libsframe/sframe-error.c

   1 /* sframe-error.c - Error messages.
   2
   3    Copyright (C) 2022-2023 Free Software Foundation, Inc.
   4
   5    This file is part of libsframe.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "sframe-api.h"
  21 #include <stddef.h>
  22 #include <string.h>
  23
  24 /* In this file, we want to treat the first item of the SFrame error
  25    macro like subsequent items.  */
  26 #define _SFRAME_FIRST(NAME, VALUE) _SFRAME_ITEM(NAME, VALUE)
  27
  28 /* The error message strings, each in a unique structure member precisely big
  29    enough for that error, plus a str member to access them all as a string
  30    table.  */
  31
  32 static const char *const _sframe_errlist[] = {
  33 #define _SFRAME_ITEM(n, s) s,
  34 _SFRAME_ERRORS
  35 #undef _SFRAME_ITEM
  36 };
  37
  38 const char *
  39 sframe_errmsg (int error)
  40 {
  41   const char *str;
  42
  43   if (error >= SFRAME_ERR_BASE && (error - SFRAME_ERR_BASE) < SFRAME_ERR_NERR)
  44     str = _sframe_errlist[error - SFRAME_ERR_BASE];
  45   else
  46     str = (const char *) strerror (error);
  47
  48   return (str ? str : "Unknown error");
  49 }