/* strerror-idna.c --- Convert IDNA errors into text.
 * Copyright (C) 2004, 2005, 2006, 2007  Simon Josefsson
 *
 * This file is part of GNU Libidn.
 *
 * GNU Libidn 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.
 *
 * GNU Libidn 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 GNU Libidn; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 *
 */

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include "idna.h"

#include "gettext.h"
#define _(String) dgettext (PACKAGE, String)

/**
 * idna_strerror - return string describing idna error code
 * @rc: an #Idna_rc return code.
 *
 * Convert a return code integer to a text string.  This string can be
 * used to output a diagnostic message to the user.
 *
 * IDNA_SUCCESS: Successful operation.  This value is guaranteed to
 *   always be zero, the remaining ones are only guaranteed to hold
 *   non-zero values, for logical comparison purposes.
 * IDNA_STRINGPREP_ERROR:  Error during string preparation.
 * IDNA_PUNYCODE_ERROR: Error during punycode operation.
 * IDNA_CONTAINS_NON_LDH: For IDNA_USE_STD3_ASCII_RULES, indicate that
 *   the string contains non-LDH ASCII characters.
 * IDNA_CONTAINS_MINUS: For IDNA_USE_STD3_ASCII_RULES, indicate that
 *   the string contains a leading or trailing hyphen-minus (U+002D).
 * IDNA_INVALID_LENGTH: The final output string is not within the
 *   (inclusive) range 1 to 63 characters.
 * IDNA_NO_ACE_PREFIX: The string does not contain the ACE prefix
 *   (for ToUnicode).
 * IDNA_ROUNDTRIP_VERIFY_ERROR: The ToASCII operation on output
 *   string does not equal the input.
 * IDNA_CONTAINS_ACE_PREFIX: The input contains the ACE prefix (for
 *   ToASCII).
 * IDNA_ICONV_ERROR: Could not convert string in locale encoding.
 * IDNA_MALLOC_ERROR: Could not allocate buffer (this is typically a
 *   fatal error).
 * IDNA_DLOPEN_ERROR: Could not dlopen the libcidn DSO (only used
 *   internally in libc).
 *
 * Return value: Returns a pointer to a statically allocated string
 * containing a description of the error with the return code @rc.
 **/
const char *
idna_strerror (Idna_rc rc)
{
  const char *p;

  bindtextdomain (PACKAGE, LOCALEDIR);

  switch (rc)
    {
    case IDNA_SUCCESS:
      p = _("Success");
      break;

    case IDNA_STRINGPREP_ERROR:
      p = _("String preparation failed");
      break;

    case IDNA_PUNYCODE_ERROR:
      p = _("Punycode failed");
      break;

    case IDNA_CONTAINS_NON_LDH:
      p = _("Non-digit/letter/hyphen in input");
      break;

    case IDNA_CONTAINS_MINUS:
      p = _("Forbidden leading or trailing minus sign (`-')");
      break;

    case IDNA_INVALID_LENGTH:
      p = _("Output would be too large or too small");
      break;

    case IDNA_NO_ACE_PREFIX:
      p = _("Input does not start with ACE prefix (`xn--')");
      break;

    case IDNA_ROUNDTRIP_VERIFY_ERROR:
      p = _("String not idempotent under ToASCII");
      break;

    case IDNA_CONTAINS_ACE_PREFIX:
      p = _("Input already contain ACE prefix (`xn--')");
      break;

    case IDNA_ICONV_ERROR:
      p = _("System iconv failed");
      break;

    case IDNA_MALLOC_ERROR:
      p = _("Cannot allocate memory");
      break;

    case IDNA_DLOPEN_ERROR:
      p = _("System dlopen failed");
      break;

    default:
      p = _("Unknown error");
      break;
    }

  return p;
}