gdb/ui-file.h

   1 /* UI_FILE - a generic STDIO like output stream.
   2    Copyright (C) 1999-2016 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef UI_FILE_H
  20 #define UI_FILE_H
  21
  22 struct obstack;
  23 struct ui_file;
  24
  25 /* Create a generic ui_file object with null methods.  */
  26
  27 extern struct ui_file *ui_file_new (void);
  28
  29 /* Override methods used by specific implementations of a UI_FILE
  30    object.  */
  31
  32 typedef void (ui_file_flush_ftype) (struct ui_file *stream);
  33 extern void set_ui_file_flush (struct ui_file *stream,
  34                                ui_file_flush_ftype *flush);
  35
  36 /* NOTE: Both fputs and write methods are available.  Default
  37    implementations that mapping one onto the other are included.  */
  38 typedef void (ui_file_write_ftype) (struct ui_file *stream,
  39                                     const char *buf, long length_buf);
  40 extern void set_ui_file_write (struct ui_file *stream,
  41                                ui_file_write_ftype *fputs);
  42
  43 typedef void (ui_file_fputs_ftype) (const char *, struct ui_file *stream);
  44 extern void set_ui_file_fputs (struct ui_file *stream,
  45                                ui_file_fputs_ftype *fputs);
  46
  47 /* This version of "write" is safe for use in signal handlers.
  48    It's not guaranteed that all existing output will have been
  49    flushed first.
  50    Implementations are also free to ignore some or all of the request.
  51    fputs_async is not provided as the async versions are rarely used,
  52    no point in having both for a rarely used interface.  */
  53 typedef void (ui_file_write_async_safe_ftype)
  54   (struct ui_file *stream, const char *buf, long length_buf);
  55 extern void set_ui_file_write_async_safe
  56   (struct ui_file *stream, ui_file_write_async_safe_ftype *write_async_safe);
  57
  58 typedef long (ui_file_read_ftype) (struct ui_file *stream,
  59                                    char *buf, long length_buf);
  60 extern void set_ui_file_read (struct ui_file *stream,
  61                               ui_file_read_ftype *fread);
  62
  63 typedef int (ui_file_isatty_ftype) (struct ui_file *stream);
  64 extern void set_ui_file_isatty (struct ui_file *stream,
  65                                 ui_file_isatty_ftype *isatty);
  66
  67 typedef void (ui_file_rewind_ftype) (struct ui_file *stream);
  68 extern void set_ui_file_rewind (struct ui_file *stream,
  69                                 ui_file_rewind_ftype *rewind);
  70
  71 typedef void (ui_file_put_method_ftype) (void *object, const char *buffer,
  72                                          long length_buffer);
  73 typedef void (ui_file_put_ftype) (struct ui_file *stream,
  74                                   ui_file_put_method_ftype *method,
  75                                   void *context);
  76 extern void set_ui_file_put (struct ui_file *stream, ui_file_put_ftype *put);
  77
  78 typedef void (ui_file_delete_ftype) (struct ui_file * stream);
  79 extern void set_ui_file_data (struct ui_file *stream, void *data,
  80                               ui_file_delete_ftype *to_delete);
  81
  82 typedef int (ui_file_fseek_ftype) (struct ui_file *stream, long offset,
  83                                    int whence);
  84 extern void set_ui_file_fseek (struct ui_file *stream,
  85                                ui_file_fseek_ftype *fseek_ptr);
  86
  87 extern void *ui_file_data (struct ui_file *file);
  88
  89
  90 extern void gdb_flush (struct ui_file *);
  91
  92 extern void ui_file_delete (struct ui_file *stream);
  93
  94 extern void ui_file_rewind (struct ui_file *stream);
  95
  96 extern int ui_file_isatty (struct ui_file *);
  97
  98 extern void ui_file_write (struct ui_file *file, const char *buf,
  99                            long length_buf);
 100
 101 /* A wrapper for ui_file_write that is suitable for use by
 102    ui_file_put.  */
 103
 104 extern void ui_file_write_for_put (void *data, const char *buffer,
 105                                    long length_buffer);
 106
 107 extern void ui_file_write_async_safe (struct ui_file *file, const char *buf,
 108                                       long length_buf);
 109
 110 /* NOTE: copies left to right.  */
 111 extern void ui_file_put (struct ui_file *src,
 112                          ui_file_put_method_ftype *write, void *dest);
 113
 114 /* Returns a freshly allocated buffer containing the entire contents
 115    of FILE (as determined by ui_file_put()) with a NUL character
 116    appended.  LENGTH, if not NULL, is set to the size of the buffer
 117    minus that appended NUL.  */
 118 extern char *ui_file_xstrdup (struct ui_file *file, long *length);
 119
 120 /* Similar to ui_file_xstrdup, but return a new string allocated on
 121    OBSTACK.  */
 122 extern char *ui_file_obsavestring (struct ui_file *file,
 123                                    struct obstack *obstack, long *length);
 124
 125 extern long ui_file_read (struct ui_file *file, char *buf, long length_buf);
 126
 127 extern int ui_file_fseek (struct ui_file *file, long offset, int whence);
 128
 129 /* Create/open a memory based file.  Can be used as a scratch buffer
 130    for collecting output.  */
 131 extern struct ui_file *mem_fileopen (void);
 132
 133
 134
 135 /* Open/create a STDIO based UI_FILE using the already open FILE.  */
 136 extern struct ui_file *stdio_fileopen (FILE *file);
 137
 138 /* Create a ui_file from stderr.  */
 139 extern struct ui_file *stderr_fileopen (void);
 140
 141
 142 /* Open NAME returning an STDIO based UI_FILE.  */
 143 extern struct ui_file *gdb_fopen (const char *name, const char *mode);
 144
 145 /* Create a file which writes to both ONE and TWO.  CLOSE_ONE
 146    and CLOSE_TWO indicate whether the original files should be
 147    closed when the new file is closed.  */
 148 extern struct ui_file *tee_file_new (struct ui_file *one,
 149                                      int close_one,
 150                                      struct ui_file *two,
 151                                      int close_two);
 152 #endif