ceph/src/boost/tools/build/src/engine/cwd.cpp

   1 /*
   2  * Copyright 2002. Vladimir Prus
   3  * Copyright 2005. Rene Rivera
   4  * Distributed under the Boost Software License, Version 1.0.
   5  * (See accompanying file LICENSE_1_0.txt or copy at
   6  * http://www.boost.org/LICENSE_1_0.txt)
   7  */
   8
   9 #include "cwd.h"
  10
  11 #include "jam.h"
  12 #include "mem.h"
  13 #include "pathsys.h"
  14
  15 #include <assert.h>
  16 #include <errno.h>
  17 #include <limits.h>
  18
  19 /* MinGW on Windows declares PATH_MAX in limits.h */
  20 #if defined( NT ) && !defined( __GNUC__ )
  21 # include <direct.h>
  22 # define PATH_MAX _MAX_PATH
  23 #else
  24 # include <unistd.h>
  25 # if defined( __COMO__ )
  26 #  include <linux/limits.h>
  27 # endif
  28 #endif
  29
  30 #ifndef PATH_MAX
  31 # define PATH_MAX 1024
  32 #endif
  33
  34
  35 static OBJECT * cwd_;
  36
  37
  38 void cwd_init( void )
  39 {
  40     int buffer_size = PATH_MAX;
  41     char * cwd_buffer = 0;
  42     int error;
  43
  44     assert( !cwd_ );
  45
  46     do
  47     {
  48         char * const buffer = (char *)BJAM_MALLOC_RAW( buffer_size );
  49 #ifdef OS_VMS
  50         /* cwd in POSIX-format */
  51         cwd_buffer = getcwd( buffer, buffer_size, 0 );
  52 #else
  53         cwd_buffer = getcwd( buffer, buffer_size );
  54 #endif
  55         error = errno;
  56         if ( cwd_buffer )
  57         {
  58             /* We store the path using its canonical/long/key format. */
  59             OBJECT * const cwd = object_new( cwd_buffer );
  60             cwd_ = path_as_key( cwd );
  61             object_free( cwd );
  62         }
  63         buffer_size *= 2;
  64         BJAM_FREE_RAW( buffer );
  65     }
  66     while ( !cwd_ && error == ERANGE );
  67
  68     if ( !cwd_ )
  69     {
  70         perror( "can not get current working directory" );
  71         exit( EXITBAD );
  72     }
  73 }
  74
  75
  76 OBJECT * cwd( void )
  77 {
  78     assert( cwd_ );
  79     return cwd_;
  80 }
  81
  82
  83 void cwd_done( void )
  84 {
  85     assert( cwd_ );
  86     object_free( cwd_ );
  87     cwd_ = NULL;
  88 }