Fix handling of commands containing double quotes in gdb-mi

* lisp/progmodes/gdb-mi.el (gdb-mi-quote): New function.
(gdb-send): Apply it to the operand of the '-interpreter-exec
console' command, so that we can pass arguments with (say) quotes
in them.  Store exact string sent in gdb-debug-log (Bug#10765).

2 files changed, 21 insertions, 4 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 9f1c4e71444..a6783b87baa 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2012-02-26  Jim Blandy  <jimb@red-bean.com>
+
+        * progmodes/gdb-mi.el (gdb-mi-quote): New function.
+        (gdb-send): Apply it to the operand of the '-interpreter-exec
+        console' command, so that we can pass arguments with (say) quotes
+        in them.  Store exact string sent in gdb-debug-log (Bug#10765).
+
 2012-02-26  Chong Yidong  <cyd@gnu.org>
 
         * help-fns.el (describe-function-1): Clarify description of
diff --git a/lisp/progmodes/gdb-mi.el b/lisp/progmodes/gdb-mi.el
index 301714ec55f..0c45c3f5e5d 100644
--- a/lisp/progmodes/gdb-mi.el
+++ b/lisp/progmodes/gdb-mi.el
@@ -1672,8 +1672,6 @@ static char *magick[] = {
   (if (not (string= "" string))
       (setq gdb-last-command string)
     (if gdb-last-command (setq string gdb-last-command)))
-  (if gdb-enable-debug
-      (push (cons 'mi-send (concat string "\n")) gdb-debug-log))
   (if (string-match "^-" string)
       ;; MI command
       (progn
@@ -1683,10 +1681,22 @@ static char *magick[] = {
     (if (string-match "\\\\$" string)
         (setq gdb-continuation (concat gdb-continuation string "\n"))
       (setq gdb-first-done-or-error t)
-      (process-send-string proc (concat "-interpreter-exec console \""
-                                        gdb-continuation string "\"\n"))
+      (let ((to-send (concat "-interpreter-exec console "
+                             (gdb-mi-quote string)
+                             "\n")))
+        (if gdb-enable-debug
+            (push (cons 'mi-send to-send) gdb-debug-log))
+        (process-send-string proc to-send))
       (setq gdb-continuation nil))))
 
+(defun gdb-mi-quote (string)
+  "Return STRING quoted properly as an MI argument.
+The string is enclosed in double quotes.
+All embedded quotes, newlines, and backslashes are preceded with a backslash."
+  (setq string (replace-regexp-in-string "\\([\"\\]\\)" "\\\\\\&" string))
+  (setq string (replace-regexp-in-string "\n" "\\n" string t t))
+  (concat "\"" string "\""))
+
 (defun gdb-input (command handler-function)
   "Send COMMAND to GDB via the MI interface.
 Run the function HANDLER-FUNCTION, with no arguments, once the command is