gdbsupport/format.h

   1 /* Parse a printf-style format string.
   2
   3    Copyright (C) 1986-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef COMMON_FORMAT_H
  21 #define COMMON_FORMAT_H
  22
  23 #include "gdbsupport/gdb_string_view.h"
  24
  25 #if defined(__MINGW32__) && !defined(PRINTF_HAS_LONG_LONG)
  26 # define USE_PRINTF_I64 1
  27 # define PRINTF_HAS_LONG_LONG
  28 #else
  29 # define USE_PRINTF_I64 0
  30 #endif
  31
  32 /* The argclass represents the general type of data that goes with a
  33    format directive; int_arg for %d, long_arg for %l, and so forth.
  34    Note that these primarily distinguish types by size and need for
  35    special handling, so for instance %u and %x are (at present) also
  36    classed as int_arg.  */
  37
  38 enum argclass
  39   {
  40     literal_piece,
  41     int_arg, long_arg, long_long_arg, size_t_arg, ptr_arg,
  42     string_arg, wide_string_arg, wide_char_arg,
  43     double_arg, long_double_arg,
  44     dec32float_arg, dec64float_arg, dec128float_arg
  45   };
  46
  47 /* A format piece is a section of the format string that may include a
  48    single print directive somewhere in it, and the associated class
  49    for the argument.  */
  50
  51 struct format_piece
  52 {
  53   format_piece (const char *str, enum argclass argc, int n)
  54     : string (str),
  55       argclass (argc),
  56       n_int_args (n)
  57   {
  58   }
  59
  60   bool operator== (const format_piece &other) const
  61   {
  62     return (this->argclass == other.argclass
  63             && gdb::string_view (this->string) == other.string);
  64   }
  65
  66   const char *string;
  67   enum argclass argclass;
  68   /* Count the number of preceding 'int' arguments that must be passed
  69      along.  This is used for a width or precision of '*'.  Note that
  70      this feature is only available in "gdb_extensions" mode.  */
  71   int n_int_args;
  72 };
  73
  74 class format_pieces
  75 {
  76 public:
  77
  78   format_pieces (const char **arg, bool gdb_extensions = false);
  79   ~format_pieces () = default;
  80
  81   DISABLE_COPY_AND_ASSIGN (format_pieces);
  82
  83   typedef std::vector<format_piece>::iterator iterator;
  84
  85   iterator begin ()
  86   {
  87     return m_pieces.begin ();
  88   }
  89
  90   iterator end ()
  91   {
  92     return m_pieces.end ();
  93   }
  94
  95 private:
  96
  97   std::vector<format_piece> m_pieces;
  98   gdb::unique_xmalloc_ptr<char> m_storage;
  99 };
 100
 101 #endif /* COMMON_FORMAT_H */