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"""
python support for XPA client access
"""
import os
import platform
import sys
import ctypes
import ctypes.util
# look for the shared library in sys.path
def _find_shlib(_libbase):
_ulist=platform.uname()
if _ulist[0] == 'Darwin':
_libname = 'lib' + _libbase + '.dylib'
elif _ulist[0] == 'Windows':
_libname = 'libxpa.dll'
else:
_libname = 'lib' + _libbase + '.so'
for _dir in sys.path:
_fname = os.path.join(_dir, _libname)
if os.path.exists(_fname):
return _fname
# try current directory
_fname = os.path.join('./xpa-2.1.15', _libname)
if os.path.exists(_fname):
return _fname
return None
_libpath='libxpa.so.1'
if _libpath:
libxpa=ctypes.cdll.LoadLibrary(_libpath)
_ulist=platform.uname()
if _ulist[0] == 'Windows':
libc=ctypes.cdll.msvcrt
else:
libc=ctypes.cdll.LoadLibrary(None)
else:
raise ImportError, "can't find XPA shared library"
# factory routine returning pointer to byte array
c_byte_p = ctypes.POINTER(ctypes.c_byte)
# free C buffers returned by xpa calls
def _freebufs(p_arr, len):
for i in range(len):
if p_arr[i]:
libc.free(p_arr[i])
## XPA XPAOpen(char *mode);
libxpa.XPAOpen.restype = ctypes.c_void_p
libxpa.XPAOpen.argtypes = [ctypes.c_char_p]
def XPAOpen(mode):
return libxpa.XPAOpen(mode)
## void XPAClose(XPA xpa);
libxpa.XPAClose.argtypes = [ctypes.c_void_p]
def XPAClose(xpa):
libxpa.XPAClose(xpa)
## int XPAGet(XPA xpa, char *template, char *paramlist, char *mode,
## char **bufs, int *lens, char **names, char **messages, int n);
libxpa.XPAGet.restype = ctypes.c_int
def XPAGet(xpa, target, paramlist, mode, bufs, lens, names, messages, n):
libxpa.XPAGet.argtypes = [ctypes.c_void_p, ctypes.c_char_p, \
ctypes.c_char_p, ctypes.c_char_p, \
c_byte_p*n, ctypes.c_int*n, \
c_byte_p*n, c_byte_p*n, \
ctypes.c_int]
return libxpa.XPAGet(xpa, target, paramlist, mode, \
bufs, lens, names, messages, n)
## int XPASet(XPA xpa,
## char *template, char *paramlist, char *mode,
## char *buf, int len, char **names, char **messages,
## int n);
XPASet = libxpa.XPASet
libxpa.XPASet.restype = ctypes.c_int
def XPASet(xpa, target, paramlist, mode, buf, blen, names, messages, n):
libxpa.XPASet.argtypes = [ctypes.c_void_p, ctypes.c_char_p, \
ctypes.c_char_p, ctypes.c_char_p, \
ctypes.c_char_p, ctypes.c_int, \
c_byte_p*n, c_byte_p*n, \
ctypes.c_int]
return libxpa.XPASet(xpa, target, paramlist, mode, \
buf, blen, names, messages, n)
## int XPAInfo(XPA xpa,
## char *template, char *paramlist, char *mode,
## char **names, char **messages, int n);
XPAInfo = libxpa.XPAInfo
libxpa.XPAInfo.restype = ctypes.c_int
def XPAInfo(xpa, target, paramlist, mode, names, messages, n):
libxpa.XPAInfo.argtypes = [ctypes.c_void_p, ctypes.c_char_p, \
ctypes.c_char_p, ctypes.c_char_p, \
c_byte_p*n, c_byte_p*n, \
ctypes.c_int]
return libxpa.XPAInfo(xpa, target, paramlist, mode, names, messages, n)
## int XPAAccess(XPA xpa,
## char *template, char *paramlist, char *mode,
## char **names, char **messages, int n);
libxpa.XPAAccess.restype = ctypes.c_int
def XPAAccess(xpa, target, paramlist, mode, names, messages, n):
libxpa.XPAAccess.argtypes = [ctypes.c_void_p, ctypes.c_char_p, \
ctypes.c_char_p, ctypes.c_char_p, \
c_byte_p*n, c_byte_p*n, \
ctypes.c_int]
return libxpa.XPAAccess(xpa, target, paramlist, mode, \
names, messages, n)
# default value for n (max number of access points)
xpa_n = 1024
def xpaget(target, plist=None, n=xpa_n):
buf_t = c_byte_p*n
bufs = buf_t()
names = buf_t()
errs = buf_t()
int_t = ctypes.c_int*n
lens = int_t()
errmsg = ''
got = XPAGet(None, target, plist, None, bufs, lens, names, errs, n)
if got:
buf = []
for i in range(got):
if lens[i]:
cur=ctypes.string_at(bufs[i], lens[i])
buf.append(cur)
for i in range(got):
if errs[i]: errmsg += ctypes.string_at(errs[i]).strip() + '\n'
else:
buf = None
_freebufs(bufs, n)
_freebufs(names, n)
_freebufs(errs, n)
if errmsg: raise ValueError, errmsg
return buf
def xpaset(target, plist=None, buf=None, blen=-1, n=xpa_n):
if blen < 0:
if buf != None:
blen = len(buf)
else:
blen = 0
buf_t = c_byte_p*n
names = buf_t()
errs = buf_t()
errmsg = ''
got = XPASet(None, target, plist, None, buf, blen, names, errs, n)
for i in range(got):
if errs[i]: errmsg += ctypes.string_at(errs[i]).strip() + '\n'
_freebufs(names, n)
_freebufs(errs, n)
if errmsg: raise ValueError, errmsg
return got
def xpainfo(target, plist=None, n=xpa_n):
buf_t = c_byte_p*n
names = buf_t()
errs = buf_t()
errmsg = ''
got = XPAInfo(None, target, plist, None, names, errs, n)
for i in range(got):
if errs[i]: errmsg += ctypes.string_at(errs[i]).strip() + '\n'
_freebufs(names, n)
_freebufs(errs, n)
if errmsg: raise ValueError, errmsg
return got
def xpaaccess(target, plist=None, n=xpa_n):
buf_t = c_byte_p*n
names = buf_t()
errs = buf_t()
errmsg = ''
got = XPAAccess(None, target, plist, None, names, errs, n)
if got:
buf = []
for i in range(got):
if names[i]:
cur = ctypes.string_at(names[i]).strip()
buf.append(cur)
for i in range(got):
if errs[i]: errmsg += ctypes.string_at(errs[i]).strip() + '\n'
else:
buf = None
_freebufs(names, n)
_freebufs(errs, n)
if errmsg: raise ValueError, errmsg
return buf
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