Don't use struct buffer in event-top.c

This changes event-top.c to use std::string rather than struct buffer.
This isn't completely ideal, in that it requires a copy of the string
to be made.

diff --git a/gdb/event-top.c b/gdb/event-top.c
index 14984707df1a287afa1b52287d35306cac6193bd..f0a3f0d418c6d8dc81ff102d3e526b5b27947800 100644 (file)
--- a/gdb/event-top.c
+++ b/gdb/event-top.c
@@ -36,7 +36,6 @@
 #include "gdbcmd.h"            /* for dont_repeat() */
 #include "annotate.h"
 #include "maint.h"
-#include "gdbsupport/buffer.h"
 #include "ser-event.h"
 #include "gdbsupport/gdb_select.h"
 #include "gdbsupport/gdb-sigmask.h"
@@ -868,12 +867,9 @@ void
 gdb_readline_no_editing_callback (gdb_client_data client_data)
 {
   int c;
-  char *result;
-  struct buffer line_buffer;
+  std::string line_buffer;
   struct ui *ui = current_ui;
 
-  buffer_init (&line_buffer);
-
   FILE *stream = ui->instream != nullptr ? ui->instream : ui->stdin_stream;
   gdb_assert (stream != nullptr);
 
@@ -893,32 +889,28 @@ gdb_readline_no_editing_callback (gdb_client_data client_data)
 
       if (c == EOF)
        {
-         if (line_buffer.used_size > 0)
+         if (!line_buffer.empty ())
            {
              /* The last line does not end with a newline.  Return it, and
                 if we are called again fgetc will still return EOF and
                 we'll return NULL then.  */
              break;
            }
-         xfree (buffer_finish (&line_buffer));
          ui->input_handler (NULL);
          return;
        }
 
       if (c == '\n')
        {
-         if (line_buffer.used_size > 0
-             && line_buffer.buffer[line_buffer.used_size - 1] == '\r')
-           line_buffer.used_size--;
+         if (!line_buffer.empty () && line_buffer.back () == '\r')
+           line_buffer.pop_back ();
          break;
        }
 
-      buffer_grow_char (&line_buffer, c);
+      line_buffer += c;
     }
 
-  buffer_grow_char (&line_buffer, '\0');
-  result = buffer_finish (&line_buffer);
-  ui->input_handler (gdb::unique_xmalloc_ptr<char> (result));
+  ui->input_handler (make_unique_xstrdup (line_buffer.c_str ()));
 }
 \f