+// ----------------------------------------------------------------------------
+// wxQsort, adapted by RR to allow user_data
+// ----------------------------------------------------------------------------
+
+/* This file is part of the GNU C Library.
+ Written by Douglas C. Schmidt (schmidt@ics.uci.edu).
+
+ Douglas Schmidt kindly gave permission to relicence the
+ code under the wxWindows licence:
+
+From: "Douglas C. Schmidt" <schmidt@dre.vanderbilt.edu>
+To: Robert Roebling <robert.roebling@uni-ulm.de>
+Subject: Re: qsort licence
+Date: Mon, 23 Jul 2007 03:44:25 -0500
+Sender: schmidt@dre.vanderbilt.edu
+Message-Id: <20070723084426.64F511000A8@tango.dre.vanderbilt.edu>
+
+Hi Robert,
+
+> [...] I'm asking if you'd be willing to relicence your code
+> under the wxWindows licence. [...]
+
+That's fine with me [...]
+
+Thanks,
+
+ Doug */
+
+
+/* Byte-wise swap two items of size SIZE. */
+#define SWAP(a, b, size) \
+ do \
+ { \
+ register size_t __size = (size); \
+ register char *__a = (a), *__b = (b); \
+ do \
+ { \
+ char __tmp = *__a; \
+ *__a++ = *__b; \
+ *__b++ = __tmp; \
+ } while (--__size > 0); \
+ } while (0)
+
+/* Discontinue quicksort algorithm when partition gets below this size.
+ This particular magic number was chosen to work best on a Sun 4/260. */
+#define MAX_THRESH 4
+
+/* Stack node declarations used to store unfulfilled partition obligations. */
+typedef struct
+ {
+ char *lo;
+ char *hi;
+ } stack_node;
+
+/* The next 4 #defines implement a very fast in-line stack abstraction. */
+#define STACK_SIZE (8 * sizeof(unsigned long int))
+#define PUSH(low, high) ((void) ((top->lo = (low)), (top->hi = (high)), ++top))
+#define POP(low, high) ((void) (--top, (low = top->lo), (high = top->hi)))
+#define STACK_NOT_EMPTY (stack < top)
+
+
+/* Order size using quicksort. This implementation incorporates
+ four optimizations discussed in Sedgewick:
+
+ 1. Non-recursive, using an explicit stack of pointer that store the
+ next array partition to sort. To save time, this maximum amount
+ of space required to store an array of MAX_INT is allocated on the
+ stack. Assuming a 32-bit integer, this needs only 32 *
+ sizeof(stack_node) == 136 bits. Pretty cheap, actually.
+
+ 2. Chose the pivot element using a median-of-three decision tree.
+ This reduces the probability of selecting a bad pivot value and
+ eliminates certain extraneous comparisons.
+
+ 3. Only quicksorts TOTAL_ELEMS / MAX_THRESH partitions, leaving
+ insertion sort to order the MAX_THRESH items within each partition.
+ This is a big win, since insertion sort is faster for small, mostly
+ sorted array segments.
+
+ 4. The larger of the two sub-partitions is always pushed onto the
+ stack first, with the algorithm then concentrating on the
+ smaller partition. This *guarantees* no more than log (n)
+ stack size is needed (actually O(1) in this case)! */
+
+void wxQsort(void *const pbase, size_t total_elems,
+ size_t size, CMPFUNCDATA cmp, const void* user_data)
+{
+ register char *base_ptr = (char *) pbase;
+ const size_t max_thresh = MAX_THRESH * size;
+
+ if (total_elems == 0)
+ /* Avoid lossage with unsigned arithmetic below. */
+ return;
+
+ if (total_elems > MAX_THRESH)
+ {
+ char *lo = base_ptr;
+ char *hi = &lo[size * (total_elems - 1)];
+ stack_node stack[STACK_SIZE];
+ stack_node *top = stack;
+
+ PUSH (NULL, NULL);
+
+ while (STACK_NOT_EMPTY)
+ {
+ char *left_ptr;
+ char *right_ptr;
+
+ /* Select median value from among LO, MID, and HI. Rearrange
+ LO and HI so the three values are sorted. This lowers the
+ probability of picking a pathological pivot value and
+ skips a comparison for both the LEFT_PTR and RIGHT_PTR. */
+
+ char *mid = lo + size * ((hi - lo) / size >> 1);
+
+ if ((*cmp) ((void *) mid, (void *) lo, user_data) < 0)
+ SWAP (mid, lo, size);
+ if ((*cmp) ((void *) hi, (void *) mid, user_data) < 0)
+ SWAP (mid, hi, size);
+ else
+ goto jump_over;
+ if ((*cmp) ((void *) mid, (void *) lo, user_data) < 0)
+ SWAP (mid, lo, size);
+ jump_over:;
+ left_ptr = lo + size;
+ right_ptr = hi - size;
+
+ /* Here's the famous ``collapse the walls'' section of quicksort.
+ Gotta like those tight inner loops! They are the main reason
+ that this algorithm runs much faster than others. */
+ do
+ {
+ while ((*cmp) ((void *) left_ptr, (void *) mid, user_data) < 0)
+ left_ptr += size;
+
+ while ((*cmp) ((void *) mid, (void *) right_ptr, user_data) < 0)
+ right_ptr -= size;
+
+ if (left_ptr < right_ptr)
+ {
+ SWAP (left_ptr, right_ptr, size);
+ if (mid == left_ptr)
+ mid = right_ptr;
+ else if (mid == right_ptr)
+ mid = left_ptr;
+ left_ptr += size;
+ right_ptr -= size;
+ }
+ else if (left_ptr == right_ptr)
+ {
+ left_ptr += size;
+ right_ptr -= size;
+ break;
+ }
+ }
+ while (left_ptr <= right_ptr);
+
+ /* Set up pointers for next iteration. First determine whether
+ left and right partitions are below the threshold size. If so,
+ ignore one or both. Otherwise, push the larger partition's
+ bounds on the stack and continue sorting the smaller one. */
+
+ if ((size_t) (right_ptr - lo) <= max_thresh)
+ {
+ if ((size_t) (hi - left_ptr) <= max_thresh)
+ /* Ignore both small partitions. */
+ POP (lo, hi);
+ else
+ /* Ignore small left partition. */
+ lo = left_ptr;
+ }
+ else if ((size_t) (hi - left_ptr) <= max_thresh)
+ /* Ignore small right partition. */
+ hi = right_ptr;
+ else if ((right_ptr - lo) > (hi - left_ptr))
+ {
+ /* Push larger left partition indices. */
+ PUSH (lo, right_ptr);
+ lo = left_ptr;
+ }
+ else
+ {
+ /* Push larger right partition indices. */
+ PUSH (left_ptr, hi);
+ hi = right_ptr;
+ }
+ }
+ }
+
+ /* Once the BASE_PTR array is partially sorted by quicksort the rest
+ is completely sorted using insertion sort, since this is efficient
+ for partitions below MAX_THRESH size. BASE_PTR points to the beginning
+ of the array to sort, and END_PTR points at the very last element in
+ the array (*not* one beyond it!). */
+
+ {
+ char *const end_ptr = &base_ptr[size * (total_elems - 1)];
+ char *tmp_ptr = base_ptr;
+ char *thresh = base_ptr + max_thresh;
+ if ( thresh > end_ptr )
+ thresh = end_ptr;
+ register char *run_ptr;
+
+ /* Find smallest element in first threshold and place it at the
+ array's beginning. This is the smallest array element,
+ and the operation speeds up insertion sort's inner loop. */
+
+ for (run_ptr = tmp_ptr + size; run_ptr <= thresh; run_ptr += size)
+ if ((*cmp) ((void *) run_ptr, (void *) tmp_ptr, user_data) < 0)
+ tmp_ptr = run_ptr;
+
+ if (tmp_ptr != base_ptr)
+ SWAP (tmp_ptr, base_ptr, size);
+
+ /* Insertion sort, running from left-hand-side up to right-hand-side. */
+
+ run_ptr = base_ptr + size;
+ while ((run_ptr += size) <= end_ptr)
+ {
+ tmp_ptr = run_ptr - size;
+ while ((*cmp) ((void *) run_ptr, (void *) tmp_ptr, user_data) < 0)
+ tmp_ptr -= size;
+
+ tmp_ptr += size;
+ if (tmp_ptr != run_ptr)
+ {
+ char *trav;
+
+ trav = run_ptr + size;
+ while (--trav >= run_ptr)
+ {
+ char c = *trav;
+ char *hi, *lo;
+
+ for (hi = lo = trav; (lo -= size) >= tmp_ptr; hi = lo)
+ *hi = *lo;
+ *hi = c;
+ }
+ }
+ }
+ }
+}
+
+#endif // wxUSE_BASE
+
+
+
+// ============================================================================
+// GUI-only functions from now on
+// ============================================================================
+
+#if wxUSE_GUI
+
+// ----------------------------------------------------------------------------
+// Launch default browser
+// ----------------------------------------------------------------------------
+
+#if defined(__WXMSW__)
+
+// implemented in a port-specific utils source file:
+bool wxDoLaunchDefaultBrowser(const wxString& url, const wxString& scheme, int flags);
+
+#elif defined(__WXX11__) || defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXCOCOA__) || \
+ (defined(__WXMAC__) && !defined(__WXOSX_IPHONE__))
+
+// implemented in a port-specific utils source file:
+bool wxDoLaunchDefaultBrowser(const wxString& url, int flags);
+
+#else
+
+// a "generic" implementation:
+bool wxDoLaunchDefaultBrowser(const wxString& url, int flags)
+{
+ // on other platforms try to use mime types or wxExecute...
+
+ bool ok = false;
+ wxString cmd;
+
+#if wxUSE_MIMETYPE
+ wxFileType *ft = wxTheMimeTypesManager->GetFileTypeFromExtension(_T("html"));
+ if ( ft )
+ {
+ wxString mt;
+ ft->GetMimeType(&mt);
+
+ ok = ft->GetOpenCommand(&cmd, wxFileType::MessageParameters(url));
+ delete ft;
+ }
+#endif // wxUSE_MIMETYPE
+
+ if ( !ok || cmd.empty() )
+ {
+ // fallback to checking for the BROWSER environment variable
+ if ( !wxGetEnv(wxT("BROWSER"), &cmd) || cmd.empty() )
+ cmd << _T(' ') << url;
+ }
+
+ ok = ( !cmd.empty() && wxExecute(cmd) );
+ if (ok)
+ return ok;
+
+ // no file type for HTML extension
+ wxLogError(_("No default application configured for HTML files."));
+
+ return false;
+}
+#endif
+
+static bool DoLaunchDefaultBrowserHelper(const wxString& urlOrig, int flags)
+{
+ // NOTE: we don't have to care about the wxBROWSER_NOBUSYCURSOR flag
+ // as it was already handled by wxLaunchDefaultBrowser
+
+ wxUnusedVar(flags);
+
+ wxString url(urlOrig), scheme;
+ wxURI uri(url);
+
+ // this check is useful to avoid that wxURI recognizes as scheme parts of
+ // the filename, in case urlOrig is a local filename
+ // (e.g. "C:\\test.txt" when parsed by wxURI reports a scheme == "C")
+ bool hasValidScheme = uri.HasScheme() &&
+ (uri.GetScheme() == "http" || uri.GetScheme() == "file");
+
+#if defined(__WXMSW__)
+
+ // NOTE: when testing wxMSW's wxLaunchDefaultBrowser all possible forms
+ // of the URL/flags should be tested; e.g.:
+ //
+ // for (int i=0; i<2; i++)
+ // {
+ // wxLaunchDefaultBrowser("C:\\test.txt", i==0 ? 0 : wxBROWSER_NEW_WINDOW);
+ // wxLaunchDefaultBrowser("wxwidgets.org", i==0 ? 0 : wxBROWSER_NEW_WINDOW);
+ // wxLaunchDefaultBrowser("file:/C%3A/test.txt", i==0 ? 0 : wxBROWSER_NEW_WINDOW);
+ // wxLaunchDefaultBrowser("http://wxwidgets.org", i==0 ? 0 : wxBROWSER_NEW_WINDOW);
+ // }
+ // (assuming you have a C:\test.txt file)
+
+ if ( !hasValidScheme )
+ {
+ if (wxFileExists(urlOrig) || wxDirExists(urlOrig))
+ {
+ scheme = "file";
+ // do not prepend the file scheme to the URL as ShellExecuteEx() doesn't like it
+ }
+ else
+ {
+ url.Prepend(wxS("http://"));
+ scheme = "http";
+ }
+ }
+ else if ( hasValidScheme )
+ {
+ scheme = uri.GetScheme();
+
+ if ( uri.GetScheme() == "file" )
+ {
+ // TODO: extract URLToFileName() to some always compiled in
+ // function
+#if wxUSE_FILESYSTEM
+ // ShellExecuteEx() doesn't like the "file" scheme when opening local files;
+ // remove it
+ url = wxFileSystem::URLToFileName(url).GetFullPath();
+#endif // wxUSE_FILESYSTEM
+ }
+ }
+
+ if (wxDoLaunchDefaultBrowser(url, scheme, flags))
+ return true;
+ //else: call wxLogSysError
+#else
+ if ( !hasValidScheme )
+ {
+ // set the scheme of url to "http" or "file" if it does not have one
+ if (wxFileExists(urlOrig) || wxDirExists(urlOrig))
+ url.Prepend(wxS("file://"));
+ else
+ url.Prepend(wxS("http://"));
+ }
+
+ if (wxDoLaunchDefaultBrowser(url, flags))
+ return true;
+ //else: call wxLogSysError
+#endif
+
+ wxLogSysError(_("Failed to open URL \"%s\" in default browser."),
+ url.c_str());
+
+ return false;
+}
+
+bool wxLaunchDefaultBrowser(const wxString& url, int flags)
+{
+ // NOTE: as documented, "url" may be both a real well-formed URL
+ // and a local file name
+
+ if ( flags & wxBROWSER_NOBUSYCURSOR )
+ return DoLaunchDefaultBrowserHelper(url, flags);
+
+ wxBusyCursor bc;
+ return DoLaunchDefaultBrowserHelper(url, flags);
+}
projects / wxWidgets.git / blobdiff