gdb/common/gdb_tilde_expand.c

   1 /* Perform tilde expansion on paths for GDB and gdbserver.
   2
   3    Copyright (C) 2017-2019 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 #include "common-defs.h"
  21 #include "gdb_tilde_expand.h"
  22 #include <glob.h>
  23
  24 /* RAII-style class wrapping "glob".  */
  25
  26 class gdb_glob
  27 {
  28 public:
  29   /* Construct a "gdb_glob" object by calling "glob" with the provided
  30      parameters.  This function can throw if "glob" fails.  */
  31   gdb_glob (const char *pattern, int flags,
  32             int (*errfunc) (const char *epath, int eerrno))
  33   {
  34     int ret = glob (pattern, flags, errfunc, &m_glob);
  35
  36     if (ret != 0)
  37       {
  38         if (ret == GLOB_NOMATCH)
  39           error (_("Could not find a match for '%s'."), pattern);
  40         else
  41           error (_("glob could not process pattern '%s'."),
  42                  pattern);
  43       }
  44   }
  45
  46   /* Destroy the object and free M_GLOB.  */
  47   ~gdb_glob ()
  48   {
  49     globfree (&m_glob);
  50   }
  51
  52   /* Return the GL_PATHC component of M_GLOB.  */
  53   int pathc () const
  54   {
  55     return m_glob.gl_pathc;
  56   }
  57
  58   /* Return the GL_PATHV component of M_GLOB.  */
  59   char **pathv () const
  60   {
  61     return m_glob.gl_pathv;
  62   }
  63
  64 private:
  65   /* The actual glob object we're dealing with.  */
  66   glob_t m_glob;
  67 };
  68
  69 /* See common/gdb_tilde_expand.h.  */
  70
  71 std::string
  72 gdb_tilde_expand (const char *dir)
  73 {
  74   gdb_glob glob (dir, GLOB_TILDE_CHECK, NULL);
  75
  76   gdb_assert (glob.pathc () > 0);
  77   /* "glob" may return more than one match to the path provided by the
  78      user, but we are only interested in the first match.  */
  79   std::string expanded_dir = glob.pathv ()[0];
  80
  81   return expanded_dir;
  82 }
  83
  84 /* See common/gdb_tilde_expand.h.  */
  85
  86 gdb::unique_xmalloc_ptr<char>
  87 gdb_tilde_expand_up (const char *dir)
  88 {
  89   gdb_glob glob (dir, GLOB_TILDE_CHECK, NULL);
  90
  91   gdb_assert (glob.pathc () > 0);
  92   /* "glob" may return more than one match to the path provided by the
  93      user, but we are only interested in the first match.  */
  94   return gdb::unique_xmalloc_ptr<char> (xstrdup (glob.pathv ()[0]));
  95 }