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/*
* error.c - libpskc error handling helpers.
* Copyright (C) 2012-2015 Simon Josefsson
*
* This library 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 2.1 of
* the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <config.h>
#include <pskc/pskc.h>
#include "internal.h"
#define ERR(name, desc) { name, #name, desc }
typedef struct
{
int rc;
const char *name;
const char *description;
} err_t;
static const err_t errors[] = {
ERR (PSKC_OK, "success"),
ERR (PSKC_MALLOC_ERROR, "memory allocation failed"),
ERR (PSKC_XML_ERROR, "error returned from XML library"),
ERR (PSKC_PARSE_ERROR, "error parsing PSKC data"),
ERR (PSKC_BASE64_ERROR, "error base64 decoding data"),
ERR (PSKC_UNKNOWN_OUTPUT_FORMAT, "unknown output format"),
ERR (PSKC_XMLSEC_ERROR, "error returned from XMLSec library")
};
/**
* pskc_strerror:
* @err: error code, a #pskc_rc value.
*
* Convert return code to human readable string explanation of the
* reason for the particular error code.
*
* This string can be used to output a diagnostic message to the user.
*
* This function is one of few in the library that can be used without
* a successful call to pskc_init().
*
* Return value: Returns a pointer to a statically allocated string
* containing an explanation of the error code @err.
**/
const char *
pskc_strerror (int err)
{
static const char *unknown = "Libpskc unknown error";
const char *p;
if (-err < 0 || -err >= (int) (sizeof (errors) / sizeof (errors[0])))
{
_pskc_debug ("out of range error code %d", err);
return unknown;
}
p = errors[-err].description;
if (!p)
{
_pskc_debug ("missing description field for error code %d", err);
p = unknown;
}
return p;
}
/**
* pskc_strerror_name:
* @err: error code, a #pskc_rc value.
*
* Convert return code to human readable string representing the error
* code symbol itself. For example, pskc_strerror_name(%PSKC_OK)
* returns the string "PSKC_OK".
*
* This string can be used to output a diagnostic message to the user.
*
* This function is one of few in the library that can be used without
* a successful call to pskc_init().
*
* Return value: Returns a pointer to a statically allocated string
* containing a string version of the error code @err, or NULL if
* the error code is not known.
**/
const char *
pskc_strerror_name (int err)
{
if (-err < 0 || -err >= (int) (sizeof (errors) / sizeof (errors[0])))
{
_pskc_debug ("attempted naming out of range error code %d", err);
return NULL;
}
return errors[-err].name;
}
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