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/*-------------------------------------------------------------------------
*
* ts_locale.c
* locale compatibility layer for tsearch
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tsearch/ts_locale.c,v 1.9 2008/06/18 18:42:54 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "tsearch/ts_locale.h"
#include "tsearch/ts_public.h"
#ifdef USE_WIDE_UPPER_LOWER
int
t_isdigit(const char *ptr)
{
int clen = pg_mblen(ptr);
wchar_t character[2];
if (clen == 1 || lc_ctype_is_c())
return isdigit(TOUCHAR(ptr));
char2wchar(character, 2, ptr, clen);
return iswdigit((wint_t) character[0]);
}
int
t_isspace(const char *ptr)
{
int clen = pg_mblen(ptr);
wchar_t character[2];
if (clen == 1 || lc_ctype_is_c())
return isspace(TOUCHAR(ptr));
char2wchar(character, 2, ptr, clen);
return iswspace((wint_t) character[0]);
}
int
t_isalpha(const char *ptr)
{
int clen = pg_mblen(ptr);
wchar_t character[2];
if (clen == 1 || lc_ctype_is_c())
return isalpha(TOUCHAR(ptr));
char2wchar(character, 2, ptr, clen);
return iswalpha((wint_t) character[0]);
}
int
t_isprint(const char *ptr)
{
int clen = pg_mblen(ptr);
wchar_t character[2];
if (clen == 1 || lc_ctype_is_c())
return isprint(TOUCHAR(ptr));
char2wchar(character, 2, ptr, clen);
return iswprint((wint_t) character[0]);
}
#endif /* USE_WIDE_UPPER_LOWER */
/*
* Read the next line from a tsearch data file (expected to be in UTF-8), and
* convert it to database encoding if needed. The returned string is palloc'd.
* NULL return means EOF.
*/
char *
t_readline(FILE *fp)
{
int len;
char *recoded;
char buf[4096]; /* lines must not be longer than this */
if (fgets(buf, sizeof(buf), fp) == NULL)
return NULL;
len = strlen(buf);
/* Make sure the input is valid UTF-8 */
(void) pg_verify_mbstr(PG_UTF8, buf, len, false);
/* And convert */
recoded = (char *) pg_do_encoding_conversion((unsigned char *) buf,
len,
PG_UTF8,
GetDatabaseEncoding());
if (recoded == NULL) /* should not happen */
elog(ERROR, "encoding conversion failed");
if (recoded == buf)
{
/*
* conversion didn't pstrdup, so we must. We can use the length of the
* original string, because no conversion was done.
*/
recoded = pnstrdup(recoded, len);
}
return recoded;
}
/*
* lowerstr --- fold null-terminated string to lower case
*
* Returned string is palloc'd
*/
char *
lowerstr(const char *str)
{
return lowerstr_with_len(str, strlen(str));
}
/*
* lowerstr_with_len --- fold string to lower case
*
* Input string need not be null-terminated.
*
* Returned string is palloc'd
*/
char *
lowerstr_with_len(const char *str, int len)
{
char *out;
if (len == 0)
return pstrdup("");
#ifdef USE_WIDE_UPPER_LOWER
/*
* Use wide char code only when max encoding length > 1 and ctype != C.
* Some operating systems fail with multi-byte encodings and a C locale.
* Also, for a C locale there is no need to process as multibyte. From
* backend/utils/adt/oracle_compat.c Teodor
*/
if (pg_database_encoding_max_length() > 1 && !lc_ctype_is_c())
{
wchar_t *wstr,
*wptr;
int wlen;
/*
* alloc number of wchar_t for worst case, len contains number of
* bytes >= number of characters and alloc 1 wchar_t for 0, because
* wchar2char wants zero-terminated string
*/
wptr = wstr = (wchar_t *) palloc(sizeof(wchar_t) * (len + 1));
wlen = char2wchar(wstr, len + 1, str, len);
Assert(wlen <= len);
while (*wptr)
{
*wptr = towlower((wint_t) *wptr);
wptr++;
}
/*
* Alloc result string for worst case + '\0'
*/
len = pg_database_encoding_max_length() * wlen + 1;
out = (char *) palloc(len);
wlen = wchar2char(out, wstr, len);
pfree(wstr);
if (wlen < 0)
ereport(ERROR,
(errcode(ERRCODE_CHARACTER_NOT_IN_REPERTOIRE),
errmsg("conversion from wchar_t to server encoding failed: %m")));
Assert(wlen < len);
}
else
#endif /* USE_WIDE_UPPER_LOWER */
{
const char *ptr = str;
char *outptr;
outptr = out = (char *) palloc(sizeof(char) * (len + 1));
while ((ptr - str) < len && *ptr)
{
*outptr++ = tolower(TOUCHAR(ptr));
ptr++;
}
*outptr = '\0';
}
return out;
}
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