python类h()的实例源码

def test_Wconversion_floating():
    lib = _Wconversion("float sin(double);",
                       "#include <math.h>", libraries=lib_m)
    res = lib.sin(1.23)
    assert res != math.sin(1.23)     # not exact, because of double->float
    assert abs(res - math.sin(1.23)) < 1E-5

def test_Wconversion_float2int():
    _Wconversion("int sinf(float);",
                 "#include <math.h>", libraries=lib_m)

def test_Wconversion_double2int():
    _Wconversion("int sin(double);",
                 "#include <math.h>", libraries=lib_m)

def test_rounding_1():
    ffi = FFI()
    ffi.cdef("double sinf(float x);")
    lib = ffi.verify('#include <math.h>', libraries=lib_m)
    res = lib.sinf(1.23)
    assert res != math.sin(1.23)     # not exact, because of double->float
    assert abs(res - math.sin(1.23)) < 1E-5

def test_rounding_2():
    ffi = FFI()
    ffi.cdef("double sin(float x);")
    lib = ffi.verify('#include <math.h>', libraries=lib_m)
    res = lib.sin(1.23)
    assert res != math.sin(1.23)     # not exact, because of double->float
    assert abs(res - math.sin(1.23)) < 1E-5

def test_strlen_approximate():
    lib = _Wconversion("int strlen(char *s);",
                       "#include <string.h>")
    assert lib.strlen(b"hi there!") == 9

def test_strlen_array_of_char():
    ffi = FFI()
    ffi.cdef("size_t strlen(char[]);")
    lib = ffi.verify("#include <string.h>")
    assert lib.strlen(b"hello") == 5

def test_longdouble():
    ffi = FFI()
    ffi.cdef("long double sinl(long double x);")
    lib = ffi.verify('#include <math.h>', libraries=lib_m)
    for input in [1.23,
                  ffi.cast("double", 1.23),
                  ffi.cast("long double", 1.23)]:
        x = lib.sinl(input)
        assert repr(x).startswith("<cdata 'long double'")
        assert (float(x) - math.sin(1.23)) < 1E-10

def test_funcptr_as_argument():
    ffi = FFI()
    ffi.cdef("""
        void qsort(void *base, size_t nel, size_t width,
            int (*compar)(const void *, const void *));
    """)
    ffi.verify("#include <stdlib.h>")

def test_func_as_argument():
    ffi = FFI()
    ffi.cdef("""
        void qsort(void *base, size_t nel, size_t width,
            int compar(const void *, const void *));
    """)
    ffi.verify("#include <stdlib.h>")

def test_function_typedef():
    ffi = FFI()
    ffi.cdef("""
        typedef double func_t(double);
        func_t sin;
    """)
    lib = ffi.verify('#include <math.h>', libraries=lib_m)
    assert lib.sin(1.23) == math.sin(1.23)

def test_return_partial_struct():
    ffi = FFI()
    ffi.cdef("""
        typedef struct { int x; ...; } foo_t;
        foo_t foo(void);
    """)
    lib = ffi.verify("""
        typedef struct { int y, x; } foo_t;
        foo_t foo(void) { foo_t r = { 45, 81 }; return r; }
    """)
    h = lib.foo()
    assert ffi.sizeof(h) == 2 * ffi.sizeof("int")
    assert h.x == 81

def test_relative_to():
    import tempfile, os
    from testing.udir import udir
    tmpdir = tempfile.mkdtemp(dir=str(udir))
    ffi = FFI()
    ffi.cdef("int foo(int);")
    f = open(os.path.join(tmpdir, 'foo.h'), 'w')
    f.write("int foo(int a) { return a + 42; }\n")
    f.close()
    lib = ffi.verify('#include "foo.h"',
                     include_dirs=['.'],
                     relative_to=os.path.join(tmpdir, 'x'))
    assert lib.foo(100) == 142

def test_string_to_voidp_arg():
    ffi = FFI()
    ffi.cdef("int myfunc(void *);")
    lib = ffi.verify("int myfunc(void *p) { return ((signed char *)p)[0]; }")
    res = lib.myfunc(b"hi!")
    assert res == ord(b"h")
    p = ffi.new("char[]", b"gah")
    res = lib.myfunc(p)
    assert res == ord(b"g")
    res = lib.myfunc(ffi.cast("void *", p))
    assert res == ord(b"g")
    res = lib.myfunc(ffi.cast("int *", p))
    assert res == ord(b"g")

def test_write_source(self):
        ffi = FFI()
        ffi.cdef("double sin(double x);")
        csrc = '/*hi there %s!*/\n#include <math.h>\n' % self
        v = Verifier(ffi, csrc, force_generic_engine=self.generic,
                     libraries=[self.lib_m])
        v.write_source()
        with open(v.sourcefilename, 'r') as f:
            data = f.read()
        assert csrc in data

def test_write_source_explicit_filename(self):
        ffi = FFI()
        ffi.cdef("double sin(double x);")
        csrc = '/*hi there %s!*/\n#include <math.h>\n' % self
        v = Verifier(ffi, csrc, force_generic_engine=self.generic,
                     libraries=[self.lib_m])
        v.sourcefilename = filename = str(udir.join('write_source.c'))
        v.write_source()
        assert filename == v.sourcefilename
        with open(filename, 'r') as f:
            data = f.read()
        assert csrc in data

def test_write_source_to_file_obj(self):
        ffi = FFI()
        ffi.cdef("double sin(double x);")
        csrc = '/*hi there %s!*/\n#include <math.h>\n' % self
        v = Verifier(ffi, csrc, force_generic_engine=self.generic,
                     libraries=[self.lib_m])
        try:
            from StringIO import StringIO
        except ImportError:
            from io import StringIO
        f = StringIO()
        v.write_source(file=f)
        assert csrc in f.getvalue()

def test_compile_module(self):
        ffi = FFI()
        ffi.cdef("double sin(double x);")
        csrc = '/*hi there %s!*/\n#include <math.h>\n' % self
        v = Verifier(ffi, csrc, force_generic_engine=self.generic,
                     libraries=[self.lib_m])
        v.compile_module()
        assert v.get_module_name().startswith('_cffi_')
        if v.generates_python_module():
            mod = imp.load_dynamic(v.get_module_name(), v.modulefilename)
            assert hasattr(mod, '_cffi_setup')

def test_compile_module_explicit_filename(self):
        ffi = FFI()
        ffi.cdef("double sin(double x);")
        csrc = '/*hi there %s!2*/\n#include <math.h>\n' % self
        v = Verifier(ffi, csrc, force_generic_engine=self.generic,
                     libraries=[self.lib_m])
        basename = self.__class__.__name__ + 'test_compile_module'
        v.modulefilename = filename = str(udir.join(basename + '.so'))
        v.compile_module()
        assert filename == v.modulefilename
        assert v.get_module_name() == basename
        if v.generates_python_module():
            mod = imp.load_dynamic(v.get_module_name(), v.modulefilename)
            assert hasattr(mod, '_cffi_setup')

def test_load_library(self):
        ffi = FFI()
        ffi.cdef("double sin(double x);")
        csrc = '/*hi there %s!3*/\n#include <math.h>\n' % self
        v = Verifier(ffi, csrc, force_generic_engine=self.generic,
                     libraries=[self.lib_m])
        library = v.load_library()
        assert library.sin(12.3) == math.sin(12.3)