--- /dev/null
+/* xscreensaver, Copyright (c) 1991-1995 Jamie Zawinski <jwz@mcom.com>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation. No representations are made about the suitability of this
+ * software for any purpose. It is provided "as is" without express or
+ * implied warranty.
+ */
+
+/* stderr hackery - Why Unix Sucks, reason number 32767.
+ */
+
+#if __STDC__
+#include <stdlib.h>
+#include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <time.h>
+
+#include <X11/Intrinsic.h>
+
+#include "xscreensaver.h"
+
+extern XtAppContext app;
+extern Colormap cmap;
+extern Window screensaver_window;
+
+extern char *get_string_resource P((char *, char *));
+extern Bool get_boolean_resource P((char *, char *));
+extern unsigned int get_pixel_resource P((char *, char *,
+ Display *, Colormap));
+
+static char stderr_buffer [1024];
+static char *stderr_tail = 0;
+static time_t stderr_last_read = 0;
+static XtIntervalId stderr_popup_timer = 0;
+
+FILE *real_stderr = 0;
+FILE *real_stdout = 0;
+
+static int text_x = 0;
+static int text_y = 0;
+
+void
+reset_stderr ()
+{
+ text_x = text_y = 0;
+}
+
+static void
+print_stderr (string)
+ char *string;
+{
+ int h_border = 20;
+ int v_border = 20;
+ static int line_height;
+ static XFontStruct *font = 0;
+ static GC gc = 0;
+ char *head = string;
+ char *tail;
+
+ /* In verbose mode, copy it to stderr as well. */
+ if (verbose_p)
+ fprintf (real_stderr, "%s", string);
+
+ if (! gc)
+ {
+ XGCValues gcv;
+ Pixel fg, bg;
+ char *font_name = get_string_resource ("font", "Font");
+ if (!font_name) font_name = "fixed";
+ font = XLoadQueryFont (dpy, font_name);
+ if (! font) font = XLoadQueryFont (dpy, "fixed");
+ line_height = font->ascent + font->descent;
+ fg = get_pixel_resource ("textForeground", "Foreground", dpy, cmap);
+ bg = get_pixel_resource ("textBackground", "Background", dpy, cmap);
+ gcv.font = font->fid;
+ gcv.foreground = fg;
+ gcv.background = bg;
+ gc = XCreateGC (dpy, screensaver_window,
+ (GCFont | GCForeground | GCBackground), &gcv);
+ }
+
+ for (tail = string; *tail; tail++)
+ {
+ if (*tail == '\n' || *tail == '\r')
+ {
+ int maxy = HeightOfScreen (screen) - v_border - v_border;
+ if (tail != head)
+ XDrawImageString (dpy, screensaver_window, gc,
+ text_x + h_border,
+ text_y + v_border + font->ascent,
+ head, tail - head);
+ text_x = 0;
+ text_y += line_height;
+ head = tail + 1;
+ if (*tail == '\r' && *head == '\n')
+ head++, tail++;
+
+ if (text_y > maxy - line_height)
+ {
+#if 0
+ text_y = 0;
+#else
+ int offset = line_height * 5;
+ XCopyArea (dpy, screensaver_window, screensaver_window, gc,
+ 0, v_border + offset,
+ WidthOfScreen (screen),
+ (HeightOfScreen (screen) - v_border - v_border
+ - offset),
+ 0, v_border);
+ XClearArea (dpy, screensaver_window,
+ 0, HeightOfScreen (screen) - v_border - offset,
+ WidthOfScreen (screen), offset, False);
+ text_y -= offset;
+#endif
+ }
+ }
+ }
+ if (tail != head)
+ {
+ int direction, ascent, descent;
+ XCharStruct overall;
+ XDrawImageString (dpy, screensaver_window, gc,
+ text_x + h_border, text_y + v_border + font->ascent,
+ head, tail - head);
+ XTextExtents (font, tail, tail - head,
+ &direction, &ascent, &descent, &overall);
+ text_x += overall.width;
+ }
+}
+
+
+static void
+stderr_popup_timer_fn (closure, id)
+ XtPointer closure;
+ XtIntervalId *id;
+{
+ char *s = stderr_buffer;
+ if (*s)
+ {
+ /* If too much data was printed, then something has gone haywire,
+ so truncate it. */
+ char *trailer = "\n\n<< stderr diagnostics have been truncated >>\n\n";
+ int max = sizeof (stderr_buffer) - strlen (trailer) - 5;
+ if (strlen (s) > max)
+ strcpy (s + max, trailer);
+ /* Now show the user. */
+ print_stderr (s);
+ }
+
+ stderr_tail = stderr_buffer;
+ stderr_popup_timer = 0;
+}
+
+
+static void
+stderr_callback (XtPointer closure, int *fd, XtIntervalId *id)
+{
+ char *s;
+ int left;
+ int size;
+ int read_this_time = 0;
+
+ if (stderr_tail == 0)
+ stderr_tail = stderr_buffer;
+
+ left = ((sizeof (stderr_buffer) - 2) - (stderr_tail - stderr_buffer));
+
+ s = stderr_tail;
+ *s = 0;
+
+ /* Read as much data from the fd as we can, up to our buffer size. */
+ if (left > 0)
+ {
+ while ((size = read (*fd, (void *) s, left)) > 0)
+ {
+ left -= size;
+ s += size;
+ read_this_time += size;
+ }
+ *s = 0;
+ }
+ else
+ {
+ char buf2 [1024];
+ /* The buffer is full; flush the rest of it. */
+ while (read (*fd, (void *) buf2, sizeof (buf2)) > 0)
+ ;
+ }
+
+ stderr_tail = s;
+ stderr_last_read = time ((time_t *) 0);
+
+ /* Now we have read some data that we would like to put up in a dialog
+ box. But more data may still be coming in - so don't pop up the
+ dialog right now, but instead, start a timer that will pop it up
+ a second from now. Should more data come in in the meantime, we
+ will be called again, and will reset that timer again. So the
+ dialog will only pop up when a second has elapsed with no new data
+ being written to stderr.
+
+ However, if the buffer is full (meaning lots of data has been written)
+ then we don't reset the timer.
+ */
+ if (read_this_time > 0)
+ {
+ if (stderr_popup_timer)
+ XtRemoveTimeOut (stderr_popup_timer);
+
+ stderr_popup_timer =
+ XtAppAddTimeOut (app, 1 * 1000, stderr_popup_timer_fn, 0);
+ }
+}
+
+void
+initialize_stderr ()
+{
+ static Boolean done = False;
+ int fds [2];
+ int in, out;
+ int new_stdout, new_stderr;
+ int stdout_fd = 1;
+ int stderr_fd = 2;
+ int flags;
+ Boolean stderr_dialog_p = get_boolean_resource ("captureStderr", "Boolean");
+ Boolean stdout_dialog_p = get_boolean_resource ("captureStdout", "Boolean");
+
+ real_stderr = stderr;
+ real_stdout = stdout;
+
+ if (!stderr_dialog_p && !stdout_dialog_p)
+ return;
+
+ if (done) return;
+ done = True;
+
+ if (pipe (fds))
+ {
+ perror ("error creating pipe:");
+ return;
+ }
+
+ in = fds [0];
+ out = fds [1];
+
+# ifdef O_NONBLOCK
+ flags = O_NONBLOCK;
+# else
+# ifdef O_NDELAY
+ flags = O_NDELAY;
+# else
+ ERROR!! neither O_NONBLOCK nor O_NDELAY are defined.
+# endif
+# endif
+
+ /* Set both sides of the pipe to nonblocking - this is so that
+ our reads (in stderr_callback) will terminate, and so that
+ out writes (in the client programs) will silently fail when
+ the pipe is full, instead of hosing the program. */
+ if (fcntl (in, F_SETFL, flags) != 0)
+ {
+ perror ("fcntl:");
+ return;
+ }
+ if (fcntl (out, F_SETFL, flags) != 0)
+ {
+ perror ("fcntl:");
+ return;
+ }
+
+ if (stderr_dialog_p)
+ {
+ FILE *new_stderr_file;
+ new_stderr = dup (stderr_fd);
+ if (new_stderr < 0)
+ {
+ perror ("could not dup() a stderr:");
+ return;
+ }
+ if (! (new_stderr_file = fdopen (new_stderr, "w")))
+ {
+ perror ("could not fdopen() the new stderr:");
+ return;
+ }
+ real_stderr = new_stderr_file;
+
+ close (stderr_fd);
+ if (dup2 (out, stderr_fd) < 0)
+ {
+ perror ("could not dup() a new stderr:");
+ return;
+ }
+ }
+
+ if (stdout_dialog_p)
+ {
+ FILE *new_stdout_file;
+ new_stdout = dup (stdout_fd);
+ if (new_stdout < 0)
+ {
+ perror ("could not dup() a stdout:");
+ return;
+ }
+ if (! (new_stdout_file = fdopen (new_stdout, "w")))
+ {
+ perror ("could not fdopen() the new stdout:");
+ return;
+ }
+ real_stdout = new_stdout_file;
+
+ close (stdout_fd);
+ if (dup2 (out, stdout_fd) < 0)
+ {
+ perror ("could not dup() a new stdout:");
+ return;
+ }
+ }
+
+ XtAppAddInput (app, in, (XtPointer) XtInputReadMask, stderr_callback, 0);
+}
projects / xscreensaver / blobdiff