Merge from origin/emacs-24

4b0b27d Fix invocation of commands whose file name includes extension
87fc99f Better support for the case of typing RET on the prompt in comint.
a7b1c2f Don't lose frame's background color when setting foreground
20c817d Fix handling of frame color parameters in TTY sessions
eca7da1 Complete the remaining documentation updates for 24.5

Conflicts:
	doc/lispref/ChangeLog
	etc/NEWS
	lisp/ChangeLog
	nt/ChangeLog
	src/ChangeLog

1 files changed, 66 insertions, 6 deletions

diff --git a/nt/cmdproxy.c b/nt/cmdproxy.c
index faef2f83496..3157a69c1b6 100644
--- a/nt/cmdproxy.c
+++ b/nt/cmdproxy.c
@@ -135,7 +135,10 @@ skip_nonspace (const char *str)
   return str;
 }
 
-int escape_char = '\\';
+/* This value is never changed by the code.  We keep the code that
+   supports also the value of '"', but let's allow the compiler to
+   optimize it out, until someone actually uses that.  */
+const int escape_char = '\\';
 
 /* Get next token from input, advancing pointer.  */
 int
@@ -196,11 +199,31 @@ get_next_token (char * buf, const char ** pSrc)
               /* End of string, but no ending quote found.  We might want to
                  flag this as an error, but for now will consider the end as
                  the end of the token.  */
+              if (escape_char == '\\')
+                {
+                  /* Output literal backslashes.  Note that if the
+                     token ends with an unpaired backslash, we eat it
+                     up here.  But since this case invokes undefined
+                     behavior anyway, it's okay.  */
+                  while (escape_char_run > 1)
+                    {
+                      *o++ = escape_char;
+                      escape_char_run -= 2;
+                    }
+                }
               *o = '\0';
               break;
             }
           else
             {
+              if (escape_char == '\\')
+                {
+                  /* Output literal backslashes.  Note that we don't
+                     treat a backslash as an escape character here,
+                     since it doesn't preceed a quote.  */
+                  for ( ; escape_char_run > 0; escape_char_run--)
+                    *o++ = escape_char;
+                }
               *o++ = *p++;
             }
         }
@@ -251,13 +274,44 @@ search_dir (const char *dir, const char *exec, int bufsize, char *buffer)
   int n_exts = sizeof (exts) / sizeof (char *);
   char *dummy;
   int i, rc;
+  const char *pext = strrchr (exec, '\\');
+
+  /* Does EXEC already include an extension?  */
+  if (!pext)
+    pext = exec;
+  pext = strchr (pext, '.');
 
   /* Search the directory for the program.  */
-  for (i = 0; i < n_exts; i++)
+  if (pext)
     {
-      rc = SearchPath (dir, exec, exts[i], bufsize, buffer, &dummy);
+      /* SearchPath will not append an extension if the file already
+         has an extension, so we must append it ourselves.  */
+      char exec_ext[MAX_PATH], *p;
+
+      p = strcpy (exec_ext, exec) + strlen (exec);
+
+      /* Search first without any extension; if found, we are done.  */
+      rc = SearchPath (dir, exec_ext, NULL, bufsize, buffer, &dummy);
       if (rc > 0)
         return rc;
+
+      /* Try the known extensions.  */
+      for (i = 0; i < n_exts; i++)
+        {
+          strcpy (p, exts[i]);
+          rc = SearchPath (dir, exec_ext, NULL, bufsize, buffer, &dummy);
+          if (rc > 0)
+            return rc;
+        }
+    }
+  else
+    {
+      for (i = 0; i < n_exts; i++)
+        {
+          rc = SearchPath (dir, exec, exts[i], bufsize, buffer, &dummy);
+          if (rc > 0)
+            return rc;
+        }
     }
 
   return 0;
@@ -798,7 +852,7 @@ main (int argc, char ** argv)
              quotes, since they are illegal in path names).  */
 
           remlen = maxlen =
-            strlen (progname) + extra_arg_space + strlen (cmdline) + 16;
+            strlen (progname) + extra_arg_space + strlen (cmdline) + 16 + 2;
           buf = p = alloca (maxlen + 1);
 
           /* Quote progname in case it contains spaces.  */
@@ -813,10 +867,16 @@ main (int argc, char ** argv)
               remlen = maxlen - (p - buf);
             }
 
+          /* Now that we know we will be invoking the shell, quote the
+             command line after the "/c" switch as the shell expects:
+             a single pair of quotes enclosing the entire command
+             tail, no matter whether quotes are used in the command
+             line, and how many of them are there.  See the output of
+             "cmd /?" for how cmd.exe treats quotes.  */
           if (run_command_dot_com)
-            _snprintf (p, remlen, " /e:%d /c %s", envsize, cmdline);
+            _snprintf (p, remlen, " /e:%d /c \"%s\"", envsize, cmdline);
           else
-            _snprintf (p, remlen, " /c %s", cmdline);
+            _snprintf (p, remlen, " /c \"%s\"", cmdline);
           cmdline = buf;
         }
       else