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Implement process.title for cygwin

v0.7.4-release
Bert Belder 15 years ago
committed by Ryan Dahl
parent
commit
d8642a8aa6
  1. 132
      src/platform_cygwin.cc

132
src/platform_cygwin.cc

@ -3,11 +3,31 @@
#include <sys/param.h> // for MAXPATHLEN
#include <unistd.h> // getpagesize
#include <windows.h>
namespace node {
static char buf[MAXPATHLEN + 1];
static char *process_title = NULL;
// Does the about the same as perror(), but for windows api functions
static void _winapi_perror(const char* prefix = NULL) {
DWORD errno = GetLastError();
char *errmsg;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, errno, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&errmsg, 0, NULL);
// FormatMessage messages include a newline character
if (prefix) {
fprintf(stderr, "%s: %s", prefix, errmsg);
} else {
fputs(errmsg, stderr);
}
}
char** OS::SetupArgs(int argc, char *argv[]) {
@ -16,13 +36,123 @@ char** OS::SetupArgs(int argc, char *argv[]) {
void OS::SetProcessTitle(char *title) {
;
// We need to convert _title_ to UTF-16 first, because that's what windows uses internally.
// It would be more efficient to use the UTF-16 value that we can obtain from v8,
// but it's not accessible from here.
// Max title length; according to the specs it should be 64K but in practice it's a little over 30000,
// but who needs titles that long anyway?
const int MAX_TITLE_LENGTH = 30001;
int length;
WCHAR *title_w;
// Find out how big the buffer for the wide-char title must be
length = MultiByteToWideChar(CP_UTF8, 0, title, -1, NULL, 0);
if (!length) {
_winapi_perror("MultiByteToWideChar");
return;
}
// Convert to wide-char string
title_w = new WCHAR[length];
length = MultiByteToWideChar(CP_UTF8, 0, title, -1, title_w, length);
if (!length) {
_winapi_perror("MultiByteToWideChar");
delete title_w;
return;
};
// If the title must be truncated insert a \0 terminator there
if (length > MAX_TITLE_LENGTH) {
title_w[MAX_TITLE_LENGTH - 1] = *L"\0";
}
if (!SetConsoleTitleW(title_w)) {
_winapi_perror("SetConsoleTitleW");
}
free(process_title);
process_title = strdup(title);
delete title_w;
}
static inline char* _getProcessTitle() {
WCHAR *title_w;
char *title;
int length, length_w;
length_w = GetConsoleTitleW(L"\0", sizeof(WCHAR));
// If length is zero, there may be an error or the title may be empty
if (!length_w) {
if (GetLastError()) {
_winapi_perror("GetConsoleTitleW");
return NULL;
}
else {
// The title is empty, so return empty string
process_title = strdup("\0");
return process_title;
}
}
// Room for \0 terminator
length_w++;
title_w = new WCHAR[length_w];
if (!GetConsoleTitleW(title_w, length_w * sizeof(WCHAR))) {
_winapi_perror("GetConsoleTitleW");
delete title_w;
return NULL;
}
// Find out what the size of the buffer is that we need
length = WideCharToMultiByte(CP_UTF8, 0, title_w, length_w, NULL, 0, NULL, NULL);
if (!length) {
_winapi_perror("WideCharToMultiByte");
delete title_w;
return NULL;
}
title = (char *) malloc(length);
if (!title) {
perror("malloc");
delete title_w;
return NULL;
}
// Do utf16 -> utf8 conversion here
if (!WideCharToMultiByte(CP_UTF8, 0, title_w, -1, title, length, NULL, NULL)) {
_winapi_perror("WideCharToMultiByte");
delete title_w;
free(title);
return NULL;
}
delete title_w;
return title;
}
const char* OS::GetProcessTitle(int *len) {
// If the process_title was never read before nor explicitly set,
// we must query it with getConsoleTitleW
if (!process_title) {
process_title = _getProcessTitle();
}
if (process_title) {
*len = strlen(process_title);
return process_title;
} else {
*len = 0;
return NULL;
}
}

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