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error.c
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/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 2006-2023 Tamas Nepusz <ntamas@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "error.h"
#include "pyhelpers.h"
#include <igraph.h>
/** \ingroup python_interface_errors
* \brief Exception type to be returned when an internal \c igraph error occurs.
*/
PyObject* igraphmodule_InternalError;
/**
* \ingroup python_interface_errors
* \brief Generic error handler for internal \c igraph errors.
*
* Since now \c igraph supports error handler functions, a special
* function called \c igraphmodule_igraph_error_hook is responsible
* for providing a meaningful error message. If it fails (or it isn't
* even called), this function will provide a default error message.
*
* \return Always returns \c NULL, and all callers are advised to pass this
* \c NULL value to their callers until it is propagated to the Python
* interpreter.
*/
PyObject* igraphmodule_handle_igraph_error() {
if (!PyErr_Occurred()) {
PyErr_SetString(
igraphmodule_InternalError,
"Internal igraph error. Please contact the author!"
);
}
return NULL;
}
/**
* \ingroup python_interface_errors
* \brief Warning hook for \c igraph
*/
void igraphmodule_igraph_warning_hook(const char *reason, const char *file,
int line) {
char buf[4096];
char end;
size_t len = strlen(reason);
const char* separator = " ";
if (len == 0) {
separator = "";
} else {
end = reason[len - 1];
if (end != '.' && end != '?' && end != '!') {
separator = ". ";
}
}
snprintf(buf, sizeof(buf), "%s%sLocation: %s:%i", reason, separator, file, line);
PY_IGRAPH_WARN(buf);
}
/**
* \ingroup python_interface_errors
* \brief Error hook for \c igraph
*/
void igraphmodule_igraph_error_hook(const char *reason, const char *file,
int line, igraph_error_t igraph_errno) {
char buf[4096];
char* punctuation = "";
PyObject *exc = igraphmodule_InternalError;
if (igraph_errno == IGRAPH_UNIMPLEMENTED)
exc = PyExc_NotImplementedError;
if (igraph_errno == IGRAPH_ENOMEM)
exc = PyExc_MemoryError;
/* add a full stop at the end of the error message for nicer formatting */
if (reason && strlen(reason) > 1) {
char last_char = reason[strlen(reason) - 1];
if (last_char != '.' && last_char != '?' && last_char != '!') {
punctuation = ".";
}
}
snprintf(
buf, sizeof(buf), "Error at %s:%i: %s%s -- %s", file, line, reason,
punctuation, igraph_strerror(igraph_errno)
);
IGRAPH_FINALLY_FREE();
/* make sure we are not masking already thrown exceptions */
if (!PyErr_Occurred())
PyErr_SetString(exc, buf);
}