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utils.c
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/*
* Copyright 2010-2025 The pygit2 contributors
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "error.h"
#include "utils.h"
extern PyTypeObject ReferenceType;
extern PyTypeObject TreeType;
extern PyTypeObject CommitType;
extern PyTypeObject BlobType;
extern PyTypeObject TagType;
/**
* Attempt to convert a C string to a Python string with the given encoding.
* If the conversion fails, return a fallback string.
*/
PyObject *
to_unicode_safe(const char *value, const char *encoding)
{
PyObject *py_str;
if (!value) {
py_str = PyUnicode_FromString("None");
} else {
py_str = to_unicode(value, encoding, "replace");
if (!py_str) {
assert(PyErr_Occurred());
py_str = PyUnicode_FromString("(error)");
PyErr_Clear();
}
}
assert(!PyErr_Occurred());
assert(py_str);
return py_str;
}
char*
pgit_borrow_fsdefault(PyObject *value, PyObject **tvalue)
{
PyObject *str = PyOS_FSPath(value);
if (str == NULL) {
return NULL;
}
PyObject *bytes = PyUnicode_EncodeFSDefault(str);
if (bytes == NULL) {
return NULL;
}
*tvalue = bytes;
return PyBytes_AS_STRING(bytes);
}
/**
* Return a pointer to the underlying C string in 'value'. The pointer is
* guaranteed by 'tvalue', decrease its refcount when done with the string.
*/
const char*
pgit_borrow_encoding(PyObject *value, const char *encoding, const char *errors, PyObject **tvalue)
{
PyObject *py_value = NULL;
PyObject *py_str = NULL;
py_value = PyOS_FSPath(value);
if (py_value == NULL) {
Error_type_error("unexpected %.200s", value);
return NULL;
}
// Get new PyBytes reference from value
if (PyUnicode_Check(py_value)) { // Text string
py_str = PyUnicode_AsEncodedString(
py_value,
encoding ? encoding : "utf-8",
errors ? errors : "strict"
);
Py_DECREF(py_value);
if (py_str == NULL)
return NULL;
} else if (PyBytes_Check(py_value)) { // Byte string
py_str = py_value;
} else { // Type error
Error_type_error("unexpected %.200s", value);
Py_DECREF(py_value);
return NULL;
}
// Borrow c string from the new PyBytes reference
char *c_str = PyBytes_AsString(py_str);
if (c_str == NULL) {
Py_DECREF(py_str);
return NULL;
}
// Return the borrowed c string and the new PyBytes reference
*tvalue = py_str;
return c_str;
}
/**
* Return a borrowed c string with the representation of the given Unicode or
* Bytes object:
* - If value is Unicode return the UTF-8 representation
* - If value is Bytes return the raw sttring
* In both cases the returned string is owned by value and must not be
* modified, nor freed.
*/
const char*
pgit_borrow(PyObject *value)
{
if (PyUnicode_Check(value)) { // Text string
return PyUnicode_AsUTF8(value);
} else if (PyBytes_Check(value)) { // Byte string
return PyBytes_AsString(value);
}
// Type error
Error_type_error("unexpected %.200s", value);
return NULL;
}
static git_otype
py_type_to_git_type(PyTypeObject *py_type)
{
if (py_type == &CommitType)
return GIT_OBJECT_COMMIT;
else if (py_type == &TreeType)
return GIT_OBJECT_TREE;
else if (py_type == &BlobType)
return GIT_OBJECT_BLOB;
else if (py_type == &TagType)
return GIT_OBJECT_TAG;
PyErr_SetString(PyExc_ValueError, "invalid target type");
return GIT_OBJECT_INVALID; /* -1 */
}
git_otype
py_object_to_otype(PyObject *py_type)
{
long value;
if (py_type == Py_None)
return GIT_OBJECT_ANY;
if (PyLong_Check(py_type)) {
value = PyLong_AsLong(py_type);
if (value == -1 && PyErr_Occurred())
return GIT_OBJECT_INVALID;
/* TODO Check whether the value is a valid value */
return (git_otype)value;
}
if (PyType_Check(py_type))
return py_type_to_git_type((PyTypeObject *) py_type);
PyErr_SetString(PyExc_ValueError, "invalid target type");
return GIT_OBJECT_INVALID; /* -1 */
}
/**
* Convert an integer to a reference to an IntEnum or IntFlag in pygit2.enums.
*/
PyObject *
pygit2_enum(PyObject *enum_type, int value)
{
if (!enum_type) {
PyErr_SetString(PyExc_TypeError, "an enum has not been cached in _pygit2.cache_enums()");
return NULL;
}
PyObject *enum_instance = PyObject_CallFunction(enum_type, "(i)", value);
return enum_instance;
}