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"""
String and data utils
"""
import sys
import os
import platform
try:
from charset_normalizer import from_bytes
except ImportError:
from_bytes = None
IOENCODING = os.environ.get('PYEPICS_ENCODING',
os.environ.get('PYTHONIOENCODING',
'utf-8'))
def str2bytes(st1):
'string to byte conversion'
if isinstance(st1, bytes):
return st1
return bytes(st1, IOENCODING)
def bytes2str(st1):
'byte to string conversion'
if isinstance(st1, str):
return st1
elif isinstance(st1, bytes):
try:
return str(st1, IOENCODING)
except UnicodeDecodeError:
if from_bytes is None:
raise
return str(from_bytes(st1).best())
else:
return str(st1)
def strjoin(sep, seq):
"join string sequence with a separator"
if isinstance(sep, bytes):
sep = bytes2str(sep)
if len(seq) == 0:
seq = ''
elif isinstance(seq[0], bytes):
tmp =[]
for i in seq:
if i == b'\x00':
break
tmp.append(bytes2str(i))
seq = tmp
return sep.join(seq)
def clib_search_path(lib):
'''Assemble path to c library.
Parameters
----------
lib : str
Either 'ca' or 'Com'.
Returns
--------
str : string
Examples
--------
>>> clib_search_path('ca')
'linux64/libca.so'
'''
# determine which libca / libCom dll is appropriate
try:
nbits = platform.architecture()[0]
mach = platform.machine()
except:
nbits = '32bit'
mach = 'x86_64'
nbits = nbits.replace('bit', '')
if mach.startswith('arm'):
nbits = 'arm'
libfmt = 'lib%s.so'
if os.name == 'nt':
libsrc = 'win'
libfmt = '%s.dll'
elif sys.platform == 'darwin':
libsrc = 'darwin'
if platform.machine() == 'arm64':
libsrc, nbits = 'darwinarm', '64'
libfmt = 'lib%s.dylib'
elif sys.platform.startswith('linux'):
libsrc = 'linux'
else:
return None
return os.path.join("%s%s" % (libsrc, nbits), libfmt % lib)
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