar_t * cmdline)
+{
+ if (num_commands >= MAX_COMMANDS) {
+ debug(L"can't add %s = '%s': no room\n", name, cmdline);
+ }
+ else {
+ COMMAND * cp = &commands[num_commands++];
+
+ update_command(cp, name, cmdline);
+ }
+}
+
+static void
+read_config_file(wchar_t * config_path)
+{
+ wchar_t keynames[MSGSIZE];
+ wchar_t value[MSGSIZE];
+ DWORD read;
+ wchar_t * key;
+ COMMAND * cp;
+ wchar_t * cmdp;
+
+ read = GetPrivateProfileStringW(L"commands", NULL, NULL, keynames, MSGSIZE,
+ config_path);
+ if (read == MSGSIZE - 1) {
+ debug(L"read_commands: %s: not enough space for names\n", config_path);
+ }
+ key = keynames;
+ while (*key) {
+ read = GetPrivateProfileStringW(L"commands", key, NULL, value, MSGSIZE,
+ config_path);
+ if (read == MSGSIZE - 1) {
+ debug(L"read_commands: %s: not enough space for %s\n",
+ config_path, key);
+ }
+ cmdp = skip_whitespace(value);
+ if (*cmdp) {
+ cp = find_command(key);
+ if (cp == NULL)
+ add_command(key, value);
+ else
+ update_command(cp, key, value);
+ }
+ key += wcslen(key) + 1;
+ }
+}
+
+static void read_commands()
+{
+ if (launcher_ini_path[0])
+ read_config_file(launcher_ini_path);
+ if (appdata_ini_path[0])
+ read_config_file(appdata_ini_path);
+}
+
+static BOOL
+parse_shebang(wchar_t * shebang_line, int nchars, wchar_t ** command,
+ wchar_t ** suffix)
+{
+ BOOL rc = FALSE;
+ wchar_t ** vpp;
+ size_t plen;
+ wchar_t * p;
+ wchar_t zapped;
+ wchar_t * endp = shebang_line + nchars - 1;
+ COMMAND * cp;
+ wchar_t * skipped;
+
+ *command = NULL; /* failure return */
+ *suffix = NULL;
+
+ if ((*shebang_line++ == L'#') && (*shebang_line++ == L'!')) {
+ shebang_line = skip_whitespace(shebang_line);
+ if (*shebang_line) {
+ *command = shebang_line;
+ for (vpp = builtin_virtual_paths; *vpp; ++vpp) {
+ plen = wcslen(*vpp);
+ if (wcsncmp(shebang_line, *vpp, plen) == 0) {
+ rc = TRUE;
+ /* We can do this because all builtin commands contain
+ * "python".
+ */
+ *command = wcsstr(shebang_line, L"python");
+ break;
+ }
+ }
+ if (*vpp == NULL) {
+ /*
+ * Not found in builtins - look in customised commands.
+ *
+ * We can't permanently modify the shebang line in case
+ * it's not a customised command, but we can temporarily
+ * stick a NUL after the command while searching for it,
+ * then put back the char we zapped.
+ */
+#if defined(SKIP_PREFIX)
+ skipped = skip_prefix(shebang_line);
+#else
+ skipped = shebang_line;
+#endif
+ p = wcspbrk(skipped, L" \t\r\n");
+ if (p != NULL) {
+ zapped = *p;
+ *p = L'\0';
+ }
+ cp = find_command(skipped);
+ if (p != NULL)
+ *p = zapped;
+ if (cp != NULL) {
+ *command = cp->value;
+ if (p != NULL)
+ *suffix = skip_whitespace(p);
+ }
+ }
+ /* remove trailing whitespace */
+ while ((endp > shebang_line) && isspace(*endp))
+ --endp;
+ if (endp > shebang_line)
+ endp[1] = L'\0';
+ }
+ }
+ return rc;
+}
+
+/* #define CP_UTF8 65001 defined in winnls.h */
+#define CP_UTF16LE 1200
+#define CP_UTF16BE 1201
+#define CP_UTF32LE 12000
+#define CP_UTF32BE 12001
+
+typedef struct {
+ int length;
+ char sequence[4];
+ UINT code_page;
+} BOM;
+
+/*
+ * Strictly, we don't need to handle UTF-16 anf UTF-32, since Python itself
+ * doesn't. Never mind, one day it might - there's no harm leaving it in.
+ */
+static BOM BOMs[] = {
+ { 3, { 0xEF, 0xBB, 0xBF }, CP_UTF8 }, /* UTF-8 - keep first */
+ { 2, { 0xFF, 0xFE }, CP_UTF16LE }, /* UTF-16LE */
+ { 2, { 0xFE, 0xFF }, CP_UTF16BE }, /* UTF-16BE */
+ { 4, { 0xFF, 0xFE, 0x00, 0x00 }, CP_UTF32LE }, /* UTF-32LE */
+ { 4, { 0x00, 0x00, 0xFE, 0xFF }, CP_UTF32BE }, /* UTF-32BE */
+ { 0 } /* sentinel */
+};
+
+static BOM *
+find_BOM(char * buffer)
+{
+/*
+ * Look for a BOM in the input and return a pointer to the
+ * corresponding structure, or NULL if not found.
+ */
+ BOM * result = NULL;
+ BOM *bom;
+
+ for (bom = BOMs; bom->length; bom++) {
+ if (strncmp(bom->sequence, buffer, bom->length) == 0) {
+ result = bom;
+ break;
+ }
+ }
+ return result;
+}
+
+static char *
+find_terminator(char * buffer, int len, BOM *bom)
+{
+ char * result = NULL;
+ char * end = buffer + len;
+ char * p;
+ char c;
+ int cp;
+
+ for (p = buffer; p < end; p++) {
+ c = *p;
+ if (c == '\r') {
+ result = p;
+ break;
+ }
+ if (c == '\n') {
+ result = p;
+ break;
+ }
+ }
+ if (result != NULL) {
+ cp = bom->code_page;
+
+ /* adjustments to include all bytes of the char */
+ /* no adjustment needed for UTF-8 or big endian */
+ if (cp == CP_UTF16LE)
+ ++result;
+ else if (cp == CP_UTF32LE)
+ result += 3;
+ ++result; /* point just past terminator */
+ }
+ return result;
+}
+
+static BOOL
+validate_version(wchar_t * p)
+{
+ BOOL result = TRUE;
+
+ if (!isdigit(*p)) /* expect major version */
+ result = FALSE;
+ else if (*++p) { /* more to do */
+ if (*p != L'.') /* major/minor separator */
+ result = FALSE;
+ else {
+ ++p;
+ if (!isdigit(*p)) /* expect minor version */
+ result = FALSE;
+ else {
+ ++p;
+ if (*p) { /* more to do */
+ if (*p != L'-')
+ result = FALSE;
+ else {
+ ++p;
+ if ((*p != '3') && (*++p != '2') && !*++p)
+ result = FALSE;
+ }
+ }
+ }
+ }
+ }
+ return result;
+}
+
+typedef struct {
+ unsigned short min;
+ unsigned short max;
+ wchar_t version[MAX_VERSION_SIZE];
+} PYC_MAGIC;
+
+static PYC_MAGIC magic_values[] = {
+ { 0xc687, 0xc687, L"2.0" },
+ { 0xeb2a, 0xeb2a, L"2.1" },
+ { 0xed2d, 0xed2d, L"2.2" },
+ { 0xf23b, 0xf245, L"2.3" },
+ { 0xf259, 0xf26d, L"2.4" },
+ { 0xf277, 0xf2b3, L"2.5" },
+ { 0xf2c7, 0xf2d1, L"2.6" },
+ { 0xf2db, 0xf303, L"2.7" },
+ { 0x0bb8, 0x0c3b, L"3.0" },
+ { 0x0c45, 0x0c4f, L"3.1" },
+ { 0x0c58, 0x0c6c, L"3.2" },
+ { 0x0c76, 0x0c76, L"3.3" },
+ { 0 }
+};
+
+static INSTALLED_PYTHON *
+find_by_magic(unsigned short magic)
+{
+ INSTALLED_PYTHON * result = NULL;
+ PYC_MAGIC * mp;
+
+ for (mp = magic_values; mp->min; mp++) {
+ if ((magic >= mp->min) && (magic <= mp->max)) {
+ result = locate_python(mp->version);
+ if (result != NULL)
+ break;
+ }
+ }
+ return result;
+}
+
+static void
+maybe_handle_shebang(wchar_t ** argv, wchar_t * cmdline)
+{
+/*
+ * Look for a shebang line in the first argument. If found
+ * and we spawn a child process, this never returns. If it
+ * does return then we process the args "normally".
+ *
+ * argv[0] might be a filename with a shebang.
+ */
+ FILE * fp;
+ errno_t rc = _wfopen_s(&fp, *argv, L"rb");
+ unsigned char buffer[BUFSIZE];
+ wchar_t shebang_line[BUFSIZE + 1];
+ size_t read;
+ char *p;
+ char * start;
+ char * shebang_alias = (char *) shebang_line;
+ BOM* bom;
+ int i, j, nchars = 0;
+ int header_len;
+ BOOL is_virt;
+ wchar_t * command;
+ wchar_t * suffix;
+ INSTALLED_PYTHON * ip;
+
+ if (rc == 0) {
+ read = fread(buffer, sizeof(char), BUFSIZE, fp);
+ debug(L"maybe_handle_shebang: read %d bytes\n", read);
+ fclose(fp);
+
+ if ((read >= 4) && (buffer[3] == '\n') && (buffer[2] == '\r')) {
+ ip = find_by_magic((buffer[1] << 8 | buffer[0]) & 0xFFFF);
+ if (ip != NULL) {
+ debug(L"script file is compiled against Python %s\n",
+ ip->version);
+ invoke_child(ip->executable, NULL, cmdline);
+ }
+ }
+ /* Look for BOM */
+ bom = find_BOM(buffer);
+ if (bom == NULL) {
+ start = buffer;
+ debug(L"maybe_handle_shebang: BOM not found, using UTF-8\n");
+ bom = BOMs; /* points to UTF-8 entry - the default */
+ }
+ else {
+ debug(L"maybe_handle_shebang: BOM found, code page %d\n",
+ bom->code_page);
+ start = &buffer[bom->length];
+ }
+ p = find_terminator(start, BUFSIZE, bom);
+ /*
+ * If no CR or LF was found in the heading,
+ * we assume it's not a shebang file.
+ */
+ if (p == NULL) {
+ debug(L"maybe_handle_shebang: No line terminator found\n");
+ }
+ else {
+ /*
+ * Found line terminator - parse the shebang.
+ *
+ * Strictly, we don't need to handle UTF-16 anf UTF-32,
+ * since Python itself doesn't.
+ * Never mind, one day it might.
+ */
+ header_len = (int) (p - start);
+ switch(bom->code_page) {
+ case CP_UTF8:
+ nchars = MultiByteToWideChar(bom->code_page,
+ 0,
+ start, header_len, shebang_line,
+ BUFSIZE);
+ break;
+ case CP_UTF16BE:
+ if (header_len % 2 != 0) {
+ debug(L"maybe_handle_shebang: UTF-16BE, but an odd number \
+of bytes: %d\n", header_len);
+ /* nchars = 0; Not needed - initialised to 0. */
+ }
+ else {
+ for (i = header_len; i > 0; i -= 2) {
+ shebang_alias[i - 1] = start[i - 2];
+ shebang_alias[i - 2] = start[i - 1];
+ }
+ nchars = header_len / sizeof(wchar_t);
+ }
+ break;
+ case CP_UTF16LE:
+ if ((header_len % 2) != 0) {
+ debug(L"UTF-16LE, but an odd number of bytes: %d\n",
+ header_len);
+ /* nchars = 0; Not needed - initialised to 0. */
+ }
+ else {
+ /* no actual conversion needed. */
+ memcpy(shebang_line, start, header_len);
+ nchars = header_len / sizeof(wchar_t);
+ }
+ break;
+ case CP_UTF32BE:
+ if (header_len % 4 != 0) {
+ debug(L"UTF-32BE, but not divisible by 4: %d\n",
+ header_len);
+ /* nchars = 0; Not needed - initialised to 0. */
+ }
+ else {
+ for (i = header_len, j = header_len / 2; i > 0; i -= 4,
+ j -= 2) {
+ shebang_alias[j - 1] = start[i - 2];
+ shebang_alias[j - 2] = start[i - 1];
+ }
+ nchars = header_len / sizeof(wchar_t);
+ }
+ break;
+ case CP_UTF32LE:
+ if (header_len % 4 != 0) {
+ debug(L"UTF-32LE, but not divisible by 4: %d\n",
+ header_len);
+ /* nchars = 0; Not needed - initialised to 0. */
+ }
+ else {
+ for (i = header_len, j = header_len / 2; i > 0; i -= 4,
+ j -= 2) {
+ shebang_alias[j - 1] = start[i - 3];
+ shebang_alias[j - 2] = start[i - 4];
+ }
+ nchars = header_len / sizeof(wchar_t);
+ }
+ break;
+ }
+ if (nchars > 0) {
+ shebang_line[--nchars] = L'\0';
+ is_virt = parse_shebang(shebang_line, nchars, &command,
+ &suffix);
+ if (command != NULL) {
+ debug(L"parse_shebang: found command: %s\n", command);
+ if (!is_virt) {
+ invoke_child(command, suffix, cmdline);
+ }
+ else {
+ suffix = wcschr(command, L' ');
+ if (suffix != NULL) {
+ *suffix++ = L'\0';
+ suffix = skip_whitespace(suffix);
+ }
+ if (wcsncmp(command, L"python", 6))
+ error(RC_BAD_VIRTUAL_PATH, L"Unknown virtual \
+path '%s'", command);
+ command += 6; /* skip past "python" */
+ if (*command && !validate_version(command))
+ error(RC_BAD_VIRTUAL_PATH, L"Invalid version \
+specification: '%s'.\nIn the first line of the script, 'python' needs to be \
+followed by a valid version specifier.\nPlease check the documentation.",
+ command);
+ /* TODO could call validate_version(command) */
+ ip = locate_python(command);
+ if (ip == NULL) {
+ error(RC_NO_PYTHON, L"Requested Python version \
+(%s) is not installed", command);
+ }
+ else {
+ invoke_child(ip->executable, suffix, cmdline);
+ }
+ }
+ }
+ }
+ }
+ }
+}
+
+static wchar_t *
+skip_me(wchar_t * cmdline)
+{
+ BOOL quoted;
+ wchar_t c;
+ wchar_t * result = cmdline;
+
+ quoted = cmdline[0] == L'\"';
+ if (!quoted)
+ c = L' ';
+ else {
+ c = L'\"';
+ ++result;
+ }
+ result = wcschr(result, c);
+ if (result == NULL) /* when, for example, just exe name on command line */
+ result = L"";
+ else {
+ ++result; /* skip past space or closing quote */
+ result = skip_whitespace(result);
+ }
+ return result;
+}
+
+static DWORD version_high = 0;
+static DWORD version_low = 0;
+
+static void
+get_version_info(wchar_t * version_text, size_t size)
+{
+ WORD maj, min, rel, bld;
+
+ if (!version_high && !version_low)
+ wcsncpy_s(version_text, size, L"0.1", _TRUNCATE); /* fallback */
+ else {
+ maj = HIWORD(version_high);
+ min = LOWORD(version_high);
+ rel = HIWORD(version_low);
+ bld = LOWORD(version_low);
+ _snwprintf_s(version_text, size, _TRUNCATE, L"%d.%d.%d.%d", maj,
+ min, rel, bld);
+ }
+}
+
+static int
+process(int argc, wchar_t ** argv)
+{
+ wchar_t * wp;
+ wchar_t * command;
+ wchar_t * p;
+ int rc = 0;
+ size_t plen;
+ INSTALLED_PYTHON * ip;
+ BOOL valid;
+ DWORD size, attrs;
+ HRESULT hr;
+ wchar_t message[MSGSIZE];
+ wchar_t version_text [MAX_PATH];
+ void * version_data;
+ VS_FIXEDFILEINFO * file_info;
+ UINT block_size;
+
+ wp = get_env(L"PYLAUNCH_DEBUG");
+ if ((wp != NULL) && (*wp != L'\0'))
+ log_fp = stderr;
+
+#if defined(_M_X64)
+ debug(L"launcher build: 64bit\n");
+#else
+ debug(L"launcher build: 32bit\n");
+#endif
+#if defined(_WINDOWS)
+ debug(L"launcher executable: Windows\n");
+#else
+ debug(L"launcher executable: Console\n");
+#endif
+ /* Get the local appdata folder (non-roaming) */
+ hr = SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA,
+ NULL, 0, appdata_ini_path);
+ if (hr != S_OK) {
+ debug(L"SHGetFolderPath failed: %X\n", hr);
+ appdata_ini_path[0] = L'\0';
+ }
+ else {
+ plen = wcslen(appdata_ini_path);
+ p = &appdata_ini_path[plen];
+ wcsncpy_s(p, MAX_PATH - plen, L"\\py.ini", _TRUNCATE);
+ attrs = GetFileAttributesW(appdata_ini_path);
+ if (attrs == INVALID_FILE_ATTRIBUTES) {
+ debug(L"File '%s' non-existent\n", appdata_ini_path);
+ appdata_ini_path[0] = L'\0';
+ } else {
+ debug(L"Using local configuration file '%s'\n", appdata_ini_path);
+ }
+ }
+ plen = GetModuleFileNameW(NULL, launcher_ini_path, MAX_PATH);
+ size = GetFileVersionInfoSizeW(launcher_ini_path, &size);
+ if (size == 0) {
+ winerror(GetLastError(), message, MSGSIZE);
+ debug(L"GetFileVersionInfoSize failed: %s\n", message);
+ }
+ else {
+ version_data = malloc(size);
+ if (version_data) {
+ valid = GetFileVersionInfoW(launcher_ini_path, 0, size,
+ version_data);
+ if (!valid)
+ debug(L"GetFileVersionInfo failed: %X\n", GetLastError());
+ else {
+ valid = VerQueryValueW(version_data, L"\\", &file_info,
+ &block_size);
+ if (!valid)
+ debug(L"VerQueryValue failed: %X\n", GetLastError());
+ else {
+ version_high = file_info->dwFileVersionMS;
+ version_low = file_info->dwFileVersionLS;
+ }
+ }
+ free(version_data);
+ }
+ }
+ p = wcsrchr(launcher_ini_path, L'\\');
+ if (p == NULL) {
+ debug(L"GetModuleFileNameW returned value has no backslash: %s\n",
+ launcher_ini_path);
+ launcher_ini_path[0] = L'\0';
+ }
+ else {
+ wcsncpy_s(p, MAX_PATH - (p - launcher_ini_path), L"\\py.ini",
+ _TRUNCATE);
+ attrs = GetFileAttributesW(launcher_ini_path);
+ if (attrs == INVALID_FILE_ATTRIBUTES) {
+ debug(L"File '%s' non-existent\n", launcher_ini_path);
+ launcher_ini_path[0] = L'\0';
+ } else {
+ debug(L"Using global configuration file '%s'\n", launcher_ini_path);
+ }
+ }
+
+ command = skip_me(GetCommandLineW());
+ debug(L"Called with command line: %s", command);
+ if (argc <= 1) {
+ valid = FALSE;
+ p = NULL;
+ }
+ else {
+ p = argv[1];
+ plen = wcslen(p);
+ if (p[0] != L'-') {
+ read_commands();
+ maybe_handle_shebang(&argv[1], command);
+ }
+ /* No file with shebang, or an unrecognised shebang.
+ * Is the first arg a special version qualifier?
+ */
+ valid = (*p == L'-') && validate_version(&p[1]);
+ if (valid) {
+ ip = locate_python(&p[1]);
+ if (ip == NULL)
+ error(RC_NO_PYTHON, L"Requested Python version (%s) not \
+installed", &p[1]);
+ command += wcslen(p);
+ command = skip_whitespace(command);
+ }
+ }
+ if (!valid) {
+ ip = locate_python(L"");
+ if (ip == NULL)
+ error(RC_NO_PYTHON, L"Can't find a default Python.");
+ if ((argc == 2) && (!_wcsicmp(p, L"-h") || !_wcsicmp(p, L"--help"))) {
+#if defined(_M_X64)
+ BOOL canDo64bit = TRUE;
+#else
+ // If we are a 32bit process on a 64bit Windows, first hit the 64bit keys.
+ BOOL canDo64bit = FALSE;
+ IsWow64Process(GetCurrentProcess(), &canDo64bit);
+#endif
+
+ get_version_info(version_text, MAX_PATH);
+ fwprintf(stdout, L"\
+Python Launcher for Windows Version %s\n\n", version_text);
+ fwprintf(stdout, L"\
+usage: %s [ launcher-arguments ] script [ script-arguments ]\n\n", argv[0]);
+ fputws(L"\
+Launcher arguments:\n\n\
+-2 : Launch the latest Python 2.x version\n\
+-3 : Launch the latest Python 3.x version\n\
+-X.Y : Launch the specified Python version\n", stdout);
+ if (canDo64bit) {
+ fputws(L"\
+-X.Y-32: Launch the specified 32bit Python version", stdout);
+ }
+ fputws(L"\n\nThe following help text is from Python:\n\n", stdout);
+ fflush(stdout);
+ }
+ }
+ invoke_child(ip->executable, NULL, command);
+ return rc;
+}
+
+#if defined(_WINDOWS)
+
+int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
+ LPWSTR lpstrCmd, int nShow)
+{
+ return process(__argc, __wargv);
+}
+
+#else
+
+int cdecl wmain(int argc, wchar_t ** argv)
+{
+ return process(argc, argv);
+}
+
+#endif \ No newline at end of file
generated by cgit v0.12 at 2024-11-10 23:36:47 (GMT)