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/* utils.c - miscellaneous utility functions
*
* Copyright (C) 2008-2010 Federico Di Gregorio <fog@debian.org>
*
* This file is part of psycopg.
*
* psycopg2 is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* In addition, as a special exception, the copyright holders give
* permission to link this program with the OpenSSL library (or with
* modified versions of OpenSSL that use the same license as OpenSSL),
* and distribute linked combinations including the two.
*
* You must obey the GNU Lesser General Public License in all respects for
* all of the code used other than OpenSSL.
*
* psycopg2 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 Lesser General Public
* License for more details.
*/
#define PSYCOPG_MODULE
#include "psycopg/psycopg.h"
#include "psycopg/connection.h"
#include "psycopg/pgtypes.h"
#include <string.h>
#include <stdlib.h>
char *
psycopg_escape_string(PyObject *obj, const char *from, Py_ssize_t len,
char *to, Py_ssize_t *tolen)
{
Py_ssize_t ql;
connectionObject *conn = (connectionObject*)obj;
int eq = (conn && (conn->equote)) ? 1 : 0;
if (len == 0)
len = strlen(from);
if (to == NULL) {
to = (char *)PyMem_Malloc((len * 2 + 4) * sizeof(char));
if (to == NULL)
return NULL;
}
{
#if PG_VERSION_HEX >= 0x080104
int err;
if (conn && conn->pgconn)
ql = PQescapeStringConn(conn->pgconn, to+eq+1, from, len, &err);
else
#endif
ql = PQescapeString(to+eq+1, from, len);
}
if (eq)
to[0] = 'E';
to[eq] = '\'';
to[ql+eq+1] = '\'';
to[ql+eq+2] = '\0';
if (tolen)
*tolen = ql+eq+2;
return to;
}
/* Escape a string to build a valid PostgreSQL identifier
*
* Allocate a new buffer on the Python heap containing the new string.
* 'len' is optional: if 0 the length is calculated.
*
* The returned string doesn't include quotes.
*
* WARNING: this function is not so safe to allow untrusted input: it does no
* check for multibyte chars. Such a function should be built on
* PQescapeIndentifier, which is only available from PostgreSQL 9.0.
*/
char *
psycopg_escape_identifier_easy(const char *from, Py_ssize_t len)
{
char *rv;
const char *src;
char *dst;
if (!len) { len = strlen(from); }
if (!(rv = PyMem_New(char, 1 + 2 * len))) {
PyErr_NoMemory();
return NULL;
}
/* The only thing to do is double quotes */
for (src = from, dst = rv; *src; ++src, ++dst) {
*dst = *src;
if ('"' == *src) {
*++dst = '"';
}
}
*dst = '\0';
return rv;
}
/* Duplicate a string.
*
* Allocate a new buffer on the Python heap containing the new string.
* 'len' is optional: if 0 the length is calculated.
*
* Store the return in 'to' and return 0 in case of success, else return -1
* and raise an exception.
*/
RAISES_NEG int
psycopg_strdup(char **to, const char *from, Py_ssize_t len)
{
if (!len) { len = strlen(from); }
if (!(*to = PyMem_Malloc(len + 1))) {
PyErr_NoMemory();
return -1;
}
strcpy(*to, from);
return 0;
}
/* Ensure a Python object is a bytes string.
*
* Useful when a char * is required out of it.
*
* The function is ref neutral: steals a ref from obj and adds one to the
* return value. This also means that you shouldn't call the function on a
* borrowed ref, if having the object unallocated is not what you want.
*
* It is safe to call the function on NULL.
*/
STEALS(1) PyObject *
psycopg_ensure_bytes(PyObject *obj)
{
PyObject *rv = NULL;
if (!obj) { return NULL; }
if (PyUnicode_CheckExact(obj)) {
rv = PyUnicode_AsUTF8String(obj);
Py_DECREF(obj);
}
else if (Bytes_CheckExact(obj)) {
rv = obj;
}
else {
PyErr_Format(PyExc_TypeError,
"Expected bytes or unicode string, got %s instead",
Py_TYPE(obj)->tp_name);
Py_DECREF(obj); /* steal the ref anyway */
}
return rv;
}
/* Take a Python object and return text from it.
*
* On Py3 this means converting bytes to unicode. On Py2 bytes are fine.
*
* The function is ref neutral: steals a ref from obj and adds one to the
* return value. It is safe to call it on NULL.
*/
STEALS(1) PyObject *
psycopg_ensure_text(PyObject *obj)
{
#if PY_MAJOR_VERSION < 3
return obj;
#else
if (obj) {
/* bytes to unicode in Py3 */
PyObject *rv = PyUnicode_FromEncodedObject(obj, "utf8", "replace");
Py_DECREF(obj);
return rv;
}
else {
return NULL;
}
#endif
}
/* Check if a file derives from TextIOBase.
*
* Return 1 if it does, else 0, -1 on errors.
*/
int
psycopg_is_text_file(PyObject *f)
{
/* NULL before any call.
* then io.TextIOBase if exists, else None. */
static PyObject *base;
/* Try to import os.TextIOBase */
if (NULL == base) {
PyObject *m;
Dprintf("psycopg_is_text_file: importing io.TextIOBase");
if (!(m = PyImport_ImportModule("io"))) {
Dprintf("psycopg_is_text_file: io module not found");
PyErr_Clear();
Py_INCREF(Py_None);
base = Py_None;
}
else {
if (!(base = PyObject_GetAttrString(m, "TextIOBase"))) {
Dprintf("psycopg_is_text_file: io.TextIOBase not found");
PyErr_Clear();
Py_INCREF(Py_None);
base = Py_None;
}
}
Py_XDECREF(m);
}
if (base != Py_None) {
return PyObject_IsInstance(f, base);
} else {
return 0;
}
}
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