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https://github.com/python/cpython.git
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306 lines
8.4 KiB
C
306 lines
8.4 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Math module -- standard C math library functions, pi and e */
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#include "Python.h"
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#include "mymath.h"
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#ifndef _MSC_VER
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#ifndef __STDC__
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extern double fmod Py_PROTO((double, double));
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extern double frexp Py_PROTO((double, int *));
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extern double ldexp Py_PROTO((double, int));
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extern double modf Py_PROTO((double, double *));
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#endif /* __STDC__ */
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#endif /* _MSC_VER */
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#ifdef i860
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/* Cray APP has bogus definition of HUGE_VAL in <math.h> */
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#undef HUGE_VAL
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#endif
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#ifdef HUGE_VAL
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#define CHECK(x) if (errno != 0) ; \
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else if (-HUGE_VAL <= (x) && (x) <= HUGE_VAL) ; \
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else errno = ERANGE
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#else
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#define CHECK(x) /* Don't know how to check */
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#endif
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static PyObject *
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math_error()
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{
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if (errno == EDOM)
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PyErr_SetString(PyExc_ValueError, "math domain error");
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else if (errno == ERANGE)
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PyErr_SetString(PyExc_OverflowError, "math range error");
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else
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/* Unexpected math error */
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PyErr_SetFromErrno(PyExc_ValueError);
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return NULL;
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}
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static PyObject *
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math_1(args, func)
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PyObject *args;
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double (*func) Py_FPROTO((double));
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{
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double x;
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if (! PyArg_Parse(args, "d", &x))
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return NULL;
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errno = 0;
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PyFPE_START_PROTECT("in math_1", return 0)
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x = (*func)(x);
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PyFPE_END_PROTECT(x)
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CHECK(x);
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if (errno != 0)
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return math_error();
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else
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return PyFloat_FromDouble(x);
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}
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static PyObject *
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math_2(args, func)
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PyObject *args;
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double (*func) Py_FPROTO((double, double));
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{
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double x, y;
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if (! PyArg_Parse(args, "(dd)", &x, &y))
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return NULL;
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errno = 0;
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PyFPE_START_PROTECT("in math_2", return 0)
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x = (*func)(x, y);
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PyFPE_END_PROTECT(x)
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CHECK(x);
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if (errno != 0)
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return math_error();
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else
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return PyFloat_FromDouble(x);
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}
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#define FUNC1(stubname, func, docstring_name, docstring) \
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static PyObject * stubname(self, args) PyObject *self, *args; { \
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return math_1(args, func); \
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}\
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static char docstring_name [] = docstring;
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#define FUNC2(stubname, func, docstring_name, docstring) \
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static PyObject * stubname(self, args) PyObject *self, *args; { \
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return math_2(args, func); \
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}\
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static char docstring_name [] = docstring;
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FUNC1(math_acos, acos, math_acos_doc,
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"acos(x)\n\nReturn the arc cosine of x.")
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FUNC1(math_asin, asin, math_asin_doc,
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"asin(x)\n\nReturn the arc sine of x.")
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FUNC1(math_atan, atan, math_atan_doc,
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"atan(x)\n\nReturn the arc tangent of x.")
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FUNC2(math_atan2, atan2, math_atan2_doc,
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"atan2(y, x)\n\nReturn atan(y/x).")
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FUNC1(math_ceil, ceil, math_ceil_doc,
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"ceil(x)\n\nReturn the ceiling of x as a real.")
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FUNC1(math_cos, cos, math_cos_doc,
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"cos(x)\n\nReturn the cosine of x.")
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FUNC1(math_cosh, cosh, math_cosh_doc,
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"cosh(x)\n\nReturn the hyperbolic cosine of x.")
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FUNC1(math_exp, exp, math_exp_doc,
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"exp(x)\n\nReturn e raised to the power of x.")
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FUNC1(math_fabs, fabs, math_fabs_doc,
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"fabs(x)\n\nReturn the absolute value of the real x.")
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FUNC1(math_floor, floor, math_floor_doc,
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"floor(x)\n\nReturn the floor of x as a real.")
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FUNC2(math_fmod, fmod, math_fmod_doc,
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"fmod(x,y)\n\nReturn x % y.")
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FUNC2(math_hypot, hypot, math_hypot_doc,
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"hypot(x,y)\n\nReturn the Euclidean distance, sqrt(x*x + y*y).")
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FUNC1(math_log, log, math_log_doc,
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"log(x)\n\nReturn the natural logarithm of x.")
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FUNC1(math_log10, log10, math_log10_doc,
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"log10(x)\n\nReturn the base-10 logarithm of x.")
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#ifdef MPW_3_1 /* This hack is needed for MPW 3.1 but not for 3.2 ... */
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FUNC2(math_pow, power, math_pow_doc,
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"power(x,y)\n\nReturn x**y.")
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#else
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FUNC2(math_pow, pow, math_pow_doc,
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"pow(x,y)\n\nReturn x**y.")
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#endif
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FUNC1(math_sin, sin, math_sin_doc,
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"sin(x)\n\nReturn the sine of x.")
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FUNC1(math_sinh, sinh, math_sinh_doc,
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"sinh(x)\n\nReturn the hyperbolic sine of x.")
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FUNC1(math_sqrt, sqrt, math_sqrt_doc,
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"sqrt(x)\n\nReturn the square root of x.")
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FUNC1(math_tan, tan, math_tan_doc,
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"tan(x)\n\nReturn the tangent of x.")
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FUNC1(math_tanh, tanh, math_tanh_doc,
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"tanh(x)\n\nReturn the hyperbolic tangent of x.")
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static PyObject *
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math_frexp(self, args)
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PyObject *self;
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PyObject *args;
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{
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double x;
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int i;
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if (! PyArg_Parse(args, "d", &x))
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return NULL;
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errno = 0;
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x = frexp(x, &i);
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CHECK(x);
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if (errno != 0)
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return math_error();
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return Py_BuildValue("(di)", x, i);
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}
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static char math_frexp_doc [] =
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"frexp(x)\n\
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\n\
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Return the matissa and exponent for x. The mantissa is positive.";
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static PyObject *
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math_ldexp(self, args)
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PyObject *self;
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PyObject *args;
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{
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double x, y;
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/* Cheat -- allow float as second argument */
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if (! PyArg_Parse(args, "(dd)", &x, &y))
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return NULL;
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errno = 0;
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PyFPE_START_PROTECT("ldexp", return 0)
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x = ldexp(x, (int)y);
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PyFPE_END_PROTECT(x)
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CHECK(x);
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if (errno != 0)
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return math_error();
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else
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return PyFloat_FromDouble(x);
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}
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static char math_ldexp_doc [] =
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"ldexp_doc(x, i)\n\
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\n\
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Return x * (2**i).";
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static PyObject *
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math_modf(self, args)
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PyObject *self;
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PyObject *args;
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{
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double x, y;
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if (! PyArg_Parse(args, "d", &x))
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return NULL;
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errno = 0;
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#ifdef MPW /* MPW C modf expects pointer to extended as second argument */
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{
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extended e;
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x = modf(x, &e);
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y = e;
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}
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#else
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x = modf(x, &y);
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#endif
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CHECK(x);
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if (errno != 0)
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return math_error();
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return Py_BuildValue("(dd)", x, y);
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}
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static char math_modf_doc [] =
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"modf(x)\n\
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\n\
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Return the fractional and integer parts of x. Both results carry the sign\n\
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of x. The integer part is returned as a real.";
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static PyMethodDef math_methods[] = {
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{"acos", math_acos, 0, math_acos_doc},
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{"asin", math_asin, 0, math_asin_doc},
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{"atan", math_atan, 0, math_atan_doc},
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{"atan2", math_atan2, 0, math_atan2_doc},
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{"ceil", math_ceil, 0, math_ceil_doc},
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{"cos", math_cos, 0, math_cos_doc},
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{"cosh", math_cosh, 0, math_cosh_doc},
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{"exp", math_exp, 0, math_exp_doc},
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{"fabs", math_fabs, 0, math_fabs_doc},
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{"floor", math_floor, 0, math_floor_doc},
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{"fmod", math_fmod, 0, math_fmod_doc},
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{"frexp", math_frexp, 0, math_frexp_doc},
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{"hypot", math_hypot, 0, math_hypot_doc},
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{"ldexp", math_ldexp, 0, math_ldexp_doc},
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{"log", math_log, 0, math_log_doc},
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{"log10", math_log10, 0, math_log10_doc},
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{"modf", math_modf, 0, math_modf_doc},
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{"pow", math_pow, 0, math_pow_doc},
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{"sin", math_sin, 0, math_sin_doc},
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{"sinh", math_sinh, 0, math_sinh_doc},
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{"sqrt", math_sqrt, 0, math_sqrt_doc},
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{"tan", math_tan, 0, math_tan_doc},
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{"tanh", math_tanh, 0, math_tanh_doc},
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{NULL, NULL} /* sentinel */
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};
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static char module_doc [] =
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"This module is always available. It provides access to the\n\
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mathematical functions defined by the C standard.";
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DL_EXPORT(void)
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initmath()
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{
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PyObject *m, *d, *v;
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m = Py_InitModule3("math", math_methods, module_doc);
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d = PyModule_GetDict(m);
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if (!(v = PyFloat_FromDouble(atan(1.0) * 4.0)))
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goto finally;
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if (PyDict_SetItemString(d, "pi", v) < 0)
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goto finally;
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Py_DECREF(v);
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if (!(v = PyFloat_FromDouble(exp(1.0))))
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goto finally;
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if (PyDict_SetItemString(d, "e", v) < 0)
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goto finally;
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Py_DECREF(v);
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return;
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finally:
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Py_FatalError("can't initialize math module");
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}
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