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libdiffpy/src/diffpy/runtimepath.cpp at develop · cfarrow/libdiffpy · GitHub
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runtimepath.cpp
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/*
****************************************************************************
*
* diffpy.srreal Complex Modeling Initiative
* Pavol Juhas
* (c) 2013 Brookhaven National Laboratory,
* Upton, New York. All rights reserved.
*
* File coded by: Pavol Juhas
*
* See AUTHORS.txt for a list of people who contributed.
* See LICENSE.txt for license information.
*
******************************************************************************
*
* Functions for resolving paths to static data files at runtime.
*
****************************************************************************
*/
#
include
<
cstdlib
>
#
include
<
climits
>
#
include
<
cstring
>
#
include
<
cassert
>
#
include
<
sstream
>
#
include
<
stdexcept
>
#
include
<
sys/stat.h
>
#
include
<
dlfcn.h
>
#
include
<
libgen.h
>
#
include
<
diffpy/version.hpp
>
#
include
<
diffpy/runtimepath.hpp
>
#
define
STRINGIFY
(
m
)
STRINGIFY_BRAIN_DAMAGE
(m)
#
define
STRINGIFY_BRAIN_DAMAGE
(
m
) #m
using
namespace
std
;
//
Helper Functions ----------------------------------------------------------
namespace
{
const
char
* runtimerelpath =
#
ifdef
DIFFPYRUNTIMERELPATH
STRINGIFY
(
DIFFPYRUNTIMERELPATH
)
#
else
"
../share/diffpy/libdiffpy
"
STRINGIFY
(
DIFFPY_VERSION_MAJOR
)
STRINGIFY(
DIFFPY_VERSION_MINOR
)
#
endif
;
bool
isdir
(
const
string& d)
{
struct
stat
sd;
return
(
stat
(d.
c_str
(), &sd) ==
0
&&
S_ISDIR
(sd.
st_mode
));
}
//
/ throw runtime error if directory does not exist.
void
ensureIsDir
(
const
std::string& d)
{
if
(
isdir
(d))
return
;
string
emsg
(
"
Directory '@D' does not exist.
"
);
emsg = emsg.
replace
(emsg.
find_first_of
(
'
@
'
),
2
, d);
throw
runtime_error
(emsg);
}
const
string&
diffpyruntime
()
{
char
fpb[
PATH_MAX
];
static
string librt;
static
bool
did_librt =
false
;
static
string envrt;
static
bool
did_envrt =
false
;
//
check the DIFFPYRUNTIME environment variable.
char
* pe =
getenv
(
"
DIFFPYRUNTIME
"
);
if
(pe && *pe !=
'
\0
'
)
{
static
string dprt;
did_envrt = did_envrt && (dprt == pe);
if
(!did_envrt)
{
dprt = pe;
envrt = pe;
size_t
pt = envrt.
find_last_not_of
(
'
/
'
);
if
(pt == string::npos) envrt = envrt.
substr
(
0
,
1
);
else
envrt.
erase
(pt +
1
);
ensureIsDir
(envrt);
envrt =
realpath
(envrt.
c_str
(), fpb);
did_envrt =
true
;
}
return
envrt;
}
if
(did_librt)
return
librt;
//
here we need to resolve path of the libdiffpy shared library
Dl_info i;
dladdr
(
reinterpret_cast
<
void
*>(diffpyruntime), &i);
//
first candidate is resolved in relative data path
strncpy
(fpb, i.
dli_fname
,
PATH_MAX
);
string d1 =
string
(
dirname
(fpb)) +
"
/
"
+ runtimerelpath;
if
(
isdir
(d1))
{
librt =
realpath
(d1.
c_str
(), fpb);
did_librt =
true
;
return
librt;
}
//
second candidate is resolved with respect to physical libary location
//
according to the source tree layout
string d2 =
dirname
(
realpath
(i.
dli_fname
, fpb));
d2 +=
"
/../../src/runtime
"
;
if
(
isdir
(d2))
{
librt =
realpath
(d2.
c_str
(), fpb);
did_librt =
true
;
return
librt;
}
//
nothing worked - throw exception about the first candidate path.
ensureIsDir
(d1);
return
librt;
}
}
//
namespace
//
Implementation ------------------------------------------------------------
namespace
diffpy
{
namespace
runtimepath
{
string
datapath
(
const
std::string& f)
{
string rv =
diffpyruntime
();
rv += (f.
empty
() ?
"
"
:
"
/
"
) + f;
return
rv;
}
//
class LineReader ----------------------------------------------------------
//
Constructor
LineReader::LineReader
() :
lineno
(
0
),
commentmark
(
"
#
"
)
{ }
//
Methods
bool
LineReader::isignored
()
const
{
return
words.
empty
() ||
this
->
iscomment
();
}
bool
LineReader::iscomment
()
const
{
bool
rv = !commentmark.
empty
() && !words.
empty
() &&
(
0
== words[
0
].
compare
(
0
, commentmark.
size
(), commentmark));
return
rv;
}
bool
LineReader::isblank
()
const
{
return
words.
empty
();
}
size_t
LineReader::wcount
()
const
{
return
words.
size
();
}
runtime_error
LineReader::format_error
(
const
string& filename, string edetail)
{
ostringstream emsg;
emsg <<
"
Invalid data format in
"
<<
filename <<
"
line
"
<<
this
->
lineno
<<
'
.
'
;
if
(!edetail.
empty
()) emsg <<
'
\n
'
<< edetail;
return
runtime_error
(emsg.
str
());
}
//
Non-member operators
istream&
operator
>> (istream& fp, LineReader& line)
{
getline
(fp, line.
line
);
line.
lineno
++;
istringstream
fpline
(line.
line
);
line.
words
.
clear
();
string w;
if
(line.
separator
.
empty
()) {
while
(fpline >> w) line.
words
.
push_back
(w);
}
else
{
assert
(line.
separator
.
size
() ==
1
);
const
char
& sep = line.
separator
[
0
];
while
(
getline
(fpline, w, sep)) line.
words
.
push_back
(w);
}
return
fp;
}
}
//
namespace runtimepath
}
//
namespace diffpy
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