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/*
* This file is part of LibNSLayout
* Licensed under the ISC License, http://opensource.org/licenses/ISC
* Copyright 2015 Michael Drake <tlsa@netsurf-browser.org>
*/
/** \file include/libnslayout/error.h
* Layout object handling
*/
#ifndef nsl_error_h_
#define nsl_error_h_
#ifdef __cplusplus
extern "C"
{
#endif
/**
* Number of bits in an `nsl_error` that indicate the source of the error.
*/
#define NSL_ERROR_PROV 8
/**
* Libnslayout return codes
*
* NSL_OK indicates no error.
*/
typedef enum nsl_error {
/** No error code */
NSL_OK = 0,
/** Error provenance (bits 0..7) */
NSL_NSLAYOUT = (1 << 0),
NSL_LIBDOM = (1 << 1),
NSL_LIBCSS = (1 << 2),
/** LibNSLayout errors (bits 8..31) */
NSL_NO_MEM = (1 << NSL_ERROR_PROV) | NSL_NSLAYOUT,
} nsl_error;
/**
* Get error provenance.
*
* \param[in] err Error code to test
* \return error provenance
*/
static inline nsl_error nsl_error_provenance(nsl_error err)
{
return err & ((1 << NSL_ERROR_PROV) - 1);
}
/**
* Check if error is from libnslayout
*
* \param[in] err Error code to test
* \return true iff error is from libnslayout
*/
static inline bool nsl_error_is_layout(nsl_error err)
{
return err & NSL_NSLAYOUT;
}
/**
* Check if error is from libdom
*
* \param[in] err Error code to test
* \return true iff error is from libdom
*/
static inline bool nsl_error_is_libdom(nsl_error err)
{
return err & NSL_LIBDOM;
}
/**
* Check if error is from libcss
*
* \param[in] err Error code to test
* \return true iff error is from libcss
*/
static inline bool nsl_error_is_libcss(nsl_error err)
{
return err & NSL_LIBCSS;
}
/**
* Turn libnslayout return code into libnslayout error
*
* \param[in] err Error code to convert
* \return libnslayout error
*/
static inline nsl_error nsl_error_to_layout(nsl_error err)
{
return err;
}
/**
* Turn libnslayout return code into libdom error
*
* \param[in] err Error code to convert
* \return dom exception
*/
static inline dom_exception nsl_error_to_libdom(nsl_error err)
{
return err >> 8;
}
/**
* Turn libnslayout return code into libcss error
*
* \param[in] err Error code to convert
* \return libcss error
*/
static inline css_error nsl_error_to_libcss(nsl_error err)
{
return err >> 8;
}
#ifdef __cplusplus
}
#endif
#endif
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