gdb/mi/mi-console.c

   1 /* MI Console code.
   2
   3    Copyright (C) 2000-2015 Free Software Foundation, Inc.
   4
   5    Contributed by Cygnus Solutions (a Red Hat company).
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 /* An MI console is a kind of ui_file stream that sends output to
  23    stdout, but encapsulated and prefixed with a distinctive string;
  24    for instance, error output is normally identified by a leading
  25    "&".  */
  26
  27 #include "defs.h"
  28 #include "mi-console.h"
  29 static ui_file_fputs_ftype mi_console_file_fputs;
  30 static ui_file_flush_ftype mi_console_file_flush;
  31 static ui_file_delete_ftype mi_console_file_delete;
  32
  33 struct mi_console_file
  34   {
  35     int *magic;
  36     struct ui_file *raw;
  37     struct ui_file *buffer;
  38     const char *prefix;
  39     char quote;
  40   };
  41
  42 /* Use the address of this otherwise-unused global as a magic number
  43    identifying this class of ui_file objects.  */
  44 static int mi_console_file_magic;
  45
  46 /* Create a console that wraps the given output stream RAW with the
  47    string PREFIX and quoting it with QUOTE.  */
  48
  49 struct ui_file *
  50 mi_console_file_new (struct ui_file *raw, const char *prefix, char quote)
  51 {
  52   struct ui_file *ui_file = ui_file_new ();
  53   struct mi_console_file *mi_console = XNEW (struct mi_console_file);
  54
  55   mi_console->magic = &mi_console_file_magic;
  56   mi_console->raw = raw;
  57   mi_console->buffer = mem_fileopen ();
  58   mi_console->prefix = prefix;
  59   mi_console->quote = quote;
  60   set_ui_file_fputs (ui_file, mi_console_file_fputs);
  61   set_ui_file_flush (ui_file, mi_console_file_flush);
  62   set_ui_file_data (ui_file, mi_console, mi_console_file_delete);
  63
  64   return ui_file;
  65 }
  66
  67 static void
  68 mi_console_file_delete (struct ui_file *file)
  69 {
  70   struct mi_console_file *mi_console = ui_file_data (file);
  71
  72   if (mi_console->magic != &mi_console_file_magic)
  73     internal_error (__FILE__, __LINE__,
  74                     _("mi_console_file_delete: bad magic number"));
  75
  76   xfree (mi_console);
  77 }
  78
  79 static void
  80 mi_console_file_fputs (const char *buf, struct ui_file *file)
  81 {
  82   struct mi_console_file *mi_console = ui_file_data (file);
  83
  84   if (mi_console->magic != &mi_console_file_magic)
  85     internal_error (__FILE__, __LINE__,
  86                     "mi_console_file_fputs: bad magic number");
  87
  88   /* Append the text to our internal buffer.  */
  89   fputs_unfiltered (buf, mi_console->buffer);
  90   /* Flush when an embedded newline is present anywhere in the buffer.  */
  91   if (strchr (buf, '\n') != NULL)
  92     gdb_flush (file);
  93 }
  94
  95 /* Transform a byte sequence into a console output packet.  */
  96
  97 static void
  98 mi_console_raw_packet (void *data, const char *buf, long length_buf)
  99 {
 100   struct mi_console_file *mi_console = data;
 101
 102   if (mi_console->magic != &mi_console_file_magic)
 103     internal_error (__FILE__, __LINE__,
 104                     _("mi_console_raw_packet: bad magic number"));
 105
 106   if (length_buf > 0)
 107     {
 108       fputs_unfiltered (mi_console->prefix, mi_console->raw);
 109       if (mi_console->quote)
 110         {
 111           fputc_unfiltered (mi_console->quote, mi_console->raw);
 112           fputstrn_unfiltered (buf, length_buf,
 113                                mi_console->quote, mi_console->raw);
 114           fputc_unfiltered (mi_console->quote, mi_console->raw);
 115           fputc_unfiltered ('\n', mi_console->raw);
 116         }
 117       else
 118         {
 119           fputstrn_unfiltered (buf, length_buf, 0, mi_console->raw);
 120           fputc_unfiltered ('\n', mi_console->raw);
 121         }
 122       gdb_flush (mi_console->raw);
 123     }
 124 }
 125
 126 static void
 127 mi_console_file_flush (struct ui_file *file)
 128 {
 129   struct mi_console_file *mi_console = ui_file_data (file);
 130
 131   if (mi_console->magic != &mi_console_file_magic)
 132     internal_error (__FILE__, __LINE__,
 133                     _("mi_console_file_flush: bad magic number"));
 134
 135   ui_file_put (mi_console->buffer, mi_console_raw_packet, mi_console);
 136   ui_file_rewind (mi_console->buffer);
 137
 138 }
 139
 140 /* Change the underlying stream of the console directly; this is
 141    useful as a minimum-impact way to reflect external changes like
 142    logging enable/disable.  */
 143
 144 void
 145 mi_console_set_raw (struct ui_file *file, struct ui_file *raw)
 146 {
 147   struct mi_console_file *mi_console = ui_file_data (file);
 148
 149   if (mi_console->magic != &mi_console_file_magic)
 150     internal_error (__FILE__, __LINE__,
 151                     _("mi_console_file_set_raw: bad magic number"));
 152
 153   mi_console->raw = raw;
 154 }