/*
 * This file contains some public functions
 * usable for both the backend and the frontend.
 * Tatsuo Ishii
 * $Id: common.c,v 1.1 1998/07/24 03:31:56 scrappy Exp $ */

#include <stdio.h>
#include <string.h>

#include "mb/pg_wchar.h"

/*
 * convert encoding char to encoding symbol value.
 * case is ignored.
 * if there's no valid encoding, returns -1
 */
int pg_char_to_encoding(const char *s)
{
  pg_encoding_conv_tbl *p = pg_conv_tbl;

  for(;p->encoding >= 0;p++) {
    if (!strcasecmp(s, p->name)) {
      break;
    }
  }
  return(p->encoding);
}

/*
 * check to see if encoding name is valid
 */
int pg_valid_client_encoding(const char *name)
{
  return(pg_char_to_encoding(name));
}

/*
 * find encoding table entry by encoding
 */
pg_encoding_conv_tbl *pg_get_encent_by_encoding(int encoding)
{
  pg_encoding_conv_tbl *p = pg_conv_tbl;
  for(;p->encoding >= 0;p++) {
    if (p->encoding == encoding) {
      return(p);
    }
  }
  return(0);
}

/*
 * convert encoding symbol to encoding char.
 * if there's no valid encoding symbol, returns ""
 */
const char *pg_encoding_to_char(int encoding)
{
  pg_encoding_conv_tbl *p = pg_get_encent_by_encoding(encoding);

  if (!p) return("");
  return(p->name);
}

/* returns the byte length of a multi-byte word for an encoding */
int pg_encoding_mblen(int encoding, const unsigned char *mbstr)
{
  return((*pg_wchar_table[encoding].mblen)(mbstr));
}