filter paste characters causing interrupt signals,

according to the current stty settings;
added STTY to FilterPasteControls settings (xterm 388), as default

docs/mintty.1

@@ -2849,7 +2849,7 @@ programming languages.
 This string can list characters that are to be excluded from word selection.
 
 .TQ
-\fBFiltering pasted text\fP (FilterPasteControls=)
+\fBFiltering pasted text\fP (FilterPasteControls=STTY)
 With this setting, pasted text can be filtered for selected control 
 characters which are then replaced by space. Filtering is not applied 
 when Control is held while pasting. The option is a comma-separated list 
@@ -2873,6 +2873,8 @@ of character tags:
 .br
 \(en \fBC1\fP control characters 0x80...0x9F
 .br
+\(en \fBSTTY\fP characters that are configured to cause INT, QUIT, TSTP signals, according to the current stty settings
+.br
 (Corresponds to the xterm resource \fBdisallowedPasteControls\fP.)
 
 .TQ

src/child.c

@@ -499,6 +499,14 @@ child_tty(void)
   return ptsname(pty_fd);
 }
 
+uchar *
+child_termios_chars(void)
+{
+static struct termios attr;
+  tcgetattr(pty_fd, &attr);
+  return attr.c_cc;
+}
+
 #define patch_319
 
 #ifdef debug_pty

src/child.h

@@ -22,6 +22,7 @@ extern bool child_is_parent(void);
 extern char * procres(int pid, char * res);
 extern wchar * grandchild_process_list(void);
 extern char * child_tty(void);
+extern uchar * child_termios_chars(void);
 extern char * foreground_prog(void);  // to be free()d
 extern void user_command(wstring commands, int n);
 extern wstring child_conv_path(wstring, bool adjust_dir);

src/config.c

@@ -206,7 +206,7 @@ const config default_cfg = {
   .suppress_osc = "",
   .suppress_nrc = "",  // unused
   .suppress_wheel = "",
-  .filter_paste = "",
+  .filter_paste = "STTY",
   .guard_path = 7,
   .bracketed_paste_split = 0,
   .suspbuf_max = 8080,

src/termclip.c

@@ -279,35 +279,83 @@ term_open(void)
     free(selstr);
 }
 
-static bool
-contains(string s, wchar c)
+static bool filter_NUL;
+static char filter[69];
+
+static void
+set_filter(string s)
 {
-  string tag;
-  switch (c) {
-    when '\b': tag = "BS";
-    when '\t': tag = "HT";
-    when '\n': tag = "NL";
-    when '\r': tag = "CR";
-    when '\f': tag = "FF";
-    when '\e': tag = "ESC";
-    when '\177': tag = "DEL";
-    otherwise:
-      if (c < ' ')
-        tag = "C0";
-      else if (c >= 0x80 && c < 0xA0)
-        tag = "C1";
+  bool do_filter(string tag)
+  {
+#if CYGWIN_VERSION_API_MINOR >= 171
+    char * match = strcasestr(s, tag);
+#else
+    char * match = strstr(s, tag);
+#endif
+    //return match;  // a bit simplistic, we should probably properly parse...
+    if (!match)
+      return false;
+    return (match == s || *(match - 1) < '@')
+           && match[strlen(tag)] < '@';
+  }
+
+  filter_NUL = false;
+  *filter = 0;
+  if (do_filter("C0")) {
+    filter_NUL = true;
+    strcat(filter, "
\t\n\r");
+  }
+  else {
+    if (do_filter("BS")) strcat(filter, "\b");
+    if (do_filter("HT")) strcat(filter, "\t");
+    if (do_filter("NL")) strcat(filter, "\n");
+    if (do_filter("CR")) strcat(filter, "\r");
+    if (do_filter("FF")) strcat(filter, "\f");
+    if (do_filter("ESC")) strcat(filter, "\e");
+  }
+  if (do_filter("DEL"))
+    strcat(filter, "\177");
+  if (do_filter("C1")) {
+    filter_NUL = true;
+    strcat(filter, "€‚ƒ„\205†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ");
+  }
+  if (do_filter("STTY")) {
+    int i = strlen(filter);
+    void addchar(wchar c)
+    {
+      if (c)
+        filter[i++] = c;
       else
-        return false;
+        filter_NUL = true;
+    }
+    uchar * c_cc = child_termios_chars();
+    addchar(c_cc[VINTR]);
+    addchar(c_cc[VQUIT]);
+    addchar(c_cc[VSUSP]);
+    addchar(c_cc[VSWTC]);
+    filter[i] = 0;
   }
-  return strstr(s, tag);
-  // a bit simplistic, we should probably properly parse...
+}
+
+static bool
+isin_filter(wchar c)
+{
+  if (c & 0xFFFFFF00)
+    return false;
+  if (!c)
+    return filter_NUL;
+  return strchr(filter, c);
 }
 
 void
 term_paste(wchar *data, uint len, bool all)
 {
   term_cancel_paste();
 
+  // set/refresh list of characters to be filtered;
+  // stty settings may have changed
+  set_filter(cfg.filter_paste);
+
   uint size = len;
   term.paste_buffer = newn(wchar, len);
   term.paste_len = term.paste_pos = 0;
@@ -331,7 +379,7 @@ term_paste(wchar *data, uint len, bool all)
     wchar wc = data[i];
     if (wc == '\n')
       wc = '\r';
-    if (!all && *cfg.filter_paste && contains(cfg.filter_paste, wc))
+    if (!all && *cfg.filter_paste && isin_filter(wc))
       wc = ' ';
 
     if (data[i] != '\n')

wiki/Changelog.md

@@ -1,6 +1,7 @@
   * Fix memory leak (mintty/wsltty#340) caused by dynamic emoji checking.
   * Revise and unify handling of dynamic pathnames for terminal control.
   * Guard network access via dynamic pathnames.
+  * Filter paste characters causing interrupt signals, according to the current stty settings.
 
 Unicode and Emoji data
   * Unicode 15.1 update.
@@ -21,6 +22,7 @@ Font rendering
 Configuration
   * Alternative font specification supports initial + for size increase (mintty/wsltty#341).
   * New option GuardNetworkPaths.
+  * Added STTY to FilterPasteControls settings (xterm 388), as default.
 
 ### 3.6.5 (3 September 2023) ###