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import sys
try:
import ffi
except ImportError:
print("SKIP")
sys.exit()
def ffi_open(names):
err = None
for n in names:
try:
mod = ffi.open(n)
return mod
except OSError as e:
err = e
raise err
libc = ffi_open(('libc.so', 'libc.so.0', 'libc.so.6', 'libc.dylib'))
qsort = libc.func("v", "qsort", "piip")
def cmp(pa, pb):
a = ffi.as_bytearray(pa, 1)
b = ffi.as_bytearray(pb, 1)
#print("cmp:", a, b)
return a[0] - b[0]
cmp_c = ffi.callback("i", cmp, "pp")
s = bytearray(b"foobar")
print("org string:", s)
qsort(s, len(s), 1, cmp_c)
print("qsort'ed:", s)
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