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/*
* This file contains some public functions
* usable for both the backend and the frontend.
* Tatsuo Ishii
* $Id: common.c,v 1.7 1999/07/19 06:25:38 momjian Exp $ */
#include <stdlib.h>
#include <string.h>
#ifdef WIN32
#include "win32.h"
#else
#include <unistd.h>
#endif
#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;
if (!s)
return (-1);
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));
}
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