// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
// Distributed under the Apache Software License, Version 2.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.apache.org/licenses/LICENSE-2.0)
// Official repository: https://github.com/ne-foss-org/neboot

#include <libfdt/libfdt.h>
#include <libfdt/libfdt_env.h>

/***********************************************************************************/
/*	@brief FDT error reporting system        									   */
/***********************************************************************************/

/// @brief Error information structure.
struct fdt_err {
  const char* e_str;
};

#define fdt_error(VAL) \
  [(VAL)] = {          \
      .e_str = #VAL,   \
  }

static struct fdt_err nb_fdtErrTbl[] = {
    fdt_error(FDT_ERR_NOTFOUND),     fdt_error(FDT_ERR_EXISTS),    fdt_error(FDT_ERR_NOSPACE),

    fdt_error(FDT_ERR_BADOFFSET),    fdt_error(FDT_ERR_BADPATH),   fdt_error(FDT_ERR_BADPHANDLE),
    fdt_error(FDT_ERR_BADSTATE),

    fdt_error(FDT_ERR_TRUNCATED),    fdt_error(FDT_ERR_BADMAGIC),  fdt_error(FDT_ERR_BADVERSION),
    fdt_error(FDT_ERR_BADSTRUCTURE), fdt_error(FDT_ERR_BADLAYOUT), fdt_error(FDT_ERR_INTERNAL),
    fdt_error(FDT_ERR_BADNCELLS),    fdt_error(FDT_ERR_BADVALUE),  fdt_error(FDT_ERR_BADOVERLAY),
    fdt_error(FDT_ERR_NOPHANDLES),   fdt_error(FDT_ERR_BADFLAGS),  fdt_error(FDT_ERR_ALIGNMENT),
};

#define fdt_error_length() mpux_array_size(nb_fdtErrTbl)

/// @brief Returns the error value as a string.
/// @param errval
/// @return
const char* fdt_strerror(int32_t errval) {
  if (errval > 0) {
    return ("<valid offset/length>");
  } else if (errval == 0) {
    return ("<no error>");
  } else if (-errval < fdt_error_length()) {
    const char* serr = nb_fdtErrTbl[errval].e_str;

    if (serr != null) {
      return serr;
    }
  }

  return ("<unknown error>");
}