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/*
  regerror.c - POSIX regerror() implementation for TRE.

  Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>.

  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 St, Fifth Floor, Boston, MA  02110-1301  USA

*/

#include <string.h>
#include <regex.h>

/* Error message strings for error codes listed in `regex.h'.  This list
   needs to be in sync with the codes listed there, naturally. */

/* Converted to single string by Rich Felker to remove the need for
 * data relocations at runtime, 27 Feb 2006. */

static const char tre_error_messages[] = {
  "No error\0"
  "No match\0"
  "Invalid regexp\0"
  "Unknown collating element\0"
  "Unknown character class name\0"
  "Trailing backslash\0"
  "Invalid back reference\0"
  "Missing ']'\0"
  "Missing ')'\0"
  "Missing '}'\0"
  "Invalid contents of {}\0"
  "Invalid character range\0"
  "Out of memory\0"
  "XXX\0"
};

size_t
regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
{
  const char *err;
  size_t err_len;

  if (errcode >= 0 && errcode <= REG_BADRPT)
    for (err=tre_error_messages; errcode; errcode--, err+=strlen(err)+1);
  else
    err = "Unknown error";

  err_len = strlen(err) + 1;
  if (errbuf_size > 0 && errbuf != NULL)
    {
      if (err_len > errbuf_size)
	{
	  memcpy(errbuf, err, errbuf_size - 1);
	  errbuf[errbuf_size - 1] = '\0';
	}
      else
	{
	  strcpy(errbuf, err);
	}
    }
  return err_len;
}

/* EOF */