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import sys
from pypy.module.cpyext.api import cts
from rpython.rlib.rstring import StringBuilder
@cts.decl("PyObject * _Py_strhex(const char* argbuf, const Py_ssize_t arglen)")
def _Py_strhex(space, argbuf, arglen):
s = strhex(argbuf, arglen)
return space.newutf8(s, len(s)) # contains ascii only
@cts.decl("PyObject * _Py_strhex_bytes(const char* argbuf, const Py_ssize_t arglen)")
def _Py_strhex_bytes(space, argbuf, arglen):
s = strhex(argbuf, arglen)
return space.newbytes(s)
hexdigits = "0123456789abcdef"
def strhex(argbuf, arglen):
assert arglen >= 0
if arglen > sys.maxint / 2:
raise MemoryError
builder = StringBuilder(arglen * 2)
for i in range(arglen):
b = ord(argbuf[i])
builder.append(hexdigits[(b >> 4) & 0xf])
builder.append(hexdigits[b & 0xf])
return builder.build()
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